xmount.c
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xmount.c
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	/*******************************************************************************
	* xmount Copyright (c) 2008,2009 by Gillen Daniel <gillen.dan@pinguin.lu> *
	* *
	* xmount is a small tool to "fuse mount" various image formats as dd or vdi *
	* files and enable virtual write access. *
	* *
	* 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/>. *
	*******************************************************************************/

	// TODO: Should be defined later by configure script in function to which libs
	// it finds and what input image types are supported
	#undef HAVE_LIBAFF

	#include "config.h"
	#include <stdio.h>
	#include <string.h>
	#include <stdlib.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <linux/fs.h>
	#include <semaphore.h>
	#include <endian.h>
	#include <stdint.h>
	#ifdef HAVE_LIBEWF
	#include <libewf.h>
	#endif
	#ifdef HAVE_LIBAFF
	//#include <libaff.h>
	#endif
	#include "xmount.h"

	// Some constant values
	#define IMAGE_INFO_HEADER "The following values have been extracted from " \
	"the mounted image file:\n\n"
	#define VDI_FILE_COMMENT "<<< This is a virtual VDI image >>>"
	#define VDI_HEADER_COMMENT "This VDI was emulated using xmount v" \
	PACKAGE_VERSION

	// Struct that contains various runtime configuration options
	static TXMountConfData XMountConfData;
	// Handles for input image types
	static FILE *hDdFile=NULL;
	#ifdef HAVE_LIBEWF
	static LIBEWF_HANDLE *hEwfFile=NULL;
	#endif
	#ifdef HAVE_LIBAFF
	//static AFILE *hAffFile=NULL;
	#endif
	// Pointer to virtual info file
	static char *pVirtualImageInfoFile=NULL;
	// Vars needed for VMDK emulation
	static char *pVirtualVmdkFile=NULL;
	// Vars needed for VDI emulation
	static TVdiFileHeader *pVdiFileHeader=NULL;
	static uint32_t VdiFileHeaderSize=0;
	static char *pVdiBlockMap=NULL;
	static uint32_t VdiBlockMapSize=0;
	// Vars needed for virtual write access
	static FILE *hCacheFile=NULL;
	static pTCacheFileHeader pCacheFileHeader=NULL;
	static pTCacheFileBlockIndex pCacheFileBlockIndex=NULL;
	// Semaphores to control concurrent read & write access
	static sem_t sem_img_read;
	static sem_t sem_vdiheader_read;
	static sem_t sem_info_read;
	static sem_t sem_cachefile_rw;

	/*
	* PrintUsage:
	* Print usage instructions (cmdline options etc..)
	*
	* Params:
	* pProgramName: Program name (argv[0])
	*
	* Returns:
	* n/a
	*/
	static void PrintUsage(char *pProgramName) {
	printf("\nUsage:\n");
	printf(" %s [[fopts] [mopts]] <ifile> [<ifile> [...]] <mntp>\n\n",pProgramName);
	printf("Options:\n");
	printf(" fopts:\n");
	printf(" -d : Enable FUSE's debug mode. (Enables also xmount's debug mode)\n");
	printf(" -s : Run single threaded.\n");
	printf(" mopts:\n");
	printf(" --rw <cache_file> : Enable virtual write support and set cache file to use.\n");
	printf(" --in <type> : Specify input image type. Type can be \"dd\"");
	#ifdef HAVE_LIBEWF
	printf(", \"ewf\"");
	#endif
	#ifdef HAVE_LIBAFF
	printf(", \"aff\"");
	#endif
	printf(".\n");
	printf(" --out <type> : Specify output image type. Type can be \"dd\" or \"vdi\".\n");
	printf(" Input and output image type defaults to \"dd\" if not specified.\n");
	printf(" ifile:\n");
	printf(" Input image file. If you use EWF files, you have to specify all image\n");
	printf(" segments!\n");
	printf(" mntp:\n");
	printf(" Mount point where virtual files should be located.\n");
	}

	/*
	* LogMessage:
	* Print error and debug messages to stdout
	*
	* Params:
	* pMessageType: "ERROR", "DEBUG" or "WARNING"
	* pCallingFunction: Name of calling function
	* line: Line number of call
	* pMessage: Message string
	* ...: Variable params with values to include in message string
	*
	* Returns:
	* n/a
	*/
	static void LogMessage(char *pMessageType,
	char *pCallingFunction,
	int line,
	char *pMessage,
	...)
	{
	va_list VaList;

	// Print message "header"
	printf("%s: %s.%u : ",pMessageType,pCallingFunction,line);
	// Print message with variable parameters
	va_start(VaList,pMessage);
	vprintf(pMessage,VaList);
	va_end(VaList);
	}

	/*
	* ExtractVirtFileNames:
	* Extract virtual file name from input image name
	*
	* Params:
	* pOrigName: Name of input image (Can include a path)
	*
	* Returns:
	* "TRUE" on success, "FALSE" on error
	*/
	static int ExtractVirtFileNames(char *pOrigName) {
	char *tmp;

	// Truncate any leading path
	tmp=strrchr(pOrigName,'/');
	if(tmp!=NULL) pOrigName=tmp+1;

	tmp=strrchr(pOrigName,'.');
	if(tmp==NULL) {
	// Input image filename has no extension
	// Alloc mem for leading '/', filename and extension (.dd or .vdi)
	XMountConfData.pVirtualImagePath=
	(char)malloc((strlen(pOrigName)+6)sizeof(char));
	XMountConfData.pVirtualImageInfoPath=
	(char)malloc((strlen(pOrigName)+7)sizeof(char));
	} else {
	// Extract base filename from input image filename
	// Alloc mem for leading '/', filename and extension (.dd or .vdi)
	XMountConfData.pVirtualImagePath=
	(char)malloc(((strlen(pOrigName)-strlen(tmp))+6)sizeof(char));
	XMountConfData.pVirtualImageInfoPath=
	(char)malloc(((strlen(pOrigName)-strlen(tmp))+7)sizeof(char));
	}
	if(XMountConfData.pVirtualImagePath==NULL \|\|
	XMountConfData.pVirtualImageInfoPath==NULL)
	{
	LOG_ERROR("Couldn't alloc memmory!\n")
	return FALSE;
	}
	// Set leading '/'
	(XMountConfData.pVirtualImagePath)[0]='/';
	(XMountConfData.pVirtualImageInfoPath)[0]='/';
	// Copy filename
	if(tmp==NULL) {
	strcpy(&(XMountConfData.pVirtualImagePath[1]),
	pOrigName);
	strcpy(&(XMountConfData.pVirtualImageInfoPath[1]),
	pOrigName);
	// Add file extensions
	switch(XMountConfData.VirtImageType) {
	case TVirtImageType_DD:
	strcpy(&(XMountConfData.pVirtualImagePath[strlen(pOrigName)+1]),
	".dd");
	break;
	case TVirtImageType_VDI:
	strcpy(&(XMountConfData.pVirtualImagePath[strlen(pOrigName)+1]),
	".vdi");
	break;
	default:
	LOG_ERROR("Unknown virtual image type!\n")
	return FALSE;
	}
	strcpy(&(XMountConfData.pVirtualImageInfoPath[strlen(pOrigName)+1]),
	".info");
	} else {
	strncpy(&(XMountConfData.pVirtualImagePath[1]),
	pOrigName,
	strlen(pOrigName)-strlen(tmp));
	strncpy(&(XMountConfData.pVirtualImageInfoPath[1]),
	pOrigName,
	strlen(pOrigName)-strlen(tmp));
	// Add file extensions
	switch(XMountConfData.VirtImageType) {
	case TVirtImageType_DD:
	strcpy(&(XMountConfData.pVirtualImagePath[(strlen(pOrigName)-strlen(tmp))+1]),
	".dd");
	break;
	case TVirtImageType_VDI:
	strcpy(&(XMountConfData.pVirtualImagePath[(strlen(pOrigName)-strlen(tmp))+1]),
	".vdi");
	break;
	default:
	LOG_ERROR("Unknown virtual image type!\n")
	return FALSE;
	}
	strcpy(&(XMountConfData.pVirtualImageInfoPath[(strlen(pOrigName)-strlen(tmp))+1]),
	".info");
	}
	LOG_DEBUG("Set virtual image name to \"%s\"\n",
	XMountConfData.pVirtualImagePath)
	LOG_DEBUG("Set virtual image info name to \"%s\"\n",
	XMountConfData.pVirtualImageInfoPath)
	return TRUE;
	}

	/*
	* GetOrigImageSize:
	* Get size of original image
	*
	* Params:
	* size: Pointer to an uint64_t to which the size will be written to
	*
	* Returns:
	* "TRUE" on success, "FALSE" on error
	*/
	static int GetOrigImageSize(uint64_t *size) {
	// Make sure to return correct values when dealing with only 32bit file sizes
	*size=0;

	// When size was already queryed, use old value rather than regetting value
	// from disk
	//if(XMountConfData.OrigImageSize!=0) return XMountConfData.OrigImageSize;

