/*

  * Copyright 2005,2009 Ivan SZKIBA

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *      http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.ini4j.spi;

 public class WinEscapeTool extends EscapeTool

 {

     private static final int ANSI_HEX_DIGITS = 2;

     private static final int ANSI_OCTAL_DIGITS = 3;

     private static final int OCTAL_RADIX = 8;

     private static final WinEscapeTool INSTANCE = new WinEscapeTool();

     public static WinEscapeTool getInstance()

     {

         return INSTANCE;

     }

     @Override void escapeBinary(StringBuilder buff, char c)

     {

         buff.append("\\x");

         buff.append(HEX[(c >>> HEX_DIGIT_3_OFFSET) & HEX_DIGIT_MASK]);

         buff.append(HEX[c & HEX_DIGIT_MASK]);

     }

     @Override int unescapeBinary(StringBuilder buff, char escapeType, String line, int index)

     {

         int ret = index;

         if (escapeType == 'x')

         {

             try

             {

                 buff.append((char) Integer.parseInt(line.substring(index, index + ANSI_HEX_DIGITS), HEX_RADIX));

                 ret = index + ANSI_HEX_DIGITS;

             }

             catch (Exception x)

             {

                 throw new IllegalArgumentException("Malformed \\xHH encoding.", x);

             }

         }

         else if (escapeType == 'o')

         {

             try

             {

                 buff.append((char) Integer.parseInt(line.substring(index, index + ANSI_OCTAL_DIGITS), OCTAL_RADIX));

                 ret = index + ANSI_OCTAL_DIGITS;

             }

             catch (Exception x)

             {

                 throw new IllegalArgumentException("Malformed \\oOO encoding.", x);

             }

         }

         return ret;

     }

 }