| /******************************************************************************* |
| * Copyright (c) 2009, 2018 Mountainminds GmbH & Co. KG and Contributors |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Marc R. Hoffmann - initial API and implementation |
| * |
| *******************************************************************************/ |
| package org.jacoco.core.internal.data; |
| |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * Additional data input methods for compact storage of data structures. |
| * |
| * @see CompactDataOutput |
| */ |
| public class CompactDataInput extends DataInputStream { |
| |
| /** |
| * Creates a new {@link CompactDataInput} that uses the specified underlying |
| * input stream. |
| * |
| * @param in |
| * underlying input stream |
| */ |
| public CompactDataInput(final InputStream in) { |
| super(in); |
| } |
| |
| /** |
| * Reads a variable length representation of an integer value. |
| * |
| * @return read value |
| * @throws IOException |
| * if thrown by the underlying stream |
| */ |
| public int readVarInt() throws IOException { |
| final int value = 0xFF & readByte(); |
| if ((value & 0x80) == 0) { |
| return value; |
| } |
| return (value & 0x7F) | (readVarInt() << 7); |
| } |
| |
| /** |
| * Reads a boolean array. |
| * |
| * @return boolean array |
| * @throws IOException |
| * if thrown by the underlying stream |
| */ |
| public boolean[] readBooleanArray() throws IOException { |
| final boolean[] value = new boolean[readVarInt()]; |
| int buffer = 0; |
| for (int i = 0; i < value.length; i++) { |
| if ((i % 8) == 0) { |
| buffer = readByte(); |
| } |
| value[i] = (buffer & 0x01) != 0; |
| buffer >>>= 1; |
| } |
| return value; |
| } |
| |
| } |