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Java > Open Source Codes > org > pdfbox > filter > ASCII85Filter


1 /**
2  * Copyright (c) 2003, www.pdfbox.org
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice,
9  * this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  * 3. Neither the name of pdfbox; nor the names of its
14  * contributors may be used to endorse or promote products derived from this
15  * software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20  * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
24  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  * http://www.pdfbox.org
29  *
30  */
31 package org.pdfbox.filter;
32
33 import java.io.IOException JavaDoc;
34 import java.io.InputStream JavaDoc;
35 import java.io.OutputStream JavaDoc;
36
37 import org.pdfbox.io.ASCII85InputStream;
38 import org.pdfbox.io.ASCII85OutputStream;
39
40 import org.pdfbox.cos.COSDictionary;
41
42 /**
43  * This is the used for the ASCIIHexDecode filter.
44  *
45  * @author <a HREF="mailto:ben@benlitchfield.com">Ben Litchfield</a>
46  * @version $Revision: 1.7 $
47  */
48 public class ASCII85Filter implements Filter
49 {
50     /**
51      * This will decode some compressed data.
52      *
53      * @param compressedData The compressed byte stream.
54      * @param result The place to write the uncompressed byte stream.
55      * @param options The options to use to encode the data.
56      *
57      * @throws IOException If there is an error decompressing the stream.
58      */
59     public void decode( InputStream JavaDoc compressedData, OutputStream JavaDoc result, COSDictionary options ) throws IOException JavaDoc
60     {
61         ASCII85InputStream is = null;
62         try
63         {
64             is = new ASCII85InputStream(compressedData);
65             byte[] buffer = new byte[1024];
66             int amountRead = 0;
67             while( (amountRead = is.read( buffer, 0, 1024) ) != -1 )
68             {
69                 result.write(buffer, 0, amountRead);
70             }
71             result.flush();
72         }
73         finally
74         {
75             if( is != null )
76             {
77                 is.close();
78             }
79         }
80     }
81
82     /**
83      * This will encode some data.
84      *
85      * @param rawData The raw data to encode.
86      * @param result The place to write to encoded results to.
87      * @param options The options to use to encode the data.
88      *
89      * @throws IOException If there is an error compressing the stream.
90      */
91     public void encode( InputStream JavaDoc rawData, OutputStream JavaDoc result, COSDictionary options ) throws IOException JavaDoc
92     {
93         ASCII85OutputStream os = new ASCII85OutputStream(result);
94         byte[] buffer = new byte[1024];
95         int amountRead = 0;
96         while( (amountRead = rawData.read( buffer, 0, 1024 )) != -1 )
97         {
98             os.write( buffer, 0, amountRead );
99         }
100         os.close();
101         result.flush();
102     }
103 }
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