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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 n
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;
)
static int uudecode_b64_4bytes(char *out, char *in)
{
int i, len = 3;
unsigned x = 0;
for (i=0; i<4; i++) {
int c = in[i];
if (c == '=') {
len--;
c = 'A';
} else if (len != 3) len = 0;
if (!len) goto bad;
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 goto bad;
x |= c << (6*(3-i));
if (i && i <= len) *(out++) = (x>>(8*(3-i))) & 0xff;
}
return len;
bad:
error_exit("bad input");
}
static void uudecode_b64_line(int ofd, char *in, int ilen)
{
int olen;
char out[4];
while (ilen >= 4) {
olen = uudecode_b64_4bytes(out, in);
xwrite(ofd,out,olen);
in += 4;
ilen -= 4;
};
}
static void uudecode_uu_4bytes(char *out, char *in, int len)
{
unsigned int i,x=0;
for (i = 0; i < 4; i++) x |= ((in[i] - 32) & 0x03f) << (6*(3-i));
if (len > 3) len = 3;
for (i = 0; i < len; i++) *out++ = x >> (8*(2-i));
}
static void uudecode_uu_line(int ofd, char *in)
{
int olen = (in[0] - 32) & 0x3f;
char buf[4];
in++;
while (olen > 0) {
uudecode_uu_4bytes(buf,in,olen);
xwrite(ofd,buf,olen < 3 ? olen : 3);
olen -= 3;
in += 4;
}
}
void uudecode_main(void)
{
int ifd = 0, ofd, idx = 0, m;
char *line = 0,
*class[] = {"begin%*[ ]%15s%*[ ]%n", "begin-base64%*[ ]%15s%*[ ]%n"};
if (toys.optc) ifd = xopen(*toys.optargs, O_RDONLY);
for (;;) {
char mode[16];
free(line);
if (!(line = get_line(ifd))) error_exit("bad EOF");
for (m=0; m < 2; m++) {
sscanf(line, class[m], mode, &idx);
if (idx) break;
}
if (!idx) continue;
ofd = xcreate(TT.o ? TT.o : line+idx, O_WRONLY|O_CREAT|O_TRUNC,
string_to_mode(mode, 0777^toys.old_umask));
free(line);
break;
}
while ((line = get_line(ifd)) != NULL) {
if (strcmp(line, m ? "====" : "end")) {
if (m) uudecode_b64_line(ofd, line, strlen(line));
else uudecode_uu_line(ofd, line);
} else m = 2;
free(line);
if (m == 2) break;
}
if (CFG_TOYBOX_FREE) {
if (ifd) close(ifd);
close(ofd);
}
}
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