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1 | /*#######################################################################################*/ |
1 | /*#######################################################################################*/ |
2 | /* !!! THIS IS NOT FREE SOFTWARE !!! */ |
2 | /* !!! THIS IS NOT FREE SOFTWARE !!! */ |
3 | /*#######################################################################################*/ |
3 | /*#######################################################################################*/ |
4 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
4 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
5 | // + Copyright (c) 2008 Ingo Busker, Holger Buss |
5 | // + Copyright (c) 2008 Ingo Busker, Holger Buss |
6 | // + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY |
6 | // + Nur für den privaten Gebrauch / NON-COMMERCIAL USE ONLY |
7 | // + FOR NON COMMERCIAL USE ONLY |
7 | // + FOR NON COMMERCIAL USE ONLY |
8 | // + www.MikroKopter.com |
8 | // + www.MikroKopter.com |
9 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
9 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
10 | // + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation), |
10 | // + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation), |
11 | // + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist. |
11 | // + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist. |
12 | // + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt |
12 | // + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt |
13 | // + bzgl. der Nutzungsbedingungen aufzunehmen. |
13 | // + bzgl. der Nutzungsbedingungen aufzunehmen. |
14 | // + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen, |
14 | // + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen, |
15 | // + Verkauf von Luftbildaufnahmen, usw. |
15 | // + Verkauf von Luftbildaufnahmen, usw. |
16 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
16 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
17 | // + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht, |
17 | // + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht, |
18 | // + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen |
18 | // + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen |
19 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
19 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
20 | // + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts |
20 | // + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts |
21 | // + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de" |
21 | // + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de" |
22 | // + eindeutig als Ursprung verlinkt werden |
22 | // + eindeutig als Ursprung verlinkt werden |
23 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
23 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
24 | // + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion |
24 | // + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion |
25 | // + Benutzung auf eigene Gefahr |
25 | // + Benutzung auf eigene Gefahr |
26 | // + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden |
26 | // + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden |
27 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
27 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
28 | // + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur |
28 | // + Die Portierung oder Nutzung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur |
29 | // + mit unserer Zustimmung zulässig |
29 | // + mit unserer Zustimmung zulässig |
30 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
30 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
31 | // + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen |
31 | // + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen |
32 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
32 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
33 | // + Redistributions of source code (with or without modifications) must retain the above copyright notice, |
33 | // + Redistributions of source code (with or without modifications) must retain the above copyright notice, |
34 | // + this list of conditions and the following disclaimer. |
34 | // + this list of conditions and the following disclaimer. |
35 | // + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived |
35 | // + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived |
36 | // + from this software without specific prior written permission. |
36 | // + from this software without specific prior written permission. |
37 | // + * The use of this project (hardware, software, binary files, sources and documentation) is only permitted |
37 | // + * The use of this project (hardware, software, binary files, sources and documentation) is only permitted |
38 | // + for non-commercial use (directly or indirectly) |
38 | // + for non-commercial use (directly or indirectly) |
39 | // + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted |
39 | // + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted |
40 | // + with our written permission |
40 | // + with our written permission |
41 | // + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be |
41 | // + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be |
42 | // + clearly linked as origin |
42 | // + clearly linked as origin |
43 | // + * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed |
43 | // + * porting the sources to other systems or using the software on other systems (except hardware from www.mikrokopter.de) is not allowed |
44 | // |
44 | // |
45 | // + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
45 | // + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
46 | // + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
46 | // + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
47 | // + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
47 | // + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
48 | // + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
48 | // + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
49 | // + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
49 | // + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
50 | // + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
50 | // + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
51 | // + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
51 | // + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
52 | // + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
52 | // + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
53 | // + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
53 | // + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
54 | // + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
54 | // + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
55 | // + POSSIBILITY OF SUCH DAMAGE. |
55 | // + POSSIBILITY OF SUCH DAMAGE. |
56 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
56 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
57 | #include <stdio.h> |
57 | #include <stdio.h> |
58 | #include "91x_lib.h" |
58 | #include "91x_lib.h" |
59 | #include "timer1.h" |
59 | #include "timer1.h" |
60 | #include "fat16.h" |
60 | #include "fat16.h" |
61 | #include "sdc.h" |
61 | #include "sdc.h" |
62 | #include "uart1.h" |
62 | #include "uart1.h" |
63 | 63 | ||
64 | //________________________________________________________________________________________________________________________________________ |
64 | //________________________________________________________________________________________________________________________________________ |
65 | // Module name: fat16.c |
65 | // Module name: fat16.c |
66 | // Compiler used: avr-gcc 3.4.5 |
66 | // Compiler used: avr-gcc 3.4.5 |
67 | // Last Modifikation: 20.03.2010 |
67 | // Last Modifikation: 20.03.2010 |
68 | // Version: 2.10 |
68 | // Version: 2.10 |
69 | // Authors: Stephan Busker & Gregor Stobrawa |
69 | // Authors: Stephan Busker & Gregor Stobrawa |
70 | // Description: Source files for FAT16 implementation with read and write-access |
70 | // Description: Source files for FAT16 implementation with read and write-access |
71 | // Copyright (C) 2008 Stephan Busker & Gregor Stobrawa |
71 | // Copyright (C) 2008 Stephan Busker & Gregor Stobrawa |
72 | //........................................................................................................................................ |
72 | //........................................................................................................................................ |
73 | // Functions: extern s16 Fat16_Init(void); |
73 | // Functions: extern s16 Fat16_Init(void); |
74 | // extern s16 Fat16_Deinit(void); |
74 | // extern s16 Fat16_Deinit(void); |
75 | // extern s8* FAT16_GetVolumeLabel(void); |
75 | // extern s8* FAT16_GetVolumeLabel(void); |
76 | // extern File_t * fopen_(const u8 *filename, const s8 mode); |
76 | // extern File_t * fopen_(const u8 *filename, const s8 mode); |
77 | // extern s16 fclose_(File_t *File); |
77 | // extern s16 fclose_(File_t *File); |
78 | // extern u8 fexist_(s8 * const filename); |
78 | // extern u8 fexist_(s8 * const filename); |
79 | // extern s16 fflush_(File_t *File); |
79 | // extern s16 fflush_(File_t *File); |
80 | // extern s16 fseek_(File_t *File, s32 offset, s16 origin); |
80 | // extern s16 fseek_(File_t *File, s32 offset, s16 origin); |
81 | // extern s16 fgetc_(File_t *File); |
81 | // extern s16 fgetc_(File_t *File); |
82 | // extern s16 fputc_(u8 c, File_t *File); |
82 | // extern s16 fputc_(u8 c, File_t *File); |
83 | // extern u32 fread_(void *buffer, u32 size, u32 count, File_t *File); |
83 | // extern u32 fread_(void *buffer, u32 size, u32 count, File_t *File); |
84 | // extern u32 fwrite_(void *buffer, u32 size, u32 count, File_t *File); |
84 | // extern u32 fwrite_(void *buffer, u32 size, u32 count, File_t *File); |
85 | // extern s16 fputs_(const u8 *string, File_t *File); |
85 | // extern s16 fputs_(const u8 *string, File_t *File); |
86 | // extern u8 * fgets_(u8 *string, s16 length, File_t *File); |
86 | // extern u8 * fgets_(u8 *string, s16 length, File_t *File); |
87 | // extern u8 feof_(File_t * const file); |
87 | // extern u8 feof_(File_t * const file); |
88 | //........................................................................................................................................ |
88 | //........................................................................................................................................ |
89 | // ext. functions: extern SD_Result_t SDC_Init(void;) |
89 | // ext. functions: extern SD_Result_t SDC_Init(void;) |
90 | // extern SD_Result_t SDC_Deinit(void); |
90 | // extern SD_Result_t SDC_Deinit(void); |
91 | // extern SD_Result_t SDC_GetSector (u32,u8 *); |
91 | // extern SD_Result_t SDC_GetSector (u32,u8 *); |
92 | // extern SD_Result_t SDC_PutSector (u32,u8 *); |
92 | // extern SD_Result_t SDC_PutSector (u32,u8 *); |
93 | //........................................................................................................................................ |
93 | //........................................................................................................................................ |
94 | // |
94 | // |
95 | // URL: www.Mikro-Control.de |
95 | // URL: www.Mikro-Control.de |
96 | // mailto: stephan.busker@mikro-control.de |
96 | // mailto: stephan.busker@mikro-control.de |
97 | //________________________________________________________________________________________________________________________________________ |
97 | //________________________________________________________________________________________________________________________________________ |
98 | 98 | ||
99 | /* |
99 | /* |
100 | FAT16 Drive Layout: |
100 | FAT16 Drive Layout: |
101 | Description Offset |
101 | Description Offset |
102 | Volume Boot Sector Start of Partition |
102 | Volume Boot Sector Start of Partition |
103 | Fat Tables Start + # of Reserved Sectors |
103 | Fat Tables Start + # of Reserved Sectors |
104 | Root Directory Entry Start + # of Reserved + (# of Sectors Per FAT * 2) |
104 | Root Directory Entry Start + # of Reserved + (# of Sectors Per FAT * 2) |
105 | Data Area (Starts with Cluster #2) Start + # of Reserved + (# of Sectors Per FAT * 2) + ((Maximum Root Directory Entries * 32) / Bytes per Sector) |
105 | Data Area (Starts with Cluster #2) Start + # of Reserved + (# of Sectors Per FAT * 2) + ((Maximum Root Directory Entries * 32) / Bytes per Sector) |
106 | */ |
106 | */ |
107 | 107 | ||
108 | 108 | ||
109 | /* |
109 | /* |
110 | ________________________________________________________________________________________________________________________________________ |
110 | ________________________________________________________________________________________________________________________________________ |
111 | 111 | ||
112 | Structure of an partition entry |
112 | Structure of an partition entry |
113 | ________________________________________________________________________________________________________________________________________ |
113 | ________________________________________________________________________________________________________________________________________ |
114 | 114 | ||
115 | Partition Entry is 16 bytes long |
115 | Partition Entry is 16 bytes long |
116 | */ |
116 | */ |
117 | typedef struct |
117 | typedef struct |
118 | { |
118 | { |
119 | u8 PartitionState; // Current State of Partition (00h=Inactive, 80h=Active) |
119 | u8 PartitionState; // Current State of Partition (00h=Inactive, 80h=Active) |
120 | u8 BeginningHead; // Beginning of Partition - Head |
120 | u8 BeginningHead; // Beginning of Partition - Head |
121 | u16 BeginningCylSec; // Beginning of Partition - Cylinder/Sector (See Below) |
121 | u16 BeginningCylSec; // Beginning of Partition - Cylinder/Sector (See Below) |
122 | u8 Type; // Type of Partition (See List Below) |
122 | u8 Type; // Type of Partition (See List Below) |
123 | u8 EndHead; // End of Partition - Head |
123 | u8 EndHead; // End of Partition - Head |
124 | u16 EndCylSec; // End of Partition - Cylinder/Sector |
124 | u16 EndCylSec; // End of Partition - Cylinder/Sector |
125 | u32 NoSectorsBeforePartition; // Number of Sectors between the MBR and the First Sector in the Partition |
125 | u32 NoSectorsBeforePartition; // Number of Sectors between the MBR and the First Sector in the Partition |
126 | u32 NoSectorsPartition ; // Number of Sectors in the Partition |
126 | u32 NoSectorsPartition ; // Number of Sectors in the Partition |
127 | } __attribute__((packed)) PartitionEntry_t; |
127 | } __attribute__((packed)) PartitionEntry_t; |
128 | 128 | ||
129 | /* |
129 | /* |
130 | Coding of Cylinder/Sector words |
130 | Coding of Cylinder/Sector words |
131 | 131 | ||
132 | Cylinder is 10 bits: [7:0] at [15:8] and [9:8] at [7:6] |
132 | Cylinder is 10 bits: [7:0] at [15:8] and [9:8] at [7:6] |
133 | Sector is 5 bits: [5:0] at [5:0] |
133 | Sector is 5 bits: [5:0] at [5:0] |
134 | */ |
134 | */ |
135 | 135 | ||
136 | // Partition Types: |
136 | // Partition Types: |
137 | #define PART_TYPE_UNKNOWN 0x00 |
137 | #define PART_TYPE_UNKNOWN 0x00 |
138 | #define PART_TYPE_FAT12 0x01 |
138 | #define PART_TYPE_FAT12 0x01 |
139 | #define PART_TYPE_XENIX 0x02 |
139 | #define PART_TYPE_XENIX 0x02 |
140 | #define PART_TYPE_FAT16_ST_32_MB 0x04 |
140 | #define PART_TYPE_FAT16_ST_32_MB 0x04 |
141 | #define PART_TYPE_EXTDOS 0x05 |
141 | #define PART_TYPE_EXTDOS 0x05 |
142 | #define PART_TYPE_FAT16_LT_32_MB 0x06 |
142 | #define PART_TYPE_FAT16_LT_32_MB 0x06 |
143 | #define PART_TYPE_NTFS 0x07 |
143 | #define PART_TYPE_NTFS 0x07 |
144 | #define PART_TYPE_FAT32 0x0B |
144 | #define PART_TYPE_FAT32 0x0B |
145 | #define PART_TYPE_FAT32LBA 0x0C |
145 | #define PART_TYPE_FAT32LBA 0x0C |
146 | #define PART_TYPE_FAT16LBA 0x0E |
146 | #define PART_TYPE_FAT16LBA 0x0E |
147 | #define PART_TYPE_EXTDOSLBA 0x0F |
147 | #define PART_TYPE_EXTDOSLBA 0x0F |
148 | #define PART_TYPE_EISA 0x12 |
148 | #define PART_TYPE_EISA 0x12 |
149 | #define PART_TYPE_ONTRACK 0x33 |
149 | #define PART_TYPE_ONTRACK 0x33 |
150 | #define PART_TYPE_NOVELL 0x40 |
150 | #define PART_TYPE_NOVELL 0x40 |
151 | #define PART_TYPE_DYNAMIC 0x42 |
151 | #define PART_TYPE_DYNAMIC 0x42 |
152 | #define PART_TYPE_PCIX 0x4B |
152 | #define PART_TYPE_PCIX 0x4B |
153 | #define PART_TYPE_LINUX_SWAP 0x82 |
153 | #define PART_TYPE_LINUX_SWAP 0x82 |
154 | #define PART_TYPE_LINUX_NATIVE 0x83 |
154 | #define PART_TYPE_LINUX_NATIVE 0x83 |
155 | #define PART_TYPE_LINUX_LVM 0x8E |
155 | #define PART_TYPE_LINUX_LVM 0x8E |
156 | #define PART_TYPE_PHOENIXSAVE 0xA0 |
156 | #define PART_TYPE_PHOENIXSAVE 0xA0 |
157 | #define PART_TYPE_FREEBSD 0xA5 |
157 | #define PART_TYPE_FREEBSD 0xA5 |
158 | #define PART_TYPE_OPENBSD 0xA6 |
158 | #define PART_TYPE_OPENBSD 0xA6 |
159 | #define PART_TYPE_NETNBSD 0xA9 |
159 | #define PART_TYPE_NETNBSD 0xA9 |
160 | #define PART_TYPE_CPM 0xDB |
160 | #define PART_TYPE_CPM 0xDB |
161 | #define PART_TYPE_DBFS 0xE0 |
161 | #define PART_TYPE_DBFS 0xE0 |
162 | #define PART_TYPE_BBT 0xFF |
162 | #define PART_TYPE_BBT 0xFF |
163 | 163 | ||
164 | 164 | ||
165 | /* |
165 | /* |
166 | ________________________________________________________________________________________________________________________________________ |
166 | ________________________________________________________________________________________________________________________________________ |
167 | 167 | ||
168 | Structure of the MasterBootRecord |
168 | Structure of the MasterBootRecord |
169 | ________________________________________________________________________________________________________________________________________ |
169 | ________________________________________________________________________________________________________________________________________ |
170 | 170 | ||
171 | Master Boot Record is 512 bytes long |
171 | Master Boot Record is 512 bytes long |
172 | The Master Boot Record is the same for pretty much all Operating Systems. |
172 | The Master Boot Record is the same for pretty much all Operating Systems. |
173 | It is located on the first Sector of the Hard Drive, at Cylinder 0, Head 0, Sector 1 |
173 | It is located on the first Sector of the Hard Drive, at Cylinder 0, Head 0, Sector 1 |
174 | */ |
174 | */ |
175 | typedef struct |
175 | typedef struct |
176 | { |
176 | { |
177 | u8 ExecutableCode[446]; // 446 bytes for machine start code |
177 | u8 ExecutableCode[446]; // 446 bytes for machine start code |
178 | PartitionEntry_t PartitionEntry1; // 16 bytes for partition entry 1 |
178 | PartitionEntry_t PartitionEntry1; // 16 bytes for partition entry 1 |
179 | PartitionEntry_t PartitionEntry2; // 16 bytes for partition entry 2 |
179 | PartitionEntry_t PartitionEntry2; // 16 bytes for partition entry 2 |
180 | PartitionEntry_t PartitionEntry3; // 16 bytes for partition entry 3 |
180 | PartitionEntry_t PartitionEntry3; // 16 bytes for partition entry 3 |
181 | PartitionEntry_t PartitionEntry4; // 16 bytes for partition entry 4 |
181 | PartitionEntry_t PartitionEntry4; // 16 bytes for partition entry 4 |
182 | u16 ExecutableMarker; // BIOS-Signature (0x55 0xAA) |
182 | u16 ExecutableMarker; // BIOS-Signature (0x55 0xAA) |
183 | } __attribute__((packed)) MBR_Entry_t; |
183 | } __attribute__((packed)) MBR_Entry_t; |
184 | 184 | ||
185 | 185 | ||
186 | /* |
186 | /* |
187 | ________________________________________________________________________________________________________________________________________ |
187 | ________________________________________________________________________________________________________________________________________ |
188 | 188 | ||
189 | Structure of the VolumeBootRecord |
189 | Structure of the VolumeBootRecord |
190 | ________________________________________________________________________________________________________________________________________ |
190 | ________________________________________________________________________________________________________________________________________ |
191 | 191 | ||
192 | The Volume Boot Record is 512 bytes long |
192 | The Volume Boot Record is 512 bytes long |
193 | This information is located in the first sector of every partition. |
193 | This information is located in the first sector of every partition. |
194 | */ |
194 | */ |
195 | typedef struct |
195 | typedef struct |
196 | { |
196 | { |
197 | u8 JumpCode[3]; // Jump Code + NOP |
197 | u8 JumpCode[3]; // Jump Code + NOP |
198 | s8 OEMName[8]; // OEM Name |
198 | s8 OEMName[8]; // OEM Name |
199 | u16 BytesPerSector; // Bytes Per Sector |
199 | u16 BytesPerSector; // Bytes Per Sector |
200 | u8 SectorsPerCluster; // Sectors Per Cluster |
200 | u8 SectorsPerCluster; // Sectors Per Cluster |
201 | u16 ReservedSectors; // Reserved Sectors |
201 | u16 ReservedSectors; // Reserved Sectors |
202 | u8 NoFATCopies; // Number of Copies of FAT |
202 | u8 NoFATCopies; // Number of Copies of FAT |
203 | u16 MaxRootEntries; // Maximum Root Directory Entries |
203 | u16 MaxRootEntries; // Maximum Root Directory Entries |
204 | u16 NoSectorsInPartSml32MB; // Number of Sectors in Partition Smaller than 32 MB |
204 | u16 NoSectorsInPartSml32MB; // Number of Sectors in Partition Smaller than 32 MB |
205 | u8 MediaDescriptor; // Media Descriptor (0xF8 for Hard Disks) |
205 | u8 MediaDescriptor; // Media Descriptor (0xF8 for Hard Disks) |
206 | u16 SectorsPerFAT; // Sectors Per FAT |
206 | u16 SectorsPerFAT; // Sectors Per FAT |
207 | u16 SectorsPerTrack; // Sectors Per Track |
207 | u16 SectorsPerTrack; // Sectors Per Track |
208 | u16 NoHeads; // Number of Heads |
208 | u16 NoHeads; // Number of Heads |
209 | u32 NoHiddenSectors; // Number of Hidden Sectors in Partition |
209 | u32 NoHiddenSectors; // Number of Hidden Sectors in Partition |
210 | u32 NoSectors; // Number of Sectors in Partition |
210 | u32 NoSectors; // Number of Sectors in Partition |
211 | u16 DriveNo; // Logical Drive Number of Partition |
211 | u16 DriveNo; // Logical Drive Number of Partition |
212 | u8 ExtendedSig; // Extended Signature (0x29) |
212 | u8 ExtendedSig; // Extended Signature (0x29) |
213 | u32 SerialNo; // Serial Number of the Partition |
213 | u32 SerialNo; // Serial Number of the Partition |
214 | s8 VolumeName[11]; // Volume Name of the Partititon |
214 | s8 VolumeName[11]; // Volume Name of the Partititon |
215 | s8 FATName[8]; // FAT Name (FAT16) |
215 | s8 FATName[8]; // FAT Name (FAT16) |
216 | u8 ExecutableCode[446]; // 446 bytes for machine start code |
216 | u8 ExecutableCode[446]; // 446 bytes for machine start code |
217 | u16 ExecutableMarker; // Executable Marker (0x55 0xAA) |
217 | u16 ExecutableMarker; // Executable Marker (0x55 0xAA) |
218 | } __attribute__((packed)) VBR_Entry_t; |
218 | } __attribute__((packed)) VBR_Entry_t; |
219 | 219 | ||
220 | 220 | ||
221 | 221 | ||
222 | /* |
222 | /* |
223 | ________________________________________________________________________________________________________________________________________ |
223 | ________________________________________________________________________________________________________________________________________ |
224 | 224 | ||
225 | Structure of an directory entry |
225 | Structure of an directory entry |
226 | ________________________________________________________________________________________________________________________________________ |
