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/* uudecode.c - uudecode / base64 decode
*
* Copyright 2013 Erich Plondke <toybox@erich.wreck.org>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/uudecode.html
USE_UUDECODE(NEWTOY(uudecode, ">1o:", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_UMASK))
config UUDECODE
bool "uudecode"
default y
help
usage: uudecode [-o OUTFILE] [INFILE]
Decode file from stdin (or INFILE).
-o Write to OUTFILE instead of filename in header
*/
#define FOR_uudecode
#include "toys.h"
GLOBALS(
char *o;
)
void uudecode_main(void)
{
FILE *ifp = stdin;
int ofd, idx = 0, m = m, n;
size_t allocated_length;
char *line = 0, mode[16],
*class[] = {"begin%*[ ]%15s%*[ ]%n", "begin-base64%*[ ]%15s%*[ ]%n"};
if (toys.optc) ifp = xfopen(*toys.optargs, "r");
while (!idx) {
if ((n = getline(&line, &allocated_length, ifp)) == -1)
error_exit("no begin line");
if (!n) continue;
line[n-1] = 0;
for (m=0; m < 2; m++) {
sscanf(line, class[m], mode, &idx);
if (idx) break;
}
}
if (TT.o && !strcmp(TT.o, "-")) ofd = 1;
else ofd = xcreate(TT.o ? TT.o : line+idx, O_WRONLY|O_CREAT|O_TRUNC,
string_to_mode(mode, 0777^toys.old_umask));
for (;;) {
char *in, *out;
int olen;
if (m == 2 || (n = getline(&line, &allocated_length, ifp)) == -1) break;
if (n) line[n-1] = 0;
if (!strcmp(line, m ? "====" : "end")) {
m = 2;
continue;
}
olen = 0;
in = out = line;
if (!m) olen = (*(in++) - 32) & 0x3f;
for (;;) {
int i = 0, x = 0, len = 4;
char c = 0;
if (!m) {
if (olen < 1) break;
if (olen < 3) len = olen + 1;
}
while (i < len) {
if (!(c = *(in++))) goto line_done;
if (m) {
if (c == '=') {
len--;
continue;
} else if (len != 4) break;
if (c >= 'A' && c <= 'Z') c -= 'A';
else if (c >= 'a' && c <= 'z') c += 26 - 'a';
else if (c >= '0' && c <= '9') c += 52 - '0';
else if (c == '+') c = 62;
else if (c == '/') c = 63;
else continue;
} else c = (c - 32) & 0x3f;
x |= c << (6*(3-i));
if (i && i < len) {
*(out++) = (x>>(8*(3-i))) & 0xff;
olen--;
}
i++;
}
if (i && i!=len) error_exit("bad %s", line);
}
line_done:
xwrite(ofd, line, out-line);
}
if (CFG_TOYBOX_FREE) {
if (ifp != stdin) fclose(ifp);
close(ofd);
free(line);
}
}
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