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///////////////////////////////////////////////////////////////////////////////
//
/// \file       simple_decoder.c
/// \brief      Properties decoder for simple filters
//
//  Author:     Lasse Collin
//
//  This file has been put into the public domain.
//  You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////

#include "simple_decoder.h"


extern lzma_ret
lzma_simple_props_decode(void **options, 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 = unaligned_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;
}