Program: 72576
Project: 72576
Buggy source:
/** 
 * Check the URL input for a DTD.  Only the first 5 lines are read from the URL.  Any text that matches <code>&lt;?xml.*?&gt;</code> is removed before checking.
 * @param input The DTD to check.
 * @param dtdStart The start of the DTD, typically "&lt;!DOCTYPE".
 * @param dtdEndRegExp The optional ending regular expression.  Ifthis parameter is null, then it is ignored.
 * @return True if the input starts with dtdStart and, if dtdEndRegExpis non-null, ends with dtdEndRegExp.
 * @exception IOException if there is a problem opening or readingthe input.
 */
public static boolean checkForDTD(URL input,String dtdStart,String dtdEndRegExp) throws IOException {
  InputStream stream=null;
  try {
    stream=input.openStream();
  }
 catch (  AccessControlException ex) {
    AccessControlException exception=new AccessControlException("String_Node_Str" + input + "String_Node_Str");
    exception.initCause(ex);
    throw exception;
  }
catch (  IOException ex) {
    URL anotherURL=ClassUtilities.jarURLEntryResource(input.toExternalForm());
    if (anotherURL == null) {
      throw ex;
    }
    stream=anotherURL.openStream();
  }
  boolean foundDTD=false;
  BufferedReader reader=null;
  try {
    reader=new BufferedReader(new InputStreamReader(stream));
    int lineCount=0;
    while (lineCount < 5) {
      String contents=reader.readLine();
      lineCount++;
      if (contents == null) {
        break;
      }
      contents=contents.replaceFirst("String_Node_Str","String_Node_Str");
      if (dtdEndRegExp != null) {
        if (contents.startsWith(dtdStart) && contents.matches(dtdEndRegExp)) {
          foundDTD=true;
          break;
        }
 else {
          if (contents.startsWith(dtdStart)) {
            contents+=reader.readLine();
            if (contents.matches(dtdEndRegExp)) {
              foundDTD=true;
              break;
            }
          }
        }
      }
 else       if (contents.startsWith(dtdStart)) {
        foundDTD=true;
        break;
      }
    }
  }
  finally {
    if (reader != null) {
      reader.close();
    }
  }
  return foundDTD;
}

Fixed version (ground truth):
/** 
 * Check the URL input for a DTD.  Only the first 5 lines are read from the URL.  Any text that matches <code>&lt;?xml.*?&gt;</code> is removed before checking.
 * @param input The DTD to check.
 * @param dtdStart The start of the DTD, typically "&lt;!DOCTYPE".
 * @param dtdEndRegExp The optional ending regular expression.  Ifthis parameter is null, then it is ignored.
 * @return True if the input starts with dtdStart and, if dtdEndRegExpis non-null, ends with dtdEndRegExp.
 * @exception IOException if there is a problem opening or readingthe input.
 */
public static boolean checkForDTD(URL input,String dtdStart,String dtdEndRegExp) throws IOException {
  InputStream stream=null;
  try {
    stream=input.openStream();
  }
 catch (  AccessControlException ex) {
    AccessControlException exception=new AccessControlException("String_Node_Str" + input + "String_Node_Str");
    exception.initCause(ex);
    throw exception;
  }
catch (  IOException ex) {
    URL anotherURL=ClassUtilities.jarURLEntryResource(input.toExternalForm());
    if (anotherURL == null) {
      throw ex;
    }
    stream=anotherURL.openStream();
  }
  boolean foundDTD=false;
  BufferedReader reader=null;
  try {
    reader=new BufferedReader(new InputStreamReader(stream,java.nio.charset.Charset.defaultCharset()));
    int lineCount=0;
    while (lineCount < 5) {
      String contents=reader.readLine();
      lineCount++;
      if (contents == null) {
        break;
      }
      contents=contents.replaceFirst("String_Node_Str","String_Node_Str");
      if (dtdEndRegExp != null) {
        if (contents.startsWith(dtdStart) && contents.matches(dtdEndRegExp)) {
          foundDTD=true;
          break;
        }
 else {
          if (contents.startsWith(dtdStart)) {
            contents+=reader.readLine();
            if (contents.matches(dtdEndRegExp)) {
              foundDTD=true;
              break;
            }
          }
        }
      }
 else       if (contents.startsWith(dtdStart)) {
        foundDTD=true;
        break;
      }
    }
  }
  finally {
    if (reader != null) {
      reader.close();
    }
  }
  return foundDTD;
}