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