/*

 * Cluster block data functions

 *

 * Copyright (C) 2021-2023, Joachim Metz <joachim.metz@gmail.com>

 *

 * Refer to AUTHORS for acknowledgements.

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with this program.  If not, see <https://www.gnu.org/licenses/>.

 */

#include <common.h>

#include <memory.h>

#include <types.h>

#include "libfsfat_cluster_block_data.h"

#include "libfsfat_libbfio.h"

#include "libfsfat_libcerror.h"

#include "libfsfat_libfdata.h"

#include "libfsfat_unused.h"

/* Reads data from the current offset into a buffer

 * Callback for the cluster block data stream

 * Returns the number of bytes read or -1 on error

 */

ssize_t libfsfat_cluster_block_data_read_segment_data(

         intptr_t *data_handle LIBFSFAT_ATTRIBUTE_UNUSED,

         libbfio_handle_t *file_io_handle,

         int segment_index LIBFSFAT_ATTRIBUTE_UNUSED,

         int segment_file_index LIBFSFAT_ATTRIBUTE_UNUSED,

         uint8_t *segment_data,

         size_t segment_data_size,

         uint32_t segment_flags LIBFSFAT_ATTRIBUTE_UNUSED,

         uint8_t read_flags LIBFSFAT_ATTRIBUTE_UNUSED,

         libcerror_error_t **error )

{

  static char *function = "libfsfat_cluster_block_data_read_segment_data";

  ssize_t read_count    = 0;

  LIBFSFAT_UNREFERENCED_PARAMETER( data_handle )

  LIBFSFAT_UNREFERENCED_PARAMETER( segment_index )

  LIBFSFAT_UNREFERENCED_PARAMETER( segment_file_index )

  LIBFSFAT_UNREFERENCED_PARAMETER( segment_flags )

  LIBFSFAT_UNREFERENCED_PARAMETER( read_flags )

  if( segment_data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid segment data.",

     function );

    return( -1 );

  }

  if( segment_data_size > (size_t) SSIZE_MAX )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_EXCEEDS_MAXIMUM,

     "%s: invalid segment data size value exceeds maximum.",

     function );

    return( -1 );

  }

  read_count = libbfio_handle_read_buffer(

                file_io_handle,

                segment_data,

                segment_data_size,

                error );

  if( read_count < 0 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_IO,

     LIBCERROR_IO_ERROR_READ_FAILED,

     "%s: unable to read segment data.",

     function );

    return( -1 );

  }

  return( read_count );

}

/* Seeks a certain offset of the data

 * Callback for the cluster block data stream

 * Returns the offset if seek is successful or -1 on error

 */

off64_t libfsfat_cluster_block_data_seek_segment_offset(

         intptr_t *data_handle LIBFSFAT_ATTRIBUTE_UNUSED,

         libbfio_handle_t *file_io_handle,

         int segment_index LIBFSFAT_ATTRIBUTE_UNUSED,

         int segment_file_index LIBFSFAT_ATTRIBUTE_UNUSED,

         off64_t segment_offset,

         libcerror_error_t **error )

{

  static char *function = "libfsfat_cluster_block_data_seek_segment_offset";

  LIBFSFAT_UNREFERENCED_PARAMETER( data_handle )

  LIBFSFAT_UNREFERENCED_PARAMETER( segment_index )

  LIBFSFAT_UNREFERENCED_PARAMETER( segment_file_index )

  if( segment_offset < 0 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,

     "%s: invalid segment offset value out of bounds.",

     function );

    return( -1 );

  }

  if( libbfio_handle_seek_offset(

       file_io_handle,

       segment_offset,

       SEEK_SET,

       error ) == -1 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_IO,

     LIBCERROR_IO_ERROR_SEEK_FAILED,

     "%s: unable to seek segment offset: %" PRIi64 " (0x%08" PRIx64 ").",

     function,

     segment_offset,

     segment_offset );

    return( -1 );

  }

  return( segment_offset );

}