/* gba_nds_fat.c By chishm (Michael Chisholm) Routines for reading a compact flash card using the GBA Movie Player or M3. Some FAT routines are based on those in fat.c, which is part of avrlib by Pascal Stang. This software is completely free. No warranty is provided. If you use it, please give me credit and email me about your project at chishm@hotmail.com See gba_nds_fat.txt for help and license details. */ //--------------------------------------------------------------- // Includes #include "gba_nds_fat.h" #include "disc_io.h" #include #ifdef NDS // #include // Time on the NDS #include #endif //---------------------------------------------------------------- // Data types #ifndef NULL #define NULL 0 #endif //---------------------------------------------------------------- // NDS memory access control register #ifdef NDS #ifndef WAIT_CR #define WAIT_CR (*(vu16*)0x04000204) #endif #endif //--------------------------------------------------------------- // Appropriate placement of CF functions and data #ifdef NDS #define _VARS_IN_RAM #else #define _VARS_IN_RAM __attribute__ ((section (".sbss"))) #endif //----------------------------------------------------------------- // FAT constants #define CLUSTER_EOF_16 0xFFFF #define CLUSTER_EOF 0x0FFFFFFF #define CLUSTER_FREE 0x0000 #define CLUSTER_FIRST 0x0002 #define FILE_LAST 0x00 #define FILE_FREE 0xE5 #define FAT16_ROOT_DIR_CLUSTER 0x00 //----------------------------------------------------------------- // long file name constants #define LFN_END 0x40 #define LFN_DEL 0x80 //----------------------------------------------------------------- // Data Structures // Take care of packing for GCC - it doesn't obey pragma pack() // properly for ARM targets. #ifdef __GNUC__ #define __PACKED __attribute__ ((__packed__)) #else #define __PACKED #pragma pack(1) #endif // Boot Sector - must be packed typedef struct { u8 jmpBoot[3]; u8 OEMName[8]; // BIOS Parameter Block u16 bytesPerSector; u8 sectorsPerCluster; u16 reservedSectors; u8 numFATs; u16 rootEntries; u16 numSectorsSmall; u8 mediaDesc; u16 sectorsPerFAT; u16 sectorsPerTrk; u16 numHeads; u32 numHiddenSectors; u32 numSectors; union // Different types of extended BIOS Parameter Block for FAT16 and FAT32 { struct { // Ext BIOS Parameter Block for FAT16 u8 driveNumber; u8 reserved1; u8 extBootSig; u32 volumeID; u8 volumeLabel[11]; u8 fileSysType[8]; // Bootcode u8 bootCode[448]; } __PACKED fat16; struct { // FAT32 extended block u32 sectorsPerFAT32; u16 extFlags; u16 fsVer; u32 rootClus; u16 fsInfo; u16 bkBootSec; u8 reserved[12]; // Ext BIOS Parameter Block for FAT16 u8 driveNumber; u8 reserved1; u8 extBootSig; u32 volumeID; u8 volumeLabel[11]; u8 fileSysType[8]; // Bootcode u8 bootCode[420]; } __PACKED fat32; } __PACKED extBlock; u16 bootSig; } __PACKED BOOT_SEC; // Directory entry - must be packed typedef struct { u8 name[8]; u8 ext[3]; u8 attrib; u8 reserved; u8 cTime_ms; u16 cTime; u16 cDate; u16 aDate; u16 startClusterHigh; u16 mTime; u16 mDate; u16 startCluster; u32 fileSize; } __PACKED DIR_ENT; // Long file name directory entry - must be packed typedef struct { u8 ordinal; // Position within LFN u16 char0; u16 char1; u16 char2; u16 char3; u16 char4; u8 flag; // Should be equal to ATTRIB_LFN u8 reserved1; // Always 0x00 u8 checkSum; // Checksum of short file name (alias) u16 char5; u16 char6; u16 char7; u16 char8; u16 char9; u16 char10; u16 reserved2; // Always 0x0000 u16 char11; u16 char12; } __PACKED DIR_ENT_LFN; const char lfn_offset_table[13]={0x01,0x03,0x05,0x07,0x09,0x0E,0x10,0x12,0x14,0x16,0x18,0x1C,0x1E}; // End of packed structs #ifdef __PACKED #undef __PACKED #endif #ifndef __GNUC__ #pragma pack() #endif //----------------------------------------------------------------- // Global Variables // _VARS_IN_RAM variables are stored in the largest section of WRAM // available: IWRAM on NDS ARM7, EWRAM on NDS ARM9 and GBA // Files _VARS_IN_RAM FAT_FILE openFiles[MAX_FILES_OPEN]; // Long File names _VARS_IN_RAM char lfnName[MAX_FILENAME_LENGTH]; bool lfnExists; // Locations on card int filesysRootDir; int filesysRootDirClus; int filesysFAT; int filesysSecPerFAT; int filesysNumSec; int filesysData; int filesysBytePerSec; int filesysSecPerClus; int filesysBytePerClus; FS_TYPE filesysType = FS_UNKNOWN; u32 filesysTotalSize; // Info about FAT u32 fatLastCluster; u32 fatFirstFree; // fatBuffer used to reduce wear on the CF card from multiple writes _VARS_IN_RAM char fatBuffer[BYTE_PER_READ]; u32 fatBufferCurSector; // Current working directory u32 curWorkDirCluster; // Position of the directory entry last retreived with FAT_GetDirEntry u32 wrkDirCluster; int wrkDirSector; int wrkDirOffset; // Global sector buffer to save on stack space _VARS_IN_RAM unsigned char globalBuffer[BYTE_PER_READ]; //----------------------------------------------------------------- // Functions contained in this file - predeclarations char ucase (char character); u16 getRTCtoFileTime (void); u16 getRTCtoFileDate (void); bool FAT_AddDirEntry (const char* path, DIR_ENT newDirEntry); bool FAT_ClearLinks (u32 cluster); DIR_ENT FAT_DirEntFromPath (const char* path); u32 FAT_FirstFreeCluster(void); DIR_ENT FAT_GetDirEntry ( u32 dirCluster, int entry, int origin); u32 FAT_LinkFreeCluster(u32 cluster); u32 FAT_NextCluster(u32 cluster); bool FAT_WriteFatEntry (u32 cluster, u32 value); bool FAT_GetFilename (DIR_ENT dirEntry, char* alias); bool FAT_InitFiles (void); bool FAT_FreeFiles (void); int FAT_remove (const char* path); bool FAT_chdir (const char* path); FILE_TYPE FAT_FindFirstFile (char* filename); FILE_TYPE FAT_FindNextFile (char* filename); FILE_TYPE FAT_FileExists (const char* filename); bool FAT_GetAlias (char* alias); bool FAT_GetLongFilename (char* filename); u32 FAT_GetFileSize (void); u32 FAT_GetFileCluster (void); FAT_FILE* FAT_fopen(const char* path, const char* mode); bool FAT_fclose (FAT_FILE* file); bool FAT_feof(FAT_FILE* file); int FAT_fseek(FAT_FILE* file, s32 offset, int origin); u32 FAT_ftell (FAT_FILE* file); u32 FAT_fread (void* buffer, u32 size, u32 count, FAT_FILE* file); u32 FAT_fwrite (const void* buffer, u32 size, u32 count, FAT_FILE* file); char FAT_fgetc (FAT_FILE* file); char FAT_fputc (char c, FAT_FILE* file); /*----------------------------------------------------------------- ucase Returns the uppercase version of the given char char IN: a character char return OUT: uppercase version of character -----------------------------------------------------------------*/ char ucase (char character) { if ((character > 0x60) && (character < 0x7B)) character = character - 0x20; return (character); } /*----------------------------------------------------------------- getRTCtoFileTime and getRTCtoFileDate Returns the time / date in Dir Entry styled format u16 return OUT: time / date in Dir Entry styled format -----------------------------------------------------------------*/ u16 getRTCtoFileTime (void) { #ifdef NDS return ( ( ( (IPC->rtc_hours > 11 ? IPC->rtc_hours - 40 : IPC->rtc_hours) & 0x1F) << 11) | ( (IPC->rtc_minutes & 0x3F) << 5) | ( (IPC->rtc_seconds >> 1) & 0x1F) ); #else return 0; #endif } u16 getRTCtoFileDate (void) { #ifdef NDS return ( ( ((IPC->rtc_year + 20) & 0x7F) <<9) | ( (IPC->rtc_month & 0xF) << 5) | (IPC->rtc_day & 0x1F) ); #else return 0; #endif } /*----------------------------------------------------------------- Disc level FAT routines -----------------------------------------------------------------*/ #define FAT_ClustToSect(m) \ (((m-2) * filesysSecPerClus) + filesysData) /*----------------------------------------------------------------- FAT_NextCluster Internal function - gets the cluster linked from input cluster -----------------------------------------------------------------*/ u32 FAT_NextCluster(u32 cluster) { u32 nextCluster = CLUSTER_FREE; u32 sector; int offset; switch (filesysType) { case FS_UNKNOWN: nextCluster = CLUSTER_FREE; break; case FS_FAT12: sector = filesysFAT + (((cluster * 3) / 2) / BYTE_PER_READ); offset = ((cluster * 3) / 2) % BYTE_PER_READ; // If FAT buffer contains wrong sector if (sector != fatBufferCurSector) { // Load correct sector to buffer fatBufferCurSector = sector; disc_ReadSector(fatBufferCurSector, fatBuffer); } nextCluster = ((u8*)fatBuffer)[offset]; offset++; if (offset >= BYTE_PER_READ) { offset = 0; fatBufferCurSector++; disc_ReadSector(fatBufferCurSector, fatBuffer); } nextCluster |= (((u8*)fatBuffer)[offset]) << 8; if (cluster & 0x01) { nextCluster = nextCluster >> 4; } else { nextCluster &= 0x0FFF; } if (nextCluster >= 0x0FF7) { nextCluster = CLUSTER_EOF; } break; case FS_FAT16: sector = filesysFAT + ((cluster << 1) / BYTE_PER_READ); offset = cluster % (BYTE_PER_READ >> 1); // If FAT buffer contains wrong sector if (sector != fatBufferCurSector) { // Load correct sector to buffer fatBufferCurSector = sector; disc_ReadSector(fatBufferCurSector, fatBuffer); } // read the nextCluster value nextCluster = ((u16*)fatBuffer)[offset]; if (nextCluster >= 0xFFF7) { nextCluster = CLUSTER_EOF; } break; case FS_FAT32: sector = filesysFAT + ((cluster << 2) / BYTE_PER_READ); offset = cluster % (BYTE_PER_READ >> 2); // If FAT buffer contains wrong sector if (sector != fatBufferCurSector) { // Load correct sector to buffer fatBufferCurSector = sector; disc_ReadSector(fatBufferCurSector, fatBuffer); } // read the nextCluster value nextCluster = (((u32*)fatBuffer)[offset]) & 0x0FFFFFFF; if (nextCluster >= 0x0FFFFFF7) { nextCluster = CLUSTER_EOF; } break; default: nextCluster = CLUSTER_FREE; break; } return nextCluster; } #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_WriteFatEntry Internal function - writes FAT information about a cluster -----------------------------------------------------------------*/ bool FAT_WriteFatEntry (u32 cluster, u32 value) { u32 sector; int offset; if ((cluster < 0x0002) || (cluster > fatLastCluster)) { return false; } switch (filesysType) { case FS_UNKNOWN: return false; break; case FS_FAT12: sector = filesysFAT + (((cluster * 3) / 2) / BYTE_PER_READ); offset = ((cluster * 3) / 2) % BYTE_PER_READ; // If FAT buffer contains wrong sector if (sector != fatBufferCurSector) { // Load correct sector to buffer fatBufferCurSector = sector; disc_ReadSector(fatBufferCurSector, fatBuffer); } if (cluster & 0x01) { ((u8*)fatBuffer)[offset] = (((u8*)fatBuffer)[offset] & 0x0F) | ((value & 0x0F) << 4); offset++; if (offset >= BYTE_PER_READ) { offset = 0; // write the buffer back to disc disc_WriteSector(fatBufferCurSector, fatBuffer); // read the next sector fatBufferCurSector++; disc_ReadSector(fatBufferCurSector, fatBuffer); } ((u8*)fatBuffer)[offset] = (value & 0x0FF0) >> 4; } else { ((u8*)fatBuffer)[offset] = value & 0xFF; offset++; if (offset >= BYTE_PER_READ) { offset = 0; // write the buffer back to disc disc_WriteSector(fatBufferCurSector, fatBuffer); // read the next sector fatBufferCurSector++; disc_ReadSector(fatBufferCurSector, fatBuffer); } ((u8*)fatBuffer)[offset] = (((u8*)fatBuffer)[offset] & 0xF0) | ((value >> 8) & 0x0F); } break; case FS_FAT16: sector = filesysFAT + ((cluster << 1) / BYTE_PER_READ); offset = cluster % (BYTE_PER_READ >> 1); // If FAT buffer contains wrong sector if (sector != fatBufferCurSector) { // Load correct sector to buffer fatBufferCurSector = sector; disc_ReadSector(fatBufferCurSector, fatBuffer); } // write the value to the FAT buffer ((u16*)fatBuffer)[offset] = (value & 0xFFFF); break; case FS_FAT32: sector = filesysFAT + ((cluster << 2) / BYTE_PER_READ); offset = cluster % (BYTE_PER_READ >> 2); // If FAT buffer contains wrong sector if (sector != fatBufferCurSector) { // Load correct sector to buffer fatBufferCurSector = sector; disc_ReadSector(fatBufferCurSector, fatBuffer); } // write the value to the FAT buffer (((u32*)fatBuffer)[offset]) = value; break; default: return false; break; } // write the buffer back to disc disc_WriteSector(fatBufferCurSector, fatBuffer); return true; } #endif #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_ReadWriteFatEntryBuffered Internal function - writes FAT information about a cluster to a buffer that should then be flushed to disc using FAT_WriteFatEntryFlushBuffer() Call FAT_WriteFatEntry first so as not to ruin the disc. Also returns the entry being replaced -----------------------------------------------------------------*/ u32 FAT_ReadWriteFatEntryBuffered (u32 cluster, u32 value) { u32 sector; int offset; u32 oldValue; if ((cluster < 0x0002) || (cluster > fatLastCluster)) return CLUSTER_FREE; switch (filesysType) { case FS_UNKNOWN: oldValue = CLUSTER_FREE; break; case FS_FAT12: sector = filesysFAT + (((cluster * 3) / 2) / BYTE_PER_READ); offset = ((cluster * 3) / 2) % BYTE_PER_READ; // If FAT buffer contains wrong sector if (sector != fatBufferCurSector) { // write the old buffer to disc if ((fatBufferCurSector >= filesysFAT) && (fatBufferCurSector < (filesysFAT + filesysSecPerFAT))) disc_WriteSector(fatBufferCurSector, fatBuffer); // Load correct sector to buffer fatBufferCurSector = sector; disc_ReadSector(fatBufferCurSector, fatBuffer); } if (cluster & 0x01) { oldValue = (((u8*)fatBuffer)[offset] & 0xF0) >> 4; ((u8*)fatBuffer)[offset] = (((u8*)fatBuffer)[offset] & 0x0F) | ((value & 0x0F) << 4); offset++; if (offset >= BYTE_PER_READ) { offset = 0; // write the buffer back to disc disc_WriteSector(fatBufferCurSector, fatBuffer); // read the next sector fatBufferCurSector++; disc_ReadSector(fatBufferCurSector, fatBuffer); } oldValue |= ((((u8*)fatBuffer)[offset]) << 4) & 0x0FF0; ((u8*)fatBuffer)[offset] = (value & 0x0FF0) >> 4; } else { oldValue = ((u8*)fatBuffer)[offset] & 0xFF; ((u8*)fatBuffer)[offset] = value & 0xFF; offset++; if (offset >= BYTE_PER_READ) { offset = 0; // write the buffer back to disc disc_WriteSector(fatBufferCurSector, fatBuffer); // read the next sector fatBufferCurSector++; disc_ReadSector(fatBufferCurSector, fatBuffer); } oldValue |= (((u8*)fatBuffer)[offset] & 0x0F) << 8; ((u8*)fatBuffer)[offset] = (((u8*)fatBuffer)[offset] & 0xF0) | ((value >> 8) & 0x0F); } if (oldValue >= 0x0FF7) { oldValue = CLUSTER_EOF; } break; case FS_FAT16: sector = filesysFAT + ((cluster << 1) / BYTE_PER_READ); offset = cluster % (BYTE_PER_READ >> 1); // If FAT buffer contains wrong sector if (sector != fatBufferCurSector) { // write the old buffer to disc if ((fatBufferCurSector >= filesysFAT) && (fatBufferCurSector < (filesysFAT + filesysSecPerFAT))) disc_WriteSector(fatBufferCurSector, fatBuffer); // Load correct sector to buffer fatBufferCurSector = sector; disc_ReadSector(fatBufferCurSector, fatBuffer); } // write the value to the FAT buffer oldValue = ((u16*)fatBuffer)[offset]; ((u16*)fatBuffer)[offset] = value; if (oldValue >= 0xFFF7) { oldValue = CLUSTER_EOF; } break; case FS_FAT32: sector = filesysFAT + ((cluster << 2) / BYTE_PER_READ); offset = cluster % (BYTE_PER_READ >> 2); // If FAT buffer contains wrong sector if (sector != fatBufferCurSector) { // write the old buffer to disc if ((fatBufferCurSector >= filesysFAT) && (fatBufferCurSector < (filesysFAT + filesysSecPerFAT))) disc_WriteSector(fatBufferCurSector, fatBuffer); // Load correct sector to buffer fatBufferCurSector = sector; disc_ReadSector(fatBufferCurSector, fatBuffer); } // write the value to the FAT buffer oldValue = ((u32*)fatBuffer)[offset]; ((u32*)fatBuffer)[offset] = value; if (oldValue >= 0x0FFFFFF7) { oldValue = CLUSTER_EOF; } break; default: oldValue = CLUSTER_FREE; break; } return oldValue; } #endif #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_WriteFatEntryFlushBuffer Flush the FAT buffer back to the disc -----------------------------------------------------------------*/ bool FAT_WriteFatEntryFlushBuffer (void) { // write the buffer disc if ((fatBufferCurSector >= filesysFAT) && (fatBufferCurSector < (filesysFAT + filesysSecPerFAT))) { disc_WriteSector(fatBufferCurSector, fatBuffer); return true; } else { return false; } } #endif #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_FirstFreeCluster Internal function - gets the first available free cluster -----------------------------------------------------------------*/ u32 FAT_FirstFreeCluster(void) { // Start at first valid cluster if (fatFirstFree < CLUSTER_FIRST) fatFirstFree = CLUSTER_FIRST; while ((FAT_NextCluster(fatFirstFree) != CLUSTER_FREE) && (fatFirstFree <= fatLastCluster)) { fatFirstFree++; } if (fatFirstFree > fatLastCluster) { return CLUSTER_EOF; } return fatFirstFree; } #endif #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_LinkFreeCluster Internal function - gets the first available free cluster, sets it to end of file, links the input cluster to it then returns the cluster number -----------------------------------------------------------------*/ u32 FAT_LinkFreeCluster(u32 cluster) { u32 firstFree; u32 curLink; if (cluster > fatLastCluster) { return CLUSTER_FREE; } // Check if the cluster already has a link, and return it if so curLink = FAT_NextCluster (cluster); if ((curLink >= CLUSTER_FIRST) && (curLink < fatLastCluster)) { return curLink; // Return the current link - don't allocate a new one } // Get a free cluster firstFree = FAT_FirstFreeCluster(); // If couldn't get a free cluster then return if (firstFree == CLUSTER_EOF) { return CLUSTER_FREE; } if ((cluster >= CLUSTER_FIRST) && (cluster < fatLastCluster)) { // Update the linked from FAT entry FAT_WriteFatEntry (cluster, firstFree); } // Create the linked to FAT entry FAT_WriteFatEntry (firstFree, CLUSTER_EOF); return firstFree; } #endif #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_ClearLinks Internal function - frees any cluster used by a file -----------------------------------------------------------------*/ bool FAT_ClearLinks (u32 cluster) { u32 nextCluster; if ((cluster < 0x0002) || (cluster > fatLastCluster)) return false; // Store next cluster before erasing the link nextCluster = FAT_NextCluster (cluster); // Erase the link FAT_WriteFatEntry (cluster, CLUSTER_FREE); // Move onto next cluster cluster = nextCluster; while ((cluster != CLUSTER_EOF) && (cluster != CLUSTER_FREE)) { cluster = FAT_ReadWriteFatEntryBuffered (cluster, CLUSTER_FREE); } // Flush fat write buffer FAT_WriteFatEntryFlushBuffer (); return true; } #endif /*----------------------------------------------------------------- FAT_InitFiles Reads the FAT information from the CF card. You need to call this before reading any files. bool return OUT: true if successful. -----------------------------------------------------------------*/ bool FAT_InitFiles (void) { int i; int bootSector; BOOT_SEC* bootSec; if (!disc_Init()) { return (false); } // Read first sector of CF card if ( !disc_ReadSector(0, globalBuffer)) { return false; } // Make sure it is a valid MBR or boot sector /* if ( (globalBuffer[0x1FE] != 0x55) || (globalBuffer[0x1FF] != 0xAA)) { return false; }*/ // Check if there is a FAT string, which indicates this is a boot sector if ((globalBuffer[0x36] == 'F') && (globalBuffer[0x37] == 'A') && (globalBuffer[0x38] == 'T')) { bootSector = 0; } // Check for FAT32 else if ((globalBuffer[0x52] == 'F') && (globalBuffer[0x53] == 'A') && (globalBuffer[0x54] == 'T')) { bootSector = 0; } else // This is an MBR { // Find first valid partition from MBR // First check for an active partition for (i=0x1BE; (i < 0x1FE) && (globalBuffer[i] != 0x80); i+= 0x10); // If it didn't find an active partition, search for any valid partition if (i == 0x1FE) for (i=0x1BE; (i < 0x1FE) && (globalBuffer[i+0x04] == 0x00); i+= 0x10); // Go to first valid partition if ( i != 0x1FE) // Make sure it found a partition { bootSector = globalBuffer[0x8 + i] + (globalBuffer[0x9 + i] << 8) + (globalBuffer[0xA + i] << 16) + ((globalBuffer[0xB + i] << 24) & 0x0F); } else { bootSector = 0; // No partition found, assume this is a MBR free disk } } // Read in boot sector bootSec = (BOOT_SEC*) globalBuffer; if (!disc_ReadSector (bootSector, bootSec)) { return false; } // Store required information about the file system if (bootSec->sectorsPerFAT != 0) { filesysSecPerFAT = bootSec->sectorsPerFAT; } else { filesysSecPerFAT = bootSec->extBlock.fat32.sectorsPerFAT32; } if (bootSec->numSectorsSmall != 0) { filesysNumSec = bootSec->numSectorsSmall; } else { filesysNumSec = bootSec->numSectors; } filesysBytePerSec = BYTE_PER_READ; // Sector size is redefined to be 512 bytes filesysSecPerClus = bootSec->sectorsPerCluster * bootSec->bytesPerSector / BYTE_PER_READ; filesysBytePerClus = filesysBytePerSec * filesysSecPerClus; filesysFAT = bootSector + bootSec->reservedSectors; filesysRootDir = filesysFAT + (bootSec->numFATs * filesysSecPerFAT); filesysData = filesysRootDir + ((bootSec->rootEntries * sizeof(DIR_ENT)) / filesysBytePerSec); filesysTotalSize = (filesysNumSec - filesysData) * filesysBytePerSec; // Store info about FAT fatLastCluster = (filesysNumSec - filesysData) / bootSec->sectorsPerCluster; fatFirstFree = CLUSTER_FIRST; fatBufferCurSector = 0; disc_ReadSector(fatBufferCurSector, fatBuffer); if (fatLastCluster < 4085) { filesysType = FS_FAT12; // FAT12 volume - unsupported } else if (fatLastCluster < 65525) { filesysType = FS_FAT16; // FAT16 volume } else { filesysType = FS_FAT32; // FAT32 volume } if (filesysType != FS_FAT32) { filesysRootDirClus = FAT16_ROOT_DIR_CLUSTER; } else // Set up for the FAT32 way { filesysRootDirClus = bootSec->extBlock.fat32.rootClus; // Check if FAT mirroring is enabled if (!