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annotate toys/posix/uuencode.c @ 1605:c4c9267467f8 draft

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Add base64. The tizen guys wanted this. Yeah, I know there's base64 code in uuencode/uudecode, but that this has -i, input lines aren't of fixed length, encode/decode are in same file, there's no prefix/suffix code, it always writes to stdout... Eliminating the code duplication wouldn't be worth the if/else I'd have to add, so I just did a new one. Factored out the base64 table init into lib.c though: that was worth sharing.
author Rob Landley <rob@landley.net>
date Sat, 13 Dec 2014 11:58:08 -0600
parents 357b31ae2f04
children 1c152e2c5b27
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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831
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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 y
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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 stdin (or file) to stdout, with encode-filename in the output.
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16
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17 -m base64-encode
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18 */
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19
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20 #define FOR_uuencode
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21 #include "toys.h"
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22
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23 void uuencode_main(void)
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24 {
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25 char *p, *name = toys.optargs[toys.optc-1], buf[(76/4)*3];
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26
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27 int i, m = toys.optflags & FLAG_m, fd = 0;
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28
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29 if (toys.optc > 1) fd = xopen(toys.optargs[0], O_RDONLY);
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30
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31 base64_init(toybuf);
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32
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33 xprintf("begin%s 744 %s\n", m ? "-base64" : "", name);
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34 for (;;) {
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35 char *in;
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36
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37 if (!(i = xread(fd, buf, m ? sizeof(buf) : 45))) break;
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38
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39 if (!m) xputc(i+32);
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40 in = buf;
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41
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42 for (in = buf; in-buf < i; ) {
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43 int j, x, bytes = i - (in-buf);
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44
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45 if (bytes > 3) bytes = 3;
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46
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47 for (j = x = 0; j<4; j++) {
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48 int out;
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49
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50 if (j < bytes) x |= (*(in++) & 0x0ff) << (8*(2-j));
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51 out = (x>>((3-j)*6)) & 0x3f;
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52 xputc(m ? (j > bytes ? '=' : toybuf[out]) : (out ? out + 0x20 : 0x60));
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53 }
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54 }
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55 xputc('\n');
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56 }
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57 xputs(m ? "====" : "end");
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58 }