text: /*
   * Copyright (c) 1999-2000 Image Power, Inc. and the University of
   *   British Columbia.
   * Copyright (c) 2001-2002 Michael David Adams.
   * All rights reserved.
   */
  
  /* __START_OF_JASPER_LICENSE__
   * 
   * JasPer License Version 2.0
   * 
   * Copyright (c) 2001-2006 Michael David Adams
   * Copyright (c) 1999-2000 Image Power, Inc.
   * Copyright (c) 1999-2000 The University of British Columbia
   * 
   * All rights reserved.
   * 
   * Permission is hereby granted, free of charge, to any person (the
   * "User") obtaining a copy of this software and associated documentation
   * files (the "Software"), to deal in the Software without restriction,
   * including without limitation the rights to use, copy, modify, merge,
   * publish, distribute, and/or sell copies of the Software, and to permit
   * persons to whom the Software is furnished to do so, subject to the
   * following conditions:
   * 
   * 1.  The above copyright notices and this permission notice (which
   * includes the disclaimer below) shall be included in all copies or
   * substantial portions of the Software.
   * 
   * 2.  The name of a copyright holder shall not be used to endorse or
   * promote products derived from the Software without specific prior
   * written permission.
   * 
   * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
   * LICENSE.  NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
   * THIS DISCLAIMER.  THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
   * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
   * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
   * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.  IN NO
   * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
   * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
   * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
   * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
   * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.  NO ASSURANCES ARE
   * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
   * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
   * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
   * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
   * PROPERTY RIGHTS OR OTHERWISE.  AS A CONDITION TO EXERCISING THE RIGHTS
   * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
   * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY.  THE SOFTWARE
   * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
   * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
   * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
   * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
   * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
   * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
   * RISK ACTIVITIES").  THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
   * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
   * 
   * __END_OF_JASPER_LICENSE__
   */
  
  /*
   * Math-Related Code
   *
   * $Id$
   */
  
  #ifndef	JAS_MATH_H
  #define	JAS_MATH_H
  
  /******************************************************************************\
  * Includes
  \******************************************************************************/
  
  #include <jasper/jas_config.h>
  
  #include <assert.h>
  #include <stdio.h>
  #include <string.h>
  #include <stdbool.h>
  #include <stdint.h>
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /******************************************************************************\
  * Macros
  \******************************************************************************/
  
  /* Compute the absolute value. */
  #define	JAS_ABS(x) \
  	(((x) >= 0) ? (x) : (-(x)))
  
  /* Compute the minimum of two values. */
  #define	JAS_MIN(x, y) \
  	(((x) < (y)) ? (x) : (y))
  
  /* Compute the maximum of two values. */
  #define	JAS_MAX(x, y) \
  	(((x) > (y)) ? (x) : (y))
  
  /* Compute the remainder from division (where division is defined such
    that the remainder is always nonnegative). */
  #define	JAS_MOD(x, y) \
  	(((x) < 0) ? (((-x) % (y)) ? ((y) - ((-(x)) % (y))) : (0)) : ((x) % (y)))
  
  /* Compute the integer with the specified number of least significant bits
    set to one. */
  #define	JAS_ONES(n) \
    ((1 << (n)) - 1)
  
  /******************************************************************************\
  *
  \******************************************************************************/
  
  __attribute__ ((no_sanitize_undefined))
  inline static int jas_int_asr(int x, int n)
  {
  	assert(n >= 0);
  	// The behavior is undefined when x is negative. */
  	// We tacitly assume the behavior is equivalent to a signed
  	// arithmetic right shift.
  	return x >> n;
  }
  
  __attribute__ ((no_sanitize_undefined))
  inline static int jas_int_asl(int x, int n)
  {
  	assert(n >= 0);
  	// The behavior is undefined when x is negative. */
  	// We tacitly assume the behavior is equivalent to a signed
  	// arithmetic left shift.
  	return x << n;
  }
  
  __attribute__ ((no_sanitize_undefined))
  inline static int jas_fast32_asr(int_fast32_t x, int n)
  {
  	assert(n >= 0);
  	// The behavior is undefined when x is negative. */
  	// We tacitly assume the behavior is equivalent to a signed
  	// arithmetic right shift.
  	return x >> n;
  }
  
  __attribute__ ((no_sanitize_undefined))
  inline static int jas_fast32_asl(int_fast32_t x, int n)
  {
  	assert(n >= 0);
  	// The behavior is undefined when x is negative. */
  	// We tacitly assume the behavior is equivalent to a signed
  	// arithmetic left shift.
  	return x << n;
  }
  
  /******************************************************************************\
  * Safe integer arithmetic (i.e., with overflow checking).
  \******************************************************************************/
  
  /* Compute the product of two size_t integers with overflow checking. */
  inline static bool jas_safe_size_mul(size_t x, size_t y, size_t *result)
  {
  	/* Check if overflow would occur */
  	if (x && y > SIZE_MAX / x) {
  		/* Overflow would occur. */
  		return false;
  	}
  	*result = x * y;
  	return true;
  }
  
  /* Compute the sum of two size_t integer with overflow checking. */
  inline static bool jas_safe_size_add(size_t x, size_t y, size_t *result)
  {
  	if (y > SIZE_MAX - x) {
  		return false;
  	}
  	*result = x + y;
  	return true;
  }
  
  /* Compute the difference of two size_t integer with overflow checking. */
  inline static bool jas_safe_size_sub(size_t x, size_t y, size_t *result)
  {
  	if (y > x) {
  		return false;
  	}
  	*result = x - y;
  	return true;
  }
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  