1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/*
** BITFILES.C - reading/writing bit files
**
** Public domain by Aare Tali
*/
#include <stdio.h>
#include <stdlib.h>
typedef struct {
FILE * file; /* for stream I/O */
char rbuf; /* read bit buffer */
char rcnt; /* read bit count */
char wbuf; /* write bit buffer */
char wcnt; /* write bit count */
} bfile;
bfile *bfopen(char *name, char *mode)
{
bfile * bf;
bf = malloc(sizeof(bfile));
if (NULL == bf)
return NULL;
bf->file = fopen(name, mode);
if (NULL == bf->file)
{
free(bf);
return NULL;
}
bf->rcnt = 0;
bf->wcnt = 0;
return bf;
}
int bfread(bfile *bf)
{
if (0 == bf->rcnt) /* read new byte */
{
bf->rbuf = (char)fgetc(bf->file);
bf->rcnt = 8;
}
bf->rcnt--;
return (bf->rbuf & (1 << bf->rcnt)) != 0;
}
void bfwrite(int bit, bfile *bf)
{
if (8 == bf->wcnt) /* write full byte */
{
fputc(bf->wbuf, bf->file);
bf->wcnt = 0;
}
bf->wcnt++;
bf->wbuf <<= 1;
bf->wbuf |= bit & 1;
}
void bfclose(bfile *bf)
{
fclose(bf->file);
free(bf);
}
void test1(void)
{
bfile *out;
bfile *in;
FILE *in1;
FILE *in2;
in = bfopen("bitfiles.c", "rb");
out = bfopen("bitfiles.cc", "wb");
if ((NULL == in) || (NULL == out))
{
printf("Can't open/create test files\n");
exit(1);
}
while (!feof(in->file))
bfwrite(bfread(in), out);
bfclose(in);
bfclose(out);
in1 = fopen("bitfiles.c", "rb");
in2 = fopen("bitfiles.cc", "rb");
if ((NULL == in1) || (NULL == in2))
{
printf("Can't open test files for verifying\n");
exit(1);
}
while (!feof(in1) && !feof(in2))
{
if (fgetc(in1) != fgetc(in2))
{
printf("Files not identical, copy failed!\n");
exit(1);
}
}
if (!feof(in1) || !feof(in2))
{
printf("Not same size, copy failed!\n");
exit(1);
}
fclose(in1);
fclose(in2);
}
void test2(void)
{
FILE *in1;
bfile *in2;
int ch;
in1 = fopen("bitfiles.c", "rb");
in2 = bfopen("bitfiles.cc", "rb");
if ((NULL == in1) || (NULL == in2))
{
printf("Can't open test files\n");
exit(1);
}
while (!feof(in1) && !feof(in2->file))
{
ch = fgetc(in1);
if (ch < ' ')
ch = '.';
printf(" '%c' ", ch);
for (ch = 0; ch < 8; ch++)
printf("%c", "01"[bfread(in2)]);
printf(" ");
}
fclose(in1);
bfclose(in2);
}
void main(void)
{
test1();
test2();
}
|