(bootSec->extBlock.fat32.extFlags & 0x80)) { // Use the active FAT filesysFAT = filesysFAT + ( filesysSecPerFAT * (bootSec->extBlock.fat32.extFlags & 0x0F)); } } // Set current directory to the root curWorkDirCluster = filesysRootDirClus; wrkDirCluster = filesysRootDirClus; wrkDirSector = 0; wrkDirOffset = 0; // Set all files to free for (i=0; i < MAX_FILES_OPEN; i++) { openFiles[i].inUse = false; } // No long filenames so far lfnExists = false; for (i = 0; i < MAX_FILENAME_LENGTH; i++) { lfnName[i] = '\0'; } return (true); } /*----------------------------------------------------------------- FAT_FreeFiles Closes all open files then resets the CF card. Call this before exiting back to the GBAMP bool return OUT: true if successful. -----------------------------------------------------------------*/ bool FAT_FreeFiles (void) { int i; // Close all open files for (i=0; i < MAX_FILES_OPEN; i++) { if (openFiles[i].inUse == true) { FAT_fclose(&openFiles[i]); } } // Flush any sectors in disc cache disc_CacheFlush(); // Clear card status disc_ClearStatus(); // Return status of card return disc_IsInserted(); } /*----------------------------------------------------------------- FAT_GetDirEntry Return the file info structure of the next valid file entry u32 dirCluster: IN cluster of subdirectory table int entry: IN the desired file entry int origin IN: relative position of the entry DIR_ENT return OUT: desired dirEntry. First char will be FILE_FREE if the entry does not exist. -----------------------------------------------------------------*/ DIR_ENT FAT_GetDirEntry ( u32 dirCluster, int entry, int origin) { DIR_ENT dir; DIR_ENT_LFN lfn; int firstSector = 0; bool notFound = false; bool found = false; int maxSectors; int lfnPos, aliasPos; u8 lfnChkSum, chkSum; int i; dir.name[0] = FILE_FREE; // default to no file found dir.attrib = 0x00; // Check if fat has been initialised if (filesysBytePerSec == 0) { return (dir); } switch (origin) { case SEEK_SET: wrkDirCluster = dirCluster; wrkDirSector = 0; wrkDirOffset = -1; break; case SEEK_CUR: // Don't change anything break; case SEEK_END: // Find entry signifying end of directory // Subtraction will never reach 0, so it keeps going // until reaches end of directory wrkDirCluster = dirCluster; wrkDirSector = 0; wrkDirOffset = -1; entry = -1; break; default: return dir; } lfnChkSum = 0; maxSectors = (wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? (filesysData - filesysRootDir) : filesysSecPerClus); // Scan Dir for correct entry firstSector = (wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)); disc_ReadSector (firstSector + wrkDirSector, globalBuffer); found = false; notFound = false; do { wrkDirOffset++; if (wrkDirOffset == BYTE_PER_READ / sizeof (DIR_ENT)) { wrkDirOffset = 0; wrkDirSector++; if ((wrkDirSector == filesysSecPerClus) && (wrkDirCluster != FAT16_ROOT_DIR_CLUSTER)) { wrkDirSector = 0; wrkDirCluster = FAT_NextCluster(wrkDirCluster); if (wrkDirCluster == CLUSTER_EOF) { notFound = true; } firstSector = FAT_ClustToSect(wrkDirCluster); } else if ((wrkDirCluster == FAT16_ROOT_DIR_CLUSTER) && (wrkDirSector == (filesysData - filesysRootDir))) { notFound = true; // Got to end of root dir } disc_ReadSector (firstSector + wrkDirSector, globalBuffer); } dir = ((DIR_ENT*) globalBuffer)[wrkDirOffset]; if ((dir.name[0] != FILE_FREE) && (dir.name[0] > 0x20) && ((dir.attrib & ATTRIB_VOL) != ATTRIB_VOL)) { entry--; if (lfnExists) { // Calculate file checksum chkSum = 0; for (aliasPos=0; aliasPos < 11; aliasPos++) { // NOTE: The operation is an unsigned char rotate right chkSum = ((chkSum & 1) ? 0x80 : 0) + (chkSum >> 1) + (aliasPos < 8 ? dir.name[aliasPos] : dir.ext[aliasPos - 8]); } if (chkSum != lfnChkSum) { lfnExists = false; lfnName[0] = '\0'; } } if (entry == 0) { if (!lfnExists) { FAT_GetFilename (dir, lfnName); } found = true; } } else if (dir.name[0] == FILE_LAST) { if (origin == SEEK_END) { found = true; } else { notFound = true; } } else if (dir.attrib == ATTRIB_LFN) { lfn = ((DIR_ENT_LFN*) globalBuffer)[wrkDirOffset]; if (lfn.ordinal & LFN_DEL) { lfnExists = false; } else if (lfn.ordinal & LFN_END) // Last part of LFN, make sure it isn't deleted (Thanks MoonLight) { lfnExists = true; lfnName[(lfn.ordinal & ~LFN_END) * 13] = '\0'; // Set end of lfn to null character lfnChkSum = lfn.checkSum; } if (lfnChkSum != lfn.checkSum) { lfnExists = false; } if (lfnExists) { lfnPos = ((lfn.ordinal & ~LFN_END) - 1) * 13; for (i = 0; i < 13; i++) { lfnName[lfnPos + i] = ((u8*)&lfn)[(int)(lfn_offset_table[i])] /* | ((u8*)&lfn)[(int)(lfn_offset_table[i]) + 1] include this for unicode support*/; } } } } while (!found && !notFound); // If no file is found, return FILE_FREE if (notFound) { dir.name[0] = FILE_FREE; } return (dir); } /*----------------------------------------------------------------- FAT_GetLongFilename Get the long name of the last file or directory retrived with GetDirEntry. Also works for FindFirstFile and FindNextFile. If a long name doesn't exist, it returns the short name instead. char* filename: OUT will be filled with the filename, should be at least 256 bytes long bool return OUT: return true if successful -----------------------------------------------------------------*/ bool FAT_GetLongFilename (char* filename) { if (filename == NULL) return false; strncpy (filename, lfnName, MAX_FILENAME_LENGTH - 1); filename[MAX_FILENAME_LENGTH - 1] = '\0'; return true; } /*----------------------------------------------------------------- FAT_GetFilename Get the alias (short name) of the file or directory stored in dirEntry DIR_ENT dirEntry: IN a valid directory table entry char* alias OUT: will be filled with the alias (short filename), should be at least 13 bytes long bool return OUT: return true if successful -----------------------------------------------------------------*/ bool FAT_GetFilename (DIR_ENT dirEntry, char* alias) { int i=0; int j=0; alias[0] = '\0'; if (dirEntry.name[0] != FILE_FREE) { if (dirEntry.name[0] == '.') { alias[0] = '.'; if (dirEntry.name[1] == '.') { alias[1] = '.'; alias[2] = '\0'; } else { alias[1] = '\0'; } } else { // Copy the filename from the dirEntry to the string for (i = 0; (i < 8) && (dirEntry.name[i] != ' '); i++) { alias[i] = dirEntry.name[i]; } // Copy the extension from the dirEntry to the string if (dirEntry.ext[0] != ' ') { alias[i++] = '.'; for ( j = 0; (j < 3) && (dirEntry.ext[j] != ' '); j++) { alias[i++] = dirEntry.ext[j]; } } alias[i] = '\0'; } } return (alias[0] != '\0'); } /*----------------------------------------------------------------- FAT_GetAlias Get the alias (short name) of the last file or directory entry read using GetDirEntry. Works for FindFirstFile and FindNextFile char* alias OUT: will be filled with the alias (short filename), should be at least 13 bytes long bool return OUT: return true if successful -----------------------------------------------------------------*/ bool FAT_GetAlias (char* alias) { if (alias == NULL) { return false; } // Read in the last accessed directory entry disc_ReadSector ((wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector, globalBuffer); return FAT_GetFilename (((DIR_ENT*)globalBuffer)[wrkDirOffset], alias); } /*----------------------------------------------------------------- FAT_GetFileSize Get the file size of the last file found or openned. This idea is based on a modification by MoonLight u32 return OUT: the file size -----------------------------------------------------------------*/ u32 FAT_GetFileSize (void) { // Read in the last accessed directory entry disc_ReadSector ((wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector, globalBuffer); return ((DIR_ENT*)globalBuffer)[wrkDirOffset].fileSize; } /*----------------------------------------------------------------- FAT_GetFileCluster Get the first cluster of the last file found or openned. u32 return OUT: the file start cluster -----------------------------------------------------------------*/ u32 FAT_GetFileCluster (void) { // Read in the last accessed directory entry disc_ReadSector ((wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector, globalBuffer); return (((DIR_ENT*)globalBuffer)[wrkDirOffset].startCluster) | (((DIR_ENT*)globalBuffer)[wrkDirOffset].startClusterHigh << 16); } /*----------------------------------------------------------------- FAT_GetFileAttributes Get the attributes of the last file found or openned. u8 return OUT: the file's attributes -----------------------------------------------------------------*/ u8 FAT_GetFileAttributes (void) { // Read in the last accessed directory entry disc_ReadSector ((wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector, globalBuffer); return ((DIR_ENT*)globalBuffer)[wrkDirOffset].attrib; } #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_SetFileAttributes Set the attributes of a file. const char* filename IN: The name and path of the file to modify u8 attributes IN: The attribute values to assign u8 mask IN: Detemines which attributes are changed u8 return OUT: the file's new attributes -----------------------------------------------------------------*/ u8 FAT_SetFileAttributes (const char* filename, u8 attributes, u8 mask) { // Get the file if (!FAT_FileExists(filename)) { return 0xff; } // Read in the last accessed directory entry disc_ReadSector ((wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector, globalBuffer); ((DIR_ENT*)globalBuffer)[wrkDirOffset].attrib = (((DIR_ENT*)globalBuffer)[wrkDirOffset].attrib & ~(mask & 0x27)) | (attributes & 0x27); // 0x27 is he settable attributes disc_WriteSector ((wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector, globalBuffer); return ((DIR_ENT*)globalBuffer)[wrkDirOffset].attrib; } #endif #ifdef FILE_TIME_SUPPORT time_t FAT_FileTimeToCTime (u16 fileTime, u16 fileDate) { struct tm timeInfo; timeInfo.tm_year = (fileDate >> 9) + 80; // years since midnight January 1970 timeInfo.tm_mon = ((fileDate >> 5) & 0xf) - 1; // Months since january timeInfo.tm_mday = fileDate & 0x1f; // Day of the month timeInfo.tm_hour = fileTime >> 11; // hours past midnight timeInfo.tm_min = (fileTime >> 5) & 0x3f; // minutes past the hour timeInfo.tm_sec = (fileTime & 0x1f) * 2; // seconds past the minute return mktime(&timeInfo); } /*----------------------------------------------------------------- FAT_GetFileCreationTime Get the creation time of the last file found or openned. time_t return OUT: the file's creation time -----------------------------------------------------------------*/ time_t FAT_GetFileCreationTime (void) { // Read in the last accessed directory entry disc_ReadSector ((wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector, globalBuffer); return FAT_FileTimeToCTime(((DIR_ENT*)globalBuffer)[wrkDirOffset].cTime, ((DIR_ENT*)globalBuffer)[wrkDirOffset].cDate); } /*----------------------------------------------------------------- FAT_GetFileLastWriteTime Get the creation time of the last file found or openned. time_t return OUT: the file's creation time -----------------------------------------------------------------*/ time_t FAT_GetFileLastWriteTime (void) { // Read in the last accessed directory entry disc_ReadSector ((wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector, globalBuffer); return FAT_FileTimeToCTime(((DIR_ENT*)globalBuffer)[wrkDirOffset].mTime, ((DIR_ENT*)globalBuffer)[wrkDirOffset].mDate); } #endif /*----------------------------------------------------------------- FAT_DirEntFromPath Finds the directory entry for a file or directory from a path Path separator is a forward slash / const char* path: IN null terminated string of path. DIR_ENT return OUT: dirEntry of found file. First char will be FILE_FREE if the file was not found -----------------------------------------------------------------*/ DIR_ENT FAT_DirEntFromPath (const char* path) { int pathPos; char name[MAX_FILENAME_LENGTH]; char alias[13]; int namePos; bool found, notFound; DIR_ENT dirEntry; u32 dirCluster; bool flagLFN, dotSeen; // Start at beginning of path pathPos = 0; #ifdef DS_BUILD_F // Problems with Kyrandia doing a load of path lookups are reduced by this hack. if (strstr(path, ".voc") || strstr(path, ".voc")) { dirEntry.name[0] = FILE_FREE; dirEntry.attrib = 0x00; return dirEntry; } #endif if (path[pathPos] == '/') { dirCluster = filesysRootDirClus; // Start at root directory } else { dirCluster = curWorkDirCluster; // Start at current working dir } // Eat any slash / while ((path[pathPos] == '/') && (path[pathPos] != '\0')) { pathPos++; } // Search until can't continue found = false; notFound = false; while (!notFound && !found) { flagLFN = false; // Copy name from path namePos = 0; if ((path[pathPos] == '.') && ((path[pathPos + 1] == '\0') || (path[pathPos + 1] == '/'))) { // Dot entry name[namePos++] = '.'; pathPos++; } else if ((path[pathPos] == '.') && (path[pathPos + 1] == '.') && ((path[pathPos + 2] == '\0') || (path[pathPos + 2] == '/'))){ // Double dot entry name[namePos++] = '.'; pathPos++; name[namePos++] = '.'; pathPos++; } else { // Copy name from path if (path[pathPos] == '.') { flagLFN = true; } dotSeen = false; while ((namePos < MAX_FILENAME_LENGTH - 1) && (path[pathPos] != '\0') && (path[pathPos] != '/')) { name[namePos] = ucase(path[pathPos]); if ((name[namePos] <= ' ') || ((name[namePos] >= ':') && (name[namePos] <= '?'))) // Invalid character { flagLFN = true; } if (name[namePos] == '.') { if (!dotSeen) { dotSeen = true; } else { flagLFN = true; } } namePos++; pathPos++; } // Check if a long filename was specified if (namePos > 12) { flagLFN = true; } } // Add end of string char name[namePos] = '\0'; // Move through path to correct place while ((path[pathPos] != '/') && (path[pathPos] != '\0')) pathPos++; // Eat any slash / while ((path[pathPos] == '/') && (path[pathPos] != '\0')) { pathPos++; } // Search current Dir for correct entry dirEntry = FAT_GetDirEntry (dirCluster, 1, SEEK_SET); while ( !found && !notFound) { // Match filename found = true; for (namePos = 0; (namePos < MAX_FILENAME_LENGTH) && found && (name[namePos] != '\0') && (lfnName[namePos] != '\0'); namePos++) { if (name[namePos] != ucase(lfnName[namePos])) { found = false; } } if ((name[namePos] == '\0') != (lfnName[namePos] == '\0')) { found = false; } // Check against alias as well. if (!found) { FAT_GetFilename(dirEntry, alias); found = true; for (namePos = 0; (namePos < 13) && found && (name[namePos] != '\0') && (alias[namePos] != '\0'); namePos++) { if (name[namePos] != ucase(alias[namePos])) { found = false; } } if ((name[namePos] == '\0') != (alias[namePos] == '\0')) { found = false; } } if (dirEntry.name[0] == FILE_FREE) // Couldn't find specified file { found = false; notFound = true; } if (!found && !notFound) { dirEntry = FAT_GetDirEntry (dirCluster, 1, SEEK_CUR); } } if (found && ((dirEntry.attrib & ATTRIB_DIR) == ATTRIB_DIR) && (path[pathPos] != '\0')) // It has found a directory from within the path that needs to be followed { found = false; dirCluster = dirEntry.startCluster | (dirEntry.startClusterHigh << 16); } } if (notFound) { dirEntry.name[0] = FILE_FREE; dirEntry.attrib = 0x00; } return (dirEntry); } #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_AddDirEntry Creates a new dir entry for a file Path separator is a forward slash / const char* path: IN null terminated string of path to file. DIR_ENT newDirEntry IN: The directory entry to use. int file IN: The file being added (optional, use -1 if not used) bool return OUT: true if successful -----------------------------------------------------------------*/ bool FAT_AddDirEntry (const char* path, DIR_ENT newDirEntry) { char filename[MAX_FILENAME_LENGTH]; int filePos, pathPos, aliasPos; char tempChar; bool flagLFN, dotSeen; char fileAlias[13] = {0}; int tailNum; unsigned char chkSum = 0; u32 oldWorkDirCluster; DIR_ENT* dirEntries = (DIR_ENT*)globalBuffer; u32 dirCluster; int secOffset; int entryOffset; int maxSectors; u32 firstSector; DIR_ENT_LFN lfnEntry; int lfnPos = 0; int dirEntryLength = 0; int dirEntryRemain = 0; u32 tempDirCluster; int tempSecOffset; int tempEntryOffset; bool dirEndFlag = false; int i; // Store current working directory oldWorkDirCluster = curWorkDirCluster; // Find filename within path and change to correct directory if (path[0] == '/') { curWorkDirCluster = filesysRootDirClus; } pathPos = 0; filePos = 0; flagLFN = false; while (path[pathPos + filePos] != '\0') { if (path[pathPos + filePos] == '/') { filename[filePos] = '\0'; if (FAT_chdir(filename) == false) { curWorkDirCluster = oldWorkDirCluster; return false; // Couldn't change directory } pathPos += filePos + 1; filePos = 0; } filename[filePos] = path[pathPos + filePos]; filePos++; } // Skip over last slashes while (path[pathPos] == '/') pathPos++; // Check if the filename has a leading "." // If so, it is an LFN if (path[pathPos] == '.') { flagLFN = true; } // Copy name from path filePos = 0; dotSeen = false; while ((filePos < MAX_FILENAME_LENGTH - 1) && (path[pathPos] != '\0')) { filename[filePos] = path[pathPos]; if ((filename[filePos] <= ' ') || ((filename[filePos] >= ':') && (filename[filePos] <= '?'))) // Invalid character { flagLFN = true; } if (filename[filePos] == '.') { if (!dotSeen) { dotSeen = true; } else { flagLFN = true; } } filePos++; pathPos++; if ((filePos > 8) && !dotSeen) { flagLFN = true; } } if (filePos == 0) // No filename { return false; } // Check if a long filename was specified if (filePos > 12) { flagLFN = true; } // Check if extension is > 3 characters long if (!flagLFN && (strrchr (filename, '.') != NULL) && (strlen(strrchr(filename, '.')) > 4)) { flagLFN = true; } lfnPos = (filePos - 1) / 13; // Add end of string char filename[filePos++] = '\0'; // Clear remaining chars while (filePos < MAX_FILENAME_LENGTH) filename[filePos++] = 0x01; // Set for LFN compatibility if (flagLFN) { // Generate short filename - always a 2 digit number for tail // Get first 5 chars of alias from LFN aliasPos = 0; filePos = 0; if (filename[filePos] == '.') { filePos++; } for ( ; (aliasPos < 5) && (filename[filePos] != '\0') && (filename[filePos] != '.') ; filePos++) { tempChar = ucase(filename[filePos]); if (((tempChar > ' ' && tempChar < ':') || tempChar > '?') && tempChar != '.') fileAlias[aliasPos++] = tempChar; } // Pad Alias with underscores while (aliasPos < 5) fileAlias[aliasPos++] = '_'; fileAlias[5] = '~'; fileAlias[8] = '.'; fileAlias[9] = ' '; fileAlias[10] = ' '; fileAlias[11] = ' '; if (strchr (filename, '.') != NULL) { while(filename[filePos] != '\0') { filePos++; if (filename[filePos] == '.') { pathPos = filePos; } } filePos = pathPos + 1; //pathPos is used as a temporary variable // Copy first 3 characters of extension for (aliasPos = 9; (aliasPos < 12) && (filename[filePos] != '\0'); filePos++) { tempChar = ucase(filename[filePos]); if ((tempChar > ' ' && tempChar < ':') || tempChar > '?') fileAlias[aliasPos++] = tempChar; } } else { aliasPos = 9; } // Pad Alias extension with spaces while (aliasPos < 12) fileAlias[aliasPos++] = ' '; fileAlias[12] = '\0'; // Get a valid tail number tailNum = 0; do { tailNum++; fileAlias[6] = 0x30 + ((tailNum / 10) % 10); // 10's digit fileAlias[7] = 0x30 + (tailNum % 10); // 1's digit } while ((FAT_DirEntFromPath(fileAlias).name[0] != FILE_FREE) && (tailNum < 100)); if (tailNum < 100) // Found an alias not being used { // Calculate file checksum chkSum = 0; for (aliasPos=0; aliasPos < 12; aliasPos++) { // Skip '.' if (fileAlias[aliasPos] == '.') aliasPos++; // NOTE: The operation is an unsigned char rotate right chkSum = ((chkSum & 1) ? 