3 * FAT12/16/32 Driver Version (Incl LFN)
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8 #define CACHE_FAT 1 //!< Caches the FAT in memory
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9 #define USE_LFN 1 //!< Enables the use of Long File Names
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12 #include <modules.h>
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19 typedef struct s_lfncache
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25 struct s_lfncache *Next;
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29 // === PROTOTYPES ===
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30 int FAT_Install(char **Arguments);
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31 tVFS_Node *FAT_InitDevice(char *device, char **options);
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32 void FAT_Unmount(tVFS_Node *Node);
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34 Uint32 FAT_int_GetFatValue(tFAT_VolInfo *Disk, Uint32 Cluster);
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35 Uint32 FAT_int_AllocateCluster(tFAT_VolInfo *Disk, Uint32 Previous);
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37 void FAT_int_ReadCluster(tFAT_VolInfo *Disk, Uint32 Cluster, int Length, void *Buffer);
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38 void FAT_int_WriteCluster(tFAT_VolInfo *Disk, Uint32 Cluster, void *Buffer);
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40 Uint64 FAT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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41 Uint64 FAT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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42 char *FAT_ReadDir(tVFS_Node *Node, int ID);
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43 tVFS_Node *FAT_FindDir(tVFS_Node *Node, char *Name);
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44 int FAT_Mknod(tVFS_Node *Node, char *Name, Uint Flags);
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45 int FAT_Relink(tVFS_Node *node, char *OldName, char *NewName);
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46 void FAT_CloseFile(tVFS_Node *node);
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48 // === SEMI-GLOBALS ===
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49 MODULE_DEFINE(0, (0<<8)|50 /*v0.50*/, VFAT, FAT_Install, NULL, NULL);
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50 tFAT_VolInfo gFAT_Disks[8];
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51 int giFAT_PartCount = 0;
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53 t_lfncache *fat_lfncache;
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55 tVFS_Driver gFAT_FSInfo = {"fat", 0, FAT_InitDevice, FAT_Unmount, NULL};
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59 * \fn int FAT_Install(char **Arguments)
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62 int FAT_Install(char **Arguments)
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64 VFS_AddDriver( &gFAT_FSInfo );
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65 return MODULE_ERR_OK;
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69 * \fn tVFS_Node *FAT_InitDevice(char *Device, char **Options)
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70 * \brief Reads the boot sector of a disk and prepares the structures for it
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72 tVFS_Node *FAT_InitDevice(char *Device, char **Options)
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76 Uint32 FATSz, RootDirSectors, TotSec;
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77 tVFS_Node *node = NULL;
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78 tFAT_VolInfo *diskInfo = &gFAT_Disks[giFAT_PartCount];
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80 // Temporary Pointer
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81 bs = &diskInfo->bootsect;
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83 //Open device and read boot sector
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84 diskInfo->fileHandle = VFS_Open(Device, VFS_OPENFLAG_READ|VFS_OPENFLAG_WRITE);
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85 if(diskInfo->fileHandle == -1) {
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86 Warning("FAT_InitDisk - Unable to open device '%s'", Device);
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90 VFS_ReadAt(diskInfo->fileHandle, 0, 512, bs);
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92 if(bs->bps == 0 || bs->spc == 0) {
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93 Warning("FAT_InitDisk - Error in FAT Boot Sector\n");
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97 // FAT Type Determining
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98 // - From Microsoft FAT Specifcation
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99 RootDirSectors = ((bs->files_in_root*32) + (bs->bps - 1)) / bs->bps;
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101 if(bs->fatSz16 != 0) FATSz = bs->fatSz16;
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102 else FATSz = bs->spec.fat32.fatSz32;
