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1605
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1 /* base64.c - Encode and decode base64
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2 *
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3 * Copyright 2014 Rob Landley <rob@landley.net>
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4 *
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5 * No standard
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6
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7 USE_BASE64(NEWTOY(base64, "diw#<1[!dw]", TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config BASE64
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10 bool "base64"
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11 default y
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12 help
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13 usage: base64 [-di] [-w COLUMNS] [FILE...]
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14
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15 Encode or decode in base64.
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16
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17 -d decode
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18 -i ignore non-alphabetic characters
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19 -w wrap output at COLUMNS (default 76)
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20 */
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21
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22 #define FOR_base64
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23 #include "toys.h"
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24
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25 GLOBALS(
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26 long columns;
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27 )
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28
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29 static void do_base64(int fd, char *name)
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30 {
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31 int out = 0, bits = 0, x = 0, i, len;
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32 char *buf = toybuf+128;
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33
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34 for (;;) {
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35 if (!(len = xread(fd, buf, sizeof(toybuf)-128))) {
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36 if (!(toys.optflags & FLAG_d)) {
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37 if (bits) {
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38 putchar(toybuf[out<<(6-bits)]);
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39 x++;
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40 }
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41 while (x++&3) putchar('=');
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42 if (x != 1) xputc('\n');
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43 }
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44
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45 return;
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46 }
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47 for (i=0; i<len; i++) {
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48 if (toys.optflags & FLAG_d) {
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49 if (buf[i] == '=') return;
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50
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51 if ((x = stridx(toybuf, buf[i])) != -1) {
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52 out = (out<<6) + x;
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53 bits += 6;
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54 if (bits >= 8) {
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55 putchar(out >> (bits -= 8));
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56 out &= (1<<bits)-1;
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57 if (ferror(stdout)) perror_exit(0);
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58 }
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59
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60 continue;
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61 }
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62 if (buf[i] == '\n' || (toys.optflags & FLAG_i)) continue;
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63
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64 break;
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65 } else {
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66 out = (out<<8) + buf[i];
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67 bits += 8;
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68 while (bits >= 6) {
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69 putchar(toybuf[out >> (bits -= 6)]);
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70 out &= (1<<bits)-1;
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71 if (TT.columns == ++x) {
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72 xputc('\n');
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73 x = 0;
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74 }
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75 }
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76 }
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77 }
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78 }
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79 }
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80
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81 void base64_main(void)
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82 {
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83 if (!TT.columns) TT.columns = 76;
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84
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85 base64_init(toybuf);
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86 loopfiles(toys.optargs, do_base64);
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87 }
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