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annotate toys/pending/uudecode.c @ 839:a315fb343e2b

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More uudecode cleanup.
author Rob Landley <rob@landley.net>
date Thu, 28 Mar 2013 23:33:27 -0500
parents a60c572a8218
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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_UUDECODE(NEWTOY(uudecode, ">1o:", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_UMASK))
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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] [INFILE]
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14
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15 Decode file from stdin (or INFILE).
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16
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17 -o write to OUTFILE instead of filename in header
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18 */
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19
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20 #define FOR_uudecode
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21 #include "toys.h"
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22
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23 GLOBALS(
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24 char *o;
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25 )
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26
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27 static int uudecode_b64_4bytes(char *out, char *in)
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28 {
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29 int i, len = 3;
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30 unsigned x = 0;
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31
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32 for (i=0; i<4; i++) {
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33 int c = in[i];
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34
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35 if (c == '=') {
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36 len--;
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37 c = 'A';
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38 } else if (len != 3) len = 0;
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39 if (!len) goto bad;
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40
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41 if (c >= 'A' && c <= 'Z') c -= 'A';
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42 else if (c >= 'a' && c <= 'z') c += 26 - 'a';
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43 else if (c >= '0' && c <= '9') c += 52 - '0';
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44 else if (c == '+') c = 62;
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45 else if (c == '/') c =63;
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46 else goto bad;
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47
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48 x |= c << (6*(3-i));
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49 if (i && i <= len) *(out++) = (x>>(8*(3-i))) & 0xff;
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50 }
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51
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52 return len;
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53
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54 bad:
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55 error_exit("bad input");
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56 }
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57
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58 static void uudecode_b64_line(int ofd, char *in, int ilen)
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59 {
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60 int olen;
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61 char out[4];
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62
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63 while (ilen >= 4) {
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64 olen = uudecode_b64_4bytes(out, in);
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65 xwrite(ofd,out,olen);
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66 in += 4;
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67 ilen -= 4;
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68 };
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69 }
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70
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71 static void uudecode_uu_4bytes(char *out, char *in, int len)
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72 {
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73 unsigned int i,x=0;
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74
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75 for (i = 0; i < 4; i++) x |= ((in[i] - 32) & 0x03f) << (6*(3-i));
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76 if (len > 3) len = 3;
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77 for (i = 0; i < len; i++) *out++ = x >> (8*(2-i));
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78 }
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79
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80 static void uudecode_uu_line(int ofd, char *in)
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81 {
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82 int olen = (in[0] - 32) & 0x3f;
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83 char buf[4];
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84
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85 in++;
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86 while (olen > 0) {
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87 uudecode_uu_4bytes(buf,in,olen);
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88 xwrite(ofd,buf,olen < 3 ? olen : 3);
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89 olen -= 3;
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90 in += 4;
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91 }
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92 }
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93
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94 void uudecode_main(void)
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95 {
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96 int ifd = 0, ofd, idx = 0, m;
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97 char *line = 0,
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98 *class[] = {"begin%*[ ]%15s%*[ ]%n", "begin-base64%*[ ]%15s%*[ ]%n"};
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99
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100
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101 if (toys.optc) ifd = xopen(*toys.optargs, O_RDONLY);
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102
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103 for (;;) {
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104 char mode[16];
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105
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106 free(line);
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107 if (!(line = get_line(ifd))) error_exit("bad EOF");
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108 for (m=0; m < 2; m++) {
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109 sscanf(line, class[m], mode, &idx);
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110 if (idx) break;
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111 }
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112
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113 if (!idx) continue;
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114
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115 ofd = xcreate(TT.o ? TT.o : line+idx, O_WRONLY|O_CREAT|O_TRUNC,
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116 string_to_mode(mode, 0777^toys.old_umask));
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117 free(line);
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118 break;
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119 }
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120
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121 while ((line = get_line(ifd)) != NULL) {
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122 if (strcmp(line, m ? "====" : "end")) {
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123 if (m) uudecode_b64_line(ofd, line, strlen(line));
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124 else uudecode_uu_line(ofd, line);
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125 } else m = 2;
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126 free(line);
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127 if (m == 2) break;
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128 }
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129
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130 if (CFG_TOYBOX_FREE) {
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131 if (ifd) close(ifd);
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132 close(ofd);
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133 }
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134 }