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reactos/lib/3rdparty/fullfat/ff_file.c
Amine Khaldi c424146e2c Create a branch for cmake bringup. 
svn path=/branches/cmake-bringup/; revision=48236
2010-07-24 18:52:44 +00:00

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/*****************************************************************************
* FullFAT - High Performance, Thread-Safe Embedded FAT File-System *
* Copyright (C) 2009 James Walmsley (james@worm.me.uk) *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
* *
* IMPORTANT NOTICE: *
* ================= *
* Alternative Licensing is available directly from the Copyright holder, *
* (James Walmsley). For more information consult LICENSING.TXT to obtain *
* a Commercial license. *
* *
* See RESTRICTIONS.TXT for extra restrictions on the use of FullFAT. *
* *
* Removing the above notice is illegal and will invalidate this license. *
*****************************************************************************
* See http://worm.me.uk/fullfat for more information. *
* Or http://fullfat.googlecode.com/ for latest releases and the wiki. *
*****************************************************************************/
/**
* @file ff_file.c
* @author James Walmsley
* @ingroup FILEIO
*
* @defgroup FILEIO FILE I/O Access
* @brief Provides an interface to allow File I/O on a mounted IOMAN.
*
* Provides file-system interfaces for the FAT file-system.
**/
#include "ff_file.h"
#include "ff_string.h"
/**
* @public
* @brief Converts STDIO mode strings into the equivalent FullFAT mode.
*
* @param Mode The mode string e.g. "rb" "rb+" "w" "a" "r" "w+" "a+" etc
*
* @return Returns the mode bits that should be passed to the FF_Open function.
**/
FF_T_UINT8 FF_GetModeBits(FF_T_INT8 *Mode) {
FF_T_UINT8 ModeBits = 0x00;
while(*Mode) {
switch(*Mode) {
case 'r': // Allow Read
case 'R':
ModeBits |= FF_MODE_READ;
break;
case 'w': // Allow Write
case 'W':
ModeBits |= FF_MODE_WRITE;
ModeBits |= FF_MODE_CREATE; // Create if not exist.
ModeBits |= FF_MODE_TRUNCATE;
break;
case 'a': // Append new writes to the end of the file.
case 'A':
ModeBits |= FF_MODE_WRITE;
ModeBits |= FF_MODE_APPEND;
ModeBits |= FF_MODE_CREATE; // Create if not exist.
break;
case '+': // Update the file, don't Append!
ModeBits |= FF_MODE_READ; // RW Mode
ModeBits |= FF_MODE_WRITE; // RW Mode
break;
/*case 'D': // Internal use only!
ModeBits |= FF_MODE_DIR;
break;*/
default: // b|B flags not supported (Binary mode is native anyway).
break;
}
Mode++;
}
return ModeBits;
}
/**
* FF_Open() Mode Information
* - FF_MODE_WRITE
* - Allows WRITE access to the file.
* .
* - FF_MODE_READ
* - Allows READ access to the file.
* .
* - FF_MODE_CREATE
* - Create file if it doesn't exist.
* .
* - FF_MODE_TRUNCATE
* - Erase the file if it already exists and overwrite.
* *
* - FF_MODE_APPEND
* - Causes all writes to occur at the end of the file. (Its impossible to overwrite other data in a file with this flag set).
* .
* .
*
* Some sample modes:
* - (FF_MODE_WRITE | FF_MODE_CREATE | FF_MODE_TRUNCATE)
* - Write access to the file. (Equivalent to "w").
* .
* - (FF_MODE_WRITE | FF_MODE_READ)
* - Read and Write access to the file. (Equivalent to "rb+").
* .
* - (FF_MODE_WRITE | FF_MODE_READ | FF_MODE_APPEND | FF_MODE_CREATE)
* - Read and Write append mode access to the file. (Equivalent to "a+").
* .
* .
* Be careful when choosing modes. For those using FF_Open() at the application layer
* its best to use the provided FF_GetModeBits() function, as this complies to the same
* behaviour as the stdio.h fopen() function.
*
**/
/**
* @public
* @brief Opens a File for Access
*
* @param pIoman FF_IOMAN object that was created by FF_CreateIOMAN().
* @param path Path to the File or object.
* @param Mode Access Mode required. Modes are a little complicated, the function FF_GetModeBits()
* @param Mode will convert a stdio Mode string into the equivalent Mode bits for this parameter.
* @param pError Pointer to a signed byte for error checking. Can be NULL if not required.
* @param pError To be checked when a NULL pointer is returned.
*
* @return NULL pointer on Error, in which case pError should be checked for more information.
