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-rw-r--r--uuencode.c180
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1/* vi: set sw=4 ts=4: */
2/*
3 * Copyright (C) 2000 by Glenn McGrath
4 *
5 * based on the function base64_encode from http.c in wget v1.6
6 * Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21 */
22#include <getopt.h>
23#include <stdio.h>
24#include <stdlib.h>
25#include <sys/types.h>
26#include <sys/stat.h>
27#include <unistd.h>
28#include "busybox.h"
29
30/* Conversion table. for base 64 */
31static char tbl_base64[64] = {
32 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
33 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
34 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
35 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
36 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
37 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
38 'w', 'x', 'y', 'z', '0', '1', '2', '3',
39 '4', '5', '6', '7', '8', '9', '+', '/'
40};
41
42static char tbl_std[64] = {
43 '`', '!', '"', '#', '$', '%', '&', '\'',
44 '(', ')', '*', '+', ',', '-', '.', '/',
45 '0', '1', '2', '3', '4', '5', '6', '7',
46 '8', '9', ':', ';', '<', '=', '>', '?',
47 '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
48 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
49 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
50 'X', 'Y', 'Z', '[', '\\', ']', '^', '_'
51};
52
53/*
54 * Encode the string S of length LENGTH to base64 format and place it
55 * to STORE. STORE will be 0-terminated, and must point to a writable
56 * buffer of at least 1+BASE64_LENGTH(length) bytes.
57 * where BASE64_LENGTH(len) = (4 * ((LENGTH + 2) / 3))
58 */
59static void uuencode (const char *s, const char *store, const int length, const char *tbl)
60{
61 int i;
62 unsigned char *p = (unsigned char *)store;
63
64 /* Transform the 3x8 bits to 4x6 bits, as required by base64. */
65 for (i = 0; i < length; i += 3) {
66 *p++ = tbl[s[0] >> 2];
67 *p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
68 *p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
69 *p++ = tbl[s[2] & 0x3f];
70 s += 3;
71 }
72 /* Pad the result if necessary... */
73 if (i == length + 1) {
74 *(p - 1) = '=';
75 }
76 else if (i == length + 2) {
77 *(p - 1) = *(p - 2) = '=';
78 }
79 /* ...and zero-terminate it. */
80 *p = '\0';
81}
82
83int uuencode_main(int argc, char **argv)
84{
85 const int src_buf_size = 60; // This *MUST* be a multiple of 3
86 const int dst_buf_size = 4 * ((src_buf_size + 2) / 3);
87 RESERVE_BB_BUFFER(src_buf, src_buf_size + 1);
88 RESERVE_BB_BUFFER(dst_buf, dst_buf_size + 1);
89 struct stat stat_buf;
90 FILE *src_stream = stdin;
91 char *tbl = tbl_std;
92 size_t size;
93 mode_t mode;
94 int opt;
95 int column = 0;
96 int write_size = 0;
97 int remaining;
98 int buffer_offset = 0;
99
100 while ((opt = getopt(argc, argv, "m")) != -1) {
101 switch (opt) {
102 case 'm':
103 tbl = tbl_base64;
104 break;
105 default:
106 show_usage();
107 }
108 }
109
110 switch (argc - optind) {
111 case 2:
112 src_stream = xfopen(argv[optind], "r");
113 stat(argv[optind], &stat_buf);
114 mode = stat_buf.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO);
115 if (src_stream == stdout) {
116 printf("NULL\n");
117 }
118 break;
119 case 1:
120 mode = 0666 & ~umask(0666);
121 break;
122 default:
123 show_usage();
124 }
125
126 printf("begin%s %o %s", tbl == tbl_std ? "" : "-base64", mode, argv[argc - 1]);
127
128 while ((size = fread(src_buf, 1, src_buf_size, src_stream)) > 0) {
129 /* Encode the buffer we just read in */
130 uuencode(src_buf, dst_buf, size, tbl);
131
132 /* Write the buffer to stdout, wrapping at 60 chars.
133 * This looks overly complex, but it gets tricky as
134 * the line has to continue to wrap correctly if we
135 * have to refill the buffer
136 *
137 * Improvments most welcome
138 */
139
140 /* Initialise values for the new buffer */
141 remaining = 4 * ((size + 2) / 3);
142 buffer_offset = 0;
143
144 /* Write the buffer to stdout, wrapping at 60 chars
145 * starting from the column the last buffer ran out
146 */
147 do {
148 if (remaining > (60 - column)) {
149 write_size = 60 - column;
150 }
151 else if (remaining < 60) {
152 write_size = remaining;
153 } else {
154 write_size = 60;
155 }
156
157 /* Setup a new row if required */
158 if (column == 0) {
159 putchar('\n');
160 if (tbl == tbl_std) {
161 putchar('M');
162 }
163 }
164 /* Write to the 60th column */
165 if (fwrite(&dst_buf[buffer_offset], 1, write_size, stdout) != write_size) {
166 perror("Couldnt finish writing");
167 }
168 /* Update variables based on last write */
169 buffer_offset += write_size;
170 remaining -= write_size;
171 column += write_size;
172 if (column % 60 == 0) {
173 column = 0;
174 }
175 } while (remaining > 0);
176 }
177 printf(tbl == tbl_std ? "\n`\nend\n" : "\n====\n");
178
179 return(EXIT_SUCCESS);
180}
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