3 * FAT12/16/32 Driver Version (Incl LFN)
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5 * NOTE: This driver will only support _reading_ long file names, not
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6 * writing. I don't even know why i'm adding write-support. FAT sucks.
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9 * - LFN Is buggy in FAT_ReadDir
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12 * \todo Implement changing of the parent directory when a file is written to
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13 * \todo Implement file creation / deletion
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18 #define CACHE_FAT 1 //!< Caches the FAT in memory
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19 #define USE_LFN 1 //!< Enables the use of Long File Names
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20 #define SUPPORT_WRITE 0
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23 #include <modules.h>
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27 #define FAT_FLAG_DIRTY 0x10000
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28 #define FAT_FLAG_DELETE 0x20000
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32 typedef struct s_lfncache
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38 struct s_lfncache *Next;
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42 // === PROTOTYPES ===
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43 int FAT_Install(char **Arguments);
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44 tVFS_Node *FAT_InitDevice(char *device, char **options);
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45 void FAT_Unmount(tVFS_Node *Node);
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47 Uint32 FAT_int_GetFatValue(tFAT_VolInfo *Disk, Uint32 Cluster);
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48 Uint32 FAT_int_AllocateCluster(tFAT_VolInfo *Disk, Uint32 Previous);
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50 void FAT_int_ReadCluster(tFAT_VolInfo *Disk, Uint32 Cluster, int Length, void *Buffer);
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51 Uint64 FAT_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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53 void FAT_int_WriteCluster(tFAT_VolInfo *Disk, Uint32 Cluster, void *Buffer);
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54 Uint64 FAT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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57 char *FAT_ReadDir(tVFS_Node *Node, int ID);
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58 tVFS_Node *FAT_FindDir(tVFS_Node *Node, char *Name);
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59 int FAT_Mknod(tVFS_Node *Node, char *Name, Uint Flags);
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60 int FAT_Relink(tVFS_Node *node, char *OldName, char *NewName);
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61 void FAT_CloseFile(tVFS_Node *node);
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63 // === SEMI-GLOBALS ===
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64 MODULE_DEFINE(0, (0<<8)|50 /*v0.50*/, VFAT, FAT_Install, NULL, NULL);
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65 tFAT_VolInfo gFAT_Disks[8];
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66 int giFAT_PartCount = 0;
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68 t_lfncache *fat_lfncache;
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70 tVFS_Driver gFAT_FSInfo = {"fat", 0, FAT_InitDevice, FAT_Unmount, NULL};
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74 * \fn int FAT_Install(char **Arguments)
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77 int FAT_Install(char **Arguments)
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79 VFS_AddDriver( &gFAT_FSInfo );
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80 return MODULE_ERR_OK;
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84 * \fn tVFS_Node *FAT_InitDevice(char *Device, char **Options)
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85 * \brief Reads the boot sector of a disk and prepares the structures for it
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87 tVFS_Node *FAT_InitDevice(char *Device, char **Options)
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91 Uint32 FATSz, RootDirSectors, TotSec;
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92 tVFS_Node *node = NULL;
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93 tFAT_VolInfo *diskInfo = &gFAT_Disks[giFAT_PartCount];
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95 // Temporary Pointer
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96 bs = &diskInfo->bootsect;
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98 //Open device and read boot sector
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99 diskInfo->fileHandle = VFS_Open(Device, VFS_OPENFLAG_READ|VFS_OPENFLAG_WRITE);
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100 if(diskInfo->fileHandle == -1) {
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101 Log_Notice("FAT", "Unable to open device '%s'", Device);
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105 VFS_ReadAt(diskInfo->fileHandle, 0, 512, bs);
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107 if(bs->bps == 0 || bs->spc == 0) {
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108 Log_Notice("FAT", "Error in FAT Boot Sector\n");
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112 // FAT Type Determining
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113 // - From Microsoft FAT Specifcation
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114 RootDirSectors = ((bs->files_in_root*32) + (bs->bps - 1)) / bs->bps;
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116 if(bs->fatSz16 != 0) FATSz = bs->fatSz16;
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117 else FATSz = bs->spec.fat32.fatSz32;
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119 if(bs->totalSect16 != 0) TotSec = bs->totalSect16;
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120 else TotSec = bs->totalSect32;
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122 diskInfo->ClusterCount = (TotSec - (bs->resvSectCount + (bs->fatCount * FATSz) + RootDirSectors)) / bs->spc;
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124 if(diskInfo->ClusterCount < 4085)
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125 diskInfo->type = FAT12;
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126 else if(diskInfo->ClusterCount < 65525)
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127 diskInfo->type = FAT16;
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129 diskInfo->type = FAT32;
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133 char *sFatType, *sSize;
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134 Uint iSize = diskInfo->ClusterCount * bs->spc * bs->bps / 1024;
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136 switch(diskInfo->type)
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138 case FAT12: sFatType = "FAT12"; break;
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139 case FAT16: sFatType = "FAT16"; break;
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140 case FAT32: sFatType = "FAT32"; break;
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141 default: sFatType = "UNKNOWN"; break;
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143 if(iSize <= 2*1024) {
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146 else if(iSize <= 2*1024*1024) {
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154 Log_Notice("FAT", "'%s' %s, %i %s", Device, sFatType, iSize, sSize);
