Contents of /trunk/mkinitrd-magellan/busybox/archival/gunzip.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File MIME type: text/plain
File size: 4580 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Gzip implementation for busybox |
4 | * |
5 | * Based on GNU gzip v1.2.4 Copyright (C) 1992-1993 Jean-loup Gailly. |
6 | * |
7 | * Originally adjusted for busybox by Sven Rudolph <sr1@inf.tu-dresden.de> |
8 | * based on gzip sources |
9 | * |
10 | * Adjusted further by Erik Andersen <andersen@codepoet.org> to support files as |
11 | * well as stdin/stdout, and to generally behave itself wrt command line |
12 | * handling. |
13 | * |
14 | * General cleanup to better adhere to the style guide and make use of standard |
15 | * busybox functions by Glenn McGrath <bug1@iinet.net.au> |
16 | * |
17 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
18 | * |
19 | * gzip (GNU zip) -- compress files with zip algorithm and 'compress' interface |
20 | * Copyright (C) 1992-1993 Jean-loup Gailly |
21 | * The unzip code was written and put in the public domain by Mark Adler. |
22 | * Portions of the lzw code are derived from the public domain 'compress' |
23 | * written by Spencer Thomas, Joe Orost, James Woods, Jim McKie, Steve Davies, |
24 | * Ken Turkowski, Dave Mack and Peter Jannesen. |
25 | * |
26 | * See the license_msg below and the file COPYING for the software license. |
27 | * See the file algorithm.doc for the compression algorithms and file formats. |
28 | */ |
29 | |
30 | #include "busybox.h" |
31 | #include "unarchive.h" |
32 | |
33 | #define GUNZIP_OPT_STDOUT 1 |
34 | #define GUNZIP_OPT_FORCE 2 |
35 | #define GUNZIP_OPT_TEST 4 |
36 | #define GUNZIP_OPT_DECOMPRESS 8 |
37 | #define GUNZIP_OPT_VERBOSE 0x10 |
38 | |
39 | int gunzip_main(int argc, char **argv) |
40 | { |
41 | USE_DESKTOP(long long) int status; |
42 | int exitcode = 0; |
43 | unsigned opt; |
44 | |
45 | opt = getopt32(argc, argv, "cftdv"); |
46 | /* if called as zcat */ |
47 | if (strcmp(applet_name, "zcat") == 0) { |
48 | opt |= GUNZIP_OPT_STDOUT; |
49 | } |
50 | |
51 | do { |
52 | struct stat stat_buf; |
53 | char *old_path = argv[optind]; |
54 | char *delete_path = NULL; |
55 | char *new_path = NULL; |
56 | int src_fd; |
57 | int dst_fd; |
58 | |
59 | optind++; |
60 | |
61 | if (old_path == NULL || LONE_DASH(old_path)) { |
62 | src_fd = STDIN_FILENO; |
63 | opt |= GUNZIP_OPT_STDOUT; |
64 | USE_DESKTOP(opt &= ~GUNZIP_OPT_VERBOSE;) |
65 | optind = argc; /* we don't handle "gunzip - a.gz b.gz" */ |
66 | } else { |
67 | src_fd = xopen(old_path, O_RDONLY); |
68 | /* Get the time stamp on the input file. */ |
69 | fstat(src_fd, &stat_buf); |
70 | } |
71 | |
72 | /* Check that the input is sane. */ |
73 | if (isatty(src_fd) && !(opt & GUNZIP_OPT_FORCE)) { |
74 | bb_error_msg_and_die |
75 | ("compressed data not read from terminal, use -f to force it"); |
76 | } |
77 | |
78 | /* Set output filename and number */ |
79 | if (opt & GUNZIP_OPT_TEST) { |
80 | dst_fd = xopen(bb_dev_null, O_WRONLY); /* why does test use filenum 2 ? */ |
81 | } else if (opt & GUNZIP_OPT_STDOUT) { |
82 | dst_fd = STDOUT_FILENO; |
83 | } else { |
84 | char *extension; |
85 | |
86 | new_path = xstrdup(old_path); |
87 | |
88 | extension = strrchr(new_path, '.'); |
89 | #ifdef CONFIG_FEATURE_GUNZIP_UNCOMPRESS |
90 | if (extension && (strcmp(extension, ".Z") == 0)) { |
91 | *extension = '\0'; |
92 | } else |
93 | #endif |
94 | if (extension && (strcmp(extension, ".gz") == 0)) { |
95 | *extension = '\0'; |
96 | } else if (extension && (strcmp(extension, ".tgz") == 0)) { |
97 | extension[2] = 'a'; |
98 | extension[3] = 'r'; |
99 | } else { |
100 | // FIXME: should we die or just skip to next? |
101 | bb_error_msg_and_die("invalid extension"); |
102 | } |
103 | |
104 | /* Open output file (with correct permissions) */ |
105 | dst_fd = xopen3(new_path, O_WRONLY | O_CREAT | O_TRUNC, |
106 | stat_buf.st_mode); |
107 | |
108 | /* If unzip succeeds remove the old file */ |
109 | delete_path = old_path; |
110 | } |
111 | |
112 | status = -1; |
113 | /* do the decompression, and cleanup */ |
114 | if (xread_char(src_fd) == 0x1f) { |
115 | unsigned char magic2; |
116 | |
117 | magic2 = xread_char(src_fd); |
118 | if (ENABLE_FEATURE_GUNZIP_UNCOMPRESS && magic2 == 0x9d) { |
119 | status = uncompress(src_fd, dst_fd); |
120 | } else if (magic2 == 0x8b) { |
121 | check_header_gzip(src_fd); // FIXME: xfunc? _or_die? |
122 | status = inflate_gunzip(src_fd, dst_fd); |
123 | } else { |
124 | bb_error_msg("invalid magic"); |
125 | exitcode = 1; |
126 | } |
127 | if (status < 0) { |
128 | bb_error_msg("error inflating"); |
129 | exitcode = 1; |
130 | } |
131 | else if (ENABLE_DESKTOP && (opt & GUNZIP_OPT_VERBOSE)) { |
132 | fprintf(stderr, "%s: %u%% - replaced with %s\n", |
133 | old_path, (unsigned)(stat_buf.st_size*100 / (status+1)), new_path); |
134 | } |
135 | } else { |
136 | bb_error_msg("invalid magic"); |
137 | exitcode = 1; |
138 | } |
139 | if (status < 0 && new_path) { |
140 | /* Unzip failed, remove new path instead of old path */ |
141 | delete_path = new_path; |
142 | } |
143 | |
144 | if (dst_fd != STDOUT_FILENO) { |
145 | close(dst_fd); |
146 | } |
147 | if (src_fd != STDIN_FILENO) { |
148 | close(src_fd); |
149 | } |
150 | |
151 | /* delete_path will be NULL if in test mode or from stdin */ |
152 | if (delete_path && (unlink(delete_path) == -1)) { |
153 | bb_error_msg("cannot remove %s", delete_path); |
154 | exitcode = 1; |
155 | } |
156 | |
157 | free(new_path); |
158 | |
159 | } while (optind < argc); |
160 | |
161 | return exitcode; |
162 | } |