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- /*Copyright (C) 2008-2009 Timothy B. Terriberry (tterribe@xiph.org)
- You can redistribute this library and/or modify it under the terms of the
- GNU Lesser General Public License as published by the Free Software
- Foundation; either version 2.1 of the License, or (at your option) any later
- version.*/
- #if !defined(_qrcode_util_H)
- # define _qrcode_util_H (1)
- #include "stdio.h"
- #include "stdlib.h"
- #include "string.h"
- #include "bsp_common.h"
- #define QR_MAXI(_a,_b) ((_a)-((_a)-(_b)&-((_b)>(_a))))
- #define QR_MINI(_a,_b) ((_a)+((_b)-(_a)&-((_b)<(_a))))
- #define QR_SIGNI(_x) (((_x)>0)-((_x)<0))
- #define QR_SIGNMASK(_x) (-((_x)<0))
- /*Unlike copysign(), simply inverts the sign of _a if _b is negative.*/
- #define QR_FLIPSIGNI(_a,_b) ((_a)+QR_SIGNMASK(_b)^QR_SIGNMASK(_b))
- #define QR_COPYSIGNI(_a,_b) QR_FLIPSIGNI(abs(_a),_b)
- /*Divides a signed integer by a positive value with exact rounding.*/
- #define QR_DIVROUND(_x,_y) (((_x)+QR_FLIPSIGNI(_y>>1,_x))/(_y))
- #define QR_CLAMPI(_a,_b,_c) (QR_MAXI(_a,QR_MINI(_b,_c)))
- #define QR_CLAMP255(_x) ((unsigned char)((((_x)<0)-1)&((_x)|-((_x)>255))))
- /*Swaps two integers _a and _b if _a>_b.*/
- #define QR_SORT2I(_a,_b) \
- do{ \
- int t__; \
- t__=QR_MINI(_a,_b)^(_a); \
- (_a)^=t__; \
- (_b)^=t__; \
- } \
- while(0)
- #define QR_ILOG0(_v) (!!((_v)&0x2))
- #define QR_ILOG1(_v) (((_v)&0xC)?2+QR_ILOG0((_v)>>2):QR_ILOG0(_v))
- #define QR_ILOG2(_v) (((_v)&0xF0)?4+QR_ILOG1((_v)>>4):QR_ILOG1(_v))
- #define QR_ILOG3(_v) (((_v)&0xFF00)?8+QR_ILOG2((_v)>>8):QR_ILOG2(_v))
- #define QR_ILOG4(_v) (((_v)&0xFFFF0000)?16+QR_ILOG3((_v)>>16):QR_ILOG3(_v))
- /*Computes the integer logarithm of a (positive, 32-bit) constant.*/
- #define QR_ILOG(_v) ((int)QR_ILOG4((unsigned)(_v)))
- /*Multiplies 32-bit numbers _a and _b, adds (possibly 64-bit) number _r, and
- takes bits [_s,_s+31] of the result.*/
- #define QR_FIXMUL(_a,_b,_r,_s) ((int)((_a)*(long long)(_b)+(_r)>>(_s)))
- /*Multiplies 32-bit numbers _a and _b, adds (possibly 64-bit) number _r, and
- gives all 64 bits of the result.*/
- #define QR_EXTMUL(_a,_b,_r) ((_a)*(long long)(_b)+(_r))
- unsigned qr_isqrt(unsigned _val);
- unsigned qr_ihypot(int _x,int _y);
- int qr_ilog(unsigned _val);
- #endif
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