226 | ________________________________________________________________________________________________________________________________________ |
227 | 227 | ||
228 | Directory entry is 32 bytes. |
228 | Directory entry is 32 bytes. |
229 | */ |
229 | */ |
230 | typedef struct |
230 | typedef struct |
231 | { |
231 | { |
232 | s8 Name[8]; // 8 bytes name, padded with spaces. |
232 | s8 Name[8]; // 8 bytes name, padded with spaces. |
233 | u8 Extension[3]; // 3 bytes extension, padded with spaces. |
233 | u8 Extension[3]; // 3 bytes extension, padded with spaces. |
234 | u8 Attribute; // attribute of the directory entry (unused,archive,read-only,system,directory,volume) |
234 | u8 Attribute; // attribute of the directory entry (unused,archive,read-only,system,directory,volume) |
235 | u8 Res1; // should be zero |
235 | u8 Res1; // should be zero |
236 | u8 CreationTime10ms; // subsecond resolution of creation time |
236 | u8 CreationTime10ms; // subsecond resolution of creation time |
237 | u16 CreationTime; // Time of creation h:m:s |
237 | u16 CreationTime; // Time of creation h:m:s |
238 | u16 CreationDate; // Date of creation Y.M.D |
238 | u16 CreationDate; // Date of creation Y.M.D |
239 | u16 LastAccessDate; // The date where the file was last accessed |
239 | u16 LastAccessDate; // The date where the file was last accessed |
240 | u8 Res2[2]; // should be zero |
240 | u8 Res2[2]; // should be zero |
241 | u16 ModTime; // date of last write access |
241 | u16 ModTime; // date of last write access |
242 | u16 ModDate; // date of last write access to the file or directory. |
242 | u16 ModDate; // date of last write access to the file or directory. |
243 | u16 StartCluster; // first cluster of the file or directory. |
243 | u16 StartCluster; // first cluster of the file or directory. |
244 | u32 Size; // size of the file or directory in bytes. |
244 | u32 Size; // size of the file or directory in bytes. |
245 | } __attribute__((packed)) DirEntry_t; |
245 | } __attribute__((packed)) DirEntry_t; |
246 | 246 | ||
247 | #define SLOT_EMPTY 0x00 // slot has never been used |
247 | #define SLOT_EMPTY 0x00 // slot has never been used |
248 | #define SLOT_E5 0x05 // the real value is 0xe5 |
248 | #define SLOT_E5 0x05 // the real value is 0xe5 |
249 | #define SLOT_DELETED 0xE5 // file in this slot deleted |
249 | #define SLOT_DELETED 0xE5 // file in this slot deleted |
250 | 250 | ||
251 | #define ATTR_NONE 0x00 // normal file |
251 | #define ATTR_NONE 0x00 // normal file |
252 | #define ATTR_READONLY 0x01 // file is readonly |
252 | #define ATTR_READONLY 0x01 // file is readonly |
253 | #define ATTR_HIDDEN 0x02 // file is hidden |
253 | #define ATTR_HIDDEN 0x02 // file is hidden |
254 | #define ATTR_SYSTEM 0x04 // file is a system file |
254 | #define ATTR_SYSTEM 0x04 // file is a system file |
255 | #define ATTR_VOLUMELABEL 0x08 // entry is a volume label |
255 | #define ATTR_VOLUMELABEL 0x08 // entry is a volume label |
256 | #define ATTR_LONG_FILENAME 0x0F // this is a long filename entry |
256 | #define ATTR_LONG_FILENAME 0x0F // this is a long filename entry |
257 | #define ATTR_SUBDIRECTORY 0x10 // entry is a directory name |
257 | #define ATTR_SUBDIRECTORY 0x10 // entry is a directory name |
258 | #define ATTR_ARCHIVE 0x20 // file is new or modified |
258 | #define ATTR_ARCHIVE 0x20 // file is new or modified |
259 | 259 | ||
260 | 260 | ||
261 | /* |
261 | /* |
262 | ________________________________________________________________________________________________________________________________________ |
262 | ________________________________________________________________________________________________________________________________________ |
263 | 263 | ||
264 | Structure of an entry within the fileallocationtable. |
264 | Structure of an entry within the fileallocationtable. |
265 | ________________________________________________________________________________________________________________________________________ |
265 | ________________________________________________________________________________________________________________________________________ |
266 | */ |
266 | */ |
267 | typedef struct |
267 | typedef struct |
268 | { |
268 | { |
269 | u16 NextCluster; // the next cluster of the file. |
269 | u16 NextCluster; // the next cluster of the file. |
270 | } __attribute__((packed)) Fat16Entry_t; |
270 | } __attribute__((packed)) Fat16Entry_t; |
271 | 271 | ||
272 | // secial fat entries |
272 | // secial fat entries |
273 | #define FAT16_CLUSTER_FREE 0x0000 |
273 | #define FAT16_CLUSTER_FREE 0x0000 |
274 | #define FAT16_CLUSTER_RESERVED 0x0001 |
274 | #define FAT16_CLUSTER_RESERVED 0x0001 |
275 | #define FAT16_CLUSTER_USED_MIN 0x0002 |
275 | #define FAT16_CLUSTER_USED_MIN 0x0002 |
276 | #define FAT16_CLUSTER_USED_MAX 0xFFEF |
276 | #define FAT16_CLUSTER_USED_MAX 0xFFEF |
277 | #define FAT16_CLUSTER_ROOTDIR_MIN 0xFFF0 |
277 | #define FAT16_CLUSTER_ROOTDIR_MIN 0xFFF0 |
278 | #define FAT16_CLUSTER_ROOTDIR_MAX 0xFFF6 |
278 | #define FAT16_CLUSTER_ROOTDIR_MAX 0xFFF6 |
279 | #define FAT16_CLUSTER_BAD 0xFFF7 |
279 | #define FAT16_CLUSTER_BAD 0xFFF7 |
280 | #define FAT16_CLUSTER_LAST_MIN 0xFFF8 |
280 | #define FAT16_CLUSTER_LAST_MIN 0xFFF8 |
281 | #define FAT16_CLUSTER_LAST_MAX 0xFFFF |
281 | #define FAT16_CLUSTER_LAST_MAX 0xFFFF |
282 | 282 | ||
283 | /*****************************************************************************************************************************************/ |
283 | /*****************************************************************************************************************************************/ |
284 | /* */ |
284 | /* */ |
285 | /* Global variables needed for read- or write-acces to the FAT16- filesystem. */ |
285 | /* Global variables needed for read- or write-acces to the FAT16- filesystem. */ |
286 | /* */ |
286 | /* */ |
287 | /*****************************************************************************************************************************************/ |
287 | /*****************************************************************************************************************************************/ |
288 | 288 | ||
289 | #define MBR_SECTOR 0x00 // the masterboot record is located in sector 0. |
289 | #define MBR_SECTOR 0x00 // the masterboot record is located in sector 0. |
290 | #define DIRENTRY_SIZE 32 //bytes |
290 | #define DIRENTRY_SIZE 32 //bytes |
291 | #define DIRENTRIES_PER_SECTOR BYTES_PER_SECTOR/DIRENTRY_SIZE |
291 | #define DIRENTRIES_PER_SECTOR BYTES_PER_SECTOR/DIRENTRY_SIZE |
292 | #define FAT16_BYTES 2 |
292 | #define FAT16_BYTES 2 |
293 | #define FAT16_ENTRIES_PER_SECTOR BYTES_PER_SECTOR/FAT16_BYTES |
293 | #define FAT16_ENTRIES_PER_SECTOR BYTES_PER_SECTOR/FAT16_BYTES |
294 | 294 | ||
295 | #define SECTOR_UNDEFINED 0x00000000L |
295 | #define SECTOR_UNDEFINED 0x00000000L |
296 | #define CLUSTER_UNDEFINED 0x0000 |
296 | #define CLUSTER_UNDEFINED 0x0000 |
297 | 297 | ||
298 | #define FSTATE_UNUSED 0 |
298 | #define FSTATE_UNUSED 0 |
299 | #define FSTATE_USED 1 |
299 | #define FSTATE_USED 1 |
300 | 300 | ||
301 | typedef struct |
301 | typedef struct |
302 | { |
302 | { |
303 | u8 IsValid; // 0 means invalid, else valid |
303 | u8 IsValid; // 0 means invalid, else valid |
304 | u8 SectorsPerCluster; // how many sectors does a cluster contain? |
304 | u8 SectorsPerCluster; // how many sectors does a cluster contain? |
305 | u8 FatCopies; // Numbers of copies of the FAT |
305 | u8 FatCopies; // Numbers of copies of the FAT |
306 | u16 MaxRootEntries; // Possible number of entries in the root directory. |
306 | u16 MaxRootEntries; // Possible number of entries in the root directory. |
307 | u16 SectorsPerFat; // how many sectors does a fat16 contain? |
307 | u16 SectorsPerFat; // how many sectors does a fat16 contain? |
308 | u32 FirstFatSector; // sector of the start of the fat |
308 | u32 FirstFatSector; // sector of the start of the fat |
309 | u32 FirstRootDirSector; // sector of the rootdirectory |
309 | u32 FirstRootDirSector; // sector of the rootdirectory |
310 | u32 FirstDataSector; // sector of the first cluster containing data (cluster2). |
310 | u32 FirstDataSector; // sector of the first cluster containing data (cluster2). |
311 | u32 LastDataSector; // the last data sector of the partition |
311 | u32 LastDataSector; // the last data sector of the partition |
312 | u8 VolumeLabel[12]; // the volume label |
312 | u8 VolumeLabel[12]; // the volume label |
313 | } Partition_t; |
313 | } Partition_t; |
314 | 314 | ||
315 | Partition_t Partition; // Structure holds partition information |
315 | Partition_t Partition; // Structure holds partition information |
316 | 316 | ||
317 | File_t FilePointer[FILE_MAX_OPEN]; // Allocate Memmoryspace for each filepointer used. |
317 | File_t FilePointer[FILE_MAX_OPEN]; // Allocate Memmoryspace for each filepointer used. |
318 | 318 | ||
319 | 319 | ||
320 | /****************************************************************************************************************************************/ |
320 | /****************************************************************************************************************************************/ |
321 | /* Function: FileDate(DateTime_t *); */ |
321 | /* Function: FileDate(DateTime_t *); */ |
322 | /* */ |
322 | /* */ |
323 | /* Description: This function calculates the DOS date from a pointer to a time structure. */ |
323 | /* Description: This function calculates the DOS date from a pointer to a time structure. */ |
324 | /* */ |
324 | /* */ |
325 | /* Returnvalue: Returns the DOS date. */ |
325 | /* Returnvalue: Returns the DOS date. */ |
326 | /****************************************************************************************************************************************/ |
326 | /****************************************************************************************************************************************/ |
327 | u16 FileDate(DateTime_t * pTimeStruct) |
327 | u16 FileDate(DateTime_t * pTimeStruct) |
328 | { |
328 | { |
329 | u16 date = 0; |
329 | u16 date = 0; |
330 | if(pTimeStruct == NULL) return date; |
330 | if(pTimeStruct == NULL) return date; |
331 | if(!(pTimeStruct->Valid)) return date; |
331 | if(!(pTimeStruct->Valid)) return date; |
332 | 332 | ||
333 | date |= (0x007F & (u16)(pTimeStruct->Year - 1980))<<9; // set year |
333 | date |= (0x007F & (u16)(pTimeStruct->Year - 1980))<<9; // set year |
334 | date |= (0x000F & (u16)(pTimeStruct->Month))<<5; // set month |
334 | date |= (0x000F & (u16)(pTimeStruct->Month))<<5; // set month |
335 | date |= (0x001F & (u16)(pTimeStruct->Day)); |
335 | date |= (0x001F & (u16)(pTimeStruct->Day)); |
336 | return date; |
336 | return date; |
337 | } |
337 | } |
338 | 338 | ||
339 | /****************************************************************************************************************************************/ |
339 | /****************************************************************************************************************************************/ |
340 | /* Function: FileTime(DateTime_t *); */ |
340 | /* Function: FileTime(DateTime_t *); */ |
341 | /* */ |
341 | /* */ |
342 | /* Description: This function calculates the DOS time from a pointer to a time structure. */ |
342 | /* Description: This function calculates the DOS time from a pointer to a time structure. */ |
343 | /* */ |
343 | /* */ |
344 | /* Returnvalue: Returns the DOS time. */ |
344 | /* Returnvalue: Returns the DOS time. */ |
345 | /****************************************************************************************************************************************/ |
345 | /****************************************************************************************************************************************/ |
346 | 346 | ||
347 | u16 FileTime(DateTime_t * pTimeStruct) |
347 | u16 FileTime(DateTime_t * pTimeStruct) |
348 | { |
348 | { |
349 | u16 time = 0; |
349 | u16 time = 0; |
350 | if(pTimeStruct == NULL) return time; |
350 | if(pTimeStruct == NULL) return time; |
351 | if(!(pTimeStruct->Valid)) return time; |
351 | if(!(pTimeStruct->Valid)) return time; |
352 | 352 | ||
353 | time |= (0x001F & (u16)(pTimeStruct->Hour))<<11; |
353 | time |= (0x001F & (u16)(pTimeStruct->Hour))<<11; |
354 | time |= (0x003F & (u16)(pTimeStruct->Min))<<5; |
354 | time |= (0x003F & (u16)(pTimeStruct->Min))<<5; |
355 | time |= (0x001F & (u16)(pTimeStruct->Sec/2)); |
355 | time |= (0x001F & (u16)(pTimeStruct->Sec/2)); |
356 | return time; |
356 | return time; |
357 | } |
357 | } |
358 | 358 | ||
359 | /****************************************************************************************************************************************/ |
359 | /****************************************************************************************************************************************/ |
360 | /* Function: LockFilePointer(); */ |
360 | /* Function: LockFilePointer(); */ |
361 | /* */ |
361 | /* */ |
362 | /* Description: This function trys to lock a free file pointer. */ |
362 | /* Description: This function trys to lock a free file pointer. */ |
363 | /* */ |
363 | /* */ |
364 | /* Returnvalue: Returns the Filepointer on success or 0. */ |
364 | /* Returnvalue: Returns the Filepointer on success or 0. */ |
365 | /****************************************************************************************************************************************/ |
365 | /****************************************************************************************************************************************/ |
366 | File_t * LockFilePointer(void) |
366 | File_t * LockFilePointer(void) |
367 | { |
367 | { |
368 | u8 i; |
368 | u8 i; |
369 | File_t * File = 0; |
369 | File_t * File = 0; |
370 | for(i = 0; i < FILE_MAX_OPEN; i++) |
370 | for(i = 0; i < FILE_MAX_OPEN; i++) |
371 | { |
371 | { |
372 | if(FilePointer[i].State == FSTATE_UNUSED) // found an unused one |
372 | if(FilePointer[i].State == FSTATE_UNUSED) // found an unused one |
373 | { |
373 | { |
374 | File = &FilePointer[i]; // set pointer to that entry |
374 | File = &FilePointer[i]; // set pointer to that entry |
375 | FilePointer[i].State = FSTATE_USED; // mark it as used |
375 | FilePointer[i].State = FSTATE_USED; // mark it as used |
376 | break; |
376 | break; |
377 | } |
377 | } |
378 | } |
378 | } |
379 | return(File); |
379 | return(File); |
380 | } |
380 | } |
381 | 381 | ||
382 | /****************************************************************************************************************************************/ |
382 | /****************************************************************************************************************************************/ |
383 | /* Function: UnlockFilePointer(file_t *); */ |
383 | /* Function: UnlockFilePointer(file_t *); */ |
384 | /* */ |
384 | /* */ |
385 | /* Description: This function trys to unlock a file pointer. */ |
385 | /* Description: This function trys to unlock a file pointer. */ |
386 | /* */ |
386 | /* */ |
387 | /* Returnvalue: Returns 1 if file pointer was freed else 0. */ |
387 | /* Returnvalue: Returns 1 if file pointer was freed else 0. */ |
388 | /****************************************************************************************************************************************/ |
388 | /****************************************************************************************************************************************/ |
389 | u8 UnlockFilePointer(File_t * file) |
389 | u8 UnlockFilePointer(File_t * file) |
390 | { |
390 | { |
391 | u8 cnt; |
391 | u8 cnt; |
392 | if(file == NULL) return(0); |
392 | if(file == NULL) return(0); |
393 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
393 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
394 | { |
394 | { |
395 | if(&FilePointer[cnt] == file) // filepointer to be freed found? |
395 | if(&FilePointer[cnt] == file) // filepointer to be freed found? |
396 | { |
396 | { |
397 | file->State = FSTATE_UNUSED; |
397 | file->State = FSTATE_UNUSED; |
398 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; // Sectorpointer to the first sector of the first datacluster of the file. |
398 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; // Sectorpointer to the first sector of the first datacluster of the file. |
399 | file->FirstSectorOfCurrCluster = SECTOR_UNDEFINED; // Pointer to the cluster which is edited at the moment. |
399 | file->FirstSectorOfCurrCluster = SECTOR_UNDEFINED; // Pointer to the cluster which is edited at the moment. |
400 | file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
400 | file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
401 | file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
401 | file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
402 | file->Mode = 0; // mode of fileoperation (read,write) |
402 | file->Mode = 0; // mode of fileoperation (read,write) |
403 | file->Size = 0; // the size of the opend file in bytes. |
403 | file->Size = 0; // the size of the opend file in bytes. |
404 | file->Position = 0; // pointer to a character within the file 0 < fileposition < filesize |
404 | file->Position = 0; // pointer to a character within the file 0 < fileposition < filesize |
405 | file->SectorInCache = SECTOR_UNDEFINED; // the last sector read, wich is still in the sectorbuffer. |
405 | file->SectorInCache = SECTOR_UNDEFINED; // the last sector read, wich is still in the sectorbuffer. |
406 | file->DirectorySector = SECTOR_UNDEFINED; // the sectorposition where the directoryentry has been made. |
406 | file->DirectorySector = SECTOR_UNDEFINED; // the sectorposition where the directoryentry has been made. |
407 | file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
407 | file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
408 | file->Attribute = 0; // the attribute of the file opened. |
408 | file->Attribute = 0; // the attribute of the file opened. |
409 | file = NULL; |
409 | file = NULL; |
410 | return(1); |
410 | return(1); |
411 | } |
411 | } |
412 | } |
412 | } |
413 | return(0); |
413 | return(0); |
414 | } |
414 | } |
415 | 415 | ||
416 | /****************************************************************************************************************************************/ |
416 | /****************************************************************************************************************************************/ |
417 | /* Function: SeperateDirName(s8*, s8*); */ |
417 | /* Function: SeperateDirName(s8*, s8*); */ |
418 | /* */ |
418 | /* */ |
419 | /* Description: This function seperates the first dirname from filepath and brings them */ |
419 | /* Description: This function seperates the first dirname from filepath and brings them */ |
420 | /* into the needed format ('test.txt' -> 'TEST TXT') */ |
420 | /* into the needed format ('test.txt' -> 'TEST TXT') */ |
421 | /* The subpath is the pointer to the remaining substring of the filepath */ |
421 | /* The subpath is the pointer to the remaining substring of the filepath */ |
422 | /* */ |
422 | /* */ |
423 | /* Returnvalue: Return NULL on error or pointer to subpath */ |
423 | /* Returnvalue: Return NULL on error or pointer to subpath */ |
424 | /****************************************************************************************************************************************/ |
424 | /****************************************************************************************************************************************/ |
425 | s8* SeperateDirName(const s8 *filepath, s8 *dirname) |
425 | s8* SeperateDirName(const s8 *filepath, s8 *dirname) |
426 | { |
426 | { |
427 | s8* subpath = NULL; |
427 | s8* subpath = NULL; |
428 | u8 readpointer = 0; |
428 | u8 readpointer = 0; |
429 | u8 writepointer = 0; |
429 | u8 writepointer = 0; |
430 | 430 | ||
431 | // search subpath from beginning of filepath |
431 | // search subpath from beginning of filepath |
432 | subpath = NULL; |
432 | subpath = NULL; |
433 | readpointer = 0; |
433 | readpointer = 0; |
434 | if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
434 | if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
435 | while(subpath == NULL) // search the filepath until a subpath was found. |
435 | while(subpath == NULL) // search the filepath until a subpath was found. |
436 | { |
436 | { |
437 | if(((filepath[readpointer] == 0) || (filepath[readpointer] == '/'))) // if '/' found or end of filepath reached |
437 | if(((filepath[readpointer] == 0) || (filepath[readpointer] == '/'))) // if '/' found or end of filepath reached |
438 | { |
438 | { |
439 | subpath = (s8*)&filepath[readpointer]; // store the position of the first "/" found after the beginning of the filenpath |
439 | subpath = (s8*)&filepath[readpointer]; // store the position of the first "/" found after the beginning of the filenpath |
440 | } |
440 | } |
441 | readpointer++; |
441 | readpointer++; |
442 | } |
442 | } |
443 | 443 | ||
444 | // clear dirname with spaces |
444 | // clear dirname with spaces |
445 | dirname[11] = 0; // terminate dirname |
445 | dirname[11] = 0; // terminate dirname |
446 | for(writepointer = 0; writepointer < 11; writepointer++) dirname[writepointer] = ' '; |
446 | for(writepointer = 0; writepointer < 11; writepointer++) dirname[writepointer] = ' '; |
447 | writepointer = 0; |
447 | writepointer = 0; |
448 | // start seperating the dirname from the filepath. |
448 | // start seperating the dirname from the filepath. |
449 | readpointer = 0; |
449 | readpointer = 0; |
450 | if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
450 | if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
451 | while( &filepath[readpointer] < subpath) |
451 | while( &filepath[readpointer] < subpath) |
452 | { |
452 | { |
453 | if(writepointer >= 11) return(NULL); // dirname to long |
453 | if(writepointer >= 11) return(NULL); // dirname to long |
454 | if(filepath[readpointer] == '.') // seperating dirname and extension. |
454 | if(filepath[readpointer] == '.') // seperating dirname and extension. |
455 | { |
455 | { |
456 | if(writepointer <= 8) |
456 | if(writepointer <= 8) |
457 | { |
457 | { |
458 | readpointer++; // next character in filename |
458 | readpointer++; // next character in filename |
459 | writepointer = 8; // jump to start of extension |
459 | writepointer = 8; // jump to start of extension |
460 | } |
460 | } |
461 | else return(NULL); // dirbasename to long |
461 | else return(NULL); // dirbasename to long |
462 | } |
462 | } |
463 | else |
463 | else |
464 | { |
464 | { |
465 | if((0x60 < filepath[readpointer]) && (filepath[readpointer] < 0x7B)) |
465 | if((0x60 < filepath[readpointer]) && (filepath[readpointer] < 0x7B)) |
466 | { |
466 | { |
467 | dirname[writepointer] = (filepath[readpointer] - 0x20); // all characters must be upper case. |
467 | dirname[writepointer] = (filepath[readpointer] - 0x20); // all characters must be upper case. |
468 | } |
468 | } |
469 | else |
469 | else |
470 | { |
470 | { |
471 | dirname[writepointer] = filepath[readpointer]; |
471 | dirname[writepointer] = filepath[readpointer]; |
472 | } |
472 | } |
473 | readpointer++; |
473 | readpointer++; |
474 | writepointer++; |
474 | writepointer++; |
475 | } |
475 | } |
476 | } |
476 | } |
477 | return(subpath); |
477 | return(subpath); |
478 | } |
478 | } |
479 | 479 | ||
480 | 480 | ||
481 | /**************************************************************************************************************************************+*/ |
481 | /**************************************************************************************************************************************+*/ |
