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| Rev 231 | Rev 297 | ||
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| 1 | #include <stdio.h> |
1 | #include <string.h> |
| - | 2 | #include "printf_P.h" |
|
| 2 | #include <avr/io.h> |
3 | #include "timer0.h" |
| 3 | #include "fat16.h" |
4 | #include "fat16.h" |
| 4 | #include "sdc.h" |
5 | #include "sdc.h" |
| 5 | #include "printf_P.h" |
6 | #include "uart1.h" |
| Line 86... | Line 253... | ||
| 86 | 253 | File_t * File = 0; |
|
| - | 254 | for(i = 0; i < FILE_MAX_OPEN; i++) |
|
| - | 255 | { |
|
| - | 256 | if(FilePointer[i].State == FSTATE_UNUSED) // found an unused one |
|
| 87 | for(cnt=0;cnt<__MAX_FILES_USED;cnt++) |
257 | { |
| - | 258 | File = &FilePointer[i]; // set pointer to that entry |
|
| - | 259 | FilePointer[i].State = FSTATE_USED; // mark it as used |
|
| 88 | { |
260 | break; |
| - | 261 | } |
|
| - | 262 | } |
|
| Line 89... | Line -... | ||
| 89 | FilePointer[cnt].state = _UNUSED; // declare the filepointers as unused. |
- | |
| 90 | } |
- | |
| - | 263 | return(File); |
|
| 91 | 264 | } |
|
| 92 | file = &FilePointer[0]; |
265 | |
| 93 | - | ||
| 94 | while((SDC_Init() != 0) && (cnt++<200)); // initialise the sdcard. |
266 | /****************************************************************************************************************************************/ |
| 95 | if(cnt <200) //sdcard initialised succesfully |
267 | /* Function: UnlockFilePointer(file_t *); */ |
| 96 | { |
268 | /* */ |
| - | 269 | /* Description: This function trys to unlock a file pointer. */ |
|
| 97 | SDC_GetSector((u32)_MBR_SECTOR,file->buffer); // Read the MasterBootRecord from mmc. |
270 | /* */ |
| - | 271 | /* Returnvalue: Returns 1 if file pointer was freed else 0. */ |
|
| - | 272 | /****************************************************************************************************************************************/ |
|
| 98 | MBR = (struct MBR_Entry *) file->buffer; |
273 | uint8_t UnlockFilePointer(File_t * file) |
| 99 | FirstPartitionSector = MBR->PartitionEntry1.NoSectorsBeforePartition; |
274 | { |
| 100 | if((MBR->PartitionEntry1.Type == _FAT16_32_MB_BIOS_Extension) || |
275 | uint8_t cnt; |
| 101 | (MBR->PartitionEntry1.Type == _FAT16_ST_32_MB) || |
276 | if(file == NULL) return(0); |
| 102 | (MBR->PartitionEntry1.Type == _FAT16_LT_32_MB)) |
277 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
| - | 278 | { |
|
| 103 | { |
279 | if(&FilePointer[cnt] == file) // filepointer to be freed found? |
| - | 280 | { |
|
| 104 | SDC_GetSector(FirstPartitionSector,file->buffer); // Read the volume bootrecord from mmc. |
281 | file->State = FSTATE_UNUSED; |
| 105 | 282 | file->FirstSectorOfFirstCluster = 0; // Sectorpointer to the first sector of the first datacluster of the file. |
|
| 106 | VBR = (struct VBR_Entry *) file->buffer; // Enter the VBR using the structure VBR_Entry. |
283 | file->FirstSectorOfCurrCluster = 0; |
| 107 | SectorsPerCluster = VBR->SectorsPerCluster; // Number of sectors per cluster. Depends on the memorysize of the sd-card. |
284 | file->SectorOfCurrCluster = 0; // Pointer to the cluster which is edited at the moment. |
| 108 | FatCopies = VBR->NoFATCopies; // Number of fatcopies. |
285 | file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
| 109 | PossibleRootEntries = VBR->MaxRootEntries; // How many Entries are possible in the rootdirectory (FAT16 allows max. 512 entries). |
- | |
| 110 | SectorsPerFat = VBR->SectorsPerFAT; // The number of sectors per FAT. |
286 | file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
| 111 | ReservedSectors = VBR->ReservedSectors; // calculate the sectorpositon of the FAT, the Rootdirectory and the first Datacluster. |
287 | file->Mode = 0; // mode of fileoperation (read,write) |
| 112 | 288 | file->Size = 0; // the size of the opend file in bytes. |
|
| 113 | FileAllocationTable = (u32)(FirstPartitionSector + (u32)ReservedSectors); // Calculate the position of the FileAllocationTable. |
289 | file->Position = 0; // pointer to a character within the file 0 < fileposition < filesize |
| - | 290 | file->SectorInCache = 0; // the last sector read, wich is still in the sectorbuffer. |
|
| - | 291 | file->DirectorySector = 0; // the sectorposition where the directoryentry has been made. |
|
| 114 | RootDirectory = (u32)((u32)FileAllocationTable + (u32)((u32)SectorsPerFat*(u32)FatCopies)); // Calculate the position of the Rootdirectory. |
292 | file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
| 115 | FirstDataCluster = (u32)((u32)RootDirectory + ((u32)(PossibleRootEntries>>4))); // Calculate the position of the first datacluster. |
293 | file->Attribute = 0; // the attribute of the file opened. |
| 116 | CWD = RootDirectory; // The actual directory is the rootdirectory. |
294 | file = NULL; |
| 117 | retvalue = 1; |
295 | return(1); |
| 118 | } |
296 | } |
| Line 119... | Line 297... | ||
| 119 | } |
297 | } |
| - | 298 | return(0); |
|
| 120 | return(retvalue); |
299 | } |
| 121 | } |
- | |
| 122 | 300 | ||
| - | 301 | /****************************************************************************************************************************************/ |
|
| 123 | //________________________________________________________________________________________________________________________________________ |
302 | /* Function: SeperateDirName(int8_t*, int8_t*); */ |
| - | 303 | /* */ |
|
| - | 304 | /* Description: This function seperates the first dirname from filepath and brings them */ |
|
| - | 305 | /* into the needed format ('test.txt' -> 'TEST TXT') */ |
|
| - | 306 | /* The subpath is the pointer to the remaining substring if the filepath */ |
|
| 124 | // Funtion: File * fopen_(u8*, u8 *); |
307 | /* */ |
| - | 308 | /* Returnvalue: Return NULL on error or pointer to subpath */ |
|
| 125 | // |
309 | /****************************************************************************************************************************************/ |
| 126 | // Description: This function looks for the file in the directory specified by the variable "CWD" of the drive. If the file is found the number of the |
310 | int8_t* SeperateDirName(const int8_t *filepath, int8_t *dirname) |
| 127 | // corrosponding datacluster is returned to main. Only modes 'r' (reading) and 'a' append are implemented yet. |
- | |
| 128 | // |
311 | { |
| 129 | // Return: 0 = faild to open speicified file |
312 | int8_t* subpath = NULL; |
| - | 313 | uint8_t readpointer = 0; |
|
| - | 314 | uint8_t writepointer = 0; |
|
| - | 315 | ||
| - | 316 | // search subpath from beginning of filepath |
|
| 130 | // 1 = file opened |
317 | subpath = NULL; |
| - | 318 | readpointer = 0; |
|
| - | 319 | if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
|
| - | 320 | while(subpath == NULL) // search the filepath until a subpath was found. |
|
| - | 321 | { |
|
| 131 | //________________________________________________________________________________________________________________________________________ |
322 | if(((filepath[readpointer] == 0) || (filepath[readpointer] == '/'))) // if '/' found or end of filepath reached |
| 132 | 323 | { |
|
| 133 | File * fopen_(s8 *fname, s8 mode) |
- | |
| 134 | { |
324 | subpath = (int8_t*)&filepath[readpointer]; // store the position of the first "/" found after the beginning of the filenpath |
| - | 325 | } |
|
| - | 326 | readpointer++; |
|
| - | 327 | } |
|
| - | 328 | ||
| - | 329 | // clear dirname with spaces |
|
| - | 330 | dirname[11] = 0; // terminate dirname |
|
| 135 | File *file; |
331 | for(writepointer = 0; writepointer < 11; writepointer++) dirname[writepointer] = ' '; |
| - | 332 | writepointer = 0; |
|
| 136 | 333 | // start seperating the dirname from the filepath. |
|
| 137 | file = ReserveFilePointer(); // reserve a filepointer. |
334 | readpointer = 0; |
| 138 | - | ||
| 139 | if(file != NULL) // A free filepointer was found. |
335 | if(filepath[0] == '/') readpointer = 1; // ignore first '/' |
| 140 | { |
336 | while( &filepath[readpointer] < subpath) |
| 141 | file->mode = mode; // mode of fileoperation (read,write) |
337 | { |
| 142 | 338 | if(writepointer >= 11) return(NULL); // dirname to long |
|
| 143 | if(SeekFileInDirectory(fname, file)) // if file was found |
339 | if(filepath[readpointer] == '.') // seperating dirname and extension. |
| 144 | { |
- | |
| 145 | if(mode == 'a') // open existing file for writing (append data at the end of the file) |
340 | { |
| 146 | { |
- | |
| 147 | fseek_(file, 0, SEEK_END); // fseek points to the end of the file |
- | |
| 148 | } |
- | |
| 149 | else if(mode == 'r') |
- | |
| 150 | { |
- | |
| 151 | return(file); |
- | |
| 152 | } |
- | |
| 153 | else |
341 | if(writepointer <= 8) |
| 154 | { |
- | |
| - | 342 | { |
|
| 155 | fclose_(file); |
343 | readpointer++; // next character in filename |
| 156 | file = NULL; |
344 | writepointer = 8; // jump to start of extension |
| 157 | } |
345 | } |
| 158 | 346 | else return(NULL); // dirbasename to long |
|
| 159 | } |
347 | } |
| 160 | else |
348 | else |
| 161 | { |
- | |
| 162 | if((mode == 'a') || (mode == 'w')) // specified file doesn't exist so create new file for writing data. |
- | |
| 163 | { |
349 | { |
| 164 | if(CreateFileInDirectory(fname,file)) // Could an entry for the new file in the rootdirectory be created? |
350 | if((0x60 < filepath[readpointer]) && (filepath[readpointer] < 0x7B)) |
| 165 | { |
351 | { |
| 166 | return(file); |
352 | dirname[writepointer] = (filepath[readpointer] - 0x20); // all characters must be upper case. |
| 167 | } |
- | |
| 168 | else |
- | |
| 169 | { |
353 | } |
| - | 354 | else |
|
| - | 355 | { |
|
| 170 | fclose_(file); |
356 | dirname[writepointer] = filepath[readpointer]; |
| 171 | file = NULL; |
357 | } |
| 172 | } |
358 | readpointer++; |
| 173 | } |
359 | writepointer++; |
| Line 174... | Line -... | ||
| 174 | } |
- | |
| 175 | } |
360 | } |
| - | 361 | } |
|
| 176 | return(file); |
362 | return(subpath); |
| 177 | } |
- | |
| 178 | 363 | } |
|
| 179 | - | ||
| - | 364 | ||
| - | 365 | ||
| - | 366 | /**************************************************************************************************************************************+*/ |
|
| 180 | 367 | /* Function: Fat16ClusterToSector( uint16_t cluster); */ |
|
| 181 | //________________________________________________________________________________________________________________________________________ |
- | |
| 182 | // Funtion: fflush_(File *file); |
368 | /* */ |
| 183 | // |
369 | /* Description: This function converts a cluster number given by the fat to the corresponding */ |
| 184 | // Description: This function writes the data already in the buffer but not yet written to the file. |
- | |
| 185 | // |
- | |
| 186 | //________________________________________________________________________________________________________________________________________ |
- | |
| 187 | - | ||
| 188 | s16 fflush_(File *file) |
370 | /* sector that points to the start of the data area that is represented by the cluster number. */ |
| 189 | { |
- | |
| 190 | u16 time=0; |
371 | /* */ |
| 191 | u16 date=0; |
- | |
| 192 | 372 | /* Returnvalue: The sector number with the data area of the given cluster */ |
|
| 193 | - | ||
| 194 | if(file && ((file->mode =='a') || (file->mode =='w'))) |
- | |
| 195 | { |
- | |
| 196 | if(file->byte_index > 0) // has data been added to the file? |
- | |
| 197 | { |
- | |
| 198 | SDC_PutSector((u32)(file->cluster_pointer + file->sector_index),file->buffer);// save the data still in the buffer |
- | |
| 199 | } |
- | |
| 200 | SDC_GetSector((u32)file->directory_sector,file->buffer); // read the directoryentry for this file. |
- | |
| 201 | DirectoryEntry = (struct DirEntry *)file->buffer; |
- | |
| 202 | DirectoryEntry[file->directory_index].size = (u32) file->filesize; |
373 | /****************************************************************************************************************************************/ |
| Line 203... | Line 374... | ||
| 203 | DirectoryEntry[file->directory_index].time = (u16) time; |
374 | uint32_t Fat16ClusterToSector(uint16_t cluster) |
| - | 375 | { |
|
| 204 | DirectoryEntry[file->directory_index].date = (u16) date; |
376 | if(!Partition.IsValid) return 0; |
| 205 | SDC_PutSector((u32)file->directory_sector,file->buffer); |
- | |
| 206 | } |
377 | if (cluster < 2) cluster = 2; // the 0. and 1. cluster in the fat are used for the media descriptor |
| - | 378 | return ( (cluster - 2) * Partition.SectorsPerCluster) + Partition.FirstDataSector; // the first data sector is represented by the 2nd cluster |
|
| 207 | return(0); |
379 | } |
| - | 380 | ||
| 208 | } |
381 | /****************************************************************************************************************************************/ |
| 209 | - | ||
| 210 | //________________________________________________________________________________________________________________________________________ |
382 | /* Function: SectorToFat16Cluster( uint32_t sector); */ |
| 211 | // Funtion: fclose_(File *file); |
383 | /* */ |
| 212 | // |
384 | /* Description: This function converts a given sector number given to the corresponding */ |
| 213 | // Description: This function closes the open file by writing the remaining data from the buffer to the device and entering the filesize |
- | |
| 214 | // in the directory entry. |
- | |
| 215 | //________________________________________________________________________________________________________________________________________ |
- | |
| 216 | 385 | /* cluster number in the fat that represents this data area. */ |
|
| 217 | void fclose_(File *file) |
386 | /* */ |
| Line 218... | Line -... | ||
| 218 | { |
- | |
| 219 | if(file != NULL) |
- | |
| 220 | { |
- | |
| 221 | fflush_(file); // save buffered data to the disk |
- | |
| 222 | } |
- | |
| 223 | FreeFilePointer(file); // and free the filepointer. |
- | |
| 224 | } |
- | |
| 225 | - | ||
| Line -... | Line 387... | ||
| - | 387 | /* Returnvalue: The cluster number representing the data area of the sector. */ |
|
| - | 388 | /****************************************************************************************************************************************/ |
|
| - | 389 | uint16_t SectorToFat16Cluster(uint32_t sector) |
|
| - | 390 | { |
|
| - | 391 | if(!Partition.IsValid) return 0; |
|
| 226 | //________________________________________________________________________________________________________________________________________ |
392 | return ((uint16_t)((sector - Partition.FirstDataSector) / Partition.SectorsPerCluster) + 2); |
| - | 393 | } |
|
| - | 394 | ||
| 227 | // Funtion: u32 fread_(void *buffer, s32 size, s32 count, File *file); |
395 | |
| 228 | // |
396 | /****************************************************************************************************************************************/ |
| 229 | // Description: This function reads count objects of the specified size from the actual position of the file to the specified buffer. |
- | |
| 230 | // |
397 | /* Function: Fat16_Deinit(void); */ |
| 231 | // Returnvalue: The function returns the number of objects (not bytes) read from the file. |
- | |
| 232 | // |
- | |
| 233 | //________________________________________________________________________________________________________________________________________ |
398 | /* */ |
| 234 | - | ||
| 235 | u32 fread_(void *buffer, u32 size, u32 count, File *file) |
399 | /* Description: This function uninitializes the fat 16 api */ |
| 236 | { |
400 | /* */ |
| 237 | u32 object_cnt = 0; // count the number of objects read from the file. |
- | |
| 238 | u32 object_size = 0; // count the number of bytes read from the actual object. |
401 | /* Returnvalue: The function returns "0" on success */ |
| 239 | u8 *buff_pnt = 0; // a pointer to the actual bufferposition. |
402 | /****************************************************************************************************************************************/ |
| 240 | u8 success = 1; // no error occured during read operation to the file. |
403 | uint8_t Fat16_Deinit(void) |
| 241 | - | ||
| 242 | buff_pnt = (u8 *) buffer; // cast the void pointer to an u8 * |
- | |
| 243 | 404 | { |
|
| 244 | while((object_cnt < count) && success) |
- | |
| 245 | { |
- | |
| Line -... | Line 405... | ||
| - | 405 | int16_t returnvalue = 0; |
|
| - | 406 | uint8_t cnt; |
|
| 246 | object_size = size; |
407 | // declare the filepointers as unused. |
| - | 408 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
|
| 247 | while((size > 0) && success) |
409 | { |
| Line 248... | Line 410... | ||
| 248 | { |
410 | if(FilePointer[cnt].State == FSTATE_USED) |
| 249 | *buff_pnt = (u8) fgetchar_(file); // read a byte from the buffer to the opened file. |
411 | { |
| 250 | buff_pnt++; |
- | |
| - | 412 | returnvalue += fclose_(&FilePointer[cnt]); // try to close open file pointers |
|
| 251 | size--; |
413 | } |
| 252 | } |
- | |
| - | 414 | ||
| - | 415 | } |
|
| 253 | if(success) object_cnt++; |
416 | SDC_Deinit(); // uninitialize interface to sd-card |
| 254 | } |
- | |
| 255 | 417 | Partition.IsValid = 0; // mark data in partition structure as invalid |
