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libewf_io_handle.c
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libewf_io_handle.c
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/*
* IO handle functions
*
* Copyright (c) 2006-2011, Joachim Metz <jbmetz@users.sourceforge.net>
*
* Refer to AUTHORS for acknowledgements.
*
* This software is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This software 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 Lesser General Public License
* along with this software. If not, see <http://www.gnu.org/licenses/>.
*/
#include <common.h>
#include <memory.h>
#include <types.h>
#include <liberror.h>
#include "libewf_codepage.h"
#include "libewf_definitions.h"
#include "libewf_io_handle.h"
#include "ewf_definitions.h"
/* Initialize the IO handle
* Returns 1 if successful or -1 on error
*/
int libewf_io_handle_initialize(
libewf_io_handle_t **io_handle,
liberror_error_t **error )
{
static char *function = "libewf_io_handle_initialize";
if( io_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid IO handle.",
function );
return( -1 );
}
if( *io_handle == NULL )
{
*io_handle = memory_allocate_structure(
libewf_io_handle_t );
if( io_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_MEMORY,
LIBERROR_MEMORY_ERROR_INSUFFICIENT,
"%s: unable to create IO handle.",
function );
goto on_error;
}
if( memory_set(
*io_handle,
0,
sizeof( libewf_io_handle_t ) ) == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_MEMORY,
LIBERROR_MEMORY_ERROR_SET_FAILED,
"%s: unable to clear IO handle.",
function );
goto on_error;
}
( *io_handle )->format = LIBEWF_FORMAT_ENCASE5;
( *io_handle )->ewf_format = EWF_FORMAT_E01;
( *io_handle )->compression_level = EWF_COMPRESSION_NONE;
( *io_handle )->header_codepage = LIBEWF_CODEPAGE_ASCII;
}
return( 1 );
on_error:
if( *io_handle != NULL )
{
memory_free(
*io_handle );
*io_handle = NULL;
}
return( -1 );
}
/* Frees the IO handle including elements
* Returns 1 if successful or -1 on error
*/
int libewf_io_handle_free(
libewf_io_handle_t **io_handle,
liberror_error_t **error )
{
static char *function = "libewf_io_handle_free";
if( io_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid IO handle.",
function );
return( 1 );
}
if( *io_handle != NULL )
{
memory_free(
*io_handle );
*io_handle = NULL;
}
return( 1 );
}
/* Clones the IO handle
* Returns 1 if successful or -1 on error
*/
int libewf_io_handle_clone(
libewf_io_handle_t **destination_io_handle,
libewf_io_handle_t *source_io_handle,
liberror_error_t **error )
{
static char *function = "libewf_io_handle_clone";
if( destination_io_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_ARGUMENTS,
LIBERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid destination IO handle.",
function );
return( -1 );
}
if( *destination_io_handle != NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_RUNTIME,
LIBERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,
"%s: invalid destination IO handle value already set.",
function );
return( -1 );
}
if( source_io_handle == NULL )
{
*destination_io_handle = NULL;
return( 1 );
}
*destination_io_handle = memory_allocate_structure(
libewf_io_handle_t );
if( *destination_io_handle == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_MEMORY,
LIBERROR_MEMORY_ERROR_INSUFFICIENT,
"%s: unable to create destination IO handle.",
function );
goto on_error;
}
if( memory_copy(
*destination_io_handle,
source_io_handle,
sizeof( libewf_io_handle_t ) ) == NULL )
{
liberror_error_set(
error,
LIBERROR_ERROR_DOMAIN_MEMORY,
LIBERROR_MEMORY_ERROR_COPY_FAILED,
"%s: unable to copy source to destination IO handle.",
function );
goto on_error;
}
return( 1 );
on_error:
if( *destination_io_handle != NULL )
{
memory_free(
*destination_io_handle );
*destination_io_handle = NULL;
}
return( -1 );
}

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