482 | /* Function: Fat16ClusterToSector( u16 cluster); */ |
482 | /* Function: Fat16ClusterToSector( u16 cluster); */ |
483 | /* */ |
483 | /* */ |
484 | /* Description: This function converts a cluster number given by the fat to the corresponding */ |
484 | /* Description: This function converts a cluster number given by the fat to the corresponding */ |
485 | /* sector that points to the start of the data area that is represented by the cluster number. */ |
485 | /* sector that points to the start of the data area that is represented by the cluster number. */ |
486 | /* */ |
486 | /* */ |
487 | /* Returnvalue: The sector number with the data area of the given cluster */ |
487 | /* Returnvalue: The sector number with the data area of the given cluster */ |
488 | /****************************************************************************************************************************************/ |
488 | /****************************************************************************************************************************************/ |
489 | u32 Fat16ClusterToSector(u16 cluster) |
489 | u32 Fat16ClusterToSector(u16 cluster) |
490 | { |
490 | { |
491 | if(!Partition.IsValid) return SECTOR_UNDEFINED; |
491 | if(!Partition.IsValid) return SECTOR_UNDEFINED; |
492 | if ((cluster < 2) || (cluster == CLUSTER_UNDEFINED)) |
492 | if ((cluster < 2) || (cluster == CLUSTER_UNDEFINED)) |
493 | { |
493 | { |
494 | return SECTOR_UNDEFINED; |
494 | return SECTOR_UNDEFINED; |
495 | } |
495 | } |
496 | else |
496 | else |
497 | { |
497 | { |
498 | return ( (cluster - 2) * Partition.SectorsPerCluster) + Partition.FirstDataSector; // the first data sector is represented by the 2nd cluster |
498 | return ( (cluster - 2) * Partition.SectorsPerCluster) + Partition.FirstDataSector; // the first data sector is represented by the 2nd cluster |
499 | } |
499 | } |
500 | } |
500 | } |
501 | 501 | ||
502 | /****************************************************************************************************************************************/ |
502 | /****************************************************************************************************************************************/ |
503 | /* Function: SectorToFat16Cluster( u32 sector); */ |
503 | /* Function: SectorToFat16Cluster( u32 sector); */ |
504 | /* */ |
504 | /* */ |
505 | /* Description: This function converts a given sector number given to the corresponding */ |
505 | /* Description: This function converts a given sector number given to the corresponding */ |
506 | /* cluster number in the fat that represents this data area. */ |
506 | /* cluster number in the fat that represents this data area. */ |
507 | /* */ |
507 | /* */ |
508 | /* Returnvalue: The cluster number representing the data area of the sector. */ |
508 | /* Returnvalue: The cluster number representing the data area of the sector. */ |
509 | /****************************************************************************************************************************************/ |
509 | /****************************************************************************************************************************************/ |
510 | u16 SectorToFat16Cluster(u32 sector) |
510 | u16 SectorToFat16Cluster(u32 sector) |
511 | { |
511 | { |
512 | if(!Partition.IsValid) return CLUSTER_UNDEFINED; |
512 | if(!Partition.IsValid) return CLUSTER_UNDEFINED; |
513 | if((sector == SECTOR_UNDEFINED) || (sector < Partition.FirstDataSector)) return CLUSTER_UNDEFINED; |
513 | if((sector == SECTOR_UNDEFINED) || (sector < Partition.FirstDataSector)) return CLUSTER_UNDEFINED; |
514 | else return ((u16)((sector - Partition.FirstDataSector) / Partition.SectorsPerCluster) + 2); |
514 | else return ((u16)((sector - Partition.FirstDataSector) / Partition.SectorsPerCluster) + 2); |
515 | } |
515 | } |
516 | 516 | ||
517 | 517 | ||
518 | /****************************************************************************************************************************************/ |
518 | /****************************************************************************************************************************************/ |
519 | /* Function: Fat16_IsValid(void); */ |
519 | /* Function: Fat16_IsValid(void); */ |
520 | /* */ |
520 | /* */ |
521 | /* Description: This function return the Fat 16 filesystem state */ |
521 | /* Description: This function return the Fat 16 filesystem state */ |
522 | /* */ |
522 | /* */ |
523 | /* Returnvalue: The function returns "1" on success */ |
523 | /* Returnvalue: The function returns "1" on success */ |
524 | /****************************************************************************************************************************************/ |
524 | /****************************************************************************************************************************************/ |
525 | u8 Fat16_IsValid(void) |
525 | u8 Fat16_IsValid(void) |
526 | { |
526 | { |
527 | return(Partition.IsValid); |
527 | return(Partition.IsValid); |
528 | } |
528 | } |
529 | 529 | ||
530 | /****************************************************************************************************************************************/ |
530 | /****************************************************************************************************************************************/ |
531 | /* Function: Fat16_Deinit(void); */ |
531 | /* Function: Fat16_Deinit(void); */ |
532 | /* */ |
532 | /* */ |
533 | /* Description: This function uninitializes the fat 16 api */ |
533 | /* Description: This function uninitializes the fat 16 api */ |
534 | /* */ |
534 | /* */ |
535 | /* Returnvalue: The function returns "0" on success */ |
535 | /* Returnvalue: The function returns "0" on success */ |
536 | /****************************************************************************************************************************************/ |
536 | /****************************************************************************************************************************************/ |
537 | u8 Fat16_Deinit(void) |
537 | u8 Fat16_Deinit(void) |
538 | { |
538 | { |
539 | s16 returnvalue = 0; |
539 | s16 returnvalue = 0; |
540 | u8 cnt; |
540 | u8 cnt; |
541 | 541 | ||
542 | UART1_PutString("\r\n FAT16 deinit..."); |
542 | UART1_PutString("\r\n FAT16 deinit..."); |
543 | // declare the filepointers as unused. |
543 | // declare the filepointers as unused. |
544 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
544 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
545 | { |
545 | { |
546 | if(FilePointer[cnt].State == FSTATE_USED) |
- | |
547 | { |
- | |
548 | returnvalue += fclose_(&FilePointer[cnt]); // try to close open file pointers |
- | |
549 | } |
- | |
550 | else UnlockFilePointer(&FilePointer[cnt]); |
546 | UnlockFilePointer(&FilePointer[cnt]); |
551 | - | ||
552 | } |
547 | } |
553 | SDC_Deinit(); // uninitialize interface to sd-card |
548 | returnvalue = SDC_Deinit(); // uninitialize interface to sd-card |
554 | Partition.IsValid = 0; // mark data in partition structure as invalid |
549 | Partition.IsValid = 0; // mark data in partition structure as invalid |
555 | Partition.VolumeLabel[0]='\0'; |
550 | Partition.VolumeLabel[0]='\0'; |
556 | UART1_PutString("ok"); |
551 | UART1_PutString("ok"); |
557 | return(returnvalue); |
552 | return(returnvalue); |
558 | } |
553 | } |
559 | 554 | ||
560 | /****************************************************************************************************************************************/ |
555 | /****************************************************************************************************************************************/ |
561 | /* Function: Fat16_Init(void); */ |
556 | /* Function: Fat16_Init(void); */ |
562 | /* */ |
557 | /* */ |
563 | /* Description: This function reads the Masterbootrecord and finds the position of the Volumebootrecord, the FAT and the Rootdir */ |
558 | /* Description: This function reads the Masterbootrecord and finds the position of the Volumebootrecord, the FAT and the Rootdir */ |
564 | /* and stores the information in global variables. */ |
559 | /* and stores the information in global variables. */ |
565 | /* */ |
560 | /* */ |
566 | /* Returnvalue: The function returns "0" if the filesystem is initialized. */ |
561 | /* Returnvalue: The function returns "0" if the filesystem is initialized. */ |
567 | /****************************************************************************************************************************************/ |
562 | /****************************************************************************************************************************************/ |
568 | u8 Fat16_Init(void) |
563 | u8 Fat16_Init(void) |
569 | { |
564 | { |
570 | u8 cnt = 0; |
565 | u8 cnt = 0; |
571 | u32 partitionfirstsector; |
566 | u32 partitionfirstsector; |
572 | VBR_Entry_t *VBR; |
567 | VBR_Entry_t *VBR; |
573 | MBR_Entry_t *MBR; |
568 | MBR_Entry_t *MBR; |
574 | File_t *file; |
569 | File_t *file; |
575 | u8 result = 0; |
570 | u8 result = 0; |
576 | 571 | ||
577 | UART1_PutString("\r\n FAT16 init..."); |
572 | UART1_PutString("\r\n FAT16 init..."); |
578 | Partition.IsValid = 0; |
573 | Partition.IsValid = 0; |
579 | 574 | ||
580 | // declare the filepointers as unused. |
575 | // declare the filepointers as unused. |
581 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
576 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
582 | { |
577 | { |
583 | UnlockFilePointer(&FilePointer[cnt]); |
578 | UnlockFilePointer(&FilePointer[cnt]); |
584 | } |
579 | } |
585 | // set current file pinter to first position in list |
580 | // set current file pinter to first position in list |
586 | file = &FilePointer[0]; |
581 | file = &FilePointer[0]; |
587 | 582 | ||
588 | // try to initialize the sd-card. |
583 | // try to initialize the sd-card. |
589 | if(SD_SUCCESS != SDC_Init()) |
584 | if(SD_SUCCESS != SDC_Init()) |
590 | { |
585 | { |
591 | UART1_PutString("SD-Card could not be initialized."); |
586 | UART1_PutString("SD-Card could not be initialized."); |
592 | result = 1; |
587 | result = 1; |
593 | goto end; |
588 | goto end; |
594 | } |
589 | } |
595 | 590 | ||
596 | // SD-Card is initialized successfully |
591 | // SD-Card is initialized successfully |
597 | if(SD_SUCCESS != SDC_GetSector((u32)MBR_SECTOR,file->Cache)) // Read the MasterBootRecord |
592 | if(SD_SUCCESS != SDC_GetSector((u32)MBR_SECTOR,file->Cache)) // Read the MasterBootRecord |
598 | { |
593 | { |
599 | UART1_PutString("Error reading the MBR."); |
594 | UART1_PutString("Error reading the MBR."); |
600 | result = 2; |
595 | result = 2; |
601 | goto end; |
596 | goto end; |
602 | } |
597 | } |
603 | MBR = (MBR_Entry_t *)file->Cache; // Enter the MBR using the structure MBR_Entry_t. |
598 | MBR = (MBR_Entry_t *)file->Cache; // Enter the MBR using the structure MBR_Entry_t. |
604 | if((MBR->PartitionEntry1.Type == PART_TYPE_FAT16_ST_32_MB) || |
599 | if((MBR->PartitionEntry1.Type == PART_TYPE_FAT16_ST_32_MB) || |
605 | (MBR->PartitionEntry1.Type == PART_TYPE_FAT16_LT_32_MB) || |
600 | (MBR->PartitionEntry1.Type == PART_TYPE_FAT16_LT_32_MB) || |
606 | (MBR->PartitionEntry1.Type == PART_TYPE_FAT16LBA)) |
601 | (MBR->PartitionEntry1.Type == PART_TYPE_FAT16LBA)) |
607 | { |
602 | { |
608 | // get sector offset 1st partition |
603 | // get sector offset 1st partition |
609 | partitionfirstsector = MBR->PartitionEntry1.NoSectorsBeforePartition; |
604 | partitionfirstsector = MBR->PartitionEntry1.NoSectorsBeforePartition; |
610 | // Start of Partition is the Volume Boot Sector |
605 | // Start of Partition is the Volume Boot Sector |
611 | if(SD_SUCCESS != SDC_GetSector(partitionfirstsector,file->Cache)) // Read the volume boot record |
606 | if(SD_SUCCESS != SDC_GetSector(partitionfirstsector,file->Cache)) // Read the volume boot record |
612 | { |
607 | { |
613 | UART1_PutString("Error reading the VBR."); |
608 | UART1_PutString("Error reading the VBR."); |
614 | result = 3; |
609 | result = 3; |
615 | goto end; |
610 | goto end; |
616 | } |
611 | } |
617 | } |
612 | } |
618 | else // maybe the medium has no partition assuming sector 0 is the vbr |
613 | else // maybe the medium has no partition assuming sector 0 is the vbr |
619 | { |
614 | { |
620 | partitionfirstsector = 0; |
615 | partitionfirstsector = 0; |
621 | } |
616 | } |
622 | 617 | ||
623 | VBR = (VBR_Entry_t *) file->Cache; // Enter the VBR using the structure VBR_Entry_t. |
618 | VBR = (VBR_Entry_t *) file->Cache; // Enter the VBR using the structure VBR_Entry_t. |
624 | if(VBR->BytesPerSector != BYTES_PER_SECTOR) |
619 | if(VBR->BytesPerSector != BYTES_PER_SECTOR) |
625 | { |
620 | { |
626 | UART1_PutString("VBR: Sector size not supported."); |
621 | UART1_PutString("VBR: Sector size not supported."); |
627 | result = 4; |
622 | result = 4; |
628 | goto end; |
623 | goto end; |
629 | } |
624 | } |
630 | Partition.SectorsPerCluster = VBR->SectorsPerCluster; // Number of sectors per cluster. Depends on the memorysize of the sd-card. |
625 | Partition.SectorsPerCluster = VBR->SectorsPerCluster; // Number of sectors per cluster. Depends on the memorysize of the sd-card. |
631 | Partition.FatCopies = VBR->NoFATCopies; // Number of fatcopies. |
626 | Partition.FatCopies = VBR->NoFATCopies; // Number of fatcopies. |
632 | Partition.MaxRootEntries = VBR->MaxRootEntries; // How many Entries are possible in the rootdirectory (FAT16 allows max. 512 entries). |
627 | Partition.MaxRootEntries = VBR->MaxRootEntries; // How many Entries are possible in the rootdirectory (FAT16 allows max. 512 entries). |
633 | Partition.SectorsPerFat = VBR->SectorsPerFAT; // The number of sectors per FAT // copy volume label |
628 | Partition.SectorsPerFat = VBR->SectorsPerFAT; // The number of sectors per FAT // copy volume label |
634 | Partition.VolumeLabel[0] = '\0'; // set string terminator |
629 | Partition.VolumeLabel[0] = '\0'; // set string terminator |
635 | 630 | ||
636 | /* Calculate the sectorpositon of the FAT, the Rootdirectory and the first Datacluster. */ |
631 | /* Calculate the sectorpositon of the FAT, the Rootdirectory and the first Datacluster. */ |
637 | // Calculate the position of the FileAllocationTable: |
632 | // Calculate the position of the FileAllocationTable: |
638 | // Start + # of Reserved Sectors |
633 | // Start + # of Reserved Sectors |
639 | Partition.FirstFatSector = (u32)(partitionfirstsector + (u32)(VBR->ReservedSectors)); |
634 | Partition.FirstFatSector = (u32)(partitionfirstsector + (u32)(VBR->ReservedSectors)); |
640 | // Calculate the position of the Rootdirectory: |
635 | // Calculate the position of the Rootdirectory: |
641 | // Start + # of Reserved Sectors + (# of Sectors Per FAT * # of FAT Copies) |
636 | // Start + # of Reserved Sectors + (# of Sectors Per FAT * # of FAT Copies) |
642 | Partition.FirstRootDirSector = Partition.FirstFatSector + (u32)((u32)Partition.SectorsPerFat*(u32)Partition.FatCopies); |
637 | Partition.FirstRootDirSector = Partition.FirstFatSector + (u32)((u32)Partition.SectorsPerFat*(u32)Partition.FatCopies); |
643 | // Calculate the position of the first datacluster: |
638 | // Calculate the position of the first datacluster: |
644 | // Start + # of Reserved + (# of Sectors Per FAT * # of FAT Copies) + ((Maximum Root Directory Entries * 32) / Bytes per Sector) |
639 | // Start + # of Reserved + (# of Sectors Per FAT * # of FAT Copies) + ((Maximum Root Directory Entries * 32) / Bytes per Sector) |
645 | Partition.FirstDataSector = Partition.FirstRootDirSector + (u32)(Partition.MaxRootEntries>>4); // assuming 512 Byte Per Sector |
640 | Partition.FirstDataSector = Partition.FirstRootDirSector + (u32)(Partition.MaxRootEntries>>4); // assuming 512 Byte Per Sector |
646 | // Calculate the last data sector |
641 | // Calculate the last data sector |
647 | if(VBR->NoSectors == 0) |
642 | if(VBR->NoSectors == 0) |
648 | { |
643 | { |
649 | UART1_PutString("VBR: Bad number of sectors."); |
644 | UART1_PutString("VBR: Bad number of sectors."); |
650 | result = 5; |
645 | result = 5; |
651 | goto end; |
646 | goto end; |
652 | } |
647 | } |
653 | Partition.LastDataSector = Partition.FirstDataSector + VBR->NoSectors - 1; |
648 | Partition.LastDataSector = Partition.FirstDataSector + VBR->NoSectors - 1; |
654 | // check for FAT16 in VBR of first partition |
649 | // check for FAT16 in VBR of first partition |
655 | if(!((VBR->FATName[0]=='F') && (VBR->FATName[1]=='A') && (VBR->FATName[2]=='T') && (VBR->FATName[3]=='1')&&(VBR->FATName[4]=='6'))) |
650 | if(!((VBR->FATName[0]=='F') && (VBR->FATName[1]=='A') && (VBR->FATName[2]=='T') && (VBR->FATName[3]=='1')&&(VBR->FATName[4]=='6'))) |
656 | { |
651 | { |
657 | UART1_PutString("VBR: Partition ist not FAT16 type."); |
652 | UART1_PutString("VBR: Partition ist not FAT16 type."); |
658 | result = 6; |
653 | result = 6; |
659 | goto end; |
654 | goto end; |
660 | } |
655 | } |
661 | Partition.IsValid = 1; // mark data in partition structure as valid |
656 | Partition.IsValid = 1; // mark data in partition structure as valid |
662 | result = 0; |
657 | result = 0; |
663 | end: |
658 | end: |
664 | if(result != 0) Fat16_Deinit(); |
659 | if(result != 0) Fat16_Deinit(); |
665 | else UART1_PutString("ok"); |
660 | else UART1_PutString("ok"); |
666 | return(result); |
661 | return(result); |
667 | } |
662 | } |
668 | 663 | ||
669 | 664 | ||
670 | 665 | ||
671 | /****************************************************************************************************************************************/ |
666 | /****************************************************************************************************************************************/ |
672 | /* Function: ClearCurrCluster(File_t*); */ |
667 | /* Function: ClearCurrCluster(File_t*); */ |
673 | /* */ |
668 | /* */ |
674 | /* Description: This function fills the current cluster with 0. */ |
669 | /* Description: This function fills the current cluster with 0. */ |
675 | /* */ |
670 | /* */ |
676 | /* Returnvalue: The function returns 1 on success else 0. */ |
671 | /* Returnvalue: The function returns 1 on success else 0. */ |
677 | /****************************************************************************************************************************************/ |
672 | /****************************************************************************************************************************************/ |
678 | u8 ClearCurrCluster(File_t * file) |
673 | u8 ClearCurrCluster(File_t * file) |
679 | { |
674 | { |
680 | u8 retvalue = 1; |
675 | u8 retvalue = 1; |
681 | u32 i; |
676 | u32 i; |
682 | 677 | ||
683 | if((!Partition.IsValid) || (file == NULL)) return(0); |
678 | if((!Partition.IsValid) || (file == NULL)) return(0); |
684 | 679 | ||
685 | for(i = 0; i < BYTES_PER_SECTOR; i++) file->Cache[i] = 0; // clear file cache |
680 | for(i = 0; i < BYTES_PER_SECTOR; i++) file->Cache[i] = 0; // clear file cache |
686 | if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return (0); // nothing to do |
681 | if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return (0); // nothing to do |
687 | for(i = 0; i < Partition.SectorsPerCluster; i++) |
682 | for(i = 0; i < Partition.SectorsPerCluster; i++) |
688 | { |
683 | { |
689 | file->SectorInCache = file->FirstSectorOfCurrCluster + i; |
684 | file->SectorInCache = file->FirstSectorOfCurrCluster + i; |
690 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
685 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
691 | { |
686 | { |
692 | Fat16_Deinit(); |
687 | Fat16_Deinit(); |
693 | retvalue = 0; |
688 | retvalue = 0; |
694 | return(retvalue); |
689 | return(retvalue); |
695 | } |
690 | } |
696 | } |
691 | } |
697 | return(retvalue); |
692 | return(retvalue); |
698 | } |
693 | } |
699 | 694 | ||
700 | /*****************************************************************************************************************************************/ |
695 | /*****************************************************************************************************************************************/ |
701 | /* Function: GetNextCluster(File_t* ); */ |
696 | /* Function: GetNextCluster(File_t* ); */ |
702 | /* */ |
697 | /* */ |
703 | /* Description: This function finds the next datacluster of the file specified with File *File. */ |
698 | /* Description: This function finds the next datacluster of the file specified with File *File. */ |
704 | /* */ |
699 | /* */ |
705 | /* Returnvalue: The function returns the next cluster or 0 if the last cluster has already reached. */ |
700 | /* Returnvalue: The function returns the next cluster or 0 if the last cluster has already reached. */ |
706 | /*****************************************************************************************************************************************/ |
701 | /*****************************************************************************************************************************************/ |
707 | u16 GetNextCluster(File_t * file) |
702 | u16 GetNextCluster(File_t * file) |
708 | { |
703 | { |
709 | u16 cluster = CLUSTER_UNDEFINED; |
704 | u16 cluster = CLUSTER_UNDEFINED; |
710 | u32 fat_byte_offset, sector, byte; |
705 | u32 fat_byte_offset, sector, byte; |
711 | Fat16Entry_t * fat; |
706 | Fat16Entry_t * fat; |
712 | 707 | ||
713 | if((!Partition.IsValid) || (file == NULL)) return(cluster); |
708 | if((!Partition.IsValid) || (file == NULL)) return(cluster); |
714 | if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return(cluster); |
709 | if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return(cluster); |
715 | // if sector is within the data area |
710 | // if sector is within the data area |
716 | if((Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)&& (file->FirstSectorOfCurrCluster <= Partition.LastDataSector)) |
711 | if((Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)&& (file->FirstSectorOfCurrCluster <= Partition.LastDataSector)) |
717 | { |
712 | { |
718 | // determine current file cluster |
713 | // determine current file cluster |
719 | cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); |
714 | cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); |
720 | // calculate byte offset in the fat for corresponding entry |
715 | // calculate byte offset in the fat for corresponding entry |
721 | fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
716 | fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
722 | // calculate the sector that contains the current cluster within the fat |
717 | // calculate the sector that contains the current cluster within the fat |
723 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
718 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
724 | // calculate byte offset of the current cluster within that fat sector |
719 | // calculate byte offset of the current cluster within that fat sector |
725 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
720 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
726 | // read this sector to the file cache |
721 | // read this sector to the file cache |
727 | if(file->SectorInCache != sector) |
722 | if(file->SectorInCache != sector) |
728 | { |
723 | { |
729 | file->SectorInCache = sector; // update sector stored in buffer |
724 | file->SectorInCache = sector; // update sector stored in buffer |
730 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
725 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
731 | { |
726 | { |
732 | Fat16_Deinit(); |
727 | Fat16_Deinit(); |
733 | return (cluster); |
728 | return (cluster); |
734 | } |
729 | } |
735 | } |
730 | } |
