/* Retrieves the chunk data of a chunk at a specific offset
* Adds a checksum error if the data is corrupted
* Returns 1 if successful or -1 on error
*/
int libewf_chunk_table_get_chunk_data_by_offset(
libewf_chunk_table_t *chunk_table,
uint64_t chunk_index,
libewf_io_handle_t *io_handle,
libbfio_pool_t *file_io_pool,
libewf_media_values_t *media_values,
libewf_segment_table_t *segment_table,
libfdata_range_list_t *delta_chunks_range_list,
libfcache_cache_t *chunk_groups_cache,
libfcache_cache_t *chunks_cache,
off64_t offset,
libewf_chunk_data_t **chunk_data,
off64_t *chunk_data_offset,
libcerror_error_t **error )
{
libewf_segment_file_t *segment_file = NULL;
libfdata_list_t *chunks_list = NULL;
static char *function = "libewf_chunk_table_get_chunk_data_by_offset";
off64_t chunk_offset = 0;
off64_t chunk_group_data_offset = 0;
off64_t segment_file_data_offset = 0;
size_t chunk_data_size = 0;
uint64_t start_sector = 0;
uint64_t number_of_sectors = 0;
uint32_t segment_number = 0;
int chunk_groups_list_index = 0;
int chunks_list_index = 0;
int result = 0;
if( chunk_table == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid chunk table.",
function );
return( -1 );
}
if( io_handle == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid IO handle.",
function );
return( -1 );
}
if( media_values == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid media values.",
function );
return( -1 );
}
if( chunk_data == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid chunk data.",
function );
return( -1 );
}
if( chunk_data_offset == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid chunk data offset.",
function );
return( -1 );
}
if( delta_chunks_range_list != NULL )
{
result = libfdata_range_list_get_element_value_at_offset(
delta_chunks_range_list,
(intptr_t *) file_io_pool,
chunks_cache,
offset,
chunk_data_offset,
(intptr_t **) chunk_data,
0,
error );
if( result == -1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_GET_FAILED,
"%s: unable to retrieve chunk: %" PRIu64 " from delta chunks range list.",
function,
chunk_index );
return( -1 );
}
}
if( result == 0 )
{
result = libewf_chunk_table_get_segment_file_chunk_group_by_offset(
chunk_table,
file_io_pool,
segment_table,
chunk_groups_cache,
offset,
&segment_number,
&segment_file_data_offset,
&segment_file,
&chunk_groups_list_index,
&chunk_group_data_offset,
&chunks_list,
error );
if( result == -1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_GET_FAILED,
"%s: unable to retrieve segment file chunk group at offset: %" PRIi64 ".",
function,
offset );
return( -1 );
}
if( result != 0 )
{
if( chunks_list == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_VALUE_MISSING,
"%s: missing chunks list: %d.",
function,
chunk_groups_list_index );
return( -1 );
}
result = libfdata_list_get_element_value_at_offset(
chunks_list,
(intptr_t *) file_io_pool,
chunks_cache,
chunk_group_data_offset,
&chunks_list_index,
chunk_data_offset,
(intptr_t **) chunk_data,
0,
error );
if( result == -1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_GET_FAILED,
"%s: unable to retrieve chunk: %" PRIu64 " data from chunk group: %d in segment file: %" PRIu32 " at offset: %" PRIi64 ".",
function,
chunk_index,
chunk_groups_list_index,
segment_number,
segment_file_data_offset );
return( -1 );
}
}
}
if( result != 0 )
{
if( *chunk_data == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_VALUE_MISSING,
"%s: missing chunk: %" PRIu64 " data.",
function,
chunk_index );
return( -1 );
}
if( libewf_chunk_data_unpack(
*chunk_data,
media_values->chunk_size,
io_handle->compression_method,
error ) != 1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_GENERIC,
"%s: unable to unpack chunk: %" PRIu64 " data.",
function,
chunk_index );
return( -1 );
}
if( ( ( *chunk_data )->range_flags & LIBEWF_RANGE_FLAG_IS_CORRUPTED ) != 0 )
{
if( io_handle->zero_on_error != 0 )
{
if( memory_set(
( *chunk_data )->data,
0,
( *chunk_data )->data_size ) == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_MEMORY,
LIBCERROR_MEMORY_ERROR_SET_FAILED,
"%s: unable to zero chunk: %" PRIu64 " data.",
function,
chunk_index );
return( -1 );