|
| 256 | return(object_cnt); // return the number of objects succesfully read from the file |
- | |
| 257 | } |
418 | return(returnvalue); |
| 258 | 419 | } |
|
| 259 | //________________________________________________________________________________________________________________________________________ |
420 | |
| 260 | // Funtion: u32 fwrite_(void *buffer, s32 size, s32 count, File *file); |
421 | /****************************************************************************************************************************************/ |
| - | 422 | /* Function: Fat16_Init(void); */ |
|
| 261 | // |
423 | /* */ |
| - | 424 | /* Description: This function reads the Masterbootrecord and finds the position of the Volumebootrecord, the FAT and the Rootdir */ |
|
| 262 | // Description: This function writes count objects of the specified size from the buffer to the actual positon within the file. |
425 | /* and stores the information in global variables. */ |
| Line 263... | Line 426... | ||
| 263 | // |
426 | /* */ |
| - | 427 | /* Returnvalue: The function returns "0" if the filesystem is initialized. */ |
|
| Line 264... | Line 428... | ||
| 264 | // Returnvalue: The function returns the number of objects (not bytes) written to the file. |
428 | /****************************************************************************************************************************************/ |
| - | 429 | uint8_t Fat16_Init(void) |
|
| 265 | // |
430 | { |
| 266 | //________________________________________________________________________________________________________________________________________ |
- | |
| 267 | 431 | uint8_t cnt = 0; |
|
| 268 | u32 fwrite_(void *buffer, u32 size, u32 count, File *file) |
- | |
| 269 | { |
- | |
| 270 | u32 object_cnt = 0; // count the number of objects written to the file. |
- | |
| 271 | u32 object_size = 0; // count the number of bytes written from the actual object. |
- | |
| 272 | u8 *buff_pnt = 0; // a pointer to the actual bufferposition. |
- | |
| 273 | u8 success = 1; // no error occured during write operation to the file. |
- | |
| 274 | 432 | uint32_t partitionfirstsector; |
|
| - | 433 | VBR_Entry_t *VBR; |
|
| - | 434 | MBR_Entry_t *MBR; |
|
| Line 275... | Line -... | ||
| 275 | buff_pnt = (u8 *) buffer; // cast the void pointer to an u8 * |
- | |
| 276 | - | ||
| 277 | while((object_cnt < count) && success) |
- | |
| 278 | { |
- | |
| 279 | object_size = size; |
435 | File_t *file; |
| 280 | while((size > 0) && success) |
- | |
| 281 | { |
- | |
| 282 | success = fputchar_(file, *buff_pnt); // write a byte from the buffer to the opened file. |
- | |
| 283 | buff_pnt++; |
- | |
| 284 | size--; |
- | |
| 285 | } |
- | |
| 286 | if(success) object_cnt++; |
436 | uint8_t result = 0; |
| 287 | } |
437 | |
| 288 | 438 | printf("\r\n FAT16 init..."); |
|
| 289 | return(object_cnt); // return the number of objects succesfully written to the file |
439 | Partition.IsValid = 0; |
| 290 | } // (!!!!! objects and not bytes !!!!) |
440 | |
| - | 441 | // declare the filepointers as unused. |
|
| Line 291... | Line 442... | ||
| 291 | 442 | for(cnt = 0; cnt < FILE_MAX_OPEN; cnt++) |
|
| 292 | //________________________________________________________________________________________________________________________________________ |
443 | { |
| 293 | // Funtion: s16 fseek_(File *, s32, s16) |
444 | FilePointer[cnt].State = FSTATE_UNUSED; |
| - | 445 | } |
|
| 294 | // |
446 | // set current file pinter to first position in list |
| - | 447 | file = &FilePointer[0]; |
|
| 295 | // Description: This function sets the pointer of the stream relative to the position |
448 | |
| - | 449 | // try to initialise the sd-card. |
|
| 296 | // specified by origin (SEEK_SET, SEEK_CUR, SEEK_END). |
450 | if(SD_SUCCESS != SDC_Init()) |
| 297 | // |
451 | { |
| - | 452 | printf("SD-Card could not be initialized."); |
|
| 298 | //________________________________________________________________________________________________________________________________________ |
453 | result = 1; |
| - | 454 | goto end; |
|
| - | 455 | } |
|
| - | 456 | ||
| - | 457 | // SD-Card is initialized successfully |
|
| - | 458 | if(SD_SUCCESS != SDC_GetSector((uint32_t)MBR_SECTOR,file->Cache)) // Read the MasterBootRecord |
|
| 299 | 459 | { |
|
| - | 460 | printf("Error reading the MBR."); |
|
| - | 461 | result = 2; |
|
| - | 462 | goto end; |
|
| 300 | s16 fseek_(File *file, s32 offset, s16 origin) |
463 | } |
| 301 | { |
- | |
| 302 | s32 fposition = 0; |
464 | MBR = (MBR_Entry_t *)file->Cache; // Enter the MBR using the structure MBR_Entry_t. |
| 303 | s16 retvalue = 1; |
465 | if((MBR->PartitionEntry1.Type == PART_TYPE_FAT16_ST_32_MB) || |
| 304 | u32 temp = 0; |
466 | (MBR->PartitionEntry1.Type == PART_TYPE_FAT16_LT_32_MB) || |
| 305 | 467 | (MBR->PartitionEntry1.Type == PART_TYPE_FAT16LBA)) |
|
| Line 306... | Line -... | ||
| 306 | //...................................................... |
- | |
| 307 | if(origin == SEEK_SET) // Fileposition relative to the beginning of the file. |
- | |
| 308 | { |
468 | { |
| - | 469 | // get sector offset 1st partition |
|
| 309 | fposition = 0; |
470 | partitionfirstsector = MBR->PartitionEntry1.NoSectorsBeforePartition; |
| 310 | } |
471 | // Start of Partition is the Volume Boot Sector |
| 311 | //...................................................... |
472 | if(SD_SUCCESS != SDC_GetSector(partitionfirstsector,file->Cache)) // Read the volume boot record |
| 312 | else if(origin == SEEK_END) // Fileposition relative to the end of the file. |
473 | { |
| - | 474 | printf("Error reading the VBR."); |
|
| - | 475 | result = 3; |
|
| 313 | { |
476 | goto end; |
| - | 477 | } |
|
| 314 | fposition = (s32) file->filesize; |
478 | } |
| Line 315... | Line 479... | ||
| 315 | } |
479 | else // maybe the medium has no partition assuming sector 0 is the vbr |
| 316 | //...................................................... |
- | |
| 317 | else if(origin == SEEK_CUR) // Fileposition relative to the current position of the file. |
480 | { |
| 318 | { |
481 | partitionfirstsector = 0; |
| 319 | fposition = file->fileposition; |
- | |
| 320 | } |
482 | } |
| 321 | - | ||
| 322 | fposition += offset; |
- | |
| 323 | - | ||
| 324 | if((fposition >= 0) && (fposition <= (s32)file->filesize)) // is the pointer still within the file? |
483 | |
| 325 | { |
484 | VBR = (VBR_Entry_t *) file->Cache; // Enter the VBR using the structure VBR_Entry_t. |
| 326 | retvalue = 0; |
485 | if(VBR->BytesPerSector != BYTES_PER_SECTOR) |
| 327 | file->sector_index = 0; |
- | |
| 328 | file->byte_index = 0; |
486 | { |
| 329 | file->fileposition = 0; |
- | |
| 330 | file->cluster_pointer = file->start_cluster; |
487 | printf("VBR: Sector size not supported."); |
| 331 | 488 | result = 4; |
|
| 332 | while(file->fileposition < fposition) |
489 | goto end; |
| 333 | { |
- | |
| 334 | file->fileposition++; |
- | |
| 335 | if(file->byte_index < 511) |
- | |
| 336 | { |
490 | } |
| 337 | file->byte_index++; |
491 | Partition.SectorsPerCluster = VBR->SectorsPerCluster; // Number of sectors per cluster. Depends on the memorysize of the sd-card. |
| 338 | } |
492 | Partition.FatCopies = VBR->NoFATCopies; // Number of fatcopies. |
| 339 | else |
- | |
| - | 493 | Partition.MaxRootEntries = VBR->MaxRootEntries; // How many Entries are possible in the rootdirectory (FAT16 allows max. 512 entries). |
|
| 340 | { |
494 | Partition.SectorsPerFat = VBR->SectorsPerFAT; // The number of sectors per FAT. |
| 341 | file->byte_index=0; // reading at the beginning of new sector. |
495 | |
| - | 496 | /* Calculate the sectorpositon of the FAT, the Rootdirectory and the first Datacluster. */ |
|
| - | 497 | // Calculate the position of the FileAllocationTable: |
|
| - | 498 | // Start + # of Reserved Sectors |
|
| - | 499 | Partition.FirstFatSector = (uint32_t)(partitionfirstsector + (uint32_t)(VBR->ReservedSectors)); |
|
| - | 500 | // Calculate the position of the Rootdirectory: |
|
| - | 501 | // Start + # of Reserved Sectors + (# of Sectors Per FAT * # of FAT Copies) |
|
| - | 502 | Partition.FirstRootDirSector = Partition.FirstFatSector + (uint32_t)((uint32_t)Partition.SectorsPerFat*(uint32_t)Partition.FatCopies); |
|
| - | 503 | // Calculate the position of the first datacluster: |
|
| - | 504 | // Start + # of Reserved + (# of Sectors Per FAT * # of FAT Copies) + ((Maximum Root Directory Entries * 32) / Bytes per Sector) |
|
| - | 505 | Partition.FirstDataSector = Partition.FirstRootDirSector + (uint32_t)(Partition.MaxRootEntries>>4); // assuming 512 Byte Per Sector |
|
| - | 506 | // Calculate the last data sector |
|
| - | 507 | if(VBR->NoSectors == 0) |
|
| - | 508 | { |
|
| 342 | file->sector_index++; // continue reading in next sector |
509 | printf("VBR: Bad number of sectors."); |
| 343 | if(file->sector_index >= SectorsPerCluster) // When end of cluster is reached, the next datacluster has to be searched in the FAT. |
510 | result = 5; |
| Line 344... | Line -... | ||
| 344 | { |
- | |
| 345 | if(file->fileposition < fposition) |
- | |
| 346 | { |
- | |
| 347 | file->sector_index = 0; // start reading new cluster at first sector of the cluster. |
- | |
| 348 | GetNextCluster(file); // Sets the clusterpointer of the file to the next datacluster. |
- | |
| 349 | } |
- | |
| 350 | } |
- | |
| Line -... | Line 511... | ||
| - | 511 | goto end; |
|
| - | 512 | } |
|
| - | 513 | Partition.LastDataSector = Partition.FirstDataSector + VBR->NoSectors - 1; |
|
| - | 514 | // check for FAT16 in VBR of first partition |
|
| - | 515 | if(!((VBR->FATName[0]=='F') && (VBR->FATName[1]=='A') && (VBR->FATName[2]=='T') && (VBR->FATName[3]=='1')&&(VBR->FATName[4]=='6'))) |
|
| - | 516 | { |
|
| - | 517 | printf("VBR: Partition ist not FAT16 type."); |
|
| - | 518 | result = 6; |
|
| 351 | } |
519 | goto end; |
| 352 | } |
520 | } |
| 353 | if(file->byte_index) |
521 | Partition.IsValid = 1; // mark data in partition structure as valid |
| 354 | { |
522 | result = 0; |
| Line 355... | Line -... | ||
| 355 | temp = (u32)((u32)file->cluster_pointer + (u32)file->sector_index); |
- | |
| 356 | SDC_GetSector((u32)temp,file->buffer); // FileBuffer will be written at once at the end of the cluster and has to be updated. |
- | |
| 357 | } |
- | |
| 358 | } |
523 | end: |
| Line -... | Line 524... | ||
| - | 524 | if(result != 0) Fat16_Deinit(); |
|
| - | 525 | else printf(" ...ok"); |
|
| - | 526 | return(result); |
|
| 359 | return(retvalue); |
527 | } |
| - | 528 | ||
| 360 | } |
529 | |
| 361 | 530 | ||
| 362 | //________________________________________________________________________________________________________________________________________ |
531 | /****************************************************************************************************************************************/ |
| 363 | // Funtion: fgetchar_(File *file); |
532 | /* Function: ClearCurrCluster(File_t*); */ |
| - | 533 | /* */ |
|
| 364 | // |
534 | /* Description: This function fills the current cluster with 0. */ |
| 365 | // Description: This function reads and returns one character from the specified file. |
- | |
| - | 535 | /* */ |
|
| Line -... | Line 536... | ||
| - | 536 | /* Returnvalue: The function returns 1 on success else 0. */ |
|
| - | 537 | /****************************************************************************************************************************************/ |
|
| - | 538 | uint8_t ClearCurrCluster(File_t * file) |
|
| - | 539 | { |
|
| - | 540 | uint8_t retvalue = 1; |
|
| - | 541 | uint32_t i; |
|
| - | 542 | ||
| - | 543 | if((!Partition.IsValid) || (file == NULL)) return(0); |
|
| - | 544 | ||
| - | 545 | for(i = 0; i < BYTES_PER_SECTOR; i++) file->Cache[i] = 0; // clear file cache |
|
| - | 546 | for(i = 0; i < Partition.SectorsPerCluster; i++) |
|
| - | 547 | { |
|
| - | 548 | file->SectorInCache = file->FirstSectorOfCurrCluster + i; |
|
| - | 549 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
|
| - | 550 | { |
|
| - | 551 | Fat16_Deinit(); |
|
| - | 552 | retvalue = 0; |
|
| - | 553 | } |
|
| - | 554 | } |
|
| - | 555 | return(retvalue); |
|
| - | 556 | } |
|
| - | 557 | ||
| - | 558 | /*****************************************************************************************************************************************/ |
|
| - | 559 | /* Function: GetNextCluster(File_t* ); */ |
|
| - | 560 | /* */ |
|
| - | 561 | /* Description: This function finds the next datacluster of the file specified with File *File. */ |
|
| - | 562 | /* */ |
|
| - | 563 | /* Returnvalue: The function returns the next cluster or 0 if the last cluster has already reached. */ |
|
| 366 | // |
564 | /*****************************************************************************************************************************************/ |
| - | 565 | uint16_t GetNextCluster(File_t * file) |
|
| - | 566 | { |
|
| - | 567 | uint16_t cluster = 0; |
|
| - | 568 | uint32_t fat_byte_offset, sector, byte; |
|
| - | 569 | Fat16Entry_t * fat; |
|
| - | 570 | ||
| - | 571 | if((!Partition.IsValid) || (file == NULL)) return(cluster); |
|
| - | 572 | // if sector is within the data area |
|
| - | 573 | if((Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)&& (file->FirstSectorOfCurrCluster <= Partition.LastDataSector)) |
|
| - | 574 | { |
|
| - | 575 | // determine current file cluster |
|
| 367 | // Returnvalue: The function returns the character read from the specified memorylocation as u8 casted to s16 or EOF. |
576 | cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); |
| 368 | //________________________________________________________________________________________________________________________________________ |
577 | // calculate byte offset in the fat for corresponding entry |
| 369 | 578 | fat_byte_offset = ((uint32_t)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
|
| 370 | s16 fgetchar_(File *file) |
579 | // calculate the sector that contains the current cluster within the fat |
| 371 | { |
580 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
| 372 | s16 c = EOF; |
581 | // calculate byte offset of the current cluster within that fat sector |
| 373 | u32 temp1; |
582 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
| 374 | - | ||
| 375 | if(file->filesize > 0) // wen the end of the file is not reached, get the next character. |
- | |
| 376 | { |
583 | // read this sector to the file cache |
| 377 | temp1 = (u32)file->cluster_pointer; // calculate the adress of the next character to be read. |
- | |
| 378 | temp1 += (u32)file->sector_index; |
- | |
| 379 | 584 | if(file->SectorInCache != sector) |
|
| 380 | if(file->sector_in_buffer != temp1) // Has the content of the buffer been modified and has to be updated? |
585 | { |
| 381 | { |
586 | file->SectorInCache = sector; // update sector stored in buffer |
| 382 | SDC_GetSector((u32)temp1,file->buffer); // Read the calculated cluster. |
587 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
| Line 383... | Line -... | ||
| 383 | file->sector_in_buffer = (u32)temp1; |
- | |
| 384 | } |
- | |
| 385 | c = (s16) file->buffer[file->byte_index]; |
- | |
| 386 | file->filesize--; // decrement the number of characters available. |
- | |
| 387 | - | ||
| 388 | if(file->byte_index < 511) // continue reading from this sector until the end of the sector is reached. |
- | |
| 389 | { |
- | |
| Line -... | Line 588... | ||
| - | 588 | { |
|
| - | 589 | Fat16_Deinit(); |
|
| - | 590 | return (cluster); |
|
| - | 591 | } |
|
| - | 592 | } |
|
| - | 593 | // read the next cluster from cache |
|
| - | 594 | fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
|
| 390 | file->byte_index++; |
595 | cluster = fat->NextCluster; |
| 391 | } |
596 | // if last cluster fat entry |
| - | 597 | if(FAT16_CLUSTER_LAST_MIN <= cluster) |
|
| 392 | else // has the end of an sector been reached-> |
598 | { |
| - | 599 | cluster = 0; |
|
| - | 600 | } |
|
| 393 | { |
601 | else |
| Line 394... | Line -... | ||
| 394 | file->byte_index=0; // continue reading at the beginning - |
- | |
| 395 | file->sector_index++; // of new sector. |
- | |
| 396 | if(file->sector_index >= SectorsPerCluster) // When the end of an cluster is reached, the next datacluster has to be searched in the FAT. |
602 | { |
| 397 | { |
- | |
| 398 | file->sector_index = 0; // start reading new cluster at first sector of the cluster. |
- | |
| Line 399... | Line -... | ||
| 399 | GetNextCluster(file); // Sets the clusterpointer of the file to the next datacluster. |
- | |
| 400 | } |
- | |
| 401 | } |
603 | file->FirstSectorOfCurrCluster = Fat16ClusterToSector(cluster); |
| 402 | } |
604 | file->SectorOfCurrCluster = 0; |
| 403 | return(c); |
- | |
| 404 | } |
- | |
| 405 | - | ||
| 406 | //________________________________________________________________________________________________________________________________________ |
605 | file->ByteOfCurrSector = 0; |
| 407 | // Funtion: fputchar_(File *file, s8 *); |
- | |
| 408 | // |
606 | } |
| 409 | // Description: This function writes a byte to the specified file and takes care of writing the necessary FAT- Entries. |
607 | } |
| 410 | // |
- | |