* @return pError can be:
**/
FF_FILE *FF_Open(FF_IOMAN *pIoman, const FF_T_INT8 *path, FF_T_UINT8 Mode, FF_ERROR *pError) {
FF_FILE *pFile;
FF_FILE *pFileChain;
FF_DIRENT Object;
FF_T_UINT32 DirCluster, FileCluster;
FF_T_UINT32 nBytesPerCluster;
FF_T_INT8 filename[FF_MAX_FILENAME];
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;
i = (FF_T_UINT16) strlen(path);
while(i != 0) {
if(path[i] == '\\' || path[i] == '/') {
break;
}
i--;
}
strncpy(filename, (path + i + 1), FF_MAX_FILENAME);
if(i == 0) {
i = 1;
}
DirCluster = FF_FindDir(pIoman, path, i);
if(DirCluster) {
//RetVal = //FF_FindEntry(pIoman, DirCluster, filename, &Object, FF_TRUE);
//if(RetVal >= 0) {
//FileCluster = Object.ObjectCluster;//FF_FindEntryInDir(pIoman, DirCluster, filename, 0x00, &Object);
//} else {
// FileCluster = 0;
//}
FileCluster = FF_FindEntryInDir(pIoman, DirCluster, filename, 0x00, &Object);
if(!FileCluster) { // If 0 was returned, it might be because the file has no allocated cluster
if(strlen(filename) == strlen(Object.FileName)) {
if(Object.Filesize == 0 && FF_strmatch(filename, Object.FileName, (FF_T_UINT16) strlen(filename)) == FF_TRUE) {
// The file really was found!
FileCluster = 1;
}
}
}
if(!FileCluster) {
if((pFile->Mode & FF_MODE_CREATE)) {
FileCluster = FF_CreateFile(pIoman, DirCluster, filename, &Object);
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.
*
**/
FF_T_BOOL FF_isDirEmpty(FF_IOMAN *pIoman, const FF_T_INT8 *Path) {
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;
}
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_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;
}
/**
* @public
* @brief Moves a file or directory from source to destination.
*
* @param pIoman The FF_IOMAN object pointer.
* @param szSourceFile String of the source file to be moved or renamed.
* @param szDestinationFile String of the destination file to where the source should be moved or renamed.
*
* @return FF_ERR_NONE on success.
* @return FF_ERR_FILE_DESTINATION_EXISTS if the destination file exists.
* @return FF_ERR_FILE_COULD_NOT_CREATE_DIRENT if dirent creation failed (fatal error!).
* @return FF_ERR_FILE_DIR_NOT_FOUND if destination directory was not found.
* @return FF_ERR_FILE_SOURCE_NOT_FOUND if the source file was not found.
*
**/
FF_ERROR FF_Move(FF_IOMAN *pIoman, const FF_T_INT8 *szSourceFile, const FF_T_INT8 *szDestinationFile) {
FF_ERROR Error;
FF_FILE *pSrcFile, *pDestFile;
FF_DIRENT MyFile;
FF_T_UINT8 EntryBuffer[32];
FF_T_UINT16 i;
FF_T_UINT32 DirCluster;
if(!pIoman) {
return FF_ERR_NULL_POINTER;
}
// Check destination file doesn't exist!
pDestFile = FF_Open(pIoman, szDestinationFile, FF_MODE_READ, &Error);
if(pDestFile || (Error == FF_ERR_FILE_OBJECT_IS_A_DIR)) {
FF_Close(pDestFile);
return FF_ERR_FILE_DESTINATION_EXISTS; // YES -- FAIL
}
pSrcFile = FF_Open(pIoman, szSourceFile, FF_MODE_READ, &Error);
if(Error == FF_ERR_FILE_OBJECT_IS_A_DIR) {
// Open a directory for moving!
pSrcFile = FF_Open(pIoman, szSourceFile, FF_MODE_DIR, &Error);
}
if(pSrcFile) {
// Create the new dirent.
FF_FetchEntry(pIoman, pSrcFile->DirCluster, pSrcFile->DirEntry, EntryBuffer);
MyFile.Attrib = FF_getChar(EntryBuffer, (FF_T_UINT16)(FF_FAT_DIRENT_ATTRIB));
MyFile.Filesize = pSrcFile->Filesize;
MyFile.ObjectCluster = pSrcFile->ObjectCluster;
MyFile.CurrentItem = 0;
i = (FF_T_UINT16) strlen(szDestinationFile);
while(i != 0) {
if(szDestinationFile[i] == '\\' || szDestinationFile[i] == '/') {
break;
}
i--;
}
strncpy(MyFile.FileName, (szDestinationFile + i + 1), FF_MAX_FILENAME);
if(i == 0) {
i = 1;
}
DirCluster = FF_FindDir(pIoman, szDestinationFile, i);
if(DirCluster) {
// Destination Dir was found, we can now create the new entry.
