blob: b298fcb9535207e27f4b4d1c3c8e69c2435e3307
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 | |
14 | //usage:#define uudecode_trivial_usage |
15 | //usage: "[-o OUTFILE] [INFILE]" |
16 | //usage:#define uudecode_full_usage "\n\n" |
17 | //usage: "Uudecode a file\n" |
18 | //usage: "Finds OUTFILE in uuencoded source unless -o is given" |
19 | //usage: |
20 | //usage:#define uudecode_example_usage |
21 | //usage: "$ uudecode -o busybox busybox.uu\n" |
22 | //usage: "$ ls -l busybox\n" |
23 | //usage: "-rwxr-xr-x 1 ams ams 245264 Jun 7 21:35 busybox\n" |
24 | |
25 | #include "libbb.h" |
26 | |
27 | #if ENABLE_UUDECODE |
28 | static void FAST_FUNC read_stduu(FILE *src_stream, FILE *dst_stream, int flags UNUSED_PARAM) |
29 | { |
30 | char *line; |
31 | |
32 | while ((line = xmalloc_fgetline(src_stream)) != NULL) { |
33 | int encoded_len, str_len; |
34 | char *line_ptr, *dst; |
35 | |
36 | if (strcmp(line, "end") == 0) { |
37 | return; /* the only non-error exit */ |
38 | } |
39 | |
40 | line_ptr = line; |
41 | while (*line_ptr) { |
42 | *line_ptr = (*line_ptr - 0x20) & 0x3f; |
43 | line_ptr++; |
44 | } |
45 | str_len = line_ptr - line; |
46 | |
47 | encoded_len = line[0] * 4 / 3; |
48 | /* Check that line is not too short. (we tolerate |
49 | * overly _long_ line to accomodate possible extra '`'). |
50 | * Empty line case is also caught here. */ |
51 | if (str_len <= encoded_len) { |
52 | break; /* go to bb_error_msg_and_die("short file"); */ |
53 | } |
54 | if (encoded_len <= 0) { |
55 | /* Ignore the "`\n" line, why is it even in the encode file ? */ |
56 | free(line); |
57 | continue; |
58 | } |
59 | if (encoded_len > 60) { |
60 | bb_error_msg_and_die("line too long"); |
61 | } |
62 | |
63 | dst = line; |
64 | line_ptr = line + 1; |
65 | do { |
66 | /* Merge four 6 bit chars to three 8 bit chars */ |
67 | *dst++ = line_ptr[0] << 2 | line_ptr[1] >> 4; |
68 | encoded_len--; |
69 | if (encoded_len == 0) { |
70 | break; |
71 | } |
72 | |
73 | *dst++ = line_ptr[1] << 4 | line_ptr[2] >> 2; |
74 | encoded_len--; |
75 | if (encoded_len == 0) { |
76 | break; |
77 | } |
78 | |
79 | *dst++ = line_ptr[2] << 6 | line_ptr[3]; |
80 | line_ptr += 4; |
81 | encoded_len -= 2; |
82 | } while (encoded_len > 0); |
83 | fwrite(line, 1, dst - line, dst_stream); |
84 | free(line); |
85 | } |
86 | bb_error_msg_and_die("short file"); |
87 | } |
88 | #endif |
89 | |
90 | #if ENABLE_UUDECODE |
91 | int uudecode_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
92 | int uudecode_main(int argc UNUSED_PARAM, char **argv) |
93 | { |
94 | FILE *src_stream; |
95 | char *outname = NULL; |
96 | char *line; |
97 | |
98 | opt_complementary = "?1"; /* 1 argument max */ |
99 | getopt32(argv, "o:", &outname); |
100 | argv += optind; |
101 | |
102 | if (!argv[0]) |
103 | *--argv = (char*)"-"; |
104 | src_stream = xfopen_stdin(argv[0]); |
105 | |
106 | /* Search for the start of the encoding */ |
107 | while ((line = xmalloc_fgetline(src_stream)) != NULL) { |
108 | void FAST_FUNC (*decode_fn_ptr)(FILE *src, FILE *dst, int flags); |
109 | char *line_ptr; |
110 | FILE *dst_stream; |
111 | int mode; |
112 | |
113 | if (strncmp(line, "begin-base64 ", 13) == 0) { |
114 | line_ptr = line + 13; |
115 | decode_fn_ptr = read_base64; |
116 | } else if (strncmp(line, "begin ", 6) == 0) { |
117 | line_ptr = line + 6; |
118 | decode_fn_ptr = read_stduu; |
119 | } else { |
120 | free(line); |
121 | continue; |
122 | } |
123 | |
124 | /* begin line found. decode and exit */ |
125 | mode = bb_strtou(line_ptr, NULL, 8); |
126 | if (outname == NULL) { |
127 | outname = strchr(line_ptr, ' '); |
