author | prappo |
Tue, 29 May 2018 23:47:07 +0100 | |
branch | http-client-branch |
changeset 56623 | 1d020b5d73f1 |
parent 49944 | 4690a2871b44 |
child 56639 | bd0dba2a0d51 |
permissions | -rw-r--r-- |
49944 | 1 |
/* |
2 |
* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. |
|
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
|
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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||
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package jdk.internal.net.http.hpack; |
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56623
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
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parents:
49944
diff
changeset
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import jdk.internal.net.http.hpack.HPACK.BufferUpdateConsumer; |
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49944 | 30 |
import java.io.IOException; |
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import java.nio.ByteBuffer; |
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import java.util.List; |
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import java.util.Objects; |
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||
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http-client-branch: review comment - HPACK misc. improvements
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49944
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import static jdk.internal.net.http.hpack.HPACK.bytesForBits; |
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36 |
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49944 | 37 |
public final class QuickHuffman { |
38 |
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/* |
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* Mapping of characters to their code information. Code information |
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* consists of a code value and a code length. Both components are packed in |
1d020b5d73f1
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* a single long as follows: |
49944 | 43 |
* |
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* MSB LSB |
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* +----------------+----------------+ |
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* |~code | length~| |
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* +----------------+----------------+ |
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* |<----- 32 ----->|<----- 32 ----->| |
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* |<------------- 64 -------------->| |
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* |
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* The leftmost 32 bits hold the code value. This value is aligned left (or |
1d020b5d73f1
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* MSB). The rightmost 32 bits hold the code length. This length is aligned |
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* right (or LSB). Such structure is possible thanks to codes being up to 30 |
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* bits long and their lengths being up to 5 bits long (length = 5..30). |
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* This allows both components to fit into long and, thus, better locality. |
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* |
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* Input strings never contain EOS. Thus there's no need to provide EOS |
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* mapping. Hence, the length of the array is 256, not 257. |
49944 | 59 |
*/ |
60 |
private static final long[] codes = new long[256]; |
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61 |
||
62 |
private static long codeValueOf(char c) { |
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return codes[c] & 0xffffffff00000000L; |
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} |
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66 |
private static long codeLengthOf(char c) { |
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return codes[c] & 0x00000000ffffffffL; |
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} |
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private static final int EOS_LENGTH = 30; |
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private static final int EOS_LSB = 0x3fffffff; |
