1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Copyright 2003, Glenn McGrath <bug1@iinet.net.au>
|
---|
4 | *
|
---|
5 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
---|
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 |
|
---|
15 | #include "libbb.h"
|
---|
16 |
|
---|
17 | static void read_stduu(FILE *src_stream, FILE *dst_stream)
|
---|
18 | {
|
---|
19 | char *line;
|
---|
20 |
|
---|
21 | while ((line = xmalloc_getline(src_stream)) != NULL) {
|
---|
22 | int length;
|
---|
23 | char *line_ptr = line;
|
---|
24 |
|
---|
25 | if (strcmp(line, "end") == 0) {
|
---|
26 | return;
|
---|
27 | }
|
---|
28 | length = ((*line_ptr - 0x20) & 0x3f)* 4 / 3;
|
---|
29 |
|
---|
30 | if (length <= 0) {
|
---|
31 | /* Ignore the "`\n" line, why is it even in the encode file ? */
|
---|
32 | continue;
|
---|
33 | }
|
---|
34 | if (length > 60) {
|
---|
35 | bb_error_msg_and_die("line too long");
|
---|
36 | }
|
---|
37 |
|
---|
38 | line_ptr++;
|
---|
39 | /* Tolerate an overly long line to accomodate a possible exta '`' */
|
---|
40 | if (strlen(line_ptr) < (size_t)length) {
|
---|
41 | bb_error_msg_and_die("short file");
|
---|
42 | }
|
---|
43 |
|
---|
44 | while (length > 0) {
|
---|
45 | /* Merge four 6 bit chars to three 8 bit chars */
|
---|
46 | fputc(((line_ptr[0] - 0x20) & 077) << 2 | ((line_ptr[1] - 0x20) & 077) >> 4, dst_stream);
|
---|
47 | line_ptr++;
|
---|
48 | length--;
|
---|
49 | if (length == 0) {
|
---|
50 | break;
|
---|
51 | }
|
---|
52 |
|
---|
53 | fputc(((line_ptr[0] - 0x20) & 077) << 4 | ((line_ptr[1] - 0x20) & 077) >> 2, dst_stream);
|
---|
54 | line_ptr++;
|
---|
55 | length--;
|
---|
56 | if (length == 0) {
|
---|
57 | break;
|
---|
58 | }
|
---|
59 |
|
---|
60 | fputc(((line_ptr[0] - 0x20) & 077) << 6 | ((line_ptr[1] - 0x20) & 077), dst_stream);
|
---|
61 | line_ptr += 2;
|
---|
62 | length -= 2;
|
---|
63 | }
|
---|
64 | free(line);
|
---|
65 | }
|
---|
66 | bb_error_msg_and_die("short file");
|
---|
67 | }
|
---|
68 |
|
---|
69 | static void read_base64(FILE *src_stream, FILE *dst_stream)
|
---|
70 | {
|
---|
71 | int term_count = 1;
|
---|
72 |
|
---|
73 | while (1) {
|
---|
74 | char translated[4];
|
---|
75 | int count = 0;
|
---|
76 |
|
---|
77 | while (count < 4) {
|
---|
78 | char *table_ptr;
|
---|
79 | int ch;
|
---|
80 |
|
---|
81 | /* Get next _valid_ character.
|
---|
82 | * global vector bb_uuenc_tbl_base64[] contains this string:
|
---|
83 | * "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"
|
---|
84 | */
|
---|
85 | do {
|
---|
86 | ch = fgetc(src_stream);
|
---|
87 | if (ch == EOF) {
|
---|
88 | bb_error_msg_and_die("short file");
|
---|
89 | }
|
---|
90 | table_ptr = strchr(bb_uuenc_tbl_base64, ch);
|
---|
91 | } while (table_ptr == NULL);
|
---|
92 |
|
---|
93 | /* Convert encoded character to decimal */
|
---|
94 | ch = table_ptr - bb_uuenc_tbl_base64;
|
---|
95 |
|
---|
96 | if (*table_ptr == '=') {
|
---|
97 | if (term_count == 0) {
|
---|
98 | translated[count] = '\0';
|
---|
99 | break;
|
---|
100 | }
|
---|
101 | term_count++;
|
---|
102 | } else if (*table_ptr == '\n') {
|
---|
103 | /* Check for terminating line */
|
---|
104 | if (term_count == 5) {
|
---|
105 | return;
|
---|
106 | }
|
---|
107 | term_count = 1;
|
---|
108 | continue;
|
---|
109 | } else {
|
---|
110 | translated[count] = ch;
|
---|
111 | count++;
|
---|
112 | term_count = 0;
|
---|
113 | }
|
---|
114 | }
|
---|
115 |
|
---|