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159 if(diskInfo->type == FAT32) {
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161 diskInfo->name[i] = (bs->spec.fat32.label[i] == ' ' ? '\0' : bs->spec.fat32.label[i]);
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165 diskInfo->name[i] = (bs->spec.fat16.label[i] == ' ' ? '\0' : bs->spec.fat16.label[i]);
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167 diskInfo->name[11] = '\0';
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169 // Compute Root directory offset
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170 if(diskInfo->type == FAT32)
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171 diskInfo->rootOffset = bs->spec.fat32.rootClust;
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173 diskInfo->rootOffset = (FATSz * bs->fatCount) / bs->spc;
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175 diskInfo->firstDataSect = bs->resvSectCount + (bs->fatCount * FATSz) + RootDirSectors;
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177 //Allow for Caching the FAT
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181 diskInfo->FATCache = (Uint32*)malloc(sizeof(Uint32)*diskInfo->ClusterCount);
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182 if(diskInfo->FATCache == NULL) {
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183 Log_Warning("FAT", "Heap Exhausted\n");
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186 Ofs = bs->resvSectCount*512;
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187 if(diskInfo->type == FAT12)
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192 for(i = 0; i < diskInfo->ClusterCount/2; i++) {
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193 j = i & 511; //%512
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195 VFS_ReadAt(diskInfo->fileHandle, Ofs, 3*512, buf);
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198 val = *((int*)(buf+j*3));
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199 diskInfo->FATCache[i*2] = val & 0xFFF;
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200 diskInfo->FATCache[i*2+1] = (val>>12) & 0xFFF;
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203 else if(diskInfo->type == FAT16)
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206 for(i=0;i<diskInfo->ClusterCount;i++) {
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207 if( (i & 255) == 0 ) {
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208 VFS_ReadAt(diskInfo->fileHandle, Ofs, 512, buf);
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211 diskInfo->FATCache[i] = buf[i&255];
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214 else if(diskInfo->type == FAT32)
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217 for(i=0;i<diskInfo->ClusterCount;i++) {
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218 if( (i & 127) == 0 ) {
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219 VFS_ReadAt(diskInfo->fileHandle, Ofs, 512, buf);
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222 diskInfo->FATCache[i] = buf[i&127];
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225 LOG("FAT Fully Cached");
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227 #endif /*CACHE_FAT*/
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229 diskInfo->BytesPerCluster = bs->spc * bs->bps;
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231 // Initalise inode cache for filesystem
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232 diskInfo->inodeHandle = Inode_GetHandle();
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233 LOG("Inode Cache handle is %i", diskInfo->inodeHandle);
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235 // == VFS Interface
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236 node = &diskInfo->rootNode;
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237 node->Size = bs->files_in_root;
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238 node->Inode = diskInfo->rootOffset; // 0:31 - Cluster, 32:63 - Parent Directory Cluster
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239 node->ImplPtr = diskInfo; // Disk info pointer
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240 node->ImplInt = 0; // 0:15 - Directory Index, 16: Dirty Flag, 17: Deletion Flag
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242 node->ReferenceCount = 1;
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244 node->UID = 0; node->GID = 0;
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246 node->ACLs = &gVFS_ACL_EveryoneRWX;
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247 node->Flags = VFS_FFLAG_DIRECTORY;
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248 node->CTime = node->MTime = node->ATime = now();
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250 node->Read = node->Write = NULL;
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251 node->ReadDir = FAT_ReadDir;
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252 node->FindDir = FAT_FindDir;
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254 node->Relink = FAT_Relink;
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255 node->MkNod = FAT_Mknod;
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257 node->Relink = NULL;
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258 node->MkNod = NULL;
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260 //node->Close = FAT_Unmount;
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262 giFAT_PartCount ++;
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267 * \brief Closes a mount and marks it as free
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268 * \param Node Mount Root
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270 * \todo Remove FAT Cache
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271 * \todo Clear LFN Cache
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272 * \todo Check that all files are closed and flushed
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274 void FAT_Unmount(tVFS_Node *Node)
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276 tFAT_VolInfo *disk = Node->ImplPtr;
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278 // Close Disk Handle
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279 VFS_Close( disk->fileHandle );
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280 // Clear Node Cache
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281 Inode_ClearCache(disk->inodeHandle);
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283 disk->fileHandle = -2;
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288 * \brief Converts an offset in a file into a disk address
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289 * \param Node File (or directory) node
\r
290 * \param Offset Offset in the file
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291 * \param Addr Return Address
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292 * \param Cluster Set to the current cluster (or the last one if \a Offset
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293 * is past EOC) - Not touched if the node is the root
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295 * \return Zero on success, non-zero on error
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297 int FAT_int_GetAddress(tVFS_Node *Node, Uint64 Offset, Uint64 *Addr, Uint32 *Cluster)
\r
302 tFAT_VolInfo *disk = Node->ImplPtr;
\r
304 ENTER("pNode XOffset", Node, Offset);
\r
306 cluster = Node->Inode & 0xFFFFFFFF; // Cluster ID
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307 LOG("cluster = %08x", cluster);
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310 // - Pre FAT32 had a reserved area for the root.
