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libxmount_input_aff.c
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libxmount_input_aff.c
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/*******************************************************************************
* xmount Copyright (c) 2008-2016 by Gillen Daniel <gillen.dan@pinguin.lu> *
* *
* 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 <string.h>
#include <fcntl.h> // For O_RDONLY
#include "../libxmount_input.h"
#ifndef HAVE_LIBAFF_STATIC
#include <afflib/afflib.h>
#else
#include "libaff/lib/afflib.h"
#endif
#include "libxmount_input_aff.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 "aff\0\0";
}
/*
* LibXmount_Input_GetFunctions
*/
void LibXmount_Input_GetFunctions(ts_LibXmountInputFunctions *p_functions) {
p_functions->CreateHandle=&AffCreateHandle;
p_functions->DestroyHandle=&AffDestroyHandle;
p_functions->Open=&AffOpen;
p_functions->Close=&AffClose;
p_functions->Size=&AffSize;
p_functions->Read=&AffRead;
p_functions->OptionsHelp=&AffOptionsHelp;
p_functions->OptionsParse=&AffOptionsParse;
p_functions->GetInfofileContent=&AffGetInfofileContent;
p_functions->GetErrorMessage=&AffGetErrorMessage;
p_functions->FreeBuffer=&AffFreeBuffer;
}
/*******************************************************************************
* Private
******************************************************************************/
/*
* AffCreateHandle
*/
static int AffCreateHandle(void **pp_handle,
const char *p_format,
uint8_t debug)
{
(void)p_format;
pts_AffHandle p_aff_handle;
// Alloc new lib handle
p_aff_handle=(pts_AffHandle)malloc(sizeof(ts_AffHandle));
if(p_aff_handle==NULL) return AFF_MEMALLOC_FAILED;
// Init lib handle
p_aff_handle->h_aff=NULL;
*pp_handle=p_aff_handle;
return AFF_OK;
}
/*
* AffDestroyHandle
*/
static int AffDestroyHandle(void **pp_handle) {
pts_AffHandle p_aff_handle=(pts_AffHandle)*pp_handle;
// Free lib handle
if(p_aff_handle!=NULL) free(p_aff_handle);
*pp_handle=NULL;
return AFF_OK;
}
/*
* AffOpen
*/
static int AffOpen(void *p_handle,
const char **pp_filename_arr,
uint64_t filename_arr_len)
{
pts_AffHandle p_aff_handle=(pts_AffHandle)p_handle;
// We need exactly one file
if(filename_arr_len==0) return AFF_NO_INPUT_FILES;
if(filename_arr_len>1) return AFF_TOO_MANY_INPUT_FILES;
// Open AFF file
p_aff_handle->h_aff=af_open(pp_filename_arr[0],O_RDONLY,0);
if(p_aff_handle->h_aff==NULL) {
// LOG_ERROR("Couldn't open AFF file!\n")
return AFF_OPEN_FAILED;
}
// Encrypted images aren't supported for now
// TODO: Add support trough lib params, f. ex. aff_password=xxxx
if(af_cannot_decrypt(p_aff_handle->h_aff)) {
af_close(p_aff_handle->h_aff);
return AFF_ENCRYPTION_UNSUPPORTED;
}
return AFF_OK;
}
/*
* AffClose
*/
static int AffClose(void *p_handle) {
pts_AffHandle p_aff_handle=(pts_AffHandle)p_handle;
// Close AFF handle
if(af_close(p_aff_handle->h_aff)!=0) return AFF_CLOSE_FAILED;
return AFF_OK;
}
/*
* AffSize
*/
static int AffSize(void *p_handle, uint64_t *p_size) {
pts_AffHandle p_aff_handle=(pts_AffHandle)p_handle;
// TODO: Check for error. Unfortunately, I don't know how :(
*p_size=af_seek(p_aff_handle->h_aff,0,SEEK_END);
return AFF_OK;
}
/*
* AffRead
*/
static int AffRead(void *p_handle,
char *p_buf,
off_t offset,
size_t count,
size_t *p_read,
int *p_errno)
{
pts_AffHandle p_aff_handle=(pts_AffHandle)p_handle;
size_t bytes_read;
// Seek to requested position
if(af_seek(p_aff_handle->h_aff,offset,SEEK_SET)!=offset) {
return AFF_SEEK_FAILED;
}
// Read data
// TODO: Check for errors
bytes_read=af_read(p_aff_handle->h_aff,(unsigned char*)p_buf,count);
if(bytes_read!=count) return AFF_READ_FAILED;
*p_read=bytes_read;
return AFF_OK;
}
/*
* AffOptionsHelp
*/
static int AffOptionsHelp(const char **pp_help) {
*pp_help=NULL;
return AFF_OK;
}
/*
* AffOptionsParse
*/
static int AffOptionsParse(void *p_handle,
uint32_t options_count,
const pts_LibXmountOptions *pp_options,
const char **pp_error)
{
return AFF_OK;
}
/*
* AffGetInfofileContent
*/
static int AffGetInfofileContent(void *p_handle, const char **pp_info_buf) {
// TODO
*pp_info_buf=NULL;
return AFF_OK;
}
/*
* AffGetErrorMessage
*/
static const char* AffGetErrorMessage(int err_num) {
switch(err_num) {
case AFF_MEMALLOC_FAILED:
return "Unable to allocate memory";
break;
case AFF_NO_INPUT_FILES:
return "No input file(s) specified";
break;
case AFF_TOO_MANY_INPUT_FILES:
return "Too many input files specified";
break;
case AFF_OPEN_FAILED:
return "Unable to open EWF file(s)";
break;
case AFF_CLOSE_FAILED:
return "Unable to close EWF file(s)";
break;
case AFF_ENCRYPTION_UNSUPPORTED:
return "Encrypted AFF files are currently not supported";
break;
case AFF_SEEK_FAILED:
return "Unable to seek into EWF data";
break;
case AFF_READ_FAILED:
return "Unable to read EWF data";
break;
default:
return "Unknown error";
}
}
/*
* AffFreeBuffer
*/
static int AffFreeBuffer(void *p_buf) {
free(p_buf);
return AFF_OK;
}
/*
----- Change log -----
20140724: * Initial version implementing AffOpen, AffSize, AffRead, AffClose,
AffOptionsHelp, AffOptionsParse and AffFreeBuffer
20140804: * Added error handling and AffGetErrorMessage
*/

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