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unbzip2.c revision 1.1.2.3 
      1  1.1.2.3    jmc /*	$NetBSD: unbzip2.c,v 1.1.2.3 2004/04/29 04:48:40 jmc Exp $	*/
      2      1.1    mrg 
      3      1.1    mrg /* This file is #included by gzip.c */
      4      1.1    mrg 
      5      1.1    mrg static off_t
      6  1.1.2.3    jmc unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
      7      1.1    mrg {
      8  1.1.2.3    jmc 	int		ret, end_of_file;
      9  1.1.2.3    jmc 	size_t		n;
     10      1.1    mrg 	off_t		bytes_out = 0;
     11  1.1.2.2  grant 	bz_stream	bzs;
     12  1.1.2.2  grant 	static char	*inbuf, *outbuf;
     13      1.1    mrg 
     14  1.1.2.3    jmc 	if (inbuf == NULL && (inbuf = malloc(BUFLEN)) == NULL)
     15  1.1.2.2  grant 	        maybe_err(1, "malloc");
     16  1.1.2.3    jmc 	if (outbuf == NULL && (outbuf = malloc(BUFLEN)) == NULL)
     17  1.1.2.2  grant 	        maybe_err(1, "malloc");
     18  1.1.2.2  grant 
     19  1.1.2.2  grant 	bzs.bzalloc = NULL;
     20  1.1.2.2  grant 	bzs.bzfree = NULL;
     21  1.1.2.2  grant 	bzs.opaque = NULL;
     22  1.1.2.2  grant 
     23  1.1.2.2  grant 	end_of_file = 0;
     24  1.1.2.2  grant 	ret = BZ2_bzDecompressInit(&bzs, 0, 0);
     25  1.1.2.2  grant 	if (ret != BZ_OK)
     26  1.1.2.2  grant 	        maybe_errx(1, "bzip2 init");
     27  1.1.2.2  grant 
     28  1.1.2.3    jmc 	/* Prepend. */
     29  1.1.2.3    jmc 	bzs.avail_in = prelen;
     30  1.1.2.3    jmc 	bzs.next_in = pre;
     31  1.1.2.3    jmc 
     32  1.1.2.3    jmc 	if (bytes_in)
     33  1.1.2.3    jmc 		*bytes_in = prelen;
     34  1.1.2.2  grant 
     35  1.1.2.2  grant 	while (ret != BZ_STREAM_END) {
     36  1.1.2.2  grant 	        if (bzs.avail_in == 0 && !end_of_file) {
     37  1.1.2.3    jmc 	                n = read(in, inbuf, BUFLEN);
     38  1.1.2.2  grant 	                if (n < 0)
     39  1.1.2.2  grant 	                        maybe_err(1, "read");
     40  1.1.2.2  grant 	                if (n == 0)
     41  1.1.2.2  grant 	                        end_of_file = 1;
     42  1.1.2.2  grant 	                bzs.next_in = inbuf;
     43  1.1.2.2  grant 	                bzs.avail_in = n;
     44  1.1.2.3    jmc 			if (bytes_in)
     45  1.1.2.3    jmc 				*bytes_in += n;
     46  1.1.2.3    jmc 	        }
     47  1.1.2.2  grant 
     48  1.1.2.2  grant 	        bzs.next_out = outbuf;
     49  1.1.2.3    jmc 	        bzs.avail_out = BUFLEN;
     50  1.1.2.2  grant 	        ret = BZ2_bzDecompress(&bzs);
     51  1.1.2.2  grant 
     52  1.1.2.2  grant 	        switch (ret) {
     53  1.1.2.2  grant 	        case BZ_STREAM_END:
     54  1.1.2.2  grant 	        case BZ_OK:
     55  1.1.2.2  grant 	                if (ret == BZ_OK && end_of_file)
     56  1.1.2.2  grant 	                        maybe_err(1, "read");
     57  1.1.2.2  grant 	                if (!tflag) {
     58  1.1.2.3    jmc 	                        n = write(out, outbuf, BUFLEN - bzs.avail_out);
     59  1.1.2.2  grant 	                        if (n < 0)
     60  1.1.2.2  grant 	                                maybe_err(1, "write");
     61  1.1.2.2  grant 	                }
     62  1.1.2.2  grant 	                bytes_out += n;
     63  1.1.2.2  grant 	                break;
     64  1.1.2.2  grant 
     65  1.1.2.2  grant 	        case BZ_DATA_ERROR:
     66  1.1.2.2  grant 	                maybe_errx(1, "bzip2 data integrity error");
     67  1.1.2.2  grant 	        case BZ_DATA_ERROR_MAGIC:
     68  1.1.2.2  grant 	                maybe_errx(1, "bzip2 magic number error");
     69  1.1.2.2  grant 	        case BZ_MEM_ERROR:
     70  1.1.2.2  grant 	                maybe_errx(1, "bzip2 out of memory");
     71  1.1.2.2  grant 	        }
     72  1.1.2.2  grant 	}
     73      1.1    mrg 
     74  1.1.2.2  grant 	if (BZ2_bzDecompressEnd(&bzs) != BZ_OK)
     75  1.1.2.2  grant 	        return (0);
     76      1.1    mrg 
     77      1.1    mrg 	return (bytes_out);
     78      1.1    mrg }
     79