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// EOS_LSB is casted to long before the shift, to allow long shift (6 bits) |
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// instead of int shift (5 bits): |
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private static final long EOS_MSB = ((long) EOS_LSB) << (64 - EOS_LENGTH); |
49944 | 75 |
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/* |
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* Huffman trie. |
49944 | 78 |
* |
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* The root node leads to 257 descendant leaf nodes, of which 256 nodes |
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* correspond to characters and 1 node correspond to EOS. |
49944 | 81 |
*/ |
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private static final Node root = buildTrie(); |
49944 | 83 |
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84 |
private static Node buildTrie() { |
49944 | 85 |
TemporaryNode tmpRoot = new TemporaryNode(); |
86 |
addChar(tmpRoot, 0, 0x1ff8, 13); |
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87 |
addChar(tmpRoot, 1, 0x7fffd8, 23); |
|
88 |
addChar(tmpRoot, 2, 0xfffffe2, 28); |
|
89 |
addChar(tmpRoot, 3, 0xfffffe3, 28); |
|
90 |
addChar(tmpRoot, 4, 0xfffffe4, 28); |
|
91 |
addChar(tmpRoot, 5, 0xfffffe5, 28); |
|
92 |
addChar(tmpRoot, 6, 0xfffffe6, 28); |
|
93 |
addChar(tmpRoot, 7, 0xfffffe7, 28); |
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94 |
addChar(tmpRoot, 8, 0xfffffe8, 28); |
|
95 |
addChar(tmpRoot, 9, 0xffffea, 24); |
|
96 |
addChar(tmpRoot, 10, 0x3ffffffc, 30); |
|
97 |
addChar(tmpRoot, 11, 0xfffffe9, 28); |
|
98 |
addChar(tmpRoot, 12, 0xfffffea, 28); |
|
99 |
addChar(tmpRoot, 13, 0x3ffffffd, 30); |
|
100 |
addChar(tmpRoot, 14, 0xfffffeb, 28); |
|
101 |
addChar(tmpRoot, 15, 0xfffffec, 28); |
|
102 |
addChar(tmpRoot, 16, 0xfffffed, 28); |
|
103 |
addChar(tmpRoot, 17, 0xfffffee, 28); |
|
104 |
addChar(tmpRoot, 18, 0xfffffef, 28); |
|
105 |
addChar(tmpRoot, 19, 0xffffff0, 28); |
|
106 |
addChar(tmpRoot, 20, 0xffffff1, 28); |
|
107 |
addChar(tmpRoot, 21, 0xffffff2, 28); |
|
108 |
addChar(tmpRoot, 22, 0x3ffffffe, 30); |
|
109 |
addChar(tmpRoot, 23, 0xffffff3, 28); |
|
110 |
addChar(tmpRoot, 24, 0xffffff4, 28); |
|
111 |
addChar(tmpRoot, 25, 0xffffff5, 28); |
|
112 |
addChar(tmpRoot, 26, 0xffffff6, 28); |
|
113 |
addChar(tmpRoot, 27, 0xffffff7, 28); |
|
114 |
addChar(tmpRoot, 28, 0xffffff8, 28); |
|
115 |
addChar(tmpRoot, 29, 0xffffff9, 28); |
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116 |
addChar(tmpRoot, 30, 0xffffffa, 28); |
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117 |
addChar(tmpRoot, 31, 0xffffffb, 28); |
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118 |
addChar(tmpRoot, 32, 0x14, 6); |
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119 |
addChar(tmpRoot, 33, 0x3f8, 10); |
|
120 |
addChar(tmpRoot, 34, 0x3f9, 10); |
|
121 |
addChar(tmpRoot, 35, 0xffa, 12); |
|
122 |
addChar(tmpRoot, 36, 0x1ff9, 13); |
|
123 |
addChar(tmpRoot, 37, 0x15, 6); |
|
124 |
addChar(tmpRoot, 38, 0xf8, 8); |
|
125 |
addChar(tmpRoot, 39, 0x7fa, 11); |
|
126 |
addChar(tmpRoot, 40, 0x3fa, 10); |
|
127 |
addChar(tmpRoot, 41, 0x3fb, 10); |
|
128 |
addChar(tmpRoot, 42, 0xf9, 8); |
|
129 |
addChar(tmpRoot, 43, 0x7fb, 11); |
|
130 |
addChar(tmpRoot, 44, 0xfa, 8); |
|
131 |
addChar(tmpRoot, 45, 0x16, 6); |
|
132 |
addChar(tmpRoot, 46, 0x17, 6); |
|
133 |
addChar(tmpRoot, 47, 0x18, 6); |
|
134 |
addChar(tmpRoot, 48, 0x0, 5); |
|
135 |
addChar(tmpRoot, 49, 0x1, 5); |
|
136 |
addChar(tmpRoot, 50, 0x2, 5); |
|
137 |
addChar(tmpRoot, 51, 0x19, 6); |
|
138 |
addChar(tmpRoot, 52, 0x1a, 6); |
|
139 |
addChar(tmpRoot, 53, 0x1b, 6); |
|
140 |
addChar(tmpRoot, 54, 0x1c, 6); |
|
141 |
addChar(tmpRoot, 55, 0x1d, 6); |
|
142 |
addChar(tmpRoot, 56, 0x1e, 6); |
|
143 |
addChar(tmpRoot, 57, 0x1f, 6); |
|
144 |
addChar(tmpRoot, 58, 0x5c, 7); |
|
145 |
addChar(tmpRoot, 59, 0xfb, 8); |
|
146 |
addChar(tmpRoot, 60, 0x7ffc, 15); |
|
147 |
addChar(tmpRoot, 61, 0x20, 6); |
|
148 |
addChar(tmpRoot, 62, 0xffb, 12); |
|
149 |
addChar(tmpRoot, 63, 0x3fc, 10); |
|
150 |
addChar(tmpRoot, 64, 0x1ffa, 13); |
|
151 |
addChar(tmpRoot, 65, 0x21, 6); |
|
152 |
addChar(tmpRoot, 66, 0x5d, 7); |
|
153 |
addChar(tmpRoot, 67, 0x5e, 7); |
|
154 |
addChar(tmpRoot, 68, 0x5f, 7); |
|
155 |