	// Now get size of original image
	switch(XMountConfData.OrigImageType) {
	case TOrigImageType_DD:
	// Original image is a DD file. Seek to end to get size.
	sem_wait(&sem_img_read);
	if(fseeko(hDdFile,0,SEEK_END)!=0) {
	LOG_ERROR("Couldn't seek to end of image file!\n")
	sem_post(&sem_img_read);
	return FALSE;
	}
	*size=ftello(hDdFile);
	sem_post(&sem_img_read);
	break;
	#ifdef HAVE_LIBEWF
	case TOrigImageType_EWF:
	// Original image is an EWF file. Just query media size.
	sem_wait(&sem_img_read);
	if(libewf_get_media_size(hEwfFile,size)!=1) {
	LOG_ERROR("Couldn't get ewf media size!\n")
	sem_post(&sem_img_read);
	return FALSE;
	}
	sem_post(&sem_img_read);
	break;
	#endif
	#ifdef HAVE_LIBAFF
	case TOrigImageType_AFF:
	// Original image is an AFF file.
	// TODO: Implement AFF image type handling
	LOG_ERROR("AFF image type handling not implemented!\n")
	return FALSE;
	break;
	#endif
	default:
	LOG_ERROR("Unsupported image type!\n")
	return FALSE;
	}
	// Save size so we have not to reget it from disk next time
	XMountConfData.OrigImageSize=*size;
	return TRUE;
	}

	/*
	* GetVirtImageSize:
	* Get size of the emulated image
	*
	* Params:
	* size: Pointer to an uint64_t to which the size will be written to
	*
	* Returns:
	* "TRUE" on success, "FALSE" on error
	*/
	static int GetVirtImageSize(uint64_t *size) {
	//if(XMountConfData.VirtImageSize!=0) return XMountConfData.VirtImageSize;

	switch(XMountConfData.VirtImageType) {
	case TVirtImageType_DD:
	// Virtual image is a DD file. Just return the size of the original image
	if(!GetOrigImageSize(size)) {
	LOG_ERROR("Couldn't get size of input image!\n")
	return FALSE;
	}
	break;
	case TVirtImageType_VDI:
	// Virtual image is a VDI file. Get size of original image and add size
	// of VDI header etc.
	if(!GetOrigImageSize(size)) {
	LOG_ERROR("Couldn't get size of input image!\n")
	return FALSE;
	}
	(*size)+=(sizeof(TVdiFileHeader)+VdiBlockMapSize);
	break;
	default:
	LOG_ERROR("Unsupported image type!\n")
	return FALSE;
	}
	XMountConfData.VirtImageSize=*size;
	return TRUE;
	}

	/*
	* GetOrigImageData:
	* Read data from original image
	*
	* Params:
	* buf: Pointer to buffer to write read data to (Must be preallocated!)
	* offset: Offset at which data should be read
	* size: Size of data which should be read (Size of buffer)
	*
	* Returns:
	* Number of read bytes on success or "-1" on error
	*/
	static int GetOrigImageData(char *buf, off_t offset, size_t size) {
	size_t ToRead=0;
	uint64_t ImageSize=0;

	// Make sure we aren't reading past EOF of image file
	if(!GetOrigImageSize(&ImageSize)) {
	LOG_ERROR("Couldn't get image size!\n")
	return -1;
	}
	if(offset>=ImageSize) {
	// Offset is beyond image size
	LOG_DEBUG("Offset is beyond image size.\n")
	return 0;
	}
	if(offset+size>ImageSize) {
	// Attempt to read data past EOF of image file
	ToRead=ImageSize-offset;
	LOG_DEBUG("Attempt to read data past EOF. Corrected size from %zd"
	" to %zd.\n",size,ToRead)
	} else ToRead=size;

	// Now read data from image file
	switch(XMountConfData.OrigImageType) {
	case TOrigImageType_DD:
	// Original image is a DD file. Seek to offset and read ToRead bytes.
	sem_wait(&sem_img_read);
	if(fseeko(hDdFile,offset,SEEK_SET)!=0) {
	LOG_ERROR("Couldn't seek to offset %" PRIu64 "!\n",offset)
	sem_post(&sem_img_read);
	return -1;
	}
	if(fread(buf,ToRead,1,hDdFile)!=1) {
	LOG_ERROR("Couldn't read %zd bytes from offset %" PRIu64
	"!\n",ToRead,offset)
	sem_post(&sem_img_read);
	return -1;
	}
	sem_post(&sem_img_read);
	LOG_DEBUG("Read %zd bytes at offset %" PRIu64 " from DD file\n",
	ToRead,offset)
	break;
	#ifdef HAVE_LIBEWF
	case TOrigImageType_EWF:
	// Original image is an EWF file. Seek to offset and read ToRead bytes.
	sem_wait(&sem_img_read);
	if(libewf_seek_offset(hEwfFile,offset)!=-1) {
	if(libewf_read_buffer(hEwfFile,buf,ToRead)!=ToRead) {
	LOG_ERROR("Couldn't read %zd bytes from offset %" PRIu64
	"!\n",ToRead,offset)
	sem_post(&sem_img_read);
	return -1;
	}
	} else {
	LOG_ERROR("Couldn't seek to offset %" PRIu64 "!\n",offset)
	sem_post(&sem_img_read);
	return -1;
	}
	sem_post(&sem_img_read);
	LOG_DEBUG("Read %zd bytes at offset %" PRIu64 " from EWF file\n",
	ToRead,offset)
	break;
	#endif
	#ifdef HAVE_LIBAFF
	case TOrigImageType_AFF:
	// Original image is an AFF file.
	// TODO: Implement AFF image type handling
	LOG_ERROR("AFF image type handling not implemented!\n")
	return -1;
	break;
	#endif
	default:
	LOG_ERROR("Unsupported image type!\n")
	return -1;
	}
	return ToRead;
	}

	/*
	* IsVdiFileHeaderCached:
	* Determine if VDI file header is cached
	*
	* Params:
	* n/a
	*
	* Returns:
	* "TRUE" if cached, "FALSE" if uncached
	*/
	static int IsVdiFileHeaderCached() {
	sem_wait(&sem_cachefile_rw);
	if(pCacheFileHeader->VdiFileHeaderCached==1) {
	sem_post(&sem_cachefile_rw);
	return TRUE;
	} else {
	sem_post(&sem_cachefile_rw);
	return FALSE;
	}
	}

	/*
	* IsBlockCached:
	* Determine if a given block is cached
	*
	* Params:
	* block: Cache block number
	*
	* Returns:
	* "TRUE" if cached, "FALSE" if uncached
	*/
	static int IsBlockCached(uint32_t block) {
	sem_wait(&sem_cachefile_rw);
	if(pCacheFileBlockIndex[block].Assigned==1) {
	sem_post(&sem_cachefile_rw);
	return TRUE;
	} else {
	sem_post(&sem_cachefile_rw);
	return FALSE;
	}
	}

	/*
	* GetVirtImageData:
	* Read data from virtual image
	*
	* Params:
	* buf: Pointer to buffer to write read data to (Must be preallocated!)
	* offset: Offset at which data should be read
	* size: Size of data which should be read (Size of buffer)
	*
	* Returns:
	* Number of read bytes on success or "-1" on error
	*/
	static int GetVirtImageData(char *buf, off_t offset, size_t size) {
	uint32_t CurBlock=0;
	uint64_t VirtImageSize;
	size_t ToRead=0;
	size_t CurToRead=0;
	int64_t ret=0;
	off_t FileOff=offset;
	off_t BlockOff=0;

	// Get virtual image size
	if(!GetVirtImageSize(&VirtImageSize)) {
	LOG_ERROR("Couldn't get virtual image size!\n")
	return -1;
	}

	if(offset>=VirtImageSize) {
	LOG_ERROR("Attempt to read beyond virtual image EOF!\n")
	return -1;
	}

	if(offset+size>VirtImageSize) {
	LOG_DEBUG("Attempt to read pas EOF of virtual image file\n")
	size=VirtImageSize-offset;
	}

	ToRead=size;

	// Read virtual image type specific data
	switch(XMountConfData.VirtImageType) {
	case TVirtImageType_VDI:
	if(FileOff<VdiFileHeaderSize) {
	if(FileOff+ToRead>VdiFileHeaderSize) CurToRead=VdiFileHeaderSize-FileOff;
	else CurToRead=ToRead;
	if(XMountConfData.Writable==TRUE && IsVdiFileHeaderCached()==TRUE) {
	// VDI header was already cached
	sem_wait(&sem_cachefile_rw);
	if(fseeko(hCacheFile,
	pCacheFileHeader->pVdiFileHeader+FileOff,
	SEEK_SET)!=0)
	{
	LOG_ERROR("Couldn't seek to cached VDI header at offset %"
	PRIu64 "\n",pCacheFileHeader->pVdiFileHeader+FileOff)
	sem_post(&sem_cachefile_rw);
	return 0;
	}
	if(fread(buf,CurToRead,1,hCacheFile)!=1) {
	LOG_ERROR("Couldn't read %zu bytes from cache file at offset %"
	PRIu64 "\n",CurToRead,
	pCacheFileHeader->pVdiFileHeader+FileOff)
	sem_post(&sem_cachefile_rw);
	return 0;
	}
	sem_post(&sem_cachefile_rw);
	LOG_DEBUG("Read %zd bytes from cached VDI header at offset %"
	PRIu64 " at cache file offset %" PRIu64 "\n",
	CurToRead,FileOff,
	pCacheFileHeader->pVdiFileHeader+FileOff)
	} else {
	// VDI header isn't cached
	sem_wait(&sem_vdiheader_read);
	memcpy(buf,((char*)pVdiFileHeader)+FileOff,CurToRead);
	sem_post(&sem_vdiheader_read);
	LOG_DEBUG("Read %zd bytes at offset %" PRIu64
	" from virtual VDI header\n",CurToRead,
	FileOff)
	}
	if(ToRead==CurToRead) return ToRead;
	else {
	// Adjust values to read from original image
	ToRead-=CurToRead;
	buf+=CurToRead;
	FileOff=0;
	}
	} else FileOff-=VdiFileHeaderSize;
	break;
	}

