2
Because they are parsed from the end, Canon CRW files
3
become unreadable if garbage data is appended to them, as
4
often happens when files are recovered from damaged media.
5
This program truncates CRW files to the correct size.
7
Copyright 2005 by Dave Coffin, dcoffin a cybercom o net
18
unsigned char *buffer;
23
return buffer[i+3] << 24 | buffer[i+2] << 16 | buffer[i+1] << 8 | buffer[i];
25
return buffer[i] << 24 | buffer[i+1] << 16 | buffer[i+2] << 8 | buffer[i+3];
28
int main (int argc, char **argv)
30
int arg, size, end, diff, status=1;
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fprintf (stderr, "Usage: %s crw_0001.crw crw_0002.crw ...\n", argv[0]);
37
for (arg=1; arg < argc; arg++) {
39
fp = fopen (argv[arg], "rb");
40
fseek (fp, 0, SEEK_END);
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buffer = malloc (size + strlen(argv[arg]) + 10);
44
fprintf (stderr, "Cannot allocate memory!\n");
47
fname = buffer + size;
48
sprintf (fname, "%s.clean", argv[arg]);
49
fseek (fp, 0, SEEK_SET);
50
fread (buffer, 1, size, fp);
52
if (strncmp (buffer, "II\x1a\0\0\0HEAPCCDR", 14) &&
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strncmp (buffer, "MM\0\0\0\x1aHEAPCCDR", 14)) {
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fprintf (stderr, "%s is not a CRW file!\n", argv[arg]);
58
for (end=size; end > 0xa0000; end--) {
59
diff = end - get4(end-4);
60
if (diff > 50 && diff < 120 && diff % 10 == 2) {
66
fprintf (stderr, "Failed to clean %s\n", argv[arg]);
68
if ((fp = fopen (fname, "wb"))) {
69
fprintf (stderr, "Writing %s\n", fname);
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fwrite (buffer, 1, end, fp);