736 | // read the next cluster from cache |
731 | // read the next cluster from cache |
737 | fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
732 | fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
738 | cluster = fat->NextCluster; |
733 | cluster = fat->NextCluster; |
739 | // if no next cluster exist |
734 | // if no next cluster exist |
740 | if(FAT16_CLUSTER_LAST_MIN <= cluster) |
735 | if(FAT16_CLUSTER_LAST_MIN <= cluster) |
741 | { |
736 | { |
742 | cluster = CLUSTER_UNDEFINED; // next cluster is undefined |
737 | cluster = CLUSTER_UNDEFINED; // next cluster is undefined |
743 | } |
738 | } |
744 | else |
739 | else |
745 | { |
740 | { |
746 | file->FirstSectorOfCurrCluster = Fat16ClusterToSector(cluster); |
741 | file->FirstSectorOfCurrCluster = Fat16ClusterToSector(cluster); |
747 | file->SectorOfCurrCluster = 0; |
742 | file->SectorOfCurrCluster = 0; |
748 | file->ByteOfCurrSector = 0; |
743 | file->ByteOfCurrSector = 0; |
749 | } |
744 | } |
750 | } |
745 | } |
751 | return(cluster); |
746 | return(cluster); |
752 | } |
747 | } |
753 | 748 | ||
754 | 749 | ||
755 | /****************************************************************************************************************************************/ |
750 | /****************************************************************************************************************************************/ |
756 | /* Function: FindNextFreeCluster(File_t *); */ |
751 | /* Function: FindNextFreeCluster(File_t *); */ |
757 | /* */ |
752 | /* */ |
758 | /* Description: This function looks in the fat to find the next free cluster */ |
753 | /* Description: This function looks in the fat to find the next free cluster */ |
759 | /* */ |
754 | /* */ |
760 | /* Returnvalue: The function returns the cluster number of the next free cluster found within the fat. */ |
755 | /* Returnvalue: The function returns the cluster number of the next free cluster found within the fat. */ |
761 | /****************************************************************************************************************************************/ |
756 | /****************************************************************************************************************************************/ |
762 | u16 FindNextFreeCluster(File_t *file) |
757 | u16 FindNextFreeCluster(File_t *file) |
763 | { |
758 | { |
764 | u32 fat_sector; // current sector within the fat relative to the first sector of the fat. |
759 | u32 fat_sector; // current sector within the fat relative to the first sector of the fat. |
765 | u32 curr_sector; // current sector |
760 | u32 curr_sector; // current sector |
766 | u16 fat_entry; // index to an fatentry within the actual sector (256 fatentries are possible within one sector). |
761 | u16 fat_entry; // index to an fatentry within the actual sector (256 fatentries are possible within one sector). |
767 | u16 free_cluster = CLUSTER_UNDEFINED; // next free cluster number. |
762 | u16 free_cluster = CLUSTER_UNDEFINED; // next free cluster number. |
768 | Fat16Entry_t * fat; |
763 | Fat16Entry_t * fat; |
769 | 764 | ||
770 | if((!Partition.IsValid) || (file == NULL)) return(0); |
765 | if((!Partition.IsValid) || (file == NULL)) return(0); |
771 | 766 | ||
772 | // start searching for an empty cluster at the beginning of the fat. |
767 | // start searching for an empty cluster at the beginning of the fat. |
773 | fat_sector = 0; |
768 | fat_sector = 0; |
774 | do |
769 | do |
775 | { |
770 | { |
776 | curr_sector = Partition.FirstFatSector + fat_sector; // calculate sector to read |
771 | curr_sector = Partition.FirstFatSector + fat_sector; // calculate sector to read |
777 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
772 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
778 | if( SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector of fat from sd-card. |
773 | if( SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector of fat from sd-card. |
779 | { |
774 | { |
780 | Fat16_Deinit(); |
775 | Fat16_Deinit(); |
781 | return(free_cluster); |
776 | return(free_cluster); |
782 | } |
777 | } |
783 | 778 | ||
784 | fat = (Fat16Entry_t *)file->Cache; // set fat pointer to file cache |
779 | fat = (Fat16Entry_t *)file->Cache; // set fat pointer to file cache |
785 | 780 | ||
786 | for(fat_entry = 0; fat_entry < FAT16_ENTRIES_PER_SECTOR; fat_entry++) // look for an free cluster at all entries in this sector of the fat. |
781 | for(fat_entry = 0; fat_entry < FAT16_ENTRIES_PER_SECTOR; fat_entry++) // look for an free cluster at all entries in this sector of the fat. |
787 | { |
782 | { |
788 | if(fat[fat_entry].NextCluster == FAT16_CLUSTER_FREE) // empty cluster found!! |
783 | if(fat[fat_entry].NextCluster == FAT16_CLUSTER_FREE) // empty cluster found!! |
789 | { |
784 | { |
790 | fat[fat_entry].NextCluster = FAT16_CLUSTER_LAST_MAX; // mark this fat-entry as used |
785 | fat[fat_entry].NextCluster = FAT16_CLUSTER_LAST_MAX; // mark this fat-entry as used |
791 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // and save the sector at the sd-card. |
786 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // and save the sector at the sd-card. |
792 | { |
787 | { |
793 | Fat16_Deinit(); |
788 | Fat16_Deinit(); |
794 | return(free_cluster); |
789 | return(free_cluster); |
795 | } |
790 | } |
796 | free_cluster = (u16)(fat_sector * FAT16_ENTRIES_PER_SECTOR + (u32)fat_entry); |
791 | free_cluster = (u16)(fat_sector * FAT16_ENTRIES_PER_SECTOR + (u32)fat_entry); |
797 | fat_entry = FAT16_ENTRIES_PER_SECTOR; // terminate the search for a free cluster in this sector. |
792 | fat_entry = FAT16_ENTRIES_PER_SECTOR; // terminate the search for a free cluster in this sector. |
798 | } |
793 | } |
799 | } |
794 | } |
800 | fat_sector++; // continue the search in next fat sector |
795 | fat_sector++; // continue the search in next fat sector |
801 | // repeat until the end of the fat is reached and no free cluster has been found so far |
796 | // repeat until the end of the fat is reached and no free cluster has been found so far |
802 | }while((fat_sector < Partition.SectorsPerFat) && (!free_cluster)); |
797 | }while((fat_sector < Partition.SectorsPerFat) && (!free_cluster)); |
803 | return(free_cluster); |
798 | return(free_cluster); |
804 | } |
799 | } |
805 | 800 | ||
806 | 801 | ||
807 | /****************************************************************************************************************************************************/ |
802 | /****************************************************************************************************************************************************/ |
808 | /* Function: s16 fseek_(File_t *, s32 *, u8) */ |
803 | /* Function: s16 fseek_(File_t *, s32 *, u8) */ |
809 | /* */ |
804 | /* */ |
810 | /* Description: This function sets the pointer of the stream relative to the position */ |
805 | /* Description: This function sets the pointer of the stream relative to the position */ |
811 | /* specified by origin (SEEK_SET, SEEK_CUR, SEEK_END) */ |
806 | /* specified by origin (SEEK_SET, SEEK_CUR, SEEK_END) */ |
812 | /* Returnvalue: Is 0 if seek was successful */ |
807 | /* Returnvalue: Is 0 if seek was successful */ |
813 | /****************************************************************************************************************************************************/ |
808 | /****************************************************************************************************************************************************/ |
814 | s16 fseek_(File_t *file, s32 offset, s16 origin) |
809 | s16 fseek_(File_t *file, s32 offset, s16 origin) |
815 | { |
810 | { |
816 | s32 fposition = 0; |
811 | s32 fposition = 0; |
817 | s16 retvalue = 1; |
812 | s16 retvalue = 1; |
818 | 813 | ||
819 | if((!Partition.IsValid) || (file == NULL)) return(retvalue); |
814 | if((!Partition.IsValid) || (file == NULL)) return(retvalue); |
820 | switch(origin) |
815 | switch(origin) |
821 | { |
816 | { |
822 | case SEEK_SET: // Fileposition relative to the beginning of the file. |
817 | case SEEK_SET: // Fileposition relative to the beginning of the file. |
823 | fposition = 0; |
818 | fposition = 0; |
824 | break; |
819 | break; |
825 | case SEEK_END: // Fileposition relative to the end of the file. |
820 | case SEEK_END: // Fileposition relative to the end of the file. |
826 | fposition = (s32)file->Size; |
821 | fposition = (s32)file->Size; |
827 | break; |
822 | break; |
828 | case SEEK_CUR: // Fileposition relative to the current position of the file. |
823 | case SEEK_CUR: // Fileposition relative to the current position of the file. |
829 | default: |
824 | default: |
830 | fposition = file->Position; |
825 | fposition = file->Position; |
831 | break; |
826 | break; |
832 | } |
827 | } |
833 | 828 | ||
834 | fposition += offset; |
829 | fposition += offset; |
835 | 830 | ||
836 | if((fposition >= 0) && (fposition <= (s32)file->Size)) // is the pointer still within the file? |
831 | if((fposition >= 0) && (fposition <= (s32)file->Size)) // is the pointer still within the file? |
837 | { |
832 | { |
838 | // reset file position to start of the file |
833 | // reset file position to start of the file |
839 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
834 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
840 | file->SectorOfCurrCluster = 0; |
835 | file->SectorOfCurrCluster = 0; |
841 | file->ByteOfCurrSector = 0; |
836 | file->ByteOfCurrSector = 0; |
842 | file->Position = 0; |
837 | file->Position = 0; |
843 | if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return(retvalue); |
838 | if(file->FirstSectorOfCurrCluster == SECTOR_UNDEFINED) return(retvalue); |
844 | while(file->Position < fposition) // repeat until the current position is less than target |
839 | while(file->Position < fposition) // repeat until the current position is less than target |
845 | { |
840 | { |
846 | file->Position++; // increment file position |
841 | file->Position++; // increment file position |
847 | file->ByteOfCurrSector++; // next byte in current sector |
842 | file->ByteOfCurrSector++; // next byte in current sector |
848 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) |
843 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) |
849 | { |
844 | { |
850 | file->ByteOfCurrSector = 0; // reading at the beginning of new sector. |
845 | file->ByteOfCurrSector = 0; // reading at the beginning of new sector. |
851 | file->SectorOfCurrCluster++; // continue reading in next sector |
846 | file->SectorOfCurrCluster++; // continue reading in next sector |
852 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster) // if end of cluster is reached, the next datacluster has to be searched in the FAT. |
847 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster) // if end of cluster is reached, the next datacluster has to be searched in the FAT. |
853 | { |
848 | { |
854 | if(GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
849 | if(GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
855 | { |
850 | { |
856 | file->SectorOfCurrCluster = 0; |
851 | file->SectorOfCurrCluster = 0; |
857 | } |
852 | } |
858 | else // the last cluster was allready reached |
853 | else // the last cluster was allready reached |
859 | { |
854 | { |
860 | file->SectorOfCurrCluster--; // jump back to the last sector in the last cluster |
855 | file->SectorOfCurrCluster--; // jump back to the last sector in the last cluster |
861 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set ByteOfCurrSector one byte over sector end |
856 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set ByteOfCurrSector one byte over sector end |
862 | } |
857 | } |
863 | } |
858 | } |
864 | } |
859 | } |
865 | } |
860 | } |
866 | } |
861 | } |
867 | if(file->Position == fposition) retvalue = 0; |
862 | if(file->Position == fposition) retvalue = 0; |
868 | return(retvalue); |
863 | return(retvalue); |
869 | } |
864 | } |
870 | 865 | ||
871 | 866 | ||
872 | /****************************************************************************************************************************************/ |
867 | /****************************************************************************************************************************************/ |
873 | /* Function: u16 DeleteClusterChain(File *file); */ |
868 | /* Function: u16 DeleteClusterChain(File *file); */ |
874 | /* */ |
869 | /* */ |
875 | /* Description: This function trances along a cluster chain in the fat and frees all clusters visited. */ |
870 | /* Description: This function trances along a cluster chain in the fat and frees all clusters visited. */ |
876 | /* */ |
871 | /* */ |
877 | /****************************************************************************************************************************************/ |
872 | /****************************************************************************************************************************************/ |
878 | u8 DeleteClusterChain(u16 StartCluster) |
873 | u8 DeleteClusterChain(u16 StartCluster) |
879 | { |
874 | { |
880 | u16 cluster; |
875 | u16 cluster; |
881 | u32 fat_byte_offset, sector, byte; |
876 | u32 fat_byte_offset, sector, byte; |
882 | Fat16Entry_t * fat; |
877 | Fat16Entry_t * fat; |
883 | u8 buffer[BYTES_PER_SECTOR]; |
878 | u8 buffer[BYTES_PER_SECTOR]; |
884 | u32 sector_in_buffer = 0; |
879 | u32 sector_in_buffer = 0; |
885 | u8 repeat = 0; |
880 | u8 repeat = 0; |
886 | 881 | ||
887 | if(!Partition.IsValid) return(0); |
882 | if(!Partition.IsValid) return(0); |
888 | if(StartCluster == CLUSTER_UNDEFINED) return(0); |
883 | if(StartCluster == CLUSTER_UNDEFINED) return(0); |
889 | cluster = StartCluster; // init chain trace |
884 | cluster = StartCluster; // init chain trace |
890 | // if start cluster is no real cluster |
885 | // if start cluster is no real cluster |
891 | if(FAT16_CLUSTER_LAST_MIN <= cluster) return 1; |
886 | if(FAT16_CLUSTER_LAST_MIN <= cluster) return 1; |
892 | 887 | ||
893 | // calculate byte offset in the fat for corresponding entry |
888 | // calculate byte offset in the fat for corresponding entry |
894 | fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
889 | fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
895 | // calculate the sector that contains the current cluster within the fat |
890 | // calculate the sector that contains the current cluster within the fat |
896 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
891 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
897 | // calculate byte offset of the current cluster within that fat sector |
892 | // calculate byte offset of the current cluster within that fat sector |
898 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
893 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
899 | do |
894 | do |
900 | { |
895 | { |
901 | if(sector != sector_in_buffer) |
896 | if(sector != sector_in_buffer) |
902 | { |
897 | { |
903 | // read this sector to buffer |
898 | // read this sector to buffer |
904 | sector_in_buffer = sector; |
899 | sector_in_buffer = sector; |
905 | if(SD_SUCCESS != SDC_GetSector(sector_in_buffer, buffer)) return 0; // read sector from sd-card |
900 | if(SD_SUCCESS != SDC_GetSector(sector_in_buffer, buffer)) return 0; // read sector from sd-card |
906 | } |
901 | } |
907 | // read the next cluster from cache |
902 | // read the next cluster from cache |
908 | fat = (Fat16Entry_t *)(&(buffer[byte])); |
903 | fat = (Fat16Entry_t *)(&(buffer[byte])); |
909 | cluster = fat->NextCluster; |
904 | cluster = fat->NextCluster; |
910 | fat->NextCluster = FAT16_CLUSTER_FREE; // mark current cluster as free |
905 | fat->NextCluster = FAT16_CLUSTER_FREE; // mark current cluster as free |
911 | 906 | ||
912 | if((FAT16_CLUSTER_USED_MIN <= cluster) && (cluster <= FAT16_CLUSTER_USED_MAX) ) |
907 | if((FAT16_CLUSTER_USED_MIN <= cluster) && (cluster <= FAT16_CLUSTER_USED_MAX) ) |
913 | { |
908 | { |
914 | repeat = 1; |
909 | repeat = 1; |
915 | // calculate sector byte and byte offset in the fat for the next cluster |
910 | // calculate sector byte and byte offset in the fat for the next cluster |
916 | fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
911 | fat_byte_offset = ((u32)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
917 | // calculate the sector that contains the current cluster within the fat |
912 | // calculate the sector that contains the current cluster within the fat |
918 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
913 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
919 | // calculate byte offset of the current cluster within that fat sector |
914 | // calculate byte offset of the current cluster within that fat sector |
920 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
915 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
921 | } |
916 | } |
922 | else repeat = 0; |
917 | else repeat = 0; |
923 | 918 | ||
924 | // if new sector is not the sector in buffer or the last cluster in the chain was traced |
919 | // if new sector is not the sector in buffer or the last cluster in the chain was traced |
925 | if((sector != sector_in_buffer) || !repeat) |
920 | if((sector != sector_in_buffer) || !repeat) |
926 | { // write sector in buffer |
921 | { // write sector in buffer |
927 | if(SD_SUCCESS != SDC_PutSector(sector_in_buffer,buffer)) |
922 | if(SD_SUCCESS != SDC_PutSector(sector_in_buffer,buffer)) |
928 | { |
923 | { |
929 | Fat16_Deinit(); |
924 | Fat16_Deinit(); |
930 | return(0); |
925 | return(0); |
931 | } |
926 | } |
932 | } |
927 | } |
933 | } |
928 | } |
934 | while(repeat); |
929 | while(repeat); |
935 | 930 | ||
936 | return 1; |
931 | return 1; |
937 | } |
932 | } |
938 | 933 | ||
939 | 934 | ||
940 | /****************************************************************************************************************************************/ |
935 | /****************************************************************************************************************************************/ |
941 | /* Function: u16 AppendCluster(File *file); */ |
936 | /* Function: u16 AppendCluster(File *file); */ |
942 | /* */ |
937 | /* */ |
943 | /* Description: This function looks in the fat to find the next free cluster and appends it to the file. */ |
938 | /* Description: This function looks in the fat to find the next free cluster and appends it to the file. */ |
944 | /* */ |
939 | /* */ |
945 | /* Returnvalue: The function returns the appened cluster number or CLUSTER_UNDEFINED of no cluster was appended. */ |
940 | /* Returnvalue: The function returns the appened cluster number or CLUSTER_UNDEFINED of no cluster was appended. */ |
946 | /****************************************************************************************************************************************/ |
941 | /****************************************************************************************************************************************/ |
947 | u16 AppendCluster(File_t *file) |
942 | u16 AppendCluster(File_t *file) |
948 | { |
943 | { |
949 | u16 last_cluster, new_cluster = CLUSTER_UNDEFINED; |
944 | u16 last_cluster, new_cluster = CLUSTER_UNDEFINED; |
950 | u32 fat_byte_offset, sector, byte; |
945 | u32 fat_byte_offset, sector, byte; |
951 | Fat16Entry_t * fat; |
946 | Fat16Entry_t * fat; |
952 | 947 | ||
953 | if((!Partition.IsValid) || (file == NULL)) return(new_cluster); |
948 | if((!Partition.IsValid) || (file == NULL)) return(new_cluster); |
954 | 949 | ||
955 | new_cluster = FindNextFreeCluster(file); // the next free cluster found on the disk. |
950 | new_cluster = FindNextFreeCluster(file); // the next free cluster found on the disk. |
956 | if(new_cluster != CLUSTER_UNDEFINED) |
951 | if(new_cluster != CLUSTER_UNDEFINED) |
957 | { // A free cluster was found and can be added to the end of the file. |
952 | { // A free cluster was found and can be added to the end of the file. |
958 | fseek_(file, 0, SEEK_END); // jump to the end of the file |
953 | fseek_(file, 0, SEEK_END); // jump to the end of the file |
959 | last_cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); // determine current file cluster |
954 | last_cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); // determine current file cluster |
960 | if(last_cluster != CLUSTER_UNDEFINED) |
955 | if(last_cluster != CLUSTER_UNDEFINED) |
961 | { |
956 | { |
962 | // update FAT entry of last cluster |
957 | // update FAT entry of last cluster |
963 | fat_byte_offset = ((u32)last_cluster)<<1; |
958 | fat_byte_offset = ((u32)last_cluster)<<1; |
964 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
959 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
965 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
960 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
966 | // read the sector containing the last cluster of the file |
961 | // read the sector containing the last cluster of the file |
967 | if(file->SectorInCache != sector) |
962 | if(file->SectorInCache != sector) |
968 | { |
963 | { |
969 | file->SectorInCache = sector; // update sector stored in buffer |
964 | file->SectorInCache = sector; // update sector stored in buffer |
970 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
965 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
971 | { |
966 | { |
972 | Fat16_Deinit(); |
967 | Fat16_Deinit(); |
973 | return(0); |
968 | return(0); |
974 | } |
969 | } |
975 | } |
970 | } |
976 | fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
971 | fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
977 | fat->NextCluster = new_cluster; // append the free cluster to the end of the file in the FAT. |
972 | fat->NextCluster = new_cluster; // append the free cluster to the end of the file in the FAT. |
978 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // save the modified sector to the FAT. |
973 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // save the modified sector to the FAT. |
979 | { |
974 | { |
980 | Fat16_Deinit(); |
975 | Fat16_Deinit(); |
981 | return(0); |
976 | return(0); |
982 | } |
977 | } |
983 | } |
978 | } |
984 | else // last cluster of the file is undefined |
979 | else // last cluster of the file is undefined |
985 | { // then the new cluster must be the first one of the file |
980 | { // then the new cluster must be the first one of the file |
986 | // and its cluster number must be set in the direntry |
981 | // and its cluster number must be set in the direntry |
987 | DirEntry_t * dir; |
982 | DirEntry_t * dir; |
988 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
983 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
989 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
984 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
990 | { |
985 | { |
991 | Fat16_Deinit(); |
986 | Fat16_Deinit(); |
992 | return(CLUSTER_UNDEFINED); |
987 | return(CLUSTER_UNDEFINED); |
993 | } |
988 | } |
994 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
989 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
995 | dir[file->DirectoryIndex].Res1 = 0; |
990 | dir[file->DirectoryIndex].Res1 = 0; |
996 | dir[file->DirectoryIndex].Res2[0] = 0; |
991 | dir[file->DirectoryIndex].Res2[0] = 0; |
997 | dir[file->DirectoryIndex].Res2[1] = 0; |
992 | dir[file->DirectoryIndex].Res2[1] = 0; |
998 | dir[file->DirectoryIndex].StartCluster = new_cluster; // update startcluster |
993 | dir[file->DirectoryIndex].StartCluster = new_cluster; // update startcluster |
999 | dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime);// set time |
994 | dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime);// set time |