	// Calculate block to read data from
	CurBlock=FileOff/CACHE_BLOCK_SIZE;
	BlockOff=FileOff%CACHE_BLOCK_SIZE;

	// Read image data
	while(ToRead!=0) {
	// Calculate how many bytes we have to read from this block
	if(BlockOff+ToRead>CACHE_BLOCK_SIZE) {
	CurToRead=CACHE_BLOCK_SIZE-BlockOff;
	} else CurToRead=ToRead;
	if(XMountConfData.Writable==TRUE && IsBlockCached(CurBlock)==TRUE) {
	// Write support enabled and need to read altered data from cachefile
	sem_wait(&sem_cachefile_rw);
	if(fseeko(hCacheFile,
	pCacheFileBlockIndex[CurBlock].off_data+BlockOff,
	SEEK_SET)!=0)
	{
	LOG_ERROR("Couldn't seek to offset %" PRIu64
	" in cache file\n")
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	if(fread(buf,CurToRead,1,hCacheFile)!=1) {
	LOG_ERROR("Couldn't read data from cache file!\n")
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	sem_post(&sem_cachefile_rw);
	LOG_DEBUG("Read %zd bytes at offset %" PRIu64
	" from cache file\n",CurToRead,FileOff)
	} else {
	// No write support or data not cached
	if(GetOrigImageData(buf,
	FileOff,
	CurToRead)!=CurToRead)
	{
	LOG_ERROR("Couldn't read data from input image!\n")
	return -1;
	}
	LOG_DEBUG("Read %zd bytes at offset %" PRIu64
	" from original image file\n",CurToRead,
	FileOff)
	}
	CurBlock++;
	BlockOff=0;
	buf+=CurToRead;
	ToRead-=CurToRead;
	FileOff+=CurToRead;
	}
	return size;
	}

	/*
	* SetVdiFileHeaderData:
	* Write data to virtual VDI file header
	*
	* Params:
	* buf: Buffer containing data to write
	* offset: Offset of changes
	* size: Amount of bytes to write
	*
	* Returns:
	* Number of written bytes on success or "-1" on error
	*/
	static int SetVdiFileHeaderData(char *buf,off_t offset,size_t size) {
	if(offset+size>VdiFileHeaderSize) size=VdiFileHeaderSize-offset;
	LOG_DEBUG("Need to cache %zu bytes at offset %" PRIu64
	" from VDI header\n",size,offset)
	sem_wait(&sem_cachefile_rw);
	sem_wait(&sem_vdiheader_read);
	if(pCacheFileHeader->VdiFileHeaderCached==1) {
	// Header was already cached
	if(fseeko(hCacheFile,
	pCacheFileHeader->pVdiFileHeader+offset,
	SEEK_SET)!=0)
	{
	LOG_ERROR("Couldn't seek to cached VDI header at address %"
	PRIu64 "\n",pCacheFileHeader->pVdiFileHeader+offset)
	sem_post(&sem_vdiheader_read);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	if(fwrite(buf,size,1,hCacheFile)!=1) {
	LOG_ERROR("Couldn't write %zu bytes to cache file at offset %"
	PRIu64 "\n",size,
	pCacheFileHeader->pVdiFileHeader+offset)
	sem_post(&sem_vdiheader_read);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	LOG_DEBUG("Wrote %zd bytes at offset %" PRIu64 " to cache file\n",
	size,pCacheFileHeader->pVdiFileHeader+offset)
	} else {
	// Header wasn't already cached.
	if(fseeko(hCacheFile,
	0,
	SEEK_END)!=0)
	{
	LOG_ERROR("Couldn't seek to end of cache file!")
	sem_post(&sem_vdiheader_read);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	pCacheFileHeader->pVdiFileHeader=ftello(hCacheFile);
	LOG_DEBUG("Caching whole VDI header\n")
	if(offset>0) {
	// Changes do not begin at offset 0, need to prepend with data from
	// VDI header
	if(fwrite((char*)pVdiFileHeader,offset,1,hCacheFile)!=1) {
	LOG_ERROR("Error while writing %" PRIu64 " bytes "
	"to cache file at offset %" PRIu64 "!\n",
	offset,
	pCacheFileHeader->pVdiFileHeader);
	sem_post(&sem_vdiheader_read);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	LOG_DEBUG("Prepended changed data with %" PRIu64
	" bytes at cache file offset %" PRIu64 "\n",
	offset,pCacheFileHeader->pVdiFileHeader)
	}
	// Cache changed data
	if(fwrite(buf,size,1,hCacheFile)!=1) {
	LOG_ERROR("Couldn't write %zu bytes to cache file at offset %"
	PRIu64 "\n",size,
	pCacheFileHeader->pVdiFileHeader+offset)
	sem_post(&sem_vdiheader_read);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	LOG_DEBUG("Wrote %zu bytes of changed data to cache file offset %"
	PRIu64 "\n",size,
	pCacheFileHeader->pVdiFileHeader+offset)
	if(offset+size!=VdiFileHeaderSize) {
	// Need to append data from VDI header to cache whole data struct
	if(fwrite(((char*)pVdiFileHeader)+offset+size,
	VdiFileHeaderSize-(offset+size),
	1,
	hCacheFile)!=1)
	{
	LOG_ERROR("Couldn't write %zu bytes to cache file at offset %"
	PRIu64 "\n",VdiFileHeaderSize-(offset+size),
	(uint64_t)(pCacheFileHeader->pVdiFileHeader+offset+size))
	sem_post(&sem_vdiheader_read);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	LOG_DEBUG("Appended %" PRIu32
	" bytes to changed data at cache file offset %"
	PRIu64 "\n",VdiFileHeaderSize-(offset+size),
	pCacheFileHeader->pVdiFileHeader+offset+size)
	}
	// Mark header as cached and update header in cache file
	pCacheFileHeader->VdiFileHeaderCached=1;
	if(fseeko(hCacheFile,0,SEEK_SET)!=0) {
	LOG_ERROR("Couldn't seek to offset 0 of cache file!\n")
	sem_post(&sem_vdiheader_read);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	if(fwrite((char*)pCacheFileHeader,sizeof(TCacheFileHeader),1,hCacheFile)!=1) {
	LOG_ERROR("Couldn't write changed cache file header!\n")
	sem_post(&sem_vdiheader_read);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	}
	// All important data has been written, now flush all buffers to make
	// sure data is written to cache file
	fflush(hCacheFile);
	ioctl(fileno(hCacheFile),BLKFLSBUF,0);
	sem_post(&sem_vdiheader_read);
	sem_post(&sem_cachefile_rw);
	return size;
	}

	/*
	* SetVirtImageData:
	* Write data to virtual image
	*
	* Params:
	* buf: Buffer containing data to write
	* offset: Offset to start writing at
	* size: Size of data to be written
	*
	* Returns:
	* Number of written bytes on success or "-1" on error
	*/
	static int SetVirtImageData(const char *buf, off_t offset, size_t size) {
	uint64_t CurBlock=0;
	uint64_t VirtImageSize;
	uint64_t OrigImageSize;
	size_t ToWrite=0;
	size_t CurToWrite=0;
	off_t FileOff=offset;
	off_t BlockOff=0;
	char WriteBuf=(char)buf;
	char *buf2;
	ssize_t ret;

	// Get virtual image size
	if(!GetVirtImageSize(&VirtImageSize)) {
	LOG_ERROR("Couldn't get virtual image size!\n")
	return -1;
	}

	if(offset>=VirtImageSize) {
	LOG_ERROR("Attempt to write beyond EOF of virtual image file!\n")
	return -1;
	}

	if(offset+size>VirtImageSize) {
	LOG_DEBUG("Attempt to write past EOF of virtual image file\n")
	size=VirtImageSize-offset;
	}

	ToWrite=size;

	// Cache virtual image type specific data
	if(XMountConfData.VirtImageType==TVirtImageType_VDI) {
	if(FileOff<VdiFileHeaderSize) {
	ret=SetVdiFileHeaderData(WriteBuf,FileOff,ToWrite);
	if(ret==-1) {
	LOG_ERROR("Couldn't write data to virtual VDI file header!\n")
	return -1;
	}
	if(ret==ToWrite) return ToWrite;
	else {
	ToWrite-=ret;
	WriteBuf+=ret;
	FileOff=0;
	}
	} else FileOff-=VdiFileHeaderSize;
	}

