1 /* $NetBSD: unbzip2.c,v 1.5 2004/05/25 04:34:40 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("malloc"); 16 if (outbuf == NULL && (outbuf = malloc(BUFLEN)) == NULL) 17 maybe_err("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("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("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("read"); 57 if (!tflag) { 58 n = write(out, outbuf, BUFLEN - bzs.avail_out); 59 if (n < 0) 60 maybe_err("write"); 61 } 62 bytes_out += n; 63 break; 64 65 case BZ_DATA_ERROR: 66 maybe_warn("bzip2 data integrity error"); 67 break; 68 69 case BZ_DATA_ERROR_MAGIC: 70 maybe_warn("bzip2 magic number error"); 71 break; 72 73 case BZ_MEM_ERROR: 74 maybe_warn("bzip2 out of memory"); 75 break; 76 77 } 78 } 79 80 if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK) 81 return (-1); 82 83 return (bytes_out); 84 } 85