libjava/gnu/gcj/convert/Convert.java

   1 /* Copyright (C) 1999, 2002, 2005, 2006, 2007, 2008, 2009
   2    Free Software Foundation
   3
   4    This file is part of libgcj.
   5
   6 This software is copyrighted work licensed under the terms of the
   7 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   8 details.  */
   9
  10 package gnu.gcj.convert;
  11 import java.io.*;
  12
  13 public class Convert
  14 {
  15   static void error (String message)
  16   {
  17     System.err.print("jv-convert: ");
  18     System.err.println(message);
  19     System.err.println("Try `jv-convert --help' for more information.");
  20     System.exit(1);
  21   }
  22
  23   static void help ()
  24   {
  25     System.out.println("Usage: jv-convert [OPTIONS] [INPUTFILE [OUTPUTFILE]]");
  26     System.out.println();
  27     System.out.println("Convert from one encoding to another.");
  28     System.out.println();
  29     System.out.println("   --encoding FROM");
  30     System.out.println("   --from FROM        use FROM as source encoding name");
  31     System.out.println("   --to TO            use TO as target encoding name");
  32     System.out.println("   -i FILE            read from FILE");
  33     System.out.println("   -o FILE            print output to FILE");
  34     System.out.println("   --reverse          swap FROM and TO encodings");
  35     System.out.println("   --help             print this help, then exit");
  36     System.out.println("   --version          print version number, then exit");
  37     System.out.println();
  38     System.out.println("`-' as a file name argument can be used to refer to stdin or stdout.");
  39     System.exit(0);
  40   }
  41
  42   static void version ()
  43   {
  44     System.out.println("jv-convert ("
  45                        + System.getProperty("java.vm.name")
  46                        + ") "
  47                        + System.getProperty("java.vm.version"));
  48     System.out.println();
  49     System.out.println("Copyright (C) 2009 Free Software Foundation, Inc.");
  50     System.out.println("This is free software; see the source for copying conditions.  There is NO");
  51     System.out.println("warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.");
  52     System.exit(0);
  53   }
  54
  55   static void missing (String arg)
  56   {
  57     error("missing arg after `" + arg + "' option");
  58   }
  59
  60   public static void main (String[] args)
  61   {
  62     String inName = "-";
  63     String outName = "-";
  64     String inEncodingName = null;
  65     String outEncodingName = "JavaSrc";
  66     int seenNames = 0;
  67     boolean reverse = false;
  68
  69     for (int i = 0;  i < args.length;  i++)
  70       {
  71         String arg = args[i];
  72         if (arg.length() == 0)
  73           error("zero-length argument");
  74         if (arg.charAt(0) == '-')
  75           {
  76             if (arg.equals("-encoding") || arg.equals("--encoding")
  77                 || args.equals("-from") || arg.equals("--from"))
  78               {
  79                 if (++i == args.length) missing(arg);
  80                 inEncodingName = args[i];
  81               }
  82             else if (arg.equals("-to") || arg.equals("--to"))
  83               {
  84                 if (++i == args.length) missing(arg);
  85                 outEncodingName = args[i];
  86               }
  87             else if (arg.equals("-i"))
  88               {
  89                 if (++i == args.length) missing(arg);
  90                 inName = args[i];
  91               }
  92             else if (arg.equals("-o"))
  93               {
  94                 if (++i == args.length) missing(arg);
  95                 outName = args[i];
  96               }
  97             else if (arg.equals("-reverse") || arg.equals("--reverse"))
  98               {
  99                 reverse = true;
 100               }
 101             else if (arg.equals("-help") || arg.equals("--help"))
 102               {
 103                 help ();
 104               }
 105             else if (arg.equals("-version") || arg.equals("--version"))
 106               {
 107                 version ();
 108               }
 109             else if (arg.equals("-"))
 110               {
 111                 switch (seenNames)
 112                   {
 113                   case 0:
 114                     inName = "-";
 115                     seenNames++;
 116                     break;
 117                   case 1:
 118                     outName = "-";
 119                     seenNames++;
 120                     break;
 121                   default:
 122                     error("too many `-' arguments");
 123                   }
 124               }
 125             else
 126               error("unrecognized argument `" + arg + "'");
 127           }
 128         else
 129           {
 130             switch (seenNames)
 131               {
 132               case 0:
 133                 inName = arg;
 134                 seenNames++;
 135                 break;
 136               case 1:
 137                 outName = arg;
 138                 seenNames++;
 139                 break;
 140               default:
 141                 error("too many filename arguments");
 142               }
 143           }
 144       }
 145
 146     if (reverse)
 147       {
 148         String tmp = inEncodingName;
 149         inEncodingName = outEncodingName;
 150         outEncodingName = tmp;
 151       }
 152
 153     try
 154       {
 155         InputStream inStream = inName.equals("-") ? System.in
 156           : new FileInputStream(inName);
 157         OutputStream outStream;
 158         if (outName.equals("-"))
 159           outStream = System.out;
 160         else
 161           outStream = new FileOutputStream(outName);
 162         InputStreamReader in
 163           = (inEncodingName == null
 164              ? new InputStreamReader(inStream)
 165              : new InputStreamReader(inStream, inEncodingName));
 166         OutputStreamWriter out
 167           = (outEncodingName == null
 168              ? new OutputStreamWriter(outStream)
 169              : new OutputStreamWriter(outStream, outEncodingName));
 170         char[] buffer = new char[2048];
 171         for (;;)
 172           {
 173             int count = in.read(buffer);
 174             if (count < 0)
 175               break;
 176             out.write(buffer, 0, count);
 177           }
 178
 179         in.close();
 180         out.close();
 181       }
 182     catch (java.io.IOException ex)
 183       {
 184         System.err.print("jv-convert exception: ");
 185         System.err.println(ex);
 186         System.exit(-1);
 187       }
 188   }
 189 }