	// Get original image size
	if(!GetOrigImageSize(&OrigImageSize)) {
	LOG_ERROR("Couldn't get original image size!\n")
	return -1;
	}

	// Calculate block to write data to
	CurBlock=FileOff/CACHE_BLOCK_SIZE;
	BlockOff=FileOff%CACHE_BLOCK_SIZE;

	while(ToWrite!=0) {
	// Calculate how many bytes we have to write to this block
	if(BlockOff+ToWrite>CACHE_BLOCK_SIZE) {
	CurToWrite=CACHE_BLOCK_SIZE-BlockOff;
	} else CurToWrite=ToWrite;
	if(IsBlockCached(CurBlock)==TRUE) {
	// Block was already cached
	sem_wait(&sem_cachefile_rw);
	// Seek to data offset in cache file
	if(fseeko(hCacheFile,
	pCacheFileBlockIndex[CurBlock].off_data+BlockOff,
	SEEK_SET)!=0)
	{
	LOG_ERROR("Couldn't seek to cached block at address %" PRIu64 "\n",
	pCacheFileBlockIndex[CurBlock].off_data+BlockOff)
	return -1;
	}
	if(fwrite(WriteBuf,CurToWrite,1,hCacheFile)!=1) {
	LOG_ERROR("Error while writing %zu bytes "
	"to cache file at offset %" PRIu64 "!\n",
	CurToWrite,
	pCacheFileBlockIndex[CurBlock].off_data+BlockOff);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	sem_post(&sem_cachefile_rw);
	LOG_DEBUG("Wrote %zd bytes at offset %" PRIu64
	" to cache file\n",CurToWrite,
	pCacheFileBlockIndex[CurBlock].off_data+BlockOff)
	} else {
	// Uncached block. Need to cache entire new block
	// Seek to end of cache file to append new cache block
	sem_wait(&sem_cachefile_rw);
	fseeko(hCacheFile,0,SEEK_END);
	pCacheFileBlockIndex[CurBlock].off_data=ftello(hCacheFile);
	if(BlockOff!=0) {
	// Changed data does not begin at block boundry. Need to prepend
	// with data from virtual image file
	buf2=(char)malloc(BlockOffsizeof(char));
	if(buf2==NULL) {
	LOG_ERROR("Couldn't allocate memmory!\n")
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	if(GetOrigImageData(buf2,FileOff-BlockOff,BlockOff)!=BlockOff) {
	LOG_ERROR("Couldn't read data from original image file!\n")
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	if(fwrite(buf2,BlockOff,1,hCacheFile)!=1) {
	LOG_ERROR("Couldn't writing %" PRIu64 " bytes "
	"to cache file at offset %" PRIu64 "!\n",
	BlockOff,
	pCacheFileBlockIndex[CurBlock].off_data);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	LOG_DEBUG("Prepended changed data with %" PRIu64
	" bytes from virtual image file at offset %" PRIu64
	"\n",BlockOff,FileOff-BlockOff)
	free(buf2);
	}
	if(fwrite(WriteBuf,CurToWrite,1,hCacheFile)!=1) {
	LOG_ERROR("Error while writing %zd bytes "
	"to cache file at offset %" PRIu64 "!\n",
	CurToWrite,
	pCacheFileBlockIndex[CurBlock].off_data+BlockOff);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	if(BlockOff+CurToWrite!=CACHE_BLOCK_SIZE) {
	// Changed data does not end at block boundry. Need to append
	// with data from virtual image file
	buf2=(char*)malloc((CACHE_BLOCK_SIZE-
	(BlockOff+CurToWrite))*sizeof(char));
	memset(buf2,0,CACHE_BLOCK_SIZE-(BlockOff+CurToWrite));
	if(buf2==NULL) {
	LOG_ERROR("Couldn't allocate memmory!\n")
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	if((FileOff-BlockOff)+CACHE_BLOCK_SIZE>OrigImageSize) {
	// Original image is smaller than full cache block
	if(GetOrigImageData(buf2,
	FileOff+CurToWrite,
	OrigImageSize-(FileOff+CurToWrite))!=
	OrigImageSize-(FileOff+CurToWrite))
	{
	LOG_ERROR("Couldn't read data from virtual image file!\n")
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	} else {
	if(GetOrigImageData(buf2,
	FileOff+CurToWrite,
	CACHE_BLOCK_SIZE-(BlockOff+CurToWrite))!=
	CACHE_BLOCK_SIZE-(BlockOff+CurToWrite))
	{
	LOG_ERROR("Couldn't read data from virtual image file!\n")
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	}
	if(fwrite(buf2,
	CACHE_BLOCK_SIZE-(BlockOff+CurToWrite),
	1,
	hCacheFile)!=1)
	{
	LOG_ERROR("Error while writing %zd bytes "
	"to cache file at offset %" PRIu64 "!\n",
	CACHE_BLOCK_SIZE-(BlockOff+CurToWrite),
	pCacheFileBlockIndex[CurBlock].off_data+BlockOff+CurToWrite);
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	free(buf2);
	}
	// All important data for this cache block has been written,
	// flush all buffers and mark cache block as assigned
	fflush(hCacheFile);
	ioctl(fileno(hCacheFile),BLKFLSBUF,0);
	pCacheFileBlockIndex[CurBlock].Assigned=1;
	// Update cache block index entry in cache file
	fseeko(hCacheFile,
	sizeof(TCacheFileHeader)+(CurBlock*sizeof(TCacheFileBlockIndex)),
	SEEK_SET);
	if(fwrite(&(pCacheFileBlockIndex[CurBlock]),
	sizeof(TCacheFileBlockIndex),
	1,
	hCacheFile)!=1)
	{
	LOG_ERROR("Couldn't update cache file block index!\n");
	sem_post(&sem_cachefile_rw);
	return -1;
	}
	LOG_DEBUG("Updated cache file block index: Number=%" PRIu64
	", Data offset=%" PRIu64 "\n",CurBlock,
	pCacheFileBlockIndex[CurBlock].off_data);
	}
	// Flush buffers
	fflush(hCacheFile);
	ioctl(fileno(hCacheFile),BLKFLSBUF,0);
	sem_post(&sem_cachefile_rw);
	BlockOff=0;
	CurBlock++;
	WriteBuf+=CurToWrite;
	ToWrite-=CurToWrite;
	FileOff+=CurToWrite;
	}
	return size;
	}

	/*
	* GetVirtFileAttr:
	* FUSE getattr implementation
	*
	* Params:
	* path: Path of file to get attributes from
	* stbuf: Pointer to stat structure to save attributes to
	*
	* Returns:
	* "0" on success, negated error code on error
	*/
	static int GetVirtFileAttr(const char path, struct stat stbuf) {
	memset(stbuf,0,sizeof(struct stat));
	if(strcmp(path,"/")==0) {
	// Attributes of mountpoint
	stbuf->st_mode=S_IFDIR \| 0777;
	stbuf->st_nlink=2;
	} else if(strcmp(path,XMountConfData.pVirtualImagePath)==0) {
	// Attributes of virtual image
	if(!XMountConfData.Writable) stbuf->st_mode=S_IFREG \| 0444;
	else stbuf->st_mode=S_IFREG \| 0666;
	stbuf->st_nlink=1;
	// Get virtual image file size
	if(!GetVirtImageSize(&(stbuf->st_size))) {
	LOG_ERROR("Couldn't get image size!\n");
	return -ENOENT;
	}
	} else if(strcmp(path,XMountConfData.pVirtualImageInfoPath)==0) {
	// Attributes of virtual image info file
	stbuf->st_mode=S_IFREG \| 0444;
	stbuf->st_nlink=1;
	// Get virtual image info file size
	sem_wait(&sem_info_read);
	if(pVirtualImageInfoFile!=NULL) {
	stbuf->st_size=strlen(pVirtualImageInfoFile);
	} else stbuf->st_size=0;
	sem_post(&sem_info_read);
	} else return -ENOENT;
	return 0;
	}

	/*
	* GetVirtFiles:
	* FUSE readdir implementation
	*
	* Params:
	* path: Path from where files should be listed
	* buf: Buffer to write file entrys to
	* filler: Function to write file entrys to buffer
	* offset: ??? but not used
	* fi: ??? but not used
	*
	* Returns:
	* "0" on success, negated error code on error
	*/
	static int GetVirtFiles(const char *path,
	void *buf,
	fuse_fill_dir_t filler,
	off_t offset,
	struct fuse_file_info *fi)
	{
	(void)offset;
	(void)fi;

	// We have only files in root
	if(strcmp(path,"/")!=0) return -ENOENT;
	// Add std . and .. entrys
	filler(buf,".",NULL,0);
	filler(buf, "..",NULL,0);
	// Add our virtual files (p+1 to ignore starting "/")
	filler(buf,XMountConfData.pVirtualImagePath+1,NULL,0);
	filler(buf,XMountConfData.pVirtualImageInfoPath+1,NULL,0);
	return 0;
	}

