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ewf_string.c
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ewf_string.c
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/*
* EWF character type string functions
*
* 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_common.h"
#include "libewf_notify.h"
#include "ewf_compress.h"
#include "ewf_string.h"
/* Uncompresses the string
* Returns a pointer to the new instance, NULL on error
*/
EWF_CHAR *ewf_string_uncompress( EWF_CHAR *compressed_string, size_t *size )
{
EWF_CHAR *uncompressed_string = NULL;
EWF_CHAR *reallocation = NULL;
size_t compressed_size = 0;
int8_t result = 0;
if( compressed_string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_uncompress: invalid compressed string.\n" );
return( NULL );
}
if( size == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_uncompress: invalid size.\n" );
return( NULL );
}
compressed_size = *size;
/* On average the uncompressed string will be twice as large
*/
*size *= 2;
/* Add a byte for the end of string
*/
uncompressed_string = (EWF_CHAR *) libewf_common_alloc( EWF_CHAR_SIZE * ( *size + 1 ) );
if( uncompressed_string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_uncompress: unable to allocate uncompressed string.\n" );
return( NULL );
}
result = ewf_uncompress( (uint8_t *) uncompressed_string, size, (uint8_t *) compressed_string, compressed_size );
while( ( result == -1 ) && ( *size > 0 ) )
{
/* Add a byte for the end of string
*/
reallocation = (EWF_CHAR *) libewf_common_realloc( uncompressed_string, ( *size + 1 ) );
if( reallocation == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_uncompress: unable to reallocate uncompressed string.\n" );
libewf_common_free( uncompressed_string );
return( NULL );
}
uncompressed_string = reallocation;
result = ewf_uncompress( (uint8_t *) uncompressed_string, size, (uint8_t *) compressed_string, compressed_size );
}
if( result == -1 )
{
LIBEWF_WARNING_PRINT( "ewf_string_uncompress: unable to uncompress string.\n" );
libewf_common_free( uncompressed_string );
return( NULL );
}
uncompressed_string[ *size ] = (EWF_CHAR) '\0';
*size += 1;
return( uncompressed_string );
}
/* Compresses the string
* Returns a pointer to the new instance, NULL on error
*/
EWF_CHAR *ewf_string_compress( EWF_CHAR *uncompressed_string, size_t *size, int8_t compression_level )
{
EWF_CHAR *compressed_string = NULL;
EWF_CHAR *reallocation = NULL;
size_t uncompressed_size = 0;
int8_t result = 0;
if( uncompressed_string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_compress: invalid uncompressed string.\n" );
return( NULL );
}
if( size == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_compress: invalid size.\n" );
return( NULL );
}
uncompressed_size = *size;
compressed_string = (EWF_CHAR *) libewf_common_alloc( EWF_CHAR_SIZE * *size );
if( compressed_string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_compress: unable to allocate compressed string.\n" );
return( NULL );
}
result = ewf_compress( (uint8_t *) compressed_string, size, (uint8_t *) uncompressed_string, uncompressed_size, compression_level );
if( ( result == -1 ) && ( *size > 0 ) )
{
reallocation = (EWF_CHAR *) libewf_common_realloc( compressed_string, *size );
if( reallocation == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_compress: unable to reallocate compressed string.\n" );
libewf_common_free( compressed_string );
return( NULL );
}
compressed_string = reallocation;
result = ewf_compress( (uint8_t *) compressed_string, size, (uint8_t *) uncompressed_string, uncompressed_size, compression_level );
}
if( result == -1 )
{
LIBEWF_WARNING_PRINT( "ewf_string_compress: unable to compress string.\n" );
libewf_common_free( compressed_string );
return( NULL );
}
return( compressed_string );
}
/* Reads the string from a file descriptor into a buffer
* Returns the amount of bytes read on success, -1 on error
*/
