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