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windows-nt/Source/XPSP1/NT/drivers/storage/tffsport/fatlite.c

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2020-09-26 03:20:57 -05:00
/*!!*/
/*
* $Log: V:/Flite/archives/TrueFFS5/Src/FATLITE.C_V $
*
* Rev 1.10 Jan 17 2002 23:00:28 oris
* Removed SINGLE_BUFFER ifdef.
* Changed debug print added \r.
* Removed warnings.
*
* Rev 1.9 Nov 16 2001 00:26:46 oris
* Removed warnings.
*
* Rev 1.8 Nov 08 2001 10:45:28 oris
* Removed warnings.
*
* Rev 1.7 May 16 2001 21:17:30 oris
* Added the FL_ prefix to the following defines: ON, OFF
* Change "data" named variables to flData to avoid name clashes.
*
* Rev 1.6 Apr 18 2001 09:31:02 oris
* added new line at the end of the file.
*
* Rev 1.5 Apr 16 2001 10:42:16 vadimk
* Emty file bug was fixed ( we should not allocate cluster for an empty file )
*
* Rev 1.4 Apr 09 2001 15:07:10 oris
* End with an empty line.
*
* Rev 1.3 Apr 03 2001 14:42:02 oris
* Bug fix - 64 sectors in directory return flInvalidFatChain.
*
* Rev 1.2 Apr 01 2001 08:02:46 oris
* copywrite notice.
*
* Rev 1.1 Feb 12 2001 12:16:42 oris
* Changed mutexs for TrueFFS 5.0
*
* Rev 1.0 Feb 04 2001 11:02:28 oris
* Initial revision.
*
*/
/***********************************************************************************/
/* M-Systems Confidential */
/* Copyright (C) M-Systems Flash Disk Pioneers Ltd. 1995-2001 */
/* All Rights Reserved */
/***********************************************************************************/
/* NOTICE OF M-SYSTEMS OEM */
/* SOFTWARE LICENSE AGREEMENT */
/* */
/* THE USE OF THIS SOFTWARE IS GOVERNED BY A SEPARATE LICENSE */
/* AGREEMENT BETWEEN THE OEM AND M-SYSTEMS. REFER TO THAT AGREEMENT */
/* FOR THE SPECIFIC TERMS AND CONDITIONS OF USE, */
/* OR CONTACT M-SYSTEMS FOR LICENSE ASSISTANCE: */
/* E-MAIL = info@m-sys.com */
/***********************************************************************************/
#include "bddefs.h"
#include "blockdev.h"
#include "dosformt.h"
#if defined(FILES) && FILES>0
File fileTable[FILES]; /* the file table */
#define directory ((DirectoryEntry *) vol.volBuffer.flData)
FLStatus closeFile(File *file); /* forward */
FLStatus flushBuffer(Volume vol); /* forward */
/*----------------------------------------------------------------------*/
/* d i s m o u n t V o l u m e */
/* */
/* Closing all files. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus dismountFS(Volume vol,FLStatus status)
{
int i;
#ifndef FL_READ_ONLY
if (status == flOK)
checkStatus(flushBuffer(&vol));
#endif
/* Close or discard all files and make them available */
for (i = 0; i < FILES; i++)
if (fileTable[i].fileVol == &vol)
if (vol.flags & VOLUME_MOUNTED)
closeFile(&fileTable[i]);
else
fileTable[i].flags = 0;
vol.volBuffer.sectorNo = UNASSIGNED_SECTOR; /* Current sector no. (none) */
vol.volBuffer.dirty = vol.volBuffer.checkPoint = FALSE;
return flOK;
}
#ifndef FL_READ_ONLY
/*----------------------------------------------------------------------*/
/* f l u s h B u f f e r */
/* */
/* Writes the buffer contents if it is dirty. */
/* */
/* If this is a FAT sector, all FAT copies are written. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus flushBuffer(Volume vol)
{
if (vol.volBuffer.dirty) {
FLStatus status;
unsigned i;
Volume *bufferOwner = &vol;
status = (*bufferOwner).tl.writeSector((*bufferOwner).tl.rec, vol.volBuffer.sectorNo,
vol.volBuffer.flData);
if (status == flOK) {
if (vol.volBuffer.sectorNo >= (*bufferOwner).firstFATSectorNo &&
vol.volBuffer.sectorNo < (*bufferOwner).secondFATSectorNo)
for (i = 1; i < (*bufferOwner).numberOfFATS; i++)
checkStatus((*bufferOwner).tl.writeSector((*bufferOwner).tl.rec,
vol.volBuffer.sectorNo + i * (*bufferOwner).sectorsPerFAT,
vol.volBuffer.flData));
}
else
vol.volBuffer.sectorNo = UNASSIGNED_SECTOR;
vol.volBuffer.dirty = vol.volBuffer.checkPoint = FALSE;
return status;
}
else
return flOK;
}
/*----------------------------------------------------------------------*/
/* u p d a t e S e c t o r */
/* */
/* Prepares a sector for update in the buffer */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* sectorNo : Sector no. to read */
/* read : Whether to initialize buffer by reading, or */
/* clearing */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
static FLStatus updateSector(Volume vol, SectorNo sectorNo, FLBoolean read)
{
if (sectorNo != vol.volBuffer.sectorNo || &vol != vol.volBuffer.owner) {
const void FAR0 *mappedSector;
checkStatus(flushBuffer(&vol));
vol.volBuffer.sectorNo = sectorNo;
vol.volBuffer.owner = &vol;
if (read) {
mappedSector = vol.tl.mapSector(vol.tl.rec,sectorNo,NULL);
if (mappedSector) {
if(mappedSector==dataErrorToken)
return flDataError;
tffscpy(vol.volBuffer.flData,mappedSector,SECTOR_SIZE);
}
else
return flSectorNotFound;
}
else
tffsset(vol.volBuffer.flData,0,SECTOR_SIZE);
}
vol.volBuffer.dirty = TRUE;
return flOK;
}
#endif /* FL_READ_ONLY */
/*----------------------------------------------------------------------*/
/* f i r s t S e c t o r O f C l u s t e r */
/* */
/* Get sector no. corresponding to cluster no. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* cluster : Cluster no. */
/* */
/* Returns: */
/* first sector no. of cluster */
/*----------------------------------------------------------------------*/
static SectorNo firstSectorOfCluster(Volume vol, unsigned cluster)
{
return (SectorNo) (cluster - 2) * vol.sectorsPerCluster +
vol.firstDataSectorNo;
}
/*----------------------------------------------------------------------*/
/* g e t D i r E n t r y */
/* */
/* Get a read-only copy of a directory entry. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* file : File belonging to directory entry */
/* */
/* Returns: */
/* dirEntry : Pointer to directory entry */
/*----------------------------------------------------------------------*/
static const DirectoryEntry FAR0 *getDirEntry(File *file)
{
return (DirectoryEntry FAR0 *) findSector(file->fileVol,file->directorySector) +
file->directoryIndex;
}
#ifndef FL_READ_ONLY
/*----------------------------------------------------------------------*/
/* g e t D i r E n t r y F o r U p d a t e */
/* */
/* Read a directory sector into the sector buffer and point to an */
/* entry, with the intention of modifying it. */
/* The buffer will be flushed on operation exit. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* file : File belonging to directory entry */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/* dirEntry : Pointer to directory entry in buffer */
/*----------------------------------------------------------------------*/
static FLStatus getDirEntryForUpdate(File *file, DirectoryEntry * *dirEntry)
{
Volume vol = file->fileVol;
checkStatus(updateSector(file->fileVol,file->directorySector,TRUE));
*dirEntry = directory + file->directoryIndex;
vol.volBuffer.checkPoint = TRUE;
return flOK;
}
#endif /* FL_READ_ONLY */
/*----------------------------------------------------------------------*/
/* s e t C u r r e n t D a t e T i m e */
/* */
/* Set current time/date in directory entry */
/* */
/* Parameters: */
/* dirEntry : Pointer to directory entry */
/* */
/*----------------------------------------------------------------------*/
static void setCurrentDateTime(DirectoryEntry *dirEntry)
{
toLE2(dirEntry->updateTime,flCurrentTime());
