151 lines
4.1 KiB
C
151 lines
4.1 KiB
C
/*
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* Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
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* Copyright (c) 2002-2007, Professor Benoit Macq
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* Copyright (c) 2001-2003, David Janssens
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* Copyright (c) 2002-2003, Yannick Verschueren
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* Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
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* Copyright (c) 2005, Herve Drolon, FreeImage Team
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __INT_H
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#define __INT_H
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/**
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@file int.h
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@brief Implementation of operations on integers (INT)
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The functions in INT.H have for goal to realize operations on integers.
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*/
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/** @defgroup INT INT - Implementation of operations on integers */
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/*@{*/
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/** @name Exported functions (see also openjpeg.h) */
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/*@{*/
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/* ----------------------------------------------------------------------- */
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#include <assert.h>
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#ifdef HAVE_STDINT_H
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#include <stdint.h>
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#else
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#if defined(_WIN32)
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typedef signed __int8 int8_t;
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typedef unsigned __int8 uint8_t;
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typedef signed __int16 int16_t;
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typedef unsigned __int16 uint16_t;
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typedef signed __int32 int32_t;
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typedef unsigned __int32 uint32_t;
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typedef signed __int64 int64_t;
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typedef unsigned __int64 uint64_t;
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#else
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#error unsupported platform
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#endif
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#endif
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/**
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Get the minimum of two integers
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@return Returns a if a < b else b
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*/
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static INLINE int int_min(int a, int b) {
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return a < b ? a : b;
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}
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/**
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Get the maximum of two integers
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@return Returns a if a > b else b
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*/
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static INLINE int int_max(int a, int b) {
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return (a > b) ? a : b;
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}
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/**
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Clamp an integer inside an interval
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@return
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<ul>
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<li>Returns a if (min < a < max)
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<li>Returns max if (a > max)
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<li>Returns min if (a < min)
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</ul>
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*/
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static INLINE int int_clamp(int a, int min, int max) {
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if (a < min)
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return min;
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if (a > max)
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return max;
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return a;
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}
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/**
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@return Get absolute value of integer
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*/
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static INLINE int int_abs(int a) {
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return a < 0 ? -a : a;
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}
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/**
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Divide an integer and round upwards
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@return Returns a divided by b
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*/
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static INLINE int int_ceildiv(int a, int b) {
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assert(b);
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return (a + b - 1) / b;
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}
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/**
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Divide an integer by a power of 2 and round upwards
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@return Returns a divided by 2^b
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*/
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static INLINE int int_ceildivpow2(int a, int b) {
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return (int)((a + ((int64_t)1 << b) - 1) >> b);
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}
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/**
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Divide a 64bits integer by a power of 2 and round upwards
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@return Returns a divided by 2^b
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*/
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static INLINE int int64_ceildivpow2(int64_t a, int b) {
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return (int)((a + ((int64_t)1 << b) - 1) >> b);
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}
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/**
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Divide an integer by a power of 2 and round downwards
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@return Returns a divided by 2^b
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*/
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static INLINE int int_floordivpow2(int a, int b) {
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return a >> b;
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}
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/**
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Get logarithm of an integer and round downwards
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@return Returns log2(a)
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*/
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static INLINE int int_floorlog2(int a) {
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int l;
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for (l = 0; a > 1; l++) {
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a >>= 1;
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}
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return l;
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}
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/* ----------------------------------------------------------------------- */
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/*@}*/
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/*@}*/
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#endif
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