	/*
	* OpenVirtFile:
	* FUSE open implementation
	*
	* Params:
	* path: Path to file to open
	* fi: ??? but not used
	*
	* Returns:
	* "0" on success, negated error code on error
	*/
	static int OpenVirtFile(const char path, struct fuse_file_info fi) {
	if(strcmp(path,XMountConfData.pVirtualImagePath)!=0 &&
	strcmp(path,XMountConfData.pVirtualImageInfoPath)!=0)
	{
	// Attempt to open a non existant file
	LOG_DEBUG("Attempt to open non existant file \"%s\".\n",path)
	return -ENOENT;
	}
	// Check open permissions
	if(!XMountConfData.Writable && (fi->flags & 3)!=O_RDONLY) {
	// Attempt to open a read-only file for writing
	LOG_DEBUG("Attempt to open the read-only file \"%s\" for writing.\n",path)
	return -EACCES;
	}
	return 0;
	}

	/*
	* ReadVirtFile:
	* FUSE read implementation
	*
	* Params:
	* buf: Buffer where read data is written to
	* size: Number of bytes to read
	* offset: Offset to start reading at
	* fi: ?? but not used
	*
	* Returns:
	* Read bytes on success, negated error code on error
	*/
	static int ReadVirtFile(const char *path,
	char *buf,
	size_t size,
	off_t offset,
	struct fuse_file_info *fi)
	{
	uint64_t len;

	if(strcmp(path,XMountConfData.pVirtualImagePath)==0) {
	// Get virtual image file size
	if(!GetVirtImageSize(&len)) {
	LOG_ERROR("Couldn't get virtual image size!\n")
	return 0;
	}
	if(offset<len) {
	if(offset+size>len) size=len-offset;
	if(GetVirtImageData(buf,offset,size)!=size) {
	LOG_ERROR("Couldn't read data from virtual image file!\n")
	return 0;
	}
	} else {
	LOG_DEBUG("Attempt to read past EOF of virtual image file\n");
	return 0;
	}
	} else if(strcmp(path,XMountConfData.pVirtualImageInfoPath)==0) {
	// Read data from virtual image info file
	len=strlen(pVirtualImageInfoFile);
	if(offset<len) {
	if(offset+size>len) {
	size=len-offset;
	LOG_DEBUG("Attempt ro read past EOF of virtual image info file")
	}
	sem_wait(&sem_info_read);
	memcpy(buf,pVirtualImageInfoFile+offset,size);
	sem_post(&sem_info_read);
	LOG_DEBUG("Read %" PRIu64 " bytes at offset %" PRIu64
	" from virtual image info file\n",size,offset)
	} else {
	LOG_DEBUG("Attempt to read past EOF of virtual info file\n");
	return 0;
	}
	} else {
	// Attempt to read non existant file
	LOG_DEBUG("Attempt to read from non existant file \"%s\"\n",path)
	return -ENOENT;
	}

	return size;
	}

	/*
	* WriteVirtFile:
	* FUSE write implementation
	*
	* Params:
	* buf: Buffer containing data to write
	* size: Number of bytes to write
	* offset: Offset to start writing at
	* fi: ?? but not used
	*
	* Returns:
	* Written bytes on success, negated error code on error
	*/
	static int WriteVirtFile(const char *path,
	const char *buf,
	size_t size,
	off_t offset,
	struct fuse_file_info *fi)
	{
	uint64_t len;

	if(strcmp(path,XMountConfData.pVirtualImagePath)==0) {
	// Get virtual image file size
	if(!GetVirtImageSize(&len)) {
	LOG_ERROR("Couldn't get virtual image size!\n")
	return 0;
	}
	if(offset<len) {
	if(offset+size>len) size=len-offset;
	if(SetVirtImageData(buf,offset,size)!=size) {
	LOG_ERROR("Couldn't write data to virtual image file!\n")
	return 0;
	}
	} else {
	LOG_DEBUG("Attempt to write past EOF of virtual image file\n");
	return 0;
	}
	} else if(strcmp(path,XMountConfData.pVirtualImageInfoPath)==0) {
	// Attempt to write data to read only image info file
	LOG_DEBUG("Attempt to write data to virtual info file\n");
	return -ENOENT;
	} else {
	// Attempt to write to non existant file
	LOG_DEBUG("Attempt to write to the non existant file \"%s\"\n",path)
	return -ENOENT;
	}

	return size;
	}

	//static int mountewf_release(const char *path,
	// fuse_file_info *finfo)
	//{
	// return 0;
	//}

	/*
	* InitVirtVdiHeader:
	* Build and init virtual VDI file header
	*
	* Params:
	* n/a
	*
	* Returns:
	* "TRUE" on success, "FALSE" on error
	*/
	static int InitVirtVdiHeader() {
	// See http://forums.virtualbox.org/viewtopic.php?t=8046 for a
	// "description" of the various header fields

	uint64_t ImageSize;
	off_t offset;
	uint32_t i,BlockEntries;

	// Get input image size
	if(!GetOrigImageSize(&ImageSize)) {
	LOG_ERROR("Couldn't get input image size!\n")
	return FALSE;
	}

	// Calculate how many VDI blocks we need
	BlockEntries=ImageSize/VDI_IMAGE_BLOCK_SIZE;
	if((ImageSize%VDI_IMAGE_BLOCK_SIZE)!=0) BlockEntries++;
	VdiBlockMapSize=BlockEntries*sizeof(uint32_t);
	LOG_DEBUG("BlockMap: %d (%08X) entries, %d (%08X) bytes!\n",
	BlockEntries,
	BlockEntries,
	VdiBlockMapSize,
	VdiBlockMapSize)

	// Allocate memmory for vdi header and block map
	VdiFileHeaderSize=sizeof(TVdiFileHeader)+VdiBlockMapSize;
	if((pVdiFileHeader=malloc(VdiFileHeaderSize))==NULL) {
	LOG_ERROR("Couldn't allocate memmory for TVdiFileHeader!\n");
	return FALSE;
	}
	memset(pVdiFileHeader,0,VdiFileHeaderSize);
	pVdiBlockMap=((void*)pVdiFileHeader)+sizeof(TVdiFileHeader);

	// Init header values
	strncpy(pVdiFileHeader->szFileInfo,VDI_FILE_COMMENT,
	strlen(VDI_FILE_COMMENT)+1);
	pVdiFileHeader->u32Signature=VDI_IMAGE_SIGNATURE;
	pVdiFileHeader->u32Version=VDI_IMAGE_VERSION;
	pVdiFileHeader->cbHeader=0x00000180; // No idea what this is for! Testimage had same value
	pVdiFileHeader->u32Type=VDI_IMAGE_TYPE_FIXED;
	pVdiFileHeader->fFlags=VDI_IMAGE_FLAGS;
	strncpy(pVdiFileHeader->szComment,VDI_HEADER_COMMENT,
	strlen(VDI_HEADER_COMMENT)+1);
	pVdiFileHeader->offData=VdiFileHeaderSize;
	pVdiFileHeader->offBlocks=sizeof(TVdiFileHeader);
	pVdiFileHeader->cCylinders=0; // Legacy info
	pVdiFileHeader->cHeads=0; // Legacy info
	pVdiFileHeader->cSectors=0; // Legacy info
	pVdiFileHeader->cbSector=512; // Legacy info
	pVdiFileHeader->u32Dummy=0;
	pVdiFileHeader->cbDisk=ImageSize;
	// Seems that VBox is always using 1MB as blocksize
	pVdiFileHeader->cbBlock=VDI_IMAGE_BLOCK_SIZE;
	pVdiFileHeader->cbBlockExtra=0;
	pVdiFileHeader->cBlocks=BlockEntries;
	pVdiFileHeader->cBlocksAllocated=BlockEntries;
	// Just generate some random UUIDS
	// VBox won't accept immages where create and modify UUIDS aren't set
	((uint32_t)(&(pVdiFileHeader->uuidCreate_l)))=rand();
	((uint32_t)(&(pVdiFileHeader->uuidCreate_l))+4)=rand();
	((uint32_t)(&(pVdiFileHeader->uuidCreate_h)))=rand();
	((uint32_t)(&(pVdiFileHeader->uuidCreate_h))+4)=rand();
	((uint32_t)(&(pVdiFileHeader->uuidModify_l)))=rand();
	((uint32_t)(&(pVdiFileHeader->uuidModify_l))+4)=rand();
	((uint32_t)(&(pVdiFileHeader->uuidModify_h)))=rand();
	((uint32_t)(&(pVdiFileHeader->uuidModify_h))+4)=rand();

	// Generate block map
	i=0;
	for(offset=0;offset<VdiBlockMapSize;offset+=4) {
	((uint32_t)(pVdiBlockMap+offset))=i;
	i++;
	}

	LOG_DEBUG("VDI header size = %u\n",VdiFileHeaderSize)

	return TRUE;
	}

	/*
	* InitVirtualVmdkFile:
	* Init the virtual VMDK file
	*
	* Params:
	* n/a
	*
	* Returns:
	* "TRUE" on success, "FALSE" on error
	*/
	static int InitVirtualVmdkFile() {
	uint64_t ImageSize;

	// Get original image size
	if(!GetOrigImageSize(&ImageSize)) {
	LOG_ERROR("Couldn't get original image size!\n")
	return FALSE;
	}