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104 if(bs->totalSect16 != 0) TotSec = bs->totalSect16;
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105 else TotSec = bs->totalSect32;
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107 diskInfo->ClusterCount = (TotSec - (bs->resvSectCount + (bs->fatCount * FATSz) + RootDirSectors)) / bs->spc;
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109 if(diskInfo->ClusterCount < 4085)
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110 diskInfo->type = FAT12;
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111 else if(diskInfo->ClusterCount < 65525)
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112 diskInfo->type = FAT16;
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114 diskInfo->type = FAT32;
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118 char *sFatType, *sSize;
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119 Uint iSize = diskInfo->ClusterCount * bs->spc * bs->bps / 1024;
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121 switch(diskInfo->type)
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123 case FAT12: sFatType = "FAT12"; break;
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124 case FAT16: sFatType = "FAT16"; break;
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125 case FAT32: sFatType = "FAT32"; break;
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126 default: sFatType = "UNKNOWN"; break;
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128 if(iSize <= 2*1024) {
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131 else if(iSize <= 2*1024*1024) {
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139 Log("[FAT ] '%s' %s, %i %s", Device, sFatType, iSize, sSize);
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144 if(diskInfo->type == FAT32) {
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146 diskInfo->name[i] = (bs->spec.fat32.label[i] == ' ' ? '\0' : bs->spec.fat32.label[i]);
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150 diskInfo->name[i] = (bs->spec.fat16.label[i] == ' ' ? '\0' : bs->spec.fat16.label[i]);
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152 diskInfo->name[11] = '\0';
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154 // Compute Root directory offset
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155 if(diskInfo->type == FAT32)
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156 diskInfo->rootOffset = bs->spec.fat32.rootClust;
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158 diskInfo->rootOffset = (FATSz * bs->fatCount) / bs->spc;
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160 diskInfo->firstDataSect = bs->resvSectCount + (bs->fatCount * FATSz) + RootDirSectors;
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162 //Allow for Caching the FAT
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166 diskInfo->FATCache = (Uint32*)malloc(sizeof(Uint32)*diskInfo->ClusterCount);
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167 if(diskInfo->FATCache == NULL) {
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168 Warning("FAT_InitDisk - Heap Exhausted\n");
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171 Ofs = bs->resvSectCount*512;
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172 if(diskInfo->type == FAT12)
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177 for(i = 0; i < diskInfo->ClusterCount/2; i++) {
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178 j = i & 511; //%512
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180 VFS_ReadAt(diskInfo->fileHandle, Ofs, 3*512, buf);
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183 val = *((int*)(buf+j*3));
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184 diskInfo->FATCache[i*2] = val & 0xFFF;
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185 diskInfo->FATCache[i*2+1] = (val>>12) & 0xFFF;
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188 else if(diskInfo->type == FAT16)
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191 for(i=0;i<diskInfo->ClusterCount;i++) {
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192 if( (i & 255) == 0 ) {
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193 VFS_ReadAt(diskInfo->fileHandle, Ofs, 512, buf);
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196 diskInfo->FATCache[i] = buf[i&255];
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199 else if(diskInfo->type == FAT32)
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202 for(i=0;i<diskInfo->ClusterCount;i++) {
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203 if( (i & 127) == 0 ) {
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204 VFS_ReadAt(diskInfo->fileHandle, Ofs, 512, buf);
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207 diskInfo->FATCache[i] = buf[i&127];
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210 LOG("FAT Fully Cached");
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212 #endif /*CACHE_FAT*/
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214 diskInfo->BytesPerCluster = bs->spc * bs->bps;
