/usr/include/tesseract/mod128.h is in libtesseract-dev 3.02.01-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* File: mod128.h (Formerly dir128.h)
* Description: Header for class which implements modulo arithmetic.
* Author: Ray Smith
* Created: Tue Mar 26 17:48:13 GMT 1991
*
* (C) Copyright 1991, Hewlett-Packard Ltd.
** 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 MOD128_H
#define MOD128_H
#include "points.h"
#define MODULUS 128 /*range of directions */
#define DIRBITS 7 //no of bits used
#define DIRSCALE 1000 //length of vector
class DLLSYM DIR128
{
public:
DIR128() {
} //empty constructor
DIR128( //constructor
inT16 value) { //value to assign
value %= MODULUS; //modulo arithmetic
if (value < 0)
value += MODULUS; //done properly
dir = (inT8) value;
}
DIR128(const FCOORD fc); //quantize vector
DIR128 & operator= ( //assign of inT16
inT16 value) { //value to assign
value %= MODULUS; //modulo arithmetic
if (value < 0)
value += MODULUS; //done properly
dir = (inT8) value;
return *this;
}
inT8 operator- ( //subtraction
const DIR128 & minus) const//for signed result
{
//result
inT16 result = dir - minus.dir;
if (result > MODULUS / 2)
result -= MODULUS; //get in range
else if (result < -MODULUS / 2)
result += MODULUS;
return (inT8) result;
}
DIR128 operator+ ( //addition
const DIR128 & add) const //of itself
{
DIR128 result; //sum
result = dir + add.dir; //let = do the work
return result;
}
DIR128 & operator+= ( //same as +
const DIR128 & add) {
*this = dir + add.dir; //let = do the work
return *this;
}
inT8 get_dir() const { //access function
return dir;
}
ICOORD vector() const; //turn to vector
private:
inT8 dir; //a direction
};
#endif
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