116 | /* Merge 6 bit chars to 8 bit */
|
---|
117 | if (count > 1) {
|
---|
118 | fputc(translated[0] << 2 | translated[1] >> 4, dst_stream);
|
---|
119 | }
|
---|
120 | if (count > 2) {
|
---|
121 | fputc(translated[1] << 4 | translated[2] >> 2, dst_stream);
|
---|
122 | }
|
---|
123 | if (count > 3) {
|
---|
124 | fputc(translated[2] << 6 | translated[3], dst_stream);
|
---|
125 | }
|
---|
126 | }
|
---|
127 | }
|
---|
128 |
|
---|
129 | int uudecode_main(int argc, char **argv);
|
---|
130 | int uudecode_main(int argc, char **argv)
|
---|
131 | {
|
---|
132 | FILE *src_stream = stdin;
|
---|
133 | char *outname = NULL;
|
---|
134 | char *line;
|
---|
135 |
|
---|
136 | opt_complementary = "?1"; /* 1 argument max */
|
---|
137 | getopt32(argv, "o:", &outname);
|
---|
138 | argv += optind;
|
---|
139 |
|
---|
140 | if (argv[0])
|
---|
141 | src_stream = xfopen(argv[0], "r");
|
---|
142 |
|
---|
143 | /* Search for the start of the encoding */
|
---|
144 | while ((line = xmalloc_getline(src_stream)) != NULL) {
|
---|
145 | void (*decode_fn_ptr)(FILE * src, FILE * dst);
|
---|
146 | char *line_ptr;
|
---|
147 | FILE *dst_stream;
|
---|
148 | int mode;
|
---|
149 |
|
---|
150 | if (strncmp(line, "begin-base64 ", 13) == 0) {
|
---|
151 | line_ptr = line + 13;
|
---|
152 | decode_fn_ptr = read_base64;
|
---|
153 | } else if (strncmp(line, "begin ", 6) == 0) {
|
---|
154 | line_ptr = line + 6;
|
---|
155 | decode_fn_ptr = read_stduu;
|
---|
156 | } else {
|
---|
157 | free(line);
|
---|
158 | continue;
|
---|
159 | }
|
---|
160 |
|
---|
161 | /* begin line found. decode and exit */
|
---|
162 | mode = strtoul(line_ptr, NULL, 8);
|
---|
163 | if (outname == NULL) {
|
---|
164 | outname = strchr(line_ptr, ' ');
|
---|
165 | if ((outname == NULL) || (*outname == '\0')) {
|
---|
166 | break;
|
---|
167 | }
|
---|
168 | outname++;
|
---|
169 | }
|
---|
170 | dst_stream = stdout;
|
---|
171 | if (NOT_LONE_DASH(outname)) {
|
---|
172 | dst_stream = xfopen(outname, "w");
|
---|
173 | chmod(outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO));
|
---|
174 | }
|
---|
175 | free(line);
|
---|
176 | decode_fn_ptr(src_stream, dst_stream);
|
---|
177 | /* fclose_if_not_stdin(src_stream); - redundant */
|
---|
178 | return EXIT_SUCCESS;
|
---|
179 | }
|
---|
180 | bb_error_msg_and_die("no 'begin' line");
|
---|
181 | }
|
---|
182 |
|
---|
183 | /* Test script.
|
---|
184 | Put this into an empty dir with busybox binary, an run.
|
---|
185 |
|
---|
186 | #!/bin/sh
|
---|
187 | test -x busybox || { echo "No ./busybox?"; exit; }
|
---|
188 | ln -sf busybox uudecode
|
---|
189 | ln -sf busybox uuencode
|
---|
190 | >A_null
|
---|
191 | echo -n A >A
|
---|
192 | echo -n AB >AB
|
---|
193 | echo -n ABC >ABC
|
---|
194 | echo -n ABCD >ABCD
|
---|
195 | echo -n ABCDE >ABCDE
|
---|
196 | echo -n ABCDEF >ABCDEF
|
---|
197 | cat busybox >A_bbox
|
---|
198 | for f in A*; do
|
---|
199 | echo uuencode $f
|
---|
200 | ./uuencode $f <$f >u_$f
|
---|
201 | ./uuencode -m $f <$f >m_$f
|
---|
202 | done
|
---|
203 | mkdir unpk_u unpk_m 2>/dev/null
|
---|
204 | for f in u_*; do
|
---|
205 | ./uudecode <$f -o unpk_u/${f:2}
|
---|
206 | diff -a ${f:2} unpk_u/${f:2} >/dev/null 2>&1
|
---|
207 | echo uudecode $f: $?
|
---|
208 | done
|
---|
209 | for f in m_*; do
|
---|
210 | ./uudecode <$f -o unpk_m/${f:2}
|
---|
211 | diff -a ${f:2} unpk_m/${f:2} >/dev/null 2>&1
|
---|
212 | echo uudecode $f: $?
|
---|
213 | done
|
---|
214 | */
|
---|