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libxmount_input_dd.c
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libxmount_input_dd.c
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/*******************************************************************************
* xmount Copyright (c) 2008-2013 by Gillen Daniel <gillen.dan@pinguin.lu> *
* *
* This module has been written by Guy Voncken. It contains the functions for *
* accessing dd images. Split dd is supported as well. *
* *
* 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/>. *
*******************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "../libxmount_input.h"
#include "libxmount_input_dd.h"
/*******************************************************************************
* LibXmount_Input API implementation
******************************************************************************/
/*
* LibXmount_Input_GetApiVersion
*/
uint8_t LibXmount_Input_GetApiVersion() {
return LIBXMOUNT_INPUT_API_VERSION;
}
/*
* LibXmount_Input_GetSupportedFormats
*/
const char* LibXmount_Input_GetSupportedFormats() {
return "dd\0\0";
}
/*
* LibXmount_Input_GetFunctions
*/
void LibXmount_Input_GetFunctions(ts_LibXmountInputFunctions *p_functions) {
p_functions->CreateHandle=&DdCreateHandle;
p_functions->DestroyHandle=&DdDestroyHandle;
p_functions->Open=&DdOpen;
p_functions->Close=&DdClose;
p_functions->Size=&DdSize;
p_functions->Read=&DdRead;
p_functions->OptionsHelp=&DdOptionsHelp;
p_functions->OptionsParse=&DdOptionsParse;
p_functions->GetInfofileContent=&DdGetInfofileContent;
p_functions->GetErrorMessage=&DdGetErrorMessage;
p_functions->FreeBuffer=&DdFreeBuffer;
}
/*******************************************************************************
* Private
******************************************************************************/
// ---------------------------
// Internal static functions
// ---------------------------
static inline uint64_t DdGetCurrentSeekPos (t_pPiece pPiece)
{
return ftello (pPiece->pFile);
}
static inline int DdSetCurrentSeekPos (t_pPiece pPiece,
uint64_t Val,
int Whence)
{
if (fseeko (pPiece->pFile, Val, Whence) != 0) return DD_CANNOT_SEEK;
return DD_OK;
}
static int DdRead0 (t_pdd pdd, uint64_t Seek, char *pBuffer, uint32_t *pCount)
{
t_pPiece pPiece;
uint64_t i;
// Find correct piece to read from
// -------------------------------
for (i=0; i<pdd->Pieces; i++)
{
pPiece = &pdd->pPieceArr[i];
if (Seek < pPiece->FileSize) break;
Seek -= pPiece->FileSize;
}
if (i >= pdd->Pieces) return DD_READ_BEYOND_END_OF_IMAGE;
// Read from this piece
// --------------------
CHK (DdSetCurrentSeekPos (pPiece, Seek, SEEK_SET))
*pCount = GETMIN (*pCount, pPiece->FileSize - Seek);
if (fread (pBuffer, *pCount, 1, pPiece->pFile) != 1)
{
return DD_CANNOT_READ_DATA;
}
return DD_OK;
}
// ---------------
// API functions
// ---------------
/*
* DdCreateHandle
*/
static int DdCreateHandle(void **pp_handle) {
t_pdd p_dd=(t_pdd)*pp_handle;
p_dd=(t_pdd)malloc(sizeof(t_dd));
if(p_dd==NULL) return DD_MEMALLOC_FAILED;
memset(p_dd,0,sizeof(t_dd));
return DD_OK;
}
/*
* DdDestroyHandle
*/
static int DdDestroyHandle(void **pp_handle) {
free(*pp_handle);
*pp_handle=NULL;
return DD_OK;
}
/*
* DdOpen
*/
static int DdOpen(void **pp_handle,
const char **pp_filename_arr,
uint64_t filename_arr_len)
{
t_pdd pdd=(t_pdd)*pp_handle;
t_pPiece pPiece;
pdd->Pieces = filename_arr_len;
pdd->pPieceArr = (t_pPiece) malloc (pdd->Pieces * sizeof(t_Piece));
if (pdd->pPieceArr == NULL) return DD_MEMALLOC_FAILED;
// Need to set everything to 0 in case an error occurs later and DdClose is
// called
memset(pdd->pPieceArr,0,pdd->Pieces * sizeof(t_Piece));
pdd->TotalSize = 0;
for (uint64_t i=0; i < pdd->Pieces; i++)
{
pPiece = &pdd->pPieceArr[i];
pPiece->pFilename = strdup (pp_filename_arr[i]);
if (pPiece->pFilename == NULL)
{
(void)DdClose(pp_handle);
return DD_MEMALLOC_FAILED;
}
pPiece->pFile = fopen (pPiece->pFilename, "r");
if (pPiece->pFile == NULL)