| 411 | // Returnvalue: The function returns a value of 0 if the data could not be written. |
- | |
| 412 | //________________________________________________________________________________________________________________________________________ |
- | |
| 413 | 608 | return(cluster); |
|
| 414 | u8 fputchar_(File *file,s8 c) |
- | |
| 415 | { |
609 | } |
| 416 | u32 ul_temp = 0; |
610 | |
| 417 | u8 retvalue = 1; |
611 | |
| 418 | 612 | /****************************************************************************************************************************************/ |
|
| 419 | if(file->sector_index >= SectorsPerCluster) // if end of the cluster is reached, find next free cluster |
613 | /* Function: FindNextFreeCluster(File_t *); */ |
| 420 | { |
- | |
| 421 | file->sector_index = 0; |
- | |
| 422 | if(!AppendCluster(file)) retvalue = 0; // append a new and free cluster at the end of the file. |
- | |
| 423 | } |
- | |
| 424 | - | ||
| 425 | file->buffer[file->byte_index] = c; // write databyte into the buffer. The byte will be written to the device at once |
- | |
| 426 | if(file->filesize == file->fileposition) file->filesize++; // a character has been written to the file so the size is inkremented but only when the character has been added at the end of the file. |
- | |
| 427 | file->fileposition++; // the actual positon within the file. |
- | |
| 428 | // if the buffer contains the complete sectordata. |
- | |
| 429 | if(file->byte_index < 511) // if the end of this sector is not reached yet |
- | |
| 430 | { |
- | |
| 431 | file->byte_index++; // the next byte will be written to the next byteposition in this sector. |
- | |
| 432 | } |
- | |
| 433 | else // otherwise the data in the sectorbuffer will be written to the device and the next sector will be selected. |
- | |
| Line 434... | Line -... | ||
| 434 | { |
- | |
| 435 | ul_temp = (u32)file->cluster_pointer; |
- | |
| 436 | ul_temp += (u32)file->sector_index; |
- | |
| 437 | - | ||
| 438 | SDC_PutSector((u32)ul_temp,file->buffer); |
- | |
| 439 | file->byte_index=0; // and the next byte will be written at the beginning of this new sector. |
- | |
| 440 | file->sector_index++; |
- | |
| 441 | if(file->sector_index >= SectorsPerCluster) // if end of the cluster is reached, find next free cluster |
- | |
| 442 | { |
- | |
| 443 | file->sector_index = 0; |
614 | /* */ |
| 444 | if(!AppendCluster(file)) retvalue = 0; // append a new and free cluster at the end of the file. |
- | |
| 445 | } |
- | |
| 446 | } |
- | |
| 447 | return(retvalue); |
- | |
| 448 | } |
- | |
| 449 | - | ||
| 450 | //________________________________________________________________________________________________________________________________________ |
- | |
| 451 | // Funtion: fputs_(File *file, s8 *string); |
- | |
| 452 | // |
- | |
| 453 | // Description: This function writes a string to the specified file. |
- | |
| 454 | // |
- | |
| Line 455... | Line 615... | ||
| 455 | //________________________________________________________________________________________________________________________________________ |
615 | /* Description: This function looks in the fat to find the next free cluster */ |
| 456 | - | ||
| 457 | u8 fputs_(File *file,s8 * string) |
- | |
| 458 | { |
- | |
| 459 | u8 i=0; |
616 | /* */ |
| 460 | - | ||
| 461 | while(string[i] != 0) |
617 | /* Returnvalue: The function returns the cluster number of the next free cluster found within the fat. */ |
| 462 | { |
618 | /****************************************************************************************************************************************/ |
| 463 | fputchar_(file,string[i]); |
- | |
| 464 | i++; |
- | |
| 465 | } |
619 | uint16_t FindNextFreeCluster(File_t *file) |
| - | 620 | { |
|
| 466 | return(0); |
621 | uint32_t fat_sector; // current sector within the fat relative to the first sector of the fat. |
| 467 | } |
622 | uint32_t curr_sector; // current sector |
| - | 623 | uint16_t fat_entry; // index to an fatentry within the actual sector (256 fatentries are possible within one sector). |
|
| 468 | 624 | uint16_t free_cluster = 0; // next free cluster number. |
|
| 469 | //________________________________________________________________________________________________________________________________________ |
625 | Fat16Entry_t * fat; |
| - | 626 | ||
| 470 | // Funtion: s8 * fgets_(s8 *string, s16 count, File *file) |
627 | if((!Partition.IsValid) || (file == NULL)) return(0); |
| 471 | // |
628 | |
| 472 | // Description: This function reads a string from the file to the specifies string. |
629 | // start searching for an empty cluster at the beginning of the fat. |
| 473 | // |
630 | fat_sector = 0; |
| 474 | // Returnvalue: A pointer to the string written from the file. |
- | |
| 475 | //________________________________________________________________________________________________________________________________________ |
- | |
| 476 | - | ||
| 477 | s8 * fgets_(s8 *string, s16 count, File *file) |
631 | do |
| 478 | { |
632 | { |
| 479 | s16 buff_pnt = 0; |
633 | curr_sector = Partition.FirstFatSector + fat_sector; // calculate sector to read |
| Line 480... | Line -... | ||
| 480 | s16 buff_tmp = 0; |
- | |
| 481 | u8 state = 0; // Variable used for a statemachine to recognize the end of a line. |
- | |
| 482 | - | ||
| 483 | while(count > 1) // read the count-1 characters from the file to the string. |
- | |
| 484 | { |
- | |
| 485 | buff_tmp = fgetchar_(file); // read a character from the opened file. |
- | |
| 486 | switch(state) |
- | |
| 487 | { |
- | |
| 488 | case 0: |
- | |
| Line -... | Line 634... | ||
| - | 634 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
|
| - | 635 | if( SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector of fat from sd-card. |
|
| - | 636 | { |
|
| - | 637 | Fat16_Deinit(); |
|
| - | 638 | return(free_cluster); |
|
| - | 639 | } |
|
| - | 640 | ||
| 489 | if(buff_tmp == 0x0D) state++; |
641 | fat = (Fat16Entry_t *)file->Cache; // set fat pointer to file cache |
| 490 | break; |
642 | |
| 491 | 643 | 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. |
|
| 492 | case 1: |
- | |
| 493 | if(buff_tmp == 0x0A) |
644 | { |
| Line -... | Line 645... | ||
| - | 645 | if(fat[fat_entry].NextCluster == FAT16_CLUSTER_FREE) // empty cluster found!! |
|
| 494 | { |
646 | { |
| 495 | count = 1; |
647 | fat[fat_entry].NextCluster = FAT16_CLUSTER_LAST_MAX; // mark this fat-entry as used |
| 496 | } |
648 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // and save the sector at the sd-card. |
| 497 | state = 0; |
- | |
| 498 | break; |
649 | { |
| 499 | } |
650 | Fat16_Deinit(); |
| - | 651 | return(free_cluster); |
|
| - | 652 | } |
|
| 500 | if(buff_tmp == EOF) {buff_tmp = 0; count = 1;} // is the end of the file reached, terminate the string with zero. |
653 | free_cluster = (uint16_t)(fat_sector * FAT16_ENTRIES_PER_SECTOR + (uint32_t)fat_entry); |
| - | 654 | fat_entry = FAT16_ENTRIES_PER_SECTOR; // terminate the search for a free cluster in this sector. |
|
| 501 | string[buff_pnt] = (s8) buff_tmp; |
655 | } |
| 502 | count--; |
- | |
| 503 | buff_pnt++; |
656 | } |
| 504 | } |
- | |
| 505 | string[buff_pnt] = 0; |
- | |
| 506 | return(string); |
- | |
| 507 | } |
- | |
| 508 | 657 | fat_sector++; // continue the search in next fat sector |
|
| 509 | //________________________________________________________________________________________________________________________________________ |
658 | // repeat until the end of the fat is reached and no free cluster has been found so far |
| 510 | // Funtion: u8 fexist_(u8*, File *file); |
- | |
| Line 511... | Line -... | ||
| 511 | // |
- | |
| 512 | // Description: This function searches the specified file and returns 0 if the file was not found. |
- | |
| 513 | // |
- | |
| 514 | // |
- | |
| 515 | // Return: 0 = file does not exist |
- | |
| 516 | // 1 = file exists |
- | |
| 517 | //________________________________________________________________________________________________________________________________________ |
- | |
| 518 | - | ||
| 519 | u8 fexist_(s8 *fname) |
- | |
| 520 | { |
- | |
| 521 | File *file; |
- | |
| 522 | 659 | }while((fat_sector < Partition.SectorsPerFat) && (!free_cluster)); |
|
| 523 | file = ReserveFilePointer(); |
- | |
| 524 | - | ||
| 525 | if(file != NULL) |
- | |
| 526 | { |
- | |
| 527 | if((file = fopen_(fname,'r'))!= NULL) |
- | |
| 528 | { |
- | |
| 529 | fclose_(file); |
- | |
| 530 | return(1); |
- | |
| 531 | } |
- | |
| 532 | else |
- | |
| 533 | { |
- | |
| 534 | return(0); |
- | |
| 535 | } |
- | |
| 536 | } |
- | |
| 537 | else |
- | |
| 538 | { |
- | |
| 539 | return(0); |
- | |
| 540 | } |
- | |
| 541 | } |
- | |
| 542 | - | ||
| 543 | //________________________________________________________________________________________________________________________________________ |
- | |
| 544 | // Funtion: GetNextCluster(File *file); |
- | |
| 545 | // |
- | |
| 546 | // Description: This function finds the next datacluster of the file specified with File *file. |
- | |
| 547 | // |
- | |
| 548 | // Returnvalue: The function returns "0" if the last cluster has already been reached. |
- | |
| Line -... | Line 660... | ||
| - | 660 | return(free_cluster); |
|
| - | 661 | } |
|
| - | 662 | ||
| - | 663 | ||
| - | 664 | /****************************************************************************************************************************************************/ |
|
| - | 665 | /* Function: int16_t fseek_(File_t *, int32_t *, uint8_t) */ |
|
| - | 666 | /* */ |
|
| - | 667 | /* Description: This function sets the pointer of the stream relative to the position */ |
|
| 549 | //________________________________________________________________________________________________________________________________________ |
668 | /* specified by origin (SEEK_SET, SEEK_CUR, SEEK_END) */ |
| 550 | 669 | /* Returnvalue: Is 1 if seek was successful */ |
|
| - | 670 | /****************************************************************************************************************************************************/ |
|
| - | 671 | int16_t fseek_(File_t *file, int32_t offset, int16_t origin) |
|
| - | 672 | { |
|
| - | 673 | int32_t fposition = 0; |
|
| 551 | u16 GetNextCluster(File *file) |
674 | int16_t retvalue = 1; |
| 552 | { |
675 | |
| - | 676 | if((!Partition.IsValid) || (file == NULL)) return(0); |
|
| - | 677 | switch(origin) |
|
| - | 678 | { |
|
| - | 679 | case SEEK_SET: // Fileposition relative to the beginning of the file. |
|
| - | 680 | fposition = 0; |
|
| - | 681 | break; |
|
| - | 682 | case SEEK_END: // Fileposition relative to the end of the file. |
|
| - | 683 | fposition = (int32_t)file->Size; |
|
| - | 684 | break; |
|
| - | 685 | case SEEK_CUR: // Fileposition relative to the current position of the file. |
|
| - | 686 | default: |
|
| - | 687 | fposition = file->Position; |
|
| - | 688 | break; |
|
| 553 | u32 fat_pointer = 0; |
689 | } |
| 554 | u32 fat_sector_offset = 0; |
690 | |
| - | 691 | fposition += offset; |
|
| 555 | u32 ul_tmp = 0; |
692 | |
| 556 | u8 retvalue = 0; // no new cluster found yet. |
693 | if((fposition >= 0) && (fposition <= (int32_t)file->Size)) // is the pointer still within the file? |
| Line 557... | Line -... | ||
| 557 | - | ||
| 558 | - | ||
| 559 | if((file->cluster_pointer >= RootDirectory) && (file->cluster_pointer < (RootDirectory + 31))) |
- | |
| 560 | { // Is the next cluster searched within the rootdirectory and available? |
- | |
| 561 | file->cluster_pointer++; // the rootdirectory is a linear adress space of 32 clusters. |
- | |
| 562 | retvalue = 1; // and the next cluster has been found. |
- | |
| 563 | } |
- | |
| 564 | else if(file->cluster_pointer > (RootDirectory + 31)) // The specified cluster is within the FAT. |
- | |
| 565 | { |
- | |
| 566 | fat_sector_offset = ((file->cluster_pointer) - (FirstDataCluster)); // Calculate index of actual cluster within the FAT. |
- | |
| 567 | fat_sector_offset /= SectorsPerCluster; // calculate the index of the actual sector within the FAT. |
- | |
| 568 | fat_sector_offset += 2; // In Fat16 clusterpositions have an offset of two. |
- | |
| 569 | fat_pointer = (fat_sector_offset%0x100); // Calculate the sector within the cluster. |
- | |
| 570 | fat_sector_offset = (fat_sector_offset>>8); // and the position within the sector. |
- | |
| 571 | - | ||
| 572 | SDC_GetSector((u32)(FileAllocationTable + fat_sector_offset),file->buffer); |
- | |
| 573 | file->sector_in_buffer = (FileAllocationTable + fat_sector_offset); // Mark that new sector has been read. |
- | |
| 574 | - | ||
| 575 | ul_tmp = (u32)file->buffer[((fat_pointer << 1)+1)]; // Read next sector information from calculated clusterposition. |
- | |
| 576 | ul_tmp = (ul_tmp << 8); |
- | |
| 577 | ul_tmp |= (u32)file->buffer[(fat_pointer << 1)]; |
- | |
| 578 | ul_tmp -=2; // next datacluster is clusterposition in fat - 2. |
- | |
| 579 | ul_tmp *= SectorsPerCluster; // calculate sectorposition of new cluster |
- | |
| 580 | ul_tmp += FirstDataCluster; // in relation to first datacluster of the disk. |
- | |
| 581 | - | ||
| 582 | if(ul_tmp < 0xfff7) // has a new cluster been read or was the end of the fat reached? |
- | |
| 583 | { |
- | |
| 584 | file->cluster_pointer = (u32) ul_tmp; // continue reading the file at the beginning of new datacluster. |
- | |
| 585 | retvalue = 1; // a new cluster was found. |
- | |
| 586 | } |
- | |
| 587 | } |
- | |
| 588 | return(retvalue); |
- | |
| 589 | } |
- | |
| 590 | - | ||
| 591 | //________________________________________________________________________________________________________________________________________ |
- | |
| 592 | // Funtion: u16 FindNextFreeCluster(void) |
- | |
| 593 | // |
- | |
| 594 | // Description: This function looks in the FAT to find the next free datacluster |
- | |
| 595 | // |
- | |
| 596 | // Returnvalue: The function returns the adress of the next free cluster found within the fAT. |
- | |
| 597 | //________________________________________________________________________________________________________________________________________ |
- | |
| 598 | - | ||
| 599 | u16 FindNextFreeCluster(File *file) |
- | |
| 600 | { |
- | |
| 601 | u32 fat_pointer = 0; // Pointer to the first sector of the FAT. |
- | |
| 602 | u32 ul_tmp = 0; // temporary variable used to calculate a sectornumber. |
- | |
| 603 | u16 fat_sector_offset = 0; // index to a sector within the FAT. |
- | |
| 604 | u16 fat_entry = 0; // index to an fatentry within the actual sector (256 fatentries are possible within one sector). |
- | |
| 605 | u16 free_cluster = 0; // a pointer to the first sector of the next free cluster. |
- | |
| 606 | - | ||
| 607 | fat_pointer = (u32) FileAllocationTable; // start searching for empty cluster at the beginning of the fat. |
- | |
| 608 | // if the end of the fat is not reached yet and no free cluster has been found |
- | |
| 609 | while((fat_sector_offset < SectorsPerFat) && (!free_cluster)) |
- | |
| 610 | { |
- | |
| 611 | ul_tmp = (u32) ((u32)fat_pointer + (u32)fat_sector_offset); |
- | |
| 612 | SDC_GetSector((u32)ul_tmp,file->buffer); // read next sector of FAT. |
- | |
| 613 | file->sector_in_buffer = ul_tmp; // remember the number of the sector in FileBuffer. |
- | |
| 614 | Fat = (struct FatEntry *)file->buffer; |
- | |
| 615 | for(fat_entry=0;fat_entry<256;fat_entry++) // look for an free cluster at all entries in this sector of the fat. |
- | |
| 616 | { |
- | |
| 617 | if(Fat[fat_entry].next_cluster == 0x0000) // empty cluster found!! |
- | |
| 618 | { |
- | |
| 619 | Fat[fat_entry].next_cluster = 0xffff; // mark this fat-entry as used and save it to the device. |
- | |
| 620 | SDC_PutSector((u32)file->sector_in_buffer,file->buffer); |
- | |
| 621 | free_cluster = fat_entry; // the relative position of the free cluster found in this sector of the FAT. |
- | |
| 622 | free_cluster += (fat_sector_offset << 8); // calculate the absolute position of the free cluster in the FAT; |
- | |
| 623 | fat_entry = 256; // terminate the search for a free cluster in this sector. |
- | |
| 624 | } |
- | |
| 625 | } |
- | |
| 626 | fat_sector_offset++; |
- | |
| 627 | } |
- | |
| 628 | return(free_cluster); |
- | |
| 629 | } |
- | |
| 630 | - | ||
| 631 | //________________________________________________________________________________________________________________________________________ |
- | |
| 632 | // Funtion: u16 AppendCluster(File *file); |
- | |
| 633 | // |
- | |
| 634 | // Description: This function finds the next free datacluster on the disk and appends it to the specified file. |
- | |
| 635 | // |
- | |
| 636 | // Returnvalue: This funktion returns 1 if a cluster was appended to the specified file. |
- | |
| 637 | //________________________________________________________________________________________________________________________________________ |
- | |
| 638 | - | ||
| 639 | u8 AppendCluster(File *file) |
- | |
| 640 | { |
- | |
| 641 | u16 free_cluster = 0; |
- | |
| 642 | u32 fat_pointer = 0; |
- | |
| 643 | u8 retvalue = 0; |
- | |
| 644 | - | ||
| 645 | free_cluster = FindNextFreeCluster(file); // the next free cluster found on the disk. |
- | |
