libewf_segment_table.c
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libewf_segment_table.c
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	/*
	* libewf segment table
	*
	* 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/libewf_definitions.h>

	#include "libewf_common.h"
	#include "libewf_notify.h"
	#include "libewf_segment_table.h"
	#include "libewf_string.h"

	/* Allocates memory for a segment table struct
	* Returns a pointer to the new instance, NULL on error
	*/
	LIBEWF_SEGMENT_TABLE *libewf_segment_table_alloc( uint16_t amount )
	{
	LIBEWF_SEGMENT_TABLE *segment_table = NULL;
	uint16_t iterator = 0;

	segment_table = (LIBEWF_SEGMENT_TABLE *) libewf_common_alloc( LIBEWF_SEGMENT_TABLE_SIZE );

	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_alloc: unable to allocate segment table.\n" );

	return( NULL );
	}
	#if defined( HAVE_WIDE_CHARACTER_TYPE ) && defined( HAVE_WIDE_CHARACTER_SUPPORT_FUNCTIONS )
	segment_table->filename = (wchar_t *) libewf_common_alloc_cleared( ( amount LIBEWF_SEGMENT_TABLE_FILENAME_SIZE ), 0 );
	#else
	segment_table->filename = (char *) libewf_common_alloc_cleared( ( amount LIBEWF_SEGMENT_TABLE_FILENAME_SIZE ), 0 );
	#endif

	if( segment_table->filename == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_alloc: unable to allocate filename array.\n" );

	libewf_common_free( segment_table );

	return( NULL );
	}
	segment_table->file_descriptor = (int ) libewf_common_alloc_cleared( ( amount LIBEWF_SEGMENT_TABLE_FILE_DESCRIPTOR_SIZE ), -1 );

	if( segment_table->file_descriptor == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_alloc: unable to allocate file descriptor array.\n" );

	libewf_common_free( segment_table->filename );
	libewf_common_free( segment_table );

	return( NULL );
	}
	segment_table->file_offset = (off_t ) libewf_common_alloc_cleared( ( amount LIBEWF_SEGMENT_TABLE_FILE_OFFSET_SIZE ), 0 );

	if( segment_table->file_offset == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_alloc: unable to allocate file offset array.\n" );

	libewf_common_free( segment_table->filename );
	libewf_common_free( segment_table->file_descriptor );
	libewf_common_free( segment_table );

	return( NULL );
	}
	segment_table->amount_of_chunks = (uint32_t ) libewf_common_alloc_cleared( ( amount LIBEWF_SEGMENT_TABLE_AMOUNT_OF_CHUNKS_SIZE ), 0 );

	if( segment_table->amount_of_chunks == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_alloc: unable to allocate amount of chunks array.\n" );

	libewf_common_free( segment_table->filename );
	libewf_common_free( segment_table->file_descriptor );
	libewf_common_free( segment_table->file_offset );
	libewf_common_free( segment_table );

	return( NULL );
	}
	segment_table->section_list = (LIBEWF_SECTION_LIST *) libewf_common_alloc_cleared( ( amount LIBEWF_SEGMENT_TABLE_SECTION_LIST_SIZE ), 0 );

	if( segment_table->section_list == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_alloc: unable to allocate section list array.\n" );

	libewf_common_free( segment_table->filename );
	libewf_common_free( segment_table->file_descriptor );
	libewf_common_free( segment_table->file_offset );
	libewf_common_free( segment_table->amount_of_chunks );
	libewf_common_free( segment_table );

	return( NULL );
	}
	for( iterator = 0; iterator < amount; iterator++ )
	{
	if( segment_table->section_list[ iterator ] == NULL )
	{
	segment_table->section_list[ iterator ] = (LIBEWF_SECTION_LIST *) libewf_common_alloc( LIBEWF_SECTION_LIST_SIZE );

	if( segment_table->section_list[ iterator ] == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_alloc: unable to allocate section list.\n" );

