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;
35 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);
42 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) &&
53 strncmp (buffer, "MM\0\0\0\x1aHEAPCCDR", 14)) {
54 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);
70 fwrite (buffer, 1, end, fp);