addChar(tmpRoot, 69, 0x60, 7); |
|
156 |
addChar(tmpRoot, 70, 0x61, 7); |
|
157 |
addChar(tmpRoot, 71, 0x62, 7); |
|
158 |
addChar(tmpRoot, 72, 0x63, 7); |
|
159 |
addChar(tmpRoot, 73, 0x64, 7); |
|
160 |
addChar(tmpRoot, 74, 0x65, 7); |
|
161 |
addChar(tmpRoot, 75, 0x66, 7); |
|
162 |
addChar(tmpRoot, 76, 0x67, 7); |
|
163 |
addChar(tmpRoot, 77, 0x68, 7); |
|
164 |
addChar(tmpRoot, 78, 0x69, 7); |
|
165 |
addChar(tmpRoot, 79, 0x6a, 7); |
|
166 |
addChar(tmpRoot, 80, 0x6b, 7); |
|
167 |
addChar(tmpRoot, 81, 0x6c, 7); |
|
168 |
addChar(tmpRoot, 82, 0x6d, 7); |
|
169 |
addChar(tmpRoot, 83, 0x6e, 7); |
|
170 |
addChar(tmpRoot, 84, 0x6f, 7); |
|
171 |
addChar(tmpRoot, 85, 0x70, 7); |
|
172 |
addChar(tmpRoot, 86, 0x71, 7); |
|
173 |
addChar(tmpRoot, 87, 0x72, 7); |
|
174 |
addChar(tmpRoot, 88, 0xfc, 8); |
|
175 |
addChar(tmpRoot, 89, 0x73, 7); |
|
176 |
addChar(tmpRoot, 90, 0xfd, 8); |
|
177 |
addChar(tmpRoot, 91, 0x1ffb, 13); |
|
178 |
addChar(tmpRoot, 92, 0x7fff0, 19); |
|
179 |
addChar(tmpRoot, 93, 0x1ffc, 13); |
|
180 |
addChar(tmpRoot, 94, 0x3ffc, 14); |
|
181 |
addChar(tmpRoot, 95, 0x22, 6); |
|
182 |
addChar(tmpRoot, 96, 0x7ffd, 15); |
|
183 |
addChar(tmpRoot, 97, 0x3, 5); |
|
184 |
addChar(tmpRoot, 98, 0x23, 6); |
|
185 |
addChar(tmpRoot, 99, 0x4, 5); |
|
186 |
addChar(tmpRoot, 100, 0x24, 6); |
|
187 |
addChar(tmpRoot, 101, 0x5, 5); |
|
188 |
addChar(tmpRoot, 102, 0x25, 6); |
|
189 |
addChar(tmpRoot, 103, 0x26, 6); |
|
190 |
addChar(tmpRoot, 104, 0x27, 6); |
|
191 |
addChar(tmpRoot, 105, 0x6, 5); |
|
192 |
addChar(tmpRoot, 106, 0x74, 7); |
|
193 |
addChar(tmpRoot, 107, 0x75, 7); |
|
194 |
addChar(tmpRoot, 108, 0x28, 6); |
|
195 |
addChar(tmpRoot, 109, 0x29, 6); |
|
196 |
addChar(tmpRoot, 110, 0x2a, 6); |
|
197 |
addChar(tmpRoot, 111, 0x7, 5); |
|
198 |
addChar(tmpRoot, 112, 0x2b, 6); |
|
199 |
addChar(tmpRoot, 113, 0x76, 7); |
|
200 |
addChar(tmpRoot, 114, 0x2c, 6); |
|
201 |
addChar(tmpRoot, 115, 0x8, 5); |
|
202 |
addChar(tmpRoot, 116, 0x9, 5); |
|
203 |
addChar(tmpRoot, 117, 0x2d, 6); |
|
204 |
addChar(tmpRoot, 118, 0x77, 7); |
|
205 |
addChar(tmpRoot, 119, 0x78, 7); |
|
206 |
addChar(tmpRoot, 120, 0x79, 7); |
|
207 |
addChar(tmpRoot, 121, 0x7a, 7); |
|
208 |
addChar(tmpRoot, 122, 0x7b, 7); |
|
209 |
addChar(tmpRoot, 123, 0x7ffe, 15); |
|
210 |
addChar(tmpRoot, 124, 0x7fc, 11); |
|
211 |
addChar(tmpRoot, 125, 0x3ffd, 14); |
|
212 |
addChar(tmpRoot, 126, 0x1ffd, 13); |
|
213 |
addChar(tmpRoot, 127, 0xffffffc, 28); |
|
214 |
addChar(tmpRoot, 128, 0xfffe6, 20); |
|
215 |
addChar(tmpRoot, 129, 0x3fffd2, 22); |
|
216 |
addChar(tmpRoot, 130, 0xfffe7, 20); |
|
217 |
addChar(tmpRoot, 131, 0xfffe8, 20); |
|
218 |
addChar(tmpRoot, 132, 0x3fffd3, 22); |
|
219 |
addChar(tmpRoot, 133, 0x3fffd4, 22); |
|
220 |
addChar(tmpRoot, 134, 0x3fffd5, 22); |
|
221 |
addChar(tmpRoot, 135, 0x7fffd9, 23); |
|
222 |
addChar(tmpRoot, 136, 0x3fffd6, 22); |
|
223 |
addChar(tmpRoot, 137, 0x7fffda, 23); |
|
224 |
addChar(tmpRoot, 138, 0x7fffdb, 23); |
|
225 |
addChar(tmpRoot, 139, 0x7fffdc, 23); |
|
226 |
addChar(tmpRoot, 140, 0x7fffdd, 23); |
|
227 |
addChar(tmpRoot, 141, 0x7fffde, 23); |
|
228 |
addChar(tmpRoot, 142, 0xffffeb, 24); |
|
229 |
addChar(tmpRoot, 143, 0x7fffdf, 23); |
|
230 |
addChar(tmpRoot, 144, 0xffffec, 24); |
|
231 |
addChar(tmpRoot, 145, 0xffffed, 24); |
|
232 |
addChar(tmpRoot, 146, 0x3fffd7, 22); |
|
233 |
addChar(tmpRoot, 147, 0x7fffe0, 23); |
|
234 |
addChar(tmpRoot, 148, 0xffffee, 24); |
|
235 |
addChar(tmpRoot, 149, 0x7fffe1, 23); |
|
236 |
addChar(tmpRoot, 150, 0x7fffe2, 23); |
|
237 |
addChar(tmpRoot, 151, 0x7fffe3, 23); |
|
238 |
addChar(tmpRoot, 152, 0x7fffe4, 23); |
|
239 |
addChar(tmpRoot, 153, 0x1fffdc, 21); |
|
240 |
addChar(tmpRoot, 154, 0x3fffd8, 22); |
|
241 |
addChar(tmpRoot, 155, 0x7fffe5, 23); |
|
242 |
addChar(tmpRoot, 156, 0x3fffd9, 22); |
|
243 |
addChar(tmpRoot, 157, 0x7fffe6, 23); |
|
244 |
addChar(tmpRoot, 158, 0x7fffe7, 23); |
|
245 |
addChar(tmpRoot, 159, 0xffffef, 24); |
|
246 |
addChar(tmpRoot, 160, 0x3fffda, 22); |
|
247 |
addChar(tmpRoot, 161, 0x1fffdd, 21); |
|
248 |
addChar(tmpRoot, 162, 0xfffe9, 20); |
|
249 |
addChar(tmpRoot, 163, 0x3fffdb, 22); |
|
250 |
addChar(tmpRoot, 164, 0x3fffdc, 22); |
|
251 |
addChar(tmpRoot, 165, 0x7fffe8, 23); |
|
252 |
addChar(tmpRoot, 166, 0x7fffe9, 23); |
|
253 |
addChar(tmpRoot, 167, 0x1fffde, 21); |
|
254 |
addChar(tmpRoot, 168, 0x7fffea, 23); |
|
255 |