	}

	/*
	* ParseCmdLine:
	* Parse command line options
	*
	* Params:
	* argc: Number of cmdline params
	* argv: Array containing cmdline params
	* pNargv: Number of FUSE options is written to this var
	* pppNargv: FUSE options are written to this array
	* pFilenameCount: Number of input image files is written to this var
	* pppFilenames: Input image filenames are written to this array
	* ppMountpoint: Mountpoint is written to this var
	*
	* Returns:
	* "TRUE" on success, "FALSE" on error
	*/
	static int ParseCmdLine(const int argc,
	char **argv,
	int *pNargc,
	char ***pppNargv,
	int *pFilenameCount,
	char ***pppFilenames,
	char **ppMountpoint) {
	int i=1;
	int files=0,opts=0;

	// add argv[0] to pppNargv
	opts++;
	(pppNargv)=(char)malloc(optssizeof(char*));
	if((*pppNargv)==NULL) {
	LOG_ERROR("Couldn't allocate memmory!\n")
	return FALSE;
	}
	(pppNargv)[opts-1]=(char)malloc((strlen(argv[0])+1)*sizeof(char));
	if((*pppNargv)[opts-1]==NULL) {
	LOG_ERROR("Couldn't allocate memmory!\n")
	return FALSE;
	}
	strncpy((*pppNargv)[opts-1],argv[0],strlen(argv[0])+1);

	// Parse options
	while(i<argc && *argv[i]=='-') {
	if(strlen(argv[i])>1 && *(argv[i]+1)!='-') {
	opts++;
	(pppNargv)=(char)realloc((pppNargv),optssizeof(char));
	if((*pppNargv)==NULL) {
	LOG_ERROR("Couldn't allocate memmory for fuse options!\n")
	return FALSE;
	}
	(pppNargv)[opts-1]=(char)malloc((strlen(argv[i])+1)*sizeof(char));
	if((*pppNargv)[opts-1]==NULL) {
	LOG_ERROR("Couldn't allocate memmory for fuse options!\n")
	return FALSE;
	}
	strncpy((*pppNargv)[opts-1],argv[i],strlen(argv[i])+1);
	// React too on fuse's debug flag (-d)
	if(strcmp(argv[i],"-d")==0) XMountConfData.Debug=TRUE;
	} else {
	// Options beginning with -- are mountewf specific
	if(strcmp(argv[i],"--rw")==0) {
	// Emulate writable access to mounted image
	// Next parameter must be cache file to read/write changes from/to
	if((argc+1)>i) {
	i++;
	XMountConfData.pCacheFile=(char)malloc((strlen(argv[i])+1)sizeof(char));
	if(XMountConfData.pCacheFile==NULL) {
	LOG_ERROR("Couldn't alloc memmory!\n")
	return FALSE;
	}
	strncpy(XMountConfData.pCacheFile,argv[i],strlen(argv[i])+1);
	XMountConfData.Writable=TRUE;
	} else {
	LOG_ERROR("You must specify a cache file to read/write data from/to!\n")
	return FALSE;
	}
	LOG_DEBUG("Enabling virtual write support using cache file \"%s\"\n",
	XMountConfData.pCacheFile)
	} else if(strcmp(argv[i],"--in")==0) {
	// Specify input image type
	// Next parameter must be image type
	if((argc+1)>i) {
	i++;
	if(strcmp(argv[i],"dd")==0) {
	XMountConfData.OrigImageType=TOrigImageType_DD;
	LOG_DEBUG("Setting input image type to DD\n")
	#ifdef HAVE_LIBEWF
	} else if(strcmp(argv[i],"ewf")==0) {
	XMountConfData.OrigImageType=TOrigImageType_EWF;
	LOG_DEBUG("Setting input image type to EWF\n")
	#endif
	#ifdef HAVE_LIBAFF
	} else if(strcmp(argv[i],"aff")==0) {
	XMountConfData.OrigImageType=TOrigImageType_AFF;
	LOG_DEBUG("Setting input image type to AFF\n")
	#endif
	} else {
	LOG_ERROR("Unknown input image type \"%s\"!\n",argv[i])
	return FALSE;
	}
	} else {
	LOG_ERROR("You must specify an input image type!\n");
	return FALSE;
	}
	} else if(strcmp(argv[i],"--out")==0) {
	// Specify output image type
	// Next parameter must be image type
	if((argc+1)>i) {
	i++;
	if(strcmp(argv[i],"dd")==0) {
	XMountConfData.VirtImageType=TVirtImageType_DD;
	LOG_DEBUG("Setting virtual image type to DD\n")
	} else if(strcmp(argv[i],"vdi")==0) {
	XMountConfData.VirtImageType=TVirtImageType_VDI;
	LOG_DEBUG("Setting virtual image type to VDI\n")
	} else if(strcmp(argv[i],"vmdk")==0) {
	XMountConfData.VirtImageType=TVirtImageType_VMDK;
	LOG_DEBUG("Setting virtual image type to VMDK\n")
	} else {
	LOG_ERROR("Unknown output image type \"%s\"!\n",argv[i])
	return FALSE;
	}
	} else {
	LOG_ERROR("You must specify an output image type!\n");
	return FALSE;
	}
	} else {
	LOG_ERROR("Unknown command line option \"%s\"\n",argv[i]);
	return FALSE;
	}
	}
	i++;
	}

	// Parse input image filename(s)
	while(i<(argc-1)) {
	files++;
	(pppFilenames)=(char)realloc((pppFilenames),filessizeof(char));
	if((*pppFilenames)==NULL) {
	LOG_ERROR("Couldn't allocate memmory for input image filename(s)!\n")
	return FALSE;
	}
	(pppFilenames)[files-1]=(char)malloc((strlen(argv[i])+1)*sizeof(char));
	if((*pppFilenames)[files-1]==NULL) {
	LOG_ERROR("Couldn't allocate memmory for input image filename(s)!\n")
	return FALSE;
	}
	strncpy((*pppFilenames)[files-1],argv[i],strlen(argv[i])+1);
	i++;
	}
	*pFilenameCount=files;

	// Extract mountpoint
	if(argc>1) {
	(ppMountpoint)=(char)malloc((strlen(argv[argc-1])+1)*sizeof(char));
	if((*ppMountpoint)==NULL) {
	LOG_ERROR("Couldn't allocate memmory for mountpoint!\n")
	return FALSE;
	}
	strncpy(*ppMountpoint,argv[argc-1],strlen(argv[argc-1])+1);
	opts++;
	(pppNargv)=(char)realloc((pppNargv),optssizeof(char));
	if((*pppNargv)==NULL) {
	LOG_ERROR("Couldn't allocate memmory for mountpoint!\n")
	return FALSE;
	}
	(pppNargv)[opts-1]=(char)malloc((strlen(argv[i])+1)*sizeof(char));
	if((*pppNargv)[opts-1]==NULL) {
	LOG_ERROR("Couldn't allocate memmory for mountpoint!\n")
	return FALSE;
	}
	strncpy((pppNargv)[opts-1],ppMountpoint,strlen((*ppMountpoint))+1);
	}

	*pNargc=opts;

	return TRUE;
	}

	/*
	* InitVirtImageInfoFile:
	* Create virtual image info file
	*
	* Params:
	* n/a
	*
	* Returns:
	* "TRUE" on success, "FALSE" on error
	*/
	static int InitVirtImageInfoFile() {
	char buf[200];
	uint8_t md5_buf[16];
	int ret;

	#define M_CHECK_ALLOC { \
	if(pVirtualImageInfoFile==NULL) { \
	LOG_ERROR("Couldn't allocate memmory!\n"); \
	return FALSE; \
	} \
	}

	// Add static header to file
	pVirtualImageInfoFile=(char*)malloc((strlen(IMAGE_INFO_HEADER)+1));
	M_CHECK_ALLOC
	strncpy(pVirtualImageInfoFile,IMAGE_INFO_HEADER,strlen(IMAGE_INFO_HEADER)+1);

	switch(XMountConfData.OrigImageType) {
	case TOrigImageType_DD:
	// Original image is a DD file. There isn't much info to extract. Perhaps
	// just add image size
	// TODO: Add infos to virtual image info file
	break;
	#ifdef HAVE_LIBEWF

	#define M_SAVE_VALUE(DESC) { \
	if(ret==1) { \
	pVirtualImageInfoFile=(char*)realloc(pVirtualImageInfoFile, \
	(strlen(pVirtualImageInfoFile)+strlen(buf)+strlen(DESC)+2)); \
	M_CHECK_ALLOC \
	strncpy((pVirtualImageInfoFile+strlen(pVirtualImageInfoFile)),DESC,strlen(DESC)+1); \
	strncpy((pVirtualImageInfoFile+strlen(pVirtualImageInfoFile)),buf,strlen(buf)+1); \
	strncpy((pVirtualImageInfoFile+strlen(pVirtualImageInfoFile)),"\n",2); \
	} else if(ret==-1) { \
	LOG_ERROR("Couldn't query EWF image info!\n") \
	return FALSE; \
	} \
	}

	case TOrigImageType_EWF:
	// Original image is an EWF file. Extract various infos from ewf file and
	// add them to the virtual image info file content.
	ret=libewf_get_header_value_case_number(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("Case number: ")
	ret=libewf_get_header_value_description(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("Description: ")
	ret=libewf_get_header_value_examiner_name(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("Examiner: ")
	ret=libewf_get_header_value_evidence_number(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("Evidence number: ")
	ret=libewf_get_header_value_notes(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("Notes: ")
	ret=libewf_get_header_value_acquiry_date(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("Acquiry date: ")
	ret=libewf_get_header_value_system_date(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("System date: ")
	ret=libewf_get_header_value_acquiry_operating_system(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("Acquiry os: ")
	ret=libewf_get_header_value_acquiry_software_version(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("Acquiry sw version: ")
	ret=libewf_get_hash_value_md5(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("MD5 hash: ")
	ret=libewf_get_hash_value_sha1(hEwfFile,buf,sizeof(buf));
	M_SAVE_VALUE("SHA1 hash: ")
	break;