| 646 | if(free_cluster) retvalue = 1; // A free cluster was found and can be added to the end of the file. |
- | |
| 647 | fat_pointer = FileAllocationTable; // Set Pointer to the beginnig of the FAT. |
- | |
| 648 | fat_pointer += (u32)((u32)GetFatClusterOffset(file) >> 8); // find the sector in the FAT with 256 entries per sector. |
- | |
| 649 | - | ||
| 650 | SDC_GetSector(fat_pointer,file->buffer); |
- | |
| Line -... | Line 694... | ||
| - | 694 | { |
|
| - | 695 | // reset file position to start of the file |
|
| - | 696 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
|
| - | 697 | file->SectorOfCurrCluster = 0; |
|
| - | 698 | file->ByteOfCurrSector = 0; |
|
| - | 699 | file->Position = 0; |
|
| - | 700 | ||
| - | 701 | while(file->Position < fposition) // repeat until the current position is less than target |
|
| - | 702 | { |
|
| - | 703 | file->Position++; // increment file position |
|
| - | 704 | file->ByteOfCurrSector++; // next byte in current sector |
|
| - | 705 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) |
|
| - | 706 | { |
|
| - | 707 | file->ByteOfCurrSector = 0; // reading at the beginning of new sector. |
|
| - | 708 | file->SectorOfCurrCluster++; // continue reading in next sector |
|
| - | 709 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster) // if end of cluster is reached, the next datacluster has to be searched in the FAT. |
|
| - | 710 | { |
|
| - | 711 | if(GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
|
| - | 712 | { |
|
| - | 713 | file->SectorOfCurrCluster = 0; |
|
| - | 714 | } |
|
| - | 715 | else // the last cluster was allready reached |
|
| - | 716 | { |
|
| - | 717 | file->SectorOfCurrCluster--; // jump back to the ast sector in the last cluster |
|
| 651 | Fat = (struct FatEntry *)file->buffer; |
718 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set ByteOfCurrSector one byte over sector end |
| 652 | Fat[GetFatSectorIndex(file)].next_cluster = free_cluster; // append the free cluster to the end of the file in the FAT. |
719 | } |
| 653 | SDC_PutSector((u32)fat_pointer,file->buffer); // save the modified sector to the FAT. |
720 | } |
| 654 | 721 | } |
|
| - | 722 | } |
|
| 655 | fat_pointer = (u32)free_cluster; |
723 | } |
| 656 | fat_pointer -= 2; |
724 | if(file->Position == fposition) retvalue = 0; |
| 657 | fat_pointer *= SectorsPerCluster; |
725 | return(retvalue); |
| - | 726 | } |
|
| 658 | fat_pointer += FirstDataCluster; |
727 | |
| 659 | - | ||
| 660 | file->cluster_pointer = fat_pointer; // continue wrtiting to the file in the new and free datacluster. |
728 | |
| 661 | return(retvalue); // return 1 when a new cluster was appended to the file |
729 | /****************************************************************************************************************************************/ |
| - | 730 | /* Function: uint16_t DeleteClusterChain(File *file); */ |
|
| Line 662... | Line 731... | ||
| 662 | } |
731 | /* */ |
| - | 732 | /* Description: This function trances along a cluster chain in the fat and frees all clusters visited. */ |
|
| 663 | 733 | /* */ |
|
| - | 734 | /****************************************************************************************************************************************/ |
|
| 664 | 735 | uint8_t DeleteClusterChain(uint16_t StartCluster) |
|
| - | 736 | { |
|
| - | 737 | uint16_t cluster; |
|
| - | 738 | uint32_t fat_byte_offset, sector, byte; |
|
| 665 | //________________________________________________________________________________________________________________________________________ |
739 | Fat16Entry_t * fat; |
| 666 | // Funtion: void DeleteClusterChain(u16 startcluster); |
740 | uint8_t buffer[BYTES_PER_SECTOR]; |
| 667 | // |
741 | uint32_t sector_in_buffer = 0; |
| 668 | // Description: This function frees all the clusters used for file from the fat. |
742 | uint8_t repeat = 0; |
| 669 | // |
743 | |
| 670 | // Returnvalue: none |
- | |
| 671 | //________________________________________________________________________________________________________________________________________ |
- | |
| 672 | - | ||
| 673 | void DeleteClusterChain(u16 startcluster) |
- | |
| 674 | { |
- | |
| 675 | u16 fat_index = 0; |
- | |
| 676 | u16 fat_sector_offset = 0; |
- | |
| 677 | u32 sector_in_buffer = 0; |
- | |
| 678 | u32 ul_temp = 0; |
- | |
| 679 | u8 buffer[512]; |
- | |
| 680 | - | ||
| 681 | fat_index = (startcluster % 0x100); // Calculate the sector within the cluster. |
- | |
| 682 | fat_sector_offset = (startcluster >> 8); // and the position within the sector. |
- | |
| 683 | ul_temp = (u32)(FileAllocationTable + fat_sector_offset); |
- | |
| 684 | - | ||
| 685 | - | ||
| 686 | do |
- | |
| 687 | { |
- | |
| 688 | if(sector_in_buffer != ul_temp) |
- | |
| 689 | { |
- | |
| 690 | sector_in_buffer = ul_temp; |
- | |
| 691 | SDC_GetSector(ul_temp,buffer); |
- | |
| 692 | } |
- | |
| 693 | Fat = (struct FatEntry *)buffer; |
- | |
| 694 | - | ||
| 695 | startcluster = Fat[fat_index].next_cluster; |
- | |
| 696 | Fat[fat_index].next_cluster = 0x0000; // free the cluster within the fat. |
- | |
| 697 | - | ||
| 698 | fat_index = (startcluster % 0x100); // Calculate the sector within the cluster. |
- | |
| 699 | fat_sector_offset = (startcluster >> 8); // and the position within the sector. |
- | |
| 700 | ul_temp = (u32)(FileAllocationTable + fat_sector_offset); |
- | |
| 701 | if((sector_in_buffer != ul_temp) || (startcluster == 0xffff)) |
744 | if(!Partition.IsValid) return 0; |
| 702 | { |
- | |
| 703 | SDC_PutSector(sector_in_buffer,buffer); |
- | |
| 704 | } |
- | |
| Line 705... | Line 745... | ||
| 705 | } |
745 | |
| 706 | while(startcluster != 0xffff); // last cluster has been deleted. |
746 | cluster = StartCluster; // init chain trace |
| Line 707... | Line -... | ||
| 707 | } |
- | |
| 708 | - | ||
| 709 | - | ||
| 710 | //________________________________________________________________________________________________________________________________________ |
- | |
| 711 | // Funtion: u16 GetFatClusterIndex(File *file); |
- | |
| 712 | // |
- | |
| 713 | // Description: This function returns the clusterindex of the cluster specified by file->cluster_pointer of the specified file. |
- | |
| 714 | // |
- | |
| 715 | //________________________________________________________________________________________________________________________________________ |
- | |
| 716 | - | ||
| 717 | u16 GetFatClusterOffset(File *file) |
- | |
| 718 | { |
- | |
| Line -... | Line 747... | ||
| - | 747 | // calculate byte offset in the fat for corresponding entry |
|
| - | 748 | fat_byte_offset = ((uint32_t)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
|
| - | 749 | // calculate the sector that contains the current cluster within the fat |
|
| - | 750 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
|
| - | 751 | // calculate byte offset of the current cluster within that fat sector |
|
| - | 752 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
|
| - | 753 | do |
|
| 719 | u32 fat_sector_offset = 0; |
754 | { |
| 720 | 755 | if(sector != sector_in_buffer) |
|
| 721 | fat_sector_offset = ((file->cluster_pointer) - (FirstDataCluster)); // Calculate index of actual cluster in FAT. |
- | |
| 722 | fat_sector_offset /= SectorsPerCluster; |
- | |
| 723 | fat_sector_offset += 2; // In Fat16 clusterpositions have an offset of two. |
- | |
| 724 | - | ||
| 725 | return((u16)fat_sector_offset); |
756 | { |
| 726 | } |
757 | // read this sector to buffer |
| 727 | 758 | sector_in_buffer = sector; |
|
| 728 | //________________________________________________________________________________________________________________________________________ |
- | |
| Line 729... | Line 759... | ||
| 729 | // Funtion: u16 GetFatSectorIndex(File *file); |
759 | if(SD_SUCCESS != SDC_GetSector(sector_in_buffer, buffer)) return 0; // read sector from sd-card |
| Line 730... | Line 760... | ||
| 730 | // |
760 | } |
| 731 | // Description: This function returns the sectorindex of the cluster specified by file->cluster_pointer of the specified file. |
761 | // read the next cluster from cache |
| 732 | // |
762 | fat = (Fat16Entry_t *)(&(buffer[byte])); |
| 733 | //________________________________________________________________________________________________________________________________________ |
- | |
| 734 | 763 | cluster = fat->NextCluster; |
|
| 735 | u16 GetFatSectorIndex(File *file) |
764 | if((FAT16_CLUSTER_USED_MIN <= cluster) && (cluster <= FAT16_CLUSTER_USED_MAX) ) repeat = 1; |
| 736 | { |
765 | else repeat = 0; |
| 737 | u16 fat_pointer = 0; |
766 | |
| 738 | 767 | fat->NextCluster = FAT16_CLUSTER_FREE; // mark current cluster as free |
|
| Line 739... | Line -... | ||
| 739 | fat_pointer = GetFatClusterOffset(file); |
- | |
| 740 | fat_pointer = fat_pointer % 0x100; // Calculate the clusterposition in the fat |
- | |
| 741 | - | ||
| 742 | return(fat_pointer); |
- | |
| 743 | } |
- | |
| 744 | - | ||
| 745 | //________________________________________________________________________________________________________________________________________ |
768 | // calculate byte offset in the fat for corresponding entry |
| 746 | // Funtion: u16 CreateFileInDirectory(u8 *, File *) |
769 | fat_byte_offset = ((uint32_t)cluster)<<1; // two FAT bytes (16 bits) for every cluster |
| 747 | // |
- | |
| 748 | // Description: This function looks for the next free position in the directory and creates an entry. The type of an directoryentry is |
- | |
| 749 | // specified by the attribute. |
- | |
| 750 | // bit0: unused |
- | |
| 751 | // bit1: archive |
- | |
| 752 | // bit2: read_only |
- | |
| 753 | // bit3: system |
770 | // calculate the sector that contains the current cluster within the fat |
| 754 | // bit4: directory |
- | |
| 755 | // bit5: volume |
- | |
| 756 | //________________________________________________________________________________________________________________________________________ |
- | |
| 757 | - | ||
| 758 | u8 CreateFileInDirectory(s8 *fname, File *file) |
- | |
| 759 | { |
- | |
| 760 | u16 rootentry = 0; // index to an entry in the rootdirectory. |
- | |
| 761 | u16 cnt_enries_searched = 0; // count the number of rootentries which have been searched already. |
771 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
| 762 | u8 i = 0; |
772 | // calculate byte offset of the current cluster within that fat sector |
| 763 | u16 sector_offset = 0; // index to the sector of the Rootentry which is searched momentarily |
773 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
| 764 | u8 retvalue = 0; |
774 | // if new sector is not the sector in buffer or the last cluster in the chain was traced |
| 765 | u32 cluster_temp = 0; |
775 | if((sector != sector_in_buffer) || !repeat) |
| 766 | u16 cluster = 0; |
776 | { // write sector in buffer |
| 767 | s8 name[11] = " "; |
777 | if(SD_SUCCESS != SDC_PutSector(sector_in_buffer,buffer)) return 0; |
| - | 778 | } |
|
| - | 779 | } |
|
| 768 | 780 | while(repeat); |
|
| - | 781 | ||
| - | 782 | return 1; |
|
| - | 783 | } |
|
| - | 784 | ||
| - | 785 | ||
| - | 786 | /****************************************************************************************************************************************/ |
|
| 769 | SeperateFileName(fname,name); |
787 | /* Function: uint16_t AppendCluster(File *file); */ |
| 770 | 788 | /* */ |
|
| 771 | cluster_temp = (u32)FindNextFreeCluster(file); // the next free cluster on the disk. |
789 | /* Description: This function looks in the fat to find the next free cluster and appends it to the file. */ |
| Line 772... | Line 790... | ||
| 772 | 790 | /* */ |
|
| 773 | if(cluster_temp) // if a free cluster is available: |
791 | /* Returnvalue: The function returns the appened cluster number or 0 of no cluster was appended. */ |
| 774 | { |
- | |
| - | 792 | /****************************************************************************************************************************************/ |
|
| 775 | cluster = (u16)cluster_temp; // remember the index of the free datacluster found for the directory entry. |
793 | uint16_t AppendCluster(File_t *file) |
| 776 | cluster_temp -=2; // Clusterposition is ((position in FAT)-2). first two entries in FAT are reserved. |
- | |
| - | 794 | { |
|
| 777 | cluster_temp *= SectorsPerCluster; // Calculate relative sectorindex of first datacluster. |
795 | uint16_t last_cluster, new_cluster = 0; |
| 778 | file->start_cluster = (FirstDataCluster + cluster_temp); // Calculate absolute sectorposition of first datacluster. |
796 | uint32_t fat_byte_offset, sector, byte; |
| 779 | file->cluster_pointer = file->start_cluster; // start reading the file with the first sector of the first datacluster. |
- | |
| 780 | 797 | Fat16Entry_t * fat; |
|
| 781 | // directory starts at sector specified by dir_sector. This can be the rootdirectory or any other directory. |
798 | |
| 782 | do |
- | |
| 783 | { // search the next 16 rootentries in this sector of the roordirectory. |
799 | if((!Partition.IsValid) || (file == NULL)) return(new_cluster); |
| 784 | rootentry=0; |
- | |
| 785 | SDC_GetSector((u32)(CWD + sector_offset),file->buffer); // Read the Rootdirectory. |
- | |
| 786 | DirectoryEntry = (struct DirEntry *)file->buffer; |
800 | |
| 787 | while((rootentry<16) && (!retvalue)) |
- | |
| Line -... | Line 801... | ||
| - | 801 | new_cluster = FindNextFreeCluster(file); // the next free cluster found on the disk. |
|
| - | 802 | if(new_cluster) |
|
| 788 | { |
803 | { // A free cluster was found and can be added to the end of the file. |
| - | 804 | fseek_(file, 0, SEEK_END); // jump to the end of the file |
|
| Line -... | Line 805... | ||
| - | 805 | last_cluster = SectorToFat16Cluster(file->FirstSectorOfCurrCluster); // determine current file cluster |
|
| 789 | if((DirectoryEntry[rootentry].attribute == 0) || (DirectoryEntry[rootentry].attribute == 0xE5)) // empty directory entry found |
806 | fat_byte_offset = ((uint32_t)last_cluster)<<1; |
| Line 790... | Line -... | ||
| 790 | { |
- | |
| 791 | for(i=0;i<11;i++) DirectoryEntry[rootentry].name[i] = name[i]; // Kopie the filename and the file extension to the directoryentry. |
- | |
| 792 | DirectoryEntry[rootentry].attribute = _FILE; // Set the fileattribute to archive to reserve the directoryentry. |
807 | sector = Partition.FirstFatSector + ( fat_byte_offset / BYTES_PER_SECTOR); |
| 793 | DirectoryEntry[rootentry].startcluster = cluster; // copy the location of the first datacluster to the directoryentry. |
- | |
| 794 | DirectoryEntry[rootentry].size = 0; // the new createted file has no content yet. |
808 | byte = fat_byte_offset % BYTES_PER_SECTOR; |
| 795 | file->directory_sector = (u32) (CWD + sector_offset); |
809 | |
| Line -... | Line 810... | ||
| - | 810 | if(file->SectorInCache != sector) |
|
| - | 811 | { |
|
| 796 | file->directory_index = (u8) rootentry; |
812 | file->SectorInCache = sector; // update sector stored in buffer |
| - | 813 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read sector from sd-card |
|
| - | 814 | { |
|
| - | 815 | Fat16_Deinit(); |
|
| - | 816 | return(0); |
|
| - | 817 | } |
|
| - | 818 | } |
|
| - | 819 | fat = (Fat16Entry_t *)(&(file->Cache[byte])); |
|
| - | 820 | fat->NextCluster = new_cluster; // append the free cluster to the end of the file in the FAT. |
|
| - | 821 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // save the modified sector to the FAT. |
|
| - | 822 | { |
|
| - | 823 | Fat16_Deinit(); |
|
| - | 824 | return(0); |
|
| - | 825 | } |
|
| - | 826 | file->FirstSectorOfCurrCluster = Fat16ClusterToSector(new_cluster); |
|
| - | 827 | file->SectorOfCurrCluster = 0; |
|
| - | 828 | file->ByteOfCurrSector = 0; |
|
| - | 829 | } |
|
| - | 830 | return(new_cluster); |
|
| - | 831 | } |
|
| - | 832 | ||
| - | 833 | /****************************************************************************************************************************************************/ |
|
| 797 | retvalue = 1; |
834 | /* Function: DirectoryEntryExist(int8_t *, uint8_t, uint8_t, File_t *) */ |
| 798 | SDC_PutSector((u32)(CWD + sector_offset),file->buffer); |
- | |
| 799 | } |
- | |
| 800 | rootentry++; |
- | |
| 801 | cnt_enries_searched++; |
- | |
| 802 | } |
- | |
| 803 | if(!retvalue) // file not found in this sector so take next sector. |
- | |
| 804 | { |
- | |
| 805 | rootentry = 0; |
- | |
| 806 | sector_offset++; |
- | |
| 807 | } |
- | |
| 808 | } |
- | |
| 809 | while((cnt_enries_searched< PossibleRootEntries) && (!retvalue)); |
- | |
| 810 | - | ||
| 811 | } |
- | |
| 812 | return(retvalue); // return 1 if file has been created otherwise return 0. |
- | |
| 813 | } |
- | |
| 814 | - | ||
| 815 | //________________________________________________________________________________________________________________________________________ |
- | |
| 816 | // Funtion: u16 SeekFileInDirectory(s8 *fname, File *) |
- | |
| 817 | // |
835 | /* */ |
| 818 | // Description: this function searches all possible entries withint the actual directory for the specified object. |
- | |
| 819 | // |
836 | /* Description: This function searches all possible dir entries until the file or directory is found or the end of the directory is reached */ |
