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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 n
help
usage: uuencode [-m] [file] encode-filename
Uuencode or (with -m option) base64-encode stdin or [file],
with encode-filename in the output, which is sent to stdout.
*/
#define FOR_uuencode
#include "toys.h"
static void uuencode_b64_3bytes(char *out, const char *in, int bytes)
{
static const char *table = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789+/";
unsigned int i,x=0;
for (i = 0; i < bytes; i++) {
x |= (in[i] & 0x0ff) << (8*(2-i));
}
out[0] = table[(x>>(3*6)) & 0x3f];
out[1] = table[(x>>(2*6)) & 0x3f];
out[2] = table[(x>>(1*6)) & 0x3f];
out[3] = table[(x>>(0*6)) & 0x3f];
if (bytes <= 1) out[2] = '=';
if (bytes <= 2) out[3] = '=';
}
static void uuencode_b64_line(char *out, const char *in, int len)
{
while (len > 0) {
uuencode_b64_3bytes(out,in,len < 3 ? len : 3);
xprintf("%c%c%c%c",out[0],out[1],out[2],out[3]);
in += 3;
len -= 3;
};
xprintf("\n");
}
static void uuencode_b64(int fd, const char *name)
{
int len;
char *inbuf = toybuf;
char *outbuf = toybuf+64;
xprintf("begin-base64 744 %s\n",name);
do {
len = xread(fd,inbuf,48);
if (len > 0) uuencode_b64_line(outbuf,inbuf,len);
} while (len > 0);
xprintf("====\n");
}
static void uuencode_uu_3bytes(char *out, const char *in)
{
unsigned int i,x=0;
for (i = 0; i <= 2; i++) {
x |= (in[i] & 0x0ff) << (8*(2-i));
}
for (i = 0; i <= 3; i++) {
out[i] = 32 + ((x >> (6*(3-i))) & 0x3f);
}
}
static void uuencode_uu_line(char *out, const char *in, int len)
{
int i;
if (len == 0) {
xprintf("`\n");
return;
}
xprintf("%c",len+32);
for (i = 0; i < len; i += 3) {
uuencode_uu_3bytes(out,in+i);
xprintf("%c%c%c%c",out[0],out[1],out[2],out[3]);
}
xprintf("\n");
}
static void uuencode_uu(int fd, const char *name)
{
int len;
char *inbuf = toybuf;
char *outbuf = toybuf+64;
xprintf("begin 744 %s\n",name);
do {
len = xread(fd,inbuf,45);
uuencode_uu_line(outbuf,inbuf,len);
} while (len > 0);
xprintf("end\n");
}
void uuencode_main(void)
{
char *encode_filename = toys.optargs[0];
int fd = 0; /* STDIN */
if (toys.optc == 2) {
fd = xopen(toys.optargs[0],O_RDONLY); // dies if error
encode_filename = toys.optargs[1];
}
if (toys.optflags & FLAG_m) uuencode_b64(fd,encode_filename);
else uuencode_uu(fd,encode_filename);
}
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