	/* The current entry does not need to be freed, because it was never allocated
	* but the first entry 0 does, because the iterator is a unsigned integer
	* the iterator - 1 construction is used
	* There are no entries in the list
	*/
	for( ; iterator > 0; iterator-- )
	{
	libewf_common_free( segment_table->section_list[ iterator - 1 ] );
	}
	libewf_common_free( segment_table->filename );
	libewf_common_free( segment_table->file_descriptor );
	libewf_common_free( segment_table->file_offset );
	libewf_common_free( segment_table->amount_of_chunks );
	libewf_common_free( segment_table->section_list );
	libewf_common_free( segment_table );

	return( NULL );
	}
	segment_table->section_list[ iterator ]->first = NULL;
	segment_table->section_list[ iterator ]->last = NULL;
	}
	else
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_alloc: section list already created.\n" );
	}
	}
	segment_table->amount = amount;

	return( segment_table );
	}

	/* Reallocates memory for the segment table
	* Returns a pointer to the instance, NULL on error
	*/
	LIBEWF_SEGMENT_TABLE libewf_segment_table_realloc( LIBEWF_SEGMENT_TABLE segment_table, uint16_t amount )
	{
	void *reallocation = NULL;
	uint16_t iterator = 0;

	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_realloc: invalid segment table.\n" );

	return( NULL );
	}
	reallocation = libewf_common_realloc_new_cleared( segment_table->filename, ( segment_table->amount * LIBEWF_SEGMENT_TABLE_FILENAME_SIZE ), ( amount * LIBEWF_SEGMENT_TABLE_FILENAME_SIZE ), 0 );

	if( reallocation == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_realloc: unable to reallocate dynamic filename array.\n" );

	return( NULL );
	}
	#if defined( HAVE_WIDE_CHARACTER_TYPE ) && defined( HAVE_WIDE_CHARACTER_SUPPORT_FUNCTIONS )
	segment_table->filename = (wchar_t **) reallocation;
	#else
	segment_table->filename = (char **) reallocation;
	#endif
	reallocation = libewf_common_realloc_new_cleared( segment_table->file_descriptor, ( segment_table->amount * LIBEWF_SEGMENT_TABLE_FILE_DESCRIPTOR_SIZE ), ( amount * LIBEWF_SEGMENT_TABLE_FILE_DESCRIPTOR_SIZE ), -1 );

	if( reallocation == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_realloc: unable to reallocate dynamic file descriptor array.\n" );

	return( NULL );
	}
	segment_table->file_descriptor = (int *) reallocation;
	reallocation = libewf_common_realloc_new_cleared( segment_table->file_offset, ( segment_table->amount * LIBEWF_SEGMENT_TABLE_FILE_OFFSET_SIZE ), ( amount * LIBEWF_SEGMENT_TABLE_FILE_OFFSET_SIZE ), 0 );

	if( reallocation == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_realloc: unable to reallocate dynamic file offset array.\n" );

	return( NULL );
	}
	segment_table->file_offset = (off_t *) reallocation;
	reallocation = libewf_common_realloc_new_cleared( segment_table->amount_of_chunks, ( segment_table->amount * LIBEWF_SEGMENT_TABLE_AMOUNT_OF_CHUNKS_SIZE ), ( amount * LIBEWF_SEGMENT_TABLE_AMOUNT_OF_CHUNKS_SIZE ), 0 );

	if( reallocation == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_realloc: unable to reallocate dynamic amount of chunks array.\n" );

	return( NULL );
	}
	segment_table->amount_of_chunks = (uint32_t *) reallocation;
	reallocation = libewf_common_realloc_new_cleared( segment_table->section_list, ( segment_table->amount * LIBEWF_SEGMENT_TABLE_SECTION_LIST_SIZE ), ( amount * LIBEWF_SEGMENT_TABLE_SECTION_LIST_SIZE ), 0 );

	if( reallocation == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_realloc: unable to reallocate dynamic section list array.\n" );

	return( NULL );
	}
	segment_table->section_list = (LIBEWF_SECTION_LIST **) reallocation;

	for( iterator = segment_table->amount; iterator < amount; iterator++ )
	{
	if( segment_table->section_list[ iterator ] == NULL )
	{
	segment_table->section_list[ iterator ] = (LIBEWF_SECTION_LIST *) libewf_common_alloc( LIBEWF_SECTION_LIST_SIZE );

	if( segment_table->section_list[ iterator ] == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_realloc: unable to allocate section list.\n" );

