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Diffstat (limited to 'thirdparty/miniupnpc/src/codelength.h')
| -rw-r--r-- | thirdparty/miniupnpc/src/codelength.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/thirdparty/miniupnpc/src/codelength.h b/thirdparty/miniupnpc/src/codelength.h new file mode 100644 index 0000000000..ea0b005ffe --- /dev/null +++ b/thirdparty/miniupnpc/src/codelength.h @@ -0,0 +1,54 @@ +/* $Id: codelength.h,v 1.3 2011/07/30 13:10:05 nanard Exp $ */ +/* Project : miniupnp + * Author : Thomas BERNARD + * copyright (c) 2005-2015 Thomas Bernard + * This software is subjet to the conditions detailed in the + * provided LICENCE file. */ +#ifndef CODELENGTH_H_INCLUDED +#define CODELENGTH_H_INCLUDED + +/* Encode length by using 7bit per Byte : + * Most significant bit of each byte specifies that the + * following byte is part of the code */ + +/* n : unsigned + * p : unsigned char * + */ +#define DECODELENGTH(n, p) n = 0; \ + do { n = (n << 7) | (*p & 0x7f); } \ + while((*(p++)&0x80) && (n<(1<<25))); + +/* n : unsigned + * READ : function/macro to read one byte (unsigned char) + */ +#define DECODELENGTH_READ(n, READ) \ + n = 0; \ + do { \ + unsigned char c; \ + READ(c); \ + n = (n << 7) | (c & 0x07f); \ + if(!(c&0x80)) break; \ + } while(n<(1<<25)); + +/* n : unsigned + * p : unsigned char * + * p_limit : unsigned char * + */ +#define DECODELENGTH_CHECKLIMIT(n, p, p_limit) \ + n = 0; \ + do { \ + if((p) >= (p_limit)) break; \ + n = (n << 7) | (*(p) & 0x7f); \ + } while((*((p)++)&0x80) && (n<(1<<25))); + + +/* n : unsigned + * p : unsigned char * + */ +#define CODELENGTH(n, p) if(n>=268435456) *(p++) = (n >> 28) | 0x80; \ + if(n>=2097152) *(p++) = (n >> 21) | 0x80; \ + if(n>=16384) *(p++) = (n >> 14) | 0x80; \ + if(n>=128) *(p++) = (n >> 7) | 0x80; \ + *(p++) = n & 0x7f; + +#endif /* CODELENGTH_H_INCLUDED */ |