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216 // Initalise inode cache for filesystem
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217 diskInfo->inodeHandle = Inode_GetHandle();
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218 LOG("Inode Cache handle is %i", diskInfo->inodeHandle);
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220 // == VFS Interface
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221 node = &diskInfo->rootNode;
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222 node->Size = bs->files_in_root;
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223 node->Inode = diskInfo->rootOffset; // 0:31 - Cluster, 32:63 - Parent Directory Cluster
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224 node->ImplPtr = diskInfo; // Disk info pointer
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225 node->ImplInt = 0; // 0:15 - Directory Index, 16: Dirty Flag
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227 node->ReferenceCount = 1;
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229 node->UID = 0; node->GID = 0;
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231 node->ACLs = &gVFS_ACL_EveryoneRWX;
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232 node->Flags = VFS_FFLAG_DIRECTORY;
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233 node->CTime = node->MTime = node->ATime = now();
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235 node->Read = node->Write = NULL;
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236 node->ReadDir = FAT_ReadDir;
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237 node->FindDir = FAT_FindDir;
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238 node->Relink = FAT_Relink;
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239 node->MkNod = FAT_Mknod;
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240 //node->Close = FAT_Unmount;
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242 giFAT_PartCount ++;
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247 * \brief Closes a mount and marks it as free
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248 * \param Node Mount Root
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250 * \todo Remove FAT Cache
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251 * \todo Clear LFN Cache
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252 * \todo Check that all files are closed and flushed
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254 void FAT_Unmount(tVFS_Node *Node)
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256 tFAT_VolInfo *disk = Node->ImplPtr;
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258 // Close Disk Handle
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259 VFS_Close( disk->fileHandle );
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260 // Clear Node Cache
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261 Inode_ClearCache(disk->inodeHandle);
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263 disk->fileHandle = -2;
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271 * \fn Uint32 FAT_int_GetFatValue(tFAT_VolInfo *Disk, Uint32 cluster)
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272 * \brief Fetches a value from the FAT
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274 Uint32 FAT_int_GetFatValue(tFAT_VolInfo *Disk, Uint32 cluster)
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278 Uint32 ofs = Disk->bootsect.resvSectCount*512;
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280 ENTER("pDisk xCluster", Disk, cluster);
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281 LOCK( &Disk->lFAT );
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283 val = Disk->FATCache[cluster];
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284 if(Disk->type == FAT12 && val == EOC_FAT12) val = -1;
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285 if(Disk->type == FAT16 && val == EOC_FAT16) val = -1;
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286 if(Disk->type == FAT32 && val == EOC_FAT32) val = -1;
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288 if(Disk->type == FAT12) {
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289 VFS_ReadAt(Disk->fileHandle, ofs+(cluster>>1)*3, 3, &val);
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290 val = (cluster&1 ? val&0xFFF : val>>12);
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291 if(val == EOC_FAT12) val = -1;
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292 } else if(Disk->type == FAT16) {
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293 VFS_ReadAt(Disk->fileHandle, ofs+cluster*2, 2, &val);
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294 if(val == EOC_FAT16) val = -1;
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296 VFS_ReadAt(Disk->fileHandle, ofs+cluster*4, 4, &val);
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297 if(val == EOC_FAT32) val = -1;
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299 #endif /*CACHE_FAT*/
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300 RELEASE( &Disk->lFAT );
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306 * \brief Allocate a new cluster