toLE2(dirEntry->updateDate,flCurrentDate());
}
/*----------------------------------------------------------------------*/
/* g e t F A T e n t r y */
/* */
/* Get an entry from the FAT. The 1st FAT copy is used. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* cluster : Cluster no. of enrty. */
/* */
/* Returns: */
/* Value of FAT entry. */
/*----------------------------------------------------------------------*/
static FLStatus getFATentry(Volume vol, unsigned* entry)
{
unsigned cluster = *entry;
LEushort FAR0 *fat16Sector;
unsigned fatSectorNo = vol.firstFATSectorNo;
#ifdef FAT_12BIT
if (vol.flags & VOLUME_12BIT_FAT)
fatSectorNo += (cluster * 3) >> (SECTOR_SIZE_BITS + 1);
else
#endif
fatSectorNo += cluster >> (SECTOR_SIZE_BITS - 1);
#ifndef FL_READ_ONLY
if (!vol.volBuffer.dirty) {
/* If the buffer is free, use it to store this FAT sector */
checkStatus(updateSector(&vol,fatSectorNo,TRUE));
vol.volBuffer.dirty = FALSE;
}
#endif /* FL_READ_ONLY */
fat16Sector = (LEushort FAR0 *) findSector(&vol,fatSectorNo);
if(fat16Sector==NULL)
return flSectorNotFound;
if(fat16Sector==dataErrorToken)
return flDataError;
#ifdef FAT_12BIT
if (vol.flags & VOLUME_12BIT_FAT) {
unsigned char FAR0 *fat12Sector = (unsigned char FAR0 *) fat16Sector;
unsigned halfByteOffset = (cluster * 3) & (SECTOR_SIZE * 2 - 1);
unsigned char firstByte = fat12Sector[halfByteOffset / 2];
halfByteOffset += 2;
if (halfByteOffset >= SECTOR_SIZE * 2) {
/* Entry continues on the next sector. What a mess */
halfByteOffset -= SECTOR_SIZE * 2;
fat12Sector = (unsigned char FAR0 *) findSector(&vol,fatSectorNo + 1);
if(fat12Sector==NULL)
return flSectorNotFound;
if(fat12Sector==dataErrorToken)
return flDataError;
}
if (halfByteOffset & 1)
*entry = ((firstByte & 0xf0) >> 4) + (fat12Sector[halfByteOffset / 2] << 4);
else
*entry = firstByte + ((fat12Sector[halfByteOffset / 2] & 0xf) << 8);
if (*entry == 0xfff) /* in 12-bit fat, 0xfff marks the last cluster */
*entry = FAT_LAST_CLUSTER; /* return 0xffff instead */
return flOK;
}
else {
#endif
*entry = LE2(fat16Sector[cluster & (SECTOR_SIZE / 2 - 1)]);
return flOK;
#ifdef FAT_12BIT
}
#endif
}
#ifndef FL_READ_ONLY
/*----------------------------------------------------------------------*/
/* s e t F A T e n t r y */
/* */
/* Writes a new value to a given FAT cluster entry. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* cluster : Cluster no. of enrty. */
/* entry : New value of FAT entry. */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
static FLStatus setFATentry(Volume vol, unsigned cluster, unsigned entry)
{
LEushort *fat16Sector;
unsigned fatSectorNo = vol.firstFATSectorNo;
#ifdef FAT_12BIT
if (vol.flags & VOLUME_12BIT_FAT)
fatSectorNo += (cluster * 3) >> (SECTOR_SIZE_BITS + 1);
else
#endif
fatSectorNo += cluster >> (SECTOR_SIZE_BITS - 1);
checkStatus(updateSector(&vol,fatSectorNo,TRUE));
fat16Sector = (LEushort *) vol.volBuffer.flData;
#ifdef FAT_12BIT
if (vol.flags & VOLUME_12BIT_FAT) {
unsigned char *fat12Sector = (unsigned char *) vol.volBuffer.flData;
unsigned halfByteOffset = (cluster * 3) & (SECTOR_SIZE * 2 - 1);
if (halfByteOffset & 1) {
fat12Sector[halfByteOffset / 2] &= 0xf;
fat12Sector[halfByteOffset / 2] |= (entry & 0xf) << 4;
}
else
fat12Sector[halfByteOffset / 2] = entry;
halfByteOffset += 2;
if (halfByteOffset >= SECTOR_SIZE * 2) {
/* Entry continues on the next sector. What a mess */
halfByteOffset -= SECTOR_SIZE * 2;
fatSectorNo++;
checkStatus(updateSector(&vol,fatSectorNo,TRUE));
}
if (halfByteOffset & 1)
fat12Sector[halfByteOffset / 2] = entry >> 4;
else {
fat12Sector[halfByteOffset / 2] &= 0xf0;
fat12Sector[halfByteOffset / 2] |= (entry & 0x0f00) >> 8;
}
}
else
#endif
toLE2(fat16Sector[cluster & (SECTOR_SIZE / 2 - 1)],entry);
return flOK;
}
/*----------------------------------------------------------------------*/
/* a l l o c a t e C l u s t e r */
/* */
/* Allocates a new cluster for a file and adds it to a FAT chain or */
/* marks it in a directory entry. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* file : File to extend. It should be positioned at */
/* end-of-file. */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
static FLStatus allocateCluster(File *file)
{
Volume vol = file->fileVol;
unsigned originalRover;
unsigned fatEntry;
if (file->flags & FILE_READ_ONLY)
return flNoWriteAccess;
/* Look for a free cluster. Start at the allocation rover */
originalRover = vol.allocationRover;
do {
vol.allocationRover++;
if (vol.allocationRover > vol.maxCluster)
vol.allocationRover = 2; /* wraparound to start of volume */
if (vol.allocationRover == originalRover)
return flNoSpaceInVolume;
fatEntry = vol.allocationRover;
checkStatus(getFATentry(&vol,&fatEntry));
} while ( fatEntry!= FAT_FREE);
/* Found a free cluster. Mark it as an end of chain */
checkStatus(setFATentry(&vol,vol.allocationRover,FAT_LAST_CLUSTER));
/* Mark previous cluster or directory to point to it */
if (file->currentCluster == 0) {
DirectoryEntry *dirEntry;
checkStatus(getDirEntryForUpdate(file,&dirEntry));
toLE2(dirEntry->startingCluster,vol.allocationRover);
setCurrentDateTime(dirEntry);
}
else
checkStatus(setFATentry(&vol,file->currentCluster,vol.allocationRover));
/* Set our new current cluster */
file->currentCluster = vol.allocationRover;
return flOK;
}
#endif /* FL_READ_ONLY */
/*----------------------------------------------------------------------*/
/* g e t S e c t o r A n d O f f s e t */
/* */
/* Based on the current position of a file, gets a sector number and */
/* offset in the sector that marks the file's current position. */
/* If the position is at the end-of-file, and the file is opened for */
/* write, this routine will extend the file by allocating a new cluster.*/
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
static FLStatus getSectorAndOffset(File *file,
SectorNo *sectorNo,
unsigned *offsetInSector)
{
Volume vol = file->fileVol;
unsigned offsetInCluster =
(unsigned) file->currentPosition & (vol.bytesPerCluster - 1);
if (file->flags & FILE_IS_ROOT_DIR) {
if (file->currentPosition >= file->fileSize)
return flRootDirectoryFull;
}
if (offsetInCluster == 0) { /* This cluster is finished. Get next */
if (!(file->flags & FILE_IS_ROOT_DIR)) {
if (((file->currentPosition >= file->fileSize) && (file->currentPosition>0))||((file->fileSize==0)&&!(file->flags & FILE_IS_DIRECTORY))) {
#ifndef FL_READ_ONLY
checkStatus(allocateCluster(file));
#else
return flSectorNotFound;
#endif
}
else {
unsigned nextCluster;
if (file->currentCluster == 0) {
const DirectoryEntry FAR0 *dirEntry;
dirEntry = getDirEntry(file);
if(dirEntry==NULL)
return flSectorNotFound;
if(dirEntry==dataErrorToken)
return flDataError;
nextCluster = LE2(dirEntry->startingCluster);
}
else {
nextCluster = file->currentCluster;
checkStatus(getFATentry(&vol,&nextCluster));
}
if (nextCluster < 2 || nextCluster > vol.maxCluster)
/* We have a bad file size, or the FAT is bad */
return flInvalidFATchain;
file->currentCluster = nextCluster;
}
}
}
*offsetInSector = offsetInCluster & (SECTOR_SIZE - 1);
if (file->flags & FILE_IS_ROOT_DIR)
*sectorNo = vol.rootDirectorySectorNo +
(SectorNo) (file->currentPosition >> SECTOR_SIZE_BITS);
else
*sectorNo = firstSectorOfCluster(&vol,file->currentCluster) +
(SectorNo) (offsetInCluster >> SECTOR_SIZE_BITS);
return flOK;