\r
311 if( disk->type == FAT32 || cluster != disk->rootOffset )
\r
313 skip = Offset / disk->BytesPerCluster;
\r
314 LOG("skip = %i", skip);
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315 // Skip previous clusters
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318 if(Cluster) *Cluster = cluster;
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319 cluster = FAT_int_GetFatValue(disk, cluster);
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320 // Check for end of cluster chain
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321 if(cluster == -1) { LEAVE('i', 1); return 1;}
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323 if(Cluster) *Cluster = cluster;
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326 // Bounds Checking (Used to spot corruption)
\r
327 if(cluster > disk->ClusterCount + 2)
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329 Log_Warning("FAT", "Cluster ID is over cluster count (0x%x>0x%x)",
\r
330 cluster, disk->ClusterCount+2);
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336 // - Pre FAT32 cluster base (in sectors)
\r
337 if( cluster == disk->rootOffset && disk->type != FAT32 ) {
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338 addr = disk->bootsect.resvSectCount * disk->bootsect.bps;
\r
339 addr += cluster * disk->BytesPerCluster;
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342 addr = disk->firstDataSect * disk->bootsect.bps;
\r
343 addr += (cluster - 2) * disk->BytesPerCluster;
\r
345 addr += Offset % disk->BytesPerCluster;
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347 LOG("addr = 0x%08x", addr);
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354 * ====================
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356 * ====================
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359 * \fn Uint32 FAT_int_GetFatValue(tFAT_VolInfo *Disk, Uint32 cluster)
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360 * \brief Fetches a value from the FAT
\r
362 Uint32 FAT_int_GetFatValue(tFAT_VolInfo *Disk, Uint32 cluster)
\r
366 Uint32 ofs = Disk->bootsect.resvSectCount*512;
\r
368 ENTER("pDisk xCluster", Disk, cluster);
\r
369 LOCK( &Disk->lFAT );
\r
371 val = Disk->FATCache[cluster];
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372 if(Disk->type == FAT12 && val == EOC_FAT12) val = -1;
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373 if(Disk->type == FAT16 && val == EOC_FAT16) val = -1;
\r
374 if(Disk->type == FAT32 && val == EOC_FAT32) val = -1;
\r
376 if(Disk->type == FAT12) {
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377 VFS_ReadAt(Disk->fileHandle, ofs+(cluster>>1)*3, 3, &val);
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378 val = (cluster&1 ? val&0xFFF : val>>12);
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379 if(val == EOC_FAT12) val = -1;
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380 } else if(Disk->type == FAT16) {
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381 VFS_ReadAt(Disk->fileHandle, ofs+cluster*2, 2, &val);
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382 if(val == EOC_FAT16) val = -1;
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384 VFS_ReadAt(Disk->fileHandle, ofs+cluster*4, 4, &val);
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385 if(val == EOC_FAT32) val = -1;
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387 #endif /*CACHE_FAT*/
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388 RELEASE( &Disk->lFAT );
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395 * \brief Allocate a new cluster
\r
397 Uint32 FAT_int_AllocateCluster(tFAT_VolInfo *Disk, Uint32 Previous)
\r
399 Uint32 ret = Previous;
\r
404 for(ret = Previous; ret < Disk->ClusterCount; ret++)
\r
406 if(Disk->FATCache[ret] == 0)
\r
409 for(ret = 0; ret < Previous; ret++)
\r
411 if(Disk->FATCache[ret] == 0)
\r
415 RELEASE(Disk->lFAT);
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421 case FAT12: eoc = EOC_FAT12; break;
