diff options
Diffstat (limited to 'coreutils/uudecode.c')
| -rw-r--r-- | coreutils/uudecode.c | 508 |
1 files changed, 178 insertions, 330 deletions
diff --git a/coreutils/uudecode.c b/coreutils/uudecode.c index 4f9270c..1734ed4 100644 --- a/coreutils/uudecode.c +++ b/coreutils/uudecode.c @@ -1,353 +1,201 @@ -/* uudecode.c -- uudecode utility. - * Copyright (C) 1994, 1995 Free Software Foundation, Inc. +/* + * GPLv2 + * Copyright 2003, Glenn McGrath <bug1@optushome.com.au> * - * This product is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2, or (at your option) - * any later version. + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as published + * by the Free Software Foundation; either version 2 of the License. * - * This product is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Library General Public License for more details. * - * You should have received a copy of the GNU General Public License - * along with this product; see the file COPYING. If not, write to - * the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA - * 02111-1307, USA. + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * - * Reworked to GNU style by Ian Lance Taylor, ian@airs.com, August 93. + * Based on specification from + * http://www.opengroup.org/onlinepubs/007904975/utilities/uuencode.html * - * Original copyright notice is retained at the end of this file. + * Bugs: the spec doesnt mention anything about "`\n`\n" prior to the "end" line */ - #include <stdio.h> #include <errno.h> #include <getopt.h> #include <string.h> #include <stdlib.h> -#include "busybox.h" -#include "pwd_.h" -#include "grp_.h" - -/*struct passwd *getpwnam();*/ -/* Single character decode. */ -#define DEC(Char) (((Char) - ' ') & 077) +#include "libbb.h" -static int read_stduu (const char *inname) +static int read_stduu(FILE *src_stream, FILE *dst_stream) { - char buf[2 * BUFSIZ]; - - while (1) { - int n; - char *p; - - if (fgets (buf, sizeof(buf), stdin) == NULL) { - bb_error_msg("%s: Short file", inname); - return FALSE; - } - p = buf; - - /* N is used to avoid writing out all the characters at the end of - the file. */ - n = DEC (*p); - if (n <= 0) - break; - for (++p; n > 0; p += 4, n -= 3) { - char ch; - - if (n >= 3) { - ch = DEC (p[0]) << 2 | DEC (p[1]) >> 4; - putchar (ch); - ch = DEC (p[1]) << 4 | DEC (p[2]) >> 2; - putchar (ch); - ch = DEC (p[2]) << 6 | DEC (p[3]); - putchar (ch); - } else { - if (n >= 1) { - ch = DEC (p[0]) << 2 | DEC (p[1]) >> 4; - putchar (ch); - } - if (n >= 2) { - ch = DEC (p[1]) << 4 | DEC (p[2]) >> 2; - putchar (ch); - } - } - } - } - - if (fgets (buf, sizeof(buf), stdin) == NULL - || strcmp (buf, "end\n")) { - bb_error_msg("%s: No `end' line", inname); - return FALSE; - } - - return TRUE; + char *line; + + while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) { + int length; + char *line_ptr = line; + + if (strcmp(line, "end") == 0) { + return(EXIT_SUCCESS); + } + length = ((*line_ptr - 0x20) & 0x3f)* 4 / 3; + + if (length <= 0) { + /* Ignore the "`\n" line, why is it even in the encode file ? */ + continue; + } + if (length > 60) { + bb_error_msg_and_die("Line too long"); + } + + line_ptr++; + /* Tolerate an overly long line to acomadate a possible exta '`' */ + if (strlen(line_ptr) < length) { + bb_error_msg_and_die("Short file"); + } + + while (length > 0) { + /* Merge four 6 bit chars to three 8 bit chars */ + fputc(((line_ptr[0] - 0x20) & 077) << 2 | ((line_ptr[1] - 0x20) & 077) >> 4, dst_stream); + line_ptr++; + length--; + if (length == 0) { + break; + } + + fputc(((line_ptr[0] - 0x20) & 077) << 4 | ((line_ptr[1] - 0x20) & 077) >> 2, dst_stream); + line_ptr++; + length--; + if (length == 0) { + break; + } + + fputc(((line_ptr[0] - 0x20) & 077) << 6 | ((line_ptr[1] - 0x20) & 077), dst_stream); + line_ptr += 2; + length -= 2; + } + free(line); + } + bb_error_msg_and_die("Short file"); } -static int read_base64 (const char *inname) +static int read_base64(FILE *src_stream, FILE *dst_stream) { - static const char b64_tab[256] = { - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*000-007*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*010-017*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*020-027*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*030-037*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*040-047*/ - '\177', '\177', '\177', '\76', '\177', '\177', '\177', '\77', /*050-057*/ - '\64', '\65', '\66', '\67', '\70', '\71', '\72', '\73', /*060-067*/ - '\74', '\75', '\177', '\177', '\177', '\100', '\177', '\177', /*070-077*/ - '\177', '\0', '\1', '\2', '\3', '\4', '\5', '\6', /*100-107*/ - '\7', '\10', '\11', '\12', '\13', '\14', '\15', '\16', /*110-117*/ - '\17', '\20', '\21', '\22', '\23', '\24', '\25', '\26', /*120-127*/ - '\27', '\30', '\31', '\177', '\177', '\177', '\177', '\177', /*130-137*/ - '\177', '\32', '\33', '\34', '\35', '\36', '\37', '\40', /*140-147*/ - '\41', '\42', '\43', '\44', '\45', '\46', '\47', '\50', /*150-157*/ - '\51', '\52', '\53', '\54', '\55', '\56', '\57', '\60', /*160-167*/ - '\61', '\62', '\63', '\177', '\177', '\177', '\177', '\177', /*170-177*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*200-207*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*210-217*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*220-227*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*230-237*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*240-247*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*250-257*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*260-267*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*270-277*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*300-307*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*310-317*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*320-327*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*330-337*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*340-347*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*350-357*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*360-367*/ - '\177', '\177', '\177', '\177', '\177', '\177', '\177', '\177', /*370-377*/ - }; - unsigned char buf[2 * BUFSIZ]; - - while (1) { - int last_data = 0; - unsigned char *p; - - if (fgets (buf, sizeof(buf), stdin) == NULL) { - bb_error_msg("%s: Short file", inname); - return FALSE; - } - p = buf; - - if (memcmp (buf, "====", 4) == 0) - break; - if (last_data != 0) { - bb_error_msg("%s: data following `=' padding character", inname); - return FALSE; - } - - /* The following implementation of the base64 decoding might look - a bit clumsy but I only try to follow the POSIX standard: - ``All line breaks or other characters not found in the table - [with base64 characters] shall be ignored by decoding - software.'' */ - while (*p != '\n') { - char c1, c2, c3; - - while ((b64_tab[*p] & '\100') != 0) - if (*p == '\n' || *p++ == '=') - break; - if (*p == '\n') - /* This leaves the loop. */ - continue; - c1 = b64_tab[*p++]; - - while ((b64_tab[*p] & '\100') != 0) - if (*p == '\n' || *p++ == '=') { - bb_error_msg("%s: illegal line", inname); - return FALSE; - } - c2 = b64_tab[*p++]; - - while (b64_tab[*p] == '\177') - if (*p++ == '\n') { - bb_error_msg("%s: illegal line", inname); - return FALSE; - } - if (*p == '=') { - putchar (c1 << 2 | c2 >> 4); - last_data = 1; - break; - } - c3 = b64_tab[*p++]; - - while (b64_tab[*p] == '\177') - if (*p++ == '\n') { - bb_error_msg("%s: illegal line", inname); - return FALSE; - } - putchar (c1 << 2 | c2 >> 4); - putchar (c2 << 4 | c3 >> 2); - if (*p == '=') { - last_data = 1; - break; - } - else - putchar (c3 << 6 | b64_tab[*p++]); - } - } - - return TRUE; + const char *base64_table = + "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n"; + char term_count = 0; + + while (1) { + char translated[4]; + int count = 0; + + while (count < 4) { + char *table_ptr; + char ch; + + /* Get next _valid_ character */ + do { + ch = fgetc(src_stream); + if (ch == EOF) { + bb_error_msg_and_die("Short file"); + } + } while ((table_ptr = strchr(base64_table, ch)) == NULL); + + /* Convert encoded charcter to decimal */ + ch = table_ptr - base64_table; + + if (*table_ptr == '=') { + if (term_count == 0) { + translated[count] = 0; + break; + } + term_count++; + } + else if (*table_ptr == '\n') { + /* Check for terminating line */ + if (term_count == 5) { + return(EXIT_SUCCESS); + } + term_count = 1; + continue; + } else { + translated[count] = ch; + count++; + term_count = 0; + } + } + + /* Merge 6 bit chars to 8 bit */ + fputc(translated[0] << 2 | translated[1] >> 4, dst_stream); + if (count > 2) { + fputc(translated[1] << 4 | translated[2] >> 2, dst_stream); + } + if (count > 3) { + fputc(translated[2] << 6 | translated[3], dst_stream); + } + } } -static int decode (const char *inname, - const char *forced_outname) +extern int uudecode_main(int argc, char **argv) { - struct passwd *pw; - register char *p; - int mode; - char buf[2 * BUFSIZ]; - char *outname; - int do_base64 = 0; - int res; - int dofre; - - /* Search for header line. */ - - while (1) { - if (fgets (buf, sizeof (buf), stdin) == NULL) { - bb_error_msg("%s: No `begin' line", inname); - return FALSE; - } - - if (strncmp (buf, "begin", 5) == 0) { - if (sscanf (buf, "begin-base64 %o %s", &mode, buf) == 2) { - do_base64 = 1; - break; - } else if (sscanf (buf, "begin %o %s", &mode, buf) == 2) - break; - } - } - - /* If the output file name is given on the command line this rules. */ - dofre = FALSE; - if (forced_outname != NULL) - outname = (char *) forced_outname; - else { - /* Handle ~user/file format. */ - if (buf[0] != '~') - outname = buf; - else { - p = buf + 1; - while (*p != '/') - ++p; - if (*p == '\0') { - bb_error_msg("%s: Illegal ~user", inname); - return FALSE; - } - *p++ = '\0'; - pw = getpwnam (buf + 1); - if (pw == NULL) { - bb_error_msg("%s: No user `%s'", inname, buf + 1); - return FALSE; - } - outname = concat_path_file(pw->pw_dir, p); - dofre = TRUE; - } - } - - /* Create output file and set mode. */ - if (strcmp (outname, "/dev/stdout") != 0 && strcmp (outname, "-") != 0 - && (freopen (outname, "w", stdout) == NULL - || chmod (outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO)) - )) { - bb_perror_msg("%s", outname); /* */ - if (dofre) - free(outname); - return FALSE; - } - - /* We differenciate decoding standard UU encoding and base64. A - common function would only slow down the program. */ - - /* For each input line: */ - if (do_base64) - res = read_base64 (inname); - else - res = read_stduu (inname); - if (dofre) - free(outname); - return res; + int (*decode_fn_ptr) (FILE * src, FILE * dst); + FILE *src_stream; + char *outname = NULL; + char *line; + int opt; + + opt = bb_getopt_ulflags(argc, argv, "o:", &outname); + + if (optind == argc) { + src_stream = stdin; + } else if (optind + 1 == argc) { + src_stream = bb_xfopen(argv[optind], "r"); + } else { + bb_show_usage(); + } + + /* Search for the start of the encoding */ + while ((line = bb_get_chomped_line_from_file(src_stream)) != NULL) { + char *line_ptr = NULL; + + if (line == NULL) { + break; + } else if (strncmp(line, "begin-base64 ", 13) == 0) { + line_ptr = line + 13; + decode_fn_ptr = read_base64; + } else if (strncmp(line, "begin ", 6) == 0) { + line_ptr = line + 6; + decode_fn_ptr = read_stduu; + } + + if (line_ptr) { + FILE *dst_stream; + int mode; + int ret; + + mode = strtoul(line_ptr, NULL, 8); + if (outname == NULL) { + outname = strchr(line_ptr, ' '); + if ((outname == NULL) || (*outname == '\0')) { + break; + } + outname++; + } + if (strcmp(outname, "-") == 0) { + dst_stream = stdout; + } else { + dst_stream = bb_xfopen(outname, "w"); + chmod(outname, mode & (S_IRWXU | S_IRWXG | S_IRWXO)); + } + free(line); + ret = decode_fn_ptr(src_stream, dst_stream); + bb_fclose_nonstdin(src_stream); + return(ret); + } + free(line); + } + bb_error_msg_and_die("No `begin' line"); } - -int uudecode_main (int argc, - char **argv) -{ - int opt; - int exit_status; - const char *outname; - outname = NULL; - - while ((opt = getopt(argc, argv, "o:")) != EOF) { - switch (opt) { - case 0: - break; - - case 'o': - outname = optarg; - break; - - default: - bb_show_usage(); - } - } - - if (optind == argc) - exit_status = decode ("stdin", outname) == 0 ? EXIT_SUCCESS : EXIT_FAILURE; - else { - exit_status = EXIT_SUCCESS; - do { - if (freopen (argv[optind], "r", stdin) != NULL) { - if (decode (argv[optind], outname) != 0) - exit_status = FALSE; - } else { - bb_perror_msg("%s", argv[optind]); - exit_status = EXIT_FAILURE; - } - optind++; - } - while (optind < argc); - } - return(exit_status); -} - -/* 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. - */ - - |