}
/*----------------------------------------------------------------------*/
/* c l o s e F i l e */
/* */
/* Closes an open file, records file size and dates in directory and */
/* releases file handle. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* file : File to close. */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus closeFile(File *file)
{
#ifndef FL_READ_ONLY
if ((file->flags & FILE_MODIFIED) && !(file->flags & FILE_IS_ROOT_DIR)) {
DirectoryEntry *dirEntry;
checkStatus(getDirEntryForUpdate(file,&dirEntry));
dirEntry->attributes |= ATTR_ARCHIVE;
if (!(file->flags & FILE_IS_DIRECTORY))
toLE4(dirEntry->fileSize,file->fileSize);
setCurrentDateTime(dirEntry);
}
#endif
file->flags = 0; /* no longer open */
return flOK;
}
#ifndef FL_READ_ONLY
#ifdef SUB_DIRECTORY
/*----------------------------------------------------------------------*/
/* e x t e n d D i r e c t o r y */
/* */
/* Extends a directory, writing empty entries and the mandatory '.' and */
/* '..' entries. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* file : Directory file to extend. On entry, */
/* currentPosition == fileSize. On exit, fileSize*/
/* is updated. */
/* ownerDir : Cluster no. of owner directory */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
static FLStatus extendDirectory(File *file, unsigned ownerDir)
{
Volume vol = file->fileVol;
unsigned i;
SectorNo sectorOfDir;
unsigned offsetInSector;
/* Assuming the current position is at the end-of-file, this will */
/* extend the directory. */
checkStatus(getSectorAndOffset(file,&sectorOfDir,&offsetInSector));
for (i = 0; i < vol.sectorsPerCluster; i++) {
/* Write binary zeroes to indicate never-used entries */
checkStatus(updateSector(&vol,sectorOfDir + i,FALSE));
vol.volBuffer.checkPoint = TRUE;
if (file->currentPosition == 0 && i == 0) {
/* Add the mandatory . and .. entries */
tffscpy(directory[0].name,". ",sizeof directory[0].name);
directory[0].attributes = ATTR_ARCHIVE | ATTR_DIRECTORY;
toLE2(directory[0].startingCluster,file->currentCluster);
toLE4(directory[0].fileSize,0);
setCurrentDateTime(&directory[0]);
tffscpy(&directory[1],&directory[0],sizeof directory[0]);
directory[1].name[1] = '.'; /* change . to .. */
toLE2(directory[1].startingCluster,ownerDir);
}
file->fileSize += SECTOR_SIZE;
}
/* Update the parent directory by closing the file */
file->flags |= FILE_MODIFIED;
return closeFile(file);
}
#endif /* SUB_DIRECTORY */
#endif /* FL_READ_ONLY */
/*----------------------------------------------------------------------*/
/* f i n d D i r E n t r y */
/* */
/* Finds a directory entry by path-name, or finds an available directory*/
/* entry if the file does not exist. */
/* Most fields necessary for opening a file are set by this routine. */
/* */
/* Parameters: */
/* vol : Pointer identifying drive */
/* path : path to find */
/* file : File in which to record directory information.*/
/* Specific fields on entry: */
/* flags: if FILE_MUST_OPEN = 1, directory */
/* will be extended if necessary. */
/* on exit: */
/* flags: FILE_IS_DIRECTORY and */
/* FILE_IS_ROOT_DIR set if true. */
/* fileSize: Set for non-directory files. */
/* currentCluster: Set to 0 (unknown) */
/* ownerDirCluster: Set to 1st cluster of */
/* owning directory. */
/* directorySector: Sector of directory. If 0 */
/* entry not found and directory full*/
/* directoryEntry: Entry # in directory sector */
/* currentPosition: not set by this routine. */
/* */
/* Returns: */
/* FLStatus : 0 on success and file found */
/* flFileNotFound on success and file not found */
/* otherwise failed. */
/*----------------------------------------------------------------------*/
static FLStatus findDirEntry(Volume vol, FLSimplePath FAR1 *path, File *file)
{
File scanFile; /* Internal file of search */
unsigned dirBackPointer = 0; /* 1st cluster of previous directory */
FLStatus status = flOK; /* root directory exists */
file->flags |= (FILE_IS_ROOT_DIR | FILE_IS_DIRECTORY);
file->fileSize = (long) (vol.sectorsInRootDirectory) << SECTOR_SIZE_BITS;
file->fileVol = &vol;
#ifdef SUB_DIRECTORY
for (; path->name[0]; path++) /* while we have another path segment */
#else
if (path->name[0]) /* search the root directory */
#endif
{
status = flFileNotFound; /* not yet */
if (!(file->flags & FILE_IS_DIRECTORY))
return flPathNotFound; /* if we don't have a directory,
we have no business here */
scanFile = *file; /* the previous file found becomes the scan file */
scanFile.currentPosition = 0;
file->directorySector = 0; /* indicate no entry found yet */
file->flags &= ~(FILE_IS_ROOT_DIR | FILE_IS_DIRECTORY | FILE_READ_ONLY);
file->ownerDirCluster = dirBackPointer;
file->fileSize = 0;
file->currentCluster = 0;
/* Scan directory */
while (scanFile.currentPosition < scanFile.fileSize) {
int i;
DirectoryEntry FAR0 *dirEntry;
SectorNo sectorOfDir;
unsigned offsetInSector;
FLStatus readStatus = getSectorAndOffset(&scanFile,&sectorOfDir,&offsetInSector);
if (readStatus == flInvalidFATchain) {
scanFile.fileSize = scanFile.currentPosition; /* now we know */
break; /* we ran into the end of the directory file */
}
else if (readStatus != flOK)
return readStatus;
dirEntry = (DirectoryEntry FAR0 *) findSector(&vol,sectorOfDir);
if (dirEntry == NULL)
return flSectorNotFound;
if(dirEntry==dataErrorToken)
return flDataError;
scanFile.currentPosition += SECTOR_SIZE;
for (i = 0; i < DIRECTORY_ENTRIES_PER_SECTOR; i++, dirEntry++) {
if (tffscmp(path,dirEntry->name,sizeof dirEntry->name) == 0 &&
!(dirEntry->attributes & ATTR_VOL_LABEL)) {
/* Found a match */
file->directorySector = sectorOfDir;
file->directoryIndex = i;
file->fileSize = LE4(dirEntry->fileSize);
if (dirEntry->attributes & ATTR_DIRECTORY) {
file->flags |= FILE_IS_DIRECTORY;
file->fileSize = 0x7fffffffl;
/* Infinite. Directories don't have a recorded size */
}
if (dirEntry->attributes & ATTR_READ_ONLY)
file->flags |= FILE_READ_ONLY;
dirBackPointer = LE2(dirEntry->startingCluster);
status = flOK;
goto endOfPathSegment;
}
else if (dirEntry->name[0] == NEVER_USED_DIR_ENTRY ||
dirEntry->name[0] == DELETED_DIR_ENTRY) {
/* Found a free entry. Remember it in case we don't find a match */
if (file->directorySector == 0) {
file->directorySector = sectorOfDir;
file->directoryIndex = i;
}
if (dirEntry->name[0] == NEVER_USED_DIR_ENTRY) /* end of dir */
goto endOfPathSegment;
}
}
}
endOfPathSegment:
;
}
#ifndef FL_READ_ONLY
if (status == flFileNotFound && (file->flags & FILE_MUST_OPEN) &&
file->directorySector == 0) {
/* We did not find a place in the directory for this new entry. The */
/* directory should be extended. 'scanFile' refers to the directory */
/* to extend, and the current pointer is at its end */
#ifdef SUB_DIRECTORY
checkStatus(extendDirectory(&scanFile,(unsigned) file->ownerDirCluster));
file->directorySector = firstSectorOfCluster(&vol,scanFile.currentCluster);
file->directoryIndex = 0; /* Has to be. This is a new cluster */
#else
status = flRootDirectoryFull;
#endif
}
#endif /* FL_READ_ONLY */
return status;
}
/*----------------------------------------------------------------------*/
/* */
/* r e a d M u l t i S e c t o r */
/* */
/* Checks if file was written on consequent sectors. */
/* Parameters: */
/* file : File to check */
/* stillToRead : Number of bytes to read. If the read extends */
