001: /*
002: * The Apache Software License, Version 1.1
003: *
004: * Copyright (c) 1999 The Apache Software Foundation. All rights
005: * reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * 1. Redistributions of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * 2. Redistributions in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * 3. The end-user documentation included with the redistribution, if
020: * any, must include the following acknowlegement:
021: * "This product includes software developed by the
022: * Apache Software Foundation (http://www.apache.org/)."
023: * Alternately, this acknowlegement may appear in the software itself,
024: * if and wherever such third-party acknowlegements normally appear.
025: *
026: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
027: * Foundation" must not be used to endorse or promote products derived
028: * from this software without prior written permission. For written
029: * permission, please contact apache@apache.org.
030: *
031: * 5. Products derived from this software may not be called "Apache"
032: * nor may "Apache" appear in their names without prior written
033: * permission of the Apache Group.
034: *
035: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
036: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
037: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
038: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
039: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
040: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
041: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
042: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
043: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
044: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
045: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
046: * SUCH DAMAGE.
047: * ====================================================================
048: *
049: * This software consists of voluntary contributions made by many
050: * individuals on behalf of the Apache Software Foundation. For more
051: * information on the Apache Software Foundation, please see
052: * <http://www.apache.org/>.
053: *
054: */
055:
056: package com.sun.portal.providers.jsp.jasper3.jasper.compiler;
057:
058: import java.io.OutputStream;
059: import java.io.IOException;
060: import java.io.Writer;
061:
062: import com.sun.portal.providers.jsp.jasper3.jasper.Constants;
063:
064: /**
065: * Used to escape unicode characters with \ u's.
066: *
067: * @author Anselm Baird-Smith
068: */
069: public class EscapeUnicodeWriter extends Writer {
070: private OutputStream out = null;
071: private byte bytes[] = new byte[6];
072:
073: public EscapeUnicodeWriter(OutputStream out) {
074: this .out = out;
075: }
076:
077: public void write(char buf[], int off, int len) throws IOException {
078: if (out == null)
079: throw new IOException(Constants
080: .getString("jsp.error.stream.closed"));
081:
082: int ci = off, end = off + len;
083: while (--len >= 0) {
084: int ch = buf[off++] & 0xffff;
085: /*
086: * Write out unicode characters as \u0000
087: */
088: if ((ch < 0x20 || ch > 0x7e)
089: && (ch != '\n' && ch != '\r' && ch != '\t')) {
090: bytes[0] = (byte) '\\';
091: bytes[1] = (byte) 'u';
092: bytes[2] = (byte) Character.forDigit(
093: (ch & 0xf000) >> 12, 16);
094: bytes[3] = (byte) Character.forDigit(
095: (ch & 0x0f00) >> 8, 16);
096: bytes[4] = (byte) Character.forDigit(
097: (ch & 0x00f0) >> 4, 16);
098: bytes[5] = (byte) Character.forDigit(
099: (ch & 0x000f) >> 0, 16);
100: out.write(bytes);
101: } else {
102: out.write((byte) ch);
103: }
104: }
105: }
106:
107: public void flush() throws IOException {
108: out.flush();
109: }
110:
111: public void close() throws IOException {
112: if (out == null)
113: return;
114: out.close();
115: out = null;
116: }
117: }
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