1 /* $NetBSD: unbzip2.c,v 1.9 2005/11/22 09:05:30 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 off_t bytes_out = 0; 10 bz_stream bzs; 11 static char *inbuf, *outbuf; 12 13 if (inbuf == NULL) 14 inbuf = malloc(BUFLEN); 15 if (outbuf == NULL) 16 outbuf = malloc(BUFLEN); 17 if (inbuf == NULL || outbuf == NULL) 18 maybe_err("malloc"); 19 20 bzs.bzalloc = NULL; 21 bzs.bzfree = NULL; 22 bzs.opaque = NULL; 23 24 end_of_file = 0; 25 ret = BZ2_bzDecompressInit(&bzs, 0, 0); 26 if (ret != BZ_OK) 27 maybe_errx("bzip2 init"); 28 29 /* Prepend. */ 30 bzs.avail_in = prelen; 31 bzs.next_in = pre; 32 33 if (bytes_in) 34 *bytes_in = prelen; 35 36 while (ret >= BZ_OK && ret != BZ_STREAM_END) { 37 if (bzs.avail_in == 0 && !end_of_file) { 38 ssize_t n; 39 40 n = read(in, inbuf, BUFLEN); 41 if (n < 0) 42 maybe_err("read"); 43 if (n == 0) 44 end_of_file = 1; 45 bzs.next_in = inbuf; 46 bzs.avail_in = n; 47 if (bytes_in) 48 *bytes_in += n; 49 } 50 51 bzs.next_out = outbuf; 52 bzs.avail_out = BUFLEN; 53 ret = BZ2_bzDecompress(&bzs); 54 55 switch (ret) { 56 case BZ_STREAM_END: 57 case BZ_OK: 58 if (ret == BZ_OK && end_of_file) 59 maybe_err("read"); 60 if (!tflag) { 61 ssize_t n; 62 63 n = write(out, outbuf, BUFLEN - bzs.avail_out); 64 if (n < 0) 65 maybe_err("write"); 66 bytes_out += n; 67 } 68 break; 69 70 case BZ_DATA_ERROR: 71 maybe_warnx("bzip2 data integrity error"); 72 break; 73 74 case BZ_DATA_ERROR_MAGIC: 75 maybe_warnx("bzip2 magic number error"); 76 break; 77 78 case BZ_MEM_ERROR: 79 maybe_warnx("bzip2 out of memory"); 80 break; 81 82 } 83 } 84 85 if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK) 86 return (-1); 87 88 return (bytes_out); 89 } 90