/* * EWF error2 section * * 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_endian.h"#include "libewf_notify.h"#include "ewf_crc.h"#include "ewf_error2.h"/* Reads the error2 from a file descriptor * Returns the amount of bytes read, or -1 on error */ssize_t ewf_error2_read( EWF_ERROR2 *error2, int file_descriptor ){	ssize_t count = 0;	size_t size   = EWF_ERROR2_SIZE;	if( error2 == NULL )	{		LIBEWF_WARNING_PRINT( "ewf_error2_read: invalid error2.\n" );		return( -1 );	}	count = libewf_common_read( file_descriptor, error2, size );	if( count < (ssize_t) size )	{		LIBEWF_WARNING_PRINT( "ewf_error2_read: unable to read error2.\n" );		return( -1 );	}	return( count );}/* Reads the ewf error2 sectors from a file descriptor * Returns the amount of bytes read, or -1 on error */ssize_t ewf_error2_sectors_read( EWF_ERROR2_SECTOR *sectors, int file_descriptor, uint32_t amount ){	ssize_t count = 0;	size_t size   = EWF_ERROR2_SECTOR_SIZE * amount;	if( sectors == NULL )	{		LIBEWF_WARNING_PRINT( "ewf_error2_sectors_read: invalid error2 sectors.\n" );		return( -1 );	}	if( size > (size_t) SSIZE_MAX )	{		LIBEWF_WARNING_PRINT( "ewf_error2_sectors_read: invalid amount exceeds maximum.\n" );		return( -1 );	}	count = libewf_common_read( file_descriptor, sectors, size );	if( count < (ssize_t) size )	{		LIBEWF_WARNING_PRINT( "ewf_error2_sectors_read: unable to read error2 sectors.\n" );		return( -1 );	}	return( count );}/* Writes the error2 to a file descriptor * Returns the amount of bytes written, or -1 on error */ssize_t ewf_error2_write( EWF_ERROR2 *error2, int file_descriptor ){	EWF_CRC crc   = 0;	ssize_t count = 0;	size_t size   = EWF_ERROR2_SIZE;	if( error2 == NULL )	{		LIBEWF_WARNING_PRINT( "ewf_error2_write: invalid error2.\n" );		return( -1 );	}	if( ewf_crc_calculate( &crc, (uint8_t *) error2, ( size - EWF_CRC_SIZE ), 1 ) != 1 )	{		LIBEWF_WARNING_PRINT( "ewf_error2_write: unable to calculate CRC.\n" );		return( -1 );	}	if( libewf_endian_revert_32bit( crc, error2->crc ) != 1 )	{		LIBEWF_WARNING_PRINT( "ewf_error2_write: unable to revert CRC value.\n" );		return( -1 );	}	count = libewf_common_write( file_descriptor, error2, size );	if( count < (ssize_t) size )	{		LIBEWF_WARNING_PRINT( "ewf_error2_write: unable to write error2.\n" );		return( -1 );	}	return( count );}/* Writes the sectors to a file descriptor * Returns the amount of bytes written, or -1 on error */ssize_t ewf_error2_sectors_write( EWF_ERROR2_SECTOR *sectors, int file_descriptor, uint32_t amount ){	EWF_CRC crc       = 0;	ssize_t count     = 0;	ssize_t crc_count = 0;	size_t size       = EWF_ERROR2_SECTOR_SIZE * amount;	if( sectors == NULL )	{		LIBEWF_WARNING_PRINT( "ewf_error2_sectors_write: invalid sectors.\n" );		return( -1 );	}	if( size > (size_t) SSIZE_MAX )	{		LIBEWF_WARNING_PRINT( "ewf_error2_sectors_write: invalid amount exceeds maximum.\n" );		return( -1 );	}	count = libewf_common_write( file_descriptor, sectors, size );	if( count < (ssize_t) size )	{		LIBEWF_WARNING_PRINT( "ewf_error2_sectors_write: unable write error2 sectors.\n" );		return( -1 );	}	if( ewf_crc_calculate( &crc, (uint8_t *) sectors, size, 1 ) != 1 )	{		LIBEWF_WARNING_PRINT( "ewf_error2_sectors_write: unable to calculate CRC.\n" );		return( -1 );	}	crc_count = ewf_crc_write( &crc, file_descriptor );	if( crc_count == -1 )	{		LIBEWF_WARNING_PRINT( "ewf_error2_sectors_write: unable to write CRC.\n" );		return( -1 );	}	return( count + crc_count );}