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unbzip2.c revision 1.3 
      1  1.2  mrg /*	$NetBSD: unbzip2.c,v 1.3 2004/03/30 11:43:32 mrg Exp $	*/
      2  1.1  mrg 
      3  1.1  mrg /* This file is #included by gzip.c */
      4  1.1  mrg 
      5  1.3  mrg #define INBUFSIZE	(64 * 1024)
      6  1.3  mrg #define OUTBUFSIZE	(64 * 1024)
      7  1.3  mrg 
      8  1.1  mrg static off_t
      9  1.1  mrg unbzip2(int in, int out)
     10  1.1  mrg {
     11  1.3  mrg 	int		n, ret, end_of_file;
     12  1.1  mrg 	off_t		bytes_out = 0;
     13  1.3  mrg 	bz_stream	bzs;
     14  1.3  mrg 	static char	*inbuf, *outbuf;
     15  1.1  mrg 
     16  1.3  mrg 	if (inbuf == NULL && (inbuf = malloc(INBUFSIZE)) == NULL)
     17  1.3  mrg 	        maybe_err(1, "malloc");
     18  1.3  mrg 	if (outbuf == NULL && (outbuf = malloc(OUTBUFSIZE)) == NULL)
     19  1.3  mrg 	        maybe_err(1, "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  1.3  mrg 	        maybe_errx(1, "bzip2 init");
     29  1.3  mrg 
     30  1.3  mrg 	bzs.avail_in = 0;
     31  1.3  mrg 
     32  1.3  mrg 	while (ret != BZ_STREAM_END) {
     33  1.3  mrg 	        if (bzs.avail_in == 0 && !end_of_file) {
     34  1.3  mrg 	                n = read(in, inbuf, INBUFSIZE);
     35  1.3  mrg 	                if (n < 0)
     36  1.3  mrg 	                        maybe_err(1, "read");
     37  1.3  mrg 	                if (n == 0)
     38  1.3  mrg 	                        end_of_file = 1;
     39  1.3  mrg 	                bzs.next_in = inbuf;
     40  1.3  mrg 	                bzs.avail_in = n;
     41  1.3  mrg 	        } else
     42  1.3  mrg 	                n = 0;
     43  1.3  mrg 
     44  1.3  mrg 	        bzs.next_out = outbuf;
     45  1.3  mrg 	        bzs.avail_out = OUTBUFSIZE;
     46  1.3  mrg 	        ret = BZ2_bzDecompress(&bzs);
     47  1.3  mrg 
     48  1.3  mrg 	        switch (ret) {
     49  1.3  mrg 	        case BZ_STREAM_END:
     50  1.3  mrg 	        case BZ_OK:
     51  1.3  mrg 	                if (ret == BZ_OK && end_of_file)
     52  1.3  mrg 	                        maybe_err(1, "read");
     53  1.3  mrg 	                if (!tflag) {
     54  1.3  mrg 	                        n = write(out, outbuf, OUTBUFSIZE - bzs.avail_out);
     55  1.3  mrg 	                        if (n < 0)
     56  1.3  mrg 	                                maybe_err(1, "write");
     57  1.3  mrg 	                }
     58  1.3  mrg 	                bytes_out += n;
     59  1.3  mrg 	                break;
     60  1.3  mrg 
     61  1.3  mrg 	        case BZ_DATA_ERROR:
     62  1.3  mrg 	                maybe_errx(1, "bzip2 data integrity error");
     63  1.3  mrg 	        case BZ_DATA_ERROR_MAGIC:
     64  1.3  mrg 	                maybe_errx(1, "bzip2 magic number error");
     65  1.3  mrg 	        case BZ_MEM_ERROR:
     66  1.3  mrg 	                maybe_errx(1, "bzip2 out of memory");
     67  1.3  mrg 	        }
     68  1.3  mrg 	}
     69  1.1  mrg 
     70  1.3  mrg 	if (BZ2_bzDecompressEnd(&bzs) != BZ_OK)
     71  1.3  mrg 	        return (0);
     72  1.1  mrg 
     73  1.1  mrg 	return (bytes_out);
     74  1.1  mrg }
     75