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| 1 | /* $Id: codelength.h,v 1.1 2011/07/23 18:38:46 jmaggard Exp $ */ |
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| 2 | /* Project : miniupnp |
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| 3 | * Author : Thomas BERNARD |
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| 4 | * copyright (c) 2005-2008 Thomas Bernard |
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| 5 | * This software is subjet to the conditions detailed in the |
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| 6 | * provided LICENCE file. */ |
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| 7 | #ifndef __CODELENGTH_H__ |
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| 8 | #define __CODELENGTH_H__ |
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| 9 | |
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| 10 | /* Encode length by using 7bit per Byte : |
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| 11 | * Most significant bit of each byte specifies that the |
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| 12 | * following byte is part of the code */ |
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| 13 | #define DECODELENGTH(n, p) n = 0; \ |
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| 14 | do { n = (n << 7) | (*p & 0x7f); } \ |
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| 15 | while(*(p++)&0x80); |
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| 16 | |
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| 17 | #define CODELENGTH(n, p) if(n>=268435456) *(p++) = (n >> 28) | 0x80; \ |
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| 18 | if(n>=2097152) *(p++) = (n >> 21) | 0x80; \ |
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| 19 | if(n>=16384) *(p++) = (n >> 14) | 0x80; \ |
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| 20 | if(n>=128) *(p++) = (n >> 7) | 0x80; \ |
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| 21 | *(p++) = n & 0x7f; |
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| 22 | |
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| 23 | #endif |
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| 24 | |
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