if(FF_CreateDirent(pIoman, DirCluster, &MyFile)) {
FF_Close(pSrcFile);
return FF_ERR_FILE_COULD_NOT_CREATE_DIRENT; // FAILED
}
// Edit the Directory Entry! (So it appears as deleted);
FF_lockDIR(pIoman);
{
FF_RmLFNs(pIoman, pSrcFile->DirCluster, pSrcFile->DirEntry);
FF_FetchEntry(pIoman, pSrcFile->DirCluster, pSrcFile->DirEntry, EntryBuffer);
EntryBuffer[0] = 0xE5;
FF_PushEntry(pIoman, pSrcFile->DirCluster, pSrcFile->DirEntry, EntryBuffer);
}
FF_unlockDIR(pIoman);
FF_Close(pSrcFile);
FF_FlushCache(pIoman);
return FF_ERR_NONE;
}
return FF_ERR_FILE_DIR_NOT_FOUND;
}
return FF_ERR_FILE_SOURCE_NOT_FOUND; // Source not found!
}
/**
* @public
* @brief Get's the next Entry based on the data recorded in the FF_DIRENT object.
*
* @param pFile FF_FILE object that was created by FF_Open().
*
* @return FF_TRUE if End of File was reached. FF_FALSE if not.
* @return FF_FALSE if a null pointer was provided.
*
**/
FF_T_BOOL FF_isEOF(FF_FILE *pFile) {
if(!pFile) {
return FF_FALSE;
}
if(pFile->FilePointer >= pFile->Filesize) {
return FF_TRUE;
} else {
return FF_FALSE;
}
}
static FF_T_UINT32 FF_GetSequentialClusters(FF_IOMAN *pIoman, FF_T_UINT32 StartCluster, FF_T_UINT32 Limit) {
FF_T_UINT32 CurrentCluster;
FF_T_UINT32 NextCluster = StartCluster;
FF_T_UINT32 i = 0;
do {
CurrentCluster = NextCluster;
NextCluster = FF_getFatEntry(pIoman, CurrentCluster);
if(NextCluster == (CurrentCluster + 1)) {
i++;
} else {
break;
}
if(Limit) {
if(i == Limit) {
break;
}
}
}while(NextCluster == (CurrentCluster + 1));
return i;
}
static FF_T_SINT32 FF_ReadClusters(FF_FILE *pFile, FF_T_UINT32 Count, FF_T_UINT8 *buffer) {
FF_T_UINT32 Sectors;
FF_T_UINT32 SequentialClusters = 0;
FF_T_UINT32 nItemLBA;
FF_T_SINT32 RetVal;
while(Count != 0) {
if((Count - 1) > 0) {
SequentialClusters = FF_GetSequentialClusters(pFile->pIoman, pFile->AddrCurrentCluster, (Count - 1));
}
Sectors = (SequentialClusters + 1) * pFile->pIoman->pPartition->SectorsPerCluster;
nItemLBA = FF_Cluster2LBA(pFile->pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pFile->pIoman, nItemLBA);
do {
if(pFile->pIoman->pBlkDevice->fnReadBlocks) {
RetVal = pFile->pIoman->pBlkDevice->fnReadBlocks(buffer, nItemLBA, Sectors, pFile->pIoman->pBlkDevice->pParam);
if(RetVal == FF_ERR_DRIVER_BUSY) {
FF_Yield();
FF_Sleep(FF_DRIVER_BUSY_SLEEP);
}
} else {
RetVal = FF_ERR_DEVICE_DRIVER_FAILED;
}
}while(RetVal == FF_ERR_DRIVER_BUSY);
Count -= (SequentialClusters + 1);
pFile->AddrCurrentCluster = FF_TraverseFAT(pFile->pIoman, pFile->AddrCurrentCluster, (SequentialClusters + 1));
pFile->CurrentCluster += (SequentialClusters + 1);
buffer += Sectors * pFile->pIoman->BlkSize;
SequentialClusters = 0;
}
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;
}
static FF_T_SINT32 FF_WriteClusters(FF_FILE *pFile, FF_T_UINT32 Count, FF_T_UINT8 *buffer) {
FF_T_UINT32 Sectors;
FF_T_UINT32 SequentialClusters = 0;
FF_T_UINT32 nItemLBA;
FF_T_SINT32 RetVal;
while(Count != 0) {
if((Count - 1) > 0) {
SequentialClusters = FF_GetSequentialClusters(pFile->pIoman, pFile->AddrCurrentCluster, (Count - 1));
}
Sectors = (SequentialClusters + 1) * pFile->pIoman->pPartition->SectorsPerCluster;
nItemLBA = FF_Cluster2LBA(pFile->pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pFile->pIoman, nItemLBA);
do {
if(pFile->pIoman->pBlkDevice->fnWriteBlocks) {
RetVal = pFile->pIoman->pBlkDevice->fnWriteBlocks(buffer, nItemLBA, Sectors, pFile->pIoman->pBlkDevice->pParam);
if(RetVal == FF_ERR_DRIVER_BUSY) {
FF_Yield();
FF_Sleep(FF_DRIVER_BUSY_SLEEP);
}
} else {
RetVal = FF_ERR_DEVICE_DRIVER_FAILED;
}
}while(RetVal == FF_ERR_DRIVER_BUSY);
Count -= (SequentialClusters + 1);
pFile->AddrCurrentCluster = FF_TraverseFAT(pFile->pIoman, pFile->AddrCurrentCluster, (SequentialClusters + 1));
pFile->CurrentCluster += (SequentialClusters + 1);
buffer += Sectors * pFile->pIoman->BlkSize;
SequentialClusters = 0;
}
return 0;
}
/**
* @public
* @brief Equivalent to fread()
*
* @param pFile FF_FILE object that was created by FF_Open().
