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Annotation of embedaddon/miniupnpd/minissdpd/codelength.h, revision 1.1.1.1

1.1       misho       1: /* $Id: codelength.h,v 1.5 2015/07/09 12:40:18 nanard Exp $ */
                      2: /* Project : miniupnp
                      3:  * Author : Thomas BERNARD
                      4:  * copyright (c) 2005-2015 Thomas Bernard
                      5:  * This software is subjet to the conditions detailed in the
                      6:  * provided LICENCE file. */
                      7: #ifndef CODELENGTH_H_INCLUDED
                      8: #define CODELENGTH_H_INCLUDED
                      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: 
                     14: /* n : unsigned
                     15:  * p : unsigned char *
                     16:  */
                     17: #define DECODELENGTH(n, p) n = 0; \
                     18:                            do { n = (n << 7) | (*p & 0x7f); } \
                     19:                            while((*(p++)&0x80) && (n<(1<<25)));
                     20: 
                     21: /* n :    unsigned
                     22:  * READ : function/macro to read one byte (unsigned char)
                     23:  */
                     24: #define DECODELENGTH_READ(n, READ) \
                     25:        n = 0; \
                     26:        do { \
                     27:                unsigned char c; \
                     28:                READ(c); \
                     29:                n = (n << 7) | (c & 0x07f); \
                     30:                if(!(c&0x80)) break; \
                     31:        } while(n<(1<<25));
                     32: 
                     33: /* n :       unsigned
                     34:  * p :       unsigned char *
                     35:  * p_limit : unsigned char *
                     36:  */
                     37: #define DECODELENGTH_CHECKLIMIT(n, p, p_limit) \
                     38:        n = 0; \
                     39:        do { \
                     40:                if((p) >= (p_limit)) break; \
                     41:                n = (n << 7) | (*(p) & 0x7f); \
                     42:        } while((*((p)++)&0x80) && (n<(1<<25)));
                     43: 
                     44: 
                     45: /* n : unsigned
                     46:  * p : unsigned char *
                     47:  */
                     48: #define CODELENGTH(n, p) if(n>=268435456) *(p++) = (n >> 28) | 0x80; \
                     49:                          if(n>=2097152) *(p++) = (n >> 21) | 0x80; \
                     50:                          if(n>=16384) *(p++) = (n >> 14) | 0x80; \
                     51:                          if(n>=128) *(p++) = (n >> 7) | 0x80; \
                     52:                          *(p++) = n & 0x7f;
                     53: 
                     54: #endif /* CODELENGTH_H_INCLUDED */