1000 | dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime);// and date of modification |
995 | dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime);// and date of modification |
1001 | dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
996 | dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
1002 | dir[file->DirectoryIndex].Size = 0; |
997 | dir[file->DirectoryIndex].Size = 0; |
1003 | // write sector containing the direntry |
998 | // write sector containing the direntry |
1004 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
999 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
1005 | { |
1000 | { |
1006 | Fat16_Deinit(); |
1001 | Fat16_Deinit(); |
1007 | return(CLUSTER_UNDEFINED); |
1002 | return(CLUSTER_UNDEFINED); |
1008 | } |
1003 | } |
1009 | // update file info |
1004 | // update file info |
1010 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(new_cluster); |
1005 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(new_cluster); |
1011 | file->Size = 0; |
1006 | file->Size = 0; |
1012 | file->Position = 0; |
1007 | file->Position = 0; |
1013 | } |
1008 | } |
1014 | // update file pointes |
1009 | // update file pointes |
1015 | file->FirstSectorOfCurrCluster = Fat16ClusterToSector(new_cluster); |
1010 | file->FirstSectorOfCurrCluster = Fat16ClusterToSector(new_cluster); |
1016 | file->SectorOfCurrCluster = 0; |
1011 | file->SectorOfCurrCluster = 0; |
1017 | file->ByteOfCurrSector = 0; |
1012 | file->ByteOfCurrSector = 0; |
1018 | } |
1013 | } |
1019 | return(new_cluster); |
1014 | return(new_cluster); |
1020 | } |
1015 | } |
1021 | 1016 | ||
1022 | /****************************************************************************************************************************************************/ |
1017 | /****************************************************************************************************************************************************/ |
1023 | /* Function: DirectoryEntryExist(s8 *, u8, u8, File_t *) */ |
1018 | /* Function: DirectoryEntryExist(s8 *, u8, u8, File_t *) */ |
1024 | /* */ |
1019 | /* */ |
1025 | /* Description: This function searches all possible dir entries until the file or directory is found or the end of the directory is reached */ |
1020 | /* Description: This function searches all possible dir entries until the file or directory is found or the end of the directory is reached */ |
1026 | /* */ |
1021 | /* */ |
1027 | /* Returnvalue: This function returns 1 if the directory entry specified was found. */ |
1022 | /* Returnvalue: This function returns 1 if the directory entry specified was found. */ |
1028 | /****************************************************************************************************************************************************/ |
1023 | /****************************************************************************************************************************************************/ |
1029 | u8 DirectoryEntryExist(s8 *dirname, u8 attribfilter, u8 attribmask, File_t *file) |
1024 | u8 DirectoryEntryExist(s8 *dirname, u8 attribfilter, u8 attribmask, File_t *file) |
1030 | { |
1025 | { |
1031 | u32 dir_sector, max_dir_sector, curr_sector; |
1026 | u32 dir_sector, max_dir_sector, curr_sector; |
1032 | u16 dir_entry = 0; |
1027 | u16 dir_entry = 0; |
1033 | 1028 | ||
1034 | u16 end_of_directory_not_reached = 0; |
1029 | u16 end_of_directory_not_reached = 0; |
1035 | u8 i = 0; |
1030 | u8 i = 0; |
1036 | u8 direntry_exist = 0; |
1031 | u8 direntry_exist = 0; |
1037 | DirEntry_t * dir; |
1032 | DirEntry_t * dir; |
1038 | 1033 | ||
1039 | // if incomming pointers are useless return immediatly |
1034 | // if incomming pointers are useless return immediatly |
1040 | if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return(direntry_exist); |
1035 | if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return(direntry_exist); |
1041 | 1036 | ||
1042 | // dir entries can be searched only in filesclusters that have |
1037 | // dir entries can be searched only in filesclusters that have |
1043 | // a corresponding dir entry with adir-flag set in its attribute |
1038 | // a corresponding dir entry with adir-flag set in its attribute |
1044 | // or direct within the root directory area |
1039 | // or direct within the root directory area |
1045 | 1040 | ||
1046 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
1041 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
1047 | // no current directory exist therefore assume searching in the root |
1042 | // no current directory exist therefore assume searching in the root |
1048 | if(file->DirectorySector == SECTOR_UNDEFINED) |
1043 | if(file->DirectorySector == SECTOR_UNDEFINED) |
1049 | { |
1044 | { |
1050 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1045 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1051 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
1046 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
1052 | } |
1047 | } |
1053 | // within the root directory area we can read sectors sequentially until the end of this area |
1048 | // within the root directory area we can read sectors sequentially until the end of this area |
1054 | else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
1049 | else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
1055 | { |
1050 | { |
1056 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1051 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1057 | } |
1052 | } |
1058 | // within the data clusters we can read sectors sequentially only within the cluster |
1053 | // within the data clusters we can read sectors sequentially only within the cluster |
1059 | else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
1054 | else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
1060 | { |
1055 | { |
1061 | max_dir_sector = Partition.SectorsPerCluster; // limit max secters before next cluster |
1056 | max_dir_sector = Partition.SectorsPerCluster; // limit max secters before next cluster |
1062 | } |
1057 | } |
1063 | else return (direntry_exist); // bad sector range for directory sector of the file |
1058 | else return (direntry_exist); // bad sector range for directory sector of the file |
1064 | // if search area is not defined yet |
1059 | // if search area is not defined yet |
1065 | if(file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED) |
1060 | if(file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED) |
1066 | { |
1061 | { |
1067 | // check if the directory entry of current file is existent and has the dir-flag set |
1062 | // check if the directory entry of current file is existent and has the dir-flag set |
1068 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
1063 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
1069 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1064 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1070 | { |
1065 | { |
1071 | Fat16_Deinit(); |
1066 | Fat16_Deinit(); |
1072 | return(direntry_exist); |
1067 | return(direntry_exist); |
1073 | } |
1068 | } |
1074 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1069 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1075 | switch((u8)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
1070 | switch((u8)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
1076 | { |
1071 | { |
1077 | case SLOT_EMPTY: |
1072 | case SLOT_EMPTY: |
1078 | case SLOT_DELETED: |
1073 | case SLOT_DELETED: |
1079 | // the directrory pointer of this file points to a deleted or not existen directory |
1074 | // the directrory pointer of this file points to a deleted or not existen directory |
1080 | // therefore no file or subdirectory can be created |
1075 | // therefore no file or subdirectory can be created |
1081 | return (direntry_exist); |
1076 | return (direntry_exist); |
1082 | break; |
1077 | break; |
1083 | default: // and is a real directory |
1078 | default: // and is a real directory |
1084 | if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
1079 | if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
1085 | { // current file is not a directory therefore no file or subdirectory can be created here |
1080 | { // current file is not a directory therefore no file or subdirectory can be created here |
1086 | return (direntry_exist); |
1081 | return (direntry_exist); |
1087 | } |
1082 | } |
1088 | break; |
1083 | break; |
1089 | } |
1084 | } |
1090 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[file->DirectoryIndex].StartCluster); |
1085 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[file->DirectoryIndex].StartCluster); |
1091 | } |
1086 | } |
1092 | 1087 | ||
1093 | // update current file data area position to start of first cluster |
1088 | // update current file data area position to start of first cluster |
1094 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1089 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1095 | file->SectorOfCurrCluster = 0; |
1090 | file->SectorOfCurrCluster = 0; |
1096 | file->ByteOfCurrSector = 0; |
1091 | file->ByteOfCurrSector = 0; |
1097 | 1092 | ||
1098 | do // loop over all data clusters of the current directory entry |
1093 | do // loop over all data clusters of the current directory entry |
1099 | { |
1094 | { |
1100 | dir_sector = 0; // reset sector counter within a new cluster |
1095 | dir_sector = 0; // reset sector counter within a new cluster |
1101 | do // loop over all sectors of a cluster or all sectors of the root directory |
1096 | do // loop over all sectors of a cluster or all sectors of the root directory |
1102 | { |
1097 | { |
1103 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
1098 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
1104 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
1099 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
1105 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read the sector |
1100 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read the sector |
1106 | { |
1101 | { |
1107 | Fat16_Deinit(); |
1102 | Fat16_Deinit(); |
1108 | return(direntry_exist); |
1103 | return(direntry_exist); |
1109 | } |
1104 | } |
1110 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1105 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1111 | // search all directory entries within that sector |
1106 | // search all directory entries within that sector |
1112 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
1107 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
1113 | { // check for existing dir entry |
1108 | { // check for existing dir entry |
1114 | switch((u8)dir[dir_entry].Name[0]) |
1109 | switch((u8)dir[dir_entry].Name[0]) |
1115 | { |
1110 | { |
1116 | case SLOT_EMPTY: |
1111 | case SLOT_EMPTY: |
1117 | case SLOT_DELETED: |
1112 | case SLOT_DELETED: |
1118 | // ignore empty or deleted dir entries |
1113 | // ignore empty or deleted dir entries |
1119 | break; |
1114 | break; |
1120 | default: |
1115 | default: |
1121 | // if existing check attributes before names are compared will safe performance |
1116 | // if existing check attributes before names are compared will safe performance |
1122 | if ((dir[dir_entry].Attribute & attribmask) != attribfilter) break; // attribute must match |
1117 | if ((dir[dir_entry].Attribute & attribmask) != attribfilter) break; // attribute must match |
1123 | // then compare the name to the giveb dirname (first 11 characters include 8 chars of basename and 3 chars extension.) |
1118 | // then compare the name to the giveb dirname (first 11 characters include 8 chars of basename and 3 chars extension.) |
1124 | i = 0; |
1119 | i = 0; |
1125 | while((i < 11) && (dir[dir_entry].Name[i] == dirname[i])) i++; |
1120 | while((i < 11) && (dir[dir_entry].Name[i] == dirname[i])) i++; |
1126 | if (i < 10) break; // names does not match |
1121 | if (i < 10) break; // names does not match |
1127 | // if dirname and attribute have matched |
1122 | // if dirname and attribute have matched |
1128 | file->Attribute = dir[dir_entry].Attribute; // store attribute of found dir entry |
1123 | file->Attribute = dir[dir_entry].Attribute; // store attribute of found dir entry |
1129 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[dir_entry].StartCluster); // set sector of first data cluster |
1124 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[dir_entry].StartCluster); // set sector of first data cluster |
1130 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1125 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1131 | file->SectorOfCurrCluster = 0; |
1126 | file->SectorOfCurrCluster = 0; |
1132 | file->ByteOfCurrSector = 0; |
1127 | file->ByteOfCurrSector = 0; |
1133 | file->DirectorySector = curr_sector; // current sector |
1128 | file->DirectorySector = curr_sector; // current sector |
1134 | file->DirectoryIndex = dir_entry; // current direntry in current sector |
1129 | file->DirectoryIndex = dir_entry; // current direntry in current sector |
1135 | file->Size = dir[dir_entry].Size; |
1130 | file->Size = dir[dir_entry].Size; |
1136 | direntry_exist = 1; // mark as found |
1131 | direntry_exist = 1; // mark as found |
1137 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
1132 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
1138 | } // end of first byte of name check |
1133 | } // end of first byte of name check |
1139 | } |
1134 | } |
1140 | dir_sector++; // search next sector |
1135 | dir_sector++; // search next sector |
1141 | // stop if we reached the end of the cluster or the end of the root dir |
1136 | // stop if we reached the end of the cluster or the end of the root dir |
1142 | }while((dir_sector < max_dir_sector) && (!direntry_exist)); |
1137 | }while((dir_sector < max_dir_sector) && (!direntry_exist)); |
1143 | 1138 | ||
1144 | // if we are seaching in the data area and the file not found in this cluster so take next cluster. |
1139 | // if we are seaching in the data area and the file not found in this cluster so take next cluster. |
1145 | if(!direntry_exist && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
1140 | if(!direntry_exist && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
1146 | { |
1141 | { |
1147 | end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
1142 | end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
1148 | } |
1143 | } |
1149 | }while((end_of_directory_not_reached) && (!direntry_exist)); // repeat until a next cluster exist an no |
1144 | }while((end_of_directory_not_reached) && (!direntry_exist)); // repeat until a next cluster exist an no |
1150 | return(direntry_exist); |
1145 | return(direntry_exist); |
1151 | } |
1146 | } |
1152 | 1147 | ||
1153 | 1148 | ||
1154 | /****************************************************************************************************************************************/ |
1149 | /****************************************************************************************************************************************/ |
1155 | /* Function: CreateDirectoryEntry(s8 *, u16, File_t *) */ |
1150 | /* Function: CreateDirectoryEntry(s8 *, u16, File_t *) */ |
1156 | /* */ |
1151 | /* */ |
1157 | /* Description: This function looks for the next free position in the directory and creates an entry. */ |
1152 | /* Description: This function looks for the next free position in the directory and creates an entry. */ |
1158 | /* The type of an directory entry is specified by the file attribute. */ |
1153 | /* The type of an directory entry is specified by the file attribute. */ |
1159 | /* */ |
1154 | /* */ |
1160 | /* Returnvalue: Return 0 on error */ |
1155 | /* Returnvalue: Return 0 on error */ |
1161 | /****************************************************************************************************************************************/ |
1156 | /****************************************************************************************************************************************/ |
1162 | u8 CreateDirectoryEntry(s8 *dirname, u8 attrib, File_t *file) |
1157 | u8 CreateDirectoryEntry(s8 *dirname, u8 attrib, File_t *file) |
1163 | { |
1158 | { |
1164 | u32 dir_sector, max_dir_sector, curr_sector; |
1159 | u32 dir_sector, max_dir_sector, curr_sector; |
1165 | u16 dir_entry = 0; |
1160 | u16 dir_entry = 0; |
1166 | u16 subdircluster, dircluster = 0; |
1161 | u16 subdircluster, dircluster = 0; |
1167 | u16 end_of_directory_not_reached = 0; |
1162 | u16 end_of_directory_not_reached = 0; |
1168 | u8 i = 0; |
1163 | u8 i = 0; |
1169 | u8 retvalue = 0; |
1164 | u8 retvalue = 0; |
1170 | DirEntry_t *dir; |
1165 | DirEntry_t *dir; |
1171 | 1166 | ||
1172 | if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return (retvalue); |
1167 | if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return (retvalue); |
1173 | // It is not checked here that the dir entry that should be created is already existent! |
1168 | // It is not checked here that the dir entry that should be created is already existent! |
1174 | 1169 | ||
1175 | // Dir entries can be created only in file-clusters that have |
1170 | // Dir entries can be created only in file-clusters that have |
1176 | // the dir-flag set in its attribute or within the root directory |
1171 | // the dir-flag set in its attribute or within the root directory |
1177 | 1172 | ||
1178 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
1173 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
1179 | // no current directory exist therefore assume creating in the root |
1174 | // no current directory exist therefore assume creating in the root |
1180 | if(file->DirectorySector == SECTOR_UNDEFINED) |
1175 | if(file->DirectorySector == SECTOR_UNDEFINED) |
1181 | { |
1176 | { |
1182 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1177 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1183 | dircluster = 0; |
1178 | dircluster = 0; |
1184 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
1179 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
1185 | } |
1180 | } |
1186 | // within the root directory area we can read sectors sequentially until the end of this area |
1181 | // within the root directory area we can read sectors sequentially until the end of this area |
1187 | else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
1182 | else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
1188 | { |
1183 | { |
1189 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1184 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1190 | } |
1185 | } |
1191 | // within the data clusters we can read sectors sequentially only within the cluster |
1186 | // within the data clusters we can read sectors sequentially only within the cluster |
1192 | else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
1187 | else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
1193 | { |
1188 | { |
1194 | max_dir_sector = Partition.SectorsPerCluster; |
1189 | max_dir_sector = Partition.SectorsPerCluster; |
1195 | } |
1190 | } |
1196 | else return (retvalue); // bad sector range for directory sector of the file |
1191 | else return (retvalue); // bad sector range for directory sector of the file |
1197 | // if search area is not defined yet |
1192 | // if search area is not defined yet |
1198 | if(file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED) |
1193 | if(file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED) |
1199 | { |
1194 | { |
1200 | // check if the directory entry of current file is existent and has the dir-flag set |
1195 | // check if the directory entry of current file is existent and has the dir-flag set |
1201 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
1196 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
1202 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1197 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1203 | { |
1198 | { |
1204 | Fat16_Deinit(); |
1199 | Fat16_Deinit(); |
1205 | return(retvalue); |
1200 | return(retvalue); |
1206 | } |
1201 | } |
1207 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1202 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1208 | switch((u8)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
1203 | switch((u8)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
1209 | { |
1204 | { |
1210 | case SLOT_EMPTY: |
1205 | case SLOT_EMPTY: |
1211 | case SLOT_DELETED: |
1206 | case SLOT_DELETED: |
1212 | return (retvalue); |
1207 | return (retvalue); |
1213 | break; |
1208 | break; |
1214 | default: // and is a real directory |
1209 | default: // and is a real directory |
1215 | if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
1210 | if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
1216 | { // current file is not a directory therefore no file or subdirectory can be created here |
1211 | { // current file is not a directory therefore no file or subdirectory can be created here |
1217 | return (retvalue); |
1212 | return (retvalue); |
1218 | } |
1213 | } |
1219 | break; |
1214 | break; |
1220 | } |
1215 | } |
1221 | dircluster = dir[file->DirectoryIndex].StartCluster; |
1216 | dircluster = dir[file->DirectoryIndex].StartCluster; |
1222 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dircluster); |
1217 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dircluster); |
1223 | } |
1218 | } |
1224 | 1219 | ||
1225 | // if the new direntry is a subdirectory |
1220 | // if the new direntry is a subdirectory |
1226 | if((attrib & ATTR_SUBDIRECTORY) == ATTR_SUBDIRECTORY) |
1221 | if((attrib & ATTR_SUBDIRECTORY) == ATTR_SUBDIRECTORY) |
1227 | { // get a free clutser for its content |
1222 | { // get a free clutser for its content |
1228 | subdircluster = FindNextFreeCluster(file); // get the next free cluster on the disk and mark it as used. |
1223 | subdircluster = FindNextFreeCluster(file); // get the next free cluster on the disk and mark it as used. |
1229 | } |
1224 | } |
1230 | else // a normal file |
1225 | else // a normal file |
1231 | { // has no data cluster after creation |
1226 | { // has no data cluster after creation |
1232 | subdircluster = CLUSTER_UNDEFINED; |
1227 | subdircluster = CLUSTER_UNDEFINED; |
1233 | } |
1228 | } |
1234 | 1229 | ||
1235 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1230 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1236 | file->SectorOfCurrCluster = 0; |
1231 | file->SectorOfCurrCluster = 0; |
1237 | do // loop over all clusters of current directory |
1232 | do // loop over all clusters of current directory |
1238 | { |
1233 | { |
1239 | dir_sector = 0; // reset sector counter within a new cluster |
1234 | dir_sector = 0; // reset sector counter within a new cluster |
1240 | do // loop over all sectors of a cluster or all sectors of the root directory |
1235 | do // loop over all sectors of a cluster or all sectors of the root directory |
1241 | { |
1236 | { |
1242 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
1237 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
1243 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
1238 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
1244 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1239 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1245 | { |
1240 | { |
1246 | Fat16_Deinit(); |
1241 | Fat16_Deinit(); |
1247 | return(retvalue); |
1242 | return(retvalue); |
1248 | } |
1243 | } |
1249 | 1244 | ||
1250 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1245 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1251 | // search all directory entries of a sector |
1246 | // search all directory entries of a sector |
1252 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
1247 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
