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Added is_file_compressed

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This commit is contained in:
Timo Schulz 2001-12-22 12:46:47 +00:00
parent 4011228458
commit 0d3b9f0245
6 changed files with 74 additions and 84 deletions
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42
util/fileutil.c
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@ -184,4 +184,46 @@ print_fname_stdin( const char *s )
return s;
}
/**
* Check if the file is compressed.
**/
int
is_file_compressed(const char *s, int *r_status)
{
IOBUF a;
int i, rc = 0;
byte buf[4];
const byte sigs[4][4] = {
{0x42, 0x5a, 0x68, 0x39}, /* bzip2 */
{0x1f, 0x8b, 0x08, 0x08}, /* gzip */
{0x50, 0x4b, 0x03, 0x04} /* (pk)zip */
};
if (!s || *s == '-' || !r_status)
return 0; /* We can't check stdin or no file was given */
if ( (a = iobuf_open(s)) == NULL ) {
*r_status = G10ERR_OPEN_FILE;
return 0;
}
if (iobuf_get_filelength(a) < 4) {
*r_status = 0;
goto leave;
}
iobuf_read(a, buf, 4);
for (i=0; i<DIM(sigs); i++) {
if (!memcmp(buf, sigs[i], 4)) {
*r_status = 0;
rc = 1;
break;
}
}
leave:
iobuf_close(a);
return rc;
}