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- /*
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
- /* $Id$ */
-
- package org.apache.fop.fonts;
-
- import java.util.Arrays;
-
- import org.apache.xmlgraphics.fonts.Glyphs;
-
- import org.apache.fop.util.CharUtilities;
-
- /**
- * Abstract base class for code point mapping classes (1-byte character encodings).
- */
- public class AbstractCodePointMapping implements SingleByteEncoding {
-
- private final String name;
- private char[] latin1Map;
- private char[] characters;
- private char[] codepoints;
- private char[] unicodeMap; //code point to Unicode char
- private String[] charNameMap; //all character names in the encoding
-
- /**
- * Main constructor.
- * @param name the name of the encoding
- * @param table the table ([code point, unicode scalar value]+) with the mapping
- */
- public AbstractCodePointMapping(String name, int[] table) {
- this(name, table, null);
- }
-
- /**
- * Extended constructor.
- * @param name the name of the encoding
- * @param table the table ([code point, unicode scalar value]+) with the mapping
- * @param charNameMap all character names in the encoding (a value of null will be converted
- * to ".notdef")
- */
- public AbstractCodePointMapping(String name, int[] table, String[] charNameMap) {
- this.name = name;
- buildFromTable(table);
- if (charNameMap != null) {
- this.charNameMap = new String[256];
- for (int i = 0; i < 256; i++) {
- String charName = charNameMap[i];
- if (charName == null) {
- this.charNameMap[i] = Glyphs.NOTDEF;
- } else {
- this.charNameMap[i] = charName;
- }
- }
- }
- }
-
- /**
- * Builds the internal lookup structures based on a given table.
- * @param table the table ([code point, unicode scalar value]+) with the mapping
- */
- protected void buildFromTable(int[] table) {
- int nonLatin1 = 0;
- latin1Map = new char[256];
- unicodeMap = new char[256];
- Arrays.fill(unicodeMap, CharUtilities.NOT_A_CHARACTER);
- for (int i = 0; i < table.length; i += 2) {
- char unicode = (char)table[i + 1];
- if (unicode < 256) {
- if (latin1Map[unicode] == 0) {
- latin1Map[unicode] = (char) table[i];
- }
- } else {
- ++nonLatin1;
- }
- if (unicodeMap[table[i]] == CharUtilities.NOT_A_CHARACTER) {
- unicodeMap[table[i]] = unicode;
- }
- }
- characters = new char[nonLatin1];
- codepoints = new char[nonLatin1];
- int top = 0;
- for (int i = 0; i < table.length; i += 2) {
- char c = (char) table[i + 1];
- if (c >= 256) {
- ++top;
- for (int j = top - 1; j >= 0; --j) {
- if (j > 0 && characters[j - 1] >= c) {
- characters[j] = characters[j - 1];
- codepoints[j] = codepoints[j - 1];
- } else {
- characters[j] = c;
- codepoints[j] = (char) table[i];
- break;
- }
- }
- }
- }
- }
-
- /** {@inheritDoc} */
- public String getName() {
- return this.name;
- }
-
- /** {@inheritDoc} */
- public final char mapChar(char c) {
- if (c < 256) {
- char latin1 = latin1Map[c];
- if (latin1 > 0) {
- return latin1;
- }
- }
- int bot = 0;
- int top = characters.length - 1;
- while (top >= bot) {
- assert bot < 65536;
- assert top < 65536;
- int mid = (bot + top) >>> 1;
- char mc = characters[mid];
-
- if (c == mc) {
- return codepoints[mid];
- } else if (c < mc) {
- top = mid - 1;
- } else {
- bot = mid + 1;
- }
- }
- return NOT_FOUND_CODE_POINT;
- }
-
- /**
- * Returns the main Unicode value that is associated with the given code point in the encoding.
- * Note that multiple Unicode values can theoretically be mapped to one code point in the
- * encoding.
- * @param idx the code point in the encoding
- * @return the Unicode value (or \uFFFF (NOT A CHARACTER) if no Unicode value is at that point)
- */
- public final char getUnicodeForIndex(int idx) {
- return this.unicodeMap[idx];
- }
-
- /** {@inheritDoc} */
- public final char[] getUnicodeCharMap() {
- char[] copy = new char[this.unicodeMap.length];
- System.arraycopy(this.unicodeMap, 0, copy, 0, this.unicodeMap.length);
- return copy;
- }
-
- /**
- * Returns the index of a character/glyph with the given name. Note that this
- * method is relatively slow and should only be used for fallback operations.
- * @param charName the character name
- * @return the index of the character in the encoding or -1 if it doesn't exist
- */
- public short getCodePointForGlyph(String charName) {
- String[] names = this.charNameMap;
- if (names == null) {
- names = getCharNameMap();
- }
- for (short i = 0, c = (short)names.length; i < c; i++) {
- if (names[i].equals(charName)) {
- return i;
- }
- }
- return -1;
- }
-
- public String getNameFromCodePoint(int idx) {
- return getCharNameMap()[idx];
- }
-
- /** {@inheritDoc} */
- public String[] getCharNameMap() {
- if (this.charNameMap != null) {
- String[] copy = new String[this.charNameMap.length];
- System.arraycopy(this.charNameMap, 0, copy, 0, this.charNameMap.length);
- return copy;
- } else {
- //Note: this is suboptimal but will probably never be used.
- String[] derived = new String[256];
- Arrays.fill(derived, Glyphs.NOTDEF);
- for (int i = 0; i < 256; i++) {
- char c = getUnicodeForIndex(i);
- if (c != CharUtilities.NOT_A_CHARACTER) {
- String charName = Glyphs.charToGlyphName(c);
- if (charName.length() > 0) {
- derived[i] = charName;
- }
- }
- }
- return derived;
- }
- }
-
- /** {@inheritDoc} */
- @Override
- public String toString() {
- return getName();
- }
- }
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