1253 | { // check if current direntry is available |
1248 | { // check if current direntry is available |
1254 | if(((u8)dir[dir_entry].Name[0] == SLOT_EMPTY) || ((u8)dir[dir_entry].Name[0] == SLOT_DELETED)) |
1249 | if(((u8)dir[dir_entry].Name[0] == SLOT_EMPTY) || ((u8)dir[dir_entry].Name[0] == SLOT_DELETED)) |
1255 | { // a free direntry was found |
1250 | { // a free direntry was found |
1256 | for(i = 0; i < 11; i++) dir[dir_entry].Name[i] = dirname[i]; // Set dir name |
1251 | for(i = 0; i < 11; i++) dir[dir_entry].Name[i] = dirname[i]; // Set dir name |
1257 | dir[dir_entry].Attribute = attrib; |
1252 | dir[dir_entry].Attribute = attrib; |
1258 | dir[dir_entry].Res1 = 0; |
1253 | dir[dir_entry].Res1 = 0; |
1259 | dir[dir_entry].CreationTime10ms = (u8)(SystemTime.mSec/10); |
1254 | dir[dir_entry].CreationTime10ms = (u8)(SystemTime.mSec/10); |
1260 | dir[dir_entry].CreationTime = FileTime(&SystemTime); |
1255 | dir[dir_entry].CreationTime = FileTime(&SystemTime); |
1261 | dir[dir_entry].CreationDate = FileDate(&SystemTime); |
1256 | dir[dir_entry].CreationDate = FileDate(&SystemTime); |
1262 | dir[dir_entry].LastAccessDate = dir[dir_entry].CreationDate; |
1257 | dir[dir_entry].LastAccessDate = dir[dir_entry].CreationDate; |
1263 | dir[dir_entry].Res2[0] = 0; |
1258 | dir[dir_entry].Res2[0] = 0; |
1264 | dir[dir_entry].Res2[1] = 0; |
1259 | dir[dir_entry].Res2[1] = 0; |
1265 | dir[dir_entry].ModTime = dir[dir_entry].CreationTime; |
1260 | dir[dir_entry].ModTime = dir[dir_entry].CreationTime; |
1266 | dir[dir_entry].ModDate = dir[dir_entry].CreationDate; |
1261 | dir[dir_entry].ModDate = dir[dir_entry].CreationDate; |
1267 | // Set the attribute of the new directoryentry. |
1262 | // Set the attribute of the new directoryentry. |
1268 | dir[dir_entry].StartCluster = subdircluster; // copy the location of the first datacluster to the directoryentry. |
1263 | dir[dir_entry].StartCluster = subdircluster; // copy the location of the first datacluster to the directoryentry. |
1269 | dir[dir_entry].Size = 0; // the new createted file has no content yet. |
1264 | dir[dir_entry].Size = 0; // the new createted file has no content yet. |
1270 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to card |
1265 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to card |
1271 | { |
1266 | { |
1272 | Fat16_Deinit(); |
1267 | Fat16_Deinit(); |
1273 | return(retvalue); |
1268 | return(retvalue); |
1274 | } |
1269 | } |
1275 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(subdircluster); // Calculate absolute sectorposition of first datacluster. |
1270 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(subdircluster); // Calculate absolute sectorposition of first datacluster. |
1276 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; // Start reading the file with the first sector of the first datacluster. |
1271 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; // Start reading the file with the first sector of the first datacluster. |
1277 | file->SectorOfCurrCluster = 0; // reset sector of cureen cluster |
1272 | file->SectorOfCurrCluster = 0; // reset sector of cureen cluster |
1278 | file->ByteOfCurrSector = 0; // reset the byte location within the current sector |
1273 | file->ByteOfCurrSector = 0; // reset the byte location within the current sector |
1279 | file->Attribute = attrib; // set file attribute to dir attribute |
1274 | file->Attribute = attrib; // set file attribute to dir attribute |
1280 | file->Size = 0; // new file has no size |
1275 | file->Size = 0; // new file has no size |
1281 | file->DirectorySector = curr_sector; |
1276 | file->DirectorySector = curr_sector; |
1282 | file->DirectoryIndex = dir_entry; |
1277 | file->DirectoryIndex = dir_entry; |
1283 | // prepare subdirectory data cluster |
1278 | // prepare subdirectory data cluster |
1284 | if((attrib & ATTR_SUBDIRECTORY) == ATTR_SUBDIRECTORY) // if a new directory was created then initilize the data area |
1279 | if((attrib & ATTR_SUBDIRECTORY) == ATTR_SUBDIRECTORY) // if a new directory was created then initilize the data area |
1285 | { |
1280 | { |
1286 | ClearCurrCluster(file); // fill cluster with zeros |
1281 | ClearCurrCluster(file); // fill cluster with zeros |
1287 | file->SectorInCache = file->FirstSectorOfFirstCluster; |
1282 | file->SectorInCache = file->FirstSectorOfFirstCluster; |
1288 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1283 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1289 | { |
1284 | { |
1290 | Fat16_Deinit(); |
1285 | Fat16_Deinit(); |
1291 | return(retvalue); |
1286 | return(retvalue); |
1292 | } |
1287 | } |
1293 | dir = (DirEntry_t *)file->Cache; |
1288 | dir = (DirEntry_t *)file->Cache; |
1294 | // create direntry "." to current dir |
1289 | // create direntry "." to current dir |
1295 | dir[0].Name[0] = 0x2E; |
1290 | dir[0].Name[0] = 0x2E; |
1296 | for(i = 1; i < 11; i++) dir[0].Name[i] = ' '; |
1291 | for(i = 1; i < 11; i++) dir[0].Name[i] = ' '; |
1297 | dir[0].Attribute = ATTR_SUBDIRECTORY; |
1292 | dir[0].Attribute = ATTR_SUBDIRECTORY; |
1298 | dir[0].StartCluster = subdircluster; |
1293 | dir[0].StartCluster = subdircluster; |
1299 | dir[0].Size = 0; |
1294 | dir[0].Size = 0; |
1300 | // create direntry ".." to the upper dir |
1295 | // create direntry ".." to the upper dir |
1301 | dir[1].Name[0] = 0x2E; |
1296 | dir[1].Name[0] = 0x2E; |
1302 | dir[1].Name[1] = 0x2E; |
1297 | dir[1].Name[1] = 0x2E; |
1303 | for(i = 2; i < 11; i++) dir[1].Name[i] = ' '; |
1298 | for(i = 2; i < 11; i++) dir[1].Name[i] = ' '; |
1304 | dir[1].Attribute = ATTR_SUBDIRECTORY; |
1299 | dir[1].Attribute = ATTR_SUBDIRECTORY; |
1305 | dir[1].StartCluster = dircluster; |
1300 | dir[1].StartCluster = dircluster; |
1306 | dir[1].Size = 0; |
1301 | dir[1].Size = 0; |
1307 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// read in the sector. |
1302 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// read in the sector. |
1308 | { |
1303 | { |
1309 | Fat16_Deinit(); |
1304 | Fat16_Deinit(); |
1310 | return(retvalue); |
1305 | return(retvalue); |
1311 | } |
1306 | } |
1312 | } |
1307 | } |
1313 | retvalue = 1; |
1308 | retvalue = 1; |
1314 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
1309 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
1315 | } |
1310 | } |
1316 | } |
1311 | } |
1317 | dir_sector++; // search next sector |
1312 | dir_sector++; // search next sector |
1318 | // stop if we reached the end of the cluster or the end of the root dir |
1313 | // stop if we reached the end of the cluster or the end of the root dir |
1319 | }while((dir_sector < max_dir_sector) && (!retvalue)); |
1314 | }while((dir_sector < max_dir_sector) && (!retvalue)); |
1320 | 1315 | ||
1321 | // if we are seaching in the data area and the file not found in this cluster so take next cluster. |
1316 | // if we are seaching in the data area and the file not found in this cluster so take next cluster. |
1322 | if(!retvalue && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
1317 | if(!retvalue && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
1323 | { |
1318 | { |
1324 | end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
1319 | end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
1325 | } |
1320 | } |
1326 | }while((end_of_directory_not_reached) && (!retvalue)); |
1321 | }while((end_of_directory_not_reached) && (!retvalue)); |
1327 | // Perhaps we are at the end of the last cluster of a directory file and have no free direntry found. |
1322 | // Perhaps we are at the end of the last cluster of a directory file and have no free direntry found. |
1328 | // Then we would need to add a cluster to that file and create the new direntry there. |
1323 | // Then we would need to add a cluster to that file and create the new direntry there. |
1329 | // This code is not implemented yet, because its occurs only if more that 32*32=1024 direntries are |
1324 | // This code is not implemented yet, because its occurs only if more that 32*32=1024 direntries are |
1330 | // within a subdirectory of root. |
1325 | // within a subdirectory of root. |
1331 | 1326 | ||
1332 | return(retvalue); // return 1 if file has been created otherwise return 0. |
1327 | return(retvalue); // return 1 if file has been created otherwise return 0. |
1333 | } |
1328 | } |
1334 | 1329 | ||
1335 | /********************************************************************************************************************************************/ |
1330 | /********************************************************************************************************************************************/ |
1336 | /* Function: FileExist(const s8* filename, u8 attribfilter, u8 attribmask, File_t *file); */ |
1331 | /* Function: FileExist(const s8* filename, u8 attribfilter, u8 attribmask, File_t *file); */ |
1337 | /* */ |
1332 | /* */ |
1338 | /* Description: This function looks for the specified file including its subdirectories beginning */ |
1333 | /* Description: This function looks for the specified file including its subdirectories beginning */ |
1339 | /* in the rootdirectory of the drive. If the file is found the Filepointer properties are */ |
1334 | /* in the rootdirectory of the drive. If the file is found the Filepointer properties are */ |
1340 | /* updated. */ |
1335 | /* updated. */ |
1341 | /* */ |
1336 | /* */ |
1342 | /* Returnvalue: 1 if file is found else 0. */ |
1337 | /* Returnvalue: 1 if file is found else 0. */ |
1343 | /********************************************************************************************************************************************/ |
1338 | /********************************************************************************************************************************************/ |
1344 | u8 FileExist(const s8* filename, const u8 attribfilter, const u8 attribmask, File_t *file) |
1339 | u8 FileExist(const s8* filename, const u8 attribfilter, const u8 attribmask, File_t *file) |
1345 | { |
1340 | { |
1346 | s8* path = 0; |
1341 | s8* path = 0; |
1347 | s8* subpath = 0; |
1342 | s8* subpath = 0; |
1348 | u8 af, am, file_exist = 0; |
1343 | u8 af, am, file_exist = 0; |
1349 | s8 dirname[12]; // 8+3 + temination character |
1344 | s8 dirname[12]; // 8+3 + temination character |
1350 | 1345 | ||
1351 | // if incomming pointers are useless return immediatly |
1346 | // if incomming pointers are useless return immediatly |
1352 | if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
1347 | if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
1353 | 1348 | ||
1354 | // trace along the filepath |
1349 | // trace along the filepath |
1355 | path = (s8*)filename; // start a the beginning of the filename string |
1350 | path = (s8*)filename; // start a the beginning of the filename string |
1356 | file->DirectorySector = 0; // start at RootDirectory with file search |
1351 | file->DirectorySector = 0; // start at RootDirectory with file search |
1357 | file->DirectoryIndex = 0; |
1352 | file->DirectoryIndex = 0; |
1358 | // as long as the file was not found and the remaining path is not empty |
1353 | // as long as the file was not found and the remaining path is not empty |
1359 | while((*path != 0) && !file_exist) |
1354 | while((*path != 0) && !file_exist) |
1360 | { // separate dirname and subpath from filepath string |
1355 | { // separate dirname and subpath from filepath string |
1361 | subpath = SeperateDirName(path, dirname); |
1356 | subpath = SeperateDirName(path, dirname); |
1362 | if(subpath != NULL) |
1357 | if(subpath != NULL) |
1363 | { |
1358 | { |
1364 | if(*subpath == 0) |
1359 | if(*subpath == 0) |
1365 | { // empty subpath indicates last element of dir chain |
1360 | { // empty subpath indicates last element of dir chain |
1366 | af = attribfilter; |
1361 | af = attribfilter; |
1367 | am = attribmask; |
1362 | am = attribmask; |
1368 | } |
1363 | } |
1369 | else // it must be a subdirectory and no volume label |
1364 | else // it must be a subdirectory and no volume label |
1370 | { |
1365 | { |
1371 | af = ATTR_SUBDIRECTORY; |
1366 | af = ATTR_SUBDIRECTORY; |
1372 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
1367 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
1373 | } |
1368 | } |
1374 | if(!DirectoryEntryExist(dirname, af, am, file)) |
1369 | if(!DirectoryEntryExist(dirname, af, am, file)) |
1375 | { |
1370 | { |
1376 | return (file_exist); // subdirectory does not exist |
1371 | return (file_exist); // subdirectory does not exist |
1377 | } |
1372 | } |
1378 | else |
1373 | else |
1379 | { |
1374 | { |
1380 | if (*subpath == 0) |
1375 | if (*subpath == 0) |
1381 | { |
1376 | { |
1382 | file_exist = 1; // last element of path chain was found with the given attribute filter |
1377 | file_exist = 1; // last element of path chain was found with the given attribute filter |
1383 | } |
1378 | } |
1384 | } |
1379 | } |
1385 | } |
1380 | } |
1386 | else // error seperating the subpath |
1381 | else // error seperating the subpath |
1387 | { |
1382 | { |
1388 | return file_exist; // bad subdir format |
1383 | return file_exist; // bad subdir format |
1389 | } |
1384 | } |
1390 | path = subpath; |
1385 | path = subpath; |
1391 | subpath = 0; |
1386 | subpath = 0; |
1392 | } |
1387 | } |
1393 | return (file_exist); |
1388 | return (file_exist); |
1394 | } |
1389 | } |
1395 | 1390 | ||
1396 | 1391 | ||
1397 | /********************************************************************************************************************************************/ |
1392 | /********************************************************************************************************************************************/ |
1398 | /* Function: FileCreate(const s8* filename, u8 attrib, File_t *file); */ |
1393 | /* Function: FileCreate(const s8* filename, u8 attrib, File_t *file); */ |
1399 | /* */ |
1394 | /* */ |
1400 | /* Description: This function looks for the specified file including its subdirectories beginning */ |
1395 | /* Description: This function looks for the specified file including its subdirectories beginning */ |
1401 | /* in the rootdirectory of the partition. If the file is found the Filepointer properties are */ |
1396 | /* in the rootdirectory of the partition. If the file is found the Filepointer properties are */ |
1402 | /* updated. If file or its subdirectories are not found they will be created */ |
1397 | /* updated. If file or its subdirectories are not found they will be created */ |
1403 | /* */ |
1398 | /* */ |
1404 | /* Returnvalue: 1 if file was created else 0. */ |
1399 | /* Returnvalue: 1 if file was created else 0. */ |
1405 | /********************************************************************************************************************************************/ |
1400 | /********************************************************************************************************************************************/ |
1406 | u8 FileCreate(const s8* filename, const u8 attrib, File_t *file) |
1401 | u8 FileCreate(const s8* filename, const u8 attrib, File_t *file) |
1407 | { |
1402 | { |
1408 | s8 *path = 0; |
1403 | s8 *path = 0; |
1409 | s8 *subpath = 0; |
1404 | s8 *subpath = 0; |
1410 | u8 af, am, file_created = 0; |
1405 | u8 af, am, file_created = 0; |
1411 | s8 dirname[12]; |
1406 | s8 dirname[12]; |
1412 | 1407 | ||
1413 | // if incomming pointers are useless return immediatly |
1408 | // if incomming pointers are useless return immediatly |
1414 | if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
1409 | if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
1415 | 1410 | ||
1416 | // trace along the filepath |
1411 | // trace along the filepath |
1417 | path = (s8*)filename; // start a the beginning of the filename string |
1412 | path = (s8*)filename; // start a the beginning of the filename string |
1418 | file->DirectorySector = 0; // start at RootDirectory with file search |
1413 | file->DirectorySector = 0; // start at RootDirectory with file search |
1419 | file->DirectoryIndex = 0; |
1414 | file->DirectoryIndex = 0; |
1420 | // as long as the file was not created and the remaining file path is not empty |
1415 | // as long as the file was not created and the remaining file path is not empty |
1421 | while((*path != 0) && !file_created) |
1416 | while((*path != 0) && !file_created) |
1422 | { // separate dirname and subpath from filepath string |
1417 | { // separate dirname and subpath from filepath string |
1423 | subpath = SeperateDirName(path, dirname); |
1418 | subpath = SeperateDirName(path, dirname); |
1424 | if(subpath != NULL) |
1419 | if(subpath != NULL) |
1425 | { |
1420 | { |
1426 | if(*subpath == 0) |
1421 | if(*subpath == 0) |
1427 | { // empty subpath indicates last element of dir chain |
1422 | { // empty subpath indicates last element of dir chain |
1428 | af = ATTR_NONE; |
1423 | af = ATTR_NONE; |
1429 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; // any file that is no subdir or volume label |
1424 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; // any file that is no subdir or volume label |
1430 | } |
1425 | } |
1431 | else // it must be a subdirectory and no volume label |
1426 | else // it must be a subdirectory and no volume label |
1432 | { |
1427 | { |
1433 | af = ATTR_SUBDIRECTORY; |
1428 | af = ATTR_SUBDIRECTORY; |
1434 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
1429 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
1435 | } |
1430 | } |
1436 | if(!DirectoryEntryExist(dirname, af, am, file)) // if subdir or file is not existent |
1431 | if(!DirectoryEntryExist(dirname, af, am, file)) // if subdir or file is not existent |
1437 | { // try to create subdir or file |
1432 | { // try to create subdir or file |
1438 | if(*subpath == 0) af = attrib; // if last element in dir chain take the given attribute |
1433 | if(*subpath == 0) af = attrib; // if last element in dir chain take the given attribute |
1439 | if(!CreateDirectoryEntry(dirname, af, file)) |
1434 | if(!CreateDirectoryEntry(dirname, af, file)) |
1440 | { // could not be created |
1435 | { // could not be created |
1441 | return(file_created); |
1436 | return(file_created); |
1442 | } |
1437 | } |
1443 | else if (*subpath == 0) file_created = 1; // last element of path chain was created |
1438 | else if (*subpath == 0) file_created = 1; // last element of path chain was created |
1444 | } |
1439 | } |
1445 | } |
1440 | } |
1446 | else // error seperating the subpath |
1441 | else // error seperating the subpath |
1447 | { |
1442 | { |
1448 | return file_created; // bad subdir format |
1443 | return file_created; // bad subdir format |
1449 | } |
1444 | } |
1450 | path = subpath; |
1445 | path = subpath; |
1451 | subpath = 0; |
1446 | subpath = 0; |
1452 | } |
1447 | } |
1453 | return (file_created); |
1448 | return (file_created); |
1454 | } |
1449 | } |
1455 | 1450 | ||
1456 | 1451 | ||
1457 | /********************************************************************************************************************************************/ |
1452 | /********************************************************************************************************************************************/ |
1458 | /* Function: File_t * fopen_(s8* filename, s8 mode); */ |
1453 | /* Function: File_t * fopen_(s8* filename, s8 mode); */ |
1459 | /* */ |
1454 | /* */ |
1460 | /* Description: This function looks for the specified file in the rootdirectory of the drive. If the file is found the number of the */ |
1455 | /* Description: This function looks for the specified file in the rootdirectory of the drive. If the file is found the number of the */ |
1461 | /* corrosponding filepointer is returned. Only modes 'r' (reading) and 'a' append are implemented yet. */ |
1456 | /* corrosponding filepointer is returned. Only modes 'r' (reading) and 'a' append are implemented yet. */ |
1462 | /* */ |
1457 | /* */ |
1463 | /* Returnvalue: The filepointer to the file or 0 if faild. */ |
1458 | /* Returnvalue: The filepointer to the file or 0 if faild. */ |
1464 | /********************************************************************************************************************************************/ |
1459 | /********************************************************************************************************************************************/ |
1465 | File_t * fopen_(s8 * const filename, const s8 mode) |
1460 | File_t * fopen_(s8 * const filename, const s8 mode) |
1466 | { |
1461 | { |
1467 | File_t *file = 0; |
1462 | File_t *file = 0; |
1468 | 1463 | ||
1469 | if((!Partition.IsValid) || (filename == 0)) return(file); |
1464 | if((!Partition.IsValid) || (filename == 0)) return(file); |
1470 | 1465 | ||
1471 | // Look for an unused filepointer in the file pointer list? |
1466 | // Look for an unused filepointer in the file pointer list? |
1472 | file = LockFilePointer(); |
1467 | file = LockFilePointer(); |
1473 | // if no unused file pointer was found return 0 |
1468 | // if no unused file pointer was found return 0 |
1474 | if(file == NULL) return(file); |
1469 | if(file == NULL) return(file); |
1475 | 1470 | ||
1476 | // now we have found a free filepointer and claimed it |
1471 | // now we have found a free filepointer and claimed it |
1477 | // so let initiate its property values |
1472 | // so let initiate its property values |
1478 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; // Sectorpointer to the first sector of the first datacluster of the file. |
1473 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; // Sectorpointer to the first sector of the first datacluster of the file. |
1479 | file->FirstSectorOfCurrCluster = SECTOR_UNDEFINED; // Pointer to the cluster which is edited at the moment. |
1474 | file->FirstSectorOfCurrCluster = SECTOR_UNDEFINED; // Pointer to the cluster which is edited at the moment. |
1480 | file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
1475 | file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
1481 | file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
1476 | file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
1482 | file->Mode = mode; // mode of fileoperation (read,write) |
1477 | file->Mode = mode; // mode of fileoperation (read,write) |
1483 | file->Size = 0; // the size of the opened file in bytes. |
1478 | file->Size = 0; // the size of the opened file in bytes. |
1484 | file->Position = 0; // pointer to a byte within the file 0 < fileposition < filesize |
1479 | file->Position = 0; // pointer to a byte within the file 0 < fileposition < filesize |
1485 | file->SectorInCache = SECTOR_UNDEFINED; // the last sector read, wich is still in the sectorbuffer. |
1480 | file->SectorInCache = SECTOR_UNDEFINED; // the last sector read, wich is still in the sectorbuffer. |
1486 | file->DirectorySector = SECTOR_UNDEFINED; // the sectorposition where the directoryentry has been made. |
1481 | file->DirectorySector = SECTOR_UNDEFINED; // the sectorposition where the directoryentry has been made. |
1487 | file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
1482 | file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
1488 | file->Attribute = 0; // the attribute of the file opened. |
1483 | file->Attribute = 0; // the attribute of the file opened. |
1489 | 1484 | ||
1490 | // check if a real file (no directory) to the given filename exist |
1485 | // check if a real file (no directory) to the given filename exist |
1491 | if(FileExist(filename, ATTR_NONE, ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL, file)) |
1486 | if(FileExist(filename, ATTR_NONE, ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL, file)) |
