Rewrite, 800+ bytes smaller and more robust.
This commit is contained in:
Glenn L McGrath
parent
5912acb670
commit
7f9de02ca6
@ -1,353 +1,201 @@
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/* uudecode.c -- uudecode utility.
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* Copyright (C) 1994, 1995 Free Software Foundation, Inc.
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/*
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* GPLv2
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* Copyright 2003, Glenn McGrath <bug1@optushome.com.au>
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*
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* This product is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation; either version 2 of the License.
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*
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* This product is distributed in the hope that it will be useful,
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this product; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Reworked to GNU style by Ian Lance Taylor, ian@airs.com, August 93.
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* Based on specification from
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* http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html
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*
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* Original copyright notice is retained at the end of this file.
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* Bugs: the spec doesnt mention anything about "`\n`\n" prior to the "end" line
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <getopt.h>
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#include <string.h>
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#include <stdlib.h>
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#include "busybox.h"
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#include "pwd_.h"
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#include "grp_.h"
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/*struct passwd *getpwnam();*/
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#include "libbb.h"
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/* Single character decode. */
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#define DEC(Char) (((Char) - ' ') & 077)
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static int read_stduu (const char *inname)
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static int read_stduu(FILE *src_stream, FILE *dst_stream)
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{
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char buf[2 * BUFSIZ];
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char *line;
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while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) {
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int length;
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char *line_ptr = line;
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if (strcmp(line, "end") == 0) {
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return(EXIT_SUCCESS);
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}
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length = ((*line_ptr - 0x20) & 0x3f)* 4 / 3;
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if (length <= 0) {
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/* Ignore the "`\n" line, why is it even in the encode file ? */
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continue;
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}
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if (length > 60) {
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bb_error_msg_and_die("Line too long");
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}
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line_ptr++;
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/* Tolerate an overly long line to acomadate a possible exta '`' */
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if (strlen(line_ptr) < length) {
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bb_error_msg_and_die("Short file");
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}
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while (length > 0) {
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/* Merge four 6 bit chars to three 8 bit chars */
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fputc(((line_ptr[0] - 0x20) & 077) << 2 | ((line_ptr[1] - 0x20) & 077) >> 4, dst_stream);
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line_ptr++;
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length--;
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if (length == 0) {
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break;
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}
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fputc(((line_ptr[0] - 0x20) & 077) << 4 | ((line_ptr[1] - 0x20) & 077) >> 2, dst_stream);
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line_ptr++;
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length--;
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if (length == 0) {
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break;
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}
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fputc(((line_ptr[0] - 0x20) & 077) << 6 | ((line_ptr[1] - 0x20) & 077), dst_stream);
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line_ptr += 2;
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length -= 2;
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}
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free(line);
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}
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bb_error_msg_and_die("Short file");
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}
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static int read_base64(FILE *src_stream, FILE *dst_stream)
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{
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const char *base64_table =
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n";
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char term_count = 0;
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while (1) {
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int n;
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char *p;
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char translated[4];
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int count = 0;
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if (fgets (buf, sizeof(buf), stdin) == NULL) {
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bb_error_msg("%s: Short file", inname);
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return FALSE;
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}
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p = buf;
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/* N is used to avoid writing out all the characters at the end of
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the file. */
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n = DEC (*p);
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if (n <= 0)
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break;
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for (++p; n > 0; p += 4, n -= 3) {
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while (count < 4) {
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char *table_ptr;
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char ch;
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if (n >= 3) {
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ch = DEC (p[0]) << 2 | DEC (p[1]) >> 4;
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putchar (ch);
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ch = DEC (p[1]) << 4 | DEC (p[2]) >> 2;
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putchar (ch);
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ch = DEC (p[2]) << 6 | DEC (p[3]);
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putchar (ch);
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} else {
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if (n >= 1) {
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ch = DEC (p[0]) << 2 | DEC (p[1]) >> 4;
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putchar (ch);
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}
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if (n >= 2) {
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ch = DEC (p[1]) << 4 | DEC (p[2]) >> 2;
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putchar (ch);
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}
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}
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}
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/* Get next _valid_ character */
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do {
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ch = fgetc(src_stream);
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if (ch == EOF) {
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bb_error_msg_and_die("Short file");
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}
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} while ((table_ptr = strchr(base64_table, ch)) == NULL);
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if (fgets (buf, sizeof(buf), stdin) == NULL
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|| strcmp (buf, "end\n")) {
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bb_error_msg("%s: No `end' line", inname);
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return FALSE;
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}
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/* Convert encoded charcter to decimal */
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ch = table_ptr - base64_table;
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return TRUE;
