SphinxBase  5prealpha
bitvec.c
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37 /*
38  * bitvec.c -- Bit vector type.
39  *
40  * **********************************************
41  * CMU ARPA Speech Project
42  *
43  * Copyright (c) 1999 Carnegie Mellon University.
44  * ALL RIGHTS RESERVED.
45  * **********************************************
46  *
47  * HISTORY
48  * $Log: bitvec.c,v $
49  * Revision 1.4 2005/06/22 02:58:22 arthchan2003
50  * Added keyword
51  *
52  * Revision 1.3 2005/03/30 01:22:48 archan
53  * Fixed mistakes in last updates. Add
54  *
55  *
56  * 05-Mar-1999 M K Ravishankar (rkm@cs.cmu.edu) at Carnegie Mellon
57  * Started.
58  */
59 
60 
61 #include "sphinxbase/bitvec.h"
62 
63 bitvec_t *
64 bitvec_realloc(bitvec_t *vec,
65  size_t old_len,
66  size_t new_len)
67 {
68  bitvec_t *new_vec;
69  size_t old_size = bitvec_size(old_len);
70  size_t new_size = bitvec_size(new_len);
71 
72  new_vec = ckd_realloc(vec, new_size * sizeof(bitvec_t));
73  if (new_size > old_size)
74  memset(new_vec + old_size, 0, (new_size - old_size) * sizeof(bitvec_t));
75 
76  return new_vec;
77 }
78 
79 size_t
80 bitvec_count_set(bitvec_t *vec, size_t len)
81 {
82  size_t words, bits, w, b, n;
83  bitvec_t *v;
84 
85  words = len / BITVEC_BITS;
86  bits = len % BITVEC_BITS;
87  v = vec;
88  n = 0;
89  for (w = 0; w < words; ++w, ++v) {
90  if (*v == 0)
91  continue;
92  for (b = 0; b < BITVEC_BITS; ++b)
93  if (*v & (1<<b))
94  ++n;
95  }
96  for (b = 0; b < bits; ++b)
97  if (*v & (1<<b))
98  ++n;
99 
100  return n;
101 }
#define bitvec_size(n)
Number of bitvec_t in a bit vector.
Definition: bitvec.h:70
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
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
#define ckd_realloc(ptr, sz)
Macro for ckd_realloc
Definition: ckd_alloc.h:258
An implementation of bit vectors.