1 | /*
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2 | * Copyright 2003, Glenn McGrath <bug1@iinet.net.au>
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3 | *
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4 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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5 | *
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6 | * Based on specification from
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7 | * http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html
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8 | *
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9 | * Bugs: the spec doesn't mention anything about "`\n`\n" prior to the
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10 | * "end" line
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11 | */
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12 |
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13 |
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14 | #include <stdio.h>
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15 | #include <errno.h>
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16 | #include <getopt.h> /* optind */
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17 | #include <string.h>
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18 | #include <stdlib.h>
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19 | #include "busybox.h"
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20 |
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21 | static int read_stduu(FILE *src_stream, FILE *dst_stream)
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22 | {
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23 | char *line;
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24 |
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25 | while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) {
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26 | int length;
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27 | char *line_ptr = line;
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28 |
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29 | if (strcmp(line, "end") == 0) {
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30 | return(EXIT_SUCCESS);
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31 | }
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32 | length = ((*line_ptr - 0x20) & 0x3f)* 4 / 3;
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33 |
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34 | if (length <= 0) {
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35 | /* Ignore the "`\n" line, why is it even in the encode file ? */
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36 | continue;
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37 | }
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38 | if (length > 60) {
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39 | bb_error_msg_and_die("Line too long");
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40 | }
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41 |
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42 | line_ptr++;
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43 | /* Tolerate an overly long line to acomadate a possible exta '`' */
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44 | if (strlen(line_ptr) < (size_t)length) {
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45 | bb_error_msg_and_die("Short file");
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46 | }
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47 |
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48 | while (length > 0) {
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49 | /* Merge four 6 bit chars to three 8 bit chars */
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50 | fputc(((line_ptr[0] - 0x20) & 077) << 2 | ((line_ptr[1] - 0x20) & 077) >> 4, dst_stream);
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51 | line_ptr++;
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52 | length--;
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53 | if (length == 0) {
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54 | break;
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55 | }
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56 |
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57 | fputc(((line_ptr[0] - 0x20) & 077) << 4 | ((line_ptr[1] - 0x20) & 077) >> 2, dst_stream);
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58 | line_ptr++;
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59 | length--;
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60 | if (length == 0) {
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61 | break;
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62 | }
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63 |
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64 | fputc(((line_ptr[0] - 0x20) & 077) << 6 | ((line_ptr[1] - 0x20) & 077), dst_stream);
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65 | line_ptr += 2;
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66 | length -= 2;
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67 | }
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68 | free(line);
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69 | }
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70 | bb_error_msg_and_die("Short file");
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71 | }
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72 |
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73 | static int read_base64(FILE *src_stream, FILE *dst_stream)
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74 | {
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75 | static const char base64_table[] =
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76 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n";
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77 | char term_count = 0;
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78 |
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79 | while (1) {
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80 | char translated[4];
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81 | int count = 0;
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82 |
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83 | while (count < 4) {
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84 | char *table_ptr;
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85 | int ch;
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86 |
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87 | /* Get next _valid_ character */
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88 | do {
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89 | ch = fgetc(src_stream);
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90 | if (ch == EOF) {
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91 | bb_error_msg_and_die("Short file");
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92 | }
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93 | } while ((table_ptr = strchr(base64_table, ch)) == NULL);
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94 |
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95 | /* Convert encoded charcter to decimal */
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96 | ch = table_ptr - base64_table;
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97 |
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98 | if (*table_ptr == '=') {
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99 | if (term_count == 0) {
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100 | translated[count] = 0;
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101 | break;
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102 | }
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103 | term_count++;
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104 | }
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105 | else if (*table_ptr == '\n') {
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106 | /* Check for terminating line */
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107 | if (term_count == 5) {
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108 | return(EXIT_SUCCESS);
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109 | }
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110 | term_count = 1;
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111 | continue;
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112 | } else {
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113 | translated[count] = ch;
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114 | count++;
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115 | term_count = 0;
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116 | }
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117 | }
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118 |
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119 | /* Merge 6 bit chars to 8 bit */
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120 | fputc(translated[0] << 2 | translated[1] >> 4, dst_stream);
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121 | if (count > 2) {
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122 | fputc(translated[1] << 4 | translated[2] >> 2, dst_stream);
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123 | }
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124 | if (count > 3) {
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125 | fputc(translated[2] << 6 | translated[3], dst_stream);
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126 | }
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127 | }
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128 | }
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129 |
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130 | int uudecode_main(int argc, char **argv)
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131 | {
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132 | int (*decode_fn_ptr) (FILE * src, FILE * dst);
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133 | FILE *src_stream;
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134 | char *outname = NULL;
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135 | char *line;
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136 | int opt;
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137 |
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138 | opt = bb_getopt_ulflags(argc, argv, "o:", &outname);
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139 |
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140 | if (optind == argc) {
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141 | src_stream = stdin;
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142 | } else if (optind + 1 == argc) {
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143 | src_stream = bb_xfopen(argv[optind], "r");
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144 | } else {
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145 | bb_show_usage();
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146 | }
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147 |
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148 | /* Search for the start of the encoding */
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149 | while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) {
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150 | char *line_ptr = NULL;
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151 |
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152 | if (line == NULL) {
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153 | break;
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154 | } else if (strncmp(line, "begin-base64 ", 13) == 0) {
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155 | line_ptr = line + 13;
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156 | decode_fn_ptr = read_base64;
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157 | } else if (strncmp(line, "begin ", 6) == 0) {
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158 | line_ptr = line + 6;
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159 | decode_fn_ptr = read_stduu;
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160 | }
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161 |
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162 | if (line_ptr) {
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163 | FILE *dst_stream;
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164 | int mode;
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165 | int ret;
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166 |
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167 | mode = strtoul(line_ptr, NULL, 8);
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168 | if (outname == NULL) {
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169 | outname = strchr(line_ptr, ' ');
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170 | if ((outname == NULL) || (*outname == '\0')) {
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171 | break;
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172 | }
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173 | outname++;
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174 | }
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175 | if (strcmp(outname, "-") == 0) {
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176 | dst_stream = stdout;
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177 | } else {
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178 | dst_stream = bb_xfopen(outname, "w");
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179 | chmod(outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO));
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180 | }
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181 | free(line);
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182 | ret = decode_fn_ptr(src_stream, dst_stream);
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183 | bb_fclose_nonstdin(src_stream);
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184 | return(ret);
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185 | }
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186 | free(line);
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187 | }
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188 | bb_error_msg_and_die("No `begin' line");
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189 | }
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