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