LXR toybox/toys/posix/uuencode.c

   1/* uuencode.c - uuencode / base64 encode
   2 *
   3 * Copyright 2013 Erich Plondke <toybox@erich.wreck.org>
   4 *
   5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/uuencode.html
   6
   7USE_UUENCODE(NEWTOY(uuencode, "<1>2m", TOYFLAG_USR|TOYFLAG_BIN))
   8
   9config UUENCODE
  10  bool "uuencode"
  11  default y 
  12  help
  13    usage: uuencode [-m] [file] encode-filename
  14
  15    Uuencode stdin (or file) to stdout, with encode-filename in the output.
  16
  17    -m  Base64
  18*/
  19
  20#define FOR_uuencode
  21#include "toys.h"
  22
  23void uuencode_main(void)
  24{
  25  char *name = toys.optargs[toys.optc-1], buf[(76/4)*3];
  26
  27  int i, m = FLAG(m), fd = 0;
  28
  29  if (toys.optc > 1) fd = xopenro(toys.optargs[0]);
  30
  31  base64_init(toybuf);
  32
  33  xprintf("begin%s 744 %s\n", m ? "-base64" : "", name);
  34  for (;;) {
  35    char *in;
  36
  37    if (!(i = xread(fd, buf, m ? sizeof(buf) : 45))) break;
  38
  39    if (!m) xputc(i+32);
  40    in = buf;
  41
  42    for (in = buf; in-buf < i; ) {
  43      int j, x, bytes = i - (in-buf);
  44
  45      if (bytes > 3) bytes = 3;
  46
  47      for (j = x = 0; j<4; j++) {
  48        int out;
  49
  50        if (j < bytes) x |= (*(in++) & 0x0ff) << (8*(2-j));
  51        out = (x>>((3-j)*6)) & 0x3f;
  52        xputc(m ? (j > bytes ? '=' : toybuf[out]) : (out ? out + 0x20 : 0x60));
  53      } 
  54    }
  55    xputc('\n');
  56  }
  57  xputs(m ? "====" : "end");
  58}
  59