FF_ERROR FF_RmFile(FF_IOMAN *pIoman, const FF_T_INT8 *path) {
FF_FILE *pFile;
FF_ERROR Error = 0;
FF_T_UINT8 EntryBuffer[32];
pFile = FF_Open(pIoman, path, FF_MODE_READ, &Error);
if(!pFile) {
return Error; // File in use or File not found!
}
pFile->FileDeleted = FF_TRUE;
FF_lockFAT(pIoman); // Lock the FAT so its thread-safe.
{
FF_UnlinkClusterChain(pIoman, pFile->ObjectCluster, 0); // 0 to delete the entire chain!
}
FF_unlockFAT(pIoman);
// Edit the Directory Entry! (So it appears as deleted);
FF_lockDIR(pIoman);
{
FF_RmLFNs(pIoman, pFile->DirCluster, pFile->DirEntry);
FF_FetchEntry(pIoman, pFile->DirCluster, pFile->DirEntry, EntryBuffer);
EntryBuffer[0] = 0xE5;
FF_PushEntry(pIoman, pFile->DirCluster, pFile->DirEntry, EntryBuffer);
}
FF_unlockDIR(pIoman);
FF_FlushCache(pIoman);
FF_Close(pFile); // Free the file pointer resources
return 0;
}
static FF_ERROR FF_ExtendFile(FF_FILE *pFile, FF_T_UINT32 Size) {
FF_IOMAN *pIoman = pFile->pIoman;
FF_T_UINT32 nBytesPerCluster = pIoman->pPartition->BlkSize * pIoman->pPartition->SectorsPerCluster;
FF_T_UINT32 nTotalClustersNeeded = Size / nBytesPerCluster;
FF_T_UINT32 nClusterToExtend;
FF_T_UINT32 CurrentCluster, NextCluster;
FF_T_UINT32 i;
FF_DIRENT OriginalEntry;
if((pFile->Mode & FF_MODE_WRITE) != FF_MODE_WRITE) {
return FF_ERR_FILE_NOT_OPENED_IN_WRITE_MODE;
}
if(pFile->Filesize == 0 && pFile->ObjectCluster == 0) { // No Allocated clusters.
// Create a Cluster chain!
pFile->AddrCurrentCluster = FF_CreateClusterChain(pFile->pIoman);
if(!FF_GetEntry(pIoman, pFile->DirEntry, pFile->DirCluster, &OriginalEntry)) {
OriginalEntry.ObjectCluster = pFile->AddrCurrentCluster;
FF_PutEntry(pIoman, pFile->DirEntry, pFile->DirCluster, &OriginalEntry);
} else {
return FF_ERR_FILE_EXTEND_FAILED;
}
pFile->ObjectCluster = pFile->AddrCurrentCluster;
pFile->iChainLength = 1;
pFile->CurrentCluster = 0;
pFile->iEndOfChain = pFile->AddrCurrentCluster;
}
if(Size % nBytesPerCluster) {
nTotalClustersNeeded += 1;
}
if(pFile->iChainLength == 0) { // First extension requiring the chain length,
pFile->iChainLength = FF_GetChainLength(pIoman, pFile->ObjectCluster, &pFile->iEndOfChain);
}
nClusterToExtend = (nTotalClustersNeeded - pFile->iChainLength);
if(nTotalClustersNeeded > pFile->iChainLength) {
NextCluster = pFile->AddrCurrentCluster;
FF_lockFAT(pIoman);
{
for(i = 0; i <= nClusterToExtend; i++) {
CurrentCluster = FF_FindEndOfChain(pIoman, NextCluster);
NextCluster = FF_FindFreeCluster(pIoman);
if(!NextCluster) {
FF_unlockFAT(pIoman);
return FF_ERR_FAT_NO_FREE_CLUSTERS;
}
FF_putFatEntry(pIoman, CurrentCluster, NextCluster);
FF_putFatEntry(pIoman, NextCluster, 0xFFFFFFFF);
}
pFile->iEndOfChain = FF_FindEndOfChain(pIoman, NextCluster);
}
FF_unlockFAT(pIoman);
pFile->iChainLength += i;
FF_DecreaseFreeClusters(pIoman, i); // Keep Tab of Numbers for fast FreeSize()
}
return FF_ERR_NONE;
}
FF_ERROR FF_RmFile(FF_IOMAN *pIoman, const FF_T_WCHAR *path) {
#else
FF_ERROR FF_RmFile(FF_IOMAN *pIoman, const FF_T_INT8 *path) {
#endif
FF_FILE *pFile;
FF_ERROR Error = FF_ERR_NONE;
FF_T_UINT8 EntryBuffer[32];
FF_FETCH_CONTEXT FetchContext;
pFile = FF_Open(pIoman, path, FF_MODE_READ, &Error);
if(!pFile) {
return Error; // File in use or File not found!
