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unbzip2.c revision 1.6 
      1 /*	$NetBSD: unbzip2.c,v 1.6 2004/09/05 21:32:30 dsl 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)
     15 		inbuf = malloc(BUFLEN);
     16 	if (outbuf == NULL)
     17 		outbuf = malloc(BUFLEN);
     18 	if (inbuf == NULL || outbuf == NULL)
     19 	        maybe_err("malloc");
     20 
     21 	bzs.bzalloc = NULL;
     22 	bzs.bzfree = NULL;
     23 	bzs.opaque = NULL;
     24 
     25 	end_of_file = 0;
     26 	ret = BZ2_bzDecompressInit(&bzs, 0, 0);
     27 	if (ret != BZ_OK)
     28 	        maybe_errx("bzip2 init");
     29 
     30 	/* Prepend. */
     31 	bzs.avail_in = prelen;
     32 	bzs.next_in = pre;
     33 
     34 	if (bytes_in)
     35 		*bytes_in = prelen;
     36 
     37 	while (ret != BZ_STREAM_END) {
     38 	        if (bzs.avail_in == 0 && !end_of_file) {
     39 	                n = read(in, inbuf, BUFLEN);
     40 	                if (n < 0)
     41 	                        maybe_err("read");
     42 	                if (n == 0)
     43 	                        end_of_file = 1;
     44 	                bzs.next_in = inbuf;
     45 	                bzs.avail_in = n;
     46 			if (bytes_in)
     47 				*bytes_in += n;
     48 	        }
     49 
     50 	        bzs.next_out = outbuf;
     51 	        bzs.avail_out = BUFLEN;
     52 	        ret = BZ2_bzDecompress(&bzs);
     53 
     54 	        switch (ret) {
     55 	        case BZ_STREAM_END:
     56 	        case BZ_OK:
     57 	                if (ret == BZ_OK && end_of_file)
     58 	                        maybe_err("read");
     59 	                if (!tflag) {
     60 	                        n = write(out, outbuf, BUFLEN - bzs.avail_out);
     61 	                        if (n < 0)
     62 	                                maybe_err("write");
     63 	                }
     64 	                bytes_out += n;
     65 	                break;
     66 
     67 	        case BZ_DATA_ERROR:
     68 	                maybe_warnx("bzip2 data integrity error");
     69 			break;
     70 
     71 	        case BZ_DATA_ERROR_MAGIC:
     72 	                maybe_warnx("bzip2 magic number error");
     73 			break;
     74 
     75 	        case BZ_MEM_ERROR:
     76 	                maybe_warnx("bzip2 out of memory");
     77 			break;
     78 
     79 	        }
     80 	}
     81 
     82 	if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK)
     83 	        return (-1);
     84 
     85 	return (bytes_out);
     86 }
     87