addChar(tmpRoot, 169, 0x3fffdd, 22); |
|
256 |
addChar(tmpRoot, 170, 0x3fffde, 22); |
|
257 |
addChar(tmpRoot, 171, 0xfffff0, 24); |
|
258 |
addChar(tmpRoot, 172, 0x1fffdf, 21); |
|
259 |
addChar(tmpRoot, 173, 0x3fffdf, 22); |
|
260 |
addChar(tmpRoot, 174, 0x7fffeb, 23); |
|
261 |
addChar(tmpRoot, 175, 0x7fffec, 23); |
|
262 |
addChar(tmpRoot, 176, 0x1fffe0, 21); |
|
263 |
addChar(tmpRoot, 177, 0x1fffe1, 21); |
|
264 |
addChar(tmpRoot, 178, 0x3fffe0, 22); |
|
265 |
addChar(tmpRoot, 179, 0x1fffe2, 21); |
|
266 |
addChar(tmpRoot, 180, 0x7fffed, 23); |
|
267 |
addChar(tmpRoot, 181, 0x3fffe1, 22); |
|
268 |
addChar(tmpRoot, 182, 0x7fffee, 23); |
|
269 |
addChar(tmpRoot, 183, 0x7fffef, 23); |
|
270 |
addChar(tmpRoot, 184, 0xfffea, 20); |
|
271 |
addChar(tmpRoot, 185, 0x3fffe2, 22); |
|
272 |
addChar(tmpRoot, 186, 0x3fffe3, 22); |
|
273 |
addChar(tmpRoot, 187, 0x3fffe4, 22); |
|
274 |
addChar(tmpRoot, 188, 0x7ffff0, 23); |
|
275 |
addChar(tmpRoot, 189, 0x3fffe5, 22); |
|
276 |
addChar(tmpRoot, 190, 0x3fffe6, 22); |
|
277 |
addChar(tmpRoot, 191, 0x7ffff1, 23); |
|
278 |
addChar(tmpRoot, 192, 0x3ffffe0, 26); |
|
279 |
addChar(tmpRoot, 193, 0x3ffffe1, 26); |
|
280 |
addChar(tmpRoot, 194, 0xfffeb, 20); |
|
281 |
addChar(tmpRoot, 195, 0x7fff1, 19); |
|
282 |
addChar(tmpRoot, 196, 0x3fffe7, 22); |
|
283 |
addChar(tmpRoot, 197, 0x7ffff2, 23); |
|
284 |
addChar(tmpRoot, 198, 0x3fffe8, 22); |
|
285 |
addChar(tmpRoot, 199, 0x1ffffec, 25); |
|
286 |
addChar(tmpRoot, 200, 0x3ffffe2, 26); |
|
287 |
addChar(tmpRoot, 201, 0x3ffffe3, 26); |
|
288 |
addChar(tmpRoot, 202, 0x3ffffe4, 26); |
|
289 |
addChar(tmpRoot, 203, 0x7ffffde, 27); |
|
290 |
addChar(tmpRoot, 204, 0x7ffffdf, 27); |
|
291 |
addChar(tmpRoot, 205, 0x3ffffe5, 26); |
|
292 |
addChar(tmpRoot, 206, 0xfffff1, 24); |
|
293 |
addChar(tmpRoot, 207, 0x1ffffed, 25); |
|
294 |
addChar(tmpRoot, 208, 0x7fff2, 19); |
|
295 |
addChar(tmpRoot, 209, 0x1fffe3, 21); |
|
296 |
addChar(tmpRoot, 210, 0x3ffffe6, 26); |
|
297 |
addChar(tmpRoot, 211, 0x7ffffe0, 27); |
|
298 |
addChar(tmpRoot, 212, 0x7ffffe1, 27); |
|
299 |
addChar(tmpRoot, 213, 0x3ffffe7, 26); |
|
300 |
addChar(tmpRoot, 214, 0x7ffffe2, 27); |
|
301 |
addChar(tmpRoot, 215, 0xfffff2, 24); |
|
302 |
addChar(tmpRoot, 216, 0x1fffe4, 21); |
|
303 |
addChar(tmpRoot, 217, 0x1fffe5, 21); |
|
304 |
addChar(tmpRoot, 218, 0x3ffffe8, 26); |
|
305 |
addChar(tmpRoot, 219, 0x3ffffe9, 26); |
|
306 |
addChar(tmpRoot, 220, 0xffffffd, 28); |
|
307 |
addChar(tmpRoot, 221, 0x7ffffe3, 27); |
|
308 |
addChar(tmpRoot, 222, 0x7ffffe4, 27); |
|
309 |
addChar(tmpRoot, 223, 0x7ffffe5, 27); |
|
310 |
addChar(tmpRoot, 224, 0xfffec, 20); |
|
311 |
addChar(tmpRoot, 225, 0xfffff3, 24); |
|
312 |
addChar(tmpRoot, 226, 0xfffed, 20); |
|
313 |
addChar(tmpRoot, 227, 0x1fffe6, 21); |
|
314 |
addChar(tmpRoot, 228, 0x3fffe9, 22); |
|
315 |
addChar(tmpRoot, 229, 0x1fffe7, 21); |
|
316 |
addChar(tmpRoot, 230, 0x1fffe8, 21); |
|
317 |
addChar(tmpRoot, 231, 0x7ffff3, 23); |
|
318 |
addChar(tmpRoot, 232, 0x3fffea, 22); |
|
319 |
addChar(tmpRoot, 233, 0x3fffeb, 22); |
|
320 |
addChar(tmpRoot, 234, 0x1ffffee, 25); |
|
321 |
addChar(tmpRoot, 235, 0x1ffffef, 25); |
|
322 |
addChar(tmpRoot, 236, 0xfffff4, 24); |
|
323 |
addChar(tmpRoot, 237, 0xfffff5, 24); |
|
324 |
addChar(tmpRoot, 238, 0x3ffffea, 26); |
|
325 |
addChar(tmpRoot, 239, 0x7ffff4, 23); |
|
326 |
addChar(tmpRoot, 240, 0x3ffffeb, 26); |
|
327 |
addChar(tmpRoot, 241, 0x7ffffe6, 27); |
|
328 |
addChar(tmpRoot, 242, 0x3ffffec, 26); |
|
329 |
addChar(tmpRoot, 243, 0x3ffffed, 26); |
|
330 |
addChar(tmpRoot, 244, 0x7ffffe7, 27); |
|
331 |
addChar(tmpRoot, 245, 0x7ffffe8, 27); |
|
332 |
addChar(tmpRoot, 246, 0x7ffffe9, 27); |
|
333 |
addChar(tmpRoot, 247, 0x7ffffea, 27); |
|
334 |
addChar(tmpRoot, 248, 0x7ffffeb, 27); |
|
335 |
addChar(tmpRoot, 249, 0xffffffe, 28); |
|
336 |
addChar(tmpRoot, 250, 0x7ffffec, 27); |
|
337 |
addChar(tmpRoot, 251, 0x7ffffed, 27); |
|
338 |
addChar(tmpRoot, 252, 0x7ffffee, 27); |
|
339 |
addChar(tmpRoot, 253, 0x7ffffef, 27); |
|
340 |
addChar(tmpRoot, 254, 0x7fffff0, 27); |
|
341 |
addChar(tmpRoot, 255, 0x3ffffee, 26); |
|
342 |
addEOS (tmpRoot, 256, EOS_LSB, EOS_LENGTH); |
|
343 |
||
344 |
// The difference in performance can always be checked by not using |
|
345 |
// the immutable trie: |
|
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346 |
// return tmpRoot; |
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347 |