	#undef M_SAVE_VALUE

	#endif
	#ifdef HAVE_LIBAFF
	case TOrigImageType_AFF:
	// Original image is an AFF file.
	// TODO: Implement AFF image type handling
	LOG_ERROR("AFF image type handling not implemented!\n")
	return FALSE;
	break;
	#endif
	default:
	LOG_ERROR("Unsupported input image type!\n")
	return FALSE;
	}

	#undef M_CHECK_ALLOC

	return TRUE;
	}

	/*
	* InitCacheFile:
	* Create / load cache file to enable virtual write support
	*
	* Params:
	* n/a
	*
	* Returns:
	* "TRUE" on success, "FALSE" on error
	*/
	static int InitCacheFile() {
	uint64_t ImageSize=0;
	uint64_t BlockIndexSize=0;
	uint64_t CacheFileHeaderSize=0;
	uint64_t CacheFileSize=0;
	uint32_t NeededBlocks=0;
	uint64_t buf;

	hCacheFile=(FILE*)fopen64(XMountConfData.pCacheFile,"rb+");
	if(hCacheFile==NULL) {
	// As the c lib seems to have no possibility to open a file rw wether it
	// exists or not (w+ does not work because it truncates an existing file),
	// when r+ returns NULL the file could simply not exist
	LOG_DEBUG("Cache file does not exist. Creating new one\n")
	hCacheFile=(FILE*)fopen64(XMountConfData.pCacheFile,"wb+");
	if(hCacheFile==NULL) {
	// There is really a problem opening the file
	LOG_ERROR("Couldn't open cache file \"%s\"!\n",
	XMountConfData.pCacheFile)
	return FALSE;
	}
	}

	// Get input image size
	if(!GetOrigImageSize(&ImageSize)) {
	LOG_ERROR("Couldn't get input image size!\n")
	return FALSE;
	}

	// Calculate how many blocks are needed and how big the buffers must be
	// for the actual cache file version
	NeededBlocks=ImageSize/CACHE_BLOCK_SIZE;
	if((ImageSize%CACHE_BLOCK_SIZE)!=0) NeededBlocks++;
	BlockIndexSize=NeededBlocks*sizeof(TCacheFileBlockIndex);
	CacheFileHeaderSize=sizeof(TCacheFileHeader)+BlockIndexSize;
	LOG_DEBUG("Cache blocks: %u (%04X) entries, %zd (%08zX) bytes\n",
	NeededBlocks,
	NeededBlocks,
	BlockIndexSize,
	BlockIndexSize)

	// Get cache file size
	// fseeko64 had massive problems!
	if(fseeko(hCacheFile,0,SEEK_END)!=0) {
	LOG_ERROR("Couldn't seek to end of cache file!\n")
	return FALSE;
	}
	// Same here, ftello64 didn't work at all and returned 0 all the times
	CacheFileSize=ftello(hCacheFile);
	LOG_DEBUG("Cache file has %zd bytes\n",CacheFileSize)

	if(CacheFileSize>0) {
	// Cache file isn't empty, parse block header
	LOG_DEBUG("Cache file not empty. Parsing block header\n")
	if(fseeko(hCacheFile,0,SEEK_SET)!=0) {
	LOG_ERROR("Couldn't seek to beginning of cache file!\n")
	return FALSE;
	}
	// Read and check file signature
	if(fread(&buf,8,1,hCacheFile)!=1 \|\| buf!=CACHE_FILE_SIGNATURE) {
	free(pCacheFileHeader);
	LOG_ERROR("Not an xmount cache file or cache file corrupt!\n")
	return FALSE;
	}
	// Now get cache file version (Has only 32bit!)
	if(fread(&buf,4,1,hCacheFile)!=1) {
	free(pCacheFileHeader);
	LOG_ERROR("Not an xmount cache file or cache file corrupt!\n")
	return FALSE;
	}
	switch((uint32_t)buf) {
	case 0x0001:
	// Actual version (1)
	if(fseeko(hCacheFile,0,SEEK_SET)!=0) {
	LOG_ERROR("Couldn't seek to beginning of cache file!\n")
	return FALSE;
	}
	// Alloc memmory for header and block index
	pCacheFileHeader=(pTCacheFileHeader)malloc(CacheFileHeaderSize);
	if(pCacheFileHeader==NULL) {
	LOG_ERROR("Couldn't alloc memmory for cache file header!\n")
	return FALSE;
	}
	memset(pCacheFileHeader,0,CacheFileHeaderSize);
	// Read header and block index from file
	if(fread(pCacheFileHeader,CacheFileHeaderSize,1,hCacheFile)!=1) {
	// Cache file isn't big enough
	free(pCacheFileHeader);
	LOG_ERROR("Cache file corrupt!\n")
	return FALSE;
	}
	break;
	default:
	LOG_ERROR("Unknown cache file version!\n")
	return FALSE;
	}
	// Set pointer to block index
	pCacheFileBlockIndex=(pTCacheFileBlockIndex)((void*)pCacheFileHeader+
	pCacheFileHeader->pBlockIndex);
	} else {
	// New cache file, generate a new block header
	LOG_DEBUG("Cache file is empty. Generating new block header\n");
	// Alloc memmory for header and block index
	pCacheFileHeader=(pTCacheFileHeader)malloc(CacheFileHeaderSize);
	if(pCacheFileHeader==NULL) {
	LOG_ERROR("Couldn't alloc memmory for cache file header!\n")
	return FALSE;
	}
	memset(pCacheFileHeader,0,CacheFileHeaderSize);
	pCacheFileHeader->FileSignature=CACHE_FILE_SIGNATURE;
	pCacheFileHeader->CacheFileVersion=CACHE_FILE_VERSION;
	pCacheFileHeader->BlockCount=NeededBlocks;
	//pCacheFileHeader->UsedBlocks=0;
	// The following pointer is only usuable when reading data from cache file
	pCacheFileHeader->pBlockIndex=sizeof(TCacheFileHeader);
	pCacheFileBlockIndex=(pTCacheFileBlockIndex)((void*)pCacheFileHeader+
	sizeof(TCacheFileHeader));
	pCacheFileHeader->VdiFileHeaderCached=0;
	pCacheFileHeader->pVdiFileHeader=0;
	// Write header to file
	if(fwrite(pCacheFileHeader,CacheFileHeaderSize,1,hCacheFile)!=1) {
	free(pCacheFileHeader);
	LOG_ERROR("Couldn't write cache file header to file!\n");
	return FALSE;
	}
	}
	return TRUE;
	}

	/*
	* Struct containing implemented FUSE functions
	*/
	static struct fuse_operations xmount_operations = {
	.getattr=GetVirtFileAttr,
	.readdir=GetVirtFiles,
	.open=OpenVirtFile,
	.read=ReadVirtFile,
	.write=WriteVirtFile
	// .release=mountewf_release,
	};

	/*
	* Main
	*/
	int main(int argc, char *argv[])
	{
	char **ppInputFilenames=NULL;
	int InputFilenameCount=0;
	int nargc=0;
	char **ppNargv=NULL;
	char *pMountpoint=NULL;
	int ret=1;
	int i=0;

	setbuf(stdout,NULL);
	setbuf(stderr,NULL);

	// Init XMountConfData
	XMountConfData.OrigImageType=TOrigImageType_DD;
	XMountConfData.VirtImageType=TVirtImageType_DD;
	XMountConfData.Debug=FALSE;
	XMountConfData.pVirtualImagePath=NULL;
	XMountConfData.pVirtualImageInfoPath=NULL;
	XMountConfData.Writable=FALSE;
	XMountConfData.pCacheFile=NULL;
	XMountConfData.OrigImageSize=0;
	XMountConfData.VirtImageSize=0;

	// Parse command line options
	if(!ParseCmdLine(argc,
	argv,
	&nargc,
	&ppNargv,
	&InputFilenameCount,
	&ppInputFilenames,
	&pMountpoint))
	{
	LOG_ERROR("Couldn't parse command line options!\n")
	PrintUsage(argv[0]);
	return 1;
	}

	// Check command line options
	if(nargc<2 \|\| InputFilenameCount==0 \|\| pMountpoint==NULL) {
	LOG_ERROR("Couldn't parse command line options!\n")
	PrintUsage(argv[0]);
	return 1;
	}

