blob: ddce2548b87b7b77dd546ef602e46c7b365e3e1d
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Copyright 2003, Glenn McGrath |
4 | * |
5 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
6 | * |
7 | * Based on specification from |
8 | * http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html |
9 | * |
10 | * Bugs: the spec doesn't mention anything about "`\n`\n" prior to the |
11 | * "end" line |
12 | */ |
13 | //config:config UUDECODE |
14 | //config: bool "uudecode" |
15 | //config: default y |
16 | //config: help |
17 | //config: uudecode is used to decode a uuencoded file. |
18 | |
19 | //applet:IF_UUDECODE(APPLET(uudecode, BB_DIR_USR_BIN, BB_SUID_DROP)) |
20 | |
21 | //kbuild:lib-$(CONFIG_UUDECODE) += uudecode.o |
22 | |
23 | //usage:#define uudecode_trivial_usage |
24 | //usage: "[-o OUTFILE] [INFILE]" |
25 | //usage:#define uudecode_full_usage "\n\n" |
26 | //usage: "Uudecode a file\n" |
27 | //usage: "Finds OUTFILE in uuencoded source unless -o is given" |
28 | //usage: |
29 | //usage:#define uudecode_example_usage |
30 | //usage: "$ uudecode -o busybox busybox.uu\n" |
31 | //usage: "$ ls -l busybox\n" |
32 | //usage: "-rwxr-xr-x 1 ams ams 245264 Jun 7 21:35 busybox\n" |
33 | |
34 | #include "libbb.h" |
35 | |
36 | #if ENABLE_UUDECODE |
37 | static void FAST_FUNC read_stduu(FILE *src_stream, FILE *dst_stream, int flags UNUSED_PARAM) |
38 | { |
39 | char *line; |
40 | |
41 | for (;;) { |
42 | int encoded_len, str_len; |
43 | char *line_ptr, *dst; |
44 | size_t line_len; |
45 | |
46 | line_len = 64 * 1024; |
47 | line = xmalloc_fgets_str_len(src_stream, "\n", &line_len); |
48 | if (!line) |
49 | break; |
50 | /* Handle both Unix and MSDOS text, and stray trailing spaces */ |
51 | str_len = line_len; |
52 | while (--str_len >= 0 && isspace(line[str_len])) |
53 | line[str_len] = '\0'; |
54 | |
55 | if (strcmp(line, "end") == 0) { |
56 | return; /* the only non-error exit */ |
57 | } |
58 | |
59 | line_ptr = line; |
60 | while (*line_ptr) { |
61 | *line_ptr = (*line_ptr - 0x20) & 0x3f; |
62 | line_ptr++; |
63 | } |
64 | str_len = line_ptr - line; |
65 | |
66 | encoded_len = line[0] * 4 / 3; |
67 | /* Check that line is not too short. (we tolerate |
68 | * overly _long_ line to accommodate possible extra '`'). |
69 | * Empty line case is also caught here. */ |
70 | if (str_len <= encoded_len) { |
71 | break; /* go to bb_error_msg_and_die("short file"); */ |
72 | } |
73 | if (encoded_len <= 0) { |
74 | /* Ignore the "`\n" line, why is it even in the encode file ? */ |
75 | free(line); |
76 | continue; |
77 | } |
78 | if (encoded_len > 60) { |
79 | bb_error_msg_and_die("line too long"); |
80 | } |
81 | |
82 | dst = line; |
83 | line_ptr = line + 1; |
84 | do { |
85 | /* Merge four 6 bit chars to three 8 bit chars */ |
86 | *dst++ = line_ptr[0] << 2 | line_ptr[1] >> 4; |
87 | encoded_len--; |
88 | if (encoded_len == 0) { |
89 | break; |
90 | } |
91 | |
92 | *dst++ = line_ptr[1] << 4 | line_ptr[2] >> 2; |
93 | encoded_len--; |
94 | if (encoded_len == 0) { |
95 | break; |
96 | } |
97 | |
98 | *dst++ = line_ptr[2] << 6 | line_ptr[3]; |
99 | line_ptr += 4; |
100 | encoded_len -= 2; |
101 | } while (encoded_len > 0); |
102 | fwrite(line, 1, dst - line, dst_stream); |
103 | free(line); |
104 | } |
105 | bb_error_msg_and_die("short file"); |
106 | } |
107 | #endif |
108 | |
109 | #if ENABLE_UUDECODE |
110 | int uudecode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
111 | int uudecode_main(int argc UNUSED_PARAM, char **argv) |
112 | { |
113 | FILE *src_stream; |
114 | char *outname = NULL; |
115 | char *line; |
116 | |
117 | opt_complementary = "?1"; /* 1 argument max */ |
118 | getopt32(argv, "o:", &outname); |
119 | argv += optind; |
120 | |
121 | if (!argv[0]) |
122 | *--argv = (char*)"-"; |
123 | src_stream = xfopen_stdin(argv[0]); |
124 | |
125 | /* Search for the start of the encoding */ |
126 | while ((line = xmalloc_fgetline(src_stream)) != NULL) { |
127 | void FAST_FUNC (*decode_fn_ptr)(FILE *src, FILE *dst, int flags); |
128 | char *line_ptr; |
129 | FILE *dst_stream; |
130 | int mode; |
131 | |
132 | if (is_prefixed_with(line, "begin-base64 ")) { |
