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#include "compound-file.h"
#include "compound-file-difat.h"
#include "compound-file-header.h"
#include "compound-file-fat.h"
#include "compound-file-common.h"
#include "emb-logging.h"
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
static unsigned int sizeOfDirectoryEntry = 128;
static unsigned int sectorSize(bcf_file* bcfFile)
{
/* version 3 uses 512 byte */
if(bcfFile->header.majorVersion == 3)
{
return 512;
}
else if(bcfFile->header.majorVersion == 4)
{
return 4096;
}
return 4096;
}
static int haveExtraDIFATSectors(bcf_file* file)
{
return (int)(numberOfEntriesInDifatSector(file->difat) > 0);
}
static int seekToOffset(EmbFile* file, const unsigned int offset)
{
return embFile_seek(file, offset, SEEK_SET);
}
static int seekToSector(bcf_file* bcfFile, EmbFile* file, const unsigned int sector)
{
unsigned int offset = sector * sectorSize(bcfFile) + sectorSize(bcfFile);
return seekToOffset(file, offset);
}
static void parseDIFATSectors(EmbFile* file, bcf_file* bcfFile)
{
unsigned int numberOfDifatEntriesStillToRead = bcfFile->header.numberOfFATSectors - NumberOfDifatEntriesInHeader;
unsigned int difatSectorNumber = bcfFile->header.firstDifatSectorLocation;
while((difatSectorNumber != CompoundFileSector_EndOfChain) &&
(numberOfDifatEntriesStillToRead > 0 ))
{
seekToSector(bcfFile, file, difatSectorNumber);
difatSectorNumber = readFullSector(file, bcfFile->difat, &numberOfDifatEntriesStillToRead);
}
}
int bcfFile_read(EmbFile* file, bcf_file* bcfFile)
{
unsigned int i, numberOfDirectoryEntriesPerSector, directorySectorToReadFrom;
bcfFile->header = bcfFileHeader_read(file);
if(!bcfFileHeader_isValid(bcfFile->header))
{
printf( "Failed to parse header\n" );
return 0;
}
bcfFile->difat = bcf_difat_create(file, bcfFile->header.numberOfFATSectors, sectorSize(bcfFile));
if(haveExtraDIFATSectors(bcfFile))
{
parseDIFATSectors(file, bcfFile);
}
bcfFile->fat = bcfFileFat_create(sectorSize(bcfFile));
for(i = 0; i < bcfFile->header.numberOfFATSectors; ++i)
{
unsigned int fatSectorNumber = bcfFile->difat->fatSectorEntries[i];
seekToSector(bcfFile, file, fatSectorNumber);
loadFatFromSector(bcfFile->fat, file);
}
numberOfDirectoryEntriesPerSector = sectorSize(bcfFile) / sizeOfDirectoryEntry;
bcfFile->directory = CompoundFileDirectory(numberOfDirectoryEntriesPerSector);
directorySectorToReadFrom = bcfFile->header.firstDirectorySectorLocation;
while(directorySectorToReadFrom != CompoundFileSector_EndOfChain)
{
seekToSector(bcfFile, file, directorySectorToReadFrom);
readNextSector(file, bcfFile->directory);
directorySectorToReadFrom = bcfFile->fat->fatEntries[directorySectorToReadFrom];
}
return 1;
}
EmbFile* GetFile(bcf_file* bcfFile, EmbFile* file, char* fileToFind)
{
int filesize, sectorSize, currentSector, sizeToWrite, currentSize, totalSectors, i;
char* input = 0;
EmbFile* fileOut = embFile_tmpfile();
bcf_directory_entry* pointer = bcfFile->directory->dirEntries;
while(pointer)
{
if(strcmp(fileToFind, pointer->directoryEntryName) == 0)
break;
pointer = pointer->next;
}
filesize = pointer->streamSize;
sectorSize = bcfFile->difat->sectorSize;
input = (char*)malloc(sectorSize);
if(!input) { embLog_error("compound-file.c GetFile(), cannot allocate memory for input\n"); } /* TODO: avoid crashing. null pointer will be accessed */
currentSize = 0;
currentSector = pointer->startingSectorLocation;
totalSectors = (int)ceil((float)filesize / sectorSize);
for(i = 0; i < totalSectors; i++)
{
seekToSector(bcfFile, file, currentSector);
sizeToWrite = filesize - currentSize;
if(sectorSize < sizeToWrite)
{
sizeToWrite = sectorSize;
}
embFile_read(input, 1, sizeToWrite, file);
embFile_write(input, 1, sizeToWrite, fileOut);
currentSize += sizeToWrite;
currentSector = bcfFile->fat->fatEntries[currentSector];
}
free(input);
input = 0;
return fileOut;
}
void bcf_file_free(bcf_file* bcfFile)
{
bcf_file_difat_free(bcfFile->difat);
bcfFile->difat = 0;
bcf_file_fat_free(bcfFile->fat);
bcfFile->fat = 0;
bcf_directory_free(bcfFile->directory);
bcfFile->directory = 0;
free(bcfFile);
bcfFile = 0;
}
/* kate: bom off; indent-mode cstyle; indent-width 4; replace-trailing-space-save on; */
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