Contents of /trunk/mkinitrd-magellan/klibc/usr/gzip/unzip.c
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Revision 815 -
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Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
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File size: 2116 byte(s)
Fri Apr 24 18:32:46 2009 UTC (15 years ago) by niro
File MIME type: text/plain
File size: 2116 byte(s)
-updated to klibc-1.5.15
1 | /* unzip.c -- decompress files in gzip or pkzip format. |
2 | * Copyright (C) 1992-1993 Jean-loup Gailly |
3 | * This is free software; you can redistribute it and/or modify it under the |
4 | * terms of the GNU General Public License, see the file COPYING. |
5 | * |
6 | * The code in this file is derived from the file funzip.c written |
7 | * and put in the public domain by Mark Adler. |
8 | */ |
9 | |
10 | /* |
11 | This version can extract files in gzip format. |
12 | Only the first entry is extracted, and it has to be |
13 | either deflated or stored. |
14 | */ |
15 | |
16 | #ifdef RCSID |
17 | static char rcsid[] = "$Id: unzip.c,v 1.1 2002/08/18 00:59:21 hpa Exp $"; |
18 | #endif |
19 | |
20 | #include "tailor.h" |
21 | #include "gzip.h" |
22 | |
23 | /* =========================================================================== |
24 | * Unzip in to out. This routine works on gzip files only. |
25 | * |
26 | * IN assertions: the buffer inbuf contains already the beginning of |
27 | * the compressed data, from offsets inptr to insize-1 included. |
28 | * The magic header has already been checked. The output buffer is cleared. |
29 | */ |
30 | int unzip(in, out) |
31 | int in, out; /* input and output file descriptors */ |
32 | { |
33 | ulg orig_crc = 0; /* original crc */ |
34 | ulg orig_len = 0; /* original uncompressed length */ |
35 | int n; |
36 | uch buf[8]; /* extended local header */ |
37 | |
38 | ifd = in; |
39 | ofd = out; |
40 | |
41 | updcrc(NULL, 0); /* initialize crc */ |
42 | |
43 | /* Decompress */ |
44 | if (method == DEFLATED) { |
45 | |
46 | int res = inflate(); |
47 | |
48 | if (res == 3) { |
49 | error("out of memory"); |
50 | } else if (res != 0) { |
51 | error("invalid compressed data--format violated"); |
52 | } |
53 | |
54 | } else { |
55 | error("internal error, invalid method"); |
56 | } |
57 | |
58 | /* Get the crc and original length */ |
59 | /* crc32 (see algorithm.doc) |
60 | * uncompressed input size modulo 2^32 |
61 | */ |
62 | for (n = 0; n < 8; n++) { |
63 | buf[n] = (uch)get_byte(); /* may cause an error if EOF */ |
64 | } |
65 | orig_crc = LG(buf); |
66 | orig_len = LG(buf+4); |
67 | |
68 | /* Validate decompression */ |
69 | if (orig_crc != updcrc(outbuf, 0)) { |
70 | error("invalid compressed data--crc error"); |
71 | } |
72 | if (orig_len != (ulg)bytes_out) { |
73 | error("invalid compressed data--length error"); |
74 | } |
75 | |
76 | return OK; |
77 | } |