	#ifdef HAVE_LIBEWF
	// Check for valid ewf files
	if(XMountConfData.OrigImageType==TOrigImageType_EWF) {
	for(i=0;i<InputFilenameCount;i++) {
	if(libewf_check_file_signature(ppInputFilenames[i])!=1) {
	LOG_ERROR("File \"%s\" isn't a valid ewf file!\n",ppInputFilenames[i])
	return 1;
	}
	}
	}
	#endif

	// TODO: Check if mountpoint is a valid dir

	// Init semaphores
	sem_init(&sem_img_read,0,1);
	sem_init(&sem_vdiheader_read,0,1);
	sem_init(&sem_info_read,0,1);
	sem_init(&sem_cachefile_rw,0,1);

	if(InputFilenameCount==1) {
	LOG_DEBUG("Extracting infos from image file \"%s\"...\n",
	ppInputFilenames[0])
	} else {
	LOG_DEBUG("Extracting infos from image files \"%s .. %s\"...\n",
	ppInputFilenames[0],
	ppInputFilenames[InputFilenameCount-1])
	}

	// Init random generator
	srand(time(NULL));

	// Open input image
	switch(XMountConfData.OrigImageType) {
	case TOrigImageType_DD:
	// Input image is a DD file
	hDdFile=(FILE*)fopen64(ppInputFilenames[0],"rb");
	if(hDdFile==NULL) {
	LOG_ERROR("Couldn't open DD file \"%s\"\n",ppInputFilenames[0])
	return 1;
	}
	break;
	#ifdef HAVE_LIBEWF
	case TOrigImageType_EWF:
	// Input image is an EWF file or glob
	hEwfFile=libewf_open(ppInputFilenames,
	InputFilenameCount,
	libewf_get_flags_read());
	if(hEwfFile==NULL) {
	LOG_ERROR("Couldn't open EWF file(s)!\n")
	return 1;
	}
	// Parse EWF header
	if(libewf_parse_header_values(hEwfFile,0)!=1) {
	LOG_ERROR("Couldn't parse ewf header values!\n")
	return 1;
	}
	break;
	#endif
	#ifdef HAVE_LIBAFF
	case TOrigImageType_AFF:
	// Input image is an AFF file
	// TODO: Handle AFF image type
	LOG_ERROR("AFF image type handling isn't implemented!\n")
	return 1;
	//hAffFile=af_open(ppInputFilenames[0],
	break;
	#endif
	default:
	LOG_ERROR("Unsupported input image type specified!\n")
	return 1;
	}
	LOG_DEBUG("Input image file opened successfully\n")

	// Gather infos for info file
	if(!InitVirtImageInfoFile()) {
	LOG_ERROR("Couldn't gather infos for virtual image info file!\n")
	return 1;
	}
	LOG_DEBUG("Virtual image info file build successfully\n")

	// Do some virtual image type specific initialisations
	switch(XMountConfData.VirtImageType) {
	case TVirtImageType_VDI:
	// When mounting as VDI, we need to construct a vdi header
	if(!InitVirtVdiHeader()) {
	LOG_ERROR("Couldn't initialize virtual VDI file header!\n")
	return 1;
	}
	LOG_DEBUG("Virtual VDI file header build successfully\n")
	break;
	case TVirtImageType_VMDK:
	// When mounting as VMDK, we need to construct the VMDK descripto file
	// TODO: Construct VMDK file descriptor file
	break;
	}

	if(XMountConfData.Writable) {
	// Init cache file and cache file block index
	if(!InitCacheFile()) {
	LOG_ERROR("Couldn't initilaize cache file!\n")
	return 1;
	}
	LOG_DEBUG("Cache file initialized successfully\n")
	}

	if(!ExtractVirtFileNames(ppInputFilenames[0])) {
	LOG_ERROR("Couldn't extract virtual file names!\n");
	return 1;
	}
	LOG_DEBUG("Virtual file names extracted successfully\n")

	// Call fuse_main to do the fuse magic
	ret=fuse_main(nargc,ppNargv,&xmount_operations,NULL);

	// TODO: Perhaps wait for unposted sem's
	sem_destroy(&sem_cachefile_rw);
	sem_destroy(&sem_info_read);
	sem_destroy(&sem_vdiheader_read);
	sem_destroy(&sem_img_read);

	// Close input image
	switch(XMountConfData.OrigImageType) {
	case TOrigImageType_DD:
	fclose(hDdFile);
	break;
	#ifdef HAVE_LIBEWF
	case TOrigImageType_EWF:
	libewf_close(hEwfFile);
	break;
	#endif
	#ifdef HAVE_LIBAFF
	case TOrigImageType_AFF:
	af_close(hAffFile);
	break;
	#endif
	default:
	LOG_ERROR("Couldn't close unsupported input image type!\n");
	}

	if(XMountConfData.Writable) {
	// Write support was enabled, close cache file
	fclose(hCacheFile);
	free(pCacheFileHeader);
	}

	// Free allocated memmory
	if(XMountConfData.VirtImageType==TVirtImageType_VDI) {
	// Free constructed VDI header
	free(pVdiFileHeader);
	}
	for(i=0;i<InputFilenameCount;i++) free(ppInputFilenames[i]);
	free(ppInputFilenames);
	for(i=0;i<nargc;i++) free(ppNargv[i]);
	free(ppNargv);
	free(XMountConfData.pVirtualImagePath);
	free(XMountConfData.pVirtualImageInfoPath);
	free(XMountConfData.pCacheFile);

	return ret;
	}

	/*
	----- Change history -----
	20090131: v0.1.0 released
	* Some minor things have still to be done.
	* Mounting ewf as dd: Seems to work. Diff didn't complain about
	changes betwenn original dd and emulated dd.
	* Mounting ewf as vdi: Seems to work too. VBox accepts the emulated
	vdi as valid vdi file and I was able to mount the containing fs
	under Debian. INFO: Debian freezed when not using mount -r !!
	20090203: v0.1.1 released
	* Multiple code improvements. For ex. cleaner vdi header allocation.
	* Fixed severe bug in image block calculation. Didn't check for odd
	input in conversion from bytes to megabytes.
	* Added more debug output
	20090210: v0.1.2 released
	* Fixed compilation problem (Typo in image_init_info() function).
	* Fixed some problems with the debian scripts to be able to build
	packages.
	* Added random generator initialisation (Makes it possible to use
	more than one image in VBox at a time).
	20090215: * Added function init_cache_blocks which creates / loads a cache
	file used to implement virtual write capability.
	20090217: * Implemented the fuse write function. Did already some basic tests
	with dd and it seems to work. But there are certainly still some
	bugs left as there are also still some TODO's left.
	20090226: * Changed program name from mountewf to xmount.
	* Began with massive code cleanups to ease full implementation of
	virtual write support and to be able to support multiple input
	image formats (DD, EWF and AFF are planned for now).
	* Added defines for supported input formats so it should be possible
	to compile xmount without supporting all input formats. (DD
	input images are always supported as these do not require any
	additional libs). Input formats should later be en/disabled
	by the configure script in function to which libs it detects.
	* GetOrigImageSize function added to get the size of the original
	image whatever type it is in.
	* GetOrigImageData function added to retrieve data from original
	image file whatever type it is in.
	* GetVirtImageSize function added to get the size of the virtual
	image file.
	* Cleaned function mountewf_getattr and renamed it to
	GetVirtFileAttr
	* Cleaned function mountewf_readdir and renamed it to GetVirtFiles
	* Cleaned function mountewf_open and renamed it to OpenVirtFile
	20090227: * Cleaned function init_info_file and renamed it to
	InitVirtImageInfoFile
	20090228: * Cleaned function init_cache_blocks and renamed it to
	InitCacheFile
	* Added LogMessage function to ease error and debug logging (See
	also LOG_ERROR and LOG_DEBUG macros in xmount.h)
	* Cleaned function init_vdi_header and renamed it to
	InitVirtVdiHeader
	* Added PrintUsage function to print out xmount usage informations
	* Cleaned function parse_cmdline and renamed it to ParseCmdLine
	* Cleaned function main
	* Added ExtractVirtFileNames function to extract virtual file names
	from input image name
	* Added function GetVirtImageData to retrieve data from the virtual
	image file. This includes reading data from cache file if virtual
	write support is enabled.
	* Added function ReadVirtFile to replace mountewf_read
	20090229: * Fixed a typo in virtual file name creation
	* Added function SetVirtImageData to write data to virtual image
	file. This includes writing data to cache file and caching entire
	new blocks
	* Added function WriteVirtFile to replace mountewf_write
	20090305: * Solved a problem that made it impossible to access offsets >32bit
	20090308: * Added SetVdiFileHeaderData function to handle virtual image type
	specific data to be cached. This makes cache files independent
	from virtual image type
	20090316: v0.2.0 released
	20090327: v0.2.1 released
	* Fixed a bug in virtual write support. Checking whether data is
	cached didn't use semaphores. This could corrupt cache files
	when running multi-threaded.
	* Added IsVdiFileHeaderCached function to check whether VDI file
	header was already cached
	* Added IsBlockCached function to check whether a block was already
	cached
	*/

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