NetBSD/gnu/usr.bin/gzip/unbzip2.c

82 lines
1.6 KiB
C

/* unbzip2.c -- decompress files in bzip2 format.
*/
#ifdef RCSID
static char rcsid[] = "$Id: unbzip2.c,v 1.2 1999/08/20 00:08:57 simonb Exp $";
#endif
#define BZ_NO_STDIO
#include <bzlib.h>
#include <stddef.h>
#include "gzip.h"
/* ============================================================================
* Bunzip2 in to out.
*/
int unbzip2(in, out)
int in, out; /* input and output file descriptors */
{
int n, ret, end_of_file;
bz_stream bzs;
bzs.bzalloc = NULL;
bzs.bzfree = NULL;
bzs.opaque = NULL;
end_of_file = 0;
if (bzDecompressInit(&bzs, 0, 0) != BZ_OK)
return(ERROR);
/* Use up the remainder of "inbuf" that's been read in already */
bzs.next_in = inbuf;
bzs.avail_in = insize;
while (1) {
if (bzs.avail_in == 0 && !end_of_file) {
n = read(in, inbuf, INBUFSIZ);
if (n < 0)
read_error();
if (n == 0)
end_of_file = 1;
bzs.next_in = inbuf;
bzs.avail_in = n;
}
bzs.next_out = outbuf;
bzs.avail_out = OUTBUFSIZ;
ret = bzDecompress(&bzs);
if (ret == BZ_STREAM_END) {
if (!test) {
n = write(out, outbuf, OUTBUFSIZ - bzs.avail_out);
if (n < 0)
write_error();
}
break;
}
else if (ret == BZ_OK) {
if (end_of_file)
read_error();
if (!test)
n = write(out, outbuf, OUTBUFSIZ - bzs.avail_out);
}
else {
switch (ret) {
case BZ_DATA_ERROR:
error("bzip2 data integrity error");
case BZ_DATA_ERROR_MAGIC:
error("bzip2 magic number error");
case BZ_MEM_ERROR:
error("bzip2 out of memory");
}
}
}
if (bzDecompressEnd(&bzs) != BZ_OK)
return(ERROR);
return(OK);
}