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/* base64.c - Encode and decode base64
*
* Copyright 2014 Rob Landley <rob@landley.net>
*
* No standard
USE_BASE64(NEWTOY(base64, "diw#<0=76[!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 or 0 for no wrap)
*/
#define FOR_base64
#include "toys.h"
GLOBALS(
long w;
unsigned total;
)
static void wraputchar(int c, int *x)
{
putchar(c);
TT.total++;
if (TT.w && ++*x == TT.w) {
*x = 0;
xputc('\n');
};
}
static void do_base64(int fd, char *name)
{
int out = 0, bits = 0, x = 0, i, len;
char *buf = toybuf+128;
TT.total = 0;
for (;;) {
// If no more data, flush buffer
if (!(len = xread(fd, buf, sizeof(toybuf)-128))) {
if (!(toys.optflags & FLAG_d)) {
if (bits) wraputchar(toybuf[out<<(6-bits)], &x);
while (TT.total&3) wraputchar('=', &x);
if (x) 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) {
wraputchar(toybuf[out >> (bits -= 6)], &x);
out &= (1<<bits)-1;
}
}
}
}
}
void base64_main(void)
{
base64_init(toybuf);
loopfiles(toys.optargs, do_base64);
}
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