* @param ElementSize The size of an element to read.
* @param Count The number of elements to read.
* @param buffer A pointer to a buffer of adequate size to be filled with the requested data.
*
* @return Number of bytes read.
*
**/
FF_T_SINT32 FF_Read(FF_FILE *pFile, FF_T_UINT32 ElementSize, FF_T_UINT32 Count, FF_T_UINT8 *buffer) {
FF_T_UINT32 nBytes = ElementSize * Count;
FF_T_UINT32 nBytesRead = 0;
FF_T_UINT32 nBytesToRead;
FF_IOMAN *pIoman;
FF_BUFFER *pBuffer;
FF_T_UINT32 nRelBlockPos;
FF_T_UINT32 nItemLBA;
FF_T_SINT32 RetVal = 0;
FF_T_UINT16 sSectors;
FF_T_UINT32 nRelClusterPos;
FF_T_UINT32 nBytesPerCluster;
FF_T_UINT32 nClusterDiff;
if(!pFile) {
return FF_ERR_NULL_POINTER;
}
if(!(pFile->Mode & FF_MODE_READ)) {
return FF_ERR_FILE_NOT_OPENED_IN_READ_MODE;
}
pIoman = pFile->pIoman;
if(pFile->FilePointer == pFile->Filesize) {
return 0;
}
if((pFile->FilePointer + nBytes) > pFile->Filesize) {
nBytes = pFile->Filesize - pFile->FilePointer;
}
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
nRelBlockPos = FF_getMinorBlockEntry(pIoman, pFile->FilePointer, 1); // Get the position within a block.
nItemLBA = FF_Cluster2LBA(pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pIoman, nItemLBA + FF_getMajorBlockNumber(pIoman, pFile->FilePointer, 1)) + FF_getMinorBlockNumber(pIoman, pFile->FilePointer, 1);
if((nRelBlockPos + nBytes) < pIoman->BlkSize) { // Bytes to read are within a block and less than a block size.
pBuffer = FF_GetBuffer(pIoman, nItemLBA, FF_MODE_READ);
{
memcpy(buffer, (pBuffer->pBuffer + nRelBlockPos), nBytes);
}
FF_ReleaseBuffer(pIoman, pBuffer);
pFile->FilePointer += nBytes;
return nBytes; // Return the number of bytes read.
} else {
//---------- Read (memcpy) to a Sector Boundary
if(nRelBlockPos != 0) { // Not on a sector boundary, at this point the LBA is known.
nBytesToRead = pIoman->BlkSize - nRelBlockPos;
pBuffer = FF_GetBuffer(pIoman, nItemLBA, FF_MODE_READ);
{
// Here we copy to the sector boudary.
memcpy(buffer, (pBuffer->pBuffer + nRelBlockPos), nBytesToRead);
}
FF_ReleaseBuffer(pIoman, pBuffer);
nBytes -= nBytesToRead;
nBytesRead += nBytesToRead;
pFile->FilePointer += nBytesToRead;
buffer += nBytesToRead;
}
//---------- Read to a Cluster Boundary
nRelClusterPos = FF_getClusterPosition(pIoman, pFile->FilePointer, 1);
nBytesPerCluster = (pIoman->pPartition->SectorsPerCluster * pIoman->BlkSize);
if(nRelClusterPos != 0 && nBytes >= nBytesPerCluster) { // Need to get to cluster boundary
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
nItemLBA = FF_Cluster2LBA(pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pIoman, nItemLBA + FF_getMajorBlockNumber(pIoman, pFile->FilePointer, 1)) + FF_getMinorBlockNumber(pIoman, pFile->FilePointer, 1);
sSectors = (FF_T_UINT16) (pIoman->pPartition->SectorsPerCluster - (nRelClusterPos / pIoman->BlkSize));
do {
if(pIoman->pBlkDevice->fnReadBlocks) {
RetVal = pFile->pIoman->pBlkDevice->fnReadBlocks(buffer, nItemLBA, sSectors, pIoman->pBlkDevice->pParam);
}
if(RetVal == FF_ERR_DRIVER_BUSY) {
FF_Yield();
FF_Sleep(FF_DRIVER_BUSY_SLEEP);
}
}while(RetVal == FF_ERR_DRIVER_BUSY);
nBytesToRead = sSectors * pIoman->BlkSize;
nBytes -= nBytesToRead;
buffer += nBytesToRead;
nBytesRead += nBytesToRead;
pFile->FilePointer += nBytesToRead;
}
//---------- Read Clusters
if(nBytes >= nBytesPerCluster) {
//----- Thanks to Christopher Clark of DigiPen Institute of Technology in Redmond, US adding this traversal check.
