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/* uuencode.c - uuencode / base64 encode
*
* Copyright 2013 Erich Plondke <toybox@erich.wreck.org>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/uuencode.html
USE_UUENCODE(NEWTOY(uuencode, "<1>2m", TOYFLAG_USR|TOYFLAG_BIN))
config UUENCODE
bool "uuencode"
default y
help
usage: uuencode [-m] [file] encode-filename
Uuencode stdin (or file) to stdout, with encode-filename in the output.
-m Base64
*/
#define FOR_uuencode
#include "toys.h"
void uuencode_main(void)
{
char *name = toys.optargs[toys.optc-1], buf[(76/4)*3];
int i, m = FLAG(m), fd = 0;
if (toys.optc > 1) fd = xopenro(toys.optargs[0]);
base64_init(toybuf);
xprintf("begin%s 744 %s\n", m ? "-base64" : "", name);
for (;;) {
char *in;
if (!(i = xread(fd, buf, m ? sizeof(buf) : 45))) break;
if (!m) xputc(i+32);
in = buf;
for (in = buf; in-buf < i; ) {
int j, x, bytes = i - (in-buf);
if (bytes > 3) bytes = 3;
for (j = x = 0; j<4; j++) {
int out;
if (j < bytes) x |= (*(in++) & 0x0ff) << (8*(2-j));
out = (x>>((3-j)*6)) & 0x3f;
xputc(m ? (j > bytes ? '=' : toybuf[out]) : (out ? out + 0x20 : 0x60));
}
}
xputc('\n');
}
xputs(m ? "====" : "end");
}
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