/* beyond the end-of-file, the read is truncated */
/* at the end-of-file. */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/* sectors : Number of consequent sectors */
/* */
/*----------------------------------------------------------------------*/
static FLStatus readMultiSector(Volume vol,File *file,
unsigned long stillToRead,
SectorNo* sectors)
{
SectorNo sectorCount = 1;
unsigned offsetInCluster = (unsigned)((file->currentPosition & (vol.bytesPerCluster - 1))+512);
while(stillToRead>=((sectorCount+1)<<SECTOR_SIZE_BITS)){
if(offsetInCluster>=vol.bytesPerCluster) {
unsigned nextCluster;
nextCluster = file->currentCluster;
checkStatus(getFATentry(&vol,&nextCluster));
if (nextCluster < 2 || nextCluster > vol.maxCluster)
/* We have a bad file size, or the FAT is bad */
return flInvalidFATchain;
if(nextCluster!=file->currentCluster+1)
break;
file->currentCluster = nextCluster;
offsetInCluster = 0;
}
offsetInCluster+=SECTOR_SIZE;
sectorCount++;
}
*sectors = sectorCount;
return flOK;
}
/*----------------------------------------------------------------------*/
/* r e a d F i l e */
/* */
/* Reads from the current position in the file to the user-buffer. */
/* Parameters: */
/* file : File to read. */
/* ioreq->irData : Address of user buffer */
/* ioreq->irLength : Number of bytes to read. If the read extends */
/* beyond the end-of-file, the read is truncated */
/* at the end-of-file. */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/* ioreq->irLength : Actual number of bytes read */
/*----------------------------------------------------------------------*/
FLStatus readFile(File *file,IOreq FAR2 *ioreq)
{
Volume vol = file->fileVol;
unsigned char FAR1 *userData = (unsigned char FAR1 *) ioreq->irData; /* user buffer address */
unsigned long stillToRead = ioreq->irLength;
unsigned long remainingInFile = file->fileSize - file->currentPosition;
ioreq->irLength = 0; /* read so far */
/* Should we return an end of file status ? */
if (stillToRead > remainingInFile)
stillToRead = (unsigned) remainingInFile;
while (stillToRead > 0) {
SectorNo sectorToRead;
unsigned offsetInSector;
unsigned long readThisTime;
const char FAR0 *sector;
checkStatus(getSectorAndOffset(file,&sectorToRead,&offsetInSector));
if (stillToRead < SECTOR_SIZE || offsetInSector > 0 || vol.tl.readSectors==NULL) {
sector = (const char FAR0 *) findSector(&vol,sectorToRead);
if(sector==NULL)
{
DEBUG_PRINT(("readFile : sector was not found\r\n"));
return flSectorNotFound;
}
if(sector==dataErrorToken)
return flDataError;
readThisTime = SECTOR_SIZE - offsetInSector;
if (readThisTime > stillToRead)
readThisTime = (unsigned) stillToRead;
if (sector)
tffscpy(userData,sector + offsetInSector,(unsigned short)readThisTime);
else
return flSectorNotFound; /* Sector does not exist */
}
else {
SectorNo sectorCount;
checkStatus(readMultiSector(&vol,file,stillToRead,&sectorCount));
checkStatus(vol.tl.readSectors(vol.tl.rec,sectorToRead,userData,sectorCount));
readThisTime = (sectorCount<<SECTOR_SIZE_BITS);
}
stillToRead -= readThisTime;
ioreq->irLength += readThisTime;
userData = (unsigned char FAR1 *)flAddLongToFarPointer(userData,readThisTime);
file->currentPosition += readThisTime;
}
return flOK;
}
/*----------------------------------------------------------------------*/
/* f l F i n d N e x t F i l e */
/* */
/* See the description of 'flFindFirstFile'. */
/* */
/* Parameters: */
/* irHandle : File handle returned by flFindFirstFile. */
/* irData : Address of user buffer to receive a */
/* DirectoryEntry structure */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus findNextFile(File *file, IOreq FAR2 *ioreq)
{
DirectoryEntry FAR1 *irDirEntry = (DirectoryEntry FAR1 *) ioreq->irData;
FLStatus status;
/* Do we have a directory ? */
if (!(file->flags & FILE_IS_DIRECTORY))
return flNotADirectory;
ioreq->irLength = DIRECTORY_ENTRY_SIZE;
do {
/*checkStatus(readFile(file,ioreq));*/
/*Vadim: add treatment for a full cluster sub-directory */
status=readFile(file,ioreq);
if ((ioreq->irLength != DIRECTORY_ENTRY_SIZE) ||
(irDirEntry->name[0] == NEVER_USED_DIR_ENTRY)||
(!(file->flags&FILE_IS_ROOT_DIR)&&(status==flInvalidFATchain)))
{
checkStatus(closeFile(file));
return flNoMoreFiles;
}
else
{
if(status!=flOK)
return status;
}
} while (irDirEntry->name[0] == DELETED_DIR_ENTRY ||
(irDirEntry->attributes & ATTR_VOL_LABEL));
return flOK;
}
#ifndef FL_READ_ONLY
/*----------------------------------------------------------------------*/
/* d e l e t e F i l e */
/* */
/* Deletes a file or directory. */
/* */
/* Parameters: */
/* ioreq->irPath : path of file to delete */
/* isDirectory : 0 = delete file, other = delete directory */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus deleteFile(Volume vol, IOreq FAR2 *ioreq, FLBoolean isDirectory)
{
File file; /* Our private file */
DirectoryEntry *dirEntry;
file.flags = 0;
checkStatus(findDirEntry(&vol,ioreq->irPath,&file));
if (file.flags & FILE_READ_ONLY)
return flNoWriteAccess;
if (isDirectory) {
DirectoryEntry fileFindInfo;
ioreq->irData = &fileFindInfo;
if (!(file.flags & FILE_IS_DIRECTORY))
return flNotADirectory;
/* Verify that directory is empty */
file.currentPosition = 0;
for (;;) {
FLStatus status = findNextFile(&file,ioreq);
if (status == flNoMoreFiles)
break;
if (status != flOK)
return status;
if (!((fileFindInfo.attributes & ATTR_DIRECTORY) &&
(tffscmp(fileFindInfo.name,". ",sizeof fileFindInfo.name) == 0 ||
tffscmp(fileFindInfo.name,".. ",sizeof fileFindInfo.name) == 0)))
return flDirectoryNotEmpty;
}
}
else {
/* Did we find a directory ? */
if (file.flags & FILE_IS_DIRECTORY)
return flFileIsADirectory;
}
/* Mark directory entry deleted */
checkStatus(getDirEntryForUpdate(&file,&dirEntry));
dirEntry->name[0] = DELETED_DIR_ENTRY;
/* Delete FAT entries */
file.currentPosition = 0;
file.currentCluster = LE2(dirEntry->startingCluster);
while (file.currentPosition < file.fileSize) {
unsigned nextCluster;
if (file.currentCluster < 2 || file.currentCluster > vol.maxCluster)
/* We have a bad file size, or the FAT is bad */
return isDirectory ? flOK : flInvalidFATchain;
nextCluster = file.currentCluster;
checkStatus(getFATentry(&vol,&nextCluster));
/* mark FAT free */
checkStatus(setFATentry(&vol,file.currentCluster,FAT_FREE));
vol.volBuffer.checkPoint = TRUE;
/* mark sectors free */
checkStatus(vol.tl.deleteSector(vol.tl.rec,
firstSectorOfCluster(&vol,file.currentCluster),
vol.sectorsPerCluster));
file.currentPosition += vol.bytesPerCluster;
file.currentCluster = nextCluster;
}
if (file.currentCluster > 1 && file.currentCluster <= vol.maxCluster) {
checkStatus(setFATentry(&vol,file.currentCluster,FAT_FREE));
vol.volBuffer.checkPoint = TRUE;
/* mark sectors free */
checkStatus(vol.tl.deleteSector(vol.tl.rec,
firstSectorOfCluster(&vol,file.currentCluster),
vol.sectorsPerCluster));
}
return flOK;
}
/*----------------------------------------------------------------------*/
/* s e t N a m e I n D i r E n t r y */
/* */
/* Sets the file name in a directory entry from a path name */
/* */
/* Parameters: */
/* dirEntry : directory entry */
/* path : path the last segment of which is the name */
/* */
/*----------------------------------------------------------------------*/
static void setNameInDirEntry(DirectoryEntry *dirEntry, FLSimplePath FAR1 *path)
{
FLSimplePath FAR1 *lastSegment;