1492 | { // file exist |
1487 | { // file exist |
1493 | switch(mode) // check mode |
1488 | switch(mode) // check mode |
1494 | { |
1489 | { |
1495 | case 'a': // if mode is: append to file |
1490 | case 'a': // if mode is: append to file |
1496 | if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
1491 | if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
1497 | { // file is marked as readonly --> do not open this file |
1492 | { // file is marked as readonly --> do not open this file |
1498 | fclose_(file); |
1493 | fclose_(file); |
1499 | file = NULL; |
1494 | file = NULL; |
1500 | } |
1495 | } |
1501 | else |
1496 | else |
1502 | { // file is not marked as read only --> goto end of file |
1497 | { // file is not marked as read only --> goto end of file |
1503 | fseek_(file, 0, SEEK_END); // point to the end of the file |
1498 | fseek_(file, 0, SEEK_END); // point to the end of the file |
1504 | } |
1499 | } |
1505 | break; |
1500 | break; |
1506 | case 'w': // if mode is: write to file |
1501 | case 'w': // if mode is: write to file |
1507 | if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
1502 | if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
1508 | { // file is marked as readonly --> do not open this file |
1503 | { // file is marked as readonly --> do not open this file |
1509 | fclose_(file); |
1504 | fclose_(file); |
1510 | file = NULL; |
1505 | file = NULL; |
1511 | } |
1506 | } |
1512 | else |
1507 | else |
1513 | { // file is not marked as read only |
1508 | { // file is not marked as read only |
1514 | DirEntry_t * dir; |
1509 | DirEntry_t * dir; |
1515 | // free all clusters of that file |
1510 | // free all clusters of that file |
1516 | DeleteClusterChain(SectorToFat16Cluster(file->FirstSectorOfFirstCluster)); |
1511 | DeleteClusterChain(SectorToFat16Cluster(file->FirstSectorOfFirstCluster)); |
1517 | // update directory entry of that file |
1512 | // update directory entry of that file |
1518 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
1513 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
1519 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1514 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
1520 | { |
1515 | { |
1521 | Fat16_Deinit(); |
1516 | Fat16_Deinit(); |
1522 | return(NULL); |
1517 | return(NULL); |
1523 | } |
1518 | } |
1524 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1519 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
1525 | dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime); // set modification time |
1520 | dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime); // set modification time |
1526 | dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime); // set modification date |
1521 | dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime); // set modification date |
1527 | dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
1522 | dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
1528 | dir[file->DirectoryIndex].StartCluster = CLUSTER_UNDEFINED; // update startcluster |
1523 | dir[file->DirectoryIndex].StartCluster = CLUSTER_UNDEFINED; // update startcluster |
1529 | dir[file->DirectoryIndex].Size = 0; |
1524 | dir[file->DirectoryIndex].Size = 0; |
1530 | // write sector containing the direntry |
1525 | // write sector containing the direntry |
1531 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
1526 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
1532 | { |
1527 | { |
1533 | Fat16_Deinit(); |
1528 | Fat16_Deinit(); |
1534 | return(NULL); |
1529 | return(NULL); |
1535 | } |
1530 | } |
1536 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
1531 | file->FirstSectorOfFirstCluster = SECTOR_UNDEFINED; |
1537 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1532 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1538 | file->SectorOfCurrCluster = 0; |
1533 | file->SectorOfCurrCluster = 0; |
1539 | file->ByteOfCurrSector = 0; |
1534 | file->ByteOfCurrSector = 0; |
1540 | file->Size = 0; |
1535 | file->Size = 0; |
1541 | file->Position = 0; |
1536 | file->Position = 0; |
1542 | fseek_(file, 0, SEEK_SET); |
1537 | fseek_(file, 0, SEEK_SET); |
1543 | } |
1538 | } |
1544 | break; |
1539 | break; |
1545 | case 'r': // if mode is: read from file |
1540 | case 'r': // if mode is: read from file |
1546 | // goto end of file |
1541 | // goto end of file |
1547 | fseek_(file, 0, SEEK_SET); |
1542 | fseek_(file, 0, SEEK_SET); |
1548 | break; |
1543 | break; |
1549 | default: // other modes are not supported |
1544 | default: // other modes are not supported |
1550 | fclose_(file); |
1545 | fclose_(file); |
1551 | file = NULL; |
1546 | file = NULL; |
1552 | break; |
1547 | break; |
1553 | } |
1548 | } |
1554 | return(file); |
1549 | return(file); |
1555 | } |
1550 | } |
1556 | else // file does not exist |
1551 | else // file does not exist |
1557 | { |
1552 | { |
1558 | switch(mode) // check mode |
1553 | switch(mode) // check mode |
1559 | { |
1554 | { |
1560 | case 'a': |
1555 | case 'a': |
1561 | case 'w': // if mode is write or append |
1556 | case 'w': // if mode is write or append |
1562 | // try to create the file |
1557 | // try to create the file |
1563 | if(!FileCreate(filename, ATTR_ARCHIVE, file)) |
1558 | if(!FileCreate(filename, ATTR_ARCHIVE, file)) |
1564 | { // if it could not be created |
1559 | { // if it could not be created |
1565 | fclose_(file); |
1560 | fclose_(file); |
1566 | file = NULL; |
1561 | file = NULL; |
1567 | } |
1562 | } |
1568 | break; |
1563 | break; |
1569 | case 'r': // else opened for 'r' |
1564 | case 'r': // else opened for 'r' |
1570 | default: // if unsupported mode |
1565 | default: // if unsupported mode |
1571 | fclose_(file); |
1566 | fclose_(file); |
1572 | file = NULL; |
1567 | file = NULL; |
1573 | break; |
1568 | break; |
1574 | } |
1569 | } |
1575 | return(file); |
1570 | return(file); |
1576 | } |
1571 | } |
1577 | // we should never come to this point |
1572 | // we should never come to this point |
1578 | fclose_(file); |
1573 | fclose_(file); |
1579 | file = NULL; |
1574 | file = NULL; |
1580 | return(file); |
1575 | return(file); |
1581 | } |
1576 | } |
1582 | 1577 | ||
1583 | /****************************************************************************************************************************************************/ |
1578 | /****************************************************************************************************************************************************/ |
1584 | /* Function: fflush_(File *); */ |
1579 | /* Function: fflush_(File *); */ |
1585 | /* */ |
1580 | /* */ |
1586 | /* Description: This function writes the data already in the buffer but not yet written to the file. */ |
1581 | /* Description: This function writes the data already in the buffer but not yet written to the file. */ |
1587 | /* */ |
1582 | /* */ |
1588 | /* Returnvalue: 0 on success EOF on error */ |
1583 | /* Returnvalue: 0 on success EOF on error */ |
1589 | /****************************************************************************************************************************************************/ |
1584 | /****************************************************************************************************************************************************/ |
1590 | s16 fflush_(File_t *file) |
1585 | s16 fflush_(File_t *file) |
1591 | { |
1586 | { |
1592 | DirEntry_t *dir; |
1587 | DirEntry_t *dir; |
1593 | 1588 | ||
1594 | if((file == NULL) || (!Partition.IsValid)) return (EOF); |
1589 | if((file == NULL) || (!Partition.IsValid)) return (EOF); |
1595 | 1590 | ||
1596 | switch(file->Mode) |
1591 | switch(file->Mode) |
1597 | { |
1592 | { |
1598 | case 'a': |
1593 | case 'a': |
1599 | case 'w': |
1594 | case 'w': |
1600 | if(file->ByteOfCurrSector > 0) // has data been added to the file? |
1595 | if(file->ByteOfCurrSector > 0) // has data been added to the file? |
1601 | { |
1596 | { |
1602 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// save the data still in the buffer |
1597 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// save the data still in the buffer |
1603 | { |
1598 | { |
1604 | Fat16_Deinit(); |
1599 | Fat16_Deinit(); |
1605 | return(EOF); |
1600 | return(EOF); |
1606 | } |
1601 | } |
1607 | } |
1602 | } |
1608 | file->SectorInCache = file->DirectorySector; |
1603 | file->SectorInCache = file->DirectorySector; |
1609 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read the directory entry for this file. |
1604 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read the directory entry for this file. |
1610 | { |
1605 | { |
1611 | Fat16_Deinit(); |
1606 | Fat16_Deinit(); |
1612 | return(EOF); |
1607 | return(EOF); |
1613 | } |
1608 | } |
1614 | 1609 | ||
1615 | dir = (DirEntry_t *)file->Cache; |
1610 | dir = (DirEntry_t *)file->Cache; |
1616 | // update dile size and modification time & date |
1611 | // update file size and modification time & date |
1617 | dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime); |
1612 | dir[file->DirectoryIndex].ModTime = FileTime(&SystemTime); |
1618 | dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime); |
1613 | dir[file->DirectoryIndex].ModDate = FileDate(&SystemTime); |
1619 | dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
1614 | dir[file->DirectoryIndex].LastAccessDate = dir[file->DirectoryIndex].ModDate; |
1620 | dir[file->DirectoryIndex].Size = file->Size; // update file size |
1615 | dir[file->DirectoryIndex].Size = file->Size; // update file size |
1621 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to sd-card |
1616 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to sd-card |
1622 | { |
1617 | { |
1623 | Fat16_Deinit(); |
1618 | Fat16_Deinit(); |
1624 | return(EOF); |
1619 | return(EOF); |
1625 | } |
1620 | } |
1626 | break; |
1621 | break; |
1627 | case 'r': |
1622 | case 'r': |
1628 | default: |
1623 | default: |
1629 | // do nothing! |
1624 | // do nothing! |
1630 | return(EOF); |
1625 | return(EOF); |
1631 | break; |
1626 | break; |
1632 | 1627 | ||
1633 | } |
1628 | } |
1634 | return(0); |
1629 | return(0); |
1635 | } |
1630 | } |
1636 | 1631 | ||
1637 | /****************************************************************************************************************************************/ |
1632 | /****************************************************************************************************************************************/ |
1638 | /* Function: fclose_(File *file); */ |
1633 | /* Function: fclose_(File *file); */ |
1639 | /* */ |
1634 | /* */ |
1640 | /* Description: This function closes the open file by writing the remaining data */ |
1635 | /* Description: This function closes the open file by writing the remaining data */ |
1641 | /* from the buffer to the device and entering the filesize in the directory entry. */ |
1636 | /* from the buffer to the device and entering the filesize in the directory entry. */ |
1642 | /* */ |
1637 | /* */ |
1643 | /* Returnvalue: 0 on success EOF on error */ |
1638 | /* Returnvalue: 0 on success EOF on error */ |
1644 | /****************************************************************************************************************************************/ |
1639 | /****************************************************************************************************************************************/ |
1645 | s16 fclose_(File_t *file) |
1640 | s16 fclose_(File_t *file) |
1646 | { |
1641 | { |
1647 | s16 returnvalue = EOF; |
1642 | s16 returnvalue = EOF; |
1648 | 1643 | ||
1649 | if(file == NULL) return(returnvalue); |
1644 | if(file == NULL) return(returnvalue); |
1650 | returnvalue = fflush_(file); |
1645 | returnvalue = fflush_(file); |
1651 | UnlockFilePointer(file); |
1646 | UnlockFilePointer(file); |
1652 | return(returnvalue); |
1647 | return(returnvalue); |
1653 | } |
1648 | } |
1654 | 1649 | ||
1655 | /********************************************************************************************************************************************/ |
1650 | /********************************************************************************************************************************************/ |
1656 | /* Function: fgetc_(File *file); */ |
1651 | /* Function: fgetc_(File *file); */ |
1657 | /* */ |
1652 | /* */ |
1658 | /* Description: This function reads and returns one character from the specified file. Is the end of the actual sector reached the */ |
1653 | /* Description: This function reads and returns one character from the specified file. Is the end of the actual sector reached the */ |
1659 | /* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
1654 | /* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
1660 | /* */ |
1655 | /* */ |
1661 | /* Returnvalue: The function returns the character read from the specified memorylocation as u8 casted to s16 or EOF. */ |
1656 | /* Returnvalue: The function returns the character read from the specified memorylocation as u8 casted to s16 or EOF. */ |
1662 | /********************************************************************************************************************************************/ |
1657 | /********************************************************************************************************************************************/ |
1663 | s16 fgetc_(File_t *file) |
1658 | s16 fgetc_(File_t *file) |
1664 | { |
1659 | { |
1665 | s16 c = EOF; |
1660 | s16 c = EOF; |
1666 | u32 curr_sector; |
1661 | u32 curr_sector; |
1667 | 1662 | ||
1668 | if( (!Partition.IsValid) || (file == NULL)) return(c); |
1663 | if( (!Partition.IsValid) || (file == NULL)) return(c); |
1669 | // if the end of the file is not reached, get the next character. |
1664 | // if the end of the file is not reached, get the next character. |
1670 | if((0 < file->Size) && ((file->Position+1) < file->Size) ) |
1665 | if((0 < file->Size) && ((file->Position+1) < file->Size) ) |
1671 | { |
1666 | { |
1672 | curr_sector = file->FirstSectorOfCurrCluster; // calculate the sector of the next character to be read. |
1667 | curr_sector = file->FirstSectorOfCurrCluster; // calculate the sector of the next character to be read. |
1673 | curr_sector += file->SectorOfCurrCluster; |
1668 | curr_sector += file->SectorOfCurrCluster; |
1674 | 1669 | ||
1675 | if(file->SectorInCache != curr_sector) |
1670 | if(file->SectorInCache != curr_sector) |
1676 | { |
1671 | { |
1677 | file->SectorInCache = curr_sector; |
1672 | file->SectorInCache = curr_sector; |
1678 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache,file->Cache)) |
1673 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache,file->Cache)) |
1679 | { |
1674 | { |
1680 | Fat16_Deinit(); |
1675 | Fat16_Deinit(); |
1681 | return(c); |
1676 | return(c); |
1682 | } |
1677 | } |
1683 | } |
1678 | } |
1684 | c = (s16) file->Cache[file->ByteOfCurrSector]; |
1679 | c = (s16) file->Cache[file->ByteOfCurrSector]; |
1685 | file->Position++; // increment file position |
1680 | file->Position++; // increment file position |
1686 | file->ByteOfCurrSector++; // goto next byte in sector |
1681 | file->ByteOfCurrSector++; // goto next byte in sector |
1687 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if end of sector |
1682 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if end of sector |
1688 | { |
1683 | { |
1689 | file->ByteOfCurrSector = 0; // reset byte location |
1684 | file->ByteOfCurrSector = 0; // reset byte location |
1690 | file->SectorOfCurrCluster++; // next sector |
1685 | file->SectorOfCurrCluster++; // next sector |
1691 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster) // if end of cluster is reached, the next datacluster has to be searched in the FAT. |
1686 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster) // if end of cluster is reached, the next datacluster has to be searched in the FAT. |
1692 | { |
1687 | { |
1693 | 1688 | ||
1694 | if(GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
1689 | if(GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
1695 | { |
1690 | { |
1696 | file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
1691 | file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
1697 | } |
1692 | } |
1698 | else // the last cluster was allready reached |
1693 | else // the last cluster was allready reached |
1699 | { |
1694 | { |
1700 | file->SectorOfCurrCluster--; // jump back to the last sector in the last cluster |
1695 | file->SectorOfCurrCluster--; // jump back to the last sector in the last cluster |
1701 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set ByteOfCurrSector one byte over sector end |
1696 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set ByteOfCurrSector one byte over sector end |
1702 | } |
1697 | } |
1703 | } |
1698 | } |
1704 | } |
1699 | } |
1705 | } |
1700 | } |
1706 | return(c); |
1701 | return(c); |
1707 | } |
1702 | } |
1708 | 1703 | ||
1709 | /********************************************************************************************************************************************/ |
1704 | /********************************************************************************************************************************************/ |
1710 | /* Function: fputc_( const s8 c, File *file); */ |
1705 | /* Function: fputc_( const s8 c, File *file); */ |
1711 | /* */ |
1706 | /* */ |
1712 | /* Description: This function writes a byte to the specified file and takes care of writing the necessary FAT- Entries. */ |
1707 | /* Description: This function writes a byte to the specified file and takes care of writing the necessary FAT- Entries. */ |
1713 | /* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
1708 | /* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
1714 | /* */ |
1709 | /* */ |
1715 | /* Returnvalue: The function returns the character written to the stream or EOF on error. */ |
1710 | /* Returnvalue: The function returns the character written to the stream or EOF on error. */ |
1716 | /********************************************************************************************************************************************/ |
1711 | /********************************************************************************************************************************************/ |
1717 | s16 fputc_(const s8 c, File_t *file) |
1712 | s16 fputc_(const s8 c, File_t *file) |
1718 | { |
1713 | { |
1719 | u32 curr_sector = 0; |
1714 | u32 curr_sector = 0; |
1720 | 1715 | ||
1721 | if((!Partition.IsValid) || (file == NULL)) return(EOF); |
1716 | if((!Partition.IsValid) || (file == NULL)) return(EOF); |
1722 | switch(file->Mode) |
1717 | switch(file->Mode) |
1723 | { |
1718 | { |
1724 | case 'w': |
1719 | case 'w': |
1725 | case 'a': |
1720 | case 'a': |
1726 | // If file position equals to file size, then the end of file has been reached. |
1721 | // If file position equals to file size, then the end of file has been reached. |
1727 | // In this case it has to be checked that the ByteOfCurrSector is BYTES_PER_SECTOR |
1722 | // In this case it has to be checked that the ByteOfCurrSector is BYTES_PER_SECTOR |
1728 | // and a new cluster should be appended. |
1723 | // and a new cluster should be appended. |
1729 | // If the first sector of first cluster is unvalid, then the file claims no data clusters |
1724 | // If the first sector of first cluster is unvalid, then the file claims no data clusters |
1730 | // and size should be zero, therefore append a new Cluster too. |
1725 | // and size should be zero, therefore append a new Cluster too. |
1731 | if(((file->Position >= file->Size) && (file->ByteOfCurrSector >= BYTES_PER_SECTOR)) || (file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED)) |
1726 | if(((file->Position >= file->Size) && (file->ByteOfCurrSector >= BYTES_PER_SECTOR)) || (file->FirstSectorOfFirstCluster == SECTOR_UNDEFINED)) |
1732 | { |
1727 | { |
1733 | if(CLUSTER_UNDEFINED == AppendCluster(file)) return(EOF); |
1728 | if(CLUSTER_UNDEFINED == AppendCluster(file)) return(EOF); |
1734 | } |
1729 | } |
1735 | 1730 | ||
1736 | curr_sector = file->FirstSectorOfCurrCluster; |
1731 | curr_sector = file->FirstSectorOfCurrCluster; |
1737 | curr_sector += file->SectorOfCurrCluster; |
1732 | curr_sector += file->SectorOfCurrCluster; |
1738 | if(file->SectorInCache != curr_sector) |
1733 | if(file->SectorInCache != curr_sector) |
1739 | { |
1734 | { |
1740 | file->SectorInCache = curr_sector; |
1735 | file->SectorInCache = curr_sector; |
1741 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) |
1736 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) |
1742 | { |
1737 | { |
1743 | Fat16_Deinit(); |
1738 | Fat16_Deinit(); |
1744 | return(EOF); |
1739 | return(EOF); |
1745 | } |
1740 | } |
1746 | } |
1741 | } |
1747 | 1742 | ||
1748 | file->Cache[file->ByteOfCurrSector] = (u8)c; // write databyte into the buffer. The byte will be written to the device at once |
1743 | file->Cache[file->ByteOfCurrSector] = (u8)c; // write databyte into the buffer. The byte will be written to the device at once |
1749 | if(file->Size == file->Position) file->Size++; // a character has been written to the file so the size is incremented only when the character has been added at the end of the file. |
1744 | if(file->Size == file->Position) file->Size++; // a character has been written to the file so the size is incremented only when the character has been added at the end of the file. |
1750 | file->Position++; // the actual positon within the file. |
1745 | file->Position++; // the actual positon within the file. |
1751 | file->ByteOfCurrSector++; // goto next byte in sector |
1746 | file->ByteOfCurrSector++; // goto next byte in sector |
1752 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if the end of this sector is reached yet |
1747 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if the end of this sector is reached yet |
1753 | { // save the sector to the sd-card |
1748 | { // save the sector to the sd-card |
1754 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
1749 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
1755 | { |
1750 | { |
1756 | Fat16_Deinit(); |
1751 | Fat16_Deinit(); |
1757 | return(EOF); |
1752 | return(EOF); |
1758 | } |
1753 | } |
1759 | file->ByteOfCurrSector = 0; // reset byte location |
1754 | file->ByteOfCurrSector = 0; // reset byte location |
1760 | file->SectorOfCurrCluster++; // next sector |
1755 | file->SectorOfCurrCluster++; // next sector |
1761 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster)// if end of cluster is reached, the next datacluster has to be searched in the FAT. |
1756 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster)// if end of cluster is reached, the next datacluster has to be searched in the FAT. |
1762 | { |
1757 | { |
1763 | if(!GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
1758 | if(!GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
1764 | { // if current cluster was the last cluster of the file |
1759 | { // if current cluster was the last cluster of the file |
1765 | if(!AppendCluster(file)) // append a new and free cluster at the end of the file. |
1760 | if(!AppendCluster(file)) // append a new and free cluster at the end of the file. |
1766 | { |
1761 | { |
1767 | file->SectorOfCurrCluster--; // jump back to last sector of last cluster |
1762 | file->SectorOfCurrCluster--; // jump back to last sector of last cluster |
1768 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set byte location to 1 byte over sector len |
1763 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set byte location to 1 byte over sector len |
1769 | return(EOF); |
1764 | return(EOF); |
1770 | } |
1765 | } |
