81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*
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Because they are parsed from the end, Canon CRW files
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become unreadable if garbage data is appended to them, as
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often happens when files are recovered from damaged media.
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This program truncates CRW files to the correct size.
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Copyright 2005 by Dave Coffin, dcoffin a cybercom o net
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Free for all uses.
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$Revision$
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$Date$
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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unsigned char *buffer;
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int get4 (int i)
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{
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if (buffer[0] == 'I')
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return buffer[i+3] << 24 | buffer[i+2] << 16 | buffer[i+1] << 8 | buffer[i];
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else
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return buffer[i] << 24 | buffer[i+1] << 16 | buffer[i+2] << 8 | buffer[i+3];
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}
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int main (int argc, char **argv)
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{
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int arg, size, end, diff, status=1;
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unsigned char *fname;
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FILE *fp;
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if (argc == 1)
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fprintf (stderr, "Usage: %s crw_0001.crw crw_0002.crw ...\n", argv[0]);
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for (arg=1; arg < argc; arg++) {
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status = 1;
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fp = fopen (argv[arg], "rb");
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fseek (fp, 0, SEEK_END);
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size = ftell(fp);
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buffer = malloc (size + strlen(argv[arg]) + 10);
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if (!buffer) {
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fprintf (stderr, "Cannot allocate memory!\n");
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return 2;
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}
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fname = buffer + size;
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sprintf (fname, "%s.clean", argv[arg]);
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fseek (fp, 0, SEEK_SET);
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fread (buffer, 1, size, fp);
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fclose (fp);
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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]);
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free (buffer);
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continue;
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}
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for (end=size; end > 0xa0000; end--) {
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diff = end - get4(end-4);
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if (diff > 50 && diff < 120 && diff % 10 == 2) {
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status = 0;
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break;
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}
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}
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if (status)
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fprintf (stderr, "Failed to clean %s\n", argv[arg]);
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else {
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if ((fp = fopen (fname, "wb"))) {
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fprintf (stderr, "Writing %s\n", fname);
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fwrite (buffer, 1, end, fp);
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fclose (fp);
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} else {
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perror (fname);
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status = 1;
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}
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}
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free (buffer);
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}
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return status;
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}
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