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/*
* $Header: /cvsroot/jetty/Jetty3/src/org/apache/jasper/compiler/EscapeUnicodeWriter.java,v 1.1 2000/10/09 17:57:40 gregwilkins Exp $
* $Revision: 1.1 $
* $Date: 2000/10/09 17:57:40 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact
EscapeUnicodeWriter.java为[网学网-网友上传,谢谢支持]。.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package org.apache.jasper.compiler;
import java.io.OutputStream;
import java.io.IOException;
import java.io.Writer;
import org.apache.jasper.Constants;
/**
* Used to escape unicode characters with \ u's.
*
* @author Anselm Baird-Smith
*/
public class EscapeUnicodeWriter extends Writer {
private OutputStream out = null;
private byte bytes[] = new byte[6];
public EscapeUnicodeWriter(OutputStream out) {
this.out = out;
}
public void write(char buf[], int off, int len)
throws IOException
{
if (out == null)
throw new IOException(Constants.getString("jsp.error.stream.closed"));
int ci = off, end = off + len;
while ( --len >= 0 ) {
int ch = buf[off++] & 0xffff;
/*
* Write out unicode characters as \u0000
*/
if ((ch < 0x20 || ch > 0x7e) &&
(ch != '\n' && ch != '\r' && ch != '\t')) {
bytes[0] = (byte) '\\';
bytes[1] = (byte) 'u';
bytes[2] = (byte) Character.forDigit((ch & 0xf000) >> 12, 16);
bytes[3] = (byte) Character.forDigit((ch & 0x0f00) >> 8, 16);
bytes[4] = (byte) Character.forDigit((ch & 0x00f0) >> 4, 16);
bytes[5] = (byte) Character.forDigit((ch & 0x000f) >> 0, 16);
out.write(bytes);
} else {
out.write((byte) ch);
}
}
}
public void flush() throws IOException {
out.flush();
}
public void close()
throws IOException
{
if (out == null)
return;
out.close();
out = null;
}
}
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