	return( NULL );
	}
	segment_table->section_list[ iterator ]->first = NULL;
	segment_table->section_list[ iterator ]->last = NULL;
	}
	else
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_realloc: section list already created.\n" );
	}
	}
	segment_table->amount = amount;

	return( segment_table );
	}

	/* Frees memory of a file list struct including elements
	*/
	void libewf_segment_table_free( LIBEWF_SEGMENT_TABLE *segment_table )
	{
	LIBEWF_SECTION_LIST_ENTRY *section_list_entry = NULL;
	LIBEWF_SECTION_LIST_ENTRY *current_section_list_entry = NULL;
	uint16_t iterator = 0;

	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_free: invalid segment table.\n" );

	return;
	}
	for( iterator = 0; iterator < segment_table->amount; iterator++ )
	{
	if( segment_table->filename[ iterator ] != NULL )
	{
	libewf_common_free( segment_table->filename[ iterator ] );
	}
	if( segment_table->section_list[ iterator ] != NULL )
	{
	section_list_entry = segment_table->section_list[ iterator ]->first;

	while( section_list_entry != NULL )
	{
	current_section_list_entry = section_list_entry;
	section_list_entry = section_list_entry->next;

	libewf_common_free( current_section_list_entry );
	}
	libewf_common_free( segment_table->section_list[ iterator ] );
	}
	}
	libewf_common_free( segment_table->filename );
	libewf_common_free( segment_table->file_descriptor );
	libewf_common_free( segment_table->file_offset );
	libewf_common_free( segment_table->amount_of_chunks );
	libewf_common_free( segment_table->section_list );
	libewf_common_free( segment_table );
	}

	/* Checks if a segment table entry is set
	* Returns 0 when entry is not set and 1 if set
	*/
	uint8_t libewf_segment_table_values_is_set( LIBEWF_SEGMENT_TABLE *segment_table, uint16_t segment )
	{
	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_values_is_set: invalid segment table.\n" );

	return( 0 );
	}
	if( segment > segment_table->amount )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_values_is_set: segment out of range.\n" );

	return( 0 );
	}
	return( (uint8_t) ( segment_table->filename[ segment ] != NULL ) );
	}

	#if defined( HAVE_WIDE_CHARACTER_TYPE ) && defined( HAVE_WIDE_CHARACTER_SUPPORT_FUNCTIONS )

	/* Gets a wide character filename of a certain segment
	* Returns the filename pointer, or NULL on error
	*/
	wchar_t libewf_segment_table_get_wide_filename( LIBEWF_SEGMENT_TABLE segment_table, uint16_t segment )
	{
	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_get_wide_filename: invalid segment table.\n" );

	return( NULL );
	}
	if( segment > segment_table->amount )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_get_wide_filename: segment out of range.\n" );

	return( NULL );
	}
	return( segment_table->filename[ segment ] );
	}
	#else

	/* Gets a filename of a certain segment
	* Returns the filename pointer, or NULL on error
	*/
	char libewf_segment_table_get_filename( LIBEWF_SEGMENT_TABLE segment_table, uint16_t segment )
	{
	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_get_filename: invalid segment table.\n" );

	return( NULL );
	}
	if( segment > segment_table->amount )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_get_filename: segment out of range.\n" );

	return( NULL );
	}
	return( segment_table->filename[ segment ] );
	}
	#endif

	/* Gets the file descriptor of a certain segment
	* Returns the file descriptor, or -1 on error
	*/
	int libewf_segment_table_get_file_descriptor( LIBEWF_SEGMENT_TABLE *segment_table, uint16_t segment )
	{
	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_get_file_descriptor: invalid segment table.\n" );

	return( -1 );
	}
	if( segment > segment_table->amount )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_get_file_descriptor: segment out of range.\n" );

	return( -1 );
	}
	return( segment_table->file_descriptor[ segment ] );
	}

	#if defined( HAVE_WIDE_CHARACTER_TYPE ) && defined( HAVE_WIDE_CHARACTER_SUPPORT_FUNCTIONS )

