Home | History | Annotate | Line # | Download | only in gzip
unbzip2.c revision 1.4 
      1 /*	$NetBSD: unbzip2.c,v 1.4 2004/04/25 16:20:33 mrg Exp $	*/
      2 
      3 /* This file is #included by gzip.c */
      4 
      5 static off_t
      6 unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
      7 {
      8 	int		ret, end_of_file;
      9 	size_t		n;
     10 	off_t		bytes_out = 0;
     11 	bz_stream	bzs;
     12 	static char	*inbuf, *outbuf;
     13 
     14 	if (inbuf == NULL && (inbuf = malloc(BUFLEN)) == NULL)
     15 	        maybe_err(1, "malloc");
     16 	if (outbuf == NULL && (outbuf = malloc(BUFLEN)) == NULL)
     17 	        maybe_err(1, "malloc");
     18 
     19 	bzs.bzalloc = NULL;
     20 	bzs.bzfree = NULL;
     21 	bzs.opaque = NULL;
     22 
     23 	end_of_file = 0;
     24 	ret = BZ2_bzDecompressInit(&bzs, 0, 0);
     25 	if (ret != BZ_OK)
     26 	        maybe_errx(1, "bzip2 init");
     27 
     28 	/* Prepend. */
     29 	bzs.avail_in = prelen;
     30 	bzs.next_in = pre;
     31 
     32 	if (bytes_in)
     33 		*bytes_in = prelen;
     34 
     35 	while (ret != BZ_STREAM_END) {
     36 	        if (bzs.avail_in == 0 && !end_of_file) {
     37 	                n = read(in, inbuf, BUFLEN);
     38 	                if (n < 0)
     39 	                        maybe_err(1, "read");
     40 	                if (n == 0)
     41 	                        end_of_file = 1;
     42 	                bzs.next_in = inbuf;
     43 	                bzs.avail_in = n;
     44 			if (bytes_in)
     45 				*bytes_in += n;
     46 	        }
     47 
     48 	        bzs.next_out = outbuf;
     49 	        bzs.avail_out = BUFLEN;
     50 	        ret = BZ2_bzDecompress(&bzs);
     51 
     52 	        switch (ret) {
     53 	        case BZ_STREAM_END:
     54 	        case BZ_OK:
     55 	                if (ret == BZ_OK && end_of_file)
     56 	                        maybe_err(1, "read");
     57 	                if (!tflag) {
     58 	                        n = write(out, outbuf, BUFLEN - bzs.avail_out);
     59 	                        if (n < 0)
     60 	                                maybe_err(1, "write");
     61 	                }
     62 	                bytes_out += n;
     63 	                break;
     64 
     65 	        case BZ_DATA_ERROR:
     66 	                maybe_errx(1, "bzip2 data integrity error");
     67 	        case BZ_DATA_ERROR_MAGIC:
     68 	                maybe_errx(1, "bzip2 magic number error");
     69 	        case BZ_MEM_ERROR:
     70 	                maybe_errx(1, "bzip2 out of memory");
     71 	        }
     72 	}
     73 
     74 	if (BZ2_bzDecompressEnd(&bzs) != BZ_OK)
     75 	        return (0);
     76 
     77 	return (bytes_out);
     78 }
     79