/*

 * The compressed data header functions

 *

 * Copyright (C) 2018-2026, 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 <byte_stream.h>

#include <memory.h>

#include <types.h>

#include "libfsapfs_compressed_data_header.h"

#include "libfsapfs_libcerror.h"

#include "libfsapfs_libcnotify.h"

#include "fsapfs_compressed_data.h"

/* Creates compressed data header

 * Make sure the value compressed_data_header is referencing, is set to NULL

 * Returns 1 if successful or -1 on error

 */

int libfsapfs_compressed_data_header_initialize(

     libfsapfs_compressed_data_header_t **compressed_data_header,

     libcerror_error_t **error )

{

  static char *function = "libfsapfs_compressed_data_header_initialize";

  if( compressed_data_header == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid compressed data header.",

     function );

    return( -1 );

  }

  if( *compressed_data_header != NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_ALREADY_SET,

     "%s: invalid compressed data header value already set.",

     function );

    return( -1 );

  }

  *compressed_data_header = memory_allocate_structure(

                             libfsapfs_compressed_data_header_t );

  if( *compressed_data_header == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_INSUFFICIENT,

     "%s: unable to create compressed data header.",

     function );

    goto on_error;

  }

  if( memory_set(

       *compressed_data_header,

       0,

       sizeof( libfsapfs_compressed_data_header_t ) ) == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_MEMORY,

     LIBCERROR_MEMORY_ERROR_SET_FAILED,

     "%s: unable to clear compressed data header.",

     function );

    goto on_error;

  }

  return( 1 );

on_error:

  if( *compressed_data_header != NULL )

  {

    memory_free(

     *compressed_data_header );

    *compressed_data_header = NULL;

  }

  return( -1 );

}

/* Frees compressed data header

 * Returns 1 if successful or -1 on error

 */

int libfsapfs_compressed_data_header_free(

     libfsapfs_compressed_data_header_t **compressed_data_header,

     libcerror_error_t **error )

{

  static char *function = "libfsapfs_compressed_data_header_free";

  if( compressed_data_header == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid compressed data header.",

     function );

    return( -1 );

  }

  if( *compressed_data_header != NULL )

  {

    memory_free(

     *compressed_data_header );

    *compressed_data_header = NULL;

  }

  return( 1 );

}

/* Reads the compressed data header

 * Returns 1 if successful, 0 if the signature does not match or -1 on error

 */

int libfsapfs_compressed_data_header_read_data(

     libfsapfs_compressed_data_header_t *compressed_data_header,

     const uint8_t *data,

     size_t data_size,

     libcerror_error_t **error )

{

  static char *function = "libfsapfs_compressed_data_header_read_data";

  if( compressed_data_header == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_ARGUMENTS,

     LIBCERROR_ARGUMENT_ERROR_INVALID_VALUE,

     "%s: invalid compressed data header.",

     function );

    return( -1 );

  }

  if( data == NULL )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_MISSING,

     "%s: invalid data.",

     function );

    return( -1 );

  }

  if( ( data_size < sizeof( fsapfs_compressed_data_header_t ) )

   || ( data_size > (size_t) SSIZE_MAX ) )

  {

    libcerror_error_set(

     error,

     LIBCERROR_ERROR_DOMAIN_RUNTIME,

     LIBCERROR_RUNTIME_ERROR_VALUE_OUT_OF_BOUNDS,

     "%s: invalid data size value out of bounds.",

     function );

    return( -1 );

  }

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: compressed data header data:\n",

     function );

    libcnotify_print_data(

     data,

     sizeof( fsapfs_compressed_data_header_t ),

     LIBCNOTIFY_PRINT_DATA_FLAG_GROUP_DATA );

  }

#endif

  if( memory_compare(

       ( (fsapfs_compressed_data_header_t *) data )->signature,

       "fpmc",

       4 ) != 0 )

  {

    return( 0 );

  }

  byte_stream_copy_to_uint32_little_endian(

   ( (fsapfs_compressed_data_header_t *) data )->compression_method,

   compressed_data_header->compression_method );

  byte_stream_copy_to_uint64_little_endian(

   ( (fsapfs_compressed_data_header_t *) data )->uncompressed_data_size,

   compressed_data_header->uncompressed_data_size );

#if defined( HAVE_DEBUG_OUTPUT )

  if( libcnotify_verbose != 0 )

  {

    libcnotify_printf(

     "%s: signature\t\t\t: %c%c%c%c\n",

     function,

     ( (fsapfs_compressed_data_header_t *) data )->signature[ 0 ],

     ( (fsapfs_compressed_data_header_t *) data )->signature[ 1 ],

     ( (fsapfs_compressed_data_header_t *) data )->signature[ 2 ],

     ( (fsapfs_compressed_data_header_t *) data )->signature[ 3 ] );

    libcnotify_printf(

     "%s: compression method\t\t: %" PRIu32 "\n",

     function,

     compressed_data_header->compression_method );

    libcnotify_printf(

     "%s: uncompressed data size\t: %" PRIu64 "\n",

     function,

     compressed_data_header->uncompressed_data_size );

    libcnotify_printf(

     "\n" );

  }

#endif /* defined( HAVE_DEBUG_OUTPUT ) */

  return( 1 );

}