lib-src/hexl.c

   1 /* Convert files for Emacs Hexl mode.
   2    Copyright (C) 1989, 2001-2015 Free Software Foundation, Inc.
   3
   4 Author: Keith Gabryelski
   5 (according to authors.el)
   6
   7 This file is not considered part of GNU Emacs.
   8
   9 This program is free software: you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation, either version 3 of the License, or
  12 (at your option) any later version.
  13
  14 This program is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22
  23 #include <config.h>
  24
  25 #include <stdio.h>
  26 #include <ctype.h>
  27
  28 #include <binary-io.h>
  29
  30 #define DEFAULT_GROUPING        0x01
  31 #define DEFAULT_BASE            16
  32
  33 int base = DEFAULT_BASE;
  34 bool un_flag = false, iso_flag = false, endian = true;
  35 int group_by = DEFAULT_GROUPING;
  36 char *progname;
  37
  38 _Noreturn void usage (void);
  39
  40 int
  41 main (int argc, char **argv)
  42 {
  43   register long address;
  44   char string[18];
  45   FILE *fp;
  46
  47   progname = *argv++; --argc;
  48
  49   /*
  50    ** -hex              hex dump
  51    ** -oct              Octal dump
  52    ** -group-by-8-bits
  53    ** -group-by-16-bits
  54    ** -group-by-32-bits
  55    ** -group-by-64-bits
  56    ** -iso              iso character set.
  57    ** -big-endian       Big Endian
  58    ** -little-endian    Little Endian
  59    ** -un || -de        from hexl format to binary.
  60    ** --                End switch list.
  61    ** <filename>        dump filename
  62    ** -         (as filename == stdin)
  63    */
  64
  65   while (*argv && *argv[0] == '-' && (*argv)[1])
  66     {
  67       /* A switch! */
  68       if (!strcmp (*argv, "--"))
  69         {
  70           --argc; argv++;
  71           break;
  72         }
  73       else if (!strcmp (*argv, "-un") || !strcmp (*argv, "-de"))
  74         {
  75           un_flag = true;
  76           --argc; argv++;
  77         }
  78       else if (!strcmp (*argv, "-hex"))
  79         {
  80           base = 16;
  81           --argc; argv++;
  82         }
  83       else if (!strcmp (*argv, "-iso"))
  84         {
  85           iso_flag = true;
  86           --argc; argv++;
  87         }
  88       else if (!strcmp (*argv, "-oct"))
  89         {
  90           base = 8;
  91           --argc; argv++;
  92         }
  93       else if (!strcmp (*argv, "-big-endian"))
  94         {
  95           endian = true;
  96           --argc; argv++;
  97         }
  98       else if (!strcmp (*argv, "-little-endian"))
  99         {
 100           endian = false;
 101           --argc; argv++;
 102         }
 103       else if (!strcmp (*argv, "-group-by-8-bits"))
 104         {
 105           group_by = 0x00;
 106           --argc; argv++;
 107         }
 108       else if (!strcmp (*argv, "-group-by-16-bits"))
 109         {
 110           group_by = 0x01;
 111           --argc; argv++;
 112         }
 113       else if (!strcmp (*argv, "-group-by-32-bits"))
 114         {
 115           group_by = 0x03;
 116           --argc; argv++;
 117         }
 118       else if (!strcmp (*argv, "-group-by-64-bits"))
 119         {
 120           group_by = 0x07;
 121           endian = false;
 122           --argc; argv++;
 123         }
 124       else
 125         {
 126           fprintf (stderr, "%s: invalid switch: \"%s\".\n", progname,
 127                    *argv);
 128           usage ();
 129         }
 130     }
 131
 132   do
 133     {
 134       if (*argv == NULL)
 135         fp = stdin;
 136       else
 137         {
 138           char *filename = *argv++;
 139
 140           if (!strcmp (filename, "-"))
 141             fp = stdin;
 142           else if ((fp = fopen (filename, "r")) == NULL)
 143             {
 144               perror (filename);
 145               continue;
 146             }
 147         }
 148
 149       if (un_flag)
 150         {
 151           SET_BINARY (fileno (stdout));
 152
 153           for (;;)
 154             {
 155               int i, c = 0, d;
 156               char buf[18];
 157
 158 #define hexchar(x) (isdigit (x) ? x - '0' : x - 'a' + 10)
 159
 160               /* Skip 10 bytes.  */
 161               if (fread (buf, 1, 10, fp) != 10)
 162                 break;
 163
 164               for (i=0; i < 16; ++i)
 165                 {
 166                   if ((c = getc (fp)) == ' ' || c == EOF)
 167                     break;
 168
 169                   d = getc (fp);
 170                   c = hexchar (c) * 0x10 + hexchar (d);
 171                   putchar (c);
 172
 173                   if ((i&group_by) == group_by)
 174                     getc (fp);
 175                 }
 176
 177               if (c == ' ')
 178                 {
 179                   while ((c = getc (fp)) != '\n' && c != EOF)
 180                     ;
 181
 182                   if (c == EOF)
 183                     break;
 184                 }
 185               else
 186                 {
 187                   if (i < 16)
 188                     break;
 189
 190                   /* Skip 18 bytes.  */
 191                   if (fread (buf, 1, 18, fp) != 18)
 192                     break;
 193                 }
 194             }
 195         }
 196       else
 197         {
 198           SET_BINARY (fileno (fp));
 199           address = 0;
 200           string[0] = ' ';
 201           string[17] = '\0';
 202           for (;;)
 203             {
 204               register int i, c = 0;
 205
 206               for (i=0; i < 16; ++i)
 207                 {
 208                   if ((c = getc (fp)) == EOF)
 209                     {
 210                       if (!i)
 211                         break;
 212
 213                       fputs ("  ", stdout);
 214                       string[i+1] = '\0';
 215                     }
 216                   else
 217                     {
 218                       if (!i)
 219                         printf ("%08lx: ", address);
 220
 221                       if (iso_flag)
 222                         string[i+1] =
 223                           (c < 0x20 || (c >= 0x7F && c < 0xa0)) ? '.' :c;
 224                       else
 225                         string[i+1] = (c < 0x20 || c >= 0x7F) ? '.' : c;
 226
 227                       printf ("%02x", c);
 228                     }
 229
 230                   if ((i&group_by) == group_by)
 231                     putchar (' ');
 232                 }
 233
 234               if (i)
 235                 puts (string);
 236
 237               if (c == EOF)
 238                 break;
 239
 240               address += 0x10;
 241
 242             }
 243         }
 244
 245       if (fp != stdin)
 246         fclose (fp);
 247
 248     } while (*argv != NULL);
 249   return EXIT_SUCCESS;
 250 }
 251
 252 void
 253 usage (void)
 254 {
 255   fprintf (stderr, "usage: %s [-de] [-iso]\n", progname);
 256   exit (EXIT_FAILURE);
 257 }
 258
 259
 260 /* hexl.c ends here */