| 820 | // Returnvalue: This function returns 1 if the directoryentry specified was found. |
837 | /* */ |
| 821 | //________________________________________________________________________________________________________________________________________ |
838 | /* Returnvalue: This function returns 1 if the directory entry specified was found. */ |
| - | 839 | /****************************************************************************************************************************************************/ |
|
| 822 | 840 | uint8_t DirectoryEntryExist(int8_t *dirname, uint8_t attribfilter, uint8_t attribmask, File_t *file) |
|
| - | 841 | { |
|
| - | 842 | uint32_t dir_sector, max_dir_sector, curr_sector; |
|
| - | 843 | uint16_t dir_entry = 0; |
|
| 823 | u8 SeekFileInDirectory(s8 *fname, File *file) |
844 | |
| - | 845 | uint16_t end_of_directory_not_reached = 0; |
|
| - | 846 | uint8_t i = 0; |
|
| - | 847 | uint8_t direntry_exist = 0; |
|
| - | 848 | DirEntry_t * dir; |
|
| - | 849 | ||
| - | 850 | // if incomming pointers are useless return immediatly |
|
| - | 851 | if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return(direntry_exist); |
|
| - | 852 | ||
| 824 | { |
853 | // dir entries can be searched only in filesclusters that have |
| - | 854 | // a corresponding dir entry with adir-flag set in its attribute |
|
| 825 | u16 rootentry=0; |
855 | // or direct within the root directory area |
| 826 | u16 end_of_directory_not_reached = 0; // the directory has been read completely without a result. |
- | |
| 827 | u8 i=0; |
- | |
| 828 | u8 retvalue = 0; |
- | |
| 829 | u32 cluster_temp = 0; |
- | |
| Line -... | Line 856... | ||
| - | 856 | ||
| - | 857 | file->FirstSectorOfFirstCluster = 0; |
|
| - | 858 | // no current directory exist therefore assume searching in the root |
|
| - | 859 | if(file->DirectorySector == 0) |
|
| Line 830... | Line -... | ||
| 830 | s8 name[11] = " "; |
- | |
| 831 | - | ||
| 832 | SeperateFileName(fname,name); |
- | |
| 833 | - | ||
| 834 | file->cluster_pointer = CWD; // start looking for the file in the actual directory. |
- | |
| 835 | - | ||
| 836 | // directory starts at sector specified by dir_sector. This can be the rootdirectory or any other directory. |
- | |
| 837 | do |
860 | { |
| 838 | { // search the next 16 rootentries in this sector of the roordirectory. |
861 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
| 839 | rootentry=0; |
- | |
| 840 | SDC_GetSector((u32) file->cluster_pointer,file->buffer); // Read the Rootdirectory. |
- | |
| 841 | DirectoryEntry = (struct DirEntry *)file->buffer; |
- | |
| 842 | - | ||
| 843 | while((!retvalue)&&(rootentry<16)) |
- | |
| 844 | { |
- | |
| 845 | i=0; |
- | |
| 846 | if(DirectoryEntry[rootentry].name[0] != 0xe5) // ignore deleted items. |
862 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
| 847 | { |
863 | } |
| 848 | while((i<=10)&&(DirectoryEntry[rootentry].name[i] == name[i])) |
864 | // within the root directory area we can read sectors sequentially until the end of this area |
| 849 | { |
865 | else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
| 850 | i++; |
- | |
| 851 | } |
866 | { |
| 852 | } |
- | |
| 853 | 867 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
|
| 854 | if((i==11) && (DirectoryEntry[rootentry].attribute & _FILE)) // entry found!! -> reading startcluster of entry from offset 26. |
- | |
| 855 | { |
- | |
| 856 | cluster_temp = (u32)DirectoryEntry[rootentry].startcluster; |
868 | } |
| - | 869 | // within the data clusters we can read sectors sequentially only within the cluster |
|
| - | 870 | else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
|
| - | 871 | { |
|
| - | 872 | max_dir_sector = Partition.SectorsPerCluster; // limit max secters before next cluster |
|
| - | 873 | } |
|
| - | 874 | else return (direntry_exist); // bad sector range for directory sector of the file |
|
| - | 875 | // if search area is not defined yet |
|
| 857 | cluster_temp -=2; // Clusterposition is ((position in FAT)-2). first two entries in FAT are reserved. |
876 | if(file->FirstSectorOfFirstCluster == 0) |
| 858 | cluster_temp *= (u32)SectorsPerCluster; // Calculate positon of first cluster. |
877 | { |
| - | 878 | // check if the directory entry of current file is existent and has the dir-flag set |
|
| - | 879 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
|
| 859 | file->start_cluster = (FirstDataCluster + cluster_temp); |
880 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
| 860 | file->directory_sector = (u32) file->cluster_pointer; |
881 | { |
| - | 882 | Fat16_Deinit(); |
|
| - | 883 | return(direntry_exist); |
|
| - | 884 | } |
|
| - | 885 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
|
| 861 | file->cluster_pointer = file->start_cluster; // start reading the file with the first cluster. |
886 | switch((uint8_t)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
| - | 887 | { |
|
| - | 888 | case SLOT_EMPTY: |
|
| - | 889 | case SLOT_DELETED: |
|
| - | 890 | // the directrory pointer of this file points to a deleted or not existen directory |
|
| - | 891 | // therefore no file or subdirectory can be created |
|
| - | 892 | return (direntry_exist); |
|
| - | 893 | break; |
|
| - | 894 | default: // and is a real directory |
|
| - | 895 | if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
|
| - | 896 | { // current file is not a directory therefore no file or subdirectory can be created here |
|
| - | 897 | return (direntry_exist); |
|
| - | 898 | } |
|
| - | 899 | break; |
|
| - | 900 | } |
|
| 862 | file->filesize = (u32) DirectoryEntry[rootentry].size; |
901 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[file->DirectoryIndex].StartCluster); |
| - | 902 | } |
|
| - | 903 | ||
| - | 904 | // update current file data area position to start of first cluster |
|
| - | 905 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
|
| - | 906 | file->SectorOfCurrCluster = 0; |
|
| - | 907 | file->ByteOfCurrSector = 0; |
|
| - | 908 | ||
| - | 909 | do // loop over all data clusters of the current directory entry |
|
| - | 910 | { |
|
| - | 911 | dir_sector = 0; // reset sector counter within a new cluster |
|
| - | 912 | do // loop over all sectors of a cluster or all sectors of the root directory |
|
| - | 913 | { |
|
| - | 914 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
|
| - | 915 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
|
| - | 916 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read the sector |
|
| - | 917 | { |
|
| - | 918 | Fat16_Deinit(); |
|
| - | 919 | return(direntry_exist); |
|
| - | 920 | } |
|
| - | 921 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
|
| - | 922 | // search all directory entries within that sector |
|
| - | 923 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
|
| - | 924 | { // check for existing dir entry |
|
| - | 925 | switch((uint8_t)dir[dir_entry].Name[0]) |
|
| - | 926 | { |
|
| - | 927 | case SLOT_EMPTY: |
|
| - | 928 | case SLOT_DELETED: |
|
| - | 929 | // ignore empty or deleted dir entries |
|
| - | 930 | break; |
|
| - | 931 | default: |
|
| - | 932 | // if existing check attributes before names are compared will safe performance |
|
| - | 933 | if ((dir[dir_entry].Attribute & attribmask) != attribfilter) break; // attribute must match |
|
| - | 934 | // then compare the name to the giveb dirname (first 11 characters include 8 chars of basename and 3 chars extension.) |
|
| - | 935 | i = 0; |
|
| - | 936 | while((i < 11) && (dir[dir_entry].Name[i] == dirname[i])) i++; |
|
| - | 937 | if (i < 10) break; // names does not match |
|
| - | 938 | // if dirname and attribute have matched |
|
| - | 939 | file->Attribute = dir[dir_entry].Attribute; // store attribute of found dir entry |
|
| - | 940 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dir[dir_entry].StartCluster); // set sector of first data cluster |
|
| - | 941 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
|
| - | 942 | file->SectorOfCurrCluster = 0; |
|
| - | 943 | file->ByteOfCurrSector = 0; |
|
| - | 944 | file->DirectorySector = curr_sector; // current sector |
|
| - | 945 | file->DirectoryIndex = dir_entry; // current direntry in current sector |
|
| - | 946 | file->Size = dir[dir_entry].Size; |
|
| - | 947 | direntry_exist = 1; // mark as found |
|
| - | 948 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
|
| - | 949 | } // end of first byte of name check |
|
| - | 950 | } |
|
| - | 951 | dir_sector++; // search next sector |
|
| - | 952 | // stop if we reached the end of the cluster or the end of the root dir |
|
| - | 953 | }while((dir_sector < max_dir_sector) && (!direntry_exist)); |
|
| - | 954 | ||
| - | 955 | // if we are seaching in the data area and the file not found in this cluster so take next cluster. |
|
| - | 956 | if(!direntry_exist && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
|
| - | 957 | { |
|
| - | 958 | end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
|
| - | 959 | } |
|
| - | 960 | }while((end_of_directory_not_reached) && (!direntry_exist)); // repeat until a next cluster exist an no |
|
| - | 961 | return(direntry_exist); |
|
| - | 962 | } |
|
| - | 963 | ||
| - | 964 | ||
| - | 965 | /****************************************************************************************************************************************/ |
|
| - | 966 | /* Function: CreateDirectoryEntry(int8_t *, uint16_t, File_t *) */ |
|
| - | 967 | /* */ |
|
| - | 968 | /* Description: This function looks for the next free position in the directory and creates an entry. */ |
|
| - | 969 | /* The type of an directory entry is specified by the file attribute. */ |
|
| - | 970 | /* */ |
|
| - | 971 | /* Returnvalue: Return 0 on error */ |
|
| - | 972 | /****************************************************************************************************************************************/ |
|
| - | 973 | uint8_t CreateDirectoryEntry(int8_t *dirname, uint8_t attrib, File_t *file) |
|
| - | 974 | { |
|
| - | 975 | uint32_t dir_sector, max_dir_sector, curr_sector; |
|
| - | 976 | uint16_t dir_entry = 0; |
|
| - | 977 | uint16_t subdircluster, dircluster = 0; |
|
| - | 978 | uint16_t end_of_directory_not_reached = 0; |
|
| - | 979 | uint8_t i = 0; |
|
| 863 | file->directory_index = (u8) rootentry; |
980 | uint8_t retvalue = 0; |
| 864 | retvalue = 1; |
981 | DirEntry_t* dir; |
| 865 | } |
- | |
| 866 | rootentry++; |
- | |
| 867 | } |
982 | |
| - | 983 | if((!Partition.IsValid) || (file == NULL) || (dirname == NULL)) return (retvalue); |
|
| - | 984 | // It is not checked here that the dir entry that should be created is already existent! |
|
| - | 985 | ||
| - | 986 | // Dir entries can be created only in file-clusters that have |
|
| 868 | if(!retvalue) // file not found in this sector so take next sector. |
987 | // the dir-flag set in its attribute or within the root directory |
| - | 988 | ||
| - | 989 | file->FirstSectorOfFirstCluster = 0; |
|
| - | 990 | // no current directory exist therefore assume creating in the root |
|
| - | 991 | if(file->DirectorySector == 0) |
|
| - | 992 | { |
|
| 869 | { |
993 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
| 870 | end_of_directory_not_reached = GetNextCluster(file); |
994 | dircluster = 0; |
| - | 995 | file->FirstSectorOfFirstCluster = Partition.FirstRootDirSector; |
|
| 871 | } |
996 | } |
| - | 997 | // within the root directory area we can read sectors sequentially until the end of this area |
|
| - | 998 | else if((Partition.FirstRootDirSector <= file->DirectorySector) && (file->DirectorySector < Partition.FirstDataSector)) |
|
| - | 999 | { |
|
| - | 1000 | max_dir_sector = (Partition.MaxRootEntries * DIRENTRY_SIZE)/BYTES_PER_SECTOR; |
|
| - | 1001 | } |
|
| 872 | } |
1002 | // within the data clusters we can read sectors sequentially only within the cluster |
| - | 1003 | else if((Partition.FirstDataSector <= file->DirectorySector) && (file->DirectorySector <= Partition.LastDataSector)) |
|
| - | 1004 | { |
|
| - | 1005 | max_dir_sector = Partition.SectorsPerCluster; |
|
| - | 1006 | } |
|
| - | 1007 | else return (retvalue); // bad sector range for directory sector of the file |
|
| - | 1008 | // if search area is not defined yet |
|
| - | 1009 | if(file->FirstSectorOfFirstCluster == 0) |
|
| - | 1010 | { |
|
| - | 1011 | // check if the directory entry of current file is existent and has the dir-flag set |
|
| - | 1012 | file->SectorInCache = file->DirectorySector; // update the sector number of file cache. |
|
| - | 1013 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
|
| - | 1014 | { |
|
| - | 1015 | Fat16_Deinit(); |
|
| - | 1016 | return(retvalue); |
|
| - | 1017 | } |
|
| - | 1018 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
|
| - | 1019 | switch((uint8_t)dir[file->DirectoryIndex].Name[0]) // check if current directory exist |
|
| - | 1020 | { |
|
| - | 1021 | case SLOT_EMPTY: |
|
| - | 1022 | case SLOT_DELETED: |
|
| - | 1023 | return (retvalue); |
|
| - | 1024 | break; |
|
| - | 1025 | default: // and is a real directory |
|
| - | 1026 | if((dir[file->DirectoryIndex].Attribute & ATTR_SUBDIRECTORY) != ATTR_SUBDIRECTORY) |
|
| - | 1027 | { // current file is not a directory therefore no file or subdirectory can be created here |
|
| - | 1028 | return (retvalue); |
|
| - | 1029 | } |
|
| - | 1030 | break; |
|
| - | 1031 | } |
|
| - | 1032 | dircluster = dir[file->DirectoryIndex].StartCluster; |
|
| - | 1033 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(dircluster); |
|
| - | 1034 | } |
|
| - | 1035 | ||
| - | 1036 | subdircluster = FindNextFreeCluster(file); // get the next free cluster on the disk and mark it as used. |
|
| - | 1037 | if(subdircluster) |
|
| - | 1038 | { |
|
| - | 1039 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
|
| - | 1040 | file->SectorOfCurrCluster = 0; |
|
| - | 1041 | do // loop over all clusters of current directory |
|
| - | 1042 | { |
|
| - | 1043 | dir_sector = 0; // reset sector counter within a new cluster |
|
| - | 1044 | do // loop over all sectors of a cluster or all sectors of the root directory |
|
| - | 1045 | { |
|
| - | 1046 | curr_sector = file->FirstSectorOfCurrCluster + dir_sector; // calculate sector number |
|
| - | 1047 | file->SectorInCache = curr_sector; // upate the sector number of file cache. |
|
| - | 1048 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
|
| - | 1049 | { |
|
| - | 1050 | Fat16_Deinit(); |
|
| - | 1051 | return(retvalue); |
|
| - | 1052 | } |
|
| - | 1053 | dir = (DirEntry_t *)file->Cache; // set pointer to directory |
|
| - | 1054 | // search all directory entries of a sector |
|
| - | 1055 | for(dir_entry = 0; dir_entry < DIRENTRIES_PER_SECTOR; dir_entry++) |
|
| - | 1056 | { // check if current direntry is available |
|
| - | 1057 | if(((uint8_t)dir[dir_entry].Name[0] == SLOT_EMPTY) || ((uint8_t)dir[dir_entry].Name[0] == SLOT_DELETED)) |
|
| - | 1058 | { // a free direntry was found |
|
| 873 | while((end_of_directory_not_reached) && (!retvalue)); |
1059 | for(i = 0; i < 11; i++) dir[dir_entry].Name[i] = dirname[i]; // Set dir name |
| - | 1060 | dir[dir_entry].Attribute = attrib; // Set the attribute of the new directoryentry. |
|
| - | 1061 | dir[dir_entry].StartCluster = subdircluster; // copy the location of the first datacluster to the directoryentry. |
|
| - | 1062 | dir[dir_entry].DateTime = FileDateTime(&SystemTime); // set date/time |
|
| - | 1063 | dir[dir_entry].Size = 0; // the new createted file has no content yet. |
|
| - | 1064 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to card |
|
| - | 1065 | { |
|
| - | 1066 | Fat16_Deinit(); |
|
| - | 1067 | return(retvalue); |
|
| - | 1068 | } |
|
| - | 1069 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(subdircluster); // Calculate absolute sectorposition of first datacluster. |
|
| - | 1070 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; // Start reading the file with the first sector of the first datacluster. |
|
| - | 1071 | file->SectorOfCurrCluster = 0; // reset sector of cureen cluster |
|
| - | 1072 | file->ByteOfCurrSector = 0; // reset the byte location within the current sector |
|
| - | 1073 | file->Attribute = attrib; // set file attribute to dir attribute |
|
| - | 1074 | file->Size = 0; // new file has no size |
|
| - | 1075 | file->DirectorySector = curr_sector; |
|
| - | 1076 | file->DirectoryIndex = dir_entry; |
|
| - | 1077 | if((attrib & ATTR_SUBDIRECTORY) == ATTR_SUBDIRECTORY) // if a new directory was created then initilize the data area |
|
| - | 1078 | { |
|
| - | 1079 | ClearCurrCluster(file); // fill cluster with zeros |
|
| - | 1080 | file->SectorInCache = file->FirstSectorOfFirstCluster; |
|
| - | 1081 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache))// read in the sector. |
|
| - | 1082 | { |
|
| - | 1083 | Fat16_Deinit(); |
|
| - | 1084 | return(retvalue); |
|
| - | 1085 | } |
|
| - | 1086 | dir = (DirEntry_t *)file->Cache; |
|
| - | 1087 | // create direntry "." to current dir |
|
| - | 1088 | dir[0].Name[0] = 0x2E; |
|
| - | 1089 | for(i = 1; i < 11; i++) dir[0].Name[i] = ' '; |
|
| - | 1090 | dir[0].Attribute = ATTR_SUBDIRECTORY; |
|
| - | 1091 | dir[0].StartCluster = subdircluster; |
|