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
//----- End of Contributor fix.
FF_ReadClusters(pFile, (nBytes / nBytesPerCluster), buffer);
nBytesToRead = (nBytesPerCluster * (nBytes / nBytesPerCluster));
pFile->FilePointer += nBytesToRead;
nBytes -= nBytesToRead;
buffer += nBytesToRead;
nBytesRead += nBytesToRead;
}
//---------- Read Remaining Blocks
if(nBytes >= pIoman->BlkSize) {
sSectors = (FF_T_UINT16) (nBytes / pIoman->BlkSize);
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
nItemLBA = FF_Cluster2LBA(pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pIoman, nItemLBA + FF_getMajorBlockNumber(pIoman, pFile->FilePointer, 1)) + FF_getMinorBlockNumber(pIoman, pFile->FilePointer, 1);
do {
if(pIoman->pBlkDevice->fnReadBlocks) {
RetVal = pFile->pIoman->pBlkDevice->fnReadBlocks(buffer, nItemLBA, sSectors, pIoman->pBlkDevice->pParam);
}
if(RetVal == FF_ERR_DRIVER_BUSY) {
FF_Yield();
FF_Sleep(FF_DRIVER_BUSY_SLEEP);
}
}while(RetVal == FF_ERR_DRIVER_BUSY);
nBytesToRead = sSectors * pIoman->BlkSize;
pFile->FilePointer += nBytesToRead;
nBytes -= nBytesToRead;
buffer += nBytesToRead;
nBytesRead += nBytesToRead;
}
//---------- Read (memcpy) Remaining Bytes
if(nBytes > 0) {
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
nItemLBA = FF_Cluster2LBA(pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pIoman, nItemLBA + FF_getMajorBlockNumber(pIoman, pFile->FilePointer, 1)) + FF_getMinorBlockNumber(pIoman, pFile->FilePointer, 1);
pBuffer = FF_GetBuffer(pIoman, nItemLBA, FF_MODE_READ);
{
memcpy(buffer, pBuffer->pBuffer, nBytes);
}
FF_ReleaseBuffer(pIoman, pBuffer);
nBytesToRead = nBytes;
pFile->FilePointer += nBytesToRead;
nBytes -= nBytesToRead;
buffer += nBytesToRead;
nBytesRead += nBytesToRead;
}
}
return nBytesRead;
}
/**
* @public
* @brief Equivalent to fgetc()
*
* @param pFile FF_FILE object that was created by FF_Open().
*
* @return The character that was read (cast as a 32-bit interger). -1 on EOF.
* @return -2 If a null file pointer was provided.
* @return -3 Device access failed.
*
**/
FF_T_SINT32 FF_GetC(FF_FILE *pFile) {
FF_T_UINT32 fileLBA;
FF_BUFFER *pBuffer;
FF_T_UINT8 retChar;
FF_T_UINT32 relMinorBlockPos;
FF_T_UINT32 clusterNum;
FF_T_UINT32 nClusterDiff;
if(!pFile) {
return FF_ERR_NULL_POINTER;
}
if(!(pFile->Mode & FF_MODE_READ)) {
return FF_ERR_FILE_NOT_OPENED_IN_READ_MODE;
}
if(pFile->FilePointer >= pFile->Filesize) {
return -1; // EOF!
}
relMinorBlockPos = FF_getMinorBlockEntry(pFile->pIoman, pFile->FilePointer, 1);
clusterNum = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1);
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pFile->pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
fileLBA = FF_Cluster2LBA(pFile->pIoman, pFile->AddrCurrentCluster) + FF_getMajorBlockNumber(pFile->pIoman, pFile->FilePointer, (FF_T_UINT16) 1);
fileLBA = FF_getRealLBA (pFile->pIoman, fileLBA) + FF_getMinorBlockNumber(pFile->pIoman, pFile->FilePointer, (FF_T_UINT16) 1);
pBuffer = FF_GetBuffer(pFile->pIoman, fileLBA, FF_MODE_READ);
{
if(!pBuffer) {
return -3;
}
retChar = pBuffer->pBuffer[relMinorBlockPos];
}
FF_ReleaseBuffer(pFile->pIoman, pBuffer);
pFile->FilePointer += 1;
return (FF_T_INT32) retChar;
}
FF_T_UINT32 FF_Tell(FF_FILE *pFile) {
return pFile->FilePointer;
}
/**
* @public
* @brief Writes data to a File.
