Vidalia 0.3.1
codelength.h
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1/* $Id: codelength.h,v 1.1 2008/10/06 22:04:06 nanard Exp $ */
2/* Project : miniupnp
3 * Author : Thomas BERNARD
4 * copyright (c) 2005-2008 Thomas Bernard
5 * This software is subjet to the conditions detailed in the
6 * provided LICENCE file. */
7#ifndef __CODELENGTH_H__
8#define __CODELENGTH_H__
9
10/* Encode length by using 7bit per Byte :
11 * Most significant bit of each byte specifies that the
12 * following byte is part of the code */
13#define DECODELENGTH(n, p) n = 0; \
14 do { n = (n << 7) | (*p & 0x7f); } \
15 while(*(p++)&0x80);
16
17#define CODELENGTH(n, p) if(n>=268435456) *(p++) = (n >> 28) | 0x80; \
18 if(n>=2097152) *(p++) = (n >> 21) | 0x80; \
19 if(n>=16384) *(p++) = (n >> 14) | 0x80; \
20 if(n>=128) *(p++) = (n >> 7) | 0x80; \
21 *(p++) = n & 0x7f;
22
23#endif
24