128 | if (!outname) |
129 | break; |
130 | outname++; |
131 | if (!outname[0]) |
132 | break; |
133 | } |
134 | dst_stream = stdout; |
135 | if (NOT_LONE_DASH(outname)) { |
136 | dst_stream = xfopen_for_write(outname); |
137 | fchmod(fileno(dst_stream), mode & (S_IRWXU | S_IRWXG | S_IRWXO)); |
138 | } |
139 | free(line); |
140 | decode_fn_ptr(src_stream, dst_stream, /*flags:*/ BASE64_FLAG_UU_STOP + BASE64_FLAG_NO_STOP_CHAR); |
141 | /* fclose_if_not_stdin(src_stream); - redundant */ |
142 | return EXIT_SUCCESS; |
143 | } |
144 | bb_error_msg_and_die("no 'begin' line"); |
145 | } |
146 | #endif |
147 | |
148 | //applet:IF_BASE64(APPLET(base64, BB_DIR_BIN, BB_SUID_DROP)) |
149 | |
150 | //kbuild:lib-$(CONFIG_BASE64) += uudecode.o |
151 | |
152 | //config:config BASE64 |
153 | //config: bool "base64" |
154 | //config: default y |
155 | //config: help |
156 | //config: Base64 encode and decode |
157 | |
158 | //usage:#define base64_trivial_usage |
159 | //usage: "[-d] [FILE]" |
160 | //usage:#define base64_full_usage "\n\n" |
161 | //usage: "Base64 encode or decode FILE to standard output" |
162 | //usage: "\n -d Decode data" |
163 | ////usage: "\n -w COL Wrap lines at COL (default 76, 0 disables)" |
164 | ////usage: "\n -i When decoding, ignore non-alphabet characters" |
165 | |
166 | #if ENABLE_BASE64 |
167 | int base64_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
168 | int base64_main(int argc UNUSED_PARAM, char **argv) |
169 | { |
170 | FILE *src_stream; |
171 | unsigned opts; |
172 | |
173 | opt_complementary = "?1"; /* 1 argument max */ |
174 | opts = getopt32(argv, "d"); |
175 | argv += optind; |
176 | |
177 | if (!argv[0]) |
178 | *--argv = (char*)"-"; |
179 | src_stream = xfopen_stdin(argv[0]); |
180 | if (opts) { |
181 | read_base64(src_stream, stdout, /*flags:*/ (char)EOF); |
182 | } else { |
183 | enum { |
184 | SRC_BUF_SIZE = 76/4*3, /* This *MUST* be a multiple of 3 */ |
185 | DST_BUF_SIZE = 4 * ((SRC_BUF_SIZE + 2) / 3), |
186 | }; |
187 | char src_buf[SRC_BUF_SIZE]; |
188 | char dst_buf[DST_BUF_SIZE + 1]; |
189 | int src_fd = fileno(src_stream); |
190 | while (1) { |
191 | size_t size = full_read(src_fd, src_buf, SRC_BUF_SIZE); |
192 | if (!size) |
193 | break; |
194 | if ((ssize_t)size < 0) |
195 | bb_perror_msg_and_die(bb_msg_read_error); |
196 | /* Encode the buffer we just read in */ |
197 | bb_uuencode(dst_buf, src_buf, size, bb_uuenc_tbl_base64); |
198 | xwrite(STDOUT_FILENO, dst_buf, 4 * ((size + 2) / 3)); |
199 | bb_putchar('\n'); |
200 | fflush(stdout); |
201 | } |
202 | } |
203 | |
204 | fflush_stdout_and_exit(EXIT_SUCCESS); |
205 | } |
206 | #endif |
207 | |
208 | /* Test script. |
209 | Put this into an empty dir with busybox binary, an run. |
210 | |
211 | #!/bin/sh |
212 | test -x busybox || { echo "No ./busybox?"; exit; } |
213 | ln -sf busybox uudecode |
214 | ln -sf busybox uuencode |
215 | >A_null |
216 | echo -n A >A |
217 | echo -n AB >AB |
218 | echo -n ABC >ABC |
219 | echo -n ABCD >ABCD |
220 | echo -n ABCDE >ABCDE |
221 | echo -n ABCDEF >ABCDEF |
222 | cat busybox >A_bbox |
223 | for f in A*; do |
224 | echo uuencode $f |
225 | ./uuencode $f <$f >u_$f |
226 | ./uuencode -m $f <$f >m_$f |
227 | done |
228 | mkdir unpk_u unpk_m 2>/dev/null |
229 | for f in u_*; do |
230 | ./uudecode <$f -o unpk_u/${f:2} |
231 | diff -a ${f:2} unpk_u/${f:2} >/dev/null 2>&1 |
232 | echo uudecode $f: $? |
233 | done |
234 | for f in m_*; do |
235 | ./uudecode <$f -o unpk_m/${f:2} |
236 | diff -a ${f:2} unpk_m/${f:2} >/dev/null 2>&1 |
237 | echo uudecode $f: $? |
238 | done |
239 | */ |
240 |