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308 Uint32 FAT_int_AllocateCluster(tFAT_VolInfo *Disk, Uint32 Previous)
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310 Uint32 ret = Previous;
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315 for(ret = Previous; ret < Disk->ClusterCount; ret++)
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317 if(Disk->FATCache[ret] == 0)
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320 for(ret = 0; ret < Previous; ret++)
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322 if(Disk->FATCache[ret] == 0)
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326 RELEASE(Disk->lFAT);
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332 case FAT12: eoc = EOC_FAT12; break;
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333 case FAT16: eoc = EOC_FAT16; break;
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334 case FAT32: eoc = EOC_FAT32; break;
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338 Disk->FATCache[ret] = eoc;
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339 Disk->FATCache[Previous] = ret;
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341 RELEASE(Disk->lFAT);
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346 Warning("[FAT ] TODO: Implement cluster allocation with non cached FAT");
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349 if(Disk->type == FAT12) {
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350 VFS_ReadAt(Disk->fileHandle, ofs+(Previous>>1)*3, 3, &val);
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351 if( Previous & 1 ) {
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359 VFS_WriteAt(Disk->fileHandle, ofs+(Previous>>1)*3, 3, &val);
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361 VFS_ReadAt(Disk->fileHandle, ofs+(Cluster>>1)*3, 3, &val);
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362 if( Cluster & 1 ) {
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370 VFS_WriteAt(Disk->fileHandle, ofs+(Cluster>>1)*3, 3, &val);
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371 } else if(Disk->type == FAT16) {
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372 VFS_ReadAt(Disk->fileHandle, ofs+Previous*2, 2, &ret);
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373 VFS_ReadAt(Disk->fileHandle, ofs+Cluster*2, 2, &eoc);
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375 VFS_ReadAt(Disk->fileHandle, ofs+Previous*4, 4, &ret);
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376 VFS_ReadAt(Disk->fileHandle, ofs+Cluster*4, 4, &eoc);
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383 * \brief Read a cluster
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385 void FAT_int_ReadCluster(tFAT_VolInfo *Disk, Uint32 Cluster, int Length, void *Buffer)
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387 ENTER("pDisk xCluster iLength pBuffer", Disk, Cluster, Length, Buffer);
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388 //Log("Cluster = %i (0x%x)", Cluster, Cluster);
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391 (Disk->firstDataSect + (Cluster-2)*Disk->bootsect.spc )
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392 * Disk->bootsect.bps,
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400 * \brief Write a cluster to disk
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402 void FAT_int_WriteCluster(tFAT_VolInfo *Disk, Uint32 Cluster, void *Buffer)
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404 ENTER("pDisk xCluster pBuffer", Disk, Cluster, Buffer);
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407 (Disk->firstDataSect + (Cluster-2)*Disk->bootsect.spc )
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408 * Disk->bootsect.bps,
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409 Disk->BytesPerCluster,
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416 * \fn Uint64 FAT_Read(tVFS_Node *node, Uint64 offset, Uint64 length, void *buffer)
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417 * \brief Reads data from a specified file
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419 Uint64 FAT_Read(tVFS_Node *Node, Uint64 offset, Uint64 length, void *buffer)
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421 int preSkip, count;
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422 int i, cluster, pos;
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425 tFAT_VolInfo *disk = Node->ImplPtr;
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427 ENTER("pNode Xoffset Xlength pbuffer", Node, offset, length, buffer);
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429 // Calculate and Allocate Bytes Per Cluster
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430 bpc = disk->BytesPerCluster;
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431 tmpBuf = (void*) malloc(bpc);
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432 if( !tmpBuf ) return 0;
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434 // Cluster is stored in Inode Field
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435 cluster = Node->Inode & 0xFFFFFFFF;
