| /* |
| * Copyright (c) 2000, 2017, 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.nio.cs; |
| |
| import java.nio.ByteBuffer; |
| import java.nio.CharBuffer; |
| import java.nio.charset.Charset; |
| import java.nio.charset.CharsetDecoder; |
| import java.nio.charset.CharsetEncoder; |
| import java.nio.charset.CoderResult; |
| |
| public class US_ASCII |
| extends Charset |
| implements HistoricallyNamedCharset |
| { |
| public static final US_ASCII INSTANCE = new US_ASCII(); |
| |
| public US_ASCII() { |
| super("US-ASCII", StandardCharsets.aliases_US_ASCII()); |
| } |
| |
| public String historicalName() { |
| return "ASCII"; |
| } |
| |
| public boolean contains(Charset cs) { |
| return (cs instanceof US_ASCII); |
| } |
| |
| public CharsetDecoder newDecoder() { |
| return new Decoder(this); |
| } |
| |
| public CharsetEncoder newEncoder() { |
| return new Encoder(this); |
| } |
| |
| private static class Decoder extends CharsetDecoder |
| implements ArrayDecoder { |
| |
| private Decoder(Charset cs) { |
| super(cs, 1.0f, 1.0f); |
| } |
| |
| private CoderResult decodeArrayLoop(ByteBuffer src, |
| CharBuffer dst) |
| { |
| byte[] sa = src.array(); |
| int sp = src.arrayOffset() + src.position(); |
| int sl = src.arrayOffset() + src.limit(); |
| assert (sp <= sl); |
| sp = (sp <= sl ? sp : sl); |
| char[] da = dst.array(); |
| int dp = dst.arrayOffset() + dst.position(); |
| int dl = dst.arrayOffset() + dst.limit(); |
| assert (dp <= dl); |
| dp = (dp <= dl ? dp : dl); |
| |
| try { |
| while (sp < sl) { |
| byte b = sa[sp]; |
| if (b >= 0) { |
| if (dp >= dl) |
| return CoderResult.OVERFLOW; |
| da[dp++] = (char)b; |
| sp++; |
| continue; |
| } |
| return CoderResult.malformedForLength(1); |
| } |
| return CoderResult.UNDERFLOW; |
| } finally { |
| src.position(sp - src.arrayOffset()); |
| dst.position(dp - dst.arrayOffset()); |
| } |
| } |
| |
| private CoderResult decodeBufferLoop(ByteBuffer src, |
| CharBuffer dst) |
| { |
| int mark = src.position(); |
| try { |
| while (src.hasRemaining()) { |
| byte b = src.get(); |
| if (b >= 0) { |
| if (!dst.hasRemaining()) |
| return CoderResult.OVERFLOW; |
| dst.put((char)b); |
| mark++; |
| continue; |
| } |
| return CoderResult.malformedForLength(1); |
| } |
| return CoderResult.UNDERFLOW; |
| } finally { |
| src.position(mark); |
| } |
| } |
| |
| protected CoderResult decodeLoop(ByteBuffer src, |
| CharBuffer dst) |
| { |
| if (src.hasArray() && dst.hasArray()) |
| return decodeArrayLoop(src, dst); |
| else |
| return decodeBufferLoop(src, dst); |
| } |
| |
| private char repl = '\uFFFD'; |
| protected void implReplaceWith(String newReplacement) { |
| repl = newReplacement.charAt(0); |
| } |
| |
| public int decode(byte[] src, int sp, int len, char[] dst) { |
| int dp = 0; |
| len = Math.min(len, dst.length); |
| while (dp < len) { |
| byte b = src[sp++]; |
| if (b >= 0) |
| dst[dp++] = (char)b; |
| else |
| dst[dp++] = repl; |
| } |
| return dp; |
| } |
| |
| public boolean isASCIICompatible() { |
| return true; |
| } |
| } |
| |
| private static class Encoder extends CharsetEncoder |
| implements ArrayEncoder { |
| |
| private Encoder(Charset cs) { |
| super(cs, 1.0f, 1.0f); |
| } |
| |
| public boolean canEncode(char c) { |
| return c < 0x80; |
| } |
| |
| public boolean isLegalReplacement(byte[] repl) { |
| return (repl.length == 1 && repl[0] >= 0) || |
| super.isLegalReplacement(repl); |
| } |
| |
| private final Surrogate.Parser sgp = new Surrogate.Parser(); |
| private CoderResult encodeArrayLoop(CharBuffer src, |
| ByteBuffer dst) |
| { |
| char[] sa = src.array(); |
| int sp = src.arrayOffset() + src.position(); |
| int sl = src.arrayOffset() + src.limit(); |
| assert (sp <= sl); |
| sp = (sp <= sl ? sp : sl); |
| byte[] da = dst.array(); |
| int dp = dst.arrayOffset() + dst.position(); |
| int dl = dst.arrayOffset() + dst.limit(); |
| assert (dp <= dl); |
| dp = (dp <= dl ? dp : dl); |
| |
| try { |
| while (sp < sl) { |
| char c = sa[sp]; |
| if (c < 0x80) { |
| if (dp >= dl) |
| return CoderResult.OVERFLOW; |
| da[dp] = (byte)c; |
| sp++; dp++; |
| continue; |
| } |
| if (sgp.parse(c, sa, sp, sl) < 0) |
| return sgp.error(); |
| return sgp.unmappableResult(); |
| } |
| 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 (c < 0x80) { |
| if (!dst.hasRemaining()) |
| return CoderResult.OVERFLOW; |
| dst.put((byte)c); |
| mark++; |
| continue; |
| } |
| if (sgp.parse(c, src) < 0) |
| return sgp.error(); |
| return sgp.unmappableResult(); |
| } |
| return CoderResult.UNDERFLOW; |
| } finally { |
| src.position(mark); |
| } |
| } |
| |
| protected CoderResult encodeLoop(CharBuffer src, |
| ByteBuffer dst) |
| { |
| if (src.hasArray() && dst.hasArray()) |
| return encodeArrayLoop(src, dst); |
| else |
| return encodeBufferLoop(src, dst); |
| } |
| |
| private byte repl = (byte)'?'; |
| protected void implReplaceWith(byte[] newReplacement) { |
| repl = newReplacement[0]; |
| } |
| |
| public int encode(char[] src, int sp, int len, byte[] dst) { |
| int dp = 0; |
| int sl = sp + Math.min(len, dst.length); |
| while (sp < sl) { |
| char c = src[sp++]; |
| if (c < 0x80) { |
| dst[dp++] = (byte)c; |
| continue; |
| } |
| if (Character.isHighSurrogate(c) && sp < sl && |
| Character.isLowSurrogate(src[sp])) { |
| if (len > dst.length) { |
| sl++; |
| len--; |
| } |
| sp++; |
| } |
| dst[dp++] = repl; |
| } |
| return dp; |
| } |
| |
| public boolean isASCIICompatible() { |
| return true; |
| } |
| } |
| |
| } |