1 //
2 // ========================================================================
3 // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd.
4 // ------------------------------------------------------------------------
5 // All rights reserved. This program and the accompanying materials
6 // are made available under the terms of the Eclipse Public License v1.0
7 // and Apache License v2.0 which accompanies this distribution.
8 //
9 // The Eclipse Public License is available at
10 // http://www.eclipse.org/legal/epl-v10.html
11 //
12 // The Apache License v2.0 is available at
13 // http://www.opensource.org/licenses/apache2.0.php
14 //
15 // You may elect to redistribute this code under either of these licenses.
16 // ========================================================================
17 //
18
19
20 package org.eclipse.jetty.http2.hpack;
21
22 import java.nio.ByteBuffer;
23
24 import org.eclipse.jetty.http.HttpFieldPreEncoder;
25 import org.eclipse.jetty.http.HttpHeader;
26 import org.eclipse.jetty.http.HttpVersion;
27 import org.eclipse.jetty.util.BufferUtil;
28
29
30 /* ------------------------------------------------------------ */
31 /**
32 */
33 public class HpackFieldPreEncoder implements HttpFieldPreEncoder
34 {
35 /* ------------------------------------------------------------ */
36 /**
37 * @see org.eclipse.jetty.http.HttpFieldPreEncoder#getHttpVersion()
38 */
39 @Override
40 public HttpVersion getHttpVersion()
41 {
42 return HttpVersion.HTTP_2;
43 }
44
45 /* ------------------------------------------------------------ */
46 /**
47 * @see org.eclipse.jetty.http.HttpFieldPreEncoder#getEncodedField(org.eclipse.jetty.http.HttpHeader, java.lang.String, java.lang.String)
48 */
49 @Override
50 public byte[] getEncodedField(HttpHeader header, String name, String value)
51 {
52 boolean not_indexed=HpackEncoder.__DO_NOT_INDEX.contains(header);
53
54 ByteBuffer buffer = BufferUtil.allocate(name.length()+value.length()+10);
55 BufferUtil.clearToFill(buffer);
56 boolean huffman;
57 int bits;
58
59 if (not_indexed)
60 {
61 // Non indexed field
62 boolean never_index=HpackEncoder.__NEVER_INDEX.contains(header);
63 huffman=!HpackEncoder.__DO_NOT_HUFFMAN.contains(header);
64 buffer.put(never_index?(byte)0x10:(byte)0x00);
65 bits=4;
66 }
67 else if (header==HttpHeader.CONTENT_LENGTH && value.length()>1)
68 {
69 // Non indexed content length for 2 digits or more
70 buffer.put((byte)0x00);
71 huffman=true;
72 bits=4;
73 }
74 else
75 {
76 // indexed
77 buffer.put((byte)0x40);
78 huffman=!HpackEncoder.__DO_NOT_HUFFMAN.contains(header);
79 bits=6;
80 }
81
82 int name_idx=HpackContext.staticIndex(header);
83 if (name_idx>0)
84 NBitInteger.encode(buffer,bits,name_idx);
85 else
86 {
87 buffer.put((byte)0x80);
88 NBitInteger.encode(buffer,7,Huffman.octetsNeededLC(name));
89 Huffman.encodeLC(buffer,name);
90 }
91
92 HpackEncoder.encodeValue(buffer,huffman,value);
93
94 BufferUtil.flipToFlush(buffer,0);
95 return BufferUtil.toArray(buffer);
96 }
97 }