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}
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static int read_base64 (const char *inname)
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{
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static const char b64_tab[256] = {
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*000-007*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*010-017*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*020-027*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*030-037*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*040-047*/
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'\177', '\177', '\177', '\76', '\177', '\177', '\177', '\77', /*050-057*/
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'\64', '\65', '\66', '\67', '\70', '\71', '\72', '\73', /*060-067*/
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'\74', '\75', '\177', '\177', '\177', '\100', '\177', '\177', /*070-077*/
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'\177', '\0', '\1', '\2', '\3', '\4', '\5', '\6', /*100-107*/
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'\7', '\10', '\11', '\12', '\13', '\14', '\15', '\16', /*110-117*/
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'\17', '\20', '\21', '\22', '\23', '\24', '\25', '\26', /*120-127*/
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'\27', '\30', '\31', '\177', '\177', '\177', '\177', '\177', /*130-137*/
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'\177', '\32', '\33', '\34', '\35', '\36', '\37', '\40', /*140-147*/
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'\41', '\42', '\43', '\44', '\45', '\46', '\47', '\50', /*150-157*/
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'\51', '\52', '\53', '\54', '\55', '\56', '\57', '\60', /*160-167*/
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'\61', '\62', '\63', '\177', '\177', '\177', '\177', '\177', /*170-177*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*200-207*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*210-217*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*220-227*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*230-237*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*240-247*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*250-257*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*260-267*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*270-277*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*300-307*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*310-317*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*320-327*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*330-337*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*340-347*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*350-357*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*360-367*/
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'\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*370-377*/
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};
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unsigned char buf[2 * BUFSIZ];
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while (1) {
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int last_data = 0;
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unsigned char *p;
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if (fgets (buf, sizeof(buf), stdin) == NULL) {
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bb_error_msg("%s: Short file", inname);
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return FALSE;
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}
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p = buf;
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if (memcmp (buf, "====", 4) == 0)
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if (*table_ptr == '=') {
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if (term_count == 0) {
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translated[count] = 0;
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break;
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if (last_data != 0) {
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bb_error_msg("%s: data following `=' padding character", inname);
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return FALSE;
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}
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/* The following implementation of the base64 decoding might look
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a bit clumsy but I only try to follow the POSIX standard:
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``All line breaks or other characters not found in the table
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[with base64 characters] shall be ignored by decoding
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software.'' */
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while (*p != '\n') {
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char c1, c2, c3;
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while ((b64_tab[*p] & '\100') != 0)
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if (*p == '\n' || *p++ == '=')
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break;
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if (*p == '\n')
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/* This leaves the loop. */
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term_count++;
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}
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else if (*table_ptr == '\n') {
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/* Check for terminating line */
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if (term_count == 5) {
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return(EXIT_SUCCESS);
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}
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term_count = 1;
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continue;
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c1 = b64_tab[*p++];
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while ((b64_tab[*p] & '\100') != 0)
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if (*p == '\n' || *p++ == '=') {
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bb_error_msg("%s: illegal line", inname);
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return FALSE;
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}
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c2 = b64_tab[*p++];
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while (b64_tab[*p] == '\177')
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if (*p++ == '\n') {
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bb_error_msg("%s: illegal line", inname);
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return FALSE;
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}
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if (*p == '=') {
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putchar (c1 << 2 | c2 >> 4);
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last_data = 1;
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break;
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}
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c3 = b64_tab[*p++];
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while (b64_tab[*p] == '\177')
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if (*p++ == '\n') {
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bb_error_msg("%s: illegal line", inname);
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return FALSE;
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}
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putchar (c1 << 2 | c2 >> 4);
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putchar (c2 << 4 | c3 >> 2);
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if (*p == '=') {
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last_data = 1;
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break;
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}
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else
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putchar (c3 << 6 | b64_tab[*p++]);
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} else {
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translated[count] = ch;
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count++;
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term_count = 0;
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}
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}
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return TRUE;
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/* Merge 6 bit chars to 8 bit */
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fputc(translated[0] << 2 | translated[1] >> 4, dst_stream);
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if (count > 2) {
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fputc(translated[1] << 4 | translated[2] >> 2, dst_stream);
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}
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if (count > 3) {
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fputc(translated[2] << 6 | translated[3], dst_stream);
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}
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}
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}
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static int decode (const char *inname,
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const char *forced_outname)
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{
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struct passwd *pw;
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register char *p;
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int mode;
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char buf[2 * BUFSIZ];
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char *outname;
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int do_base64 = 0;
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int res;
