| /* |
| * 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); |
| } |
| } |