src/liblzma/common/filter_flags_encoder.c

///////////////////////////////////////////////////////////////////////////////
//
/// \file       filter_flags_encoder.c
/// \brief      Decodes a Filter Flags field
//
//  Copyright (C) 2007 Lasse Collin
//
//  This library 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 2.1 of the License, or (at your option) any later version.
//
//  This library 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
//  Lesser General Public License for more details.
//
///////////////////////////////////////////////////////////////////////////////

#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;
}