return ImmutableNode.copyOf(tmpRoot); |
49944 | 348 |
} |
349 |
||
350 |
private QuickHuffman() { } |
|
351 |
||
352 |
private static void addChar(Node root, int symbol, int code, int bitLength) |
|
353 |
{ |
|
354 |
addLeaf(root, (char) symbol, code, bitLength, false); |
|
355 |
long value = ((long) code) << (64 - bitLength); // re-align MSB <- LSB |
|
356 |
codes[symbol] = value | bitLength; |
|
357 |
} |
|
358 |
||
359 |
private static void addEOS(Node root, int symbol, int code, int bitLength) |
|
360 |
{ |
|
361 |
addLeaf(root, (char) symbol, code, bitLength, true); |
|
362 |
} |
|
363 |
||
364 |
private static void addLeaf(Node root, |
|
365 |
char symbol, |
|
366 |
int code, |
|
367 |
int bitLength, |
|
368 |
boolean isEOS) |
|
369 |
{ |
|
370 |
assert 0 < bitLength && bitLength <= 32 : bitLength; |
|
371 |
Node curr = root; |
|
372 |
int nBytes = bytesForBits(bitLength); |
|
373 |
// The number of bits the code needs to be shifted to the left in order |
|
374 |
// to align with the byte #nBytes boundary: |
|
375 |
int align = (nBytes << 3) - bitLength; |
|
376 |
code <<= align; |
|
377 |
// descend the trie until the last element |
|
378 |
int l = 0; |
|
379 |
for (int i = 0, probe = 0xff << ((nBytes - 1) << 3); |
|
380 |
i < nBytes - 1; |
|
381 |
i++, probe >>>= 8) |
|
382 |
{ |
|
383 |
curr.setEOSPath(curr.isEOSPath() | isEOS); |
|
384 |
int idx = (code & probe) >>> ((nBytes - 1 - i) << 3); |
|
385 |
curr = curr.getOrCreateChild(idx); |
|
386 |
curr.setLength(8); |
|
387 |
l += 8; |
|
388 |
} |
|
389 |
// Assign the same char to all byte variants. For example, if the code |
|
390 |
// and its length are 00011b and 5 respectively (letter 'a') then, in |
|
391 |
// order to be able to match any byte starting with 00011b prefix, |
|
392 |
// the following nodes need to be created: |
|
393 |
// |
|
394 |
// 00011000b, 00011001b, 00011010b, 00011011b, 00011100b, 00011101b, |
|
395 |
// 00011110b and 00011111b |
|
396 |
int idx = code & 0xff; |
|
397 |
curr.setEOSPath(curr.isEOSPath() | isEOS); |
|
398 |
for (int i = 0; i < (1 << align); i++) { |
|
399 |
Node child = curr.getOrCreateChild(idx | i); |
|
400 |
child.setSymbol(symbol); |
|
401 |
child.setEOSPath(child.isEOSPath() | isEOS); |
|
402 |
child.setLength(bitLength - l); |
|
403 |
} |
|
404 |
} |
|
405 |
||
406 |
/* |
|
407 |
* A node in the Huffman trie. |
|
408 |
*/ |
|
409 |
interface Node { |
|
410 |
||
411 |
boolean isEOSPath(); |
|
412 |
||
413 |
void setEOSPath(boolean value); |
|
414 |
||
415 |
boolean isLeaf(); |
|
416 |
||
417 |
Node getChild(int index); |
|
418 |
||
419 |
Node getOrCreateChild(int index); |
|
420 |
||
421 |
Node[] getChildren(); |
|
422 |
||
423 |
char getSymbol(); |
|
424 |
||
425 |
void setSymbol(char symbol); |
|
426 |
||
427 |
int getLength(); |
|
428 |
||
429 |
void setLength(int value); |
|
430 |
} |
|
431 |
||
432 |
/* |
|
433 |
* Mutable nodes used for initial construction of the Huffman trie. |
|
434 |
* (These nodes are perfectly ok to be used after that.) |
|
435 |
*/ |
|
436 |
static final class TemporaryNode implements Node { |
|
437 |
||
438 |
private char symbol; |
|
439 |
private boolean eosPath; |
|
440 |
private TemporaryNode[] children; |
|
441 |
private int length; |
|
442 |
||
443 |
@Override |
|
444 |
public TemporaryNode getOrCreateChild(int index) { |
|
445 |
ensureChildrenExist(); |
|
446 |
if (children[index] == null) { |
|
447 |
children[index] = new TemporaryNode(); |
|
448 |
} |
|
449 |
return children[index]; |
|
450 |
} |
|
451 |
||
452 |
private void ensureChildrenExist() { |
|
453 |
if (children == null) { |
|
454 |
children = new TemporaryNode[256]; |
|
455 |
} |
|
456 |
} |
|
457 |
||
458 |
@Override |
|
459 |
public boolean isLeaf() { |
|
460 |
return children == null; |
|
461 |
} |
|
462 |
||
463 |
@Override |
|
464 |
public boolean isEOSPath() { |
|
465 |
return eosPath; |
|
466 |
} |
|
467 |
||
468 |
@Override |
|
469 |
public void setEOSPath(boolean value) { |
|
470 |
eosPath = value; |
|
471 |
} |
|
472 |
||
473 |
@Override |
|
474 |
public TemporaryNode getChild(int index) { |
|
475 |
ensureChildrenExist(); |
|
476 |
return children[index]; |
|
477 |
} |
|
478 |
||
479 |
@Override |
|
480 |
public Node[] getChildren() { |
|
481 |
if (children == null) { |
|
482 |
return new Node[0]; |
|
483 |
} |
|
484 |
return children; |
|
485 |
} |
|
486 |
||
487 |
@Override |
|
488 |
public char getSymbol() { |
