//*************************************************************************************
// Function: CETYPE FS_CreateFile ( const char * FileName,
// FILE_MODE mode,
// FSFILE* filePtr )
// Summary: Creates/Opens a file with ascii name provided in FileName
// Input:
// FileName - The name of the file to open
// mode - File open mode (FILE_MODE enum)
// - FS_CREATE_NEW - Create a new file or replace an existing file.
// - FS_OPEN_EXISTING - Open existing file for read/write access or
// creates a new file; file is positioned at the
// beginning.
// - FS_APPEND - Open existing file for read/write access or
// creates a new file; file is positioned just
// past the last byte.
// - FS_READ_ONLY - Open existing file in read-only mode; file
// positioned at the beginning.
// filePtr - pointer to FSFILE data structure that will be confi-
// gured ro provide access to the file if function
// succeeds.
// Return Values:
// CETYPE - Expected CE_GOOD, but may have other codes depending on
// various error conditions.
// Description:
// This function will create and/or open specified file.
// The specified file name will be formatted to ensure that it's in 8.3
// format. Next, the search for the specified file name will be
// performed. If the name is found, the action will be taken based
// upon the requested File Mode.
//*************************************************************************************
CETYPE FS_CreateFile ( const char* FileName, FILE_MODE mode, FSFILE* filePtr )
{
//----------------------------------------------------------------
// Validate conditions and parameters
//----------------------------------------------------------------
if (!SDFS_InitStatus)
return CE_NOT_INIT; // FS is not initialized!
if (NULL == FileName)
return CE_INVALID_ARGUMENT;
if (NULL == filePtr)
return CE_INVALID_ARGUMENT;
//-----------------------------------------------------------------
CETYPE RC = CE_GOOD;
char fmtName[NAME_SIZE_8r3];
//-----------------------------------------------------------------
// Validate new name and convert it to 8.3 FAT format
//-----------------------------------------------------------------
if ( !SDFS_Format8dot3Name(FileName, fmtName, FALSE) )
return CE_INVALID_FILENAME;
//================================================================
// Make sure that the name provided is unique...
//----------------------------------------------------------------
FS_SeekStart(&SDFS_CWD); // Rewind Current Working Directory
RC = SDFS_DirFindNext(&SDFS_CWD, filePtr, ATTR_NONE, ATTR_NONE, fmtName);
//----------------------------------------------------------------
if (CE_EOF == RC)
// There is no object with the same name
goto NotFound;
//----------------------------------------------------------------
if (CE_GOOD != RC)
// Some other error (except for CE_EOF) had happened...
return RC;
//----------------------------------------------------------------
if ( FS_IsDirectory(filePtr) )
// The object found is a Directory...
{
SDFS_InitFSFILE(filePtr, NULL, ATTR_NONE); // Reset output FSFILE structure
return CE_FILENAME_EXISTS;
}
//----------------------------------------------------------------
//================================================================
// The file with the specified name present on the disk...
//----------------------------------------------------------------
switch(mode)
{
case FS_CREATE_NEW:
// File exists, we want to create a new one, so remove it first
if ( CE_GOOD != (RC = FS_Delete(filePtr)) )
// Delete failed...
{
SDFS_InitFSFILE(filePtr, NULL, ATTR_NONE); // Reset output FSFILE structure
return RC;
}
//-----------------------------------------
// Nope, does not exist any more :)
goto NotFound;
case FS_APPEND:
// File exists, we want to position it at the end
if ( CE_GOOD != (RC = FS_SeekEnd(filePtr)) )
// Seek failed...
{
SDFS_InitFSFILE(filePtr, NULL, ATTR_NONE); // Reset output FSFILE structure
return RC;
}
//-----------------------------------------
// Everything is fine!
return CE_GOOD;
case FS_READ_ONLY:
// Set READONLY attribute on the FO data structure to prevent WRITEs
filePtr->dirFileEntry.DIR_Attr |= ATTR_READONLY;
// Fall-through to OPEN_EXISTING
case FS_OPEN_EXISTING:
FS_SeekStart(filePtr);
return CE_GOOD;
default:
SDFS_InitFSFILE(filePtr, NULL, ATTR_NONE); // Reset output FSFILE structure
return CE_INVALID_ARGUMENT;
}
//================================================================
// The file with the specified name does not exist on disk...
//----------------------------------------------------------------
NotFound:
switch(mode)
{
case FS_CREATE_NEW:
case FS_APPEND:
case FS_OPEN_EXISTING:
// For all of the cases above proceed to creating new file
break;
case FS_READ_ONLY:
// Bad luck...
