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