source: vbox/trunk/src/libs/liblzma-5.4.1/common/filter_flags_encoder.c

///////////////////////////////////////////////////////////////////////////////
//
/// \file       filter_flags_encoder.c
/// \brief      Encodes a Filter Flags field
//
//  Author:     Lasse Collin
//
//  This file has been put into the public domain.
//  You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////

#include "filter_encoder.h"


extern LZMA_API(lzma_ret)
lzma_filter_flags_size(uint32_t *size, const lzma_filter *filter)
{
        if (filter->id >= LZMA_FILTER_RESERVED_START)
                return LZMA_PROG_ERROR;

        return_if_error(lzma_properties_size(size, filter));

        *size += lzma_vli_size(filter->id) + lzma_vli_size(*size);

        return LZMA_OK;
}


extern LZMA_API(lzma_ret)
lzma_filter_flags_encode(const lzma_filter *filter,
                uint8_t *out, size_t *out_pos, size_t out_size)
{
        // Filter ID
        if (filter->id >= LZMA_FILTER_RESERVED_START)
                return LZMA_PROG_ERROR;

        return_if_error(lzma_vli_encode(filter->id, NULL,
                        out, out_pos, out_size));

        // Size of Properties
        uint32_t props_size;
        return_if_error(lzma_properties_size(&props_size, filter));
        return_if_error(lzma_vli_encode(props_size, NULL,
                        out, out_pos, out_size));

        // Filter Properties
        if (out_size - *out_pos < props_size)
                return LZMA_PROG_ERROR;

        return_if_error(lzma_properties_encode(filter, out + *out_pos));

        *out_pos += props_size;

        return LZMA_OK;
}