{
(void)DdClose(pp_handle);
return DD_FILE_OPEN_FAILED;
}
CHK(DdSetCurrentSeekPos(pPiece, 0, SEEK_END))
pPiece->FileSize = DdGetCurrentSeekPos (pPiece);
pdd->TotalSize += pPiece->FileSize;
}
return DD_OK;
}
/*
* DdClose
*/
static int DdClose(void **pp_handle) {
t_pdd pdd = (t_pdd)*pp_handle;
t_pPiece pPiece;
int CloseErrors = 0;
if (pdd->pPieceArr)
{
for (uint64_t i=0; i < pdd->Pieces; i++)
{
pPiece = &pdd->pPieceArr[i];
if (pPiece->pFile) {
if (fclose (pPiece->pFile)) CloseErrors=1;
}
if (pPiece->pFilename) free (pPiece->pFilename);
}
free (pdd->pPieceArr);
}
if (CloseErrors) return DD_CANNOT_CLOSE_FILE;
return DD_OK;
}
/*
* DdSize
*/
static int DdSize(void *p_handle, uint64_t *p_size) {
*p_size=((t_pdd)p_handle)->TotalSize;
return DD_OK;
}
/*
* DdRead
*/
static int DdRead(void *p_handle,
uint64_t seek,
char *p_buf,
uint32_t count)
{
uint32_t remaining=count;
uint32_t read;
if((seek+count)>((t_pdd)p_handle)->TotalSize) {
return DD_READ_BEYOND_END_OF_IMAGE;
}
do {
read=remaining;
CHK(DdRead0((t_pdd)p_handle,seek,p_buf,&read))
remaining-=read;
p_buf+=read;
seek+=read;
} while(remaining);
return DD_OK;
}
/*
* DdOptionsHelp
*/
static const char* DdOptionsHelp() {
return NULL;
}
/*
* DdOptionsParse
*/
static int DdOptionsParse(void *p_handle, char *p_options, char **pp_error) {
return DD_OK;
}
/*
* DdGetInfofileContent
*/
static int DdGetInfofileContent(void *p_handle, char **pp_info_buf) {
asprintf(pp_info_buf,
"DD image assembled of %" PRIu64 " pieces\n"
"%" PRIu64 " bytes in total (%0.3f GiB)",
((t_pdd)p_handle)->Pieces,
((t_pdd)p_handle)->TotalSize,
((t_pdd)p_handle)->TotalSize/(1024.0*1024.0*1024.0));
if(*pp_info_buf==NULL) return DD_MEMALLOC_FAILED;
return DD_OK;
}
/*
* DdGetErrorMessage
*/
static const char* DdGetErrorMessage(int err_num) {
switch(err_num) {
case DD_MEMALLOC_FAILED:
return "Unable to allocate memory";
break;
case DD_FILE_OPEN_FAILED:
return "Unable to open DD file(s)";
break;
case DD_CANNOT_READ_DATA:
return "Unable to read DD data";
break;
case DD_CANNOT_CLOSE_FILE:
return "Unable to close DD file(s)";
break;
case DD_CANNOT_SEEK:
return "Unable to seek into DD data";
break;
case DD_READ_BEYOND_END_OF_IMAGE:
return "Unable to read DD data: Attempt to read past EOF";
break;
default:
return "Unknown error";
}
}
/*
* DdFreeBuffer
*/
static void DdFreeBuffer(void *p_buf) {
free(p_buf);
}
// -----------------------------------------------------
// Small main routine for testing
// It a split dd file to non-split dd
// -----------------------------------------------------
#ifdef DD_MAIN_FOR_TESTING
int main(int argc, const char *argv[])
{
t_pdd pdd;
uint64_t TotalSize;
uint64_t Remaining;
uint64_t Read;
uint64_t Pos;
uint32_t BuffSize = 1024;
char Buff[BuffSize];
FILE *pFile;
int Percent;
int PercentOld;
int rc;
printf ("Split DD to DD converter\n");
if (argc < 3)
{
printf ("Usage: %s <dd part 1> <dd part 2> <...> <dd destination>\n", argv[0]);
exit (1);
}
if (DdOpen ((void**)&pdd, argc-2, &argv[1]) != DD_OK)
{
printf ("Cannot open split dd file\n");
exit (1);
}
CHK (DdSize ((void*)pdd, &TotalSize))
printf ("Total size: %llu bytes\n", TotalSize);
Remaining = TotalSize;
pFile = fopen (argv[argc-1], "w");
if (pFile == NULL)
{
printf ("Cannot open destination file\n");
exit (1);
}
Remaining = TotalSize;
Pos = 0;
PercentOld = -1;
while (Remaining)
{
Read = GETMIN (Remaining, BuffSize);
rc = DdRead ((void*)pdd, Pos, &Buff[0], Read);
if (rc != DD_OK)
{
printf ("Error %d while calling DdRead\n", rc);
exit (1);
}
if (fwrite (Buff, Read, 1, pFile) != 1)
{
printf ("Could not write to destinationfile\n");
exit (2);
}
Remaining -= Read;
Pos += Read;
Percent = (100*Pos) / TotalSize;
if (Percent != PercentOld)
{
printf ("\r%d%% done...", Percent);
PercentOld = Percent;
}
}
if (fclose (pFile))
{
printf ("Error while closing destinationfile\n");
exit (3);
}
printf ("\n");
return 0;
}
#endif // DD_MAIN_FOR_TESTING

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