| - | 1092 | dir[0].DateTime = 0; |
|
| - | 1093 | dir[0].Size = 0; |
|
| - | 1094 | // create direntry ".." to the upper dir |
|
| - | 1095 | dir[1].Name[0] = 0x2E; |
|
| - | 1096 | dir[1].Name[1] = 0x2E; |
|
| - | 1097 | for(i = 2; i < 11; i++) dir[1].Name[i] = ' '; |
|
| - | 1098 | dir[1].Attribute = ATTR_SUBDIRECTORY; |
|
| - | 1099 | dir[1].StartCluster = dircluster; |
|
| - | 1100 | dir[1].DateTime = 0; |
|
| - | 1101 | dir[1].Size = 0; |
|
| - | 1102 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// read in the sector. |
|
| - | 1103 | { |
|
| - | 1104 | Fat16_Deinit(); |
|
| - | 1105 | return(retvalue); |
|
| - | 1106 | } |
|
| - | 1107 | } |
|
| - | 1108 | retvalue = 1; |
|
| - | 1109 | dir_entry = DIRENTRIES_PER_SECTOR; // stop for-loop |
|
| - | 1110 | } |
|
| - | 1111 | } |
|
| - | 1112 | dir_sector++; // search next sector |
|
| - | 1113 | // stop if we reached the end of the cluster or the end of the root dir |
|
| 874 | return(retvalue); |
1114 | }while((dir_sector < max_dir_sector) && (!retvalue)); |
| 875 | } |
1115 | |
| 876 | 1116 | // if we are seaching in the data area and the file not found in this cluster so take next cluster. |
|
| - | 1117 | if(!retvalue && ( Partition.FirstDataSector <= file->FirstSectorOfCurrCluster)) |
|
| 877 | 1118 | { |
|
| 878 | 1119 | end_of_directory_not_reached = GetNextCluster(file); // updates File->FirstSectorOfCurrCluster |
|
| 879 | //________________________________________________________________________________________________________________________________________ |
- | |
| 880 | // Funtion: void SeperateFileName(u8*); |
- | |
| 881 | // |
- | |
| 882 | // Description: This function seperates the filename and the fileattribute and brings them into the needed format ('test.txt' -> 'TEST TXT'); |
- | |
| 883 | // |
1120 | } |
| 884 | //________________________________________________________________________________________________________________________________________ |
1121 | }while((end_of_directory_not_reached) && (!retvalue)); |
| 885 | 1122 | // Perhaps we are at the end of the last cluster of a directory file an have no free direntry found. |
|
| 886 | void SeperateFileName(s8 *fname, s8 *name) |
1123 | // Then we would need to add a cluster to that file and create the new direntry there. |
| 887 | { |
1124 | // This code is not implemented yet, because its occurs only if more that 32*32=1024 direntries are |
| 888 | u8 readpointer = 0; |
1125 | // within a subdirectory of root. |
| 889 | u8 writepointer = 0; |
1126 | } |
| - | 1127 | return(retvalue); // return 1 if file has been created otherwise return 0. |
|
| - | 1128 | } |
|
| - | 1129 | ||
| 890 | u8 attribute = 1; |
1130 | /********************************************************************************************************************************************/ |
| 891 | u8 i = 0; |
- | |
| 892 | - | ||
| 893 | - | ||
| 894 | while((writepointer<=10) && (fname[readpointer]!=0)) // the rootdirectoryentry is 8bytes for filename and 3bytes for fileattribute. |
1131 | /* Function: FileExist(const int8_t* filename, uint8_t attribfilter, uint8_t attribmask, File_t *file); */ |
| - | 1132 | /* */ |
|
| - | 1133 | /* Description: This function looks for the specified file including its subdirectories beginning */ |
|
| - | 1134 | /* in the rootdirectory of the drive. If the file is found the Filepointer properties are */ |
|
| - | 1135 | /* updated. */ |
|
| - | 1136 | /* */ |
|
| - | 1137 | /* Returnvalue: 1 if file is found else 0. */ |
|
| 895 | { // the filename in the rootdirectory is in the format "TEST TXT" without the dot. |
1138 | /********************************************************************************************************************************************/ |
| - | 1139 | uint8_t FileExist(const int8_t* filename, const uint8_t attribfilter, const uint8_t attribmask, File_t *file) |
|
| 896 | if(fname[readpointer]=='.') // seperating filename and attribute. |
1140 | { |
| Line 897... | Line -... | ||
| 897 | { |
- | |
| 898 | if(attribute) // is the filename "." or ".." ? |
- | |
| 899 | { |
- | |
| 900 | name[writepointer] = fname[readpointer]; |
- | |
| 901 | readpointer++; |
- | |
| 902 | writepointer++; |
- | |
| 903 | } |
- | |
| 904 | else |
- | |
| 905 | { |
- | |
| 906 | if(fname[(readpointer-1)] != '*') |
- | |
| 907 | { |
- | |
| 908 | for(i=writepointer;i<8;i++) |
- | |
| 909 | { |
- | |
| 910 | name[i] = ' '; |
- | |
| 911 | } |
- | |
| Line -... | Line 1141... | ||
| - | 1141 | int8_t* path = 0; |
|
| - | 1142 | int8_t* subpath = 0; |
|
| - | 1143 | uint8_t af, am, file_exist = 0; |
|
| - | 1144 | int8_t dirname[12]; // 8+3 + temination character |
|
| - | 1145 | ||
| - | 1146 | // if incomming pointers are useless return immediatly |
|
| - | 1147 | if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
|
| - | 1148 | ||
| - | 1149 | // trace along the filepath |
|
| - | 1150 | path = (int8_t*)filename; // start a the beginning of the filename string |
|
| - | 1151 | file->DirectorySector = 0; // start at RootDirectory with file search |
|
| - | 1152 | file->DirectoryIndex = 0; |
|
| - | 1153 | // as long as the file was not found and the remaining path is not empty |
|
| - | 1154 | while((*path != 0) && !file_exist) |
|
| - | 1155 | { // separate dirname and subpath from filepath string |
|
| - | 1156 | subpath = SeperateDirName(path, dirname); |
|
| - | 1157 | if(subpath != NULL) |
|
| - | 1158 | { |
|
| - | 1159 | if(*subpath == 0) |
|
| - | 1160 | { // empty subpath indicates last element of dir chain |
|
| - | 1161 | af = attribfilter; |
|
| - | 1162 | am = attribmask; |
|
| - | 1163 | } |
|
| - | 1164 | else // it must be a subdirectory and no volume label |
|
| - | 1165 | { |
|
| - | 1166 | af = ATTR_SUBDIRECTORY; |
|
| 912 | } |
1167 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
| - | 1168 | } |
|
| 913 | readpointer++; |
1169 | if(!DirectoryEntryExist(dirname, af, am, file)) |
| - | 1170 | { |
|
| - | 1171 | return (file_exist); // subdirectory does not exist |
|
| - | 1172 | } |
|
| - | 1173 | else |
|
| - | 1174 | { |
|
| - | 1175 | if (*subpath == 0) |
|
| - | 1176 | { |
|
| - | 1177 | file_exist = 1; // last element of path chain was found with the given attribute filter |
|
| - | 1178 | } |
|
| - | 1179 | } |
|
| 914 | writepointer = 8; |
1180 | } |
| - | 1181 | else // error seperating the subpath |
|
| - | 1182 | { |
|
| - | 1183 | return file_exist; // bad subdir format |
|
| - | 1184 | } |
|
| - | 1185 | path = subpath; |
|
| - | 1186 | subpath = 0; |
|
| - | 1187 | } |
|
| - | 1188 | return (file_exist); |
|
| - | 1189 | } |
|
| - | 1190 | ||
| 915 | } |
1191 | |
| 916 | } |
- | |
| 917 | else if(fname[readpointer] == '*') // wildcard found within the filename + extension. |
1192 | /********************************************************************************************************************************************/ |
| 918 | { |
- | |
| 919 | if(writepointer < 8) // in extension. |
- | |
| 920 | { |
- | |
| 921 | readpointer++; |
- | |
| 922 | writepointer = 8; |
- | |
| 923 | } |
- | |
| 924 | else // in filename. |
- | |
| 925 | { |
- | |
| 926 | writepointer = 11; // jump to the end of the string to terminate this function. |
- | |
| 927 | } |
- | |
| 928 | attribute = 0; |
- | |
| 929 | } |
- | |
| 930 | else |
1193 | /* Function: FileCreate(const s8* filename, u8 attrib, File_t *file); */ |
| - | 1194 | /* */ |
|
| - | 1195 | /* Description: This function looks for the specified file including its subdirectories beginning */ |
|
| 931 | { |
1196 | /* in the rootdirectory of the partition. If the file is found the Filepointer properties are */ |
| 932 | if((fname[readpointer]>96) && (fname[readpointer]<123)) |
1197 | /* updated. If file or its subdirectories are not found they will be created */ |
| 933 | { |
1198 | /* */ |
| Line -... | Line 1199... | ||
| - | 1199 | /* Returnvalue: 1 if file was created else 0. */ |
|
| - | 1200 | /********************************************************************************************************************************************/ |
|
| - | 1201 | uint8_t FileCreate(const int8_t* filename, const uint8_t attrib, File_t *file) |
|
| 934 | name[writepointer]=(fname[readpointer] - 32); // all characters must be upper case. |
1202 | { |
| - | 1203 | int8_t *path = 0; |
|
| - | 1204 | int8_t *subpath = 0; |
|
| - | 1205 | uint8_t af, am, file_created = 0; |
|
| - | 1206 | int8_t dirname[12]; |
|
| 935 | } |
1207 | |
| 936 | else |
1208 | // if incomming pointers are useless return immediatly |
| 937 | { |
1209 | if ((filename == NULL) || (file == NULL) || (!Partition.IsValid)) return 0; |
| 938 | name[writepointer]=fname[readpointer]; |
1210 | |
| - | 1211 | // trace along the filepath |
|
| 939 | } |
1212 | path = (int8_t*)filename; // start a the beginning of the filename string |
| - | 1213 | file->DirectorySector = 0; // start at RootDirectory with file search |
|
| 940 | readpointer++; |
1214 | file->DirectoryIndex = 0; |
| - | 1215 | // as long as the file was not created and the remaining file path is not empty |
|
| - | 1216 | while((*path != 0) && !file_created) |
|
| 941 | writepointer++; |
1217 | { // separate dirname and subpath from filepath string |
| - | 1218 | subpath = SeperateDirName(path, dirname); |
|
| - | 1219 | if(subpath != NULL) |
|
| - | 1220 | { |
|
| - | 1221 | if(*subpath == 0) |
|
| - | 1222 | { // empty subpath indicates last element of dir chain |
|
| 942 | attribute = 0; |
1223 | af = ATTR_NONE; |
| - | 1224 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; // any file that is no subdir or volume label |
|
| - | 1225 | } |
|
| - | 1226 | else // it must be a subdirectory and no volume label |
|
| - | 1227 | { |
|
| - | 1228 | af = ATTR_SUBDIRECTORY; |
|
| - | 1229 | am = ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL; |
|
| - | 1230 | } |
|
| 943 | } |
1231 | if(!DirectoryEntryExist(dirname, af, am, file)) // if subdir or file is not existent |
| - | 1232 | { // try to create subdir or file |
|
| - | 1233 | if(*subpath == 0) af = attrib; // if last element in dir chain take the given attribute |
|
| - | 1234 | if(!CreateDirectoryEntry(dirname, af, file)) |
|
| 944 | } |
1235 | { // could not be created |
| 945 | } |
1236 | return(file_created); |
| - | 1237 | } |
|
| - | 1238 | else if (*subpath == 0) file_created = 1; // last element of path chain was created |
|
| - | 1239 | } |
|
| - | 1240 | } |
|
| - | 1241 | else // error seperating the subpath |
|
| - | 1242 | { |
|
| - | 1243 | return file_created; // bad subdir format |
|
| - | 1244 | } |
|
| - | 1245 | path = subpath; |
|
| - | 1246 | subpath = 0; |
|
| - | 1247 | } |
|
| - | 1248 | return (file_created); |
|
| - | 1249 | } |
|
| - | 1250 | ||
| - | 1251 | ||
| - | 1252 | /********************************************************************************************************************************************/ |
|
| - | 1253 | /* Function: File_t * fopen_(int8_t* filename, int8_t mode); */ |
|
| - | 1254 | /* */ |
|
| - | 1255 | /* Description: This function looks for the specified file in the rootdirectory of the drive. If the file is found the number of the */ |
|
| - | 1256 | /* corrosponding filepointer is returned. Only modes 'r' (reading) and 'a' append are implemented yet. */ |
|
| - | 1257 | /* */ |
|
| - | 1258 | /* Returnvalue: The filepointer to the file or 0 if faild. */ |
|
| - | 1259 | /********************************************************************************************************************************************/ |
|
| - | 1260 | File_t * fopen_(const int8_t *filename, const int8_t mode) |
|
| - | 1261 | { |
|
| - | 1262 | File_t *file = 0; |
|
| - | 1263 | ||
| - | 1264 | if((!Partition.IsValid) || (filename == 0)) return(file); |
|
| - | 1265 | ||
| - | 1266 | // Look for an unused filepointer in the file pointer list? |
|
| - | 1267 | file = LockFilePointer(); |
|
| - | 1268 | // if no unused file pointer was found return 0 |
|
| - | 1269 | if(file == NULL) return(file); |
|
| - | 1270 | ||
| - | 1271 | // now we have found a free filepointer and claimed it |
|
| - | 1272 | // so let initiate its property values |
|
| - | 1273 | file->FirstSectorOfFirstCluster = 0; // Sectorpointer to the first sector of the first datacluster of the file. |
|
| 946 | 1274 | file->FirstSectorOfCurrCluster = 0; // Pointer to the cluster which is edited at the moment. |
|
| - | 1275 | file->SectorOfCurrCluster = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
|
| - | 1276 | file->ByteOfCurrSector = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
|
| - | 1277 | file->Mode = mode; // mode of fileoperation (read,write) |
|
| 947 | //________________________________________________________________________________________________________________________________________ |
1278 | file->Size = 0; // the size of the opened file in bytes. |
| 948 | // Funtion: File * ReserveFilePointer_(void); |
1279 | file->Position = 0; // pointer to a byte within the file 0 < fileposition < filesize |
| 949 | // |
1280 | file->SectorInCache = 0; // the last sector read, wich is still in the sectorbuffer. |
| 950 | // Description: This function looks for a free filepointer and reserves it. |
1281 | file->DirectorySector = 0; // the sectorposition where the directoryentry has been made. |
| 951 | // |
1282 | file->DirectoryIndex = 0; // the index to the directoryentry within the specified sector. |
| - | 1283 | file->Attribute = 0; // the attribute of the file opened. |
|
| 952 | // |
1284 | |
| - | 1285 | // check if a real file (no directory) to the given filename exist |
|
| - | 1286 | if(FileExist(filename, ATTR_NONE, ATTR_SUBDIRECTORY|ATTR_VOLUMELABEL, file)) |
|
| - | 1287 | { // file exist |
|
| - | 1288 | switch(mode) // check mode |
|
| - | 1289 | { |
|
| - | 1290 | case 'a': // if mode is: append to file |
|
| - | 1291 | if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
|
| - | 1292 | { // file is marked as readonly --> do not open this file |
|
| - | 1293 | fclose_(file); |
|
| - | 1294 | file = NULL; |
|
| - | 1295 | } |
|
| - | 1296 | else |
|
| 953 | // Return: NULL = faild to reserve a filepointer |
1297 | { // file is not marked as read only --> goto end of file |
| - | 1298 | fseek_(file, 0, SEEK_END); // point to the end of the file |
|
| 954 | // otherwise filepointer |
1299 | } |
| - | 1300 | break; |
|
| - | 1301 | case 'w': // if mode is: write to file |
|
| - | 1302 | if((file->Attribute & ATTR_READONLY) == ATTR_READONLY) |
|
| - | 1303 | { // file is marked as readonly --> do not open this file |
|
| 955 | //________________________________________________________________________________________________________________________________________ |
1304 | fclose_(file); |
| Line -... | Line 1305... | ||
| - | 1305 | file = NULL; |
|
| - | 1306 | } |
|
| - | 1307 | else |
|
| - | 1308 | { // file is not marked as read only --> goto start of file |
|
| - | 1309 | // free all clusters of that file |
|
| - | 1310 | DeleteClusterChain(SectorToFat16Cluster(file->FirstSectorOfFirstCluster)); |
|
| - | 1311 | // mar an empy cluster as the last one and store the corresponding sector |
|
| - | 1312 | file->FirstSectorOfFirstCluster = Fat16ClusterToSector(FindNextFreeCluster(file)); |
|
| - | 1313 | file->FirstSectorOfCurrCluster = file->FirstSectorOfFirstCluster; |
|
| - | 1314 | file->SectorOfCurrCluster = 0; |
|
| - | 1315 | file->ByteOfCurrSector = 0; |
|
| - | 1316 | file->Size = 0; |
|
| - | 1317 | file->Position = 0; |
|
| - | 1318 | fseek_(file, 0, SEEK_SET); |
|
| - | 1319 | } |
|
| - | 1320 | break; |
|
| - | 1321 | case 'r': // if mode is: read from file |
|
| - | 1322 | // goto end of file |
|
| - | 1323 | fseek_(file, 0, SEEK_SET); |
|
| - | 1324 | break; |
|
| - | 1325 | default: // other modes are not supported |
|
| - | 1326 | fclose_(file); |
|
| - | 1327 | file = NULL; |
|
| - | 1328 | break; |
|
| - | 1329 | } |
|
| - | 1330 | return(file); |
|
| - | 1331 | } |
|
| - | 1332 | else // file does not exist |
|
| - | 1333 | { |
|
| - | 1334 | switch(mode) // check mode |
|
| - | 1335 | { |
|
| Line 956... | Line -... | ||
| 956 | - | ||
| 957 | File * ReserveFilePointer(void) |
1336 | case 'a': |
| 958 | { |
- | |
| 959 | File *file; |
1337 | case 'w': // if mode is write or append |
| 960 | file = NULL; |
- | |
| 961 | u8 temp; |
- | |
| 962 | 1338 | // try to create the file |
|
| 963 | for(temp = 0;temp<__MAX_FILES_USED;temp++) |
1339 | if(!FileCreate(filename, ATTR_ARCHIVE, file)) |
| 964 | { |
1340 | { // if it could not be created |
| 965 | if(FilePointer[temp].state == _UNUSED) // free filepointer found? |
1341 | fclose_(file); |
| - | 1342 | file = NULL; |
|
| 966 | { |
1343 | } |
| 967 | file = &FilePointer[temp]; |
1344 | break; |
| 968 | FilePointer[temp].state = _USED; // mark as used. |
1345 | case 'r': // else opened for 'r' |
| 969 | FilePointer[temp].mode = 0; // type of access (read/write) not defined yet. |
1346 | default: // of unsupported mode |
| 970 | FilePointer[temp].start_cluster = 0; // Sectorpointer to the first sector of the first datacluster of the file. |
- | |
| 971 | FilePointer[temp].cluster_pointer = 0; // Pointer to the cluster which is edited at the moment. |
