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/* base64.c - Encode and decode base64
*
* Copyright 2014 Rob Landley <rob@landley.net>
*
* No standard
USE_BASE64(NEWTOY(base64, "diw#<1[!dw]", TOYFLAG_USR|TOYFLAG_BIN))
config BASE64
bool "base64"
default y
help
usage: base64 [-di] [-w COLUMNS] [FILE...]
Encode or decode in base64.
-d decode
-i ignore non-alphabetic characters
-w wrap output at COLUMNS (default 76)
*/
#define FOR_base64
#include "toys.h"
GLOBALS(
long columns;
)
static void do_base64(int fd, char *name)
{
int out = 0, bits = 0, x = 0, i, len;
char *buf = toybuf+128;
for (;;) {
if (!(len = xread(fd, buf, sizeof(toybuf)-128))) {
if (!(toys.optflags & FLAG_d)) {
if (bits) {
putchar(toybuf[out<<(6-bits)]);
x++;
}
while (x++&3) putchar('=');
if (x != 1) xputc('\n');
}
return;
}
for (i=0; i<len; i++) {
if (toys.optflags & FLAG_d) {
if (buf[i] == '=') return;
if ((x = stridx(toybuf, buf[i])) != -1) {
out = (out<<6) + x;
bits += 6;
if (bits >= 8) {
putchar(out >> (bits -= 8));
out &= (1<<bits)-1;
if (ferror(stdout)) perror_exit(0);
}
continue;
}
if (buf[i] == '\n' || (toys.optflags & FLAG_i)) continue;
break;
} else {
out = (out<<8) + buf[i];
bits += 8;
while (bits >= 6) {
putchar(toybuf[out >> (bits -= 6)]);
out &= (1<<bits)-1;
if (TT.columns == ++x) {
xputc('\n');
x = 0;
}
}
}
}
}
}
void base64_main(void)
{
if (!TT.columns) TT.columns = 76;
base64_init(toybuf);
loopfiles(toys.optargs, do_base64);
}
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