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Annotation of embedaddon/miniupnpc/codelength.h, revision 1.1.1.2

1.1.1.2 ! misho       1: /* $Id: codelength.h,v 1.4 2012/09/27 15:40:29 nanard Exp $ */
1.1       misho       2: /* Project : miniupnp
                      3:  * Author : Thomas BERNARD
1.1.1.2 ! misho       4:  * copyright (c) 2005-2011 Thomas Bernard
1.1       misho       5:  * This software is subjet to the conditions detailed in the
                      6:  * provided LICENCE file. */
1.1.1.2 ! misho       7: #ifndef CODELENGTH_H_INCLUDED
        !             8: #define CODELENGTH_H_INCLUDED
1.1       misho       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); } \
1.1.1.2 ! misho      15:                            while((*(p++)&0x80) && (n<(1<<25)));
        !            16: 
        !            17: #define DECODELENGTH_CHECKLIMIT(n, p, p_limit) \
        !            18:        n = 0; \
        !            19:        do { \
        !            20:                if((p) >= (p_limit)) break; \
        !            21:                n = (n << 7) | (*(p) & 0x7f); \
        !            22:        } while((*((p)++)&0x80) && (n<(1<<25)));
1.1       misho      23: 
                     24: #define CODELENGTH(n, p) if(n>=268435456) *(p++) = (n >> 28) | 0x80; \
                     25:                          if(n>=2097152) *(p++) = (n >> 21) | 0x80; \
                     26:                          if(n>=16384) *(p++) = (n >> 14) | 0x80; \
                     27:                          if(n>=128) *(p++) = (n >> 7) | 0x80; \
                     28:                          *(p++) = n & 0x7f;
                     29: 
                     30: #endif
                     31: