Rewrite, 800+ bytes smaller and more robust.

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.
- */
-
-