bitvec.c
/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
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/*
* bitvec.c -- Bit vector type.
*
* **********************************************
* CMU ARPA Speech Project
*
* Copyright (c) 1999 Carnegie Mellon University.
* ALL RIGHTS RESERVED.
* **********************************************
*
* HISTORY
* $Log: bitvec.c,v $
* Revision 1.4 2005/06/22 02:58:22 arthchan2003
* Added keyword
*
* Revision 1.3 2005/03/30 01:22:48 archan
* Fixed mistakes in last updates. Add
*
*
* 05-Mar-1999 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon
* Started.
*/
#include "sphinxbase/bitvec.h"
bitvec_t *
bitvec_realloc(bitvec_t *vec,
size_t old_len,
size_t new_len)
{
bitvec_t *new_vec;
size_t old_size = bitvec_size(old_len);
size_t new_size = bitvec_size(new_len);
new_vec = ckd_realloc(vec, new_size * sizeof(bitvec_t));
if (new_size > old_size)
memset(new_vec + old_size, 0, (new_size - old_size) * sizeof(bitvec_t));
return new_vec;
}
size_t
bitvec_count_set(bitvec_t *vec, size_t len)
{
size_t words, bits, w, b, n;
bitvec_t *v;
words = len / BITVEC_BITS;
bits = len % BITVEC_BITS;
v = vec;
n = 0;
for (w = 0; w < words; ++w, ++v) {
if (*v == 0)
continue;
for (b = 0; b < BITVEC_BITS; ++b)
if (*v & (1<<b))
++n;
}
for (b = 0; b < bits; ++b)
if (*v & (1<<b))
++n;
return n;
}
bitvec.h
An implementation of bit vectors.
bitvec_size
#define bitvec_size(n)
Number of bitvec_t in a bit vector.
Definition bitvec.h:70
bitvec_realloc
SPHINXBASE_EXPORT bitvec_t * bitvec_realloc(bitvec_t *vec, size_t old_len, size_t new_len)
Resize a bit vector, clear the remaining bits.
Definition bitvec.c:64
bitvec_count_set
SPHINXBASE_EXPORT size_t bitvec_count_set(bitvec_t *vec, size_t len)
Return the number of bits set in the given bitvector.
Definition bitvec.c:80
ckd_realloc
#define ckd_realloc(ptr, sz)
Macro for ckd_realloc.
Definition ckd_alloc.h:258