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annotate toys/pending/uudecode.c @ 823:0429050a224b

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uuencode and uudecode by Erich Plondke.
author Rob Landley <rob@landley.net>
date Mon, 18 Mar 2013 09:11:21 -0500
parents
children 1fdaba9a7124
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823
0429050a224b uuencode and uudecode by Erich Plondke.
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1 /* uudecode.c - uudecode / base64 decode
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2 *
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3 * Copyright 2013 Erich Plondke <toybox@erich.wreck.org>
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4 *
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5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/uudecode.html
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6
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7 USE_UUENCODE(NEWTOY(uudecode, ">2o:", TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config UUDECODE
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10 bool "uudecode"
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11 default n
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12 help
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13 usage: uudecode [-o outfile] [file]
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14
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15 Uudecode or base64-decode stdin or [file], sending output to outfile or
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16 filename specified by input.
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17 */
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18
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19 #define FOR_uudecode
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20 #include "toys.h"
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21
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22 GLOBALS(
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23 char *o;
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24 )
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25
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26 /*
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27 * Turn a character back into a value.
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28 * The smallest valid character is 0x2B ('+')
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29 * The biggest valid character is 0x7A ('z')
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30 * We can make a table of 16*5 entries to cover 0x2B - 0x7A
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31 */
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32
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33 static inline int startswith(const char *a, const char *b)
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34 {
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35 return (0==strncmp(a,b,strlen(b)));
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36 }
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37
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38 static inline signed char uudecode_b64_1byte(char in)
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39 {
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40 char ret;
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41 static const signed char table[16*5] = {
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42 /* '+' (0x2B) is 62, '/'(0x2F) is 63, rest invalid */
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43 62, -1, -1, -1, 63,
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44 /* '0'-'9' are values 52-61, rest of 0x3A - 0x3F is invalid, = is special... */
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45 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
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46 /* '@' is invalid, 'A'-'Z' are values 0-25, 0x5b - 0x5F are invalid */
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47 -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
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48 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
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49 /* '`' is invalid, 'a'-'z' are values 26-51, 0x7B - 0x7F are invalid */
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50 -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
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51 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
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52 };
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53 in &= 0x7f;
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54 if (in < '+') return -1;
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55 if (in > 'z') return -1;
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56 in -= '+';
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57 ret = table[in];
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58 return ret;
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59 };
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60
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61
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62 /* Returns length put in out */
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63 static int uudecode_b64_4bytes(char *out, const char *in)
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64 {
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65 unsigned int i,x=0;
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66 signed char b0,b1,b2,b3;
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67 int len = 3;
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68 b0 = uudecode_b64_1byte(in[0]);
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69 b1 = uudecode_b64_1byte(in[1]);
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70 b2 = uudecode_b64_1byte(in[2]);
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71 b3 = uudecode_b64_1byte(in[3]);
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72 if ((b1 < 0) || (b0 < 0)) return 0;
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73 if (b3 < 0) len--;
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74 if (b2 < 0) len--;
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75 x = ((b0 & 0x3f)<<18) | ((b1 & 0x3f)<<12) | ((b2 & 0x3f) << 6) | (b3 & 0x3f);
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76 for (i = 0; i < len; i++) {
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77 *out++ = (x>>(8*(2-i))) & 0x0ff;
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78 }
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79 return len;
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80 }
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81
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82 static void uudecode_b64_line(int ofd, const char *in, int ilen)
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83 {
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84 int olen;
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85 char out[4];
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86 while (ilen >= 4) {
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87 olen = uudecode_b64_4bytes(out,in);
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88 xwrite(ofd,out,olen);
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89 in += 4;
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90 ilen -= 4;
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91 };
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92 }
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93
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94 static void uudecode_b64(int ifd, int ofd)
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95 {
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96 int len;
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97 char *line;
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98 while ((line = get_line(ifd)) != NULL) {
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99 if (startswith(line,"====")) return;
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100 if ((len = strlen(line)) < 4) continue; // skip empty lines
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101 uudecode_b64_line(ofd,line,len);
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102 free(line);
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103 }
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104 }
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105
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106
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107 static void uudecode_uu_4bytes(char *out, const char *in, int len)
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108 {
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109 unsigned int i,x=0;
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110 for (i = 0; i < 4; i++) {
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111 x |= ((in[i] - 32) & 0x03f) << (6*(3-i));
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112 }
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113 if (len > 3) len = 3;
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114 for (i = 0; i < len; i++) {
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115 *out++ = x >> (8*(2-i));
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116 }
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117 }
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118
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119 static void uudecode_uu_line(int ofd, const char *in)
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120 {
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121 int olen = in[0] - 32;
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122 char buf[4];
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123 in++;
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124 while (olen > 0) {
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125 uudecode_uu_4bytes(buf,in,olen);
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126 xwrite(ofd,buf,olen < 3 ? olen : 3);
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127 olen -= 3;
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128 in += 4;
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129 }
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130 }
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131
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132 static void uudecode_uu(int ifd, int ofd)
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133 {
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134 char *line = NULL;
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135 while ((line = get_line(ifd)) != NULL) {
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136 if (line[0] == '`') break;
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137 if (startswith(line,"end")) break;
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138 if (strlen(line) < 1) break;
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139 uudecode_uu_line(ofd,line);
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140 free(line);
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141 }
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142 }
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143
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144 void uudecode_main(void)
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145 {
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146 char *out_filename = NULL;
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147 int ifd = 0; /* STDIN */
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148 int ofd = 1; /* STDOUT */
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149 char *line;
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150 char *p,*p2;
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151 void (*decoder)(int ifd, int ofd) = NULL;
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152 long mode = 0744;
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153 if (toys.optc == 1) {
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154 ifd = xopen(toys.optargs[0],O_RDONLY); // dies if error
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155 }
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156 do {
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157 if ((line = get_line(ifd)) == NULL) perror_exit("empty file");
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158 } while (strlen(line) == 0); /* skip over empty lines */
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159 if (startswith(line,"begin ")) decoder = uudecode_uu;
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160 else if (startswith(line,"begin-base64 ")) decoder = uudecode_b64;
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161 else perror_exit("not a valid uu- or base64-encoded file");
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162 for (p = line; !isspace(*p); p++) /* skip first part */;
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163 for (; isspace(*p); p++) /* skip spaces */;
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164 mode = strtoul(p,&p2,8);
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165 p = p2 + 1; /* skip space */
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166 if (toys.optflags & FLAG_o) {
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167 out_filename = TT.o;
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168 } else {
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169 out_filename = p;
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170 }
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171 ofd = xcreate(out_filename,O_WRONLY|O_CREAT|O_TRUNC,mode);
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172 free(line);
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173 decoder(ifd,ofd);
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174 }