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Retrieving my old backups which are hit by the Linux Read-Ahead-Bug

This commit is contained in:
Thomas Schmitt 2007-08-22 14:05:03 +00:00
parent f567874c98
commit 5066b0ac38
1 changed files with 81 additions and 37 deletions
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118
test/telltoc.c
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@ -25,6 +25,8 @@
telltoc_media() prints some information about the media in a drive
telltoc_toc() prints a table of content (if there is content)
telltoc_msinfo() prints parameters for mkisofs option -C
telltoc_read_and_print() reads from data CD or from DVD and prints 7-bit
to stdout (encodings 0,2) or 8-bit to file (encoding 1)
When everything is done, main() releases the drive and shuts down libburn:
burn_drive_release();
burn_finish()
@ -564,46 +566,78 @@ ex:;
0 = default , 1 = raw 8 bit (dangerous for tty) , 2 = hex
*/
int telltoc_read_and_print(struct burn_drive *drive,
int start_sector, int sector_count, int encoding)
int start_sector, int sector_count, char *raw_file, int encoding)
{
int ret, j;
char *buf = NULL, line[81];
off_t data_count, i;
int ret, j, i, request, done;
char buf[16 * 2048], line[81];
off_t data_count, total_count= 0, last_reported_count= 0;
struct stat stbuf;
FILE *raw_fp = NULL;
if (sector_count <= 0)
return -1;
buf = malloc(sector_count * 2048);
ret = burn_read_data(drive, ((off_t) start_sector) * (off_t) 2048,
buf, ((off_t) sector_count) * (off_t) 2048,
&data_count, 0);
printf(
"Data : start=%ds , count=%ds , read=%ds , encoding=%d\n",
start_sector, sector_count, (int) (data_count / (off_t) 2048),
encoding);
if (encoding == 1) {
fwrite(buf, data_count, 1, stdout);
} else for (i = 0; i < data_count; i += 16) {
for (j = 0; j < 16 && i + j < data_count; j++) {
if (buf[i + j] >= ' ' && buf[i + j] <= 126 &&
encoding != 2)
sprintf(line + 3 * j, " %c ",
(int) buf[i + j]);
else
sprintf(line + 3 * j, "%2.2X ",
(unsigned char) buf[i + j]);
if (stat(raw_file,&stbuf) != -1) {
fprintf(stderr,"SORRY: target file '%s' already existing\n", raw_file);
return 1;
}
raw_fp = fopen(raw_file,"w");
if (raw_fp == NULL) {
fprintf(stderr,"SORRY: cannot open target file '%s' (%s)\n", raw_file, strerror(errno));
return 1;
}
printf(
"Data : start=%ds , count=%ds , read=0 , encoding=%d:'%s'\n",
start_sector, sector_count, encoding, raw_file);
} else
printf(
"Data : start=%ds , count=%ds , read=0 , encoding=%d\n",
start_sector, sector_count, encoding);
for (done = 0; done < sector_count; done += 16) {
if (sector_count - done > 16)
request = 16;
else
request = sector_count - done;
ret = burn_read_data(drive,
((off_t) start_sector + done) * (off_t) 2048,
buf, (off_t) (request * 2048), &data_count, 0);
total_count += data_count;
if (encoding == 1) {
if (data_count > 0)
fwrite(buf, data_count, 1, raw_fp);
} else for (i = 0; i < data_count; i += 16) {
for (j = 0; j < 16 && i + j < data_count; j++) {
if (buf[i + j] >= ' ' && buf[i + j] <= 126 &&
encoding != 2)
sprintf(line + 3 * j, " %c ",
(int) buf[i + j]);
else
sprintf(line + 3 * j, "%2.2X ",
(unsigned char) buf[i + j]);
}
line[3 * (j - 1) + 2] = 0;
printf("%s\n",line);
}
if (encoding == 1 &&
total_count - last_reported_count >= 1000 * 2048) {
fprintf(stderr,
"\rReading data : start=%ds , count=%ds , read=%ds ",
start_sector, sector_count,
(int) (total_count / (off_t) 2048));
last_reported_count = total_count;
}
if (ret <= 0) {
fprintf(stderr, "SORRY : Reading failed.\n");
break;
}
line[3 * (j - 1) + 2] = 0;
printf("%s\n",line);
}
printf(
"End Of Data : start=%ds , count=%ds , read=%ds , encoding=%d\n",
start_sector, sector_count, (int) (data_count / (off_t) 2048),
encoding);
if (last_reported_count > 0)
fprintf(stderr,
"\r \r");
printf("End Of Data : start=%ds , count=%ds , read=%ds\n",
start_sector, sector_count,(int) (total_count / (off_t) 2048));
if (ret <= 0)
fprintf(stderr, "SORRY : Reading failed.\n");
if (buf != NULL)
free(buf);
return ret;
}
@ -617,6 +651,7 @@ static int do_msinfo = 0;
static int print_help = 0;
static int do_capacities = 0;
static int read_start = -1, read_count = -1, print_encoding = 0;
static char print_raw_file[4096] = {""};
/** Converts command line arguments into above setup parameters.
@ -668,10 +703,11 @@ int telltoc_setup(int argc, char **argv)
sscanf(argv[i-2], "%d", &read_start);
sscanf(argv[i-1], "%d", &read_count);
print_encoding = 0;
if(strcmp(argv[i], "dangerously_raw")==0 || strcmp(argv[i],"1")==0)
print_encoding = 1;
else if(strcmp(argv[i], "hex") == 0 || strcmp(argv[i],"2") == 0)
print_encoding = 2;
if(strncmp(argv[i], "raw:", 4) == 0 || strcmp(argv[i],"1:") == 0) {
print_encoding = 1;
strcpy(print_raw_file, strchr(argv[i], ':') + 1);
} else if(strcmp(argv[i], "hex") == 0 || strcmp(argv[i], "2") == 0)
print_encoding = 2;
} else if (!strcmp(argv[i], "--help")) {
print_help = 1;
@ -687,6 +723,7 @@ int telltoc_setup(int argc, char **argv)
printf("Usage: %s\n", argv[0]);
printf(" [--drive <address>|<driveno>|\"-\"]\n");
printf(" [--media] [--capacities] [--toc] [--msinfo]\n");
printf(" [--read_and_print <start> <count> \"0\"|\"hex\"|\"raw\":<path>]\n");
printf("Examples\n");
printf("A bus scan (needs rw-permissions to see a drive):\n");
printf(" %s --drive -\n",argv[0]);
@ -700,6 +737,12 @@ int telltoc_setup(int argc, char **argv)
printf(" mkisofs ... -C \"$msinfo\" ...\n");
printf("Obtain what is available about drive 0 and its media\n");
printf(" %s --drive 0\n",argv[0]);
printf("View blocks 16 to 19 of data CD or DVD in printable form\n");
printf(" %s --drive /dev/sr1 --read_and_print 16 4 0 | less\n",
argv[0]);
printf("Copy data CD hit by Linux read-ahead-bug to file /tmp/iso\n");
printf(" %s --drive /dev/sr1 --read_and_print 0 1000000 raw:/tmp/iso\n",
argv[0]);
}
return 0;
}
@ -776,7 +819,8 @@ int main(int argc, char **argv)
}
if (read_start >= 0 && read_count > 0) {
ret = telltoc_read_and_print(drive_list[driveno].drive,
read_start, read_count, print_encoding);
read_start, read_count, print_raw_file,
print_encoding);
if (ret<=0)
{ret = 40; goto release_drive; }
}