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437 // Sanity Check offset
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438 if(offset > Node->Size) {
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439 //LOG("Reading past EOF (%i > %i)", offset, node->Size);
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444 if(offset + length > Node->Size) {
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445 //LOG("Reading past EOF (%lli + %lli > %lli), clamped to %lli",
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446 // offset, length, node->Size, node->Size - offset);
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447 length = Node->Size - offset;
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450 // Single Cluster including offset
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451 if(length + offset < bpc)
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453 FAT_int_ReadCluster(disk, cluster, bpc, tmpBuf);
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454 memcpy( buffer, (void*)( tmpBuf + offset%bpc ), length );
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460 preSkip = offset / bpc;
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462 //Skip previous clusters
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463 for(i=preSkip;i--;) {
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464 cluster = FAT_int_GetFatValue(disk, cluster);
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465 if(cluster == -1) {
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466 Warning("FAT_Read - Offset is past end of cluster chain mark");
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472 // Get Count of Clusters to read
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473 count = ((offset%bpc+length) / bpc) + 1;
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475 // Get buffer Position after 1st cluster
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476 pos = bpc - offset%bpc;
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478 // Read 1st Cluster
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479 FAT_int_ReadCluster(disk, cluster, bpc, tmpBuf);
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482 (void*)( tmpBuf + (bpc-pos) ),
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483 (pos < length ? pos : length)
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492 cluster = FAT_int_GetFatValue(disk, cluster);
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495 LOG("pos=%i\n", pos);
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496 LOG("Reading the rest of the clusters\n");
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500 //Read the rest of the cluster data
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501 for( i = 1; i < count-1; i++ )
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503 FAT_int_ReadCluster(disk, cluster, bpc, tmpBuf);
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504 memcpy((void*)(buffer+pos), tmpBuf, bpc);
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506 cluster = FAT_int_GetFatValue(disk, cluster);
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507 if(cluster == -1) {
\r
508 Warning("FAT_Read - Read past End of Cluster Chain");
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515 FAT_int_ReadCluster(disk, cluster, bpc, tmpBuf);
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516 memcpy((void*)(buffer+pos), tmpBuf, length-pos);
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519 LOG("Free tmpBuf(0x%x) and Return\n", tmpBuf);
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523 LEAVE('X', length);
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528 * \brief Write to a file
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529 * \param Node File Node
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530 * \param Offset Offset within file
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531 * \param Length Size of data to write
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532 * \param Buffer Data source
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534 Uint64 FAT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
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536 tFAT_VolInfo *disk = Node->ImplPtr;
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538 int remLength = Length;
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539 Uint32 cluster, tmpCluster;
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540 int bNewCluster = 0;
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542 if(Offset > Node->Size) return 0;
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545 cluster = Node->Inode & 0xFFFFFFFF;
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546 while( Offset > disk->BytesPerCluster )
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548 cluster = FAT_int_GetFatValue( disk, cluster );
\r
549 if(cluster == -1) {
\r
550 Warning("[FAT ] EOC Unexpectedly Reached");
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553 Offset -= disk->BytesPerCluster;
\r
555 if( Offset == disk->BytesPerCluster )