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422 case FAT16: eoc = EOC_FAT16; break;
\r
423 case FAT32: eoc = EOC_FAT32; break;
\r
427 Disk->FATCache[ret] = eoc;
\r
428 Disk->FATCache[Previous] = ret;
\r
430 RELEASE(Disk->lFAT);
\r
435 Log_Warning("FAT", "TODO: Implement cluster allocation with non cached FAT");
\r
441 VFS_ReadAt(Disk->fileHandle, ofs+(Previous>>1)*3, 3, &val);
\r
442 if( Previous & 1 ) {
\r
450 VFS_WriteAt(Disk->fileHandle, ofs+(Previous>>1)*3, 3, &val);
\r
452 VFS_ReadAt(Disk->fileHandle, ofs+(ret>>1)*3, 3, &val);
\r
453 if( Cluster & 1 ) {
\r
461 VFS_WriteAt(Disk->fileHandle, ofs+(ret>>1)*3, 3, &val);
\r
464 VFS_ReadAt(Disk->fileHandle, ofs+Previous*2, 2, &ret);
\r
465 VFS_WriteAt(Disk->fileHandle, ofs+ret*2, 2, &eoc);
\r
468 VFS_ReadAt(Disk->fileHandle, ofs+Previous*4, 4, &ret);
\r
469 VFS_WriteAt(Disk->fileHandle, ofs+ret*4, 4, &eoc);
\r
477 * \brief Free's a cluster
\r
478 * \return The original contents of the cluster
\r
480 Uint32 FAT_int_FreeCluster(tFAT_VolInfo *Disk, Uint32 Cluster)
\r
486 ret = Disk->FATCache[Cluster];
\r
487 Disk->FATCache[Cluster] = 0;
\r
489 RELEASE(Disk->lFAT);
\r
496 VFS_ReadAt(Disk->fileHandle, ofs+(Cluster>>1)*3, 3, &val);
\r
497 if( Cluster & 1 ) {
\r
498 ret = val & 0xFFF0000;
\r
505 VFS_WriteAt(Disk->fileHandle, ofs+(Previous>>1)*3, 3, &val);
\r
508 VFS_ReadAt(Disk->fileHandle, ofs+Previous*2, 2, &ret);
\r
510 VFS_WriteAt(Disk->fileHandle, ofs+Cluster*2, 2, &val);
\r
513 VFS_ReadAt(Disk->fileHandle, ofs+Previous*4, 4, &ret);
\r
515 VFS_WriteAt(Disk->fileHandle, ofs+Cluster*2, 2, &val);
\r
518 RELEASE(Disk->lFAT);
\r
520 if(Disk->type == FAT12 && ret == EOC_FAT12) ret = -1;
\r
521 if(Disk->type == FAT16 && ret == EOC_FAT16) ret = -1;
\r
522 if(Disk->type == FAT32 && ret == EOC_FAT32) ret = -1;
\r
528 * ====================
\r
530 * ====================
\r
533 * \brief Read a cluster
\r
535 void FAT_int_ReadCluster(tFAT_VolInfo *Disk, Uint32 Cluster, int Length, void *Buffer)
\r
537 ENTER("pDisk xCluster iLength pBuffer", Disk, Cluster, Length, Buffer);
\r
538 //Log("Cluster = %i (0x%x)", Cluster, Cluster);
\r
541 (Disk->firstDataSect + (Cluster-2)*Disk->bootsect.spc )
\r
542 * Disk->bootsect.bps,
\r
549 /* ====================
\r
551 * ====================
\r
554 * \fn Uint64 FAT_Read(tVFS_Node *node, Uint64 offset, Uint64 length, void *buffer)
\r
555 * \brief Reads data from a specified file
\r
557 Uint64 FAT_Read(tVFS_Node *Node, Uint64 offset, Uint64 length, void *buffer)
\r
559 int preSkip, count;
\r
560 int i, cluster, pos;
\r
563 tFAT_VolInfo *disk = Node->ImplPtr;
\r
565 ENTER("pNode Xoffset Xlength pbuffer", Node, offset, length, buffer);
\r
567 // Calculate and Allocate Bytes Per Cluster
\r
568 bpc = disk->BytesPerCluster;
\r
569 tmpBuf = (void*) malloc(bpc);
\r
570 if( !tmpBuf ) return 0;
\r
572 // Cluster is stored in Inode Field
\r
573 cluster = Node->Inode & 0xFFFFFFFF;
\r
575 // Sanity Check offset
\r
576 if(offset > Node->Size) {
\r
577 //LOG("Reading past EOF (%i > %i)", offset, node->Size);
\r
582 if(offset + length > Node->Size) {
\r
583 //LOG("Reading past EOF (%lli + %lli > %lli), clamped to %lli",
\r
584 // offset, length, node->Size, node->Size - offset);
\r
585 length = Node->Size - offset;
\r
588 // Single Cluster including offset
\r
589 if(length + offset < bpc)
\r
591 FAT_int_ReadCluster(disk, cluster, bpc, tmpBuf);
\r
592 memcpy( buffer, (void*)( tmpBuf + offset%bpc ), length );
\r
599 if( FAT_int_GetAddress(Node, offset, &addr) )
\r
601 Log_Warning("FAT", "Offset is past end of cluster chain mark");
\r
607 preSkip = offset / bpc;
\r
609 //Skip previous clusters
\r
610 for(i=preSkip;i--;) {
\r
611 cluster = FAT_int_GetFatValue(disk, cluster);
\r
612 if(cluster == -1) {
\r
613 Log_Warning("FAT", "Offset is past end of cluster chain mark");
\r
619 // Get Count of Clusters to read
\r
620 count = ((offset%bpc+length) / bpc) + 1;
\r
622 // Get buffer Position after 1st cluster
\r
623 pos = bpc - offset%bpc;
\r
625 // Read 1st Cluster
\r
