tesseract 4.1.1
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helpers.h File Reference
#include <cassert>
#include <cstdio>
#include <cstring>
#include <functional>
#include <string>

Go to the source code of this file.

Classes

class  tesseract::TRand
 

Namespaces

namespace  tesseract
 

Functions

void chomp_string (char *str)
 
void SkipNewline (FILE *file)
 
template<typename T >
void Swap (T *p1, T *p2)
 
int RoundUp (int n, int block_size)
 
template<typename T >
ClipToRange (const T &x, const T &lower_bound, const T &upper_bound)
 
template<typename T1 , typename T2 >
void UpdateRange (const T1 &x, T2 *lower_bound, T2 *upper_bound)
 
template<typename T1 , typename T2 >
void UpdateRange (const T1 &x_lo, const T1 &x_hi, T2 *lower_bound, T2 *upper_bound)
 
template<typename T >
void IntersectRange (const T &lower1, const T &upper1, T *lower2, T *upper2)
 
int Modulo (int a, int b)
 
int DivRounded (int a, int b)
 
int IntCastRounded (double x)
 
int IntCastRounded (float x)
 
void ReverseN (void *ptr, int num_bytes)
 
void Reverse16 (void *ptr)
 
void Reverse32 (void *ptr)
 
void Reverse64 (void *ptr)
 

Function Documentation

◆ chomp_string()

void chomp_string ( char *  str)
inline

Definition at line 77 of file helpers.h.

77 {
78 int last_index = static_cast<int>(strlen(str)) - 1;
79 while (last_index >= 0 &&
80 (str[last_index] == '\n' || str[last_index] == '\r')) {
81 str[last_index--] = '\0';
82 }
83}

◆ ClipToRange()

template<typename T >
T ClipToRange ( const T &  x,
const T &  lower_bound,
const T &  upper_bound 
)
inline

Definition at line 108 of file helpers.h.

108 {
109 if (x < lower_bound) {
110 return lower_bound;
111 }
112 if (x > upper_bound) {
113 return upper_bound;
114 }
115 return x;
116}

◆ DivRounded()

int DivRounded ( int  a,
int  b 
)
inline

Definition at line 167 of file helpers.h.

167 {
168 if (b < 0) {
169 return -DivRounded(a, -b);
170 }
171 return a >= 0 ? (a + b / 2) / b : (a - b / 2) / b;
172}
int DivRounded(int a, int b)
Definition: helpers.h:167

◆ IntCastRounded() [1/2]

int IntCastRounded ( double  x)
inline

Definition at line 175 of file helpers.h.

175 {
176 return x >= 0.0 ? static_cast<int>(x + 0.5) : -static_cast<int>(-x + 0.5);
177}

◆ IntCastRounded() [2/2]

int IntCastRounded ( float  x)
inline

Definition at line 180 of file helpers.h.

180 {
181 return x >= 0.0F ? static_cast<int>(x + 0.5F) : -static_cast<int>(-x + 0.5F);
182}

◆ IntersectRange()

template<typename T >
void IntersectRange ( const T &  lower1,
const T &  upper1,
T *  lower2,
T *  upper2 
)
inline

Definition at line 145 of file helpers.h.

146 {
147 if (lower1 > *lower2) {
148 *lower2 = lower1;
149 }
150 if (upper1 < *upper2) {
151 *upper2 = upper1;
152 }
153}

◆ Modulo()

int Modulo ( int  a,
int  b 
)
inline

Definition at line 158 of file helpers.h.

158 {
159 return (a % b + b) % b;
160}

◆ Reverse16()

void Reverse16 ( void *  ptr)
inline

Definition at line 197 of file helpers.h.

197 {
198 ReverseN(ptr, 2);
199}
void ReverseN(void *ptr, int num_bytes)
Definition: helpers.h:185

◆ Reverse32()

void Reverse32 ( void *  ptr)
inline

Definition at line 202 of file helpers.h.

202 {
203 ReverseN(ptr, 4);
204}

◆ Reverse64()

void Reverse64 ( void *  ptr)
inline

Definition at line 207 of file helpers.h.

207 {
208 ReverseN(ptr, 8);
209}

◆ ReverseN()

void ReverseN ( void *  ptr,
int  num_bytes 
)
inline

Definition at line 185 of file helpers.h.

185 {
186 assert(num_bytes == 1 || num_bytes == 2 || num_bytes == 4 || num_bytes == 8);
187 char* cptr = static_cast<char*>(ptr);
188 int halfsize = num_bytes / 2;
189 for (int i = 0; i < halfsize; ++i) {
190 char tmp = cptr[i];
191 cptr[i] = cptr[num_bytes - 1 - i];
192 cptr[num_bytes - 1 - i] = tmp;
193 }
194}

◆ RoundUp()

int RoundUp ( int  n,
int  block_size 
)
inline

Definition at line 102 of file helpers.h.

102 {
103 return block_size * ((n + block_size - 1) / block_size);
104}

◆ SkipNewline()

void SkipNewline ( FILE *  file)
inline

Definition at line 86 of file helpers.h.

86 {
87 if (fgetc(file) != '\n') {
88 fseek(file, -1, SEEK_CUR);
89 }
90}

◆ Swap()

template<typename T >
void Swap ( T *  p1,
T *  p2 
)
inline

Definition at line 95 of file helpers.h.

95 {
96 T tmp(*p2);
97 *p2 = *p1;
98 *p1 = tmp;
99}

◆ UpdateRange() [1/2]

template<typename T1 , typename T2 >
void UpdateRange ( const T1 &  x,
T2 *  lower_bound,
T2 *  upper_bound 
)
inline

Definition at line 120 of file helpers.h.

120 {
121 if (x < *lower_bound) {
122 *lower_bound = x;
123 }
124 if (x > *upper_bound) {
125 *upper_bound = x;
126 }
127}

◆ UpdateRange() [2/2]

template<typename T1 , typename T2 >
void UpdateRange ( const T1 &  x_lo,
const T1 &  x_hi,
T2 *  lower_bound,
T2 *  upper_bound 
)
inline

Definition at line 131 of file helpers.h.

132 {
133 if (x_lo < *lower_bound) {
134 *lower_bound = x_lo;
135 }
136 if (x_hi > *upper_bound) {
137 *upper_bound = x_hi;
138 }
139}