*
* @param pFile FILE Pointer.
* @param ElementSize Size of an Element of Data to be copied. (in bytes).
* @param Count Number of Elements of Data to be copied. (ElementSize * Count must not exceed ((2^31)-1) bytes. (2GB). For best performance, multiples of 512 bytes or Cluster sizes are best.
* @param buffer Byte-wise buffer containing the data to be written.
*
* @return
**/
FF_T_SINT32 FF_Write(FF_FILE *pFile, FF_T_UINT32 ElementSize, FF_T_UINT32 Count, FF_T_UINT8 *buffer) {
FF_T_UINT32 nBytes = ElementSize * Count;
FF_T_UINT32 nBytesWritten = 0;
FF_T_UINT32 nBytesToWrite;
FF_IOMAN *pIoman;
FF_BUFFER *pBuffer;
FF_T_UINT32 nRelBlockPos;
FF_T_UINT32 nItemLBA;
FF_T_SINT32 RetVal = 0;
FF_T_UINT16 sSectors;
FF_T_UINT32 nRelClusterPos;
FF_T_UINT32 nBytesPerCluster, nClusterDiff, nClusters;
FF_ERROR Error;
if(!pFile) {
return FF_ERR_NULL_POINTER;
}
if(!(pFile->Mode & FF_MODE_WRITE)) {
return FF_ERR_FILE_NOT_OPENED_IN_WRITE_MODE;
}
// Make sure a write is after the append point.
if((pFile->Mode & FF_MODE_APPEND)) {
if(pFile->FilePointer < pFile->Filesize) {
FF_Seek(pFile, 0, FF_SEEK_END);
}
}
pIoman = pFile->pIoman;
nBytesPerCluster = (pIoman->pPartition->SectorsPerCluster * pIoman->BlkSize);
// Extend File for atleast nBytes!
// Handle file-space allocation
Error = FF_ExtendFile(pFile, pFile->FilePointer + nBytes);
if(Error) {
return Error;
}
nRelBlockPos = FF_getMinorBlockEntry(pIoman, pFile->FilePointer, 1); // Get the position within a block.
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster != FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
nItemLBA = FF_Cluster2LBA(pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pIoman, nItemLBA + FF_getMajorBlockNumber(pIoman, pFile->FilePointer, 1)) + FF_getMinorBlockNumber(pIoman, pFile->FilePointer, 1);
if((nRelBlockPos + nBytes) < pIoman->BlkSize) { // Bytes to read are within a block and less than a block size.
pBuffer = FF_GetBuffer(pIoman, nItemLBA, FF_MODE_WRITE);
{
memcpy((pBuffer->pBuffer + nRelBlockPos), buffer, nBytes);
}
FF_ReleaseBuffer(pIoman, pBuffer);
pFile->FilePointer += nBytes;
nBytesWritten = nBytes;
//return nBytes; // Return the number of bytes read.
} else {
//---------- Write (memcpy) to a Sector Boundary
if(nRelBlockPos != 0) { // Not on a sector boundary, at this point the LBA is known.
nBytesToWrite = pIoman->BlkSize - nRelBlockPos;
pBuffer = FF_GetBuffer(pIoman, nItemLBA, FF_MODE_WRITE);
{
// Here we copy to the sector boudary.
memcpy((pBuffer->pBuffer + nRelBlockPos), buffer, nBytesToWrite);
}
FF_ReleaseBuffer(pIoman, pBuffer);
nBytes -= nBytesToWrite;
nBytesWritten += nBytesToWrite;
pFile->FilePointer += nBytesToWrite;
buffer += nBytesToWrite;
}
//---------- Write to a Cluster Boundary
nRelClusterPos = FF_getClusterPosition(pIoman, pFile->FilePointer, 1);
if(nRelClusterPos != 0 && nBytes >= nBytesPerCluster) { // Need to get to cluster boundary
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
nItemLBA = FF_Cluster2LBA(pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pIoman, nItemLBA + FF_getMajorBlockNumber(pIoman, pFile->FilePointer, 1)) + FF_getMinorBlockNumber(pIoman, pFile->FilePointer, 1);
sSectors = (FF_T_UINT16) (pIoman->pPartition->SectorsPerCluster - (nRelClusterPos / pIoman->BlkSize));
do {
if(pIoman->pBlkDevice->fnWriteBlocks) {
RetVal = pFile->pIoman->pBlkDevice->fnWriteBlocks(buffer, nItemLBA, sSectors, pIoman->pBlkDevice->pParam);
}
if(RetVal == FF_ERR_DRIVER_BUSY) {
FF_Yield();
FF_Sleep(FF_DRIVER_BUSY_SLEEP);
}
}while(RetVal == FF_ERR_DRIVER_BUSY);
nBytesToWrite = sSectors * pIoman->BlkSize;
nBytes -= nBytesToWrite;
buffer += nBytesToWrite;
nBytesWritten += nBytesToWrite;
pFile->FilePointer += nBytesToWrite;
}
//---------- Write Clusters
if(nBytes >= nBytesPerCluster) {
//----- Thanks to Christopher Clark of DigiPen Institute of Technology in Redmond, US adding this traversal check.