626 FAT_int_ReadCluster(disk, cluster, bpc, tmpBuf);
\r
629 (void*)( tmpBuf + (bpc-pos) ),
\r
630 (pos < length ? pos : length)
\r
639 cluster = FAT_int_GetFatValue(disk, cluster);
\r
642 LOG("pos=%i\n", pos);
\r
643 LOG("Reading the rest of the clusters\n");
\r
647 //Read the rest of the cluster data
\r
648 for( i = 1; i < count-1; i++ )
\r
650 FAT_int_ReadCluster(disk, cluster, bpc, tmpBuf);
\r
651 memcpy((void*)(buffer+pos), tmpBuf, bpc);
\r
653 cluster = FAT_int_GetFatValue(disk, cluster);
\r
654 if(cluster == -1) {
\r
655 Warning("FAT_Read - Read past End of Cluster Chain");
\r
662 FAT_int_ReadCluster(disk, cluster, bpc, tmpBuf);
\r
663 memcpy((void*)(buffer+pos), tmpBuf, length-pos);
\r
666 LOG("Free tmpBuf(0x%x) and Return\n", tmpBuf);
\r
670 LEAVE('X', length);
\r
676 * \brief Write a cluster to disk
\r
678 void FAT_int_WriteCluster(tFAT_VolInfo *Disk, Uint32 Cluster, void *Buffer)
\r
680 ENTER("pDisk xCluster pBuffer", Disk, Cluster, Buffer);
\r
683 (Disk->firstDataSect + (Cluster-2)*Disk->bootsect.spc )
\r
684 * Disk->bootsect.bps,
\r
685 Disk->BytesPerCluster,
\r
692 * \brief Write to a file
\r
693 * \param Node File Node
\r
694 * \param Offset Offset within file
\r
695 * \param Length Size of data to write
\r
696 * \param Buffer Data source
\r
698 Uint64 FAT_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
\r
700 tFAT_VolInfo *disk = Node->ImplPtr;
\r
702 int remLength = Length;
\r
703 Uint32 cluster, tmpCluster;
\r
704 int bNewCluster = 0;
\r
706 if(Offset > Node->Size) return 0;
\r
709 cluster = Node->Inode & 0xFFFFFFFF;
\r
710 while( Offset > disk->BytesPerCluster )
\r
712 cluster = FAT_int_GetFatValue( disk, cluster );
\r
713 if(cluster == -1) {
\r
714 Log_Warning("FAT", "EOC Unexpectedly Reached");
\r
717 Offset -= disk->BytesPerCluster;
\r
719 if( Offset == disk->BytesPerCluster )
\r
721 Uint32 tmp = FAT_int_AllocateCluster(disk, cluster);
\r
724 Offset -= disk->BytesPerCluster;
\r
727 if( Offset + Length < disk->BytesPerCluster )
\r
729 tmpBuf = malloc( disk->BytesPerCluster );
\r
731 // Read-Modify-Write
\r
732 FAT_int_ReadCluster( disk, cluster, disk->BytesPerCluster, tmpBuf );
\r
733 memcpy( tmpBuf + Offset, Buffer, Length );
\r
734 FAT_int_WriteCluster( disk, cluster, tmpBuf );
\r
740 // Clean up changes within a cluster
\r
743 tmpBuf = malloc( disk->BytesPerCluster );
\r
745 // Read-Modify-Write
\r
746 FAT_int_ReadCluster( disk, cluster, disk->BytesPerCluster, tmpBuf );
\r
747 memcpy( tmpBuf + Offset, Buffer, disk->BytesPerCluster - Offset );
\r
748 FAT_int_WriteCluster( disk, cluster, tmpBuf );
\r
752 remLength -= disk->BytesPerCluster - Offset;
\r
753 Buffer += disk->BytesPerCluster - Offset;
\r
755 // Get next cluster (allocating if needed)
\r
756 tmpCluster = FAT_int_GetFatValue(disk, cluster);
\r
757 if(tmpCluster == -1) {
\r
758 tmpCluster = FAT_int_AllocateCluster(disk, cluster);
\r
759 if( tmpCluster == 0 ) {
\r
760 return Length - remLength;
\r
763 cluster = tmpCluster;
\r
766 while( remLength > disk->BytesPerCluster )
\r
768 FAT_int_WriteCluster( disk, cluster, Buffer );
\r
769 Buffer += disk->BytesPerCluster;
\r
771 // Get next cluster (allocating if needed)
\r
772 tmpCluster = FAT_int_GetFatValue(disk, cluster);
\r
773 if(tmpCluster == -1) {
\r
775 tmpCluster = FAT_int_AllocateCluster(disk, cluster);
\r
776 if( tmpCluster == 0 ) {
\r
777 return Length - remLength;
\r
780 cluster = tmpCluster;
\r
784 tmpBuf = malloc( disk->BytesPerCluster );
\r
786 memset(tmpBuf, 0, disk->BytesPerCluster);
\r
788 FAT_int_ReadCluster( disk, cluster, disk->BytesPerCluster, tmpBuf );
\r
789 memcpy( tmpBuf, Buffer, remLength );
\r
790 FAT_int_WriteCluster( disk, cluster, tmpBuf );
\r
797 /* ====================
\r
798 * File Names & Nodes
\r
799 * ====================
\r
802 * \fn void FAT_int_ProperFilename(char *dest, char *src)
\r
803 * \brief Converts a FAT directory entry name into a proper filename
\r
805 void FAT_int_ProperFilename(char *dest, char *src)
\r
809 for( a = 0; a < 8; a++) {
\r
810 if(src[a] == ' ') break;