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557 Uint32 tmp = FAT_int_AllocateCluster(disk, cluster);
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560 Offset -= disk->BytesPerCluster;
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563 if( Offset + Length < disk->BytesPerCluster )
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565 tmpBuf = malloc( disk->BytesPerCluster );
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567 // Read-Modify-Write
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568 FAT_int_ReadCluster( disk, cluster, disk->BytesPerCluster, tmpBuf );
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569 memcpy( tmpBuf + Offset, Buffer, Length );
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570 FAT_int_WriteCluster( disk, cluster, tmpBuf );
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576 // Clean up changes within a cluster
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579 tmpBuf = malloc( disk->BytesPerCluster );
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581 // Read-Modify-Write
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582 FAT_int_ReadCluster( disk, cluster, disk->BytesPerCluster, tmpBuf );
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583 memcpy( tmpBuf + Offset, Buffer, disk->BytesPerCluster - Offset );
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584 FAT_int_WriteCluster( disk, cluster, tmpBuf );
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588 remLength -= disk->BytesPerCluster - Offset;
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589 Buffer += disk->BytesPerCluster - Offset;
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591 // Get next cluster (allocating if needed)
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592 tmpCluster = FAT_int_GetFatValue(disk, cluster);
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593 if(tmpCluster == -1) {
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594 tmpCluster = FAT_int_AllocateCluster(disk, cluster);
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595 if( tmpCluster == 0 ) {
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596 return Length - remLength;
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599 cluster = tmpCluster;
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602 while( remLength > disk->BytesPerCluster )
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604 FAT_int_WriteCluster( disk, cluster, Buffer );
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605 Buffer += disk->BytesPerCluster;
\r
607 // Get next cluster (allocating if needed)
\r
608 tmpCluster = FAT_int_GetFatValue(disk, cluster);
\r
609 if(tmpCluster == -1) {
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611 tmpCluster = FAT_int_AllocateCluster(disk, cluster);
\r
612 if( tmpCluster == 0 ) {
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613 return Length - remLength;
\r
616 cluster = tmpCluster;
\r
620 tmpBuf = malloc( disk->BytesPerCluster );
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622 memset(tmpBuf, 0, disk->BytesPerCluster);
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624 FAT_int_ReadCluster( disk, cluster, disk->BytesPerCluster, tmpBuf );
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625 memcpy( tmpBuf, Buffer, remLength );
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626 FAT_int_WriteCluster( disk, cluster, tmpBuf );
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633 * \fn void FAT_int_ProperFilename(char *dest, char *src)
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634 * \brief Converts a FAT directory entry name into a proper filename
\r
636 void FAT_int_ProperFilename(char *dest, char *src)
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640 for( a = 0; a < 8; a++) {
\r
641 if(src[a] == ' ') break;
\r
648 for( ; a < 11; a++, b++) {
\r
649 if(src[a] == ' ') break;
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654 //LOG("dest='%s'", dest);
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659 * \fn char *FAT_int_CreateName(tVFS_Node *parent, fat_filetable *ft, char *LongFileName)
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660 * \brief Converts either a LFN or a 8.3 Name into a proper name
\r
662 char *FAT_int_CreateName(tVFS_Node *parent, fat_filetable *ft, char *LongFileName)
\r
667 if(LongFileName && LongFileName[0] != '\0')
\r
669 len = strlen(LongFileName);
\r
670 ret = malloc(len+1);
\r
671 strcpy(ret, LongFileName);
\r
676 ret = (char*) malloc(13);
\r
677 memset(ret, 13, '\0');
\r
678 FAT_int_ProperFilename(ret, ft->name);
\r
686 * \fn tVFS_Node *FAT_int_CreateNode(tVFS_Node *parent, fat_filetable *ft, char *LongFileName)
\r
687 * \brief Creates a tVFS_Node structure for a given file entry
\r
689 tVFS_Node *FAT_int_CreateNode(tVFS_Node *parent, fat_filetable *ft, char *LongFileName)
\r
691 tVFS_Node node = {0};
\r
693 tFAT_VolInfo *disk = parent->ImplPtr;
\r
695 ENTER("pParent pFT sLongFileName", parent, ft, LongFileName);
\r
698 node.Inode = ft->cluster | (ft->clusterHi<<16);
\r
699 node.Size = ft->size;
\r
700 LOG("ft->size = %i", ft->size);