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int dofre;
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/* Search for header line. */
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while (1) {
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if (fgets (buf, sizeof (buf), stdin) == NULL) {
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bb_error_msg("%s: No `begin' line", inname);
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return FALSE;
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}
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if (strncmp (buf, "begin", 5) == 0) {
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if (sscanf (buf, "begin-base64 %o %s", &mode, buf) == 2) {
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do_base64 = 1;
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break;
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} else if (sscanf (buf, "begin %o %s", &mode, buf) == 2)
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break;
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}
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}
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/* If the output file name is given on the command line this rules. */
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dofre = FALSE;
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if (forced_outname != NULL)
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outname = (char *) forced_outname;
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else {
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/* Handle ~user/file format. */
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if (buf[0] != '~')
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outname = buf;
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else {
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p = buf + 1;
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while (*p != '/')
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++p;
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if (*p == '\0') {
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bb_error_msg("%s: Illegal ~user", inname);
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return FALSE;
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}
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*p++ = '\0';
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pw = getpwnam (buf + 1);
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if (pw == NULL) {
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bb_error_msg("%s: No user `%s'", inname, buf + 1);
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return FALSE;
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}
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outname = concat_path_file(pw->pw_dir, p);
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dofre = TRUE;
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}
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}
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/* Create output file and set mode. */
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if (strcmp (outname, "/dev/stdout") != 0 && strcmp (outname, "-") != 0
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&& (freopen (outname, "w", stdout) == NULL
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|| chmod (outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO))
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)) {
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bb_perror_msg("%s", outname); /* */
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if (dofre)
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free(outname);
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return FALSE;
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}
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/* We differenciate decoding standard UU encoding and base64. A
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common function would only slow down the program. */
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/* For each input line: */
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if (do_base64)
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res = read_base64 (inname);
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else
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res = read_stduu (inname);
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if (dofre)
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free(outname);
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return res;
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}
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int uudecode_main (int argc,
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char **argv)
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extern int uudecode_main(int argc, char **argv)
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{
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int (*decode_fn_ptr) (FILE * src, FILE * dst);
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FILE *src_stream;
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char *outname = NULL;
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char *line;
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int opt;
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int exit_status;
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const char *outname;
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outname = NULL;
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while ((opt = getopt(argc, argv, "o:")) != EOF) {
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switch (opt) {
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case 0:
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break;
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opt = bb_getopt_ulflags(argc, argv, "o:", &outname);
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case 'o':
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outname = optarg;
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break;
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default:
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if (optind == argc) {
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src_stream = stdin;
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} else if (optind + 1 == argc) {
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src_stream = bb_xfopen(argv[optind], "r");
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} else {
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bb_show_usage();
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}
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/* Search for the start of the encoding */
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while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) {
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char *line_ptr = NULL;
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if (line == NULL) {
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break;
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} else if (strncmp(line, "begin-base64 ", 13) == 0) {
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line_ptr = line + 13;
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decode_fn_ptr = read_base64;
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} else if (strncmp(line, "begin ", 6) == 0) {
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line_ptr = line + 6;
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decode_fn_ptr = read_stduu;
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}
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if (optind == argc)
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exit_status = decode ("stdin", outname) == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
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else {
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exit_status = EXIT_SUCCESS;
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do {
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if (freopen (argv[optind], "r", stdin) != NULL) {
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if (decode (argv[optind], outname) != 0)
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exit_status = FALSE;
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if (line_ptr) {
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FILE *dst_stream;
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int mode;
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int ret;
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mode = strtoul(line_ptr, NULL, 8);
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if (outname == NULL) {
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outname = strchr(line_ptr, ' ');
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if ((outname == NULL) || (*outname == '\0')) {
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break;
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}
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outname++;
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}
|
||||
if (strcmp(outname, "-") == 0) {
|
||||
dst_stream = stdout;
|
||||
} else {
|
||||
bb_perror_msg("%s", argv[optind]);
|
||||
exit_status = EXIT_FAILURE;
|
||||
dst_stream = bb_xfopen(outname, "w");
|
||||
chmod(outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO));
|
||||
}
|
||||
optind++;
|
||||
free(line);
|
||||
ret = decode_fn_ptr(src_stream, dst_stream);
|
||||
bb_fclose_nonstdin(src_stream);
|
||||
return(ret);
|
||||
}
|
||||
while (optind < argc);
|
||||
free(line);
|
||||
}
|
||||
return(exit_status);
|
||||
bb_error_msg_and_die("No `begin' line");
|
||||
}
|
||||
|
||||
/* Copyright (c) 1983 Regents of the University of California.
|
||||
* All rights reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
*
|
||||
* 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
|
||||
* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
|
||||
*
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user