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libewf_chunk_cache.c
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libewf_chunk_cache.c
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/*
* libewf chunk_cache
*
* Copyright (c) 2006-2007, Joachim Metz <forensics@hoffmannbv.nl>,
* Hoffmann Investigations. All rights reserved.
*
* Refer to AUTHORS for acknowledgements.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the creator, related organisations, nor the names of
* its contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
* - All advertising materials mentioning features or use of this software
* must acknowledge the contribution by people stated in the acknowledgements.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER, COMPANY AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include "libewf_includes.h"
#include "libewf_chunk_cache.h"
#include "libewf_common.h"
#include "libewf_notify.h"
/* Allocates memory for the chunk cache cache
* Returns a pointer to the new instance, NULL on error
*/
LIBEWF_CHUNK_CACHE *libewf_chunk_cache_alloc( size_t size )
{
LIBEWF_CHUNK_CACHE *chunk_cache = NULL;
chunk_cache = (LIBEWF_CHUNK_CACHE *) libewf_common_alloc( LIBEWF_CHUNK_CACHE_SIZE );
if( chunk_cache == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_alloc: unable to allocate chunk cache.\n" );
return( NULL );
}
size *= EWF_CHUNK_SIZE;
if( size > (size_t) SSIZE_MAX )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_alloc: invalid size value exceeds maximum.\n" );
return( NULL );
}
chunk_cache->compressed = (EWF_CHUNK *) libewf_common_alloc( size );
if( chunk_cache->compressed == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_alloc: unable to create chunk (compressed).\n" );
libewf_common_free( chunk_cache );
return( NULL );
}
chunk_cache->data = (EWF_CHUNK *) libewf_common_alloc( size );
if( chunk_cache->data == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_alloc: unable to create chunk (data).\n" );
libewf_common_free( chunk_cache->compressed );
libewf_common_free( chunk_cache );
return( NULL );
}
chunk_cache->allocated_size = size;
chunk_cache->chunk = 0;
chunk_cache->amount = 0;
chunk_cache->offset = 0;
chunk_cache->cached = 0;
return( chunk_cache );
}
/* Reallocates and wipes memory for the chunk cache cache
* Returns a pointer to the instance, NULL on error
*/
LIBEWF_CHUNK_CACHE *libewf_chunk_cache_realloc( LIBEWF_CHUNK_CACHE *chunk_cache, size_t size )
{
EWF_CHUNK *reallocation = NULL;
if( chunk_cache == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_realloc: invalid chunk cache.\n" );
return( NULL );
}
size *= EWF_CHUNK_SIZE;
if( size > (size_t) SSIZE_MAX )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_realloc: invalid size value exceeds maximum.\n" );
return( NULL );
}
if( size <= chunk_cache->allocated_size )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_realloc: new size must be greater than previous size.\n" );
return( NULL );
}
reallocation = (EWF_CHAR *) libewf_common_realloc( (void *) chunk_cache->compressed, size );
if( reallocation == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_realloc: unable to realloc chunk (compressed).\n" );
return( NULL );
}
chunk_cache->compressed = reallocation;
reallocation = (EWF_CHAR *) libewf_common_realloc( (void *) chunk_cache->data, size );
if( reallocation == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_realloc: unable to realloc chunk (data).\n" );
return( NULL );
}
chunk_cache->data = reallocation;
chunk_cache->allocated_size = size;
chunk_cache->chunk = 0;
chunk_cache->amount = 0;
chunk_cache->offset = 0;
chunk_cache->cached = 0;
return( chunk_cache );
}
/* Frees memory of a chunk cache struct including elements
*/
void libewf_chunk_cache_free( LIBEWF_CHUNK_CACHE *chunk_cache )
{
if( chunk_cache == NULL )
{
LIBEWF_WARNING_PRINT( "libewf_chunk_cache_free: invalid chunk cache.\n" );
return;
}
libewf_common_free( chunk_cache->compressed );
libewf_common_free( chunk_cache->data );
libewf_common_free( chunk_cache );
}

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