8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/share/classes/sun/nio/cs/UnicodeDecoder.java

@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2000, 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.nio.cs;
+
+import java.nio.ByteBuffer;
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+import java.nio.charset.CharsetDecoder;
+import java.nio.charset.CoderResult;
+import java.nio.charset.CharacterCodingException;
+import java.nio.charset.MalformedInputException;
+
+
+abstract class UnicodeDecoder extends CharsetDecoder {
+
+    protected static final char BYTE_ORDER_MARK = (char) 0xfeff;
+    protected static final char REVERSED_MARK = (char) 0xfffe;
+
+    protected static final int NONE = 0;
+    protected static final int BIG = 1;
+    protected static final int LITTLE = 2;
+
+    private final int expectedByteOrder;
+    private int currentByteOrder;
+    private int defaultByteOrder = BIG;
+
+    public UnicodeDecoder(Charset cs, int bo) {
+        super(cs, 0.5f, 1.0f);
+        expectedByteOrder = currentByteOrder = bo;
+    }
+
+    public UnicodeDecoder(Charset cs, int bo, int defaultBO) {
+        this(cs, bo);
+        defaultByteOrder = defaultBO;
+    }
+
+    private char decode(int b1, int b2) {
+        if (currentByteOrder == BIG)
+            return (char)((b1 << 8) | b2);
+        else
+            return (char)((b2 << 8) | b1);
+    }
+
+    protected CoderResult decodeLoop(ByteBuffer src, CharBuffer dst) {
+        int mark = src.position();
+
+        try {
+            while (src.remaining() > 1) {
+                int b1 = src.get() & 0xff;
+                int b2 = src.get() & 0xff;
+
+                // Byte Order Mark interpretation
+                if (currentByteOrder == NONE) {
+                    char c = (char)((b1 << 8) | b2);
+                    if (c == BYTE_ORDER_MARK) {
+                        currentByteOrder = BIG;
+                        mark += 2;
+                        continue;
+                    } else if (c == REVERSED_MARK) {
+                        currentByteOrder = LITTLE;
+                        mark += 2;
+                        continue;
+                    } else {
+                        currentByteOrder = defaultByteOrder;
+                        // FALL THROUGH to process b1, b2 normally
+                    }
+                }
+
+                char c = decode(b1, b2);
+
+                if (c == REVERSED_MARK) {
+                    // A reversed BOM cannot occur within middle of stream
+                    return CoderResult.malformedForLength(2);
+                }
+
+                // Surrogates
+                if (Character.isSurrogate(c)) {
+                    if (Character.isHighSurrogate(c)) {
+                        if (src.remaining() < 2)
+                            return CoderResult.UNDERFLOW;
+                        char c2 = decode(src.get() & 0xff, src.get() & 0xff);
+                        if (!Character.isLowSurrogate(c2))
+                            return CoderResult.malformedForLength(4);
+                        if (dst.remaining() < 2)
+                            return CoderResult.OVERFLOW;
+                        mark += 4;
+                        dst.put(c);
+                        dst.put(c2);
+                        continue;
+                    }
+                    // Unpaired low surrogate
+                    return CoderResult.malformedForLength(2);
+                }
+
+                if (!dst.hasRemaining())
+                    return CoderResult.OVERFLOW;
+                mark += 2;
+                dst.put(c);
+
+            }
+            return CoderResult.UNDERFLOW;
+
+        } finally {
+            src.position(mark);
+        }
+    }
+
+    protected void implReset() {
+        currentByteOrder = expectedByteOrder;
+    }
+
+}