for (lastSegment = path; /* Find null terminator */
lastSegment->name[0];
lastSegment++);
tffscpy(dirEntry->name,--lastSegment,sizeof dirEntry->name);
}
#endif /* FL_READ_ONLY */
/*----------------------------------------------------------------------*/
/* o p e n F i l e */
/* */
/* Opens an existing file or creates a new file. Creates a file handle */
/* for further file processing. */
/* */
/* Parameters: */
/* ioreq->irFlags : Access and action options, defined below */
/* ioreq->irPath : path of file to open */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/* ioreq->irHandle : New file handle for open file */
/* */
/*----------------------------------------------------------------------*/
FLStatus openFile(Volume vol, IOreq FAR2 *ioreq)
{
int i;
FLStatus status;
/* Look for an available file */
File *file = fileTable;
for (i = 0; i < FILES && (file->flags & FILE_IS_OPEN); i++, file++);
if (i >= FILES)
return flTooManyOpenFiles;
file->fileVol = &vol;
ioreq->irHandle = i; /* return file handle */
#ifndef FL_READ_ONLY
/* Delete file if exists and required */
if (ioreq->irFlags & ACCESS_CREATE) {
FLStatus status = deleteFile(&vol,ioreq,FALSE);
if (status != flOK && status != flFileNotFound)
return status;
}
/* Find the path */
if (ioreq->irFlags & ACCESS_CREATE)
file->flags |= FILE_MUST_OPEN;
#endif /* FL_READ_ONLY */
status = findDirEntry(file->fileVol,ioreq->irPath,file);
if (status != flOK &&
(status != flFileNotFound || !(ioreq->irFlags & ACCESS_CREATE)))
return status;
/* Did we find a directory ? */
if (file->flags & FILE_IS_DIRECTORY)
return flFileIsADirectory;
#ifndef FL_READ_ONLY
/* Create file if required */
if (ioreq->irFlags & ACCESS_CREATE) {
DirectoryEntry *dirEntry;
/* Look for a free cluster. Start at the allocation rover */
checkStatus(getDirEntryForUpdate(file,&dirEntry));
setNameInDirEntry(dirEntry,ioreq->irPath);
dirEntry->attributes = ATTR_ARCHIVE;
toLE2(dirEntry->startingCluster,0);
toLE4(dirEntry->fileSize,0);
setCurrentDateTime(dirEntry);
}
#endif /* FL_READ_ONLY */
if (!(ioreq->irFlags & ACCESS_READ_WRITE))
file->flags |= FILE_READ_ONLY;
file->currentPosition = 0; /* located at file beginning */
file->flags |= FILE_IS_OPEN; /* this file now officially open */
return flOK;
}
#ifndef FL_READ_ONLY
/*----------------------------------------------------------------------*/
/* */
/* w r i t e M u l t i S e c t o r */
/* */
/* Checks the possibility of writing file on consequent sectors. */
/* Parameters: */
/* file : File to check */
/* stillToWrite : Number of bytes to read. If the read extends */
/* beyond the end-of-file, the read is truncated */
/* at the end-of-file. */
/* Returns: */
/* FLStatu : 0 on success, otherwise failed */
/* sectors : Number of consequent sectors */
/* */
/*----------------------------------------------------------------------*/
static FLStatus writeMultiSector(Volume vol,File *file,
unsigned long stillToWrite,
SectorNo* sectors)
{
SectorNo sectorCount = 1;
unsigned offsetInCluster = (unsigned)((file->currentPosition & (vol.bytesPerCluster - 1))+512);
while(stillToWrite>=((sectorCount+1)<<SECTOR_SIZE_BITS)){
if(offsetInCluster>=vol.bytesPerCluster) {
if ((long)(file->currentPosition+(sectorCount<<SECTOR_SIZE_BITS))>= file->fileSize) {
if(file->currentCluster <= vol.maxCluster) {
unsigned fatEntry;
if(file->currentCluster+1>vol.maxCluster)
break;/*There is not free consequent cluster*/
fatEntry = file->currentCluster+1;
checkStatus(getFATentry(&vol,&fatEntry));
if(fatEntry==FAT_FREE) {
/* Found a free cluster. Mark it as an end of chain */
checkStatus(setFATentry(&vol,file->currentCluster+1,FAT_LAST_CLUSTER));
/* Mark previous cluster or directory to point to it */
checkStatus(setFATentry(&vol,file->currentCluster,file->currentCluster+1));
/* Set our new current cluster */
file->currentCluster = file->currentCluster+1;
offsetInCluster = 0;
}
else /*There is not free consequent cluster*/
break;
}
else
return flInvalidFATchain;
}
else { /* We did not passed end of file*/
unsigned nextCluster = file->currentCluster;
checkStatus(getFATentry(&vol,&nextCluster));
if (nextCluster < 2 || nextCluster > vol.maxCluster)
/* We have a bad file size, or the FAT is bad */
return flInvalidFATchain;
if(nextCluster!=file->currentCluster+1)
break;
file->currentCluster = nextCluster;
offsetInCluster = 0;
}
}
offsetInCluster+=SECTOR_SIZE;
sectorCount++;
}
*sectors = sectorCount;
return flOK;
}
/*----------------------------------------------------------------------*/
/* w r i t e F i l e */
/* */
/* Writes from the current position in the file from the user-buffer. */
/* */
/* Parameters: */
/* file : File to write. */
/* ioreq->irData : Address of user buffer */
/* ioreq->irLength : Number of bytes to write. */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/* ioreq->irLength : Actual number of bytes written */
/*----------------------------------------------------------------------*/
FLStatus writeFile(File *file, IOreq FAR2 *ioreq)
{
Volume vol = file->fileVol;
char FAR1 *userData = (char FAR1 *) ioreq->irData; /* user buffer address */
unsigned long stillToWrite = ioreq->irLength;
if (file->flags & FILE_READ_ONLY)
return flNoWriteAccess;
file->flags |= FILE_MODIFIED;
ioreq->irLength = 0; /* written so far */
while (stillToWrite > 0) {
SectorNo sectorToWrite;
unsigned offsetInSector;
unsigned long writeThisTime;
checkStatus(getSectorAndOffset(file,&sectorToWrite,&offsetInSector));
if (stillToWrite < SECTOR_SIZE || offsetInSector > 0) {
unsigned short shortWrite;
/* Not on full sector boundary */
checkStatus(updateSector(&vol,sectorToWrite,
((file->currentPosition < file->fileSize) || (offsetInSector > 0))));
#ifdef HIGH_SECURITY
if ((file->flags & FILE_IS_DIRECTORY)||(file->currentPosition < file->fileSize))
#else
if(file->flags & FILE_IS_DIRECTORY)
#endif
vol.volBuffer.checkPoint = TRUE;
writeThisTime = SECTOR_SIZE - offsetInSector;
if (writeThisTime > stillToWrite)
writeThisTime = stillToWrite;
shortWrite = (unsigned short)writeThisTime;
tffscpy(vol.volBuffer.flData + offsetInSector,userData,shortWrite);
}
else {
SectorNo sectorCount;
if(vol.tl.writeMultiSector!=NULL) {
checkStatus(writeMultiSector(&vol,file,stillToWrite,&sectorCount));
}
else
sectorCount = 1;
if (((sectorToWrite+sectorCount > vol.volBuffer.sectorNo) && (sectorToWrite <= vol.volBuffer.sectorNo)) &&
(&vol == vol.volBuffer.owner)) {
vol.volBuffer.sectorNo = UNASSIGNED_SECTOR; /* no longer valid */
vol.volBuffer.dirty = vol.volBuffer.checkPoint = FALSE;
}
if(vol.tl.writeMultiSector==NULL) {
checkStatus(vol.tl.writeSector(vol.tl.rec,sectorToWrite,userData));
}
else {
checkStatus(vol.tl.writeMultiSector(vol.tl.rec,sectorToWrite,userData,sectorCount));
}
writeThisTime = (sectorCount<<SECTOR_SIZE_BITS);
}
stillToWrite -= writeThisTime;
ioreq->irLength += writeThisTime;
userData = (char FAR1 *)flAddLongToFarPointer(userData,writeThisTime);
file->currentPosition += writeThisTime;
if (file->currentPosition > file->fileSize)
file->fileSize = file->currentPosition;
}
return flOK;
}
#endif /* FL_READ_ONLY */
/*----------------------------------------------------------------------*/
/* s e e k F i l e */
/* */
/* Sets the current position in the file, relative to file start, end */
/* or current position. */