|
489 |
return symbol; |
|
490 |
} |
|
491 |
||
492 |
@Override |
|
493 |
public int getLength() { |
|
494 |
return length; |
|
495 |
} |
|
496 |
||
497 |
@Override |
|
498 |
public void setSymbol(char value) { |
|
499 |
this.symbol = value; |
|
500 |
} |
|
501 |
||
502 |
@Override |
|
503 |
public void setLength(int value) { |
|
504 |
this.length = value; |
|
505 |
} |
|
506 |
} |
|
507 |
||
508 |
/* |
|
509 |
* Immutable node used to construct traversal-only Huffman trie. |
|
510 |
* |
|
511 |
* Once the trie has been built, the support of modifications is no longer |
|
512 |
* required. An immutable trie should be used. Not only it will help to |
|
513 |
* catch possible bugs, but hopefully speedup the traversal operations. |
|
514 |
*/ |
|
515 |
static final class ImmutableNode implements Node { |
|
516 |
||
517 |
private final char symbol; |
|
518 |
private final boolean eosPath; |
|
519 |
private final int length; |
|
520 |
private final List<ImmutableNode> children; |
|
521 |
||
522 |
public static ImmutableNode copyOf(Node node) { |
|
523 |
if (node.isLeaf()) { |
|
524 |
return new ImmutableNode(node.getSymbol(), node.isEOSPath(), |
|
525 |
node.getLength()); |
|
526 |
} |
|
527 |
Node[] children = node.getChildren(); |
|
528 |
ImmutableNode[] immutableChildren = new ImmutableNode[children.length]; |
|
529 |
for (int i = 0; i < children.length; i++) { |
|
530 |
immutableChildren[i] = copyOf(children[i]); |
|
531 |
} |
|
532 |
return new ImmutableNode(node.isEOSPath(), node.getLength(), |
|
533 |
immutableChildren); |
|
534 |
} |
|
535 |
||
536 |
/* Creates a leaf node */ |
|
537 |
private ImmutableNode(char symbol, |
|
538 |
boolean eosPath, |
|
539 |
int length) { |
|
540 |
this.symbol = symbol; |
|
541 |
this.eosPath = eosPath; |
|
542 |
this.length = length; |
|
543 |
this.children = List.of(); |
|
544 |
} |
|
545 |
||
546 |
/* Creates a node with children */ |
|
547 |
private ImmutableNode(boolean eosPath, |
|
548 |
int length, |
|
549 |
ImmutableNode[] children) |
|
550 |
{ |
|
551 |
this.symbol = 0; |
|
552 |
this.eosPath = eosPath; |
|
553 |
this.length = length; |
|
554 |
if (children.length == 0) { |
|
555 |
throw new IllegalArgumentException(); |
|
556 |
} |
|
557 |
// A list produced by List.of should not be slower than array for |
|
558 |
// accessing elements by index, and hopefully use additional |
|
559 |
// optimizations (e.g. jdk.internal.vm.annotation.Stable) |
|
560 |
this.children = List.of(children); |
|
561 |
} |
|
562 |
||
563 |
@Override |
|
564 |
public boolean isLeaf() { |
|
565 |
return children.isEmpty(); |
|
566 |
} |
|
567 |
||
568 |
@Override |
|
569 |
public boolean isEOSPath() { |
|
570 |
return eosPath; |
|
571 |
} |
|
572 |
||
573 |
@Override |
|
574 |
public void setEOSPath(boolean value) { |
|
575 |
throw new UnsupportedOperationException(); |
|
576 |
} |
|
577 |
||
578 |
@Override |
|
579 |
public ImmutableNode getChild(int index) { |
|
580 |
return children.get(index); |
|
581 |
} |
|
582 |
||
583 |
@Override |
|
584 |
public ImmutableNode getOrCreateChild(int index) { |
|
585 |
throw new UnsupportedOperationException(); |
|
586 |
} |
|
587 |
||
588 |
@Override |
|
589 |
public ImmutableNode[] getChildren() { |
|
590 |
// This method is not expected to be called on an immutable node. |
|
591 |
// If it is called, it requires some investigation. |
|
592 |
throw new UnsupportedOperationException(); |
|
593 |
} |
|
594 |
||
595 |
@Override |
|
596 |
public char getSymbol() { |
|
597 |
return symbol; |
|
598 |
} |
|
599 |
||
600 |
@Override |
|
601 |
public void setSymbol(char symbol) { |
|
602 |
throw new UnsupportedOperationException(); |
|
603 |
} |
|
604 |
||
605 |
@Override |
|
606 |
public int getLength() { |
|
607 |
return length; |
|
608 |
} |
|
609 |
||
610 |
@Override |
|
611 |
public void setLength(int value) { |
|
612 |
throw new UnsupportedOperationException(); |
|
613 |
} |
|
614 |
} |
|
615 |
||
616 |
static final class Reader implements Huffman.Reader { |
|
617 |
||
56623
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49944
diff
changeset
|
618 |
private final BufferUpdateConsumer UPDATER = |
1d020b5d73f1
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49944
diff
changeset
|
619 |
(buf, bufLen) -> { |
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parents:
49944
diff
changeset
|
620 |
buffer = buf; |
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49944