1347 | fclose_(file); |
| - | 1348 | file = NULL; |
|
| Line 972... | Line -... | ||
| 972 | FilePointer[temp].sector_index = 0; // The sector which is edited at the moment (cluster_pointer + sector_index). |
- | |
| 973 | FilePointer[temp].byte_index = 0; // The bytelocation within the current sector (cluster_pointer + sector_index + byte_index). |
- | |
| - | 1349 | break; |
|
| 974 | FilePointer[temp].filesize = 0; // the size of the opend file in bytes. |
1350 | } |
| 975 | FilePointer[temp].fileposition = 0; // pointer to a character within the file 0 < fileposition < filesize |
1351 | return(file); |
| Line -... | Line 1352... | ||
| - | 1352 | } |
|
| - | 1353 | // we should never come to this point |
|
| - | 1354 | fclose_(file); |
|
| - | 1355 | file = NULL; |
|
| - | 1356 | return(file); |
|
| - | 1357 | } |
|
| - | 1358 | ||
| - | 1359 | /****************************************************************************************************************************************************/ |
|
| - | 1360 | /* Function: fflush_(File *); */ |
|
| - | 1361 | /* */ |
|
| - | 1362 | /* Description: This function writes the data already in the buffer but not yet written to the file. */ |
|
| Line -... | Line 1363... | ||
| - | 1363 | /* */ |
|
| - | 1364 | /* Returnvalue: 0 on success EOF on error */ |
|
| - | 1365 | /****************************************************************************************************************************************************/ |
|
| - | 1366 | int16_t fflush_(File_t *file) |
|
| - | 1367 | { |
|
| Line 976... | Line -... | ||
| 976 | FilePointer[temp].sector_in_buffer = 0; // the last sector read, wich is still in the sectorbuffer. |
- | |
| 977 | FilePointer[temp].directory_sector = 0; // the sectorposition where the directoryentry has been made. |
1368 | DirEntry_t *dir; |
| - | 1369 | ||
| 978 | FilePointer[temp].directory_index = 0; // the index to the directoryentry within the specified sector. |
1370 | if((file == NULL) || (!Partition.IsValid)) return (EOF); |
| 979 | FilePointer[temp].attribute = 0; // the attribute of the file opened. |
- | |
| 980 | break; |
1371 | |
| 981 | } |
- | |
| 982 | } |
- | |
| - | 1372 | switch(file->Mode) |
|
| - | 1373 | { |
|
| 983 | return(file); |
1374 | case 'a': |
| 984 | } |
1375 | case 'w': |
| 985 | - | ||
| 986 | 1376 | if(file->ByteOfCurrSector > 0) // has data been added to the file? |
|
| 987 | //________________________________________________________________________________________________________________________________________ |
1377 | { |
| 988 | // Funtion: void FreeFilePointer_(File *); |
- | |
| 989 | // |
- | |
| 990 | // Description: This function free's the filepointer by marking it as unused. |
1378 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache))// save the data still in the buffer |
| 991 | // |
- | |
| 992 | // |
- | |
| 993 | // Return: none |
1379 | { |
| 994 | // |
- | |
| 995 | //________________________________________________________________________________________________________________________________________ |
- | |
| 996 | - | ||
| Line 997... | Line 1380... | ||
| 997 | void FreeFilePointer(File *file) |
1380 | Fat16_Deinit(); |
| 998 | { |
1381 | return(EOF); |
| 999 | u8 cnt = 0; |
- | |
| 1000 | 1382 | } |
|
| 1001 | for(cnt=0;cnt<__MAX_FILES_USED;cnt++) // Is the filepointeradress vaild? |
1383 | } |
| 1002 | { |
1384 | file->SectorInCache = file->DirectorySector; |
| 1003 | if(&FilePointer[cnt] == file) // filepointer found therefore it must be valid |
- | |
| 1004 | { |
1385 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) // read the directory entry for this file. |
| 1005 | FilePointer[cnt].state = _UNUSED; // and can be marked as unused. |
- | |
| 1006 | } |
- | |
| Line 1007... | Line -... | ||
| 1007 | } |
- | |
| 1008 | } |
- | |
| 1009 | - | ||
| 1010 | 1386 | { |
|
| 1011 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1012 | // Funtion: void DelteDirectoryEntry(Find *) |
- | |
| 1013 | // |
1387 | Fat16_Deinit(); |
| - | 1388 | return(EOF); |
|
| 1014 | // Description: This function deletes the directoryentry of the specified item. |
1389 | } |
| - | 1390 | ||
| - | 1391 | dir = (DirEntry_t *)file->Cache; |
|
| - | 1392 | dir[file->DirectoryIndex].Size = file->Size; // update file size |
|
| - | 1393 | dir[file->DirectoryIndex].DateTime = FileDateTime(&SystemTime); // update date time |
|
| 1015 | // |
1394 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) // write back to sd-card |
| 1016 | // |
- | |
| 1017 | // returnvalue: 1 if the directory could be created. |
1395 | { |
| 1018 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1019 | 1396 | Fat16_Deinit(); |
|
| 1020 | void DeleteDirectoryEntry(Find *item) |
1397 | return(EOF); |
| 1021 | { |
- | |
| 1022 | u8 buffer[512]; |
- | |
| 1023 | - | ||
| 1024 | 1398 | } |
|
| 1025 | SDC_GetSector((u32) item->cluster_pointer,buffer); // Read the Rootdirectory. |
- | |
| 1026 | DirectoryEntry = (struct DirEntry *)buffer; |
1399 | break; |
| 1027 | - | ||
| 1028 | DirectoryEntry[(item->directory_index)-1].attribute = 0; // free the directoryentry. |
- | |
| 1029 | DirectoryEntry[(item->directory_index)-1].name[0] = 0xE5; // free the directoryentry. |
- | |
| 1030 | SDC_PutSector((u32) item->cluster_pointer,buffer); // Read the Rootdirectory. |
- | |
| 1031 | } |
1400 | case 'r': |
| 1032 | - | ||
| 1033 | - | ||
| 1034 | 1401 | default: |
|
| 1035 | - | ||
| 1036 | //________________________________________________________________________________________________________________________________________ |
1402 | return(EOF); |
| 1037 | // Funtion: u8 CreateSubDirectory(u8 *) |
- | |
| 1038 | // |
- | |
| 1039 | // Description: This function creates an directory within the directory specified by CWD |
- | |
| 1040 | // |
- | |
| 1041 | // |
- | |
| 1042 | // returnvalue: 1 if the directory could be created. |
- | |
| 1043 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1044 | - | ||
| 1045 | u8 CreateSubDirectory(s8 *fname) |
- | |
| 1046 | { |
1403 | break; |
| - | 1404 | ||
| 1047 | u16 index = 0; // index to an entry in the rootdirectory. |
1405 | } |
| 1048 | u16 cnt_entries_searched = 0; // count the number of rootentries which have been searched already. |
1406 | return(0); |
| 1049 | u16 i = 0; |
1407 | } |
| - | 1408 | ||
| 1050 | u16 sector_offset = 0; // index to the sector of the entry which is searched momentarily |
1409 | /****************************************************************************************************************************************/ |
| - | 1410 | /* Function: fclose_(File *file); */ |
|
| 1051 | u8 retvalue = 0; |
1411 | /* */ |
| 1052 | u32 cluster_temp = 0; |
1412 | /* Description: This function closes the open file by writing the remaining data */ |
| 1053 | u16 cluster = 0; |
- | |
| 1054 | File file; |
- | |
| 1055 | u8 name[11] = {" "}; |
- | |
| 1056 | - | ||
| 1057 | SeperateFileName(fname,name); |
1413 | /* from the buffer to the device and entering the filesize in the directory entry. */ |
| 1058 | cluster_temp = (u32)FindNextFreeCluster(&file); // the next free cluster on the disk. |
- | |
| 1059 | - | ||
| 1060 | if(cluster_temp) // if a free cluster is available: |
- | |
| 1061 | { |
- | |
| 1062 | cluster = (u16)cluster_temp; // remember the index of the free datacluster found for the directory entry. |
- | |
| 1063 | cluster_temp -=2; // Clusterposition is ((position in FAT)-2). first two entries in FAT are reserved. |
- | |
| 1064 | cluster_temp *= SectorsPerCluster; // Calculate relative sectorindex of first datacluster. |
- | |
| 1065 | file.start_cluster = (FirstDataCluster + cluster_temp); // Calculate absolute sectorposition of first datacluster. |
1414 | /* */ |
| 1066 | file.cluster_pointer = file.start_cluster; // start reading the file with the first sector of the first datacluster. |
1415 | /* Returnvalue: 0 on success EOF on error */ |
| 1067 | - | ||
| 1068 | // -Initialise new cluster to zero-------------------------------------------------------- |
- | |
| 1069 | for(i=0;i<512;i++) |
1416 | /****************************************************************************************************************************************/ |
| 1070 | { |
1417 | int16_t fclose_(File_t *file) |
| 1071 | file.buffer[i] = 0; // initialise buffer to zero |
1418 | { |
| Line 1072... | Line -... | ||
| 1072 | } |
- | |
| 1073 | for(sector_offset=0;sector_offset<SectorsPerCluster;sector_offset++) // initialise all sectors of new cluster with buffer. |
1419 | int16_t returnvalue = EOF; |
| - | 1420 | ||
| 1074 | { |
1421 | if(file == NULL) return(returnvalue); |
| 1075 | SDC_PutSector((u32)(file.start_cluster + sector_offset),file.buffer); // save the initialised sector to the card. |
- | |
| 1076 | } |
1422 | returnvalue = fflush_(file); |
| 1077 | // -Create directoryentry "." ------------------------------------------------------------- |
- | |
| - | 1423 | UnlockFilePointer(file); |
|
| - | 1424 | return(returnvalue); |
|
| 1078 | DirectoryEntry = (struct DirEntry *)file.buffer; |
1425 | } |
| 1079 | DirectoryEntry[0].name[0] = '.'; |
1426 | |
| 1080 | DirectoryEntry[0].attribute = _DIRECTORY; |
- | |
| 1081 | DirectoryEntry[0].startcluster = cluster; |
1427 | /********************************************************************************************************************************************/ |
| 1082 | // -Create directoryentry "." ------------------------------------------------------------- |
1428 | /* Function: fgetc_(File *file); */ |
| 1083 | DirectoryEntry[1].name[0] = '.'; |
- | |
| 1084 | DirectoryEntry[1].name[1] = '.'; |
- | |
| 1085 | DirectoryEntry[1].attribute = _DIRECTORY; |
- | |
| 1086 | if(CWD == RootDirectory) |
1429 | /* */ |
| 1087 | { |
- | |
| 1088 | DirectoryEntry[1].startcluster = 0; |
- | |
| Line 1089... | Line 1430... | ||
| 1089 | } |
1430 | /* Description: This function reads and returns one character from the specified file. Is the end of the actual sector reached the */ |
| Line 1090... | Line 1431... | ||
| 1090 | else |
1431 | /* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
| 1091 | { |
1432 | /* */ |
| - | 1433 | /* Returnvalue: The function returns the character read from the specified memorylocation as u8 casted to s16 or EOF. */ |
|
| - | 1434 | /********************************************************************************************************************************************/ |
|
| - | 1435 | int16_t fgetc_(File_t *file) |
|
| - | 1436 | { |
|
| - | 1437 | int16_t c = EOF; |
|
| Line 1092... | Line 1438... | ||
| 1092 | cluster_temp = (CWD - FirstDataCluster); |
1438 | uint32_t curr_sector; |
| - | 1439 | ||
| - | 1440 | if( (!Partition.IsValid) || (file == NULL)) return(c); |
|
| 1093 | cluster_temp /= SectorsPerCluster; |
1441 | // if the end of the file is not reached, get the next character. |
| - | 1442 | if((0 < file->Size) && ((file->Position+1) < file->Size) ) |
|
| 1094 | cluster_temp -= 2; |
1443 | { |
| 1095 | DirectoryEntry[1].startcluster = (u16) cluster_temp; |
1444 | curr_sector = file->FirstSectorOfCurrCluster; // calculate the sector of the next character to be read. |
| 1096 | } |
1445 | curr_sector += file->SectorOfCurrCluster; |
| 1097 | SDC_PutSector((u32) file.start_cluster,file.buffer); // save the initialised sector to the card. |
1446 | |
| - | 1447 | if(file->SectorInCache != curr_sector) |
|
| - | 1448 | { |
|
| Line -... | Line 1449... | ||
| - | 1449 | file->SectorInCache = curr_sector; |
|
| - | 1450 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache,file->Cache)) |
|
| - | 1451 | { |
|
| - | 1452 | Fat16_Deinit(); |
|
| - | 1453 | return(c); |
|
| 1098 | // -create directoryentry within the cwd -------------------------------------------------- |
1454 | } |
| - | 1455 | } |
|
| 1099 | sector_offset = 0; |
1456 | c = (int16_t) file->Cache[file->ByteOfCurrSector]; |
| - | 1457 | file->Position++; // increment file position |
|
| - | 1458 | file->ByteOfCurrSector++; // goto next byte in sector |
|
| 1100 | cnt_entries_searched = 0; |
1459 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if end of sector |
| 1101 | do |
1460 | { |
| - | 1461 | file->ByteOfCurrSector = 0; // reset byte location |
|
| - | 1462 | file->SectorOfCurrCluster++; // next sector |
|
| 1102 | { // search the next 16 rootentries in this sector of the roordirectory. |
1463 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster) // if end of cluster is reached, the next datacluster has to be searched in the FAT. |
| - | 1464 | { |
|
| 1103 | index=0; |
1465 | |
| - | 1466 | if(GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
|
| 1104 | SDC_GetSector((u32)(CWD + sector_offset),file.buffer); // Read the actual directory. |
1467 | { |
| - | 1468 | file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
|
| - | 1469 | } |
|
| 1105 | DirectoryEntry = (struct DirEntry *)file.buffer; |
1470 | else // the last cluster was allready reached |
| 1106 | while((index<16) && (!retvalue)) |
1471 | { |
| 1107 | { |
1472 | file->SectorOfCurrCluster--; // jump back to the last sector in the last cluster |
| 1108 | if((DirectoryEntry[index].attribute == 0) || (DirectoryEntry[index].attribute == 0xE5)) // empty directory entry found |
- | |
| 1109 | { |
1473 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set ByteOfCurrSector one byte over sector end |
| 1110 | for(i=0;i<11;i++) DirectoryEntry[index].name[i] = name[i]; // Kopie the filename and the file extension to the directoryentry. |
1474 | } |
| 1111 | DirectoryEntry[index].attribute = _DIRECTORY; // Set the fileattribute to archive to reserve the directoryentry. |
1475 | } |
| 1112 | DirectoryEntry[index].startcluster = cluster; // copy the location of the first datacluster to the directoryentry. |
1476 | } |
| 1113 | DirectoryEntry[index].size = 0; // the new createted file has no content yet. |
- | |
| 1114 | file.directory_sector = (u32) (CWD + sector_offset); |
- | |
| 1115 | file.directory_index = (u8) index; |
- | |
| 1116 | retvalue = 1; |
- | |
| 1117 | SDC_PutSector((u32)(CWD + sector_offset),file.buffer); |
- | |
| 1118 | } |
1477 | } |
| 1119 | index++; |
1478 | return(c); |
| 1120 | cnt_entries_searched++; |
- | |
| 1121 | } |
1479 | } |
| 1122 | if(!retvalue) // file not found in this sector so take next sector. |
1480 | |
| Line -... | Line 1481... | ||
| - | 1481 | /********************************************************************************************************************************************/ |
|
| - | 1482 | /* Function: fputc_( const s8 c, File *file); */ |
|
| - | 1483 | /* */ |
|
| - | 1484 | /* Description: This function writes a byte to the specified file and takes care of writing the necessary FAT- Entries. */ |
|
| - | 1485 | /* next sector of the cluster is read. If the last sector of the cluster read the next cluster will be searched in FAT. */ |
|
| - | 1486 | /* */ |
|
| - | 1487 | /* Returnvalue: The function returns the character written to the stream or EOF on error. */ |
|
| - | 1488 | /********************************************************************************************************************************************/ |
|
| - | 1489 | int16_t fputc_(const int8_t c, File_t *file) |
|
| - | 1490 | { |
|
| - | 1491 | uint32_t curr_sector = 0; |
|
| - | 1492 | ||
| - | 1493 | if((!Partition.IsValid) || (file == NULL)) return(EOF); |
|
| - | 1494 | ||
| - | 1495 | // If file position equals to file size, then the end of file has reached. |
|
| Line 1123... | Line -... | ||
| 1123 | { |
- | |
| 1124 | index = 0; |
- | |
| 1125 | sector_offset++; |
- | |
| 1126 | } |
- | |
| 1127 | } |
- | |
| 1128 | while((cnt_entries_searched< PossibleRootEntries) && (!retvalue)); |
- | |
| 1129 | 1496 | // In this chase it has to be checked that the ByteOfCurrSector is BYTES_PER_SECTOR |
|
| 1130 | } |
- | |
| 1131 | return(retvalue); // return 1 if file has been created otherwise return 0. |
- | |
| 1132 | } |
- | |
| 1133 | - | ||
| 1134 | - | ||
| Line 1135... | Line 1497... | ||
| 1135 | //________________________________________________________________________________________________________________________________________ |
1497 | // and a new cluster should be appended. |
| Line 1136... | Line -... | ||
| 1136 | // Funtion: u16 SeekSubDirectory(s8 *fname) |
- | |
| 1137 | // |
- | |
| 1138 | // Description: looks for the specified directory within the CWD. |
1498 | if((file->Position >= file->Size) && (file->ByteOfCurrSector >= BYTES_PER_SECTOR)) |
| 1139 | // |
- | |
| 1140 | // Returnvalue: If the specified directory was found the startcluster is returned. otherwise 0. |
- | |
| 1141 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1142 | 1499 | { |
|
| - | 1500 | if(!AppendCluster(file)) return(EOF); |
|
| - | 1501 | } |
|
| - | 1502 | ||
| - | 1503 | curr_sector = file->FirstSectorOfCurrCluster; |
|
| - | 1504 | curr_sector += file->SectorOfCurrCluster; |
|
| - | 1505 | if(file->SectorInCache != curr_sector) |
|
| - | 1506 | { |
|
| - | 1507 | file->SectorInCache = curr_sector; |
|
| - | 1508 | if(SD_SUCCESS != SDC_GetSector(file->SectorInCache, file->Cache)) |
|
| - | 1509 | { |
|
| - | 1510 | Fat16_Deinit(); |
|
