1 /* 2 * Copyright (c) 2001-2002 Michael David Adams. 3 * All rights reserved. 4 */ 5 6 /* __START_OF_JASPER_LICENSE__ 7 * 8 * JasPer License Version 2.0 9 * 10 * Copyright (c) 2001-2006 Michael David Adams 11 * Copyright (c) 1999-2000 Image Power, Inc. 12 * Copyright (c) 1999-2000 The University of British Columbia 13 * 14 * All rights reserved. 15 * 16 * Permission is hereby granted, free of charge, to any person (the 17 * "User") obtaining a copy of this software and associated documentation 18 * files (the "Software"), to deal in the Software without restriction, 19 * including without limitation the rights to use, copy, modify, merge, 20 * publish, distribute, and/or sell copies of the Software, and to permit 21 * persons to whom the Software is furnished to do so, subject to the 22 * following conditions: 23 * 24 * 1. The above copyright notices and this permission notice (which 25 * includes the disclaimer below) shall be included in all copies or 26 * substantial portions of the Software. 27 * 28 * 2. The name of a copyright holder shall not be used to endorse or 29 * promote products derived from the Software without specific prior 30 * written permission. 31 * 32 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS 33 * LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER 34 * THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 35 * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 36 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 37 * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO 38 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL 39 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING 40 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, 41 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION 42 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE 43 * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE 44 * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY. 45 * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS 46 * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL 47 * PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS 48 * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE 49 * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE 50 * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL 51 * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES, 52 * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL 53 * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH 54 * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH, 55 * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH 56 * RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY 57 * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES. 58 * 59 * __END_OF_JASPER_LICENSE__ 60 */ 61 62 #ifndef JPC_MATH_H 63 #define JPC_MATH_H 64 65 /******************************************************************************\ 66 * Includes 67 \******************************************************************************/ 68 69 #include <assert.h> 70 71 /******************************************************************************\ 72 * Macros 73 \******************************************************************************/ 74 75 /* Compute the floor of the quotient of two integers. */ 76 #define JPC_FLOORDIV(x, y) ((x) / (y)) 77 78 /* Compute the ceiling of the quotient of two integers. */ 79 #define JPC_CEILDIV(x, y) (((x) + (y) - 1) / (y)) 80 81 /* Compute the floor of (x / 2^y). */ 82 #define JPC_FLOORDIVPOW2(x, y) ((x) >> (y)) 83 84 /* Compute the ceiling of (x / 2^y). */ 85 #define JPC_CEILDIVPOW2(x, y) (((x) + (1 << (y)) - 1) >> (y)) 86 87 /******************************************************************************\ 88 * Functions. 89 \******************************************************************************/ 90 91 /* Calculate the bit position of the first leading one in a nonnegative 92 integer. */ 93 int jpc_firstone(int x); 94 95 /* Calculate the integer quantity floor(log2(x)), where x is a positive 96 integer. */ 97 int jpc_floorlog2(int x); 98 99 #endif 100