1771 | } |
1766 | } |
1772 | else // next cluster |
1767 | else // next cluster |
1773 | { |
1768 | { |
1774 | file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
1769 | file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
1775 | } |
1770 | } |
1776 | } |
1771 | } |
1777 | } |
1772 | } |
1778 | break; |
1773 | break; |
1779 | case 'r': |
1774 | case 'r': |
1780 | default: |
1775 | default: |
1781 | return(EOF); |
1776 | return(EOF); |
1782 | break; |
1777 | break; |
1783 | } // EOF switch(file->Mode) |
1778 | } // EOF switch(file->Mode) |
1784 | return(0); |
1779 | return(0); |
1785 | } |
1780 | } |
1786 | 1781 | ||
1787 | 1782 | ||
1788 | /****************************************************************************************************************************************/ |
1783 | /****************************************************************************************************************************************/ |
1789 | /* Function: fread_(void *buffer, s32 size, s32 count, File *File); */ |
1784 | /* Function: fread_(void *buffer, s32 size, s32 count, File *File); */ |
1790 | /* */ |
1785 | /* */ |
1791 | /* Description: This function reads count objects of the specified size */ |
1786 | /* Description: This function reads count objects of the specified size */ |
1792 | /* from the actual position of the file to the specified buffer. */ |
1787 | /* from the actual position of the file to the specified buffer. */ |
1793 | /* */ |
1788 | /* */ |
1794 | /* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
1789 | /* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
1795 | /****************************************************************************************************************************************/ |
1790 | /****************************************************************************************************************************************/ |
1796 | u32 fread_(void *buffer, u32 size, u32 count, File_t *file) |
1791 | u32 fread_(void *buffer, u32 size, u32 count, File_t *file) |
1797 | { |
1792 | { |
1798 | u32 object_cnt = 0; // count the number of objects read from the file. |
1793 | u32 object_cnt = 0; // count the number of objects read from the file. |
1799 | u32 object_size = 0; // count the number of bytes read from the actual object. |
1794 | u32 object_size = 0; // count the number of bytes read from the actual object. |
1800 | u8 *pbuff = 0; // a pointer to the actual bufferposition. |
1795 | u8 *pbuff = 0; // a pointer to the actual bufferposition. |
1801 | u8 success = 1; // no error occured during read operation to the file. |
1796 | u8 success = 1; // no error occured during read operation to the file. |
1802 | s16 c; |
1797 | s16 c; |
1803 | 1798 | ||
1804 | if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
1799 | if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
1805 | 1800 | ||
1806 | pbuff = (u8 *) buffer; // cast the void pointer to an u8 * |
1801 | pbuff = (u8 *) buffer; // cast the void pointer to an u8 * |
1807 | 1802 | ||
1808 | while((object_cnt < count) && success) |
1803 | while((object_cnt < count) && success) |
1809 | { |
1804 | { |
1810 | object_size = size; |
1805 | object_size = size; |
1811 | while((size > 0) && success) |
1806 | while((size > 0) && success) |
1812 | { |
1807 | { |
1813 | c = fgetc_(file); |
1808 | c = fgetc_(file); |
1814 | if(c != EOF) |
1809 | if(c != EOF) |
1815 | { |
1810 | { |
1816 | *pbuff = (u8)c; // read a byte from the buffer to the opened file. |
1811 | *pbuff = (u8)c; // read a byte from the buffer to the opened file. |
1817 | pbuff++; |
1812 | pbuff++; |
1818 | size--; |
1813 | size--; |
1819 | } |
1814 | } |
1820 | else // error or end of file reached |
1815 | else // error or end of file reached |
1821 | { |
1816 | { |
1822 | success = 0; |
1817 | success = 0; |
1823 | } |
1818 | } |
1824 | } |
1819 | } |
1825 | if(success) object_cnt++; |
1820 | if(success) object_cnt++; |
1826 | } |
1821 | } |
1827 | return(object_cnt); // return the number of objects succesfully read from the file |
1822 | return(object_cnt); // return the number of objects succesfully read from the file |
1828 | } |
1823 | } |
1829 | 1824 | ||
1830 | 1825 | ||
1831 | /****************************************************************************************************************************************/ |
1826 | /****************************************************************************************************************************************/ |
1832 | /* Function: fwrite_(void *buffer, s32 size, s32 count, File *file); */ |
1827 | /* Function: fwrite_(void *buffer, s32 size, s32 count, File *file); */ |
1833 | /* */ |
1828 | /* */ |
1834 | /* Description: This function writes count objects of the specified size */ |
1829 | /* Description: This function writes count objects of the specified size */ |
1835 | /* from the buffer pointer to the actual position in the file. */ |
1830 | /* from the buffer pointer to the actual position in the file. */ |
1836 | /* */ |
1831 | /* */ |
1837 | /* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
1832 | /* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
1838 | /****************************************************************************************************************************************/ |
1833 | /****************************************************************************************************************************************/ |
1839 | u32 fwrite_(void *buffer, u32 size, u32 count, File_t *file) |
1834 | u32 fwrite_(void *buffer, u32 size, u32 count, File_t *file) |
1840 | { |
1835 | { |
1841 | u32 object_cnt = 0; // count the number of objects written to the file. |
1836 | u32 object_cnt = 0; // count the number of objects written to the file. |
1842 | u32 object_size = 0; // count the number of bytes written from the actual object. |
1837 | u32 object_size = 0; // count the number of bytes written from the actual object. |
1843 | u8 *pbuff = 0; // a pointer to the actual bufferposition. |
1838 | u8 *pbuff = 0; // a pointer to the actual bufferposition. |
1844 | u8 success = 1; // no error occured during write operation to the file. |
1839 | u8 success = 1; // no error occured during write operation to the file. |
1845 | s16 c; |
1840 | s16 c; |
1846 | 1841 | ||
1847 | if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
1842 | if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
1848 | if(file->Mode == 'r') return (0); // opened read only |
1843 | if(file->Mode == 'r') return (0); // opened read only |
1849 | pbuff = (u8 *) buffer; // cast the void pointer to an u8 * |
1844 | pbuff = (u8 *) buffer; // cast the void pointer to an u8 * |
1850 | 1845 | ||
1851 | while((object_cnt < count) && success) |
1846 | while((object_cnt < count) && success) |
1852 | { |
1847 | { |
1853 | object_size = size; |
1848 | object_size = size; |
1854 | while((size > 0) && success) |
1849 | while((size > 0) && success) |
1855 | { |
1850 | { |
1856 | c = fputc_(*pbuff, file); // write a byte from the buffer to the opened file. |
1851 | c = fputc_(*pbuff, file); // write a byte from the buffer to the opened file. |
1857 | if(c != EOF) |
1852 | if(c != EOF) |
1858 | { |
1853 | { |
1859 | pbuff++; |
1854 | pbuff++; |
1860 | size--; |
1855 | size--; |
1861 | } |
1856 | } |
1862 | else |
1857 | else |
1863 | { |
1858 | { |
1864 | success = 0; |
1859 | success = 0; |
1865 | } |
1860 | } |
1866 | } |
1861 | } |
1867 | if(success) object_cnt++; |
1862 | if(success) object_cnt++; |
1868 | } |
1863 | } |
1869 | 1864 | ||
1870 | return(object_cnt); // return the number of objects succesfully written to the file |
1865 | return(object_cnt); // return the number of objects succesfully written to the file |
1871 | } |
1866 | } |
1872 | 1867 | ||
1873 | 1868 | ||
1874 | /****************************************************************************************************************************************/ |
1869 | /****************************************************************************************************************************************/ |
1875 | /* Function: fputs_(const s8 *string, File_t *File); */ |
1870 | /* Function: fputs_(const s8 *string, File_t *File); */ |
1876 | /* */ |
1871 | /* */ |
1877 | /* Description: This function writes a string to the specified file. */ |
1872 | /* Description: This function writes a string to the specified file. */ |
1878 | /* */ |
1873 | /* */ |
1879 | /* Returnvalue: The function returns a no negative value or EOF on error. */ |
1874 | /* Returnvalue: The function returns a no negative value or EOF on error. */ |
1880 | /****************************************************************************************************************************************/ |
1875 | /****************************************************************************************************************************************/ |
1881 | s16 fputs_(s8 * const string, File_t * const file) |
1876 | s16 fputs_(s8 * const string, File_t * const file) |
1882 | { |
1877 | { |
1883 | u8 i=0; |
1878 | u8 i=0; |
1884 | s16 c = 0; |
1879 | s16 c = 0; |
1885 | 1880 | ||
1886 | if((!Partition.IsValid) || (file == NULL) || (string == NULL)) return(EOF); |
1881 | if((!Partition.IsValid) || (file == NULL) || (string == NULL)) return(EOF); |
1887 | if(file->Mode == 'r') return(EOF); |
1882 | if(file->Mode == 'r') return(EOF); |
1888 | while((string[i] != 0)&& (c != EOF)) |
1883 | while((string[i] != 0)&& (c != EOF)) |
1889 | { |
1884 | { |
1890 | c = fputc_(string[i], file); |
1885 | c = fputc_(string[i], file); |
1891 | i++; |
1886 | i++; |
1892 | } |
1887 | } |
1893 | return(c); |
1888 | return(c); |
1894 | } |
1889 | } |
1895 | 1890 | ||
1896 | /****************************************************************************************************************************************/ |
1891 | /****************************************************************************************************************************************/ |
1897 | /* Function: fgets_(s8 *, s16 , File_t *); */ |
1892 | /* Function: fgets_(s8 *, s16 , File_t *); */ |
1898 | /* */ |
1893 | /* */ |
1899 | /* Description: This function reads a string from the file to the specifies string. */ |
1894 | /* Description: This function reads a string from the file to the specifies string. */ |
1900 | /* */ |
1895 | /* */ |
1901 | /* Returnvalue: A pointer to the string read from the file or 0 on error. */ |
1896 | /* Returnvalue: A pointer to the string read from the file or 0 on error. */ |
1902 | /****************************************************************************************************************************************/ |
1897 | /****************************************************************************************************************************************/ |
1903 | s8 * fgets_(s8 * const string, s16 const length, File_t * const file) |
1898 | s8 * fgets_(s8 * const string, s16 const length, File_t * const file) |
1904 | { |
1899 | { |
1905 | s8 *pbuff; |
1900 | s8 *pbuff; |
1906 | s16 c = 0, bytecount; |
1901 | s16 c = 0, bytecount; |
1907 | 1902 | ||
1908 | if((!Partition.IsValid) || (file == NULL) || (string == NULL) || (length < 1)) return (0); |
1903 | if((!Partition.IsValid) || (file == NULL) || (string == NULL) || (length < 1)) return (0); |
1909 | bytecount = length; |
1904 | bytecount = length; |
1910 | pbuff = string; // set write pointer to start of string |
1905 | pbuff = string; // set write pointer to start of string |
1911 | while(bytecount > 1) // read the length-1 characters from the file to the string. |
1906 | while(bytecount > 1) // read the length-1 characters from the file to the string. |
1912 | { |
1907 | { |
1913 | c = fgetc_(file); // read a character from the opened file. |
1908 | c = fgetc_(file); // read a character from the opened file. |
1914 | switch(c) |
1909 | switch(c) |
1915 | { |
1910 | { |
1916 | case 0x0A: // new line |
1911 | case 0x0A: // new line |
1917 | *pbuff = 0; // set string terminator |
1912 | *pbuff = 0; // set string terminator |
1918 | return(string); // return normal |
1913 | return(string); // return normal |
1919 | 1914 | ||
1920 | case EOF: |
1915 | case EOF: |
1921 | *pbuff = 0; // set string terminator |
1916 | *pbuff = 0; // set string terminator |
1922 | return(0); |
1917 | return(0); |
1923 | 1918 | ||
1924 | default: |
1919 | default: |
1925 | *pbuff++ = (s8)c; // copy byte to string |
1920 | *pbuff++ = (s8)c; // copy byte to string |
1926 | bytecount--; |
1921 | bytecount--; |
1927 | break; |
1922 | break; |
1928 | } |
1923 | } |
1929 | } |
1924 | } |
1930 | *pbuff = 0; // set string terminator |
1925 | *pbuff = 0; // set string terminator |
1931 | return(string); |
1926 | return(string); |
1932 | } |
1927 | } |
1933 | 1928 | ||
1934 | /****************************************************************************************************************************************/ |
1929 | /****************************************************************************************************************************************/ |
1935 | /* Function: fexist_(const u8*); */ |
1930 | /* Function: fexist_(const u8*); */ |
1936 | /* */ |
1931 | /* */ |
1937 | /* Description: This function checks if a file already exist. */ |
1932 | /* Description: This function checks if a file already exist. */ |
1938 | /* */ |
1933 | /* */ |
1939 | /* Returnvalue: 1 if the file exist else 0. */ |
1934 | /* Returnvalue: 1 if the file exist else 0. */ |
1940 | /****************************************************************************************************************************************/ |
1935 | /****************************************************************************************************************************************/ |
1941 | u8 fexist_(s8 * const filename) |
1936 | u8 fexist_(s8 * const filename) |
1942 | { |
1937 | { |
1943 | u8 exist = 0; |
1938 | u8 exist = 0; |
1944 | File_t *file = 0; |
1939 | File_t *file = 0; |
1945 | file = LockFilePointer(); |
1940 | file = LockFilePointer(); |
1946 | exist = FileExist(filename, ATTR_NONE, ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL, file); |
1941 | exist = FileExist(filename, ATTR_NONE, ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL, file); |
1947 | UnlockFilePointer(file); |
1942 | UnlockFilePointer(file); |
1948 | return(exist); |
1943 | return(exist); |
1949 | } |
1944 | } |
1950 | 1945 | ||
1951 | /****************************************************************************************************************************************/ |
1946 | /****************************************************************************************************************************************/ |
1952 | /* Function: feof_(File_t *File); */ |
1947 | /* Function: feof_(File_t *File); */ |
1953 | /* */ |
1948 | /* */ |
1954 | /* Description: This function checks wether the end of the file has been reached. */ |
1949 | /* Description: This function checks wether the end of the file has been reached. */ |
1955 | /* */ |
1950 | /* */ |
1956 | /* Returnvalue: 0 if the end of the file was not reached otherwise 1. */ |
1951 | /* Returnvalue: 0 if the end of the file was not reached otherwise 1. */ |
1957 | /****************************************************************************************************************************************/ |
1952 | /****************************************************************************************************************************************/ |
1958 | u8 feof_(File_t *file) |
1953 | u8 feof_(File_t *file) |
1959 | { |
1954 | { |
1960 | if(((file->Position)+1) < (file->Size)) |
1955 | if(((file->Position)+1) < (file->Size)) |
1961 | { |
1956 | { |
1962 | return(0); |
1957 | return(0); |
1963 | } |
1958 | } |
1964 | else |
1959 | else |
1965 | { |
1960 | { |
1966 | return(1); |
1961 | return(1); |
1967 | } |
1962 | } |
1968 | } |
1963 | } |
1969 | 1964 | ||
1970 | /****************************************************************************************************************************************************/ |
1965 | /****************************************************************************************************************************************************/ |
1971 | /* Function: s8* FAT16_GetVolumeLabel(void) */ |
1966 | /* Function: s8* FAT16_GetVolumeLabel(void) */ |
1972 | /* */ |
1967 | /* */ |
1973 | /* Description: This function returns the volume label */ |
1968 | /* Description: This function returns the volume label */ |
1974 | /* */ |
1969 | /* */ |
1975 | /* Returnvalue: This function returns the pointer to the volume label or NULL if not found. */ |
1970 | /* Returnvalue: This function returns the pointer to the volume label or NULL if not found. */ |
1976 | /****************************************************************************************************************************************************/ |
1971 | /****************************************************************************************************************************************************/ |
1977 | s8* FAT16_GetVolumeLabel(void) |
1972 | s8* FAT16_GetVolumeLabel(void) |
1978 | { |
1973 | { |
1979 | s8 *pVolumeLabel = NULL; |
1974 | s8 *pVolumeLabel = NULL; |
1980 | u32 dir_sector, max_dir_sector, curr_sector; |
1975 | u32 dir_sector, max_dir_sector, curr_sector; |
1981 | u16 dir_entry = 0; |
1976 | u16 dir_entry = 0; |
1982 | u8 i = 0; |
1977 | u8 i = 0; |
1983 | 1978 | ||
1984 | DirEntry_t * dir; |
1979 | DirEntry_t * dir; |
1985 | File_t *file = NULL; |
1980 | File_t *file = NULL; |
1986 | 1981 | ||
1987 | // if Partition is not valud return NULL |
1982 | // if Partition is not valud return NULL |
1988 | if(!Partition.IsValid) return(pVolumeLabel); |
1983 | if(!Partition.IsValid) return(pVolumeLabel); |
1989 | // if Volume label was read before return it |
1984 | // if Volume label was read before return it |
1990 | if(Partition.VolumeLabel[0]!= '\0') return (Partition.VolumeLabel); |
1985 | if(Partition.VolumeLabel[0]!= '\0') return (Partition.VolumeLabel); |
1991 | // try to catch a file pointer |
1986 | // try to catch a file pointer |
1992 | file = LockFilePointer(); |
1987 | file = LockFilePointer(); |
1993 | if(file == NULL) return(pVolumeLabel); |
1988 | if(file == NULL) return(pVolumeLabel); |
1994 | // search dir entries direct within the root directory area |
1989 | // search dir entries direct within the root directory area |
1995 | file->DirectorySector = 0; |
1990 | file->DirectorySector = 0; |
1996 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1991 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
1997 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
1992 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
1998 | 1993 | ||
1999 | // update current file data area position to start of first cluster |
1994 | // update current file data area position to start of first cluster |
2000 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
1995 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
2001 | file->SectorOfCurrCluster = 0; |
1996 | file->SectorOfCurrCluster = 0; |
2002 | file->ByteOfCurrSector = 0; |
1997 | file->ByteOfCurrSector = 0; |
2003 | 1998 | ||
2004 | dir_sector = 0; // reset sector counter within a new cluster |
1999 | dir_sector = 0; // reset sector counter within a new cluster |
2005 | do // loop over all sectors of the root directory |
2000 | do // loop over all sectors of the root directory |
2006 | { |
2001 | { |
2007 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
2002 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
2008 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
2003 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
2009 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read the sector |
2004 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read the sector |
2010 | { |
2005 | { |
2011 | Fat16_Deinit(); |
2006 | Fat16_Deinit(); |
2012 | return(pVolumeLabel); |
2007 | return(pVolumeLabel); |
2013 | } |
2008 | } |
2014 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
2009 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
2015 | // search all directory entries within that sector |
2010 | // search all directory entries within that sector |
2016 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
2011 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
2017 | { // check for existing dir entry |
2012 | { // check for existing dir entry |
2018 | switch((u8)dir[dir_entry].Name[0]) |
2013 | switch((u8)dir[dir_entry].Name[0]) |
2019 | { |
2014 | { |
2020 | case SLOT_EMPTY: |
2015 | case SLOT_EMPTY: |
2021 | case SLOT_DELETED: |
2016 | case SLOT_DELETED: |
2022 | // ignore empty or deleted dir entries |
2017 | // ignore empty or deleted dir entries |
2023 | break; |
2018 | break; |
2024 | default: |
2019 | default: |
2025 | // check attributes for volume label |
2020 | // check attributes for volume label |
2026 | if ((dir[dir_entry].Attribute & ATTR_VOLUMELABEL) != ATTR_VOLUMELABEL) break; // attribute must match |
2021 | if ((dir[dir_entry].Attribute & ATTR_VOLUMELABEL) != ATTR_VOLUMELABEL) break; // attribute must match |
2027 | // (first 11 characters include 8 chars of basename and 3 chars extension.) |
2022 | // (first 11 characters include 8 chars of basename and 3 chars extension.) |
2028 | for(i = 0; i<11;i++) Partition.VolumeLabel[i] = dir[dir_entry].Name[i]; |
2023 | for(i = 0; i<11;i++) Partition.VolumeLabel[i] = dir[dir_entry].Name[i]; |
2029 | Partition.VolumeLabel[11] = '\0'; // terminate string |
2024 | Partition.VolumeLabel[11] = '\0'; // terminate string |
2030 | file->Attribute = dir[dir_entry].Attribute; // store attribute of found dir entry |
2025 | file->Attribute = dir[dir_entry].Attribute; // store attribute of found dir entry |
2031 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[dir_entry].StartCluster); // set sector of first data cluster |
2026 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[dir_entry].StartCluster); // set sector of first data cluster |
2032 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
2027 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
2033 | file->SectorOfCurrCluster = 0; |
2028 | file->SectorOfCurrCluster = 0; |
2034 | file->ByteOfCurrSector = 0; |
2029 | file->ByteOfCurrSector = 0; |
2035 | file->DirectorySector = curr_sector; // current sector |
2030 | file->DirectorySector = curr_sector; // current sector |
2036 | file->DirectoryIndex = dir_entry; // current direntry in current sector |
2031 | file->DirectoryIndex = dir_entry; // current direntry in current sector |
2037 | file->Size = dir[dir_entry].Size; |
2032 | file->Size = dir[dir_entry].Size; |
2038 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
2033 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
2039 | pVolumeLabel = Partition.VolumeLabel; |
2034 | pVolumeLabel = Partition.VolumeLabel; |
2040 | } // end of first byte of name check |
2035 | } // end of first byte of name check |
2041 | } |
2036 | } |
2042 | dir_sector++; // search next sector |
2037 | dir_sector++; // search next sector |
2043 | // stop if we reached the end of the cluster or the end of the root dir |
2038 | // stop if we reached the end of the cluster or the end of the root dir |
2044 | }while((dir_sector < max_dir_sector) && (!pVolumeLabel)); |
2039 | }while((dir_sector < max_dir_sector) && (!pVolumeLabel)); |
2045 | 2040 | ||
2046 | UnlockFilePointer(file); |
2041 | UnlockFilePointer(file); |
2047 | return(pVolumeLabel); |
2042 | return(pVolumeLabel); |
2048 | } |
2043 | } |
2049 | 2044 |