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
//----- End of Contributor fix.
nClusters = (nBytes / nBytesPerCluster);
FF_WriteClusters(pFile, nClusters, buffer);
nBytesToWrite = (nBytesPerCluster * nClusters);
pFile->FilePointer += nBytesToWrite;
nBytes -= nBytesToWrite;
buffer += nBytesToWrite;
nBytesWritten += nBytesToWrite;
}
//---------- Write Remaining Blocks
if(nBytes >= pIoman->BlkSize) {
sSectors = (FF_T_UINT16) (nBytes / pIoman->BlkSize);
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
nItemLBA = FF_Cluster2LBA(pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pIoman, nItemLBA + FF_getMajorBlockNumber(pIoman, pFile->FilePointer, 1)) + FF_getMinorBlockNumber(pIoman, pFile->FilePointer, 1);
do {
if(pIoman->pBlkDevice->fnWriteBlocks) {
RetVal = pFile->pIoman->pBlkDevice->fnWriteBlocks(buffer, nItemLBA, sSectors, pIoman->pBlkDevice->pParam);
}
if(RetVal == FF_ERR_DRIVER_BUSY) {
FF_Yield();
FF_Sleep(FF_DRIVER_BUSY_SLEEP);
}
}while(RetVal == FF_ERR_DRIVER_BUSY);
nBytesToWrite = sSectors * pIoman->BlkSize;
pFile->FilePointer += nBytesToWrite;
nBytes -= nBytesToWrite;
buffer += nBytesToWrite;
nBytesWritten += nBytesToWrite;
}
//---------- Write (memcpy) Remaining Bytes
if(nBytes > 0) {
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
nItemLBA = FF_Cluster2LBA(pIoman, pFile->AddrCurrentCluster);
nItemLBA = FF_getRealLBA(pIoman, nItemLBA + FF_getMajorBlockNumber(pIoman, pFile->FilePointer, 1)) + FF_getMinorBlockNumber(pIoman, pFile->FilePointer, 1);
pBuffer = FF_GetBuffer(pIoman, nItemLBA, FF_MODE_WRITE);
{
memcpy(pBuffer->pBuffer, buffer, nBytes);
}
FF_ReleaseBuffer(pIoman, pBuffer);
nBytesToWrite = nBytes;
pFile->FilePointer += nBytesToWrite;
nBytes -= nBytesToWrite;
buffer += nBytesToWrite;
nBytesWritten += nBytesToWrite;
}
}
if(pFile->FilePointer > pFile->Filesize) {
pFile->Filesize = pFile->FilePointer;
}
return nBytesWritten;
}
/**
* @public
* @brief Writes a char to a FILE.
*
* @param pFile FILE Pointer.
* @param pa_cValue Char to be placed in the file.
*
* @return Returns the value written to the file, or a value less than 0.
*
**/
FF_T_SINT32 FF_PutC(FF_FILE *pFile, FF_T_UINT8 pa_cValue) {
FF_BUFFER *pBuffer;
FF_T_UINT32 iItemLBA;
FF_T_UINT32 iRelPos;
FF_T_UINT32 nClusterDiff;
if(!pFile) { // Ensure we don't have a Null file pointer on a Public interface.
return FF_ERR_NULL_POINTER;
}
if(!(pFile->Mode & FF_MODE_WRITE)) {
return FF_ERR_FILE_NOT_OPENED_IN_WRITE_MODE;
}
// Make sure a write is after the append point.
if((pFile->Mode & FF_MODE_APPEND)) {
if(pFile->FilePointer < pFile->Filesize) {
FF_Seek(pFile, 0, FF_SEEK_END);
}
}
iRelPos = FF_getMinorBlockEntry(pFile->pIoman, pFile->FilePointer, 1);
// Handle File Space Allocation.