0x80 : 0) + (chkSum >> 1) + fileAlias[aliasPos]; } } else // Couldn't find a valid alias { return false; } dirEntryLength = lfnPos + 2; } else // Its not a long file name { // Just copy alias straight from filename for (aliasPos = 0; aliasPos < 13; aliasPos++) { tempChar = ucase(filename[aliasPos]); if ((tempChar > ' ' && tempChar < ':') || tempChar > '?') fileAlias[aliasPos] = tempChar; } fileAlias[12] = '\0'; lfnPos = -1; dirEntryLength = 1; } // Change dirEntry name to match alias for (aliasPos = 0; ((fileAlias[aliasPos] != '.') && (fileAlias[aliasPos] != '\0') && (aliasPos < 8)); aliasPos++) { newDirEntry.name[aliasPos] = fileAlias[aliasPos]; } while (aliasPos < 8) { newDirEntry.name[aliasPos++] = ' '; } aliasPos = 0; while ((fileAlias[aliasPos] != '.') && (fileAlias[aliasPos] != '\0')) aliasPos++; filePos = 0; while (( filePos < 3 ) && (fileAlias[aliasPos] != '\0')) { tempChar = fileAlias[aliasPos++]; if ((tempChar > ' ' && tempChar < ':' && tempChar!='.') || tempChar > '?') newDirEntry.ext[filePos++] = tempChar; } while (filePos < 3) { newDirEntry.ext[filePos++] = ' '; } // Scan Dir for free entry dirCluster = curWorkDirCluster; secOffset = 0; entryOffset = 0; maxSectors = (dirCluster == FAT16_ROOT_DIR_CLUSTER ? (filesysData - filesysRootDir) : filesysSecPerClus); firstSector = (dirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(dirCluster)); disc_ReadSector (firstSector + secOffset, dirEntries); dirEntryRemain = dirEntryLength; tempDirCluster = dirCluster; tempSecOffset = secOffset; tempEntryOffset = entryOffset; // Search for a large enough space to fit in new directory entry while ((dirEntries[entryOffset].name[0] != FILE_LAST) && (dirEntryRemain > 0)) { entryOffset++; if (entryOffset == BYTE_PER_READ / sizeof (DIR_ENT)) { entryOffset = 0; secOffset++; if ((secOffset == filesysSecPerClus) && (dirCluster != FAT16_ROOT_DIR_CLUSTER)) { secOffset = 0; if (FAT_NextCluster(dirCluster) == CLUSTER_EOF) { dirCluster = FAT_LinkFreeCluster(dirCluster); dirEntries[0].name[0] = FILE_LAST; } else { dirCluster = FAT_NextCluster(dirCluster); } firstSector = FAT_ClustToSect(dirCluster); } else if ((dirCluster == FAT16_ROOT_DIR_CLUSTER) && (secOffset == (filesysData - filesysRootDir))) { return false; // Got to end of root dir - can't fit in more files } disc_ReadSector (firstSector + secOffset, dirEntries); } if ((dirEntries[entryOffset].name[0] == FILE_FREE) || (dirEntries[entryOffset].name[0] == FILE_LAST) ) { dirEntryRemain--; } else { dirEntryRemain = dirEntryLength; tempDirCluster = dirCluster; tempSecOffset = secOffset; tempEntryOffset = entryOffset; } } // Modifying the last directory is a special case - have to erase following entries if (dirEntries[entryOffset].name[0] == FILE_LAST) { dirEndFlag = true; } // Recall last used entry dirCluster = tempDirCluster; secOffset = tempSecOffset; entryOffset = tempEntryOffset; dirEntryRemain = dirEntryLength; // Re-read in first sector that will be written to if (dirEndFlag && (entryOffset == 0)) { memset (dirEntries, FILE_LAST, BYTE_PER_READ); } else { disc_ReadSector (firstSector + secOffset, dirEntries); } // Add new directory entry while (dirEntryRemain > 0) { // Move to next entry, first pass advances from last used entry entryOffset++; if (entryOffset == BYTE_PER_READ / sizeof (DIR_ENT)) { // Write out the current sector if we need to entryOffset = 0; if (dirEntryRemain < dirEntryLength) // Don't write out sector on first pass { disc_WriteSector (firstSector + secOffset, dirEntries); } secOffset++; if ((secOffset == filesysSecPerClus) && (dirCluster != FAT16_ROOT_DIR_CLUSTER)) { secOffset = 0; if (FAT_NextCluster(dirCluster) == CLUSTER_EOF) { dirCluster = FAT_LinkFreeCluster(dirCluster); dirEntries[0].name[0] = FILE_LAST; } else { dirCluster = FAT_NextCluster(dirCluster); } firstSector = FAT_ClustToSect(dirCluster); } else if ((dirCluster == FAT16_ROOT_DIR_CLUSTER) && (secOffset == (filesysData - filesysRootDir))) { return false; // Got to end of root dir - can't fit in more files } if (dirEndFlag) { memset (dirEntries, FILE_LAST, BYTE_PER_READ); } else { disc_ReadSector (firstSector + secOffset, dirEntries); } } // Generate LFN entries if (lfnPos >= 0) { lfnEntry.ordinal = (lfnPos + 1) | (dirEntryRemain == dirEntryLength ? LFN_END : 0); for (i = 0; i < 13; i++) { if (filename [lfnPos * 13 + i] == 0x01) { ((u8*)&lfnEntry)[(int)lfn_offset_table[i]] = 0xff; ((u8*)&lfnEntry)[(int)(lfn_offset_table[i]) + 1] = 0xff; } else { ((u8*)&lfnEntry)[(int)lfn_offset_table[i]] = filename [lfnPos * 13 + i]; ((u8*)&lfnEntry)[(int)(lfn_offset_table[i]) + 1] = 0x00; } } lfnEntry.checkSum = chkSum; lfnEntry.flag = ATTRIB_LFN; lfnEntry.reserved1 = 0; lfnEntry.reserved2 = 0; *((DIR_ENT_LFN*)&dirEntries[entryOffset]) = lfnEntry; lfnPos --; lfnEntry.ordinal = 0; } // end writing long filename entries else { dirEntries[entryOffset] = newDirEntry; if (dirEndFlag && (entryOffset < (BYTE_PER_READ / sizeof (DIR_ENT))) ) dirEntries[entryOffset+1].name[0] = FILE_LAST; } dirEntryRemain--; } // Write directory back to disk disc_WriteSector (firstSector + secOffset, dirEntries); // Change back to Working DIR curWorkDirCluster = oldWorkDirCluster; return true; } #endif /*----------------------------------------------------------------- FAT_FindNextFile Gets the name of the next directory entry (can be a file or subdirectory) char* filename: OUT filename, must be at least 13 chars long FILE_TYPE return: OUT returns FT_NONE if failed, FT_FILE if it found a file and FT_DIR if it found a directory -----------------------------------------------------------------*/ FILE_TYPE FAT_FindNextFile(char* filename) { // Get the next directory entry DIR_ENT file; file = FAT_GetDirEntry (curWorkDirCluster, 1, SEEK_CUR); if (file.name[0] == FILE_FREE) { return FT_NONE; // Did not find a file } // Get the filename if (filename != NULL) FAT_GetFilename (file, filename); if ((file.attrib & ATTRIB_DIR) != 0) { return FT_DIR; // Found a directory } else { return FT_FILE; // Found a file } } /*----------------------------------------------------------------- FAT_FindFirstFile Gets the name of the first directory entry and resets the count (can be a file or subdirectory) char* filename: OUT filename, must be at least 13 chars long FILE_TYPE return: OUT returns FT_NONE if failed, FT_FILE if it found a file and FT_DIR if it found a directory -----------------------------------------------------------------*/ FILE_TYPE FAT_FindFirstFile(char* filename) { // Get the first directory entry DIR_ENT file; file = FAT_GetDirEntry (curWorkDirCluster, 1, SEEK_SET); if (file.name[0] == FILE_FREE) { return FT_NONE; // Did not find a file } // Get the filename if (filename != NULL) FAT_GetFilename (file, filename); if ((file.attrib & ATTRIB_DIR) != 0) { return FT_DIR; // Found a directory } else { return FT_FILE; // Found a file } } /*----------------------------------------------------------------- FAT_FindFirstFileLFN Gets the long file name of the first directory entry and resets the count (can be a file or subdirectory) char* lfn: OUT long file name, must be at least 256 chars long FILE_TYPE return: OUT returns FT_NONE if failed, FT_FILE if it found a file and FT_DIR if it found a directory -----------------------------------------------------------------*/ FILE_TYPE FAT_FindFirstFileLFN(char* lfn) { FILE_TYPE type; type = FAT_FindFirstFile(NULL); FAT_GetLongFilename (lfn); return type; } /*----------------------------------------------------------------- FAT_FindNextFileLFN Gets the long file name of the next directory entry (can be a file or subdirectory) char* lfn: OUT long file name, must be at least 256 chars long FILE_TYPE return: OUT returns FT_NONE if failed, FT_FILE if it found a file and FT_DIR if it found a directory -----------------------------------------------------------------*/ FILE_TYPE FAT_FindNextFileLFN(char* lfn) { FILE_TYPE type; type = FAT_FindNextFile(NULL); FAT_GetLongFilename (lfn); return type; } /*----------------------------------------------------------------- FAT_FileExists Returns the type of file char* filename: IN filename of the file to look for FILE_TYPE return: OUT returns FT_NONE if there is now file with that name, FT_FILE if it is a file and FT_DIR if it is a directory -----------------------------------------------------------------*/ FILE_TYPE FAT_FileExists(const char* filename) { DIR_ENT dirEntry; // Get the dirEntry for the path specified dirEntry = FAT_DirEntFromPath (filename); if (dirEntry.name[0] == FILE_FREE) { return FT_NONE; } else if (dirEntry.attrib & ATTRIB_DIR) { return FT_DIR; } else { return FT_FILE; } } /*----------------------------------------------------------------- FAT_GetFileSystemType FS_TYPE return: OUT returns the current file system type -----------------------------------------------------------------*/ FS_TYPE FAT_GetFileSystemType (void) { return filesysType; } /*----------------------------------------------------------------- FAT_GetFileSystemTotalSize u32 return: OUT returns the total disk space (used + free) -----------------------------------------------------------------*/ u32 FAT_GetFileSystemTotalSize (void) { return filesysTotalSize; } /*----------------------------------------------------------------- FAT_chdir Changes the current working directory const char* path: IN null terminated string of directory separated by forward slashes, / is root bool return: OUT returns true if successful -----------------------------------------------------------------*/ bool FAT_chdir (const char* path) { DIR_ENT dir; if (path[0] == '/' && path[1] == '\0') { curWorkDirCluster = filesysRootDirClus; return true; } if (path[0] == '\0') // Return true if changing relative to nothing { return true; } dir = FAT_DirEntFromPath (path); if (((dir.attrib & ATTRIB_DIR) == ATTRIB_DIR) && (dir.name[0] != FILE_FREE)) { // Change directory curWorkDirCluster = dir.startCluster | (dir.startClusterHigh << 16); // Move to correct cluster for root directory if (curWorkDirCluster == FAT16_ROOT_DIR_CLUSTER) { curWorkDirCluster = filesysRootDirClus; } // Reset file position in directory wrkDirCluster = curWorkDirCluster; wrkDirSector = 0; wrkDirOffset = -1; return true; } else { // Couldn't change directory - wrong path specified return false; } } /*----------------------------------------------------------------- FAT_fopen(filename, mode) Opens