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