}
}
chunk_offset = offset - *chunk_data_offset;
}
}
else
{
chunk_offset = (off64_t) chunk_index * media_values->chunk_size;
chunk_data_size = media_values->chunk_size;
if( (size64_t) ( chunk_offset + chunk_data_size ) > media_values->media_size )
{
chunk_data_size = (size_t) ( media_values->media_size - chunk_offset );
}
if( libewf_chunk_data_initialize_clear_data(
chunk_data,
chunk_data_size,
error ) != 1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_INITIALIZE_FAILED,
"%s: unable to create chunk: %" PRIu64 " data.",
function,
chunk_index );
return( -1 );
}
if( *chunk_data == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_VALUE_MISSING,
"%s: missing chunk data: %" PRIu64 ".",
function,
chunk_index );
return( -1 );
}
( *chunk_data )->data_size = chunk_data_size;
( *chunk_data )->range_flags |= LIBEWF_RANGE_FLAG_IS_CORRUPTED;
}
if( ( ( *chunk_data )->range_flags & LIBEWF_RANGE_FLAG_IS_CORRUPTED ) != 0 )
{
/* Add checksum error
*/
start_sector = chunk_offset / media_values->bytes_per_sector;
number_of_sectors = media_values->sectors_per_chunk;
if( ( start_sector + number_of_sectors ) > (uint64_t) media_values->number_of_sectors )
{
number_of_sectors = (uint64_t) media_values->number_of_sectors - start_sector;
}
if( libcdata_range_list_insert_range(
chunk_table->checksum_errors,
start_sector,
number_of_sectors,
NULL,
NULL,
NULL,
error ) != 1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_APPEND_FAILED,
"%s: unable to insert checksum error in range list.",
function );
return( -1 );
}
}
return( 1 );
}
/* Reads a buffer from the data chunk
* It applies decompression if necessary and validates the chunk checksum
* This function should be used after libewf_handle_read_data_chunk
* Returns the number of bytes read, 0 when no longer data can be read or -1 on error
*/
ssize_t libewf_data_chunk_read_buffer(
libewf_data_chunk_t *data_chunk,
void *buffer,
size_t buffer_size,
libcerror_error_t **error )
{
libewf_internal_data_chunk_t *internal_data_chunk = NULL;
static char *function = "libewf_data_chunk_read_buffer";
ssize_t read_count = 0;
if( data_chunk == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_ARGUMENTS,
LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,
"%s: invalid data chunk.",
function );
return( -1 );
}
internal_data_chunk = (libewf_internal_data_chunk_t *) data_chunk;
if( internal_data_chunk->chunk_data == NULL )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_VALUE_MISSING,
"%s: invalid data chunk - missing chunk data.",
function );
return( -1 );
}
#if defined( HAVE_LIBEWF_MULTI_THREAD_SUPPORT )
if( libcthreads_read_write_lock_grab_for_write(
internal_data_chunk->read_write_lock,
error ) != 1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_SET_FAILED,
"%s: unable to grab read/write lock for writing.",
function );
return( -1 );
}
#endif
if( ( internal_data_chunk->chunk_data->range_flags & LIBEWF_RANGE_FLAG_IS_PACKED ) != 0 )
{
/* TODO optimize to unpack directly to buffer */
if( libewf_chunk_data_unpack(
internal_data_chunk->chunk_data,
internal_data_chunk->io_handle,
error ) != 1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_GENERIC,
"%s: unable to unpack chunk: %" PRIu64 " data.",
function,
internal_data_chunk->chunk_index );
goto on_error;
}
}
read_count = libewf_chunk_data_read_buffer(
internal_data_chunk->chunk_data,
buffer,
buffer_size,
error );
if( read_count < 0 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_IO,
LIBCERROR_IO_ERROR_READ_FAILED,
"%s: unable to read chunk: %" PRIu64 " data.",
function,
internal_data_chunk->chunk_index );
goto on_error;
}
#if defined( HAVE_LIBEWF_MULTI_THREAD_SUPPORT )
if( libcthreads_read_write_lock_release_for_write(
internal_data_chunk->read_write_lock,
error ) != 1 )
{
libcerror_error_set(
error,
LIBCERROR_ERROR_DOMAIN_RUNTIME,
LIBCERROR_RUNTIME_ERROR_SET_FAILED,
"%s: unable to release read/write lock for writing.",
function );
return( -1 );
}
#endif
return( read_count );
on_error:
#if defined( HAVE_LIBEWF_MULTI_THREAD_SUPPORT )
libcthreads_read_write_lock_release_for_write(
internal_data_chunk->read_write_lock,
NULL );
#endif
return( -1 );
}