diff
changeset
|
621 |
bufferLen = bufLen; |
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changeset
|
622 |
}; |
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49944
diff
changeset
|
623 |
|
49944 | 624 |
private Node curr = root; // current position in the trie |
625 |
private long buffer; // bits left from the previous match (aligned to the left, or MSB) |
|
626 |
private int bufferLen; // number of bits in the buffer |
|
627 |
private int len; // length (in bits) of path to curr |
|
628 |
private boolean done; |
|
629 |
||
630 |
@Override |
|
631 |
public void read(ByteBuffer source, |
|
632 |
Appendable destination, |
|
633 |
boolean isLast) throws IOException |
|
634 |
{ |
|
635 |
while (!done) { |
|
636 |
int remaining = source.remaining(); |
|
56623
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49944
diff
changeset
|
637 |
int nBytes = HPACK.read(source, buffer, bufferLen, UPDATER); |
49944 | 638 |
// write as much as possible |
639 |
while (true) { |
|
640 |
if (bufferLen < 8) { |
|
641 |
if (nBytes < remaining) { // read again |
|
642 |
break; |
|
643 |
} else if (!isLast) { // exit the method to accept more input |
|
644 |
return; |
|
645 |
} else if (bufferLen > 0) { // no more data is expected, pad |
|
646 |
// (this padding may be done more than once) |
|
647 |
buffer |= ((0xff00000000000000L >>> bufferLen) |
|
648 |
& 0xff00000000000000L); |
|
649 |
// do not update bufferLen, since all those ones are |
|
650 |
// synthetic and are appended merely for the sake of |
|
651 |
// lookup |
|
652 |
} else { |
|
653 |
done = true; |
|
654 |
break; |
|
655 |
} |
|
656 |
} |
|
657 |
int idx = (int) (buffer >>> 56); |
|
658 |
Node node = curr.getChild(idx); |
|
659 |
if (node == null) { // TODO: TEST |
|
660 |
throw new IOException("Unexpected byte"); |
|
661 |
} |
|
662 |
if (node.isLeaf()) { |
|
663 |
if (node.getLength() > bufferLen) { // matched more than we actually could (because of padding) |
|
664 |
throw new IOException( |
|
665 |
"Not a EOS prefix padding or unexpected end of data"); |
|
666 |
} |
|
56623
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49944
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changeset
|
667 |
if (node.isEOSPath()) { |
49944 | 668 |
throw new IOException("Encountered EOS"); |
669 |
} |
|
670 |
destination.append(node.getSymbol()); |
|
671 |
curr = root; |
|
672 |
len = 0; |
|
673 |
} else { |
|
674 |
curr = node; |
|
675 |
// because of the padding, we can't match more bits than |
|
676 |
// there are currently in the buffer |
|
677 |
len += Math.min(bufferLen, node.getLength()); |
|
678 |
} |
|
679 |
buffer <<= node.getLength(); |
|
680 |
bufferLen -= node.getLength(); |
|
681 |
} |
|
682 |
if (done && (curr.isEOSPath() && len > 7)) { |
|
683 |
throw new IOException( |
|
684 |
"Padding is too long (len=" + len + ") " |
|
685 |
+ "or unexpected end of data"); |
|
686 |
} |
|
687 |
} |
|
688 |
} |
|
689 |
||
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|
690 |
@Override |
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49944
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|
691 |
public void reset() { |
1d020b5d73f1
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prappo
parents:
49944
diff
changeset
|
692 |
curr = root; |
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49944
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changeset
|
693 |
len = 0; |
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|
694 |
buffer = 0; |
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prappo
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49944
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|
695 |
bufferLen = 0; |
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49944
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changeset
|
696 |
done = false; |
49944 | 697 |
} |
698 |
} |
|
699 |
||
700 |
static final class Writer implements Huffman.Writer { |
|
701 |
||
56623
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changeset
|
702 |
private final BufferUpdateConsumer UPDATER = |
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diff
changeset
|
703 |
(buf, bufLen) -> { |
1d020b5d73f1
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49944
diff
changeset
|
704 |
buffer = buf; |
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49944
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changeset