\r
701 node.ImplPtr = parent->ImplPtr;
\r
702 node.UID = 0; node.GID = 0;
\r
706 if(ft->attrib & ATTR_DIRECTORY) node.Flags |= VFS_FFLAG_DIRECTORY;
\r
707 if(ft->attrib & ATTR_READONLY) {
\r
708 node.Flags |= VFS_FFLAG_READONLY;
\r
709 node.ACLs = &gVFS_ACL_EveryoneRX; // R-XR-XR-X
\r
712 node.ACLs = &gVFS_ACL_EveryoneRWX; // RWXRWXRWX
\r
715 node.ATime = timestamp(0,0,0,
\r
716 ((ft->adate&0x1F)-1), //Days
\r
717 ((ft->adate&0x1E0)-1), //Months
\r
718 1980+((ft->adate&0xFF00)>>8)); //Years
\r
720 node.CTime = ft->ctimems * 10; //Miliseconds
\r
721 node.CTime += timestamp(
\r
722 (ft->ctime&0x1F)<<1, //Seconds
\r
723 ((ft->ctime&0x3F0)>>5), //Minutes
\r
724 ((ft->ctime&0xF800)>>11), //Hours
\r
725 ((ft->cdate&0x1F)-1), //Days
\r
726 ((ft->cdate&0x1E0)-1), //Months
\r
727 1980+((ft->cdate&0xFF00)>>8)); //Years
\r
729 node.MTime = timestamp(
\r
730 (ft->mtime&0x1F)<<1, //Seconds
\r
731 ((ft->mtime&0x3F0)>>5), //Minuites
\r
732 ((ft->mtime&0xF800)>>11), //Hours
\r
733 ((ft->mdate&0x1F)-1), //Days
\r
734 ((ft->mdate&0x1E0)-1), //Months
\r
735 1980+((ft->mdate&0xFF00)>>8)); //Years
\r
737 if(node.Flags & VFS_FFLAG_DIRECTORY) {
\r
738 node.ReadDir = FAT_ReadDir;
\r
739 node.FindDir = FAT_FindDir;
\r
740 node.MkNod = FAT_Mknod;
\r
743 node.Read = FAT_Read;
\r
744 node.Write = FAT_Write;
\r
746 node.Close = FAT_CloseFile;
\r
747 node.Relink = FAT_Relink;
\r
749 ret = Inode_CacheNode(disk->inodeHandle, &node);
\r
756 \fn char *FAT_int_GetLFN(tVFS_Node *node)
\r
757 \brief Return pointer to LFN cache entry
\r
759 char *FAT_int_GetLFN(tVFS_Node *node)
\r
762 tmp = fat_lfncache;
\r
765 if(tmp->Inode == node->Inode && tmp->Disk == node->ImplPtr)
\r
769 tmp = malloc(sizeof(t_lfncache));
\r
770 tmp->Inode = node->Inode;
\r
771 tmp->Disk = node->ImplPtr;
\r
772 memset(tmp->Name, 0, 256);
\r
774 tmp->Next = fat_lfncache;
\r
775 fat_lfncache = tmp;
\r
781 \fn void FAT_int_DelLFN(tVFS_Node *node)
\r
782 \brief Delete a LFN cache entry
\r
784 void FAT_int_DelLFN(tVFS_Node *node)
\r
788 if(!fat_lfncache) return;
\r
790 if(!fat_lfncache->Next)
\r
792 tmp = fat_lfncache;
\r
793 fat_lfncache = tmp->Next;
\r
797 tmp = fat_lfncache;
\r
798 while(tmp && tmp->Next)
\r
800 if(tmp->Inode == node->Inode && tmp->Disk == node->ImplPtr)
\r
803 tmp->Next = tmp->Next->Next;
\r
812 \fn char *FAT_ReadDir(tVFS_Node *Node, int ID)
\r
813 \param Node Node structure of directory
\r
814 \param ID Directory position
\r
816 char *FAT_ReadDir(tVFS_Node *Node, int ID)
\r
818 fat_filetable fileinfo[16]; //Sizeof=32, 16 per sector
\r
820 tFAT_VolInfo *disk = Node->ImplPtr;
\r
821 Uint32 cluster, offset;
\r
828 ENTER("pNode iID", Node, ID);
\r
830 // Get Byte Offset and skip
\r
831 offset = ID * sizeof(fat_filetable);
\r
832 preSkip = offset / (512 * disk->bootsect.spc);
\r
833 LOG("disk->bootsect.spc = %i", disk->bootsect.spc);
\r
834 LOG("Node->size = %i", Node->Size);
\r
835 cluster = Node->Inode & 0xFFFFFFFF; // Cluster ID
\r
838 // - Pre FAT32 had a reserved area for the root.
\r
839 if( disk->type == FAT32 || cluster != disk->rootOffset )
\r
841 //Skip previous clusters
\r
842 for(a=preSkip;a--;) {
\r
843 cluster = FAT_int_GetFatValue(disk, cluster);
\r
844 // Check for end of cluster chain
\r
845 if(cluster == -1) { LEAVE('n'); return NULL;}
\r
849 // Bounds Checking (Used to spot heap overflows)
\r
850 if(cluster > disk->ClusterCount + 2)
\r
852 Warning("FAT_ReadDir - Cluster ID is over cluster count (0x%x>0x%x)",
\r
853 cluster, disk->ClusterCount+2);
\r
858 LOG("cluster=0x%x, ID=%i", cluster, ID);
\r
861 // - Pre FAT32 cluster base (in sectors)
\r
862 if( cluster == disk->rootOffset && disk->type != FAT32 )
\r
863 offset = disk->bootsect.resvSectCount + cluster*disk->bootsect.spc;
\r
865 { // FAT32 cluster base (in sectors)
\r
866 offset = disk->firstDataSect;
\r
867 offset += (cluster - 2) * disk->bootsect.spc;
\r
869 // Sector in cluster
\r
870 if(disk->bootsect.spc != 1)
\r
871 offset += (ID / 16) % disk->bootsect.spc;
\r
872 // Offset in sector
\r
875 LOG("offset=%i, a=%i", offset, a);
\r
878 VFS_ReadAt(disk->fileHandle, offset*512, 512, fileinfo); // Read Dir Data
\r
880 LOG("name[0] = 0x%x", (Uint8)fileinfo[a].name[0]);
\r
881 //Check if this is the last entry
\r
882 if( fileinfo[a].name[0] == '\0' ) {
\r
884 LOG("End of list");
\r
886 return NULL; // break
\r
889 // Check for empty entry
\r
890 if( (Uint8)fileinfo[a].name[0] == 0xE5 ) {
\r
891 LOG("Empty Entry");
\r
892 LEAVE('p', VFS_SKIP);
\r
893 return VFS_SKIP; // Skip
\r
897 // Get Long File Name Cache
\r
898 lfn = FAT_int_GetLFN(Node);
\r
899 if(fileinfo[a].attrib == ATTR_LFN)
\r
901 fat_longfilename *lfnInfo;
\r
904 lfnInfo = (fat_longfilename *) &fileinfo[a];
\r
905 if(lfnInfo->id & 0x40) memset(lfn, 0, 256);
\r
906 // Get the current length
\r
909 // Sanity Check (FAT implementations should not allow >255 bytes)
\r
910 if(len + 13 > 255) return VFS_SKIP;
\r
911 // Rebase all bytes
\r
912 for(a=len+1;a--;) lfn[a+13] = lfn[a];
\r
914 // Append new bytes
\r
915 lfn[ 0] = lfnInfo->name1[0]; lfn[ 1] = lfnInfo->name1[1];
\r
916 lfn[ 2] = lfnInfo->name1[2]; lfn[ 3] = lfnInfo->name1[3];
\r
