content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 mf.org.apache.xerces.impl.xs;
  
  /**
   * @version $Id: FilePathToURI.java 937829 2010-04-25 17:11:12Z mrglavas $
   * @xerces.internal
   */
  final class FilePathToURI {
  
      // which ASCII characters need to be escaped
      private static boolean gNeedEscaping[] = new boolean[128];
      // the first hex character if a character needs to be escaped
      private static char gAfterEscaping1[] = new char[128];
      // the second hex character if a character needs to be escaped
      private static char gAfterEscaping2[] = new char[128];
      private static char[] gHexChs = {'0', '1', '2', '3', '4', '5', '6', '7',
              '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
  
      // initialize the above 3 arrays
      static {
          for (int i = 0; i <= 0x1f; i++) {
              gNeedEscaping[i] = true;
              gAfterEscaping1[i] = gHexChs[i >> 4];
              gAfterEscaping2[i] = gHexChs[i & 0xf];
          }
          gNeedEscaping[0x7f] = true;
          gAfterEscaping1[0x7f] = '7';
          gAfterEscaping2[0x7f] = 'F';
          char[] escChs = {' ', '<', '>', '#', '%', '"', '{', '}',
                  '|', '\\', '^', '~', '[', ']', '`'};
          int len = escChs.length;
          char ch;
          for (int i = 0; i < len; i++) {
              ch = escChs[i];
              gNeedEscaping[ch] = true;
              gAfterEscaping1[ch] = gHexChs[ch >> 4];
              gAfterEscaping2[ch] = gHexChs[ch & 0xf];
          }
      }
  
      private FilePathToURI() {
      }
  
      // To escape a file path to a URI, by using %HH to represent
      // special ASCII characters: 0x00~0x1F, 0x7F, ' ', '<', '>', '#', '%'
      // and '"' and non-ASCII characters (whose value >= 128).
      public static String filepath2URI(String path) {
          // return null if path is null.
          if (path == null)
              return null;
  
          char separator = java.io.File.separatorChar;
          path = path.replace(separator, '/');
  
          int len = path.length(), ch;
          StringBuffer buffer = new StringBuffer(len * 3);
          buffer.append("file://");
          // change C:/blah to /C:/blah
          if (len >= 2 && path.charAt(1) == ':') {
              ch = Character.toUpperCase(path.charAt(0));
              if (ch >= 'A' && ch <= 'Z') {
                  buffer.append('/');
              }
          }
  
          // for each character in the path
          int i = 0;
          for (; i < len; i++) {
              ch = path.charAt(i);
              // if it's not an ASCII character, break here, and use UTF-8 encoding
              if (ch >= 128)
                  break;
              if (gNeedEscaping[ch]) {
                  buffer.append('%');
                  buffer.append(gAfterEscaping1[ch]);
                  buffer.append(gAfterEscaping2[ch]);
                  // record the fact that it's escaped
              } else {
                  buffer.append((char) ch);
              }
          }
  
          // we saw some non-ascii character
          if (i < len) {
              // get UTF-8 bytes for the remaining sub-string
              byte[] bytes = null;
              byte b;
              try {
                  bytes = path.substring(i).getBytes("UTF-8");
              } catch (java.io.UnsupportedEncodingException e) {
                  // should never happen
                  return path;
              }
              len = bytes.length;
  
              // for each byte
              for (i = 0; i < len; i++) {
                  b = bytes[i];
                  // for non-ascii character: make it positive, then escape
                  if (b < 0) {
                      ch = b + 256;
                      buffer.append('%');
                      buffer.append(gHexChs[ch >> 4]);
                      buffer.append(gHexChs[ch & 0xf]);
                  } else if (gNeedEscaping[b]) {
                      buffer.append('%');
                      buffer.append(gAfterEscaping1[b]);
                      buffer.append(gAfterEscaping2[b]);
                  } else {
                      buffer.append((char) b);
                  }
              }
          }
  
          return buffer.toString();
      }
  
  } //FilePathToURI
  