a file const char* path: IN null terminated string of filename and path separated by forward slashes, / is root const char* mode: IN mode to open file in Supported modes: "r", "r+", "w", "w+", "a", "a+", don't use "b" or "t" in any mode, as all files are openned in binary mode FAT_FILE* return: OUT handle to open file, returns NULL if the file couldn't be openned -----------------------------------------------------------------*/ FAT_FILE* FAT_fopen(const char* path, const char* mode) { int fileNum; FAT_FILE* file; DIR_ENT dirEntry; #ifdef CAN_WRITE_TO_DISC u32 startCluster; int clusCount; #endif char* pchTemp; // Check that a valid mode was specified pchTemp = strpbrk ( mode, "rRwWaA" ); if (pchTemp == NULL) { return NULL; } if (strpbrk ( pchTemp+1, "rRwWaA" ) != NULL) { return NULL; } // Get the dirEntry for the path specified dirEntry = FAT_DirEntFromPath (path); // Check that it is not a directory if (dirEntry.attrib & ATTRIB_DIR) { return NULL; } #ifdef CAN_WRITE_TO_DISC // Check that it is not a read only file being openned in a writing mode if ( (strpbrk(mode, "wWaA+") != NULL) && (dirEntry.attrib & ATTRIB_RO)) { return NULL; } #else if ( (strpbrk(mode, "wWaA+") != NULL)) { return NULL; } #endif // Find a free file buffer for (fileNum = 0; (fileNum < MAX_FILES_OPEN) && (openFiles[fileNum].inUse == true); fileNum++); if (fileNum == MAX_FILES_OPEN) // No free files { return NULL; } file = &openFiles[fileNum]; // Remember where directory entry was file->dirEntSector = (wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector; file->dirEntOffset = wrkDirOffset; if ( strpbrk(mode, "rR") != NULL ) //(ucase(mode[0]) == 'R') { if (dirEntry.name[0] == FILE_FREE) // File must exist { return NULL; } file->read = true; #ifdef CAN_WRITE_TO_DISC file->write = ( strchr(mode, '+') != NULL ); //(mode[1] == '+'); #else file->write = false; #endif file->append = false; // Store information about position within the file, for use // by FAT_fread, FAT_fseek, etc. file->firstCluster = dirEntry.startCluster | (dirEntry.startClusterHigh << 16); #ifdef CAN_WRITE_TO_DISC // Check if file is openned for random. If it is, and currently has no cluster, one must be // assigned to it. if (file->write && file->firstCluster == CLUSTER_FREE) { file->firstCluster = FAT_LinkFreeCluster (CLUSTER_FREE); if (file->firstCluster == CLUSTER_FREE) // Couldn't get a free cluster { return NULL; } // Store cluster position into the directory entry dirEntry.startCluster = (file->firstCluster & 0xFFFF); dirEntry.startClusterHigh = ((file->firstCluster >> 16) & 0xFFFF); disc_ReadSector (file->dirEntSector, globalBuffer); ((DIR_ENT*) globalBuffer)[file->dirEntOffset] = dirEntry; disc_WriteSector (file->dirEntSector, globalBuffer); } #endif file->length = dirEntry.fileSize; file->curPos = 0; file->curClus = dirEntry.startCluster | (dirEntry.startClusterHigh << 16); file->curSect = 0; file->curByte = 0; // Not appending file->appByte = 0; file->appClus = 0; file->appSect = 0; disc_ReadSector( FAT_ClustToSect( file->curClus), file->readBuffer); file->inUse = true; // We're using this file now return file; } // mode "r" #ifdef CAN_WRITE_TO_DISC if ( strpbrk(mode, "wW") != NULL ) // (ucase(mode[0]) == 'W') { if (dirEntry.name[0] == FILE_FREE) // Create file if it doesn't exist { dirEntry.attrib = ATTRIB_ARCH; dirEntry.reserved = 0; // Time and date set to system time and date dirEntry.cTime_ms = 0; dirEntry.cTime = getRTCtoFileTime(); dirEntry.cDate = getRTCtoFileDate(); dirEntry.aDate = getRTCtoFileDate(); dirEntry.mTime = getRTCtoFileTime(); dirEntry.mDate = getRTCtoFileDate(); } else // Already a file entry { // Free any clusters used FAT_ClearLinks (dirEntry.startCluster | (dirEntry.startClusterHigh << 16)); } // Get a cluster to use startCluster = FAT_LinkFreeCluster (CLUSTER_FREE); if (startCluster == CLUSTER_FREE) // Couldn't get a free cluster { return NULL; } // Store cluster position into the directory entry dirEntry.startCluster = (startCluster & 0xFFFF); dirEntry.startClusterHigh = ((startCluster >> 16) & 0xFFFF); // The file has no data in it - its over written so should be empty dirEntry.fileSize = 0; if (dirEntry.name[0] == FILE_FREE) // No file { // Have to create a new entry if(!FAT_AddDirEntry (path, dirEntry)) { return NULL; } // Get the newly created dirEntry dirEntry = FAT_DirEntFromPath (path); // Remember where directory entry was file->dirEntSector = (wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector; file->dirEntOffset = wrkDirOffset; } else // Already a file { // Just modify the old entry disc_ReadSector (file->dirEntSector, globalBuffer); ((DIR_ENT*) globalBuffer)[file->dirEntOffset] = dirEntry; disc_WriteSector (file->dirEntSector, globalBuffer); } // Now that file is created, open it file->read = ( strchr(mode, '+') != NULL ); //(mode[1] == '+'); file->write = true; file->append = false; // Store information about position within the file, for use // by FAT_fread, FAT_fseek, etc. file->firstCluster = startCluster; file->length = 0; // Should always have 0 bytes if openning in "w" mode file->curPos = 0; file->curClus = startCluster; file->curSect = 0; file->curByte = 0; // Not appending file->appByte = 0; file->appClus = 0; file->appSect = 0; // Empty file, so empty read buffer memset (file->readBuffer, 0, BYTE_PER_READ); file->inUse = true; // We're using this file now return file; } if ( strpbrk(mode, "aA") != NULL ) // (ucase(mode[0]) == 'A') { if (dirEntry.name[0] == FILE_FREE) // Create file if it doesn't exist { dirEntry.attrib = ATTRIB_ARCH; dirEntry.reserved = 0; // Time and date set to system time and date dirEntry.cTime_ms = 0; dirEntry.cTime = getRTCtoFileTime(); dirEntry.cDate = getRTCtoFileDate(); dirEntry.aDate = getRTCtoFileDate(); dirEntry.mTime = getRTCtoFileTime(); dirEntry.mDate = getRTCtoFileDate(); // The file has no data in it dirEntry.fileSize = 0; // Get a cluster to use startCluster = FAT_LinkFreeCluster (CLUSTER_FREE); if (startCluster == CLUSTER_FREE) // Couldn't get a free cluster { return NULL; } dirEntry.startCluster = (startCluster & 0xFFFF); dirEntry.startClusterHigh = ((startCluster >> 16) & 0xFFFF); if(!FAT_AddDirEntry (path, dirEntry)) return NULL; // Get the newly created dirEntry dirEntry = FAT_DirEntFromPath (path); // Store append cluster file->appClus = startCluster; // Remember where directory entry was file->dirEntSector = (wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector; file->dirEntOffset = wrkDirOffset; } else // File already exists - reuse the old directory entry { startCluster = dirEntry.startCluster | (dirEntry.startClusterHigh << 16); // If it currently has no cluster, one must be assigned to it. if (startCluster == CLUSTER_FREE) { file->firstCluster = FAT_LinkFreeCluster (CLUSTER_FREE); if (file->firstCluster == CLUSTER_FREE) // Couldn't get a free cluster { return NULL; } // Store cluster position into the directory entry dirEntry.startCluster = (file->firstCluster & 0xFFFF); dirEntry.startClusterHigh = ((file->firstCluster >> 16) & 0xFFFF); disc_ReadSector (file->dirEntSector, globalBuffer); ((DIR_ENT*) globalBuffer)[file->dirEntOffset] = dirEntry; disc_WriteSector (file->dirEntSector, globalBuffer); // Store append cluster file->appClus = startCluster; } else { // Follow cluster list until last one is found clusCount = dirEntry.fileSize / filesysBytePerClus; file->appClus = startCluster; while ((clusCount--) && (FAT_NextCluster (file->appClus) != CLUSTER_FREE) && (FAT_NextCluster (file->appClus) != CLUSTER_EOF)) { file->appClus = FAT_NextCluster (file->appClus); } if (clusCount >= 0) // Check if ran out of clusters { // Set flag to allocate new cluster when needed file->appSect = filesysSecPerClus; file->appByte = 0; } } } // Now that file is created, open it file->read = ( strchr(mode, '+') != NULL ); file->write = false; file->append = true; // Calculate the sector and byte of the current position, // and store them file->appSect = (dirEntry.fileSize % filesysBytePerClus) / BYTE_PER_READ; file->appByte = dirEntry.fileSize % BYTE_PER_READ; // Store information about position within the file, for use // by FAT_fread, FAT_fseek, etc. file->firstCluster = startCluster; file->length = dirEntry.fileSize; file->curPos = dirEntry.fileSize; file->curClus = file->appClus; file->curSect = file->appSect; file->curByte = file->appByte; // Read into buffer disc_ReadSector( FAT_ClustToSect(file->curClus) + file->curSect, file->readBuffer); file->inUse = true; // We're using this file now return file; } #endif // Can only reach here if a bad mode was specified return NULL; } /*----------------------------------------------------------------- FAT_fclose(file) Closes a file FAT_FILE* file: IN handle of the file to close bool return OUT: true if successful, false if not -----------------------------------------------------------------*/ bool FAT_fclose (FAT_FILE* file) { // Clear memory used by file information if ((file != NULL) && (file->inUse == true)) { #ifdef CAN_WRITE_TO_DISC if (file->write || file->append) { // Write new length, time and date back to directory entry disc_ReadSector (file->dirEntSector, globalBuffer); ((DIR_ENT*)globalBuffer)[file->dirEntOffset].fileSize = file->length; ((DIR_ENT*)globalBuffer)[file->dirEntOffset].mTime = getRTCtoFileTime(); ((DIR_ENT*)globalBuffer)[file->dirEntOffset].mDate = getRTCtoFileDate(); ((DIR_ENT*)globalBuffer)[file->dirEntOffset].aDate = getRTCtoFileDate(); disc_WriteSector (file->dirEntSector, globalBuffer); // Flush any sectors in disc cache disc_CacheFlush(); } #endif file->inUse = false; return true; } else { return false; } } /*----------------------------------------------------------------- FAT_ftell(file) Returns the current position in a file FAT_FILE* file: IN handle of an open file u32 OUT: Current position -----------------------------------------------------------------*/ u32 FAT_ftell (FAT_FILE* file) { // Return the position as specified in the FAT_FILE structure if ((file != NULL) && (file->inUse == true)) { return file->curPos; } else { // Return -1 if no file was given return -1; } } /*----------------------------------------------------------------- FAT_fseek(file, offset, origin) Seeks to