/usr/include/tesseract/helpers.h is in libtesseract-dev 3.03.03-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 | /* -*-C-*-
********************************************************************************
*
* File: helpers.h
* Description: General utility functions
* Author: Daria Antonova
* Created: Wed Apr 8 14:37:00 2009
* Language: C++
* Package: N/A
* Status: Reusable Software Component
*
* (c) Copyright 2009, Google Inc.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*
********************************************************************************/
#ifndef TESSERACT_CCUTIL_HELPERS_H_
#define TESSERACT_CCUTIL_HELPERS_H_
#include <stdio.h>
#include <string.h>
// Remove newline (if any) at the end of the string.
inline void chomp_string(char *str) {
int last_index = strlen(str) - 1;
while (last_index >= 0 &&
(str[last_index] == '\n' || str[last_index] == '\r')) {
str[last_index--] = '\0';
}
}
// Advance the current pointer of the file if it points to a newline character.
inline void SkipNewline(FILE *file) {
if (fgetc(file) != '\n') fseek(file, -1, SEEK_CUR);
}
// Swaps the two args pointed to by the pointers.
// Operator= and copy constructor must work on T.
template<typename T> inline void Swap(T* p1, T* p2) {
T tmp(*p2);
*p2 = *p1;
*p1 = tmp;
}
// qsort function to sort 2 floats.
inline int sort_floats(const void *arg1, const void *arg2) {
float diff = *((float *) arg1) - *((float *) arg2);
if (diff > 0) {
return 1;
} else if (diff < 0) {
return -1;
} else {
return 0;
}
}
// return the smallest multiple of block_size greater than or equal to n.
inline int RoundUp(int n, int block_size) {
return block_size * ((n + block_size - 1) / block_size);
}
// Clip a numeric value to the interval [lower_bound, upper_bound].
template<typename T>
inline T ClipToRange(const T& x, const T& lower_bound, const T& upper_bound) {
if (x < lower_bound)
return lower_bound;
if (x > upper_bound)
return upper_bound;
return x;
}
// Extend the range [lower_bound, upper_bound] to include x.
template<typename T1, typename T2>
inline void UpdateRange(const T1& x, T2* lower_bound, T2* upper_bound) {
if (x < *lower_bound)
*lower_bound = x;
if (x > *upper_bound)
*upper_bound = x;
}
// Decrease lower_bound to be <= x_lo AND increase upper_bound to be >= x_hi.
template<typename T1, typename T2>
inline void UpdateRange(const T1& x_lo, const T1& x_hi,
T2* lower_bound, T2* upper_bound) {
if (x_lo < *lower_bound)
*lower_bound = x_lo;
if (x_hi > *upper_bound)
*upper_bound = x_hi;
}
// Intersect the range [*lower2, *upper2] with the range [lower1, upper1],
// putting the result back in [*lower2, *upper2].
// If non-intersecting ranges are given, we end up with *lower2 > *upper2.
template<typename T>
inline void IntersectRange(const T& lower1, const T& upper1,
T* lower2, T* upper2) {
if (lower1 > *lower2)
*lower2 = lower1;
if (upper1 < *upper2)
*upper2 = upper1;
}
// Proper modulo arithmetic operator. Returns a mod b that works for -ve a.
// For any integer a and positive b, returns r : 0<=r<b and a=n*b + r for
// some integer n.
inline int Modulo(int a, int b) {
return (a % b + b) % b;
}
// Integer division operator with rounding that works for negative input.
// Returns a divided by b, rounded to the nearest integer, without double
// counting at 0. With simple rounding 1/3 = 0, 0/3 = 0 -1/3 = 0, -2/3 = 0,
// -3/3 = 0 and -4/3 = -1.
// I want 1/3 = 0, 0/3 = 0, -1/3 = 0, -2/3 = -1, -3/3 = -1 and -4/3 = -1.
inline int DivRounded(int a, int b) {
if (b < 0) return -DivRounded(a, -b);
return a >= 0 ? (a + b / 2) / b : (a - b / 2) / b;
}
// Return a double cast to int with rounding.
inline int IntCastRounded(double x) {
return x >= 0.0 ? static_cast<int>(x + 0.5) : -static_cast<int>(-x + 0.5);
}
// Reverse the order of bytes in a n byte quantity for big/little-endian switch.
inline void ReverseN(void* ptr, int num_bytes) {
char *cptr = reinterpret_cast<char *>(ptr);
int halfsize = num_bytes / 2;
for (int i = 0; i < halfsize; ++i) {
char tmp = cptr[i];
cptr[i] = cptr[num_bytes - 1 - i];
cptr[num_bytes - 1 - i] = tmp;
}
}
// Reverse the order of bytes in a 16 bit quantity for big/little-endian switch.
inline void Reverse16(void *ptr) {
ReverseN(ptr, 2);
}
// Reverse the order of bytes in a 32 bit quantity for big/little-endian switch.
inline void Reverse32(void *ptr) {
ReverseN(ptr, 4);
}
// Reverse the order of bytes in a 64 bit quantity for big/little-endian switch.
inline void Reverse64(void* ptr) {
ReverseN(ptr, 8);
}
#endif // TESSERACT_CCUTIL_HELPERS_H_
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