| /* |
| * Copyright (c) 2002, 2006, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| */ |
| |
| package sun.font; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.CharBuffer; |
| import java.nio.charset.Charset; |
| import java.nio.charset.CharsetEncoder; |
| import java.nio.charset.CoderResult; |
| import sun.nio.cs.Surrogate; |
| |
| public abstract class DoubleByteEncoder |
| extends CharsetEncoder |
| { |
| |
| private short index1[]; |
| private String index2[]; |
| |
| private final Surrogate.Parser sgp = new Surrogate.Parser(); |
| |
| protected DoubleByteEncoder(Charset cs, |
| short[] index1, String[] index2) |
| { |
| super(cs, 2.0f, 2.0f); |
| this.index1 = index1; |
| this.index2 = index2; |
| } |
| |
| protected DoubleByteEncoder(Charset cs, |
| short[] index1, String[] index2, |
| float avg, float max) |
| { |
| super(cs, avg, max); |
| this.index1 = index1; |
| this.index2 = index2; |
| } |
| |
| protected DoubleByteEncoder(Charset cs, |
| short[] index1, String[] index2, byte[] repl) |
| { |
| super(cs, 2.0f, 2.0f, repl); |
| this.index1 = index1; |
| this.index2 = index2; |
| } |
| |
| |
| protected DoubleByteEncoder(Charset cs, |
| short[] index1, String[] index2, |
| byte[] repl, float avg, float max) |
| { |
| super(cs, avg, max,repl); |
| this.index1 = index1; |
| this.index2 = index2; |
| } |
| |
| public boolean canEncode(char c) { |
| return (encodeSingle(c) != -1 || |
| encodeDouble(c) != 0); |
| } |
| |
| private CoderResult encodeArrayLoop(CharBuffer src, ByteBuffer dst) { |
| char[] sa = src.array(); |
| int sp = src.arrayOffset() + src.position(); |
| int sl = src.arrayOffset() + src.limit(); |
| byte[] da = dst.array(); |
| int dp = dst.arrayOffset() + dst.position(); |
| int dl = dst.arrayOffset() + dst.limit(); |
| |
| try { |
| while (sp < sl) { |
| char c = sa[sp]; |
| if (Character.isSurrogate(c)) { |
| if (sgp.parse(c, sa, sp, sl) < 0) |
| return sgp.error(); |
| if (sl - sp < 2) |
| return CoderResult.UNDERFLOW; |
| char c2 = sa[sp + 1]; |
| |
| byte[] outputBytes = new byte[2]; |
| outputBytes = encodeSurrogate(c, c2); |
| |
| if (outputBytes == null) { |
| return sgp.unmappableResult(); |
| } |
| else { |
| if (dl - dp < 2) |
| return CoderResult.OVERFLOW; |
| da[dp++] = outputBytes[0]; |
| da[dp++] = outputBytes[1]; |
| sp += 2; |
| continue; |
| } |
| } |
| if (c >= '\uFFFE') |
| return CoderResult.unmappableForLength(1); |
| |
| int b = encodeSingle(c); |
| if (b != -1) { // Single Byte |
| if (dl - dp < 1) |
| return CoderResult.OVERFLOW; |
| da[dp++] = (byte)b; |
| sp++; |
| continue; |
| } |
| |
| int ncode = encodeDouble(c); |
| if (ncode != 0 && c != '\u0000' ) { |
| if (dl - dp < 2) |
| return CoderResult.OVERFLOW; |
| da[dp++] = (byte) ((ncode & 0xff00) >> 8); |
| da[dp++] = (byte) (ncode & 0xff); |
| sp++; |
| continue; |
| } |
| return CoderResult.unmappableForLength(1); |
| } |
| return CoderResult.UNDERFLOW; |
| } finally { |
| src.position(sp - src.arrayOffset()); |
| dst.position(dp - dst.arrayOffset()); |
| } |
| } |
| |
| private CoderResult encodeBufferLoop(CharBuffer src, ByteBuffer dst) { |
| int mark = src.position(); |
| |
| try { |
| while (src.hasRemaining()) { |
| char c = src.get(); |
| if (Character.isSurrogate(c)) { |
| int surr; |
| if ((surr = sgp.parse(c, src)) < 0) |
| return sgp.error(); |
| char c2 = Surrogate.low(surr); |
| byte[] outputBytes = new byte[2]; |
| outputBytes = encodeSurrogate(c, c2); |
| |
| if (outputBytes == null) { |
| return sgp.unmappableResult(); |
| } else { |
| if (dst.remaining() < 2) |
| return CoderResult.OVERFLOW; |
| mark += 2; |
| dst.put(outputBytes[0]); |
| dst.put(outputBytes[1]); |
| continue; |
| } |
| } |
| if (c >= '\uFFFE') |
| return CoderResult.unmappableForLength(1); |
| int b = encodeSingle(c); |
| |
| if (b != -1) { // Single-byte character |
| if (dst.remaining() < 1) |
| return CoderResult.OVERFLOW; |
| mark++; |
| dst.put((byte)b); |
| continue; |
| } |
| // Double Byte character |
| |
| int ncode = encodeDouble(c); |
| if (ncode != 0 && c != '\u0000') { |
| if (dst.remaining() < 2) |
| return CoderResult.OVERFLOW; |
| mark++; |
| dst.put((byte) ((ncode & 0xff00) >> 8)); |
| dst.put((byte) ncode); |
| continue; |
| } |
| return CoderResult.unmappableForLength(1); |
| } |
| |
| return CoderResult.UNDERFLOW; |
| } finally { |
| src.position(mark); |
| } |
| } |
| |
| protected CoderResult encodeLoop(CharBuffer src, ByteBuffer dst) { |
| if (true && src.hasArray() && dst.hasArray()) |
| return encodeArrayLoop(src, dst); |
| else |
| return encodeBufferLoop(src, dst); |
| } |
| |
| /* |
| * Can be changed by subclass |
| */ |
| protected int encodeDouble(char ch) { |
| int offset = index1[((ch & 0xff00) >> 8 )] << 8; |
| return index2[offset >> 12].charAt((offset & 0xfff) + (ch & 0xff)); |
| } |
| |
| /* |
| * Can be changed by subclass |
| */ |
| protected int encodeSingle(char inputChar) { |
| if (inputChar < 0x80) |
| return (byte)inputChar; |
| else |
| return -1; |
| } |
| |
| /** |
| * Protected method which should be overridden by concrete DBCS |
| * CharsetEncoder classes which included supplementary characters |
| * within their mapping coverage. |
| * null return value indicates surrogate values could not be |
| * handled or encoded. |
| */ |
| protected byte[] encodeSurrogate(char highSurrogate, char lowSurrogate) { |
| return null; |
| } |
| } |