/* * 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 );}