FF_ExtendFile(pFile, pFile->FilePointer + 1);
nClusterDiff = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1) - pFile->CurrentCluster;
if(nClusterDiff) {
if(pFile->CurrentCluster < FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1)) {
pFile->AddrCurrentCluster = FF_TraverseFAT(pFile->pIoman, pFile->AddrCurrentCluster, nClusterDiff);
pFile->CurrentCluster += nClusterDiff;
}
}
iItemLBA = FF_Cluster2LBA(pFile->pIoman, pFile->AddrCurrentCluster) + FF_getMajorBlockNumber(pFile->pIoman, pFile->FilePointer, (FF_T_UINT16) 1);
iItemLBA = FF_getRealLBA (pFile->pIoman, iItemLBA) + FF_getMinorBlockNumber(pFile->pIoman, pFile->FilePointer, (FF_T_UINT16) 1);
pBuffer = FF_GetBuffer(pFile->pIoman, iItemLBA, FF_MODE_WRITE);
{
if(!pBuffer) {
return FF_ERR_DEVICE_DRIVER_FAILED;
}
FF_putChar(pBuffer->pBuffer, (FF_T_UINT16) iRelPos, pa_cValue);
}
FF_ReleaseBuffer(pFile->pIoman, pBuffer);
pFile->FilePointer += 1;
if(pFile->Filesize < (pFile->FilePointer)) {
pFile->Filesize += 1;
}
return pa_cValue;
}
/**
* @public
* @brief Equivalent to fseek()
*
* @param pFile FF_FILE object that was created by FF_Open().
* @param Offset An integer (+/-) to seek to, from the specified origin.
* @param Origin Where to seek from. (FF_SEEK_SET seek from start, FF_SEEK_CUR seek from current position, or FF_SEEK_END seek from end of file).
*
* @return 0 on Sucess,
* @return -2 if offset results in an invalid position in the file.
* @return -1 if a FF_FILE pointer was not recieved.
* @return -3 if an invalid origin was provided.
*
**/
FF_ERROR FF_Seek(FF_FILE *pFile, FF_T_SINT32 Offset, FF_T_INT8 Origin) {
if(!pFile) {
return FF_ERR_NULL_POINTER;
}
switch(Origin) {
case FF_SEEK_SET:
if((FF_T_UINT32) Offset <= pFile->Filesize && Offset >= 0) {
pFile->FilePointer = Offset;
pFile->CurrentCluster = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1);
pFile->AddrCurrentCluster = FF_TraverseFAT(pFile->pIoman, pFile->ObjectCluster, pFile->CurrentCluster);
} else {
return -2;
}
break;
case FF_SEEK_CUR:
if((Offset + pFile->FilePointer) <= pFile->Filesize && (Offset + (FF_T_SINT32) pFile->FilePointer) >= 0) {
pFile->FilePointer = Offset + pFile->FilePointer;
pFile->CurrentCluster = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1);
pFile->AddrCurrentCluster = FF_TraverseFAT(pFile->pIoman, pFile->ObjectCluster, pFile->CurrentCluster);
} else {
return -2;
}
break;
case FF_SEEK_END:
if((Offset + (FF_T_SINT32) pFile->Filesize) >= 0 && (Offset + pFile->Filesize) <= pFile->Filesize) {
pFile->FilePointer = Offset + pFile->Filesize;
pFile->CurrentCluster = FF_getClusterChainNumber(pFile->pIoman, pFile->FilePointer, 1);
pFile->AddrCurrentCluster = FF_TraverseFAT(pFile->pIoman, pFile->ObjectCluster, pFile->CurrentCluster);
} else {
return -2;
}
break;
default:
return -3;
}
return 0;
}
/**
* @public
* @brief Equivalent to fclose()
*
* @param pFile FF_FILE object that was created by FF_Open().
*
* @return 0 on sucess.
* @return -1 if a null pointer was provided.
*
**/
FF_ERROR FF_Close(FF_FILE *pFile) {
FF_FILE *pFileChain;
FF_DIRENT OriginalEntry;
FF_ERROR Error;
if(!pFile) {
return FF_ERR_NULL_POINTER;
}
// UpDate Dirent if File-size has changed?
// Update the Dirent!
Error = FF_GetEntry(pFile->pIoman, pFile->DirEntry, pFile->DirCluster, &OriginalEntry);
if(Error) {
return Error;
}
if(!pFile->FileDeleted) {
if(pFile->Filesize != OriginalEntry.Filesize) {
OriginalEntry.Filesize = pFile->Filesize;
FF_PutEntry(pFile->pIoman, pFile->DirEntry, pFile->DirCluster, &OriginalEntry);
}
}
//if(pFile->Mode == FF_MODE_WRITE) {
FF_FlushCache(pFile->pIoman); // Ensure all modfied blocks are flushed to disk!
//}
// Handle Linked list!
FF_PendSemaphore(pFile->pIoman->pSemaphore);
{ // Semaphore is required, or linked list could become corrupted.
if(pFile->pIoman->FirstFile == pFile) {
pFile->pIoman->FirstFile = pFile->Next;
} else {
pFileChain = (FF_FILE *) pFile->pIoman->FirstFile;
while(pFileChain->Next != pFile) {
pFileChain = pFileChain->Next;
}
pFileChain->Next = pFile->Next;
}
} // Semaphore released, linked list was shortened!
FF_ReleaseSemaphore(pFile->pIoman->pSemaphore);
// If file written, flush to disk
FF_Free(pFile);
// Simply free the pointer!
return FF_ERR_NONE;
}
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