133 | line_ptr = line + 13; |
134 | decode_fn_ptr = read_base64; |
135 | } else if (is_prefixed_with(line, "begin ")) { |
136 | line_ptr = line + 6; |
137 | decode_fn_ptr = read_stduu; |
138 | } else { |
139 | free(line); |
140 | continue; |
141 | } |
142 | |
143 | /* begin line found. decode and exit */ |
144 | mode = bb_strtou(line_ptr, NULL, 8); |
145 | if (outname == NULL) { |
146 | outname = strchr(line_ptr, ' '); |
147 | if (!outname) |
148 | break; |
149 | outname++; |
150 | trim(outname); /* remove trailing space (and '\r' for DOS text) */ |
151 | if (!outname[0]) |
152 | break; |
153 | } |
154 | dst_stream = stdout; |
155 | if (NOT_LONE_DASH(outname)) { |
156 | dst_stream = xfopen_for_write(outname); |
157 | fchmod(fileno(dst_stream), mode & (S_IRWXU | S_IRWXG | S_IRWXO)); |
158 | } |
159 | free(line); |
160 | decode_fn_ptr(src_stream, dst_stream, /*flags:*/ BASE64_FLAG_UU_STOP + BASE64_FLAG_NO_STOP_CHAR); |
161 | /* fclose_if_not_stdin(src_stream); - redundant */ |
162 | return EXIT_SUCCESS; |
163 | } |
164 | bb_error_msg_and_die("no 'begin' line"); |
165 | } |
166 | #endif |
167 | |
168 | //applet:IF_BASE64(APPLET(base64, BB_DIR_BIN, BB_SUID_DROP)) |
169 | |
170 | //kbuild:lib-$(CONFIG_BASE64) += uudecode.o |
171 | |
172 | //config:config BASE64 |
173 | //config: bool "base64" |
174 | //config: default y |
175 | //config: help |
176 | //config: Base64 encode and decode |
177 | |
178 | //usage:#define base64_trivial_usage |
179 | //usage: "[-d] [FILE]" |
180 | //usage:#define base64_full_usage "\n\n" |
181 | //usage: "Base64 encode or decode FILE to standard output" |
182 | //usage: "\n -d Decode data" |
183 | ////usage: "\n -w COL Wrap lines at COL (default 76, 0 disables)" |
184 | ////usage: "\n -i When decoding, ignore non-alphabet characters" |
185 | |
186 | #if ENABLE_BASE64 |
187 | int base64_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
188 | int base64_main(int argc UNUSED_PARAM, char **argv) |
189 | { |
190 | FILE *src_stream; |
191 | unsigned opts; |
192 | |
193 | opt_complementary = "?1"; /* 1 argument max */ |
194 | opts = getopt32(argv, "d"); |
195 | argv += optind; |
196 | |
197 | if (!argv[0]) |
198 | *--argv = (char*)"-"; |
199 | src_stream = xfopen_stdin(argv[0]); |
200 | if (opts) { |
201 | read_base64(src_stream, stdout, /*flags:*/ (char)EOF); |
202 | } else { |
203 | enum { |
204 | SRC_BUF_SIZE = 76/4*3, /* This *MUST* be a multiple of 3 */ |
205 | DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3), |
206 | }; |
207 | char src_buf[SRC_BUF_SIZE]; |
208 | char dst_buf[DST_BUF_SIZE + 1]; |
209 | int src_fd = fileno(src_stream); |
210 | while (1) { |
211 | size_t size = full_read(src_fd, src_buf, SRC_BUF_SIZE); |
212 | if (!size) |
213 | break; |
214 | if ((ssize_t)size < 0) |
215 | bb_perror_msg_and_die(bb_msg_read_error); |
216 | /* Encode the buffer we just read in */ |
217 | bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64); |
218 | xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3)); |
219 | bb_putchar('\n'); |
220 | fflush(stdout); |
221 | } |
222 | } |
223 | |
224 | fflush_stdout_and_exit(EXIT_SUCCESS); |
225 | } |
226 | #endif |
227 | |
228 | /* Test script. |
229 | Put this into an empty dir with busybox binary, an run. |
230 | |
231 | #!/bin/sh |
232 | test -x busybox || { echo "No ./busybox?"; exit; } |
233 | ln -sf busybox uudecode |
234 | ln -sf busybox uuencode |
235 | >A_null |
236 | echo -n A >A |
237 | echo -n AB >AB |
238 | echo -n ABC >ABC |
239 | echo -n ABCD >ABCD |
240 | echo -n ABCDE >ABCDE |
241 | echo -n ABCDEF >ABCDEF |
242 | cat busybox >A_bbox |
243 | for f in A*; do |
244 | echo uuencode $f |
245 | ./uuencode $f <$f >u_$f |
246 | ./uuencode -m $f <$f >m_$f |
247 | done |
248 | mkdir unpk_u unpk_m 2>/dev/null |
249 | for f in u_*; do |
250 | ./uudecode <$f -o unpk_u/${f:2} |
251 | diff -a ${f:2} unpk_u/${f:2} >/dev/null 2>&1 |
252 | echo uudecode $f: $? |
253 | done |
254 | for f in m_*; do |
255 | ./uudecode <$f -o unpk_m/${f:2} |
256 | diff -a ${f:2} unpk_m/${f:2} >/dev/null 2>&1 |
257 | echo uudecode $f: $? |
258 | done |
259 | */ |
260 |