\r
817 for( ; a < 11; a++, b++) {
\r
818 if(src[a] == ' ') break;
\r
823 //LOG("dest='%s'", dest);
\r
828 * \fn char *FAT_int_CreateName(fat_filetable *ft, char *LongFileName)
\r
829 * \brief Converts either a LFN or a 8.3 Name into a proper name
\r
831 char *FAT_int_CreateName(fat_filetable *ft, char *LongFileName)
\r
835 ENTER("pft sLongFileName", ft, LongFileName);
\r
837 if(LongFileName && LongFileName[0] != '\0')
\r
839 len = strlen(LongFileName);
\r
840 ret = malloc(len+1);
\r
841 strcpy(ret, LongFileName);
\r
846 ret = (char*) malloc(13);
\r
847 memset(ret, 13, '\0');
\r
848 FAT_int_ProperFilename(ret, ft->name);
\r
857 * \fn tVFS_Node *FAT_int_CreateNode(tVFS_Node *parent, fat_filetable *ft)
\r
858 * \brief Creates a tVFS_Node structure for a given file entry
\r
860 tVFS_Node *FAT_int_CreateNode(tVFS_Node *Parent, fat_filetable *Entry, int Pos)
\r
862 tVFS_Node node = {0};
\r
864 tFAT_VolInfo *disk = Parent->ImplPtr;
\r
866 ENTER("pParent pFT", Parent, Entry);
\r
869 node.Inode = Entry->cluster | (Entry->clusterHi<<16) | (Parent->Inode << 32);
\r
870 LOG("node.Inode = %llx", node.Inode);
\r
871 node.ImplInt = Pos & 0xFFFF;
\r
872 node.ImplPtr = disk;
\r
873 node.Size = Entry->size;
\r
874 LOG("Entry->size = %i", Entry->size);
\r
875 node.UID = 0; node.GID = 0;
\r
879 if(Entry->attrib & ATTR_DIRECTORY) node.Flags |= VFS_FFLAG_DIRECTORY;
\r
880 if(Entry->attrib & ATTR_READONLY) {
\r
881 node.Flags |= VFS_FFLAG_READONLY;
\r
882 node.ACLs = &gVFS_ACL_EveryoneRX; // R-XR-XR-X
\r
885 node.ACLs = &gVFS_ACL_EveryoneRWX; // RWXRWXRWX
\r
888 node.ATime = timestamp(0,0,0,
\r
889 ((Entry->adate&0x1F) - 1), // Days
\r
890 ((Entry->adate&0x1E0) - 1), // Months
\r
891 1980+((Entry->adate&0xFF00)>>8) // Years
\r
894 node.CTime = Entry->ctimems * 10; // Miliseconds
\r
895 node.CTime += timestamp(
\r
896 ((Entry->ctime&0x1F)<<1), // Seconds
\r
897 ((Entry->ctime&0x3F0)>>5), // Minutes
\r
898 ((Entry->ctime&0xF800)>>11), // Hours
\r
899 ((Entry->cdate&0x1F)-1), // Days
\r
900 ((Entry->cdate&0x1E0)-1), // Months
\r
901 1980+((Entry->cdate&0xFF00)>>8) // Years
\r
904 node.MTime = timestamp(
\r
905 ((Entry->mtime&0x1F)<<1), // Seconds
\r
906 ((Entry->mtime&0x3F0)>>5), // Minutes
\r
907 ((Entry->mtime&0xF800)>>11), // Hours
\r
908 ((Entry->mdate&0x1F)-1), // Days
\r
909 ((Entry->mdate&0x1E0)-1), // Months
\r
910 1980+((Entry->mdate&0xFF00)>>8) // Years
\r
913 if(node.Flags & VFS_FFLAG_DIRECTORY) {
\r
914 //Log_Debug("FAT", "Directory %08x has size 0x%x", node.Inode, node.Size);
\r
915 node.ReadDir = FAT_ReadDir;
\r
916 node.FindDir = FAT_FindDir;
\r
918 node.MkNod = FAT_Mknod;
\r
919 node.Relink = FAT_Relink;
\r
923 node.Read = FAT_Read;
\r
925 node.Write = FAT_Write;
\r
928 node.Close = FAT_CloseFile;
\r
930 ret = Inode_CacheNode(disk->inodeHandle, &node);
\r
935 /* ====================
\r
937 * ====================
\r
941 * \brief Reads a sector from the disk
\r
943 int FAT_int_ReadDirSector(tVFS_Node *Node, int Sector, fat_filetable *Buffer)
\r
946 tFAT_VolInfo *disk = Node->ImplPtr;
\r
948 ENTER("pNode iSector pEntry", Node, Sector, Buffer);
\r
950 if(FAT_int_GetAddress(Node, Sector * 512, &addr, NULL))
\r
957 if(VFS_ReadAt(disk->fileHandle, addr, 512, Buffer) != 512)
\r
969 * \brief Writes an entry to the disk
\r
970 * \todo Support expanding a directory
\r
971 * \return Zero on success, non-zero on error
\r
973 int FAT_int_WriteDirEntry(tVFS_Node *Node, int ID, fat_filetable *Entry)
\r
977 Uint32 cluster = 0;
\r
978 tFAT_VolInfo *disk = Node->ImplPtr;
\r
980 ENTER("pNode iID pEntry", Node, ID, Entry);
\r
982 tmp = FAT_int_GetAddress(Node, ID * sizeof(fat_filetable), &addr, &cluster);
\r
985 //TODO: Allocate a cluster
\r
986 cluster = FAT_int_AllocateCluster(Node->ImplPtr, cluster);
\r
987 if(cluster == -1) {
\r
988 Log_Warning("FAT", "Unable to allocate an other cluster for %p", Node);
\r
992 FAT_int_GetAddress(Node, ID * sizeof(fat_filetable), &addr, &cluster);
\r
996 LOG("addr = 0x%llx", addr);
\r
