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Java > Open Source Codes > org > apache > fop > render > ps > ASCIIHexOutputStream


1 /*
2  * $Id: ASCIIHexOutputStream.java,v 1.1.2.2 2003/02/25 14:58:23 jeremias Exp $
3  * ============================================================================
4  * The Apache Software License, Version 1.1
5  * ============================================================================
6  *
7  * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without modifica-
10  * tion, are permitted provided that the following conditions are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright notice,
13  * this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  *
19  * 3. The end-user documentation included with the redistribution, if any, must
20  * include the following acknowledgment: "This product includes software
21  * developed by the Apache Software Foundation (http://www.apache.org/)."
22  * Alternately, this acknowledgment may appear in the software itself, if
23  * and wherever such third-party acknowledgments normally appear.
24  *
25  * 4. The names "FOP" and "Apache Software Foundation" must not be used to
26  * endorse or promote products derived from this software without prior
27  * written permission. For written permission, please contact
28  * apache@apache.org.
29  *
30  * 5. Products derived from this software may not be called "Apache", nor may
31  * "Apache" appear in their name, without prior written permission of the
32  * Apache Software Foundation.
33  *
34  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
35  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
36  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
37  * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
38  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
39  * DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
40  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
41  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
42  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
43  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
44  * ============================================================================
45  *
46  * This software consists of voluntary contributions made by many individuals
47  * on behalf of the Apache Software Foundation and was originally created by
48  * James Tauber <jtauber@jtauber.com>. For more information on the Apache
49  * Software Foundation, please see <http://www.apache.org/>.
50  */
51 package org.apache.fop.render.ps;
52
53 import java.io.OutputStream JavaDoc;
54 import java.io.FilterOutputStream JavaDoc;
55 import java.io.IOException JavaDoc;
56
57 /**
58  * This class applies a ASCII Hex encoding to the stream.
59  *
60  * @author Jeremias Maerki
61  * @version $Id: ASCIIHexOutputStream.java,v 1.1.2.2 2003/02/25 14:58:23 jeremias Exp $
62  */
63 public class ASCIIHexOutputStream extends FilterOutputStream JavaDoc {
64
65     private static final int EOL = 0x0A; //"\n"
66 private static final int EOD = 0x3E; //">"
67 private static final int ZERO = 0x30; //"0"
68 private static final int NINE = 0x39; //"9"
69 private static final int A = 0x41; //"A"
70 private static final int ADIFF = A - NINE -1;
71
72     private int posinline = 0;
73
74
75     public ASCIIHexOutputStream(OutputStream JavaDoc out) {
76         super(out);
77     }
78
79
80     public void write(int b) throws IOException JavaDoc {
81         b &= 0xFF;
82
83         int digit1 = ((b & 0xF0) >> 4) + ZERO;
84         if (digit1 > NINE) digit1 += ADIFF;
85         out.write(digit1);
86
87         int digit2 = (b & 0x0F) + ZERO;
88         if (digit2 > NINE) digit2 += ADIFF;
89         out.write(digit2);
90
91         posinline++;
92         checkLineWrap();
93     }
94
95
96     private void checkLineWrap() throws IOException JavaDoc {
97         //Maximum line length is 80 characters
98 if (posinline >= 40) {
99             out.write(EOL);
100             posinline = 0;
101         }
102     }
103
104
105     public void finalizeStream() throws IOException JavaDoc {
106         checkLineWrap();
107         //Write closing character ">"
108 super.write(EOD);
109
110         flush();
111         if (out instanceof Finalizable) {
112             ((Finalizable)out).finalizeStream();
113         }
114     }
115
116
117     public void close() throws IOException JavaDoc {
118         finalizeStream();
119         super.close();
120     }
121
122
123 }
124
125
126
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