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