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