/* Note: This function will not move the file pointer beyond the */
/* beginning or end of file, so the actual file position may be */
/* different from the required. The actual position is indicated on */
/* return. */
/* */
/* Parameters: */
/* file : File to set position. */
/* ioreq->irLength : Offset to set position. */
/* ioreq->irFlags : Method code */
/* SEEK_START: absolute offset from start of file */
/* SEEK_CURR: signed offset from current position */
/* SEEK_END: signed offset from end of file */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/* ioreq->irLength : Actual absolute offset from start of file */
/*----------------------------------------------------------------------*/
FLStatus seekFile(File *file, IOreq FAR2 *ioreq)
{
Volume vol = file->fileVol;
long int seekPosition = ioreq->irLength;
switch (ioreq->irFlags) {
case SEEK_START:
break;
case SEEK_CURR:
seekPosition += file->currentPosition;
break;
case SEEK_END:
seekPosition += file->fileSize;
break;
default:
return flBadParameter;
}
if (seekPosition < 0)
seekPosition = 0;
if (seekPosition > file->fileSize)
seekPosition = file->fileSize;
/* now set the position ... */
if (seekPosition < file->currentPosition) {
file->currentCluster = 0;
file->currentPosition = 0;
}
while (file->currentPosition < seekPosition) {
SectorNo sectorNo;
unsigned offsetInSector;
checkStatus(getSectorAndOffset(file,&sectorNo,&offsetInSector));
file->currentPosition += vol.bytesPerCluster;
file->currentPosition &= - (long) (vol.bytesPerCluster);
}
ioreq->irLength = file->currentPosition = seekPosition;
return flOK;
}
/*----------------------------------------------------------------------*/
/* f l F i n d F i l e */
/* */
/* Finds a file entry in a directory, optionally modifying the file */
/* time/date and/or attributes. */
/* Files may be found by handle no. provided they are open, or by name. */
/* Only the Hidden, System or Read-only attributes may be modified. */
/* Entries may be found for any existing file or directory other than */
/* the root. A DirectoryEntry structure describing the file is copied */
/* to a user buffer. */
/* */
/* The DirectoryEntry structure is defined in dosformt.h */
/* */
/* Parameters: */
/* irHandle : If by name: Drive number (0, 1, ...) */
/* else : Handle of open file */
/* irPath : If by name: Specifies a file or directory path*/
/* irFlags : Options flags */
/* FIND_BY_HANDLE: Find open file by handle. */
/* Default is access by path. */
/* SET_DATETIME: Update time/date from buffer */
/* SET_ATTRIBUTES: Update attributes from buffer */
/* irDirEntry : Address of user buffer to receive a */
/* DirectoryEntry structure */
/* */
/* Returns: */
/* irLength : Modified */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus findFile(Volume vol, File *file, IOreq FAR2 *ioreq)
{
File tFile; /* temporary file for searches */
if (ioreq->irFlags & FIND_BY_HANDLE)
tFile = *file;
else {
tFile.flags = 0;
checkStatus(findDirEntry(&vol,ioreq->irPath,&tFile));
}
if (tFile.flags & FILE_IS_ROOT_DIR)
if (ioreq->irFlags & (SET_DATETIME | SET_ATTRIBUTES))
return flPathIsRootDirectory;
else {
DirectoryEntry FAR1 *irDirEntry = (DirectoryEntry FAR1 *) ioreq->irData;
tffsset(irDirEntry,0,sizeof(DirectoryEntry));
irDirEntry->attributes = ATTR_DIRECTORY;
return flOK;
}
#ifndef FL_READ_ONLY
if (ioreq->irFlags & (SET_DATETIME | SET_ATTRIBUTES)) {
DirectoryEntry FAR1 *irDirEntry = (DirectoryEntry FAR1 *) ioreq->irData;
DirectoryEntry *dirEntry;
checkStatus(getDirEntryForUpdate(&tFile,&dirEntry));
if (ioreq->irFlags & SET_DATETIME) {
COPY2(dirEntry->updateDate,irDirEntry->updateDate);
COPY2(dirEntry->updateTime,irDirEntry->updateTime);
}
if (ioreq->irFlags & SET_ATTRIBUTES) {
unsigned char attr;
attr = dirEntry->attributes & ATTR_DIRECTORY;
attr |= irDirEntry->attributes &
(ATTR_ARCHIVE | ATTR_HIDDEN | ATTR_READ_ONLY | ATTR_SYSTEM);
dirEntry->attributes = attr;
}
tffscpy(irDirEntry, dirEntry, sizeof(DirectoryEntry));
}
else
#endif /* FL_READ_ONLY */
{
const DirectoryEntry FAR0 *dirEntry;
dirEntry = getDirEntry(&tFile);
if(dirEntry==NULL)
return flSectorNotFound;
if(dirEntry==dataErrorToken)
return flDataError;
tffscpy(ioreq->irData,dirEntry,sizeof(DirectoryEntry));
if (ioreq->irFlags & FIND_BY_HANDLE)
toLE4(((DirectoryEntry FAR1 *) (ioreq->irData))->fileSize, tFile.fileSize);
}
return flOK;
}
/*----------------------------------------------------------------------*/
/* f l F i n d F i r s t F i l e */
/* */
/* Finds the first file entry in a directory. */
/* This function is used in combination with the flFindNextFile call, */
/* which returns the remaining file entries in a directory sequentially.*/
/* Entries are returned according to the unsorted directory order. */
/* flFindFirstFile creates a file handle, which is returned by it. Calls*/
/* to flFindNextFile will provide this file handle. When flFindNextFile */
/* returns 'noMoreEntries', the file handle is automatically closed. */
/* Alternatively the file handle can be closed by a 'closeFile' call */
/* before actually reaching the end of directory. */
/* A DirectoryEntry structure is copied to the user buffer describing */
/* each file found. This structure is defined in dosformt.h. */
/* */
/* Parameters: */
/* irHandle : Drive number (0, 1, ...) */
/* irPath : Specifies a directory path */
/* irData : Address of user buffer to receive a */
/* DirectoryEntry structure */
/* */
/* Returns: */
/* irHandle : File handle to use for subsequent operations. */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus findFirstFile(Volume vol, IOreq FAR2 *ioreq)
{
int i;
/* Look for an available file */
File *file = fileTable;
for (i = 0; i < FILES && (file->flags & FILE_IS_OPEN); i++, file++);
if (i >= FILES)
return flTooManyOpenFiles;
file->fileVol = &vol;
ioreq->irHandle = i; /* return file handle */
/* Find the path */
checkStatus(findDirEntry(file->fileVol,ioreq->irPath,file));
file->currentPosition = 0; /* located at file beginning */
file->flags |= FILE_IS_OPEN | FILE_READ_ONLY; /* this file now officially open */
return findNextFile(file,ioreq);
}
/*----------------------------------------------------------------------*/
/* g e t D i s k I n f o */
/* */
/* Returns general allocation information. */
/* */
/* The bytes/sector, sector/cluster, total cluster and free cluster */
/* information are returned into a DiskInfo structure. */
/* */
/* Parameters: */
/* ioreq->irData : Address of DiskInfo structure */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus getDiskInfo(Volume vol, IOreq FAR2 *ioreq)
{
unsigned i;
unsigned fatEntry;
DiskInfo FAR1 *diskInfo = (DiskInfo FAR1 *) ioreq->irData;
diskInfo->bytesPerSector = SECTOR_SIZE;
diskInfo->sectorsPerCluster = vol.sectorsPerCluster;
diskInfo->totalClusters = vol.maxCluster - 1;
diskInfo->freeClusters = 0; /* let's count them */
for (i = 2; i <= vol.maxCluster; i++) {
fatEntry = i;
checkStatus(getFATentry(&vol,&fatEntry));
if ( fatEntry== 0)
diskInfo->freeClusters++;
}
return flOK;
}
#ifndef FL_READ_ONLY
#ifdef RENAME_FILE
/*----------------------------------------------------------------------*/
/* r e n a m e F i l e */
/* */
/* Renames a file to another name. */
/* */
/* Parameters: */
/* ioreq->irPath : path of existing file */
/* ioreq->irData : path of new name. */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus renameFile(Volume vol, IOreq FAR2 *ioreq)