999 VFS_WriteAt(disk->fileHandle, addr, sizeof(fat_filetable), Entry); // Read Dir Data
\r
1007 // I should probably more tightly associate the LFN cache with the node
\r
1008 // somehow, maybe by adding a field to tVFS_Node before locking it
\r
1009 // Maybe .Cache or something like that (something that is free'd by the
\r
1010 // Inode_UncacheNode function)
\r
1013 * \fn char *FAT_int_GetLFN(tVFS_Node *node)
\r
1014 * \brief Return pointer to LFN cache entry
\r
1016 char *FAT_int_GetLFN(tVFS_Node *node)
\r
1019 tmp = fat_lfncache;
\r
1022 if(tmp->Inode == node->Inode && tmp->Disk == node->ImplPtr)
\r
1026 tmp = malloc(sizeof(t_lfncache));
\r
1027 tmp->Inode = node->Inode;
\r
1028 tmp->Disk = node->ImplPtr;
\r
1029 memset(tmp->Name, 0, 256);
\r
1031 tmp->Next = fat_lfncache;
\r
1032 fat_lfncache = tmp;
\r
1038 * \fn void FAT_int_DelLFN(tVFS_Node *node)
\r
1039 * \brief Delete a LFN cache entry
\r
1041 void FAT_int_DelLFN(tVFS_Node *node)
\r
1045 if(!fat_lfncache) return;
\r
1047 if(!fat_lfncache->Next)
\r
1049 tmp = fat_lfncache;
\r
1050 fat_lfncache = tmp->Next;
\r
1054 tmp = fat_lfncache;
\r
1055 while(tmp && tmp->Next)
\r
1057 if(tmp->Inode == node->Inode && tmp->Disk == node->ImplPtr)
\r
1060 tmp->Next = tmp->Next->Next;
\r
1069 * \fn char *FAT_ReadDir(tVFS_Node *Node, int ID)
\r
1070 * \param Node Node structure of directory
\r
1071 * \param ID Directory position
\r
1073 char *FAT_ReadDir(tVFS_Node *Node, int ID)
\r
1075 fat_filetable fileinfo[16]; //Sizeof=32, 16 per sector
\r
1082 ENTER("pNode iID", Node, ID);
\r
1084 if(FAT_int_ReadDirSector(Node, ID/16, fileinfo))
\r
1090 // Offset in sector
\r
1095 LOG("name[0] = 0x%x", (Uint8)fileinfo[a].name[0]);
\r
1097 // Check if this is the last entry
\r
1098 if( fileinfo[a].name[0] == '\0' ) {
\r
1100 LOG("End of list");
\r
1102 return NULL; // break
\r
1105 // Check for empty entry
\r
1106 if( (Uint8)fileinfo[a].name[0] == 0xE5 ) {
\r
1107 LOG("Empty Entry");
\r
1108 LEAVE('p', VFS_SKIP);
\r
1109 return VFS_SKIP; // Skip
\r
1113 // Get Long File Name Cache
\r
1114 lfn = FAT_int_GetLFN(Node);
\r
1115 if(fileinfo[a].attrib == ATTR_LFN)
\r
1117 fat_longfilename *lfnInfo;
\r
1120 lfnInfo = (fat_longfilename *) &fileinfo[a];
\r
1121 if(lfnInfo->id & 0x40) memset(lfn, 0, 256);
\r
1122 // Get the current length
\r
1123 len = strlen(lfn);
\r
1125 // Sanity Check (FAT implementations should not allow >255 bytes)
\r
1126 if(len + 13 > 255) return VFS_SKIP;
\r
1127 // Rebase all bytes
\r
1128 for(a=len+1;a--;) lfn[a+13] = lfn[a];
\r
1130 // Append new bytes
\r
1131 lfn[ 0] = lfnInfo->name1[0]; lfn[ 1] = lfnInfo->name1[1];
\r
1132 lfn[ 2] = lfnInfo->name1[2]; lfn[ 3] = lfnInfo->name1[3];
\r
1133 lfn[ 4] = lfnInfo->name1[4];
\r
1134 lfn[ 5] = lfnInfo->name2[0]; lfn[ 6] = lfnInfo->name2[1];
\r
1135 lfn[ 7] = lfnInfo->name2[2]; lfn[ 8] = lfnInfo->name2[3];
\r
1136 lfn[ 9] = lfnInfo->name2[4]; lfn[10] = lfnInfo->name2[5];
\r
1137 lfn[11] = lfnInfo->name3[0]; lfn[12] = lfnInfo->name3[1];
\r
1138 LOG("lfn = '%s'", lfn);
\r
1139 LEAVE('p', VFS_SKIP);
\r
1144 //Check if it is a volume entry
\r
1145 if(fileinfo[a].attrib & 0x08) {
\r
1146 LEAVE('p', VFS_SKIP);
\r
1149 // Ignore . and ..
\r
1150 if(fileinfo[a].name[0] == '.') {
\r
1151 LEAVE('p', VFS_SKIP);
\r
1155 LOG("name='%c%c%c%c%c%c%c%c.%c%c%c'",
\r
1156 fileinfo[a].name[0], fileinfo[a].name[1], fileinfo[a].name[2], fileinfo[a].name[3],
\r
1157 fileinfo[a].name[4], fileinfo[a].name[5], fileinfo[a].name[6], fileinfo[a].name[7],
\r
1158 fileinfo[a].name[8], fileinfo[a].name[9], fileinfo[a].name[10] );
\r
1161 ret = FAT_int_CreateName(&fileinfo[a], lfn);
\r
1164 ret = FAT_int_CreateName(&fileinfo[a], NULL);
\r
1172 * \fn tVFS_Node *FAT_FindDir(tVFS_Node *node, char *name)
\r
1173 * \brief Finds an entry in the current directory
\r
1175 tVFS_Node *FAT_FindDir(tVFS_Node *Node, char *Name)
\r
1177 fat_filetable fileinfo[16];
\r
1180 fat_longfilename *lfnInfo;
\r
1182 int lfnPos=255, lfnId = -1;
\r
1185 tVFS_Node *tmpNode;
\r
1186 tFAT_VolInfo *disk = Node->ImplPtr;
\r