SDFS_InitFSFILE(filePtr, NULL, ATTR_NONE); // Reset output FSFILE structure
return CE_NOT_FOUND;
default:
SDFS_InitFSFILE(filePtr, NULL, ATTR_NONE); // Reset output FSFILE structure
return CE_INVALID_ARGUMENT;
}
//================================================================
// Now it is time to create a new file
//----------------------------------------------------------------
// First, try to create Directory Entry
//----------------------------------------------------------------
if ( (RC = SDFS_DirFindEmpty(&SDFS_CWD, filePtr)) != CE_GOOD)
return RC; // Could not create directory entry...
//----------------------------------------------------------------
// Second, allocate a cluster to the file
//----------------------------------------------------------------
if ( CE_GOOD != (RC = SDFS_ClusterAllocateNew(filePtr)) )
{
SDFS_InitFSFILE(filePtr, NULL, ATTR_NONE); // Reset output FSFILE structure
return RC;
}
//----------------------------------------------------------------
// Third, set the name and Attributes of the new entry
//----------------------------------------------------------------
memcpy(filePtr->dirFileEntry.DIR_Name, fmtName, NAME_SIZE_8r3);
filePtr->dirFileEntry.DIR_Attr = ATTR_ARCHIVE;
//----------------------------------------------------------------
// That's basically it - just need to save changes to disk
//----------------------------------------------------------------
return FS_Flush(filePtr);
}
//*********************************************************************************
// Function: CETYPE FS_Write(FSFILE* filePtr, const void* origin, WORD length)
// Summary: Write data to a file
// Conditions: File opened in FS_CREATE_NEW, FS_APPEND, or FS_OPEN_EXISTING mode
// Input:
// filePtr - Pointer to file structure
// origin - Pointer to source buffer
// length - Length of the source buffer (data to write)
// Return:
// CETYPE - Error code (expected: CE_GOOD)
// Description:
// The FS_Write function will write data to a file. First, the sector
// that corresponds to the current position in the file will be loaded
// (if it hasn't already been cached in the global data buffer). Data
// will then be written to the device from the specified buffer until
// the specified amount has been written.
// If the end of a cluster is reached, the next cluster will be
// loaded, unless the end-of-file flag for the specified file has been
// set. If it has, a new cluster will be allocated to the file. Finally,
// the new position and filesize will be stored in the FSFILE object.
//*********************************************************************************
CETYPE FS_Write(FSFILE* filePtr, const void* origin, WORD length )
{
//----------------------------------------------------------------
// Validate conditions and parameters
//----------------------------------------------------------------
if (!SDFS_InitStatus)
return CE_NOT_INIT; // FS is not initialized!
if (NULL == filePtr)
return CE_INVALID_ARGUMENT;
//----------------------------------------------------------------
// Check if the file attributes allow write
if( (filePtr->dirFileEntry.DIR_Attr & ATTR_READONLY) == ATTR_READONLY )
return CE_READONLY;
// Check if pointer is valid
if (origin == NULL)
return CE_INVALID_ARGUMENT;
// Check if length is valid
if (length == 0)
return CE_INVALID_ARGUMENT;
//-----------------------------------------------------------------
DWORD LBA;
BYTE* ptrFrom = (BYTE*)origin;
WORD ChunkSize;
CETYPE RC;
// Write data to the file
//{
//------------------------------------------------------------
// Loop while writing bytes, exit loop if:
// * All bytes are written
// * Error encountered
//------------------------------------------------------------
while (length > 0)
{
//----------------------------------------------------
// Make sure we have defined a place to write to
//----------------------------------------------------
//{
if (filePtr->fileCrntSecPos == SDFS_VolumeInfo.sectorSize)
{
//----------------------------------------------------
// Current sector is filled in...
//----------------------------------------------------
// NOTE: fileCrntSec is a 0-based counter (index)
//----------------------------------------------------
if (filePtr->fileCrntSec == SDFS_VolumeInfo.SecPerClus - 1)
{
//----------------------------------------------------
// Current cluster is exhausted - move to the next one
//----------------------------------------------------
RC = SDFS_ClusterGetNext(filePtr);
if ( CE_EOF == RC )
// Oops! Reached end-of-file - try to add another cluster
RC = SDFS_ClusterAllocateNew(filePtr);
//----------------------------------------------------
if ( CE_GOOD != RC )
// Bad luck - no cluster to advance to!
