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/*
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jfr.internal.consumer;
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import java.io.DataInput;
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import java.io.EOFException;
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import java.io.File;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.nio.charset.Charset;
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public final class RecordingInput implements DataInput, AutoCloseable {
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public static final byte STRING_ENCODING_NULL = 0;
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public static final byte STRING_ENCODING_EMPTY_STRING = 1;
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public static final byte STRING_ENCODING_CONSTANT_POOL = 2;
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public static final byte STRING_ENCODING_UTF8_BYTE_ARRAY = 3;
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public static final byte STRING_ENCODING_CHAR_ARRAY = 4;
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public static final byte STRING_ENCODING_LATIN1_BYTE_ARRAY = 5;
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private final static int DEFAULT_BLOCK_SIZE = 16 * 1024 * 1024;
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private final static Charset UTF8 = Charset.forName("UTF-8");
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private final static Charset LATIN1 = Charset.forName("ISO-8859-1");
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private static final class Block {
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private byte[] bytes = new byte[0];
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private long blockPosition;
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boolean contains(long position) {
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return position >= blockPosition && position < blockPosition + bytes.length;
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}
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public void read(RandomAccessFile file, int amount) throws IOException {
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blockPosition = file.getFilePointer();
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// reuse byte array, if possible
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if (amount != bytes.length) {
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bytes = new byte[amount];
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}
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file.readFully(bytes);
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}
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public byte get(long position) {
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return bytes[(int) (position - blockPosition)];
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}
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}
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private final RandomAccessFile file;
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private final long size;
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private Block currentBlock = new Block();
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private Block previousBlock = new Block();
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private long position;
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private final int blockSize;
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private RecordingInput(File f, int blockSize) throws IOException {
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this.size = f.length();
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this.blockSize = blockSize;
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this.file = new RandomAccessFile(f, "r");
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if (size < 8) {
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throw new IOException("Not a valid Flight Recorder file. File length is only " + size + " bytes.");
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}
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}
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public RecordingInput(File f) throws IOException {
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this(f, DEFAULT_BLOCK_SIZE);
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}
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@Override
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public final byte readByte() throws IOException {
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if (!currentBlock.contains(position)) {
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position(position);
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}
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return currentBlock.get(position++);
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}
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@Override
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public final void readFully(byte[] dest, int offset, int length) throws IOException {
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// TODO: Optimize, use Arrays.copy if all bytes are in current block
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// array
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for (int i = 0; i < length; i++) {
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dest[i + offset] = readByte();
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}
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}
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@Override
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public final void readFully(byte[] dst) throws IOException {
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readFully(dst, 0, dst.length);
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}
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public final short readRawShort() throws IOException {
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// copied from java.io.Bits
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byte b0 = readByte();
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byte b1 = readByte();
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return (short) ((b1 & 0xFF) + (b0 << 8));
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}
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@Override
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public final double readDouble() throws IOException {
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// copied from java.io.Bits
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return Double.longBitsToDouble(readRawLong());
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}
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@Override
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public final float readFloat() throws IOException {
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// copied from java.io.Bits
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return Float.intBitsToFloat(readRawInt());
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}
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public final int readRawInt() throws IOException {
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// copied from java.io.Bits
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byte b0 = readByte();
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byte b1 = readByte();
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byte b2 = readByte();
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byte b3 = readByte();
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return ((b3 & 0xFF)) + ((b2 & 0xFF) << 8) + ((b1 & 0xFF) << 16) + ((b0) << 24);
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}
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public final long readRawLong() throws IOException {
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// copied from java.io.Bits
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byte b0 = readByte();
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byte b1 = readByte();
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byte b2 = readByte();
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byte b3 = readByte();
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byte b4 = readByte();
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byte b5 = readByte();
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byte b6 = readByte();
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byte b7 = readByte();
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return ((b7 & 0xFFL)) + ((b6 & 0xFFL) << 8) + ((b5 & 0xFFL) << 16) + ((b4 & 0xFFL) << 24) + ((b3 & 0xFFL) << 32) + ((b2 & 0xFFL) << 40) + ((b1 & 0xFFL) << 48) + (((long) b0) << 56);
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}
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public final long position() throws IOException {
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return position;
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}
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public final void position(long newPosition) throws IOException {
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if (!currentBlock.contains(newPosition)) {
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if (!previousBlock.contains(newPosition)) {
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if (newPosition > size()) {
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throw new EOFException("Trying to read at " + newPosition + ", but file is only " + size() + " bytes.");
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}
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long blockStart = trimToFileSize(calculateBlockStart(newPosition));
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file.seek(blockStart);
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// trim amount to file size
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long amount = Math.min(size() - blockStart, blockSize);
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previousBlock.read(file, (int) amount);
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}
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// swap previous and current
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Block tmp = currentBlock;
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currentBlock = previousBlock;
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previousBlock = tmp;
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}
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position = newPosition;
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}
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private final long trimToFileSize(long position) throws IOException {
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return Math.min(size(), Math.max(0, position));