917 lfn[ 4] = lfnInfo->name1[4];
\r
918 lfn[ 5] = lfnInfo->name2[0]; lfn[ 6] = lfnInfo->name2[1];
\r
919 lfn[ 7] = lfnInfo->name2[2]; lfn[ 8] = lfnInfo->name2[3];
\r
920 lfn[ 9] = lfnInfo->name2[4]; lfn[10] = lfnInfo->name2[5];
\r
921 lfn[11] = lfnInfo->name3[0]; lfn[12] = lfnInfo->name3[1];
\r
922 LEAVE('p', VFS_SKIP);
\r
927 //Check if it is a volume entry
\r
928 if(fileinfo[a].attrib & 0x08) {
\r
929 LEAVE('p', VFS_SKIP);
\r
933 if(fileinfo[a].name[0] == '.') {
\r
934 LEAVE('p', VFS_SKIP);
\r
938 LOG("name='%c%c%c%c%c%c%c%c.%c%c%c'\n",
\r
939 fileinfo[a].name[0], fileinfo[a].name[1], fileinfo[a].name[2], fileinfo[a].name[3],
\r
940 fileinfo[a].name[4], fileinfo[a].name[5], fileinfo[a].name[6], fileinfo[a].name[7],
\r
941 fileinfo[a].name[8], fileinfo[a].name[9], fileinfo[a].name[10] );
\r
944 //node = FAT_int_CreateNode(Node, &fileinfo[a], lfn);
\r
945 ret = FAT_int_CreateName(Node, &fileinfo[a], lfn);
\r
948 //node = FAT_int_CreateNode(Node, &fileinfo[a], NULL);
\r
949 ret = FAT_int_CreateName(Node, &fileinfo[a], NULL);
\r
957 * \fn tVFS_Node *FAT_FindDir(tVFS_Node *node, char *name)
\r
958 * \brief Finds an entry in the current directory
\r
960 tVFS_Node *FAT_FindDir(tVFS_Node *Node, char *name)
\r
962 fat_filetable fileinfo[16];
\r
965 fat_longfilename *lfnInfo;
\r
967 int lfnPos=255, lfnId = -1;
\r
970 tVFS_Node *tmpNode;
\r
972 tFAT_VolInfo *disk = Node->ImplPtr;
\r
976 ENTER("pNode sname", Node, name);
\r
979 if(!name || name[0] == '\0') {
\r
985 lfn = FAT_int_GetLFN(Node);
\r
988 dirCluster = Node->Inode & 0xFFFFFFFF;
\r
989 // Seek to Directory
\r
990 if( dirCluster == disk->rootOffset && disk->type != FAT32 )
\r
991 diskOffset = (disk->bootsect.resvSectCount+dirCluster*disk->bootsect.spc) << 9;
\r
993 diskOffset = (disk->firstDataSect+(dirCluster-2)*disk->bootsect.spc) << 9;
\r
998 if((i & 0xF) == 0) {
\r
999 //Log("FAT_FindDir: diskOffset = 0x%x", diskOffset);
\r
1000 VFS_ReadAt(disk->fileHandle, diskOffset, 512, fileinfo);
\r
1001 diskOffset += 512;
\r
1004 //Check if the files are free
\r
1005 if(fileinfo[i&0xF].name[0] == '\0') break; //Free and last
\r
1006 if(fileinfo[i&0xF].name[0] == '\xE5') goto loadCluster; //Free
\r
1010 // Long File Name Entry
\r
1011 if(fileinfo[i&0xF].attrib == ATTR_LFN)
\r
1013 lfnInfo = (fat_longfilename *) &fileinfo[i&0xF];
\r
1014 if(lfnInfo->id & 0x40) {
\r
1015 memset(lfn, 0, 256);
\r
1018 lfn[lfnPos--] = lfnInfo->name3[1]; lfn[lfnPos--] = lfnInfo->name3[0];
\r
1019 lfn[lfnPos--] = lfnInfo->name2[5]; lfn[lfnPos--] = lfnInfo->name2[4];
\r
1020 lfn[lfnPos--] = lfnInfo->name2[3]; lfn[lfnPos--] = lfnInfo->name2[2];
\r
1021 lfn[lfnPos--] = lfnInfo->name2[1]; lfn[lfnPos--] = lfnInfo->name2[0];
\r
1022 lfn[lfnPos--] = lfnInfo->name1[4]; lfn[lfnPos--] = lfnInfo->name1[3];
\r
1023 lfn[lfnPos--] = lfnInfo->name1[2]; lfn[lfnPos--] = lfnInfo->name1[1];
\r
1024 lfn[lfnPos--] = lfnInfo->name1[0];
\r
1025 if((lfnInfo->id&0x3F) == 1)
\r
1027 memcpy(lfn, lfn+lfnPos+1, 256-lfnPos);
\r
1033 // Remove LFN if it does not apply
\r
1034 if(lfnId != i) lfn[0] = '\0';
\r
1036 // Get Real Filename
\r
1037 FAT_int_ProperFilename(tmpName, fileinfo[i&0xF].name);
\r
1039 LOG("tmpName = '%s'", tmpName);
\r
1041 //Only Long name is case sensitive, 8.3 is not
\r
1043 if(strucmp(tmpName, name) == 0 || strcmp(lfn, name) == 0) {
\r
1045 if(strucmp(tmpName, name) == 0) {
\r
1047 cluster = fileinfo[i&0xF].cluster | (fileinfo[i&0xF].clusterHi << 16);
\r
1048 tmpNode = Inode_GetCache(disk->inodeHandle, cluster);
\r
1049 if(tmpNode == NULL) // Node is not cached
\r
1052 tmpNode = FAT_int_CreateNode(Node, &fileinfo[i&0xF], lfn);
\r
1054 tmpNode = FAT_int_CreateNode(Node, &fileinfo[i&0xF], NULL);
\r
1060 LEAVE('p', tmpNode);
\r
1068 //Load Next cluster?
\r
1069 if( ((i+1) >> 4) % disk->bootsect.spc == 0 && ((i+1) & 0xF) == 0)
\r
1071 if( dirCluster == disk->rootOffset && disk->type != FAT32 )
\r
1073 dirCluster = FAT_int_GetFatValue(disk, dirCluster);
\r
1074 if(dirCluster == -1) break;
\r
1075 diskOffset = (disk->firstDataSect+(dirCluster-2)*disk->bootsect.spc)*512;
\r
1084 * \fn int FAT_Mknod(tVFS_Node *Node, char *Name, Uint Flags)
\r
1085 * \brief Create a new node
\r
1087 int FAT_Mknod(tVFS_Node *Node, char *Name, Uint Flags)
\r
1093 * \fn int FAT_Relink(tVFS_Node *Node, char *OldName, char *NewName)
\r
1094 * \brief Rename / Delete a file
\r
1096 int FAT_Relink(tVFS_Node *Node, char *OldName, char *NewName)
\r
1102 * \fn void FAT_CloseFile(tVFS_Node *Node)
\r
1103 * \brief Close an open file
\r
1105 void FAT_CloseFile(tVFS_Node *Node)
\r
1107 tFAT_VolInfo *disk = Node->ImplPtr;
\r
1108 if(Node == NULL) return ;
\r
1110 Inode_UncacheNode(disk->inodeHandle, Node->Inode);
\r
1112 // If node has been uncached and is a directory, delete the LFN cache
\r
1113 if( !Inode_GetCache(disk->inodeHandle, Node->Inode) && Node->Flags & VFS_FFLAG_DIRECTORY)
\r
1114 FAT_int_DelLFN(Node);
\r
1115 else // Get Cache references the node, so dereference it
\r
1116 Inode_UncacheNode(disk->inodeHandle, Node->Inode);
\r
1122 * \fn void fat_install()
\r
1123 * \brief Add the FAT Filesystem to the VFS
\r
1125 void fat_install()
\r
1127 VFS_AddDriver( &gFAT_FSInfo );
\r