--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/consumer/RecordingInput.java Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,339 @@
+/*
+ * Copyright (c) 2016, 2018, 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 jdk.jfr.internal.consumer;
+
+import java.io.DataInput;
+import java.io.EOFException;
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.charset.Charset;
+
+public final class RecordingInput implements DataInput, AutoCloseable {
+
+ public static final byte STRING_ENCODING_NULL = 0;
+ public static final byte STRING_ENCODING_EMPTY_STRING = 1;
+ public static final byte STRING_ENCODING_CONSTANT_POOL = 2;
+ public static final byte STRING_ENCODING_UTF8_BYTE_ARRAY = 3;
+ public static final byte STRING_ENCODING_CHAR_ARRAY = 4;
+ public static final byte STRING_ENCODING_LATIN1_BYTE_ARRAY = 5;
+
+ private final static int DEFAULT_BLOCK_SIZE = 16 * 1024 * 1024;
+ private final static Charset UTF8 = Charset.forName("UTF-8");
+ private final static Charset LATIN1 = Charset.forName("ISO-8859-1");
+
+ private static final class Block {
+ private byte[] bytes = new byte[0];
+ private long blockPosition;
+
+ boolean contains(long position) {
+ return position >= blockPosition && position < blockPosition + bytes.length;
+ }
+
+ public void read(RandomAccessFile file, int amount) throws IOException {
+ blockPosition = file.getFilePointer();
+ // reuse byte array, if possible
+ if (amount != bytes.length) {
+ bytes = new byte[amount];
+ }
+ file.readFully(bytes);
+ }
+
+ public byte get(long position) {
+ return bytes[(int) (position - blockPosition)];
+ }
+ }
+
+ private final RandomAccessFile file;
+ private final long size;
+ private Block currentBlock = new Block();
+ private Block previousBlock = new Block();
+ private long position;
+ private final int blockSize;
+
+ private RecordingInput(File f, int blockSize) throws IOException {
+ this.size = f.length();
+ this.blockSize = blockSize;
+ this.file = new RandomAccessFile(f, "r");
+ if (size < 8) {
+ throw new IOException("Not a valid Flight Recorder file. File length is only " + size + " bytes.");
+ }
+ }
+
+ public RecordingInput(File f) throws IOException {
+ this(f, DEFAULT_BLOCK_SIZE);
+ }
+
+ @Override
+ public final byte readByte() throws IOException {
+ if (!currentBlock.contains(position)) {
+ position(position);
+ }
+ return currentBlock.get(position++);
+ }
+
+ @Override
+ public final void readFully(byte[] dest, int offset, int length) throws IOException {
+ // TODO: Optimize, use Arrays.copy if all bytes are in current block
+ // array
+ for (int i = 0; i < length; i++) {
+ dest[i + offset] = readByte();
+ }
+ }
+
+ @Override
+ public final void readFully(byte[] dst) throws IOException {
+ readFully(dst, 0, dst.length);
+ }
+
+ public final short readRawShort() throws IOException {
+ // copied from java.io.Bits
+ byte b0 = readByte();
+ byte b1 = readByte();
+ return (short) ((b1 & 0xFF) + (b0 << 8));
+ }
+
+ @Override
+ public final double readDouble() throws IOException {
+ // copied from java.io.Bits
+ return Double.longBitsToDouble(readRawLong());
+ }
+
+ @Override
+ public final float readFloat() throws IOException {
+ // copied from java.io.Bits
+ return Float.intBitsToFloat(readRawInt());
+ }
+
+ public final int readRawInt() throws IOException {
+ // copied from java.io.Bits
+ byte b0 = readByte();
+ byte b1 = readByte();
+ byte b2 = readByte();
+ byte b3 = readByte();
+ return ((b3 & 0xFF)) + ((b2 & 0xFF) << 8) + ((b1 & 0xFF) << 16) + ((b0) << 24);
+ }
+
+ public final long readRawLong() throws IOException {
+ // copied from java.io.Bits
+ byte b0 = readByte();
+ byte b1 = readByte();
+ byte b2 = readByte();
+ byte b3 = readByte();
+ byte b4 = readByte();
+ byte b5 = readByte();
+ byte b6 = readByte();
+ byte b7 = readByte();
+ return ((b7 & 0xFFL)) + ((b6 & 0xFFL) << 8) + ((b5 & 0xFFL) << 16) + ((b4 & 0xFFL) << 24) + ((b3 & 0xFFL) << 32) + ((b2 & 0xFFL) << 40) + ((b1 & 0xFFL) << 48) + (((long) b0) << 56);
+ }
+
+ public final long position() throws IOException {
+ return position;
+ }
+
+ public final void position(long newPosition) throws IOException {
+ if (!currentBlock.contains(newPosition)) {
+ if (!previousBlock.contains(newPosition)) {
+ if (newPosition > size()) {