{
File file, file2; /* temporary files for searches */
DirectoryEntry *dirEntry, *dirEntry2;
FLStatus status;
FLSimplePath FAR1 *irPath2 = (FLSimplePath FAR1 *) ioreq->irData;
file.flags = 0;
checkStatus(findDirEntry(&vol,ioreq->irPath,&file));
file2.flags = FILE_MUST_OPEN;
status = findDirEntry(file.fileVol,irPath2,&file2);
if (status != flFileNotFound)
return status == flOK ? flFileAlreadyExists : status;
#ifndef VFAT_COMPATIBILITY
if (file.ownerDirCluster == file2.ownerDirCluster) { /* Same directory */
/* Change name in directory entry */
checkStatus(getDirEntryForUpdate(&file,&dirEntry));
setNameInDirEntry(dirEntry,irPath2);
}
else
#endif
{ /* not same directory */
/* Write new directory entry */
const DirectoryEntry FAR0 *dir;
checkStatus(getDirEntryForUpdate(&file2,&dirEntry2));
dir = getDirEntry(&file);
if(dir==NULL)
return flSectorNotFound;
if(dir==dataErrorToken)
return flDataError;
*dirEntry2 = *dir;
setNameInDirEntry(dirEntry2,irPath2);
/* Delete original entry */
checkStatus(getDirEntryForUpdate(&file,&dirEntry));
dirEntry->name[0] = DELETED_DIR_ENTRY;
}
return flOK;
}
#endif /* RENAME_FILE */
#endif /* FL_READ_ONLY */
#ifndef FL_READ_ONLY
#ifdef SUB_DIRECTORY
/*----------------------------------------------------------------------*/
/* m a k e D i r */
/* */
/* Creates a new directory. */
/* */
/* Parameters: */
/* ioreq->irPath : path of new directory. */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
FLStatus makeDir(Volume vol, IOreq FAR2 *ioreq)
{
File file; /* temporary file for searches */
unsigned dirBackPointer;
DirectoryEntry *dirEntry;
FLStatus status;
unsigned originalRover;
unsigned fatEntry;
file.flags = FILE_MUST_OPEN;
status = findDirEntry(&vol,ioreq->irPath,&file);
if (status != flFileNotFound)
return status == flOK ? flFileAlreadyExists : status;
/* Look for a free cluster. Start at the allocation rover */
originalRover = vol.allocationRover;
do {
vol.allocationRover++;
if (vol.allocationRover > vol.maxCluster)
vol.allocationRover = 2; /* wraparound to start of volume */
if (vol.allocationRover == originalRover)
return flNoSpaceInVolume;
fatEntry = vol.allocationRover;
checkStatus(getFATentry(&vol,&fatEntry));
} while ( fatEntry!= FAT_FREE);
/* Found a free cluster. Mark it as an end of chain */
checkStatus(setFATentry(&vol,vol.allocationRover,FAT_LAST_CLUSTER));
/* Create the directory entry for the new dir */
checkStatus(getDirEntryForUpdate(&file,&dirEntry));
setNameInDirEntry(dirEntry,ioreq->irPath);
dirEntry->attributes = ATTR_ARCHIVE | ATTR_DIRECTORY;
toLE2(dirEntry->startingCluster,vol.allocationRover);
toLE4(dirEntry->fileSize,0);
setCurrentDateTime(dirEntry);
/* Remember the back pointer to owning directory for the ".." entry */
dirBackPointer = (unsigned) file.ownerDirCluster;
file.flags |= FILE_IS_DIRECTORY;
file.currentPosition = 0;
file.fileSize = 0;
return extendDirectory(&file,dirBackPointer);
}
#endif /* SUB_DIRECTORY */
#ifdef SPLIT_JOIN_FILE
/*------------------------------------------------------------------------*/
/* j o i n F i l e */
/* */
/* joins two files. If the end of the first file is on a cluster */
/* boundary, the files will be joined there. Otherwise, the data in */
/* the second file from the beginning until the offset that is equal to */
/* the offset in cluster of the end of the first file will be lost. The */
/* rest of the second file will be joined to the first file at the end of */
/* the first file. On exit, the first file is the expanded file and the */
/* second file is deleted. */
/* Note: The second file will be open by this function, it is advised to */
/* close it before calling this function in order to avoid */
/* inconsistencies. */
/* */
/* Parameters: */
/* file : file to join to. */
/* irPath : Path name of the file to be joined. */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed. */
/* */
/*------------------------------------------------------------------------*/
FLStatus joinFile (File *file, IOreq FAR2 *ioreq)
{
Volume vol = file->fileVol;
File joinedFile;
DirectoryEntry *joinedDirEntry;
unsigned offsetInCluster = (unsigned)(file->fileSize % vol.bytesPerCluster);
if (file->flags & FILE_READ_ONLY)
return flNoWriteAccess;
if (file->flags & FILE_IS_DIRECTORY)
return flFileIsADirectory;
/* open the joined file. */
joinedFile.flags = 0;
checkStatus(findDirEntry(file->fileVol,ioreq->irPath,&joinedFile));
joinedFile.currentPosition = 0;
/* Check if the two files are the same file. */
if (file->directorySector == joinedFile.directorySector &&
file->directoryIndex == joinedFile.directoryIndex)
return flBadFileHandle;
file->flags |= FILE_MODIFIED;
if (joinedFile.fileSize > (long)offsetInCluster) { /* the joined file extends
beyond file's end of file.*/
unsigned lastCluster, nextCluster, firstCluster;
const DirectoryEntry FAR0 *dir;
dir = getDirEntry(&joinedFile);
if(dir==NULL)
return flSectorNotFound;
if(dir==dataErrorToken)
return flDataError;
/* get the first cluster of the joined file. */
firstCluster = LE2(dir->startingCluster);
if (file->fileSize) { /* the file is not empty.*/
/* find the last cluster of file by following the FAT chain.*/
if (file->currentCluster == 0) { /* start from the first cluster.*/
const DirectoryEntry FAR0 *dir;
dir = getDirEntry(file);
if(dir==NULL)
return flSectorNotFound;
if(dir==dataErrorToken)
return flDataError;
nextCluster = LE2(dir->startingCluster);
}
else /* start from the current cluster.*/
nextCluster = file->currentCluster;
/* follow the FAT chain.*/
while (nextCluster != FAT_LAST_CLUSTER) {
if (nextCluster < 2 || nextCluster > vol.maxCluster)
return flInvalidFATchain;
lastCluster = nextCluster;
checkStatus(getFATentry(&vol,&nextCluster));
}
}
else /* the file is empty. */
lastCluster = 0;
if (offsetInCluster) { /* join in the middle of a cluster.*/
SectorNo sectorNo, joinedSectorNo, tempSectorNo;
unsigned offset, joinedOffset, numOfSectors = 1, i;
const char FAR0 *startCopy;
unsigned fatEntry;
/* get the sector and offset of the end of the file.*/
file->currentPosition = file->fileSize;
file->currentCluster = lastCluster;
checkStatus(getSectorAndOffset(file, &sectorNo, &offset));
/* load the sector of the end of the file to the buffer.*/
checkStatus(updateSector(&vol, sectorNo, TRUE));
/* copy the second part of the first cluster of the joined file
to the end of the last cluster of the original file.*/
/* first set the current position of the joined file.*/
joinedFile.currentPosition = offsetInCluster;
joinedFile.currentCluster = firstCluster;
/* get the relevant sector in the joined file.*/
checkStatus(getSectorAndOffset(&joinedFile, &joinedSectorNo, &joinedOffset));
/* map sector and offset.*/
startCopy = (const char FAR0 *) findSector(&vol,joinedSectorNo) + joinedOffset;
if (startCopy == NULL)
return flSectorNotFound;
if(startCopy==dataErrorToken)
return flDataError;
/* copy.*/
tffscpy(vol.volBuffer.flData + offset, startCopy, SECTOR_SIZE - offset);
checkStatus(flushBuffer(&vol));
/* find how many sectors should still be copied (the number of sectors
until the end of the current cluster).*/
tempSectorNo = firstSectorOfCluster(&vol,lastCluster);
while(tempSectorNo != sectorNo) {
tempSectorNo++;
numOfSectors++;
}
/* copy the rest of the sectors in the current cluster.