1189 ENTER("pNode sname", Node, Name);
\r
1192 if(!Name || Name[0] == '\0') {
\r
1197 for( i = 0; ; i++ )
\r
1199 if((i & 0xF) == 0) {
\r
1200 if(FAT_int_ReadDirSector(Node, i/16, fileinfo))
\r
1207 //Check if the files are free
\r
1208 if(fileinfo[i&0xF].name[0] == '\0') break; // End of List marker
\r
1209 if(fileinfo[i&0xF].name[0] == '\xE5') continue; // Free entry
\r
1213 // Long File Name Entry
\r
1214 if(fileinfo[i&0xF].attrib == ATTR_LFN)
\r
1216 lfnInfo = (fat_longfilename *) &fileinfo[i&0xF];
\r
1217 if(lfnInfo->id & 0x40) {
\r
1218 memset(lfn, 0, 256);
\r
1221 lfn[lfnPos--] = lfnInfo->name3[1]; lfn[lfnPos--] = lfnInfo->name3[0];
\r
1222 lfn[lfnPos--] = lfnInfo->name2[5]; lfn[lfnPos--] = lfnInfo->name2[4];
\r
1223 lfn[lfnPos--] = lfnInfo->name2[3]; lfn[lfnPos--] = lfnInfo->name2[2];
\r
1224 lfn[lfnPos--] = lfnInfo->name2[1]; lfn[lfnPos--] = lfnInfo->name2[0];
\r
1225 lfn[lfnPos--] = lfnInfo->name1[4]; lfn[lfnPos--] = lfnInfo->name1[3];
\r
1226 lfn[lfnPos--] = lfnInfo->name1[2]; lfn[lfnPos--] = lfnInfo->name1[1];
\r
1227 lfn[lfnPos--] = lfnInfo->name1[0];
\r
1228 if((lfnInfo->id&0x3F) == 1)
\r
1230 memcpy(lfn, lfn+lfnPos+1, 256-lfnPos);
\r
1236 // Remove LFN if it does not apply
\r
1237 if(lfnId != i) lfn[0] = '\0';
\r
1239 // Get Real Filename
\r
1240 FAT_int_ProperFilename(tmpName, fileinfo[i&0xF].name);
\r
1241 LOG("tmpName = '%s'", tmpName);
\r
1243 // Only the long name is case sensitive, 8.3 is not
\r
1245 if(strucmp(tmpName, Name) == 0 || strcmp(lfn, Name) == 0)
\r
1247 if(strucmp(tmpName, Name) == 0)
\r
1250 cluster = fileinfo[i&0xF].cluster | (fileinfo[i&0xF].clusterHi << 16);
\r
1251 tmpNode = Inode_GetCache(disk->inodeHandle, cluster);
\r
1252 if(tmpNode == NULL) // Node is not cached
\r
1254 tmpNode = FAT_int_CreateNode(Node, &fileinfo[i&0xF], i);
\r
1256 LEAVE('p', tmpNode);
\r
1270 * \fn int FAT_Mknod(tVFS_Node *Node, char *Name, Uint Flags)
\r
1271 * \brief Create a new node
\r
1273 int FAT_Mknod(tVFS_Node *Node, char *Name, Uint Flags)
\r
1279 * \fn int FAT_Relink(tVFS_Node *Node, char *OldName, char *NewName)
\r
1280 * \brief Rename / Delete a file
\r
1282 int FAT_Relink(tVFS_Node *Node, char *OldName, char *NewName)
\r
1285 fat_filetable ft = {0};
\r
1288 child = FAT_FindDir(Node, OldName);
\r
1289 if(!child) return ENOTFOUND;
\r
1292 if( NewName == NULL )
\r
1294 child->ImplInt |= FAT_FLAG_DELETE; // Mark for deletion on close
\r
1296 // Delete from the directory
\r
1297 ft.name[0] = '\xE9';
\r
1298 FAT_int_WriteDirEntry(Node, child->ImplInt & 0xFFFF, &ft);
\r
1306 Log_Warning("FAT", "Renaming no yet supported %p ('%s' => '%s')",
\r
1307 Node, OldName, NewName);
\r
1312 child->Close( child );
\r
1318 * \fn void FAT_CloseFile(tVFS_Node *Node)
\r
1319 * \brief Close an open file
\r
1321 void FAT_CloseFile(tVFS_Node *Node)
\r
1323 tFAT_VolInfo *disk = Node->ImplPtr;
\r
1324 if(Node == NULL) return ;
\r
1327 // Update the node if it's dirty (don't bother if it's marked for
\r
1329 if( Node->ImplInt & FAT_FLAG_DIRTY && !(Node->ImplInt & FAT_FLAG_DELETE) )
\r
1331 tFAT_VolInfo buf[16];
\r
1332 tFAT_VolInfo *ft = &buf[ (Node->ImplInt & 0xFFFF) % 16 ];
\r
1334 FAT_int_ReadDirSector(Node, (Node->ImplInt & 0xFFFF)/16, buf);
\r
1335 ft->size = Node->Size;
\r
1336 // TODO: update adate, mtime, mdate
\r
1337 FAT_int_WriteDirEntry(Node, Node->ImplInt & 0xFFFF, ft);
\r
1339 Node->ImplInt &= ~FAT_FLAG_DIRTY;
\r
1343 // TODO: Make this more thread safe somehow, probably by moving the
\r
1344 // Inode_UncacheNode higher up and saving the cluster value somewhere
\r
1345 if( Node->ReferenceCount == 1 )
\r
1347 // Delete LFN Cache
\r
1349 if( Node->Flags & VFS_FFLAG_DIRECTORY)
\r
1350 FAT_int_DelLFN(Node);
\r
1355 if( Node->ImplInt & FAT_FLAG_DELETE ) {
\r
1356 // Since the node is marked, we only need to remove it's data
\r
1357 Uint32 cluster = Node->Inode & 0xFFFFFFFF;
\r
1358 while( cluster != -1 )
\r
1359 cluster = FAT_int_FreeCluster(Node->ImplPtr, cluster);
\r
1364 Inode_UncacheNode(disk->inodeHandle, Node->Inode);
\r