Vidalia  0.2.21
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