	/* Sets a wide character filename for a specific segment
	* Creates a duplicate of the string
	* Returns 1 if succesful, or -1 on error
	*/
	int8_t libewf_segment_table_set_wide_filename( LIBEWF_SEGMENT_TABLE segment_table, uint16_t segment, const wchar_t filename, size_t length_filename )
	{
	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_wide_filename: invalid segment table.\n" );

	return( -1 );
	}
	if( filename == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_wide_filename: invalid filename.\n" );

	return( -1 );
	}
	if( segment > segment_table->amount )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_wide_filename: segment out of range.\n" );

	return( -1 );
	}
	if( segment_table->filename[ segment ] != NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_wide_filename: duplicate segments not supported: segment %d in %s was already specified in %s.\n",
	segment, filename, segment_table->filename[ segment ] );

	return( -1 );
	}
	if( length_filename == 0 )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_wide_filename: unable to process empty filename.\n" );

	return( -1 );
	}
	if( length_filename >= (size_t) SSIZE_MAX )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_wide_filename: invalid filename length value exceeds maximum.\n" );

	return( -1 );
	}
	/* One additional byte for the end of string character is needed
	*/
	segment_table->filename[ segment ] = (wchar_t ) libewf_common_alloc( sizeof( wchar_t ) ( length_filename + 1 ) );

	if( segment_table->filename[ segment ] == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_wide_filename: unable to create filename.\n" );

	return( -1 );
	}
	if( libewf_common_wide_string_copy( segment_table->filename[ segment ], filename, length_filename ) == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_wide_filename: unable to set filename.\n" );

	libewf_common_free( segment_table->filename[ segment ] );

	segment_table->filename[ segment ] = NULL;

	return( -1 );
	}
	/* Make sure the string is terminated
	*/
	segment_table->filename[ segment ][ length_filename ] = '\0';

	return( 1 );
	}
	#else

	/* Sets a filename for a specific segment
	* Creates a duplicate of the string
	* Returns 1 if succesful, or -1 on error
	*/
	int8_t libewf_segment_table_set_filename( LIBEWF_SEGMENT_TABLE segment_table, uint16_t segment, const char filename, size_t length_filename )
	{
	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_filename: invalid segment table.\n" );

	return( -1 );
	}
	if( filename == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_filename: invalid filename.\n" );

	return( -1 );
	}
	if( segment > segment_table->amount )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_filename: segment out of range.\n" );

	return( -1 );
	}
	if( segment_table->filename[ segment ] != NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_filename: duplicate segments not supported: segment %d in %s was already specified in %s.\n", segment, filename, segment_table->filename[ segment ] );

	return( -1 );
	}
	if( length_filename == 0 )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_filename: unable to process empty filename.\n" );

	return( -1 );
	}
	if( length_filename >= (size_t) SSIZE_MAX )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_filename: invalid filename length value exceeds maximum.\n" );

	return( -1 );
	}
	/* One additional byte for the end of string character is needed
	*/
	segment_table->filename[ segment ] = (char ) libewf_common_alloc( sizeof( char ) ( length_filename + 1 ) );

	if( segment_table->filename[ segment ] == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_filename: unable to create filename.\n" );

	return( -1 );
	}
	if( libewf_common_string_copy( segment_table->filename[ segment ], filename, length_filename ) == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_filename: unable to set filename.\n" );

	libewf_common_free( segment_table->filename[ segment ] );

	segment_table->filename[ segment ] = NULL;

	return( -1 );
	}
	/* Make sure the string is terminated
	*/
	segment_table->filename[ segment ][ length_filename ] = '\0';

	return( 1 );
	}
	#endif

	/* Sets a file descriptor for a specific segment
	* Returns 1 if succesful, or -1 on error
	*/
	int8_t libewf_segment_table_set_file_descriptor( LIBEWF_SEGMENT_TABLE *segment_table, uint16_t segment, int file_descriptor )
	{
	if( segment_table == NULL )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_file_descriptor: invalid segment table.\n" );

	return( -1 );
	}
	if( segment > segment_table->amount )
	{
	LIBEWF_WARNING_PRINT( "libewf_segment_table_set_file_descriptor: segment out of range.\n" );

	return( -1 );
	}
	segment_table->file_descriptor[ segment ] = file_descriptor;

	return( 1 );
	}

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