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