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}
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private final long calculateBlockStart(long newPosition) {
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// align to end of current block
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if (currentBlock.contains(newPosition - blockSize)) {
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return currentBlock.blockPosition + currentBlock.bytes.length;
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}
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// align before current block
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if (currentBlock.contains(newPosition + blockSize)) {
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return currentBlock.blockPosition - blockSize;
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}
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// not near current block, pick middle
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return newPosition - blockSize / 2;
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}
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public final long size() throws IOException {
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return size;
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}
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public final void close() throws IOException {
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file.close();
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}
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@Override
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public final int skipBytes(int n) throws IOException {
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long position = position();
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position(position + n);
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return (int) (position() - position);
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}
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@Override
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public final boolean readBoolean() throws IOException {
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return readByte() != 0;
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}
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@Override
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public int readUnsignedByte() throws IOException {
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return readByte() & 0x00FF;
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}
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@Override
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public int readUnsignedShort() throws IOException {
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return readShort() & 0xFFFF;
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}
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@Override
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public final String readLine() throws IOException {
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throw new UnsupportedOperationException();
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}
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// NOTE, this method should really be called readString
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// but can't be renamed without making RecordingInput a
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// public class.
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//
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// This method DOES Not read as expected (s2 + utf8 encoded character)
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// instead it read:
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// byte encoding
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// int size
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// data (byte or char)
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//
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// where encoding
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//
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// 0, means null
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// 1, means UTF8 encoded byte array
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// 2, means char array
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// 3, means latin-1 (ISO-8859-1) encoded byte array
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// 4, means ""
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@Override
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public String readUTF() throws IOException {
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return readEncodedString(readByte());
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}
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public String readEncodedString(byte encoding) throws IOException {
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if (encoding == STRING_ENCODING_NULL) {
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return null;
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}
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if (encoding == STRING_ENCODING_EMPTY_STRING) {
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return "";
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}
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int size = readInt();
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if (encoding == STRING_ENCODING_CHAR_ARRAY) {
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char[] c = new char[size];
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for (int i = 0; i < size; i++) {
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c[i] = readChar();
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}
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return new String(c);
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}
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byte[] bytes = new byte[size];
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readFully(bytes); // TODO: optimize, check size, and copy only if needed
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if (encoding == STRING_ENCODING_UTF8_BYTE_ARRAY) {
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return new String(bytes, UTF8);
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}
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if (encoding == STRING_ENCODING_LATIN1_BYTE_ARRAY) {
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return new String(bytes, LATIN1);
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}
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throw new IOException("Unknown string encoding " + encoding);
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}
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@Override
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public char readChar() throws IOException {
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return (char) readLong();
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}
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@Override
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public short readShort() throws IOException {
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return (short) readLong();
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}
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@Override
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public int readInt() throws IOException {
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return (int) readLong();
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}
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@Override
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public long readLong() throws IOException {
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// can be optimized by branching checks, but will do for now
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byte b0 = readByte();
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long ret = (b0 & 0x7FL);
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if (b0 >= 0) {
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return ret;
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}
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int b1 = readByte();
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ret += (b1 & 0x7FL) << 7;
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if (b1 >= 0) {
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return ret;
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}
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int b2 = readByte();
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ret += (b2 & 0x7FL) << 14;
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if (b2 >= 0) {
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return ret;
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}
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int b3 = readByte();
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ret += (b3 & 0x7FL) << 21;
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if (b3 >= 0) {
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return ret;
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}
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int b4 = readByte();
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ret += (b4 & 0x7FL) << 28;
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if (b4 >= 0) {
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return ret;
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}
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int b5 = readByte();
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ret += (b5 & 0x7FL) << 35;
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if (b5 >= 0) {
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return ret;
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}
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int b6 = readByte();
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ret += (b6 & 0x7FL) << 42;
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if (b6 >= 0) {
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return ret;
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}
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int b7 = readByte();
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ret += (b7 & 0x7FL) << 49;
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if (b7 >= 0) {
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return ret;
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}
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int b8 = readByte(); // read last byte raw
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return ret + (((long) (b8 & 0XFF)) << 56);
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}
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}
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