/*

 * Block data handle functions

 *

 * Copyright (C) 2010-2024, 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 "libfsext_block_data_handle.h"

#include "libfsext_libbfio.h"

#include "libfsext_libcerror.h"

#include "libfsext_libfdata.h"

#include "libfsext_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 libfsext_block_data_handle_read_segment_data(

         intptr_t *data_handle LIBFSEXT_ATTRIBUTE_UNUSED,

         libbfio_handle_t *file_io_handle,

         int segment_index,

         int segment_file_index LIBFSEXT_ATTRIBUTE_UNUSED,

         uint8_t *segment_data,

         size_t segment_data_size,

         uint32_t segment_flags,

         uint8_t read_flags LIBFSEXT_ATTRIBUTE_UNUSED,

         libcerror_error_t **error )

{

  static char *function = "libfsext_block_data_handle_read_segment_data";

  ssize_t read_count    = 0;

  LIBFSEXT_UNREFERENCED_PARAMETER( data_handle )

  LIBFSEXT_UNREFERENCED_PARAMETER( segment_file_index )

  LIBFSEXT_UNREFERENCED_PARAMETER( read_flags )

  if( segment_index < 0 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,

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

     function );

    return( -1 );

  }

  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 );

  }

  if( ( segment_flags & LIBFDATA_RANGE_FLAG_IS_SPARSE ) != 0 )

  {

    if( memory_set(

         segment_data,

         0,

         segment_data_size ) == NULL )

    {

      libcerror_error_set(

       error,

       LIBCERROR_ERROR_DOMAIN_MEMORY,

       LIBCERROR_MEMORY_ERROR_SET_FAILED,

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

       function );

      return( -1 );

    }

    read_count = (ssize_t) segment_data_size;

  }

  else

  {

    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 libfsext_block_data_handle_seek_segment_offset(

         intptr_t *data_handle LIBFSEXT_ATTRIBUTE_UNUSED,

         libbfio_handle_t *file_io_handle,

         int segment_index,

         int segment_file_index LIBFSEXT_ATTRIBUTE_UNUSED,

         off64_t segment_offset,

         libcerror_error_t **error )

{

  static char *function = "libfsext_block_data_handle_seek_segment_offset";

  LIBFSEXT_UNREFERENCED_PARAMETER( data_handle )

  LIBFSEXT_UNREFERENCED_PARAMETER( segment_file_index )

  if( segment_index < 0 )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_VALUE_OUT_OF_BOUNDS,

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

     function );

    return( -1 );

  }

  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 );

}