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annotate toys/pending/uuencode.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
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children 1fdaba9a7124
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823
0429050a224b uuencode and uudecode by Erich Plondke.
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1 /* uuencode.c - uuencode / base64 encode
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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/uuencode.html
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6
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7 USE_UUENCODE(NEWTOY(uuencode, "<1>2m", TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config UUENCODE
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10 bool "uuencode"
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11 default n
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12 help
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13 usage: uuencode [-m] [file] encode-filename
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14
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15 Uuencode or (with -m option) base64-encode stdin or [file],
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16 with encode-filename in the output, which is sent to stdout.
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17 */
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18
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19 #define FOR_uuencode
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20 #include "toys.h"
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21
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22
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23
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24 static void uuencode_b64_3bytes(char *out, const char *in, int bytes)
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25 {
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26 static const char *table = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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27 "abcdefghijklmnopqrstuvwxyz"
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28 "0123456789+/";
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29 unsigned int i,x=0;
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30 for (i = 0; i < bytes; i++) {
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31 x |= (in[i] & 0x0ff) << (8*(2-i));
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32 }
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33 out[0] = table[(x>>(3*6)) & 0x3f];
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34 out[1] = table[(x>>(2*6)) & 0x3f];
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35 out[2] = table[(x>>(1*6)) & 0x3f];
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36 out[3] = table[(x>>(0*6)) & 0x3f];
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37 if (bytes <= 1) out[2] = '=';
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38 if (bytes <= 2) out[3] = '=';
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39 }
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40
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41 static void uuencode_b64_line(char *out, const char *in, int len)
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42 {
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43 while (len > 0) {
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44 uuencode_b64_3bytes(out,in,len < 3 ? len : 3);
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45 xprintf("%c%c%c%c",out[0],out[1],out[2],out[3]);
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46 in += 3;
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47 len -= 3;
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48 };
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49 xprintf("\n");
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50 }
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51
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52 static void uuencode_b64(int fd, const char *name)
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53 {
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54 int len;
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55 char *inbuf = toybuf;
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56 char *outbuf = toybuf+64;
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57 xprintf("begin-base64 744 %s\n",name);
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58 do {
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59 len = xread(fd,inbuf,48);
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60 uuencode_b64_line(outbuf,inbuf,len);
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61 } while (len > 0);
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62 xprintf("====\n");
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63 }
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64
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65
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66 static void uuencode_uu_3bytes(char *out, const char *in)
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67 {
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68 unsigned int i,x=0;
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69 for (i = 0; i <= 2; i++) {
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70 x |= (in[i] & 0x0ff) << (8*(2-i));
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71 }
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72 for (i = 0; i <= 3; i++) {
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73 out[i] = 32 + ((x >> (6*(3-i))) & 0x3f);
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74 }
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75 }
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76
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77 static void uuencode_uu_line(char *out, const char *in, int len)
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78 {
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79 int i;
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80 if (len == 0) {
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81 xprintf("`\n");
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82 return;
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83 }
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84 xprintf("%c",len+32);
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85 for (i = 0; i < len; i += 3) {
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86 uuencode_uu_3bytes(out,in+i);
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87 xprintf("%c%c%c%c",out[0],out[1],out[2],out[3]);
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88 }
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89 xprintf("\n");
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90 }
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91
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92 static void uuencode_uu(int fd, const char *name)
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93 {
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94 int len;
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95 char *inbuf = toybuf;
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96 char *outbuf = toybuf+64;
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97 xprintf("begin 744 %s\n",name);
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98 do {
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99 len = xread(fd,inbuf,45);
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100 uuencode_uu_line(outbuf,inbuf,len);
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101 } while (len > 0);
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102 xprintf("end\n");
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103 }
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104
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105 void uuencode_main(void)
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106 {
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107 char *encode_filename = toys.optargs[0];
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108 int fd = 0; /* STDIN */
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109
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110 if (toys.optc == 2) {
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111 fd = xopen(toys.optargs[0],O_RDONLY); // dies if error
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112 encode_filename = toys.optargs[1];
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113 }
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114 if (toys.optflags & FLAG_m) uuencode_b64(fd,encode_filename);
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115 else uuencode_uu(fd,encode_filename);
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116 }