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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;
)
/*
* Turn a character back into a value.
* The smallest valid character is 0x2B ('+')
* The biggest valid character is 0x7A ('z')
* We can make a table of 16*5 entries to cover 0x2B - 0x7A
*/
static inline signed char uudecode_b64_1byte(char in)
{
char ret;
static const signed char table[16*5] = {
/* '+' (0x2B) is 62, '/'(0x2F) is 63, rest invalid */
62, -1, -1, -1, 63,
/* '0'-'9' are values 52-61, rest of 0x3A - 0x3F is invalid, = is special... */
52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,
/* '@' is invalid, 'A'-'Z' are values 0-25, 0x5b - 0x5F are invalid */
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,
/* '`' is invalid, 'a'-'z' are values 26-51, 0x7B - 0x7F are invalid */
-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,
41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51
};
in &= 0x7f;
if (in < '+') return -1;
if (in > 'z') return -1;
in -= '+';
ret = table[in];
return ret;
};
/* Returns length put in out */
static int uudecode_b64_4bytes(char *out, const char *in)
{
unsigned int i, x=0;
signed char b0, b1, b2, b3;
int len = 3;
b0 = uudecode_b64_1byte(in[0]);
b1 = uudecode_b64_1byte(in[1]);
b2 = uudecode_b64_1byte(in[2]);
b3 = uudecode_b64_1byte(in[3]);
if ((b1 < 0) || (b0 < 0)) return 0;
if (b3 < 0) len--;
if (b2 < 0) len--;
x = ((b0 & 0x3f)<<18) | ((b1 & 0x3f)<<12) | ((b2 & 0x3f) << 6) | (b3 & 0x3f);
for (i = 0; i < len; i++) *out++ = (x>>(8*(2-i))) & 0x0ff;
return len;
}
static void uudecode_b64_line(int ofd, const 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_b64(int ifd, int ofd)
{
int len;
char *line;
while ((line = get_line(ifd)) != NULL) {
if ((len = strlen(line)) < 4) continue;
if (!strncmp(line, "====", 4)) return;
uudecode_b64_line(ofd,line,len);
free(line);
}
}
static void uudecode_uu_4bytes(char *out, const 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, const char *in)
{
int olen = in[0] - 32;
char buf[4];
in++;
while (olen > 0) {
uudecode_uu_4bytes(buf,in,olen);
xwrite(ofd,buf,olen < 3 ? olen : 3);
olen -= 3;
in += 4;
}
}
static void uudecode_uu(int ifd, int ofd)
{
char *line = NULL;
while ((line = get_line(ifd)) != NULL) {
if (line[0] == '`') break;
if (!strncmp(line, "end", 3)) break;
if (strlen(line) < 1) break;
uudecode_uu_line(ofd,line);
free(line);
}
}
void uudecode_main(void)
{
int ifd = 0, ofd, idx = 0;
char *line;
void (*decoder)(int ifd, int ofd) = NULL;
if (toys.optc) ifd = xopen(*toys.optargs, O_RDONLY);
for (;;) {
char mode[16];
if (!(line = get_line(ifd))) error_exit("no header");
sscanf(line, "begin%*[ ]%15s%*[ ]%n", mode, &idx);
if (idx) decoder = uudecode_uu;
else {
sscanf(line, "begin-base64%*[ ]%15s%*[ ]%n", mode, &idx);
if (idx) decoder = uudecode_b64;
}
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);
decoder(ifd,ofd);
break;
}
if (CFG_TOYBOX_FREE) {
if (ifd) close(ifd);
close(ofd);
}
}
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