}
pFile->FileDeleted = FF_TRUE;
if(pFile->ObjectCluster) { // Ensure there is actually a cluster chain to delete!
FF_lockFAT(pIoman); // Lock the FAT so its thread-safe.
{
Error = FF_UnlinkClusterChain(pIoman, pFile->ObjectCluster, 0); // 0 to delete the entire chain!
}
FF_unlockFAT(pIoman);
if(Error) {
FF_Close(pFile);
return Error;
}
}
// Edit the Directory Entry! (So it appears as deleted);
FF_lockDIR(pIoman);
{
Error = FF_InitEntryFetch(pIoman, pFile->DirCluster, &FetchContext);
if(Error) {
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
Error = FF_RmLFNs(pIoman, pFile->DirEntry, &FetchContext);
if(Error) {
FF_CleanupEntryFetch(pIoman, &FetchContext);
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
Error = FF_FetchEntryWithContext(pIoman, pFile->DirEntry, &FetchContext, EntryBuffer);
if(Error) {
FF_CleanupEntryFetch(pIoman, &FetchContext);
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
EntryBuffer[0] = 0xE5;
Error = FF_PushEntryWithContext(pIoman, pFile->DirEntry, &FetchContext, EntryBuffer);
if(Error) {
FF_CleanupEntryFetch(pIoman, &FetchContext);
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
FF_CleanupEntryFetch(pIoman, &FetchContext);
}
FF_unlockDIR(pIoman);
Error = FF_FlushCache(pIoman);
if(Error) {
FF_Close(pFile);
return Error;
}
Error = FF_Close(pFile); // Free the file pointer resources
return Error;
}
FF_ERROR FF_RmDir(FF_IOMAN *pIoman, const FF_T_INT8 *path) {
FF_FILE *pFile;
FF_ERROR Error = FF_ERR_NONE;
FF_T_UINT8 EntryBuffer[32];
FF_T_SINT8 RetVal = FF_ERR_NONE;
#ifdef FF_PATH_CACHE
FF_T_UINT32 i;
#endif
if(!pIoman) {
return FF_ERR_NULL_POINTER;
}
pFile = FF_Open(pIoman, path, FF_MODE_DIR, &Error);
if(!pFile) {
return Error; // File in use or File not found!
}
pFile->FileDeleted = FF_TRUE;
FF_lockDIR(pIoman);
{
if(FF_isDirEmpty(pIoman, path)) {
FF_lockFAT(pIoman);
{
FF_UnlinkClusterChain(pIoman, pFile->ObjectCluster, 0); // 0 to delete the entire chain!
}
FF_unlockFAT(pIoman);
// Edit the Directory Entry! (So it appears as deleted);
FF_RmLFNs(pIoman, pFile->DirCluster, pFile->DirEntry);
FF_FetchEntry(pIoman, pFile->DirCluster, pFile->DirEntry, EntryBuffer);
EntryBuffer[0] = 0xE5;
FF_PushEntry(pIoman, pFile->DirCluster, pFile->DirEntry, EntryBuffer);
#ifdef FF_PATH_CACHE
FF_PendSemaphore(pIoman->pSemaphore); // Thread safety on shared object!