return RC;
}
else
{
// It is safe to move to the next sector in the current cluster
filePtr->fileCrntSec++; // move to the next sector
filePtr->fileCrntSecPos = 0; // reset position
}
//----------------------------------------------------
}
//}
//-----------------------------------------------------------------
LBA = SDFS_FATClusterToLBA( filePtr->fileCrntCls)
+ filePtr->fileCrntSec; // add the sector number to it
ChunkSize = length <= SDFS_VolumeInfo.sectorSize - filePtr->fileCrntSecPos ?
length
: SDFS_VolumeInfo.sectorSize - filePtr->fileCrntSecPos;
//-----------------------------------------------------------------
if (CE_GOOD != (RC = SDFS_DataCacheWrite (LBA, ptrFrom, filePtr->fileCrntSecPos, ChunkSize )))
return RC;
//-----------------------------------------------------------------
length -= ChunkSize;
ptrFrom += ChunkSize;
//----------------------
filePtr->fileCrntSecPos += ChunkSize;
filePtr->fileSeek += ChunkSize;
if (filePtr->dirFileEntry.DIR_FileSize < filePtr->fileSeek)
filePtr->dirFileEntry.DIR_FileSize = filePtr->fileSeek;
}
//-----------------------------------
return CE_GOOD;
} // write
//*********************************************************************************
// Function: CETYPE FS_WriteSector(FSFILE* filePtr, const void* origin)
// Summary: Write data to a file one sector at a time bypassing CACHE
// Conditions: File opened in FS_CREATE_NEW, FS_APPEND, or FS_OPEN_EXISTING mode
// Input:
// filePtr - Pointer to file structure
// origin - Pointer to source buffer
// Return:
// CETYPE - Error code (expected: CE_GOOD)
// Description:
// The FS_WriteSector function will write data to a file one sector
// at a time bypassing CACHE. The length of the data buffer pointed
// to by "orogin" expected to be equal to the size of the sector.
// If the end of a cluster is reached, the next cluster will be
// loaded, unless the end-of-file flag for the specified file has been
// set. If it has, a new cluster will be allocated to the file. Finally,
// the new position and filesize will be stored in the FSFILE object.
//*********************************************************************************
CETYPE FS_WriteSector(FSFILE* filePtr, const void* origin)
{
//----------------------------------------------------------------
// Validate conditions and parameters
//----------------------------------------------------------------
if (!SDFS_InitStatus)
return CE_NOT_INIT; // FS is not initialized!
if (NULL == filePtr)
return CE_INVALID_ARGUMENT;
//----------------------------------------------------------------
// Check if the file attributes allow write
if( (filePtr->dirFileEntry.DIR_Attr & ATTR_READONLY) == ATTR_READONLY )
return CE_READONLY;
// Check if pointer is valid
if (origin == NULL)
return CE_INVALID_ARGUMENT;
//-----------------------------------------------------------------
DWORD LBA;
BYTE* ptrFrom = (BYTE*)origin;
WORD ChunkSize;
CETYPE RC;
//----------------------------------------------------
// Make sure we have defined a place to write to
//----------------------------------------------------
if (0 != filePtr->fileCrntSecPos)
// For Sector writes we always start at the EMPTY
// sector, so the rest of the current sector will
// be skipped...
{
// NOTE: fileCrntSec is a 0-based counter (index)
//----------------------------------------------------
if (filePtr->fileCrntSec == SDFS_VolumeInfo.SecPerClus - 1)
{
//----------------------------------------------------
// Current cluster is exhausted - move to the next one
//----------------------------------------------------
RC = SDFS_ClusterGetNext(filePtr);
if ( CE_EOF == RC )
// Oops! Reached end-of-file - try to add another cluster
RC = SDFS_ClusterAllocateNew(filePtr);
//----------------------------------------------------
if ( CE_GOOD != RC )
// Bad luck - no cluster to advance to!
return RC;
}
else
{
// It is safe to move to the next sector in the current cluster
filePtr->fileCrntSec++; // move to the next sector
filePtr->fileCrntSecPos = 0; // reset position
}
}
//-----------------------------------------------------------------
LBA = SDFS_FATClusterToLBA( filePtr->fileCrntCls)
+ filePtr->fileCrntSec; // add the sector number to it
ChunkSize = SDFS_VolumeInfo.sectorSize;
//-----------------------------------------------------------------
if ( !SD_SPI_SectorWrite(LBA, ptrFrom, FALSE) )
return CE_WRITE_ERROR;
//-----------------------------------------------------------------
filePtr->fileCrntSecPos += ChunkSize;
filePtr->fileSeek += ChunkSize;
if (filePtr->dirFileEntry.DIR_FileSize < filePtr->fileSeek)
filePtr->dirFileEntry.DIR_FileSize = filePtr->fileSeek;
//-----------------------------------
return CE_GOOD;
} // write
//*************************************************************************************
// Function: CETYPE FS_mkDir (char * Name, ATTR_TYPE Attr, FSFILE* newDir)
//-------------------------------------------------------------------------------------
// Summary: Creates directory with the specified name in the current working
// directory.
