tesseract-ocr/cutil/bitvec.h File Reference

#include "host.h"

Go to the source code of this file.

Defines
#define	BITSINLONG   32
#define	zero_all_bits(array, length)
#define	set_all_bits(array, length)
#define	copy_all_bits(source, dest, length)
#define	SET_BIT(array, bit)   (array[bit/BITSINLONG]|=1<<(bit&(BITSINLONG-1)))
#define	reset_bit(array, bit)   (array[bit/BITSINLONG]&=~(1<<(bit&(BITSINLONG-1))))
#define	test_bit(array, bit)   (array[bit/BITSINLONG] & (1<<(bit&(BITSINLONG-1))))
#define	WordsInVectorOfSize(NumBits)   (((NumBits) + BITSINLONG - 1) / BITSINLONG)
Typedefs
typedef uinT32 *	BIT_VECTOR
Functions
BIT_VECTOR	ExpandBitVector (BIT_VECTOR Vector, int NewNumBits)
void	FreeBitVector (BIT_VECTOR BitVector)
int	hamming_distance (uinT32 *array1, uinT32 *array2, int length)
BIT_VECTOR	NewBitVector (int NumBits)

---

Define Documentation

#define BITSINLONG   32

no of bits in a long

Definition at line 27 of file bitvec.h.

#define copy_all_bits	(		source,
			dest,
			length
	)

Value:

{\
    register int            index;                        /*temporary index*/\
\
for (index=0;index<length;index++)\
    dest[index]=source[index];                            /*copy all bits*/\
}

Definition at line 49 of file bitvec.h.

#define reset_bit	(		array,
			bit
	)		(array[bit/BITSINLONG]&=~(1<<(bit&(BITSINLONG-1))))

Definition at line 59 of file bitvec.h.

#define set_all_bits	(		array,
			length
	)

Value:

{\
    register int            index;                        /*temporary index*/\
\
for (index=0;index<length;index++)\
    array[index]= ~0;                                    /*set all bits*/\
}

Definition at line 41 of file bitvec.h.

#define SET_BIT	(		array,
			bit
	)		(array[bit/BITSINLONG]|=1<<(bit&(BITSINLONG-1)))

Definition at line 57 of file bitvec.h.

#define test_bit	(		array,
			bit
	)		(array[bit/BITSINLONG] & (1<<(bit&(BITSINLONG-1))))

Definition at line 61 of file bitvec.h.

#define WordsInVectorOfSize

(

NumBits

)

(((NumBits) + BITSINLONG - 1) / BITSINLONG)

Definition at line 63 of file bitvec.h.

#define zero_all_bits	(		array,
			length
	)

Value:

{\
    register int            index;                        /*temporary index*/\
\
for (index=0;index<length;index++)\
    array[index]=0;                                        /*zero all bits*/\
}

Definition at line 33 of file bitvec.h.

---

Typedef Documentation

typedef uinT32* BIT_VECTOR

Definition at line 28 of file bitvec.h.

---

Function Documentation

BIT_VECTOR ExpandBitVector	(	BIT_VECTOR	Vector,
		int	NewNumBits
	)

This routine uses realloc to increase the size of the specified bit vector.

Globals:

• none

Parameters:

Vector	bit vector to be expanded
NewNumBits	new size of bit vector

Returns:

New expanded bit vector.

Note:

Exceptions: none

History: Fri Nov 16 10:11:16 1990, DSJ, Created.

Definition at line 48 of file bitvec.cpp.

                                                              {
  return ((BIT_VECTOR) Erealloc(Vector,
    sizeof(Vector[0]) * WordsInVectorOfSize(NewNumBits)));
}                                /* ExpandBitVector */

void FreeBitVector

(

BIT_VECTOR

BitVector

)

This routine frees a bit vector. It also decrements the global counter that keeps track of the number of bit vectors allocated. If BitVector is NULL, then the count is printed to stderr.

Globals:

• BitVectorCount count of number of bit vectors allocated

Parameters:

BitVector

bit vector to be freed

Note:

Exceptions: none

History: Tue Oct 23 16:46:09 1990, DSJ, Created.

Definition at line 55 of file bitvec.cpp.

                                         {
  if (BitVector) {
    Efree(BitVector);
  }
}                                /* FreeBitVector */

int hamming_distance	(	uinT32 *	array1,
		uinT32 *	array2,
		int	length
	)

hamming_distance(array1,array2,length) computes the hamming distance between two bit strings.

Definition at line 81 of file bitvec.cpp.

                                                                 {
  register uinT32 diff;   /*bit difference */
  register int dist;             /*total distance */

  dist = 0;
  for (; length > 0; length--) {
    diff = *array1++ ^ *array2++;/*different bits */
    while (diff) {
      diff &= diff - 1;          /*lose a bit */
      dist++;
    }
  }
  return dist;                   /*total distance */
}

BIT_VECTOR NewBitVector

(

int

NumBits

)

Allocate and return a new bit vector large enough to hold the specified number of bits.

Globals:

• BitVectorCount number of bit vectors allocated

Parameters:

NumBits

number of bits in new bit vector

Returns:

New bit vector.

Note:

Exceptions: none

History: Tue Oct 23 16:51:27 1990, DSJ, Created.

Definition at line 111 of file bitvec.cpp.

                                     {
  return ((BIT_VECTOR) Emalloc(sizeof(uinT32) *
    WordsInVectorOfSize(NumBits)));
}                                /* NewBitVector */