+ throw new EOFException("Trying to read at " + newPosition + ", but file is only " + size() + " bytes.");
+ }
+ long blockStart = trimToFileSize(calculateBlockStart(newPosition));
+ file.seek(blockStart);
+ // trim amount to file size
+ long amount = Math.min(size() - blockStart, blockSize);
+ previousBlock.read(file, (int) amount);
+ }
+ // swap previous and current
+ Block tmp = currentBlock;
+ currentBlock = previousBlock;
+ previousBlock = tmp;
+ }
+ position = newPosition;
+ }
+
+ private final long trimToFileSize(long position) throws IOException {
+ return Math.min(size(), Math.max(0, position));
+ }
+
+ private final long calculateBlockStart(long newPosition) {
+ // align to end of current block
+ if (currentBlock.contains(newPosition - blockSize)) {
+ return currentBlock.blockPosition + currentBlock.bytes.length;
+ }
+ // align before current block
+ if (currentBlock.contains(newPosition + blockSize)) {
+ return currentBlock.blockPosition - blockSize;
+ }
+ // not near current block, pick middle
+ return newPosition - blockSize / 2;
+ }
+
+ public final long size() throws IOException {
+ return size;
+ }
+
+ public final void close() throws IOException {
+ file.close();
+ }
+
+ @Override
+ public final int skipBytes(int n) throws IOException {
+ long position = position();
+ position(position + n);
+ return (int) (position() - position);
+ }
+
+ @Override
+ public final boolean readBoolean() throws IOException {
+ return readByte() != 0;
+ }
+
+ @Override
+ public int readUnsignedByte() throws IOException {
+ return readByte() & 0x00FF;
+ }
+
+ @Override
+ public int readUnsignedShort() throws IOException {
+ return readShort() & 0xFFFF;
+ }
+
+ @Override
+ public final String readLine() throws IOException {
+ throw new UnsupportedOperationException();
+ }
+
+ // NOTE, this method should really be called readString
+ // but can't be renamed without making RecordingInput a
+ // public class.
+ //
+ // This method DOES Not read as expected (s2 + utf8 encoded character)
+ // instead it read:
+ // byte encoding
+ // int size
+ // data (byte or char)
+ //
+ // where encoding
+ //
+ // 0, means null
+ // 1, means UTF8 encoded byte array
+ // 2, means char array
+ // 3, means latin-1 (ISO-8859-1) encoded byte array
+ // 4, means ""
+ @Override
+ public String readUTF() throws IOException {
+ return readEncodedString(readByte());
+ }
+
+ public String readEncodedString(byte encoding) throws IOException {
+ if (encoding == STRING_ENCODING_NULL) {
+ return null;
+ }
+ if (encoding == STRING_ENCODING_EMPTY_STRING) {
+ return "";
+ }
+ int size = readInt();
+ if (encoding == STRING_ENCODING_CHAR_ARRAY) {
+ char[] c = new char[size];
+ for (int i = 0; i < size; i++) {
+ c[i] = readChar();
+ }
+ return new String(c);
+ }
+ byte[] bytes = new byte[size];
+ readFully(bytes); // TODO: optimize, check size, and copy only if needed
+ if (encoding == STRING_ENCODING_UTF8_BYTE_ARRAY) {
+ return new String(bytes, UTF8);
+ }
+
+ if (encoding == STRING_ENCODING_LATIN1_BYTE_ARRAY) {
+ return new String(bytes, LATIN1);
+ }
+ throw new IOException("Unknown string encoding " + encoding);
+ }
+
+ @Override
+ public char readChar() throws IOException {
+ return (char) readLong();
+ }
+
+ @Override
+ public short readShort() throws IOException {
+ return (short) readLong();
+ }
+
+ @Override
+ public int readInt() throws IOException {
+ return (int) readLong();
+ }
+
+ @Override
+ public long readLong() throws IOException {
+ // can be optimized by branching checks, but will do for now
+ byte b0 = readByte();
+ long ret = (b0 & 0x7FL);
+ if (b0 >= 0) {
+ return ret;
+ }
+ int b1 = readByte();
+ ret += (b1 & 0x7FL) << 7;
+ if (b1 >= 0) {
+ return ret;
+ }
+ int b2 = readByte();
+ ret += (b2 & 0x7FL) << 14;
+ if (b2 >= 0) {
+ return ret;
+ }
+ int b3 = readByte();
+ ret += (b3 & 0x7FL) << 21;
+ if (b3 >= 0) {
+ return ret;
+ }
+ int b4 = readByte();
+ ret += (b4 & 0x7FL) << 28;
+ if (b4 >= 0) {
+ return ret;
+ }
+ int b5 = readByte();
+ ret += (b5 & 0x7FL) << 35;
+ if (b5 >= 0) {
+ return ret;
+ }
+ int b6 = readByte();
+ ret += (b6 & 0x7FL) << 42;
+ if (b6 >= 0) {
+ return ret;
+ }
+ int b7 = readByte();
+ ret += (b7 & 0x7FL) << 49;
+ if (b7 >= 0) {
+ return ret;
+ }
+ int b8 = readByte(); // read last byte raw
+ return ret + (((long) (b8 & 0XFF)) << 56);
+ }
+}