1 /*
2 * Copyright (c) 2005, 2020, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 /*
26 *******************************************************************************
27 *
28 * Copyright (C) 2004-2014, International Business Machines
29 * Corporation and others. All Rights Reserved.
30 *
31 *******************************************************************************
32 * file name: UBiDiProps.java
33 * encoding: US-ASCII
34 * tab size: 8 (not used)
35 * indentation:4
36 *
37 * created on: 2005jan16
38 * created by: Markus W. Scherer
39 *
40 * Low-level Unicode bidi/shaping properties access.
41 * Java port of ubidi_props.h/.c.
42 */
43
44 package jdk.internal.icu.impl;
45
46 import jdk.internal.icu.lang.UCharacter;
47 import jdk.internal.icu.util.VersionInfo;
48
49 import java.io.IOException;
50 import java.nio.ByteBuffer;
51 import java.util.MissingResourceException;
52
53 public final class UBiDiProps {
54 // constructors etc. --------------------------------------------------- ***
55
56 // port of ubidi_openProps()
57 private UBiDiProps() throws IOException{
58 ByteBuffer bytes=ICUBinary.getRequiredData(DATA_FILE_NAME);
59 readData(bytes);
60 }
61
62 private void readData(ByteBuffer bytes) throws IOException {
63 // read the header
64 ICUBinary.readHeader(bytes, FMT, new IsAcceptable());
65
66 // read indexes[]
67 int i, count;
68 count=bytes.getInt();
69 if(count<IX_TOP) {
70 throw new IOException("indexes[0] too small in "+DATA_FILE_NAME);
71 }
72 indexes=new int[count];
73
74 indexes[0]=count;
75 for(i=1; i<count; ++i) {
76 indexes[i]=bytes.getInt();
77 }
78
79 // read the trie
80 trie=Trie2_16.createFromSerialized(bytes);
81 int expectedTrieLength=indexes[IX_TRIE_SIZE];
82 int trieLength=trie.getSerializedLength();
83 if(trieLength>expectedTrieLength) {
84 throw new IOException(DATA_FILE_NAME+": not enough bytes for the trie");
85 }
86 // skip padding after trie bytes
87 ICUBinary.skipBytes(bytes, expectedTrieLength-trieLength);
88
89 // read mirrors[]
90 count=indexes[IX_MIRROR_LENGTH];
91 if(count>0) {
92 mirrors=new int[count];
93 for(i=0; i<count; ++i) {
94 mirrors[i]=bytes.getInt();
95 }
96 }
97
98 // read jgArray[]
99 count=indexes[IX_JG_LIMIT]-indexes[IX_JG_START];
100 jgArray=new byte[count];
101 for(i=0; i<count; ++i) {
102 jgArray[i]=bytes.get();
103 }
104
105 // read jgArray2[]
106 count=indexes[IX_JG_LIMIT2]-indexes[IX_JG_START2];
107 jgArray2=new byte[count];
108 for(i=0; i<count; ++i) {
109 jgArray2[i]=bytes.get();
110 }
111 }
112
113 // implement ICUBinary.Authenticate
114 private static final class IsAcceptable implements ICUBinary.Authenticate {
115 public boolean isDataVersionAcceptable(byte version[]) {
116 return version[0]==2;
117 }
118 }
119
120 // property access functions ------------------------------------------- ***
121
122 public final int getClass(int c) {
123 return getClassFromProps(trie.get(c));
124 }
125
126 private final int getMirror(int c, int props) {
127 int delta=getMirrorDeltaFromProps(props);
128 if(delta!=ESC_MIRROR_DELTA) {
129 return c+delta;
130 } else {
131 /* look for mirror code point in the mirrors[] table */
132 int m;
133 int i, length;
134 int c2;
135
136 length=indexes[IX_MIRROR_LENGTH];
137
138 /* linear search */
139 for(i=0; i<length; ++i) {
140 m=mirrors[i];
141 c2=getMirrorCodePoint(m);
142 if(c==c2) {
143 /* found c, return its mirror code point using the index in m */
144 return getMirrorCodePoint(mirrors[getMirrorIndex(m)]);
145 } else if(c<c2) {
146 break;
147 }
148 }
149
150 /* c not found, return it itself */
151 return c;
152 }
153 }
154
