xz-archive/src/liblzma/common/vli_size.c

///////////////////////////////////////////////////////////////////////////////
//
/// \file       vli_size.c
/// \brief      Calculates the encoded size of a variable-length integer
//
//  Copyright (C) 2007-2008 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 "common.h"


extern LZMA_API uint32_t
lzma_vli_size(lzma_vli vli)
{
	if (vli > LZMA_VLI_MAX)
		return 0;

	uint32_t i = 0;
	do {
		vli >>= 7;
		++i;
	} while (vli != 0);

	assert(i <= LZMA_VLI_BYTES_MAX);
	return i;
}