ssize_t ewf_string_read_to_buffer( EWF_CHAR *string, int file_descriptor, size_t size )
{
ssize_t count = 0;
if( string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_read_to_buffer: invalid string.\n" );
return( -1 );
}
size *= EWF_CHAR_SIZE;
if( size > (size_t) SSIZE_MAX )
{
LIBEWF_WARNING_PRINT( "ewf_string_read_to_buffer: invalid size value exceeds maximum.\n" );
return( -1 );
}
count = libewf_common_read( file_descriptor, string, size );
if( count < (ssize_t) size )
{
LIBEWF_WARNING_PRINT( "ewf_string_read_to_buffer: unable to read string.\n" );
return( -1 );
}
return( count );
}
/* Writes the string to a file descriptor
* Returns the amount of bytes written on success, -1 on error
*/
ssize_t ewf_string_write_from_buffer( EWF_CHAR *string, int file_descriptor, size_t size )
{
ssize_t count = 0;
if( string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_write_from_buffer: invalid string.\n" );
return( -1 );
}
size *= EWF_CHAR_SIZE;
if( size > (size_t) SSIZE_MAX )
{
LIBEWF_WARNING_PRINT( "ewf_string_write_from_buffer: invalid size value exceeds maximum.\n" );
return( -1 );
}
count = libewf_common_write( file_descriptor, string, size );
if( count < (ssize_t) size )
{
LIBEWF_WARNING_PRINT( "ewf_string_write_from_buffer: unable to write string.\n" );
return( -1 );
}
return( count );
}
/* Reads a string from a file descriptor
* Returns a pointer to the new instance of the string, NULL on error
*/
EWF_CHAR *ewf_string_read( int file_descriptor, size_t size )
{
EWF_CHAR *string = NULL;
if( size > (size_t) SSIZE_MAX )
{
LIBEWF_WARNING_PRINT( "ewf_string_read: invalid size value exceeds maximum.\n" );
return( NULL );
}
string = (EWF_CHAR *) libewf_common_alloc( EWF_CHAR_SIZE * size );
if( string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_read: unable to allocate string.\n" );
return( NULL );
}
if( ewf_string_read_to_buffer( string, file_descriptor, size ) == -1 )
{
LIBEWF_WARNING_PRINT( "ewf_string_read: unable to read string.\n" );
libewf_common_free( string );
return( NULL );
}
return( string );
}
/* Reads a compressed string from a file descriptor and uncompresses it
* Returns a pointer to the new instance of the uncompressed string, NULL on error
*/
EWF_CHAR *ewf_string_read_compressed( int file_descriptor, size_t *size )
{
EWF_CHAR *uncompressed_string = NULL;
EWF_CHAR *compressed_string = NULL;
if( size == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_read_compressed: invalid size.\n" );
return( NULL );
}
compressed_string = ewf_string_read( file_descriptor, *size );
if( compressed_string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_read_compressed: unable to read compressed string.\n" );
return( NULL );
}
uncompressed_string = ewf_string_uncompress( compressed_string, size );
libewf_common_free( compressed_string );
if( uncompressed_string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_read_compressed: unable to uncompress string.\n" );
return( NULL );
}
return( uncompressed_string );
}
/* Writes an uncompressed string compressed to a file descriptor
* Returns the amount of bytes written on success, -1 on error
*/
ssize_t ewf_string_write_compressed( EWF_CHAR *uncompressed_string, int file_descriptor, size_t *size, int8_t compression_level )
{
EWF_CHAR *compressed_string = NULL;
ssize_t count = 0;
if( uncompressed_string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_write_compressed: invalid uncompressed string.\n" );
return( -1 );
}
if( size == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_write_compressed: invalid size.\n" );
return( -1 );
}
compressed_string = ewf_string_compress( uncompressed_string, size, compression_level );
if( compressed_string == NULL )
{
LIBEWF_WARNING_PRINT( "ewf_string_write_compressed: unable to compress string.\n" );
return( -1 );
}
count = ewf_string_write( compressed_string, file_descriptor, *size );
libewf_common_free( compressed_string );
return( count );
}
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