155 public final int getMirror(int c) {
156 int props=trie.get(c);
157 return getMirror(c, props);
158 }
159
160 public final int getJoiningType(int c) {
161 return (trie.get(c)&JT_MASK)>>JT_SHIFT;
162 }
163
164 public final int getJoiningGroup(int c) {
165 int start, limit;
166
167 start=indexes[IX_JG_START];
168 limit=indexes[IX_JG_LIMIT];
169 if(start<=c && c<limit) {
170 return (int)jgArray[c-start]&0xff;
171 }
172 start=indexes[IX_JG_START2];
173 limit=indexes[IX_JG_LIMIT2];
174 if(start<=c && c<limit) {
175 return (int)jgArray2[c-start]&0xff;
176 }
177 return UCharacter.JoiningGroup.NO_JOINING_GROUP;
178 }
179
180 public final int getPairedBracketType(int c) {
181 return (trie.get(c)&BPT_MASK)>>BPT_SHIFT;
182 }
183
184 public final int getPairedBracket(int c) {
185 int props=trie.get(c);
186 if((props&BPT_MASK)==0) {
187 return c;
188 } else {
189 return getMirror(c, props);
190 }
191 }
192
193 // data members -------------------------------------------------------- ***
194 private int indexes[];
195 private int mirrors[];
196 private byte jgArray[];
197 private byte jgArray2[];
198
199 private Trie2_16 trie;
200
201 // data format constants ----------------------------------------------- ***
202 @SuppressWarnings("deprecation")
203 private static final String DATA_FILE_NAME =
204 "/jdk/internal/icu/impl/data/icudt" +
205 VersionInfo.ICU_DATA_VERSION_PATH +
206 "/ubidi.icu";
207
208 /* format "BiDi" */
209 private static final int FMT=0x42694469;
210
211 /* indexes into indexes[] */
212 private static final int IX_TRIE_SIZE=2;
213 private static final int IX_MIRROR_LENGTH=3;
214
215 private static final int IX_JG_START=4;
216 private static final int IX_JG_LIMIT=5;
217 private static final int IX_JG_START2=6; /* new in format version 2.2, ICU 54 */
218 private static final int IX_JG_LIMIT2=7;
219
220 private static final int IX_TOP=16;
221
222 // definitions for 16-bit bidi/shaping properties word ----------------- ***
223
224 /* CLASS_SHIFT=0, */ /* bidi class: 5 bits (4..0) */
225 private static final int JT_SHIFT=5; /* joining type: 3 bits (7..5) */
226
227 private static final int BPT_SHIFT=8; /* Bidi_Paired_Bracket_Type(bpt): 2 bits (9..8) */
228
229 private static final int MIRROR_DELTA_SHIFT=13; /* bidi mirroring delta: 3 bits (15..13) */
230
231 private static final int CLASS_MASK= 0x0000001f;
232 private static final int JT_MASK= 0x000000e0;
233 private static final int BPT_MASK= 0x00000300;
234
235 private static final int getClassFromProps(int props) {
236 return props&CLASS_MASK;
237 }
238 private static final boolean getFlagFromProps(int props, int shift) {
239 return ((props>>shift)&1)!=0;
240 }
241 private static final int getMirrorDeltaFromProps(int props) {
242 return (short)props>>MIRROR_DELTA_SHIFT;
243 }
244
245 private static final int ESC_MIRROR_DELTA=-4;
246
247 // definitions for 32-bit mirror table entry --------------------------- ***
248
249 /* the source Unicode code point takes 21 bits (20..0) */
250 private static final int MIRROR_INDEX_SHIFT=21;
251
252 private static final int getMirrorCodePoint(int m) {
253 return m&0x1fffff;
254 }
255 private static final int getMirrorIndex(int m) {
256 return m>>>MIRROR_INDEX_SHIFT;
257 }
258
259
260 /*
261 * public singleton instance
262 */
263 public static final UBiDiProps INSTANCE;
264
265 // This static initializer block must be placed after
266 // other static member initialization
267 static {
268 try {
269 INSTANCE = new UBiDiProps();
270 } catch (IOException e) {
271 throw new MissingResourceException(e.getMessage(),DATA_FILE_NAME,"");
272 }
273 }
274 }