{
for(i = 0; i < FF_PATH_CACHE_DEPTH; i++) {
if(FF_strmatch(pIoman->pPartition->PathCache[i].Path, path, (FF_T_UINT16)strlen(path))) {
pIoman->pPartition->PathCache[i].Path[0] = '\0';
pIoman->pPartition->PathCache[i].DirCluster = 0;
FF_ReleaseSemaphore(pIoman->pSemaphore);
}
}
}
FF_ReleaseSemaphore(pIoman->pSemaphore);
#endif
FF_IncreaseFreeClusters(pIoman, pFile->iChainLength);
FF_FlushCache(pIoman);
} else {
RetVal = FF_ERR_DIR_NOT_EMPTY;
}
}
FF_unlockDIR(pIoman);
FF_Close(pFile); // Free the file pointer resources
// File is now lost!
return RetVal;
}
FF_FILE *FF_Open(FF_IOMAN *pIoman, const FF_T_WCHAR *path, FF_T_UINT8 Mode, FF_ERROR *pError) {
#else
FF_FILE *FF_Open(FF_IOMAN *pIoman, const FF_T_INT8 *path, FF_T_UINT8 Mode, FF_ERROR *pError) {
#endif
FF_FILE *pFile;
FF_FILE *pFileChain;
FF_DIRENT Object;
FF_T_UINT32 DirCluster, FileCluster;
FF_T_UINT32 nBytesPerCluster;
#ifdef FF_UNICODE_SUPPORT
FF_T_WCHAR filename[FF_MAX_FILENAME];
#else
FF_T_INT8 filename[FF_MAX_FILENAME];
#endif
FF_ERROR Error;
FF_T_UINT16 i;
if(pError) {
*pError = 0;
}
if(!pIoman) {
if(pError) {
*pError = FF_ERR_NULL_POINTER;
}
return (FF_FILE *)NULL;
}
pFile = FF_MALLOC(sizeof(FF_FILE));
if(!pFile) {
if(pError) {
*pError = FF_ERR_NOT_ENOUGH_MEMORY;
}
return (FF_FILE *)NULL;
}
// Get the Mode Bits.
pFile->Mode = Mode;
#ifdef FF_UNICODE_SUPPORT
i = (FF_T_UINT16) wcslen(path);
#else
i = (FF_T_UINT16) strlen(path);
#endif
while(i != 0) {
if(path[i] == '\\' || path[i] == '/') {
break;
}
i--;
}
#ifdef FF_UNICODE_SUPPORT
wcsncpy(filename, (path + i + 1), FF_MAX_FILENAME);
#else
strncpy(filename, (path + i + 1), FF_MAX_FILENAME);
#endif
if(i == 0) {
i = 1;
}
DirCluster = FF_FindDir(pIoman, path, i, &Error);
if(Error) {
if(pError) {
*pError = Error;
}
FF_FREE(pFile);
return (FF_FILE *) NULL;
}
if(DirCluster) {
FileCluster = FF_FindEntryInDir(pIoman, DirCluster, filename, 0x00, &Object, &Error);
if(Error) {
if(pError) {
*pError = Error;
}
FF_FREE(pFile);
return (FF_FILE *) NULL;
}
if(!FileCluster) { // If 0 was returned, it might be because the file has no allocated cluster
#ifdef FF_UNICODE_SUPPORT
if(wcslen(filename) == wcslen(Object.FileName)) {
if(Object.Filesize == 0 && FF_strmatch(filename, Object.FileName, (FF_T_UINT16) wcslen(filename)) == FF_TRUE) {
#else
if(strlen(filename) == strlen(Object.FileName)) {
if(Object.Filesize == 0 && FF_strmatch(filename, Object.FileName, (FF_T_UINT16) strlen(filename)) == FF_TRUE) {
#endif
// The file really was found!