// Input:
// Name - Name of the new directory
// Attr - Additional attributes of the new directory
// newDir - pointer to the File Object structure that on SUCCESS
// will be set to the newly created directory.
// Return Values:
// CETYPE enum member (expected CE_GOOD)
// Other codes depending on encountered error conditions
//*************************************************************************************
CETYPE FS_mkDir (char * Name, ATTR_TYPE Attr, FSFILE* newDir)
{
//----------------------------------------------------------------
// Validate conditions and parameters
//----------------------------------------------------------------
if (!SDFS_InitStatus)
return CE_NOT_INIT; // FS is not initialized!
if (NULL == Name)
return CE_INVALID_FILENAME;
if (NULL == newDir)
return CE_INVALID_ARGUMENT;
//----------------------------------------------------------------
char fmtName[NAME_SIZE_8r3];
CETYPE RC;
//----------------------------------------------------------------
// Verify/Format provided Directory name (for direct match)
//----------------------------------------------------------------
if ( !SDFS_Format8dot3Name (Name, fmtName, FALSE) )
return CE_INVALID_FILENAME; // Invalid/missing name
//----------------------------------------------------------------
// Make sure that the name provided is unique...
//----------------------------------------------------------------
FS_SeekStart(&SDFS_CWD); // Rewind Current Working Directory
RC = SDFS_DirFindNext(&SDFS_CWD, newDir, ATTR_NONE, ATTR_NONE, fmtName);
//----------------------------------------------------------------
if (CE_GOOD == RC)
{
if ( FS_IsDirectory(newDir) )
// Directory with the same name is found...
return CE_GOOD;
else
// There exists file with the same name...
{
SDFS_InitFSFILE(newDir, NULL, ATTR_NONE); // Reset output FSFILE structure
return CE_FILENAME_EXISTS;
}
}
if (CE_EOF != RC)
return RC; // Some other error happend on the way...
//----------------------------------------------------------------
// The name provided is unique; Try to create Directory Entry
//----------------------------------------------------------------
if ( (RC = SDFS_DirFindEmpty(&SDFS_CWD, newDir)) != CE_GOOD)
return RC; // Could not create directory entry...
//----------------------------------------------------------------
// Success; Set the name and Attributes of the new entry
//----------------------------------------------------------------
memcpy(newDir->dirFileEntry.DIR_Name, fmtName, NAME_SIZE_8r3);
newDir->dirFileEntry.DIR_Attr = ATTR_DIRECTORY | ATTR_ARCHIVE;
//----------------------------------------------------------------
// Allocate a cluster for the new Directory and create mandatory
// "." and ".." entries
//----------------------------------------------------------------
if ( (RC = SDFS_ClusterAllocateNew(newDir)) != CE_GOOD)
// Failure allocating cluster...
{
SDFS_InitFSFILE(newDir, NULL, ATTR_NONE); // Reset output FSFILE structure
return RC;
}
//----------------------------------------------------------------
DIRENTRY spcDir;
DWORD dirCluster;
// Set template Directory record for "." and ".." entries
SDFS_DirResetEntry( &spcDir, NULL, ATTR_DIRECTORY);
//----------------------------------------------------------------
// Create and store "." entry
//----------------------------------------------------------------
spcDir.DIR_Name[0] = '.';
dirCluster = SDFS_DirGetFirstCluster(&newDir->dirFileEntry);
SDFS_DirSetFirstCluster (&spcDir, dirCluster);
FS_Write(newDir, &spcDir, sizeof(DIRENTRY));
//----------------------------------------------------------------
// Create and store ".." entry
//----------------------------------------------------------------
spcDir.DIR_Name[1] = '.';
dirCluster = SDFS_DirGetFirstCluster(&SDFS_CWD.dirFileEntry);
if (dirCluster == SDFS_VolumeInfo.rootClsN)
// Parent is the Root directory of the volume
dirCluster = 0; // FAT32 rule for pointers to Root
SDFS_DirSetFirstCluster (&spcDir, dirCluster);
FS_Write(newDir, &spcDir, sizeof(DIRENTRY));
//----------------------------------------------------------------
return FS_Flush(newDir);
}
