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Make cochran debug output a bit easier to use directly

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Just do the hex-dump in the program, and print all the results to
standard output.  Avoid the need to do 'od' by hand etc to see what
happens when you play with the decoder.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2012-01-27 14:02:50 -08:00
parent b1a747f537
commit e5d2bdc9ba
1 changed files with 44 additions and 13 deletions
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57
cochran.c
View file

@ -1,4 +1,5 @@
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
@ -76,20 +77,50 @@ static int figure_out_modulus(const unsigned char *decode, const unsigned char *
return best;
}
static void cochran_debug_write(int dive, const unsigned char *data, unsigned size)
{
char buffer[60];
int fd;
#define hexchar(n) ("0123456789abcdef"[(n)&15])
snprintf(buffer, sizeof(buffer), "cochran.%d.out", dive);
fd = open(buffer, O_CREAT | O_TRUNC | O_WRONLY, 0666);
if (fd >= 0) {
write(fd, data, size);
close(fd);
static void show_line(unsigned offset, const unsigned char *data, unsigned size)
{
unsigned char bits;
int i, off;
char buffer[120];
if (size > 16)
size = 16;
bits = 0;
memset(buffer, ' ', sizeof(buffer));
off = sprintf(buffer, "%06x ", offset);
for (i = 0; i < size; i++) {
char *hex = buffer + off + 3*i;
char *asc = buffer + off + 50 + i;
unsigned char byte = data[i];
hex[0] = hexchar(byte>>4);
hex[1] = hexchar(byte);
bits |= byte;
if (byte < 32 || byte > 126)
byte = '.';
asc[0] = byte;
asc[1] = 0;
}
if (bits)
puts(buffer);
}
static void cochran_debug_write(const char *filename, int dive, const unsigned char *data, unsigned size)
{
int i;
printf("\n%s, dive %d\n\n", filename, dive);
for (i = 0; i < size; i += 16) {
show_line(i, data + i, size - i);
}
}
static void parse_cochran_dive(int dive, const unsigned char *decode, unsigned mod,
static void parse_cochran_dive(const char *filename, int dive,
const unsigned char *decode, unsigned mod,
const unsigned char *in, unsigned size)
{
char *buf = malloc(size);
@ -117,7 +148,7 @@ static void parse_cochran_dive(int dive, const unsigned char *decode, unsigned m
*/
partial_decode(0x48ff, size, decode, 0, mod, in, size, buf);
cochran_debug_write(dive, buf, size);
cochran_debug_write(filename, dive, buf, size);
free(buf);
}
@ -146,8 +177,8 @@ int try_to_open_cochran(const char *filename, struct memblock *mem, GError **err
break;
if (dive2 > mem->size)
break;
parse_cochran_dive(i, decode, mod, mem->buffer + dive1, dive2 - dive1);
parse_cochran_dive(filename, i, decode, mod, mem->buffer + dive1, dive2 - dive1);
}
return 1;
exit(0);
}