FileCluster = 1;
}
}
}
if(!FileCluster) {
if((pFile->Mode & FF_MODE_CREATE)) {
FileCluster = FF_CreateFile(pIoman, DirCluster, filename, &Object, &Error);
if(Error) {
if(pError) {
*pError = Error;
}
FF_FREE(pFile);
return (FF_FILE *) NULL;
}
Object.CurrentItem += 1;
}
}
if(FileCluster) {
if(Object.Attrib == FF_FAT_ATTR_DIR) {
if(!(pFile->Mode & FF_MODE_DIR)) {
// Not the object, File Not Found!
FF_FREE(pFile);
if(pError) {
*pError = FF_ERR_FILE_OBJECT_IS_A_DIR;
}
return (FF_FILE *) NULL;
}
}
//---------- Ensure Read-Only files don't get opened for Writing.
if((pFile->Mode & FF_MODE_WRITE) || (pFile->Mode & FF_MODE_APPEND)) {
if((Object.Attrib & FF_FAT_ATTR_READONLY)) {
FF_FREE(pFile);
if(pError) {
*pError = FF_ERR_FILE_IS_READ_ONLY;
}
return (FF_FILE *) NULL;
}
}
pFile->pIoman = pIoman;
pFile->FilePointer = 0;
pFile->ObjectCluster = Object.ObjectCluster;
pFile->Filesize = Object.Filesize;
pFile->CurrentCluster = 0;
pFile->AddrCurrentCluster = pFile->ObjectCluster;
//pFile->Mode = Mode;
pFile->Next = NULL;
pFile->DirCluster = DirCluster;
pFile->DirEntry = Object.CurrentItem - 1;
nBytesPerCluster = pFile->pIoman->pPartition->SectorsPerCluster / pIoman->BlkSize;
pFile->iChainLength = 0;
pFile->iEndOfChain = 0;
pFile->FileDeleted = FF_FALSE;
// File Permission Processing
// Only "w" and "w+" mode strings can erase a file's contents.
// Any other combinations will not cause an erase.
if((pFile->Mode & FF_MODE_TRUNCATE)) {
pFile->Filesize = 0;
pFile->FilePointer = 0;
}
/*
Add pFile onto the end of our linked list of FF_FILE objects.
*/
FF_PendSemaphore(pIoman->pSemaphore);
{
if(!pIoman->FirstFile) {
pIoman->FirstFile = pFile;
} else {
pFileChain = (FF_FILE *) pIoman->FirstFile;
do {
if(pFileChain->ObjectCluster == pFile->ObjectCluster) {
// File is already open! DON'T ALLOW IT!
FF_ReleaseSemaphore(pIoman->pSemaphore);
FF_FREE(pFile);
if(pError) {
*pError = FF_ERR_FILE_ALREADY_OPEN;
}
return (FF_FILE *) NULL;
}
if(!pFileChain->Next) {
pFileChain->Next = pFile;
break;
}
pFileChain = (FF_FILE *) pFileChain->Next;
}while(pFileChain != NULL);
}
}
FF_ReleaseSemaphore(pIoman->pSemaphore);
return pFile;
}else {
FF_FREE(pFile);
if(pError) {
*pError = FF_ERR_FILE_NOT_FOUND;
}
return (FF_FILE *) NULL;
}
}
if(pError) {
*pError = FF_ERR_FILE_INVALID_PATH;
}
FF_FREE(pFile);
return (FF_FILE *)NULL;
}
/**
* @public
* @brief Tests if a Directory contains any other files or folders.
*
* @param pIoman FF_IOMAN object returned from the FF_CreateIOMAN() function.