this is done by loading a sector from the joined file to the buffer,
changing the sectoNo of the buffer to the relevant sector in file
and then flushing the buffer.*/
sectorNo++;
joinedSectorNo++;
for(i = 0; i < vol.sectorsPerCluster - numOfSectors; i++) {
checkStatus(updateSector(&vol,joinedSectorNo, TRUE));
vol.volBuffer.sectorNo = sectorNo;
checkStatus(flushBuffer(&vol));
sectorNo++;
joinedSectorNo++;
}
fatEntry = firstCluster;
checkStatus(getFATentry(&vol,&fatEntry));
/* adjust the FAT chain.*/
checkStatus(setFATentry(&vol,
lastCluster,
fatEntry));
/* mark the first cluster of the joined file as free */
checkStatus(setFATentry(&vol,firstCluster,FAT_FREE));
vol.volBuffer.checkPoint = TRUE;
/* mark sectors free */
checkStatus(vol.tl.deleteSector(vol.tl.rec,firstSectorOfCluster(&vol,firstCluster),
vol.sectorsPerCluster));
}
else { /* join on a cluster boundary.*/
if (lastCluster) { /* file is not empty. */
checkStatus(setFATentry(&vol,lastCluster, firstCluster));
}
else { /* file is empty.*/
DirectoryEntry *dirEntry;
checkStatus(getDirEntryForUpdate(file, &dirEntry));
toLE2(dirEntry->startingCluster, firstCluster);
setCurrentDateTime(dirEntry);
}
}
/*adjust the size of the expanded file.*/
file->fileSize += joinedFile.fileSize - offsetInCluster;
/* mark the directory entry of the joined file as deleted.*/
checkStatus(getDirEntryForUpdate(&joinedFile, &joinedDirEntry));
joinedDirEntry->name[0] = DELETED_DIR_ENTRY;
}
else /* the joined file is too small all is left to do is delete it */
checkStatus(deleteFile (&vol, ioreq, FALSE));
return flOK;
}
/*------------------------------------------------------------------------*/
/* s p l i t F i l e */
/* */
/* Splits the file into two files. The original file contains the first */
/* part, and a new file (which is created for that purpose) contains */
/* the second part. If the current position is on a cluster */
/* boundary, the file will be split at the current position. Otherwise, */
/* the cluster of the current position is duplicated, one copy is the */
/* first cluster of the new file, and the other is the last cluster of the*/
/* original file, which now ends at the current position. */
/* */
/* Parameters: */
/* file : file to split. */
/* irPath : Path name of the new file. */
/* */
/* Returns: */
/* irHandle : handle of the new file. */
/* FLStatus : 0 on success, otherwise failed. */
/* */
/*------------------------------------------------------------------------*/
FLStatus splitFile (File *file, IOreq FAR2 *ioreq)
{
Volume vol = file->fileVol;
File *newFile, dummyFile;
IOreq ioreq2;
FLStatus status;
unsigned fatEntry;
if (file->flags & FILE_READ_ONLY)
return flNoWriteAccess;
if (file->flags & FILE_IS_DIRECTORY)
return flFileIsADirectory;
/* check if the path of the new file already exists.*/
dummyFile.flags = 0;
status = findDirEntry(&vol,ioreq->irPath,&dummyFile);
if (status != flFileNotFound) {
if (status == flOK) /* there is a file with that path.*/
return flFileAlreadyExists;
else
return status;
}
/* open the new file.*/
ioreq2.irFlags = OPEN_FOR_WRITE;
ioreq2.irPath = ioreq->irPath;
checkStatus(openFile(&vol,&ioreq2));
newFile = fileTable + ioreq2.irHandle;
newFile->flags |= FILE_MODIFIED;
file->flags |= FILE_MODIFIED;
if (file->currentPosition % vol.bytesPerCluster) { /* not on a cluster boundary.*/
SectorNo sectorNo, newSectorNo, lastSector;
int i;
if((status = allocateCluster(newFile)) != flOK) {
newFile->flags = 0; /* close the new file */
return status;
}
sectorNo = firstSectorOfCluster(&vol,file->currentCluster);
newSectorNo = firstSectorOfCluster(&vol,newFile->currentCluster);
/* deal with split in a last not full cluster */
fatEntry = file->currentCluster;
checkStatus(getFATentry(&vol,&fatEntry));
if (fatEntry == FAT_LAST_CLUSTER)
lastSector = ((file->fileSize - 1) % vol.bytesPerCluster)/SECTOR_SIZE +
sectorNo;
else
lastSector = sectorNo + vol.sectorsPerCluster; /* out of the cluster */
/* copy the current cluster of the original file to the first cluster
of the new file, sector after sector.*/
for(i = 0; i < (int)vol.sectorsPerCluster; i++) {
if((status = updateSector(&vol,sectorNo, TRUE)) != flOK) {
newFile->flags = 0; /* close the new file */
return status;
}
vol.volBuffer.sectorNo = newSectorNo;
if((status = flushBuffer(&vol)) != flOK) {
newFile->flags = 0; /* close the new file */
return status;
}
sectorNo++;
newSectorNo++;
if(sectorNo > lastSector)
break;
}
fatEntry = file->currentCluster;
checkStatus(getFATentry(&vol,&fatEntry));
/* adjust the FAT chain of the new file.*/
if((status = setFATentry(&vol,newFile->currentCluster,
fatEntry)) != flOK) {
newFile->flags = 0; /* close the new file */
return status;
}
/* mark current cluster 0 (as current position).*/
newFile->currentCluster = 0;
}
else { /* on a cluster boundary.*/
DirectoryEntry *newDirEntry;
/* adjust the directory entry of the new file.*/
if((status = getDirEntryForUpdate(newFile,&newDirEntry)) != flOK) {
newFile->flags = 0; /* close the new file */
return status;
}
if (file->currentPosition) { /* split at the middle of the file.*/
fatEntry = file->currentCluster;
checkStatus(getFATentry(&vol,&fatEntry));
toLE2(newDirEntry->startingCluster, fatEntry);
setCurrentDateTime(newDirEntry);
}
else { /* split at the beginning of the file.*/
DirectoryEntry *dirEntry;
const DirectoryEntry FAR0 *dir;
dir = getDirEntry(file);
if(dir==NULL)
return flSectorNotFound;
if(dir==dataErrorToken)
return flDataError;
/* first cluster of file becomes the first cluster of the new file.*/
toLE2(newDirEntry->startingCluster,LE2(dir->startingCluster));
setCurrentDateTime(newDirEntry);
/* starting cluster of file becomes 0.*/
if((status = getDirEntryForUpdate(file, &dirEntry)) != flOK) {
newFile->flags = 0; /* close the new file */
return status;
}
toLE2(dirEntry->startingCluster, 0);
setCurrentDateTime(dirEntry);
}
}
/* adjust the size of the new file.*/
newFile->fileSize = file->fileSize - file->currentPosition +
(file->currentPosition % vol.bytesPerCluster);
/* adjust the chain and size of the original file.*/
if (file->currentPosition) /* we didn't split at the beginning.*/
if((status = setFATentry(&vol,file->currentCluster, FAT_LAST_CLUSTER)) != flOK) {
newFile->flags = 0; /* close the new file */
return status;
}
file->fileSize = file->currentPosition;
/* return to the user the handle of the new file.*/
ioreq->irHandle = ioreq2.irHandle;
return flOK;
}
#endif /* SPLIT_JOIN_FILE */
#endif /* FL_READ_ONLY */
/*----------------------------------------------------------------------*/
/* I n i t F S */
/* */
/* Initializes the FLite file system. */
/* */
/* Calling this function is optional. If it is not called, */
/* initialization will be done automatically on the first FLite call. */
/* This function is provided for those applications who want to */
/* explicitly initialize the system and get an initialization status. */
/* */
/* Calling flInit after initialization was done has no effect. */
/* */
/* Parameters: */
/* None */
/* */
/* Returns: */
/* FLStatus : 0 on success, otherwise failed */
/*----------------------------------------------------------------------*/
void initFS()
{
unsigned i;
unsigned volNo;
Volume vol = vols;
for (volNo = 0; volNo < VOLUMES; volNo++, pVol++) {
vol.volBuffer.dirty = FALSE;
vol.volBuffer.owner = NULL;
vol.volBuffer.sectorNo = UNASSIGNED_SECTOR; /* Current sector no. (none) */
vol.volBuffer.checkPoint = FALSE;
}
for (i = 0; i < FILES; i++)
fileTable[i].flags = 0;
}
#endif
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