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unbzip2.c revision 1.5 
      1  1.5  mrg /*	$NetBSD: unbzip2.c,v 1.5 2004/05/25 04:34:40 mrg 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  1.4  mrg unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
      7  1.1  mrg {
      8  1.4  mrg 	int		ret, end_of_file;
      9  1.4  mrg 	size_t		n;
     10  1.1  mrg 	off_t		bytes_out = 0;
     11  1.3  mrg 	bz_stream	bzs;
     12  1.3  mrg 	static char	*inbuf, *outbuf;
     13  1.1  mrg 
     14  1.4  mrg 	if (inbuf == NULL && (inbuf = malloc(BUFLEN)) == NULL)
     15  1.5  mrg 	        maybe_err("malloc");
     16  1.4  mrg 	if (outbuf == NULL && (outbuf = malloc(BUFLEN)) == NULL)
     17  1.5  mrg 	        maybe_err("malloc");
     18  1.3  mrg 
     19  1.3  mrg 	bzs.bzalloc = NULL;
     20  1.3  mrg 	bzs.bzfree = NULL;
     21  1.3  mrg 	bzs.opaque = NULL;
     22  1.3  mrg 
     23  1.3  mrg 	end_of_file = 0;
     24  1.3  mrg 	ret = BZ2_bzDecompressInit(&bzs, 0, 0);
     25  1.3  mrg 	if (ret != BZ_OK)
     26  1.5  mrg 	        maybe_errx("bzip2 init");
     27  1.3  mrg 
     28  1.4  mrg 	/* Prepend. */
     29  1.4  mrg 	bzs.avail_in = prelen;
     30  1.4  mrg 	bzs.next_in = pre;
     31  1.4  mrg 
     32  1.4  mrg 	if (bytes_in)
     33  1.4  mrg 		*bytes_in = prelen;
     34  1.3  mrg 
     35  1.3  mrg 	while (ret != BZ_STREAM_END) {
     36  1.3  mrg 	        if (bzs.avail_in == 0 && !end_of_file) {
     37  1.4  mrg 	                n = read(in, inbuf, BUFLEN);
     38  1.3  mrg 	                if (n < 0)
     39  1.5  mrg 	                        maybe_err("read");
     40  1.3  mrg 	                if (n == 0)
     41  1.3  mrg 	                        end_of_file = 1;
     42  1.3  mrg 	                bzs.next_in = inbuf;
     43  1.3  mrg 	                bzs.avail_in = n;
     44  1.4  mrg 			if (bytes_in)
     45  1.4  mrg 				*bytes_in += n;
     46  1.4  mrg 	        }
     47  1.3  mrg 
     48  1.3  mrg 	        bzs.next_out = outbuf;
     49  1.4  mrg 	        bzs.avail_out = BUFLEN;
     50  1.3  mrg 	        ret = BZ2_bzDecompress(&bzs);
     51  1.3  mrg 
     52  1.3  mrg 	        switch (ret) {
     53  1.3  mrg 	        case BZ_STREAM_END:
     54  1.3  mrg 	        case BZ_OK:
     55  1.3  mrg 	                if (ret == BZ_OK && end_of_file)
     56  1.5  mrg 	                        maybe_err("read");
     57  1.3  mrg 	                if (!tflag) {
     58  1.4  mrg 	                        n = write(out, outbuf, BUFLEN - bzs.avail_out);
     59  1.3  mrg 	                        if (n < 0)
     60  1.5  mrg 	                                maybe_err("write");
     61  1.3  mrg 	                }
     62  1.3  mrg 	                bytes_out += n;
     63  1.3  mrg 	                break;
     64  1.3  mrg 
     65  1.3  mrg 	        case BZ_DATA_ERROR:
     66  1.5  mrg 	                maybe_warn("bzip2 data integrity error");
     67  1.5  mrg 			break;
     68  1.5  mrg 
     69  1.3  mrg 	        case BZ_DATA_ERROR_MAGIC:
     70  1.5  mrg 	                maybe_warn("bzip2 magic number error");
     71  1.5  mrg 			break;
     72  1.5  mrg 
     73  1.3  mrg 	        case BZ_MEM_ERROR:
     74  1.5  mrg 	                maybe_warn("bzip2 out of memory");
     75  1.5  mrg 			break;
     76  1.5  mrg 
     77  1.3  mrg 	        }
     78  1.3  mrg 	}
     79  1.1  mrg 
     80  1.5  mrg 	if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK)
     81  1.5  mrg 	        return (-1);
     82  1.1  mrg 
     83  1.1  mrg 	return (bytes_out);
     84  1.1  mrg }
     85