// SPDX-License-Identifier: 0BSD

///////////////////////////////////////////////////////////////////////////////

//

/// \file       simple_decoder.c

/// \brief      Properties decoder for simple filters

//

//  Author:     Lasse Collin

//

///////////////////////////////////////////////////////////////////////////////

#include "simple_decoder.h"

extern lzma_ret

lzma_simple_props_decode(void **options, const lzma_allocator *allocator,

    const uint8_t *props, size_t props_size)

{

  if (props_size == 0)

    return LZMA_OK;

  if (props_size != 4)

    return LZMA_OPTIONS_ERROR;

  lzma_options_bcj *opt = lzma_alloc(

      sizeof(lzma_options_bcj), allocator);

  if (opt == NULL)

    return LZMA_MEM_ERROR;

  opt->start_offset = read32le(props);

  // Don't leave an options structure allocated if start_offset is zero.

  if (opt->start_offset == 0)

    lzma_free(opt, allocator);

  else

    *options = opt;

  return LZMA_OK;

}