*
**/
#ifdef FF_UNICODE_SUPPORT
FF_T_BOOL FF_isDirEmpty(FF_IOMAN *pIoman, const FF_T_WCHAR *Path) {
#else
FF_T_BOOL FF_isDirEmpty(FF_IOMAN *pIoman, const FF_T_INT8 *Path) {
#endif
FF_DIRENT MyDir;
FF_ERROR RetVal = FF_ERR_NONE;
FF_T_UINT8 i = 0;
if(!pIoman) {
return FF_FALSE;
}
RetVal = FF_FindFirst(pIoman, &MyDir, Path);
while(RetVal == 0) {
i++;
RetVal = FF_FindNext(pIoman, &MyDir);
if(i > 2) {
return FF_FALSE;
}
}
return FF_TRUE;
}
#ifdef FF_UNICODE_SUPPORT
FF_ERROR FF_RmDir(FF_IOMAN *pIoman, const FF_T_WCHAR *path) {
#else
FF_ERROR FF_RmDir(FF_IOMAN *pIoman, const FF_T_INT8 *path) {
#endif
FF_FILE *pFile;
FF_ERROR Error = FF_ERR_NONE;
FF_T_UINT8 EntryBuffer[32];
FF_FETCH_CONTEXT FetchContext;
FF_T_SINT8 RetVal = FF_ERR_NONE;
#ifdef FF_PATH_CACHE
FF_T_UINT32 i;
#endif
if(!pIoman) {
return FF_ERR_NULL_POINTER;
}
pFile = FF_Open(pIoman, path, FF_MODE_DIR, &Error);
if(!pFile) {
return Error; // File in use or File not found!
}
pFile->FileDeleted = FF_TRUE;
FF_lockDIR(pIoman);
{
if(FF_isDirEmpty(pIoman, path)) {
FF_lockFAT(pIoman);
{
Error = FF_UnlinkClusterChain(pIoman, pFile->ObjectCluster, 0); // 0 to delete the entire chain!
}
FF_unlockFAT(pIoman);
if(Error) {
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
// Initialise the dirent Fetch Context object for faster removal of dirents.
Error = FF_InitEntryFetch(pIoman, pFile->DirCluster, &FetchContext);
if(Error) {
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
// Edit the Directory Entry! (So it appears as deleted);
Error = FF_RmLFNs(pIoman, pFile->DirEntry, &FetchContext);
if(Error) {
FF_CleanupEntryFetch(pIoman, &FetchContext);
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
Error = FF_FetchEntryWithContext(pIoman, pFile->DirEntry, &FetchContext, EntryBuffer);
if(Error) {
FF_CleanupEntryFetch(pIoman, &FetchContext);
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
EntryBuffer[0] = 0xE5;
Error = FF_PushEntryWithContext(pIoman, pFile->DirEntry, &FetchContext, EntryBuffer);
if(Error) {
FF_CleanupEntryFetch(pIoman, &FetchContext);
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
#ifdef FF_PATH_CACHE
FF_PendSemaphore(pIoman->pSemaphore); // Thread safety on shared object!
{
for(i = 0; i < FF_PATH_CACHE_DEPTH; i++) {
#ifdef FF_UNICODE_SUPPORT
if(FF_strmatch(pIoman->pPartition->PathCache[i].Path, path, (FF_T_UINT16)wcslen(path))) {
#else
if(FF_strmatch(pIoman->pPartition->PathCache[i].Path, path, (FF_T_UINT16)strlen(path))) {
#endif
pIoman->pPartition->PathCache[i].Path[0] = '\0';
pIoman->pPartition->PathCache[i].DirCluster = 0;
FF_ReleaseSemaphore(pIoman->pSemaphore);
}
}
}
FF_ReleaseSemaphore(pIoman->pSemaphore);
#endif
Error = FF_IncreaseFreeClusters(pIoman, pFile->iChainLength);
if(Error) {
FF_CleanupEntryFetch(pIoman, &FetchContext);
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
FF_CleanupEntryFetch(pIoman, &FetchContext);
Error = FF_FlushCache(pIoman);
if(Error) {
FF_unlockDIR(pIoman);
FF_Close(pFile);
return Error;
}
} else {
RetVal = FF_ERR_DIR_NOT_EMPTY;
}
}
FF_unlockDIR(pIoman);
Error = FF_Close(pFile); // Free the file pointer resources
if(Error) {
return Error;
}
// File is now lost!
return RetVal;
}