|
705 |
bufferLen = bufLen; |
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parents:
49944
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changeset
|
706 |
}; |
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prappo
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49944
diff
changeset
|
707 |
|
49944 | 708 |
private CharSequence source; |
709 |
private boolean padded; |
|
710 |
private int pos; |
|
711 |
private int end; |
|
712 |
private long buffer; |
|
713 |
private int bufferLen; |
|
714 |
||
715 |
@Override |
|
716 |
public QuickHuffman.Writer from(CharSequence input, int start, int end) { |
|
717 |
Objects.checkFromToIndex(start, end, input.length()); |
|
718 |
this.pos = start; |
|
719 |
this.end = end; |
|
720 |
this.source = input; |
|
721 |
return this; |
|
722 |
} |
|
723 |
||
724 |
@Override |
|
725 |
public boolean write(ByteBuffer destination) { |
|
726 |
while (true) { |
|
56623
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
727 |
while (true) { // stuff codes into long |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
728 |
if (pos >= end) { |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
729 |
break; |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
730 |
} |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
731 |
char c = source.charAt(pos); |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
732 |
if (c > 255) { |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
733 |
throw new IllegalArgumentException("char=" + ((int) c)); |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
734 |
} |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
735 |
long len = codeLengthOf(c); |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
736 |
if (bufferLen + len <= 64) { |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
737 |
buffer |= (codeValueOf(c) >>> bufferLen); // append |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
738 |
bufferLen += len; |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
739 |
pos++; |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
740 |
} else { |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
741 |
break; |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
742 |
} |
49944 | 743 |
} |
744 |
if (bufferLen == 0) { |
|
745 |
return true; |
|
746 |
} |
|
56623
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
747 |
if (pos >= end && !padded) { // no more input chars are expected, pad |
49944 | 748 |
padded = true; |
56623
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
749 |
// A long shift to 64 will result in the same long, not |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
750 |
// necessarily 0L. In which case padding will be performed |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
751 |
// incorrectly. If bufferLen is equal to 64, the shift (and |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
752 |
// padding) in not performed. |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
753 |
// (see https://docs.oracle.com/javase/specs/jls/se10/html/jls-15.html#jls-15.19) |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
754 |
if (bufferLen != 64) { |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
755 |
buffer |= (EOS_MSB >>> bufferLen); |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
756 |
bufferLen = bytesForBits(bufferLen) << 3; |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
757 |
} |
49944 | 758 |
} |
56623
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
759 |
int nBytes = HPACK.write(buffer, bufferLen, UPDATER, destination); |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
760 |
if (nBytes == 0) { |
1d020b5d73f1
http-client-branch: review comment - HPACK misc. improvements
prappo
parents:
49944
diff
changeset
|
761 |
return false; |
49944 | 762 |
} |
763 |
} |
|
764 |
} |
|
765 |
||
766 |
@Override |
|
767 |
public QuickHuffman.Writer reset() { |
|
768 |
source = null; |
|
769 |
buffer = 0; |
|
770 |
bufferLen = 0; |
|
771 |
end = 0; |
|
772 |
pos = 0; |
|
773 |
padded = false; |
|
774 |
return this; |
|
775 |
} |
|
776 |
||
777 |
@Override |
|
778 |
public int lengthOf(CharSequence value, int start, int end) { |
|
779 |
int len = 0; |
|
780 |
for (int i = start; i < end; i++) { |
|
781 |
char c = value.charAt(i); |
|
782 |
len += codeLengthOf(c); |
|
783 |
} |
|
784 |
return bytesForBits(len); |
|
785 |
} |
|
786 |
} |
|
787 |
} |