specified byte position in file FAT_FILE* file: IN handle of an open file s32 offset IN: position to seek to, relative to origin int origin IN: origin to seek from int OUT: Returns 0 if successful, -1 if not -----------------------------------------------------------------*/ int FAT_fseek(FAT_FILE* file, s32 offset, int origin) { u32 cluster, nextCluster; int clusCount; u32 position; u32 curPos; if ((file == NULL) || (file->inUse == false)) // invalid file { return -1; } // Can't seek in append only mode if (!file->read && !file->write) { return -1; } curPos = file->curPos; switch (origin) { case SEEK_SET: if (offset >= 0) { position = offset; } else { // Tried to seek before start of file position = 0; } break; case SEEK_CUR: if (offset >= 0) { position = curPos + offset; } else if ( (u32)(offset * -1) >= curPos ) { // Tried to seek before start of file position = 0; } else { // Using u32 to maintain 32 bits of accuracy position = curPos - (u32)(offset * -1); } break; case SEEK_END: if (offset >= 0) { // Seeking to end of file position = file->length; // Fixed thanks to MoonLight } else if ( (u32)(offset * -1) >= file->length ) { // Tried to seek before start of file position = 0; } else { // Using u32 to maintain 32 bits of accuracy position = file->length - (u32)(offset * -1); } break; default: return -1; } if (position > file->length) { // Tried to go past end of file position = file->length; } // Save position file->curPos = position; // Calculate where the correct cluster is if (position > curPos) { clusCount = (position - curPos + (file->curSect * filesysBytePerSec) + file->curByte) / filesysBytePerClus; // Fixed thanks to AgentQ cluster = file->curClus; } else { clusCount = position / filesysBytePerClus; cluster = file->firstCluster; } // Calculate the sector and byte of the current position, // and store them file->curSect = (position % filesysBytePerClus) / BYTE_PER_READ; file->curByte = position % BYTE_PER_READ; // Follow cluster list until desired one is found if (clusCount > 0) // Only look at next cluster if need to { nextCluster = FAT_NextCluster (cluster); } else { nextCluster = cluster; } while ((clusCount--) && (nextCluster != CLUSTER_FREE) && (nextCluster != CLUSTER_EOF)) { cluster = nextCluster; nextCluster = FAT_NextCluster (cluster); } // Check if ran out of clusters, and the file is being written to if ((clusCount >= 0) && (file->write || file->append)) { // Set flag to allocate a new cluster file->curSect = filesysSecPerClus; file->curByte = 0; } file->curClus = cluster; // Reload sector buffer for new position in file, if it is a different sector if ((curPos ^ position) >= BYTE_PER_READ) { disc_ReadSector( file->curSect + FAT_ClustToSect(file->curClus), file->readBuffer); } return 0; } /*----------------------------------------------------------------- FAT_fread(buffer, size, count, file) Reads in size * count bytes into buffer from file, starting from current position. It then sets the current position to the byte after the last byte read. If it reaches the end of file before filling the buffer then it stops reading. void* buffer OUT: Pointer to buffer to fill. Should be at least as big as the number of bytes required u32 size IN: size of each item to read u32 count IN: number of items to read FAT_FILE* file IN: Handle of an open file u32 OUT: returns the actual number of bytes read -----------------------------------------------------------------*/ u32 FAT_fread (void* buffer, u32 size, u32 count, FAT_FILE* file) { int curByte; int curSect; u32 curClus; u32 tempNextCluster; int tempVar; char* data = (char*)buffer; u32 length = size * count; u32 remain; bool flagNoError = true; // Can't read non-existant files if ((file == NULL) || (file->inUse == false) || size == 0 || count == 0 || buffer == NULL) return 0; // Can only read files openned for reading if (!file->read) return 0; // Don't read past end of file if (length + file->curPos > file->length) length = file->length - file->curPos; remain = length; curByte = file->curByte; curSect = file->curSect; curClus = file->curClus; // Align to sector tempVar = BYTE_PER_READ - curByte; if (tempVar > remain) tempVar = remain; if ((tempVar < BYTE_PER_READ) && flagNoError) { memcpy(data, &(file->readBuffer[curByte]), tempVar); remain -= tempVar; data += tempVar; curByte += tempVar; if (curByte >= BYTE_PER_READ) { curByte = 0; curSect++; } } // align to cluster // tempVar is number of sectors to read if (remain > (filesysSecPerClus - curSect) * BYTE_PER_READ) { tempVar = filesysSecPerClus - curSect; } else { tempVar = remain / BYTE_PER_READ; } if ((tempVar > 0) && flagNoError) { disc_ReadSectors ( curSect + FAT_ClustToSect(curClus), tempVar, data); data += tempVar * BYTE_PER_READ; remain -= tempVar * BYTE_PER_READ; curSect += tempVar; } // Move onto next cluster // It should get to here without reading anything if a cluster is due to be allocated if (curSect >= filesysSecPerClus) { tempNextCluster = FAT_NextCluster(curClus); if ((remain == 0) && (tempNextCluster == CLUSTER_EOF)) { curSect = filesysSecPerClus; } else { curSect = 0; curClus = tempNextCluster; if (curClus == CLUSTER_FREE) { flagNoError = false; } } } // Read in whole clusters while ((remain >= filesysBytePerClus) && flagNoError) { disc_ReadSectors (FAT_ClustToSect(curClus), filesysSecPerClus, data); data += filesysBytePerClus; remain -= filesysBytePerClus; // Advance to next cluster tempNextCluster = FAT_NextCluster(curClus); if ((remain == 0) && (tempNextCluster == CLUSTER_EOF)) { curSect = filesysSecPerClus; } else { curSect = 0; curClus = tempNextCluster; if (curClus == CLUSTER_FREE) { flagNoError = false; } } } // Read remaining sectors tempVar = remain / BYTE_PER_READ; // Number of sectors left if ((tempVar > 0) && flagNoError) { disc_ReadSectors (FAT_ClustToSect(curClus), tempVar, data); data += tempVar * BYTE_PER_READ; remain -= tempVar * BYTE_PER_READ; curSect += tempVar; } // Last remaining sector // Check if sector wanted is different to the one started with if ( ((file->curByte + length) >= BYTE_PER_READ) && flagNoError) { disc_ReadSector( curSect + FAT_ClustToSect( curClus), file->readBuffer); if (remain > 0) { memcpy(data, file->readBuffer, remain); curByte += remain; remain = 0; } } // Length read is the wanted length minus the stuff not read length = length - remain; // Update file information file->curByte = curByte; file->curSect = curSect; file->curClus = curClus; file->curPos = file->curPos + length; return length; } #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_fwrite(buffer, size, count, file) Writes size * count bytes into file from buffer, starting from current position. It then sets the current position to the byte after the last byte written. If the file was openned in append mode it always writes to the end of the file. const void* buffer IN: Pointer to buffer containing data. Should be at least as big as the number of bytes to be written. u32 size IN: size of each item to write u32 count IN: number of items to write FAT_FILE* file IN: Handle of an open file u32 OUT: returns the actual number of bytes written -----------------------------------------------------------------*/ u32 FAT_fwrite (const void* buffer, u32 size, u32 count, FAT_FILE* file) { int curByte; int curSect; u32 curClus; u32 tempNextCluster; int tempVar; u32 length = size * count; u32 remain = length; char* data = (char*)buffer; char* writeBuffer; bool flagNoError = true; bool flagAppending = false; if ((file == NULL) || (file->inUse == false) || length == 0 || buffer == NULL) return 0; if (file->write) { // Write at current read pointer curByte = file->curByte; curSect = file->curSect; curClus = file->curClus; // Use read buffer as write buffer writeBuffer = file->readBuffer; // If it is writing past the current end of file, set appending flag if (length + file->curPos > file->length) { flagAppending = true; } } else if (file->append) { // Write at end of file curByte = file->appByte; curSect = file->appSect; curClus = file->appClus; flagAppending = true; // Use global buffer as write buffer, don't touch read buffer writeBuffer = (char*)globalBuffer; disc_ReadSector(curSect + FAT_ClustToSect(curClus), writeBuffer); } else { return 0; } // Move onto next cluster if needed if (curSect >= filesysSecPerClus) { curSect = 0; tempNextCluster = FAT_NextCluster(curClus); if ((tempNextCluster == CLUSTER_EOF) || (tempNextCluster == CLUSTER_FREE)) { // Ran out of clusters so get a new one curClus = FAT_LinkFreeCluster(curClus); if (curClus == CLUSTER_FREE) // Couldn't get a cluster, so abort { flagNoError = false; } memset(writeBuffer, 0, BYTE_PER_READ); } else { curClus = tempNextCluster; disc_ReadSector( FAT_ClustToSect( curClus), writeBuffer); } } // Align to sector tempVar = BYTE_PER_READ - curByte; if (tempVar > remain) tempVar = remain; if ((tempVar < BYTE_PER_READ) && flagNoError) { memcpy(&(writeBuffer[curByte]), data, tempVar); remain -= tempVar; data += tempVar; curByte += tempVar; // Write buffer back to disk disc_WriteSector (curSect + FAT_ClustToSect(curClus), writeBuffer); // Move onto next sector if (curByte >= BYTE_PER_READ) { curByte = 0; curSect++; } } // Align to cluster // tempVar is number of sectors to write if (remain > (filesysSecPerClus - curSect) * BYTE_PER_READ) { tempVar = filesysSecPerClus - curSect; } else { tempVar = remain / BYTE_PER_READ; } if ((tempVar > 0) && flagNoError) { disc_WriteSectors ( curSect + FAT_ClustToSect(curClus), tempVar, data); data += tempVar * BYTE_PER_READ; remain -= tempVar * BYTE_PER_READ; curSect += tempVar; } if (((curSect >= filesysSecPerClus) && flagNoError) && (remain > 0)) { curSect = 0; tempNextCluster = FAT_NextCluster(curClus); if ((tempNextCluster == CLUSTER_EOF) || (tempNextCluster == CLUSTER_FREE)) { // Ran out of clusters so get a new one curClus = FAT_LinkFreeCluster(curClus); if (curClus == CLUSTER_FREE) // Couldn't get a cluster, so abort { flagNoError = false; } } else { curClus = tempNextCluster; } } // Write whole clusters while ((remain >= filesysBytePerClus) && flagNoError) { disc_WriteSectors (FAT_ClustToSect(curClus), filesysSecPerClus, data); data += filesysBytePerClus; remain -= filesysBytePerClus; if (remain > 0) { tempNextCluster = FAT_NextCluster(curClus); if ((tempNextCluster == CLUSTER_EOF) || (tempNextCluster == CLUSTER_FREE)) { // Ran out of clusters so get a new one curClus = FAT_LinkFreeCluster(curClus); if (curClus == CLUSTER_FREE) // Couldn't get a cluster, so abort { flagNoError = false; break; } } else { curClus = tempNextCluster; } } else { // Allocate a new cluster when next writing the file curSect = filesysSecPerClus; } } // Write remaining sectors tempVar = remain / BYTE_PER_READ; // Number of sectors left if ((tempVar > 0) && flagNoError) { disc_WriteSectors (FAT_ClustToSect(curClus), tempVar, data); data += tempVar * BYTE_PER_READ; remain -= tempVar * BYTE_PER_READ; curSect += tempVar; } // Last remaining sector // Check if sector wanted is different to the one started with if ( (( (file->append ? file->appByte : file->curByte) + length) >= BYTE_PER_READ) && flagNoError) { if (flagAppending) { // Zero sector before using it memset (writeBuffer, 0, BYTE_PER_READ); } else { // Modify existing sector disc_ReadSector( curSect + FAT_ClustToSect( curClus), writeBuffer); } if (remain > 0) { memcpy(writeBuffer, data, remain); curByte += remain; remain = 0; disc_WriteSector( curSect + FAT_ClustToSect( curClus), writeBuffer); } } // Amount read is the originally requested amount minus stuff remaining length = length - remain; // Update file information if (file->write) // Writing also shifts the read pointer { file->curByte = curByte; file->curSect = curSect; file->curClus = curClus; file->curPos = file->curPos + length; if (file->length < file->curPos) { file->length = file->curPos; } } else if (file->append) // Appending doesn't affect the read pointer { file->appByte = curByte; file->appSect = curSect; file->appClus = curClus; file->length = file->length + length; } return length; } #endif /*----------------------------------------------------------------- FAT_feof(file) Returns true if the end of file has been reached FAT_FILE* file IN: Handle of an open file bool return OUT: true if EOF, false if not -----------------------------------------------------------------*/ bool FAT_feof(FAT_FILE* file) { if ((file == NULL) || (file->inUse == false)) return true; // Return eof on invalid files return (file->length == file->curPos); } #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_remove (path) Deletes the file or empty directory sepecified in path const char* path IN: Path of item to delete int return OUT: zero if successful, non-zero if not -----------------------------------------------------------------*/ int FAT_remove (const char* path) { DIR_ENT dirEntry; u32 oldWorkDirCluster; char checkFilename[13]; FILE_TYPE checkFiletype; dirEntry = FAT_DirEntFromPath (path); if (dirEntry.name[0] == FILE_FREE) { return -1; } // Only delete directories if the directory is entry if (dirEntry.attrib & ATTRIB_DIR) { // Change to the directory temporarily oldWorkDirCluster = curWorkDirCluster; FAT_chdir(path); // Search for files or directories, excluding the . and .. entries checkFiletype = FAT_FindFirstFile (checkFilename); while ((checkFilename[0] == '.') && (checkFiletype != FT_NONE)) { checkFiletype = FAT_FindNextFile (checkFilename); } // Change back to working directory curWorkDirCluster = oldWorkDirCluster; // Check that the directory is empty if (checkFiletype != FT_NONE) { // Directory isn't empty return -1; } } // Refresh directory information dirEntry = FAT_DirEntFromPath (path); // Free any clusters used FAT_ClearLinks (dirEntry.startCluster | (dirEntry.startClusterHigh << 16)); // Remove Directory entry disc_ReadSector ( (wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector , globalBuffer); ((DIR_ENT*)globalBuffer)[wrkDirOffset].name[0] = FILE_FREE; disc_WriteSector ( (wrkDirCluster == FAT16_ROOT_DIR_CLUSTER ? filesysRootDir : FAT_ClustToSect(wrkDirCluster)) + wrkDirSector , globalBuffer); // Flush any sectors in disc cache disc_CacheFlush(); return 0; } #endif #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_mkdir (path) Makes a new directory, so long as no other directory or file has the same name. const char* path IN: Path and filename of directory to make int return OUT: zero if successful, non-zero if not -----------------------------------------------------------------*/ int FAT_mkdir (const char* path) { u32 newDirCluster; u32 parentDirCluster; DIR_ENT dirEntry; DIR_ENT* entries = (DIR_ENT*)globalBuffer; int i; int pathPos, filePos; char pathname[MAX_FILENAME_LENGTH]; u32 oldDirCluster; if (FAT_FileExists(path) != FT_NONE) { return -1; // File or directory exists with that name } // Find filename within path and change to that directory oldDirCluster = curWorkDirCluster; if (path[0] == '/') { curWorkDirCluster = filesysRootDirClus; } pathPos = 0; filePos = 0; while (path[pathPos + filePos] != '\0') { if (path[pathPos + filePos] == '/') { pathname[filePos] = '\0'; if (FAT_chdir(pathname) == false) { curWorkDirCluster = oldDirCluster; return -1; // Couldn't change directory } pathPos += filePos + 1; filePos = 0; } pathname[filePos] = path[pathPos + filePos]; filePos++; } // Now grab the parent directory's cluster parentDirCluster = curWorkDirCluster; curWorkDirCluster = oldDirCluster; // Get a new cluster for the file newDirCluster = FAT_LinkFreeCluster(CLUSTER_FREE); if (newDirCluster == CLUSTER_FREE) { return -1; // Couldn't get a new cluster for the directory } // Fill in directory entry's information dirEntry.attrib = ATTRIB_DIR; dirEntry.reserved = 0; // Time and date set to system time and date dirEntry.cTime_ms = 0; dirEntry.cTime = getRTCtoFileTime(); dirEntry.cDate = getRTCtoFileDate(); dirEntry.aDate = getRTCtoFileDate(); dirEntry.mTime = getRTCtoFileTime(); dirEntry.mDate = getRTCtoFileDate(); // Store cluster position into the directory entry dirEntry.startCluster = (newDirCluster & 0xFFFF); dirEntry.startClusterHigh = ((newDirCluster >> 16) & 0xFFFF); // The file has no data in it - its over written so should be empty dirEntry.fileSize = 0; if (FAT_AddDirEntry (path, dirEntry) == false) { return -1; // Couldn't add the directory entry } // Create the new directory itself memset(entries, FILE_LAST, BYTE_PER_READ); // Create . directory entry dirEntry.name[0] = '.'; // Fill name and extension with spaces for (i = 1; i < 11; i++) { dirEntry.name[i] = ' '; } memcpy(entries, &dirEntry, sizeof(dirEntry)); // Create .. directory entry dirEntry.name[1] = '.'; dirEntry.startCluster = (parentDirCluster & 0xFFFF); dirEntry.startClusterHigh = ((parentDirCluster >> 16) & 0xFFFF); memcpy(&entries[1], &dirEntry, sizeof(dirEntry)); // Write entry to disc disc_WriteSector(FAT_ClustToSect(newDirCluster), entries); // Flush any sectors in disc cache disc_CacheFlush(); return 0; } #endif /*----------------------------------------------------------------- FAT_fgetc (handle) Gets the next character in the file FAT_FILE* file IN: Handle of open file bool return OUT: character if successful, EOF if not -----------------------------------------------------------------*/ char FAT_fgetc (FAT_FILE* file) { char c; return (FAT_fread(&c, 1, 1, file) == 1) ? c : EOF; } #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_fputc (character, handle) Writes the given character into the file char c IN: Character to be written FAT_FILE* file IN: Handle of open file bool return OUT: character if successful, EOF if not -----------------------------------------------------------------*/ char FAT_fputc (char c, FAT_FILE* file) { return (FAT_fwrite(&c, 1, 1, file) == 1) ? c : EOF; } #endif /*----------------------------------------------------------------- FAT_fgets (char *tgtBuffer, int num, FAT_FILE* file) Gets a up to num bytes from file, stopping at the first newline. CAUTION: does not do strictly streaming. I.e. it's reading more then needed bytes and seeking back. shouldn't matter for random access char *tgtBuffer OUT: buffer to write to int num IN: size of target buffer FAT_FILE* file IN: Handle of open file bool return OUT: character if successful, EOF if not Written by MightyMax Modified by Chishm - 2005-11-17 * Added check for unix style text files * Removed seek when no newline is found, since it isn't necessary -------------------------------------------------------------------*/ char *FAT_fgets(char *tgtBuffer, int num, FAT_FILE* file) { u32 curPos; u32 readLength; char *returnChar; // invalid filehandle if (file == NULL) { return NULL ; } // end of file if (FAT_feof(file)==true) { return NULL ; } // save current position curPos = FAT_ftell(file); // read the full buffer (max string chars is num-1 and one end of string \0 readLength = FAT_fread(tgtBuffer,1,num-1,file) ; // mark least possible end of string tgtBuffer[readLength] = '\0' ; if (readLength==0) { // return error return NULL ; } // get position of first return '\r' returnChar = strchr(tgtBuffer,'\r'); // if no return is found, search for a newline if (returnChar == NULL) { returnChar = strchr(tgtBuffer,'\n'); } // Mark the return, if existant, as end of line/string if (returnChar!=NULL) { *returnChar++ = 0 ; if (*returnChar=='\n') { // catch newline too when jumping over the end // return to location after \r\n (strlen+2) FAT_fseek(file,curPos+strlen(tgtBuffer)+2,SEEK_SET) ; return tgtBuffer ; } else { // return to location after \r (strlen+1) FAT_fseek(file,curPos+strlen(tgtBuffer)+1,SEEK_SET) ; return tgtBuffer ; } } return tgtBuffer ; } #ifdef CAN_WRITE_TO_DISC /*----------------------------------------------------------------- FAT_fputs (const char *string, FAT_FILE* file) Writes string to file, excluding end of string character const char *string IN: string to write FAT_FILE* file IN: Handle of open file bool return OUT: number of characters written if successful, EOF if not Written by MightyMax Modified by Chishm - 2005-11-17 * Uses FAT_FILE instead of int * writtenBytes is now u32 instead of int -------------------------------------------------------------------*/ int FAT_fputs (const char *string, FAT_FILE* file) { u32 writtenBytes; // save string except end of string '\0' writtenBytes = FAT_fwrite((void *)string, 1, strlen(string), file); // check if we had an error if (writtenBytes != strlen(string)) { // return EOF error return EOF; } // return the charcount written return writtenBytes ; } #endif