source: vbox/trunk/src/libs/liblzma-5.4.1/simple/simple_decoder.c

///////////////////////////////////////////////////////////////////////////////
//
/// \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, 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;
}