Home | History | Annotate | Line # | Download | only in gzip
unbzip2.c revision 1.6.2.1 
      1  1.6.2.1  snj /*	$NetBSD: unbzip2.c,v 1.6.2.1 2005/06/15 06:06:01 snj 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  1.6.2.1  snj 	size_t		n = 0;
     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      1.6  dsl 	if (inbuf == NULL)
     15      1.6  dsl 		inbuf = malloc(BUFLEN);
     16      1.6  dsl 	if (outbuf == NULL)
     17      1.6  dsl 		outbuf = malloc(BUFLEN);
     18      1.6  dsl 	if (inbuf == NULL || outbuf == NULL)
     19      1.5  mrg 	        maybe_err("malloc");
     20      1.3  mrg 
     21      1.3  mrg 	bzs.bzalloc = NULL;
     22      1.3  mrg 	bzs.bzfree = NULL;
     23      1.3  mrg 	bzs.opaque = NULL;
     24      1.3  mrg 
     25      1.3  mrg 	end_of_file = 0;
     26      1.3  mrg 	ret = BZ2_bzDecompressInit(&bzs, 0, 0);
     27      1.3  mrg 	if (ret != BZ_OK)
     28      1.5  mrg 	        maybe_errx("bzip2 init");
     29      1.3  mrg 
     30      1.4  mrg 	/* Prepend. */
     31      1.4  mrg 	bzs.avail_in = prelen;
     32      1.4  mrg 	bzs.next_in = pre;
     33      1.4  mrg 
     34      1.4  mrg 	if (bytes_in)
     35      1.4  mrg 		*bytes_in = prelen;
     36      1.3  mrg 
     37      1.3  mrg 	while (ret != BZ_STREAM_END) {
     38      1.3  mrg 	        if (bzs.avail_in == 0 && !end_of_file) {
     39      1.4  mrg 	                n = read(in, inbuf, BUFLEN);
     40      1.3  mrg 	                if (n < 0)
     41      1.5  mrg 	                        maybe_err("read");
     42      1.3  mrg 	                if (n == 0)
     43      1.3  mrg 	                        end_of_file = 1;
     44      1.3  mrg 	                bzs.next_in = inbuf;
     45      1.3  mrg 	                bzs.avail_in = n;
     46      1.4  mrg 			if (bytes_in)
     47      1.4  mrg 				*bytes_in += n;
     48      1.4  mrg 	        }
     49      1.3  mrg 
     50      1.3  mrg 	        bzs.next_out = outbuf;
     51      1.4  mrg 	        bzs.avail_out = BUFLEN;
     52      1.3  mrg 	        ret = BZ2_bzDecompress(&bzs);
     53      1.3  mrg 
     54      1.3  mrg 	        switch (ret) {
     55      1.3  mrg 	        case BZ_STREAM_END:
     56      1.3  mrg 	        case BZ_OK:
     57      1.3  mrg 	                if (ret == BZ_OK && end_of_file)
     58      1.5  mrg 	                        maybe_err("read");
     59      1.3  mrg 	                if (!tflag) {
     60      1.4  mrg 	                        n = write(out, outbuf, BUFLEN - bzs.avail_out);
     61      1.3  mrg 	                        if (n < 0)
     62      1.5  mrg 	                                maybe_err("write");
     63      1.3  mrg 	                }
     64      1.3  mrg 	                bytes_out += n;
     65      1.3  mrg 	                break;
     66      1.3  mrg 
     67      1.3  mrg 	        case BZ_DATA_ERROR:
     68      1.6  dsl 	                maybe_warnx("bzip2 data integrity error");
     69      1.5  mrg 			break;
     70      1.5  mrg 
     71      1.3  mrg 	        case BZ_DATA_ERROR_MAGIC:
     72      1.6  dsl 	                maybe_warnx("bzip2 magic number error");
     73      1.5  mrg 			break;
     74      1.5  mrg 
     75      1.3  mrg 	        case BZ_MEM_ERROR:
     76      1.6  dsl 	                maybe_warnx("bzip2 out of memory");
     77      1.5  mrg 			break;
     78      1.5  mrg 
     79      1.3  mrg 	        }
     80      1.3  mrg 	}
     81      1.1  mrg 
     82      1.5  mrg 	if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK)
     83      1.5  mrg 	        return (-1);
     84      1.1  mrg 
     85      1.1  mrg 	return (bytes_out);
     86      1.1  mrg }
     87