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PROGRAM
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SNIP9404.ZIP
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BITFILES.C
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C/C++ Source or Header
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1994-04-03
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3KB
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139 lines
/*
** 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();
}