| - | 1511 | return(EOF); |
|
| 1143 | u16 SeekSubDirectory(s8 *fname) |
1512 | } |
| - | 1513 | } |
|
| - | 1514 | ||
| - | 1515 | file->Cache[file->ByteOfCurrSector] = (uint8_t)c; // write databyte into the buffer. The byte will be written to the device at once |
|
| 1144 | { |
1516 | 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. |
| 1145 | u16 index = 0; |
- | |
| 1146 | u16 end_of_directory_not_reached = 0; // the directory has been read completely without a result. |
1517 | file->Position++; // the actual positon within the file. |
| 1147 | u8 i = 0; |
1518 | file->ByteOfCurrSector++; // goto next byte in sector |
| Line 1148... | Line 1519... | ||
| 1148 | u16 cluster_temp = 0; |
1519 | if(file->ByteOfCurrSector >= BYTES_PER_SECTOR) // if the end of this sector is reached yet |
| - | 1520 | { // save the sector to the sd-card |
|
| 1149 | s8 name[11] = " "; |
1521 | if(SD_SUCCESS != SDC_PutSector(file->SectorInCache, file->Cache)) |
| 1150 | File file; |
- | |
| 1151 | 1522 | { |
|
| 1152 | SeperateFileName(fname,name); |
- | |
| 1153 | - | ||
| 1154 | file.cluster_pointer = CWD; // start looking for the file in the actual directory. |
1523 | Fat16_Deinit(); |
| 1155 | file.start_cluster = CWD; // start looking for the file in the actual directory. |
- | |
| 1156 | - | ||
| 1157 | // directory starts at sector specified by dir_sector. This can be the rootdirectory or any other directory. |
- | |
| 1158 | do |
- | |
| 1159 | { // search the next 16 rootentries in this sector of the roordirectory. |
- | |
| 1160 | index=0; |
1524 | return(EOF); |
| 1161 | SDC_GetSector((u32) file.cluster_pointer,file.buffer); // Read the Rootdirectory. |
- | |
| 1162 | DirectoryEntry = (struct DirEntry *)file.buffer; |
- | |
| 1163 | - | ||
| 1164 | while((!cluster_temp)&&(index<16)) |
1525 | } |
| 1165 | { |
- | |
| - | 1526 | file->ByteOfCurrSector = 0; // reset byte location |
|
| 1166 | i=0; |
1527 | file->SectorOfCurrCluster++; // next sector |
| 1167 | if(DirectoryEntry[index].name[0] != 0xe5) // ignore deleted items. |
- | |
| 1168 | { |
1528 | if(file->SectorOfCurrCluster >= Partition.SectorsPerCluster)// if end of cluster is reached, the next datacluster has to be searched in the FAT. |
| 1169 | while((i<=10)&&(DirectoryEntry[index].name[i] == name[i])) |
1529 | { |
| 1170 | { |
1530 | if(!GetNextCluster(file)) // Sets the clusterpointer of the file to the next datacluster. |
| 1171 | i++; |
1531 | { // if current cluster was the last cluster of the file |
| 1172 | } |
- | |
| 1173 | } |
- | |
| 1174 | - | ||
| 1175 | if((i==11) && (DirectoryEntry[index].attribute & _DIRECTORY)) // entry found!! -> reading startcluster of entry from offset 26. |
- | |
| 1176 | { |
- | |
| 1177 | cluster_temp = (u16)DirectoryEntry[index].startcluster; |
1532 | if(!AppendCluster(file)) // append a new and free cluster at the end of the file. |
| 1178 | } |
1533 | { |
| 1179 | index++; |
- | |
| 1180 | } |
- | |
| 1181 | if(!cluster_temp) // file not found in this sector so take next sector. |
- | |
| 1182 | { |
- | |
| Line -... | Line 1534... | ||
| - | 1534 | file->SectorOfCurrCluster--; // jump back to last sector of last cluster |
|
| Line 1183... | Line -... | ||
| 1183 | end_of_directory_not_reached = GetNextCluster(&file); |
- | |
| 1184 | } |
- | |
| 1185 | } |
- | |
| 1186 | while((end_of_directory_not_reached) && (!cluster_temp)); |
- | |
| 1187 | return(cluster_temp); |
- | |
| 1188 | } |
- | |
| 1189 | - | ||
| 1190 | - | ||
| 1191 | - | ||
| 1192 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1193 | // Funtion: u8 mkdir_(u8 *) |
- | |
| 1194 | // |
1535 | file->ByteOfCurrSector = BYTES_PER_SECTOR; // set byte location to 1 byte over sector len |
| 1195 | // Description: This function checks if the directory to be created already exists. If not the directory will be created. |
- | |
| 1196 | // |
- | |
| 1197 | // |
- | |
| 1198 | // returnvalue: 1 if the directory could be created. |
- | |
| 1199 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1200 | - | ||
| 1201 | u8 mkdir_(s8 *fname) |
- | |
| 1202 | { |
- | |
| 1203 | u8 retvalue = 0; |
- | |
| 1204 | - | ||
| 1205 | retvalue = SeekSubDirectory(fname); // check wether the specified directory already exists. |
- | |
| 1206 | - | ||
| 1207 | if(!retvalue) |
- | |
| 1208 | { |
- | |
| 1209 | CreateSubDirectory(fname); // if directory doesn't exist, create it. |
- | |
| Line -... | Line 1536... | ||
| - | 1536 | return(EOF); |
|
| - | 1537 | } |
|
| - | 1538 | } |
|
| 1210 | retvalue = 1; |
1539 | else // next cluster |
| 1211 | } |
1540 | { |
| - | 1541 | file->SectorOfCurrCluster = 0; // start reading new cluster at first sector of the cluster. |
|
| 1212 | else |
1542 | } |
| 1213 | { |
- | |
| 1214 | retvalue = 0; |
1543 | } |
| 1215 | } |
- | |
| 1216 | - | ||
| 1217 | return(retvalue); |
1544 | } |
| 1218 | } |
1545 | return(0); |
| 1219 | 1546 | } |
|
| 1220 | 1547 | ||
| 1221 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1222 | // Funtion: u8 chdir_(u8 *) |
1548 | |
| 1223 | // |
- | |
| 1224 | // Description: This function changes the CWD to the directory specified. |
- | |
| 1225 | // |
- | |
| 1226 | // |
- | |
| 1227 | // returnvalue: 1 if the directory could be changed. |
- | |
| 1228 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1229 | - | ||
| 1230 | u8 chdir_(s8 *fname) |
- | |
| 1231 | { |
- | |
| 1232 | u8 retvalue = 0; |
- | |
| 1233 | u8 name[11] = {" "}; |
- | |
| 1234 | - | ||
| 1235 | u32 ultemp = 0; |
- | |
| 1236 | - | ||
| 1237 | SeperateFileName(fname,name); |
- | |
| 1238 | - | ||
| 1239 | ultemp = (u32)SeekSubDirectory(name); |
- | |
| 1240 | if(ultemp >= 2) |
- | |
| 1241 | { |
- | |
| 1242 | ultemp -=2; // Clusterposition is ((position in FAT)-2). first two entries in FAT are reserved. |
- | |
| 1243 | ultemp *= SectorsPerCluster; // Calculate relative sectorindex of first datacluster. |
- | |
| 1244 | ultemp += FirstDataCluster; |
1549 | /****************************************************************************************************************************************/ |
| 1245 | CWD = ultemp; |
1550 | /* Function: fread_(void *buffer, uint32_t size, uint32_t count, File *File); */ |
| 1246 | retvalue = 1; |
- | |
| 1247 | } |
- | |
| 1248 | else |
- | |
| 1249 | { |
- | |
| 1250 | CWD = RootDirectory; |
- | |
| 1251 | retvalue = 1; |
1551 | /* */ |
| 1252 | } |
1552 | /* Description: This function reads count objects of the specified size */ |
| 1253 | 1553 | /* from the actual position of the file to the specified buffer. */ |
|
| 1254 | return(retvalue); |
- | |
| Line 1255... | Line 1554... | ||
| 1255 | } |
1554 | /* */ |
| 1256 | 1555 | /* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
|
| Line 1257... | Line 1556... | ||
| 1257 | 1556 | /****************************************************************************************************************************************/ |
|
| 1258 | //________________________________________________________________________________________________________________________________________ |
1557 | uint32_t fread_(void *buffer, uint32_t size, uint32_t count, File_t *file) |
| 1259 | // Funtion: u8 FindItem(s8 *fname, Find *) |
- | |
| - | 1558 | { |
|
| 1260 | // |
1559 | uint32_t object_cnt = 0; // count the number of objects read from the file. |
| 1261 | // Description: finds an item (file or directory) within common working directory (cwd). Wildcards '*' or '?' will be considered. |
- | |
| - | 1560 | uint32_t object_size = 0; // count the number of bytes read from the actual object. |
|
| 1262 | // |
1561 | uint8_t *pbuff = 0; // a pointer to the actual bufferposition. |
| 1263 | // Returnvalue: If an item was found this function returns '1' else '0'. |
1562 | uint8_t success = 1; // no error occured during read operation to the file. |
| 1264 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1265 | 1563 | int16_t c; |
|
| 1266 | u8 FindItem(Find *item) |
1564 | |
| 1267 | { |
1565 | if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
| 1268 | u16 index = 0; |
1566 | |
| Line -... | Line 1567... | ||
| - | 1567 | pbuff = (uint8_t *) buffer; // cast the void pointer to an u8 * |
|
| - | 1568 | ||
| 1269 | u16 end_of_directory_not_reached = 0; // the directory has been read completely without a result. |
1569 | while((object_cnt < count) && success) |
| 1270 | u8 i = 0; |
1570 | { |
| 1271 | u8 readpointer = 0; |
1571 | object_size = size; |
| 1272 | u8 writepointer = 0; |
1572 | while((size > 0) && success) |
| 1273 | u8 retvalue = 0; |
1573 | { |
| 1274 | File file; |
- | |
| 1275 | - | ||
| 1276 | - | ||
| 1277 | file.cluster_pointer = item->cluster_pointer; |
- | |
| 1278 | file.start_cluster = item->cluster_pointer; |
- | |
| 1279 | index = item->directory_index; |
- | |
| 1280 | // directory starts at sector specified by dir_sector. This can be the rootdirectory or any other directory. |
- | |
| 1281 | do |
- | |
| 1282 | { // search the next 16 rootentries in this sector of the roordirectory. |
- | |
| 1283 | SDC_GetSector((u32) file.cluster_pointer,file.buffer); // Read the Rootdirectory. |
1574 | c = fgetc_(file); |
| 1284 | DirectoryEntry = (struct DirEntry *)file.buffer; |
1575 | if(c != EOF) |
| Line 1285... | Line -... | ||
| 1285 | - | ||
| 1286 | while((!retvalue)&&(index<16)) |
1576 | { |
| - | 1577 | *pbuff = (uint8_t)c; // read a byte from the buffer to the opened file. |
|
| 1287 | { |
1578 | pbuff++; |
| 1288 | i=0; |
- | |
| 1289 | if(DirectoryEntry[index].name[0] != 0xe5) // ignore deleted items. |
1579 | size--; |
| 1290 | { |
- | |
| - | 1580 | } |
|
| 1291 | while((i<=10)&&((DirectoryEntry[index].name[i] == item->searchstring[i]) || (item->searchstring[i]=='*') || item->searchstring[i]=='?')) |
1581 | else // error or end of file reached |
| 1292 | { |
1582 | { |
| - | 1583 | success = 0; |
|
| 1293 | i++; |
1584 | } |
| - | 1585 | } |
|
| - | 1586 | if(success) object_cnt++; |
|
| 1294 | } |
1587 | } |
| - | 1588 | return(object_cnt); // return the number of objects succesfully read from the file |
|
| 1295 | } |
1589 | } |
| - | 1590 | ||
| 1296 | 1591 | ||
| - | 1592 | /****************************************************************************************************************************************/ |
|
| - | 1593 | /* Function: fwrite_(void *buffer, uint32_t size, uint32_t count, File *file); */ |
|
| - | 1594 | /* */ |
|
| 1297 | if((i==11) && (DirectoryEntry[index].attribute & item->attribute)) |
1595 | /* Description: This function writes count objects of the specified size */ |
| - | 1596 | /* from the buffer pointer to the actual position in the file. */ |
|
| - | 1597 | /* */ |
|
| 1298 | { |
1598 | /* Returnvalue: The function returns the number of objects (not bytes) read from the file. */ |
| 1299 | for(readpointer=0;readpointer<=10;readpointer++) |
1599 | /****************************************************************************************************************************************/ |
| 1300 | { |
1600 | uint32_t fwrite_(void *buffer, uint32_t size, uint32_t count, File_t *file) |
| - | 1601 | { |
|
| - | 1602 | uint32_t object_cnt = 0; // count the number of objects written to the file. |
|
| - | 1603 | uint32_t object_size = 0; // count the number of bytes written from the actual object. |
|
| 1301 | if(DirectoryEntry[index].name[readpointer] != ' ') |
1604 | uint8_t *pbuff = 0; // a pointer to the actual bufferposition. |
| - | 1605 | uint8_t success = 1; // no error occured during write operation to the file. |
|
| 1302 | { |
1606 | int16_t c; |
| - | 1607 | ||
| 1303 | item->name[writepointer] = DirectoryEntry[index].name[readpointer]; // copy the name of the item found to the find_structure. |
1608 | if((!Partition.IsValid) || (file == NULL) || (buffer == NULL)) return(0); |
| 1304 | writepointer++; |
- | |
| 1305 | } |
- | |
| 1306 | else if((readpointer==7) && (DirectoryEntry[index].attribute == _FILE)) // if the item found is a file |
- | |
| 1307 | { |
1609 | |
| 1308 | if(DirectoryEntry[index].name[readpointer] != ' ') |
1610 | pbuff = (uint8_t *) buffer; // cast the void pointer to an u8 * |
| Line 1309... | Line -... | ||
| 1309 | { |
- | |
| 1310 | item->name[writepointer] = DirectoryEntry[index].name[readpointer]; // copy the name of the item found to the find_structure. |
- | |
| 1311 | writepointer++; |
1611 | |
| 1312 | } |
1612 | while((object_cnt < count) && success) |
| 1313 | item->name[writepointer] = '.'; // then seperate the name and the extension by a '.' at index 8. |
- | |
| - | 1613 | { |
|
| 1314 | writepointer++; |
1614 | object_size = size; |
| - | 1615 | while((size > 0) && success) |
|
| - | 1616 | { |
|
| - | 1617 | c = fputc_(*pbuff, file); // write a byte from the buffer to the opened file. |
|
| - | 1618 | if(c != EOF) |
|
| 1315 | } |
1619 | { |
| - | 1620 | pbuff++; |
|
| 1316 | } |
1621 | size--; |
| - | 1622 | } |
|
| 1317 | item->startcluster = (u16)DirectoryEntry[index].startcluster; |
1623 | else |
| - | 1624 | { |
|
| - | 1625 | success = 0; |
|
| 1318 | item->directory_index = ++index; |
1626 | } |
| 1319 | item->cluster_pointer = file.cluster_pointer; |
1627 | } |
| - | 1628 | if(success) object_cnt++; |
|
| - | 1629 | } |
|
| - | 1630 | ||
| - | 1631 | return(object_cnt); // return the number of objects succesfully written to the file |
|
| - | 1632 | } |
|
| - | 1633 | ||
| - | 1634 | ||
| 1320 | retvalue = 1; |
1635 | /****************************************************************************************************************************************/ |
| 1321 | } |
1636 | /* Function: fputs_(const int8_t *string, File_t *File); */ |
| 1322 | index++; |
- | |
| 1323 | } |
- | |
| 1324 | if(!retvalue) // file not found in this sector so take next sector. |
- | |
| 1325 | { |
- | |
| 1326 | end_of_directory_not_reached = GetNextCluster(&file); |
- | |
| 1327 | } |
- | |
| 1328 | index = 0; |
1637 | /* */ |
| 1329 | } |
1638 | /* Description: This function writes a string to the specified file. */ |
| 1330 | while((end_of_directory_not_reached) && (!retvalue)); |
1639 | /* */ |
| 1331 | - | ||
| 1332 | return(retvalue); |
- | |
| 1333 | } |
- | |
| 1334 | - | ||
| 1335 | - | ||
| 1336 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1337 | // Funtion: u8 findfirst(s8 *fname, Find *) |
- | |
| 1338 | // |
- | |
| 1339 | // Description: finds the first item (file or directory) within common working directory (cwd). Wildcards '*' or '?' will be considered. |
- | |
| 1340 | // |
- | |
| 1341 | // Returnvalue: If an item was found this function returns '1' else '0'. |
- | |
| 1342 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1343 | - | ||
| 1344 | u8 findfirst_(s8 *fname, Find *item, u8 attribute) |
- | |
| 1345 | { |
- | |
| 1346 | u8 retvalue = 0; |
- | |
| 1347 | u8 i = 0; |
- | |
| 1348 | 1640 | /* Returnvalue: The function returns a no negative value or EOF on error. */ |
|
| 1349 | for(i=0;i<=11;i++) |
- | |
| 1350 | { |
- | |
| 1351 | item->searchstring[i] = '*'; // initialise the searchstring with wildcards. |
- | |
| 1352 | item->name[i] = 0; |
- | |
| 1353 | } |
- | |
| 1354 | - | ||
| 1355 | SeperateFileName(fname,item->searchstring); |
- | |
| 1356 | - | ||
| 1357 | item->cluster_pointer = CWD; // findfirst_ starts at the beginning of the cwd. |
- | |
| 1358 | item->directory_index = 0; |
- | |
| 1359 | item->attribute = attribute; |
- | |
| 1360 | - | ||
| 1361 | retvalue = FindItem(item); |
- | |
| 1362 | - | ||
| 1363 | return(retvalue); |
- | |
| 1364 | } |
- | |
| 1365 | - | ||
| 1366 | - | ||
| 1367 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1368 | // Funtion: u8 findnext(Find *) |
- | |
| 1369 | // |
1641 | /****************************************************************************************************************************************/ |
| 1370 | // Description: finds the first item (file or directory) within common working directory (cwd). Wildcards '*' or '?' will be considered. |
- | |
| 1371 | // |
- | |
| 1372 | // Returnvalue: If an item was found this function returns '1' else '0'. |
- | |
| 1373 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1374 | - | ||
| 1375 | 1642 | int16_t fputs_(const int8_t *string, File_t *file) |
|
| 1376 | u8 findnext_(Find *item) |
1643 | { |
| 1377 | { |
- | |
| 1378 | u8 retvalue = 0; |
- | |
| 1379 | u8 i = 0; |
- | |
| 1380 | - | ||
| 1381 | for(i=0;i<=11;i++) |
- | |
| 1382 | { |
- | |
| 1383 | item->name[i] = 0; |
- | |
| 1384 | } |
- | |
| 1385 | - | ||
| 1386 | retvalue = FindItem(item); |
- | |
| 1387 | - | ||
| 1388 | return(retvalue); |
- | |
| 1389 | } |
- | |
| 1390 | - | ||
| 1391 | - | ||
| 1392 | - | ||
| 1393 | //________________________________________________________________________________________________________________________________________ |
- | |
| 1394 | // Funtion: u8 fdelete(s8 *fname) |
1644 | uint8_t i=0; |
| 1395 | // |
- | |
| 1396 | // Description: Deletes the file specified by fname. |
- | |
| 1397 | // |
- | |
| 1398 | // Returnvalue: |
- | |
| 1399 | //________________________________________________________________________________________________________________________________________ |
1645 | int16_t c = 0; |
| Line -... | Line 1646... | ||
| - | 1646 | ||