| /******************************************************************************* |
| * Copyright (c) 2009, 2017 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; |
| |
| import java.io.BufferedInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.objectweb.asm.Opcodes; |
| |
| /** |
| * Detector for content types of binary streams based on a magic headers. |
| */ |
| public class ContentTypeDetector { |
| |
| /** Unknown file type */ |
| public static final int UNKNOWN = -1; |
| |
| /** File type Java class */ |
| public static final int CLASSFILE = 0xcafebabe; |
| |
| /** File type ZIP archive */ |
| public static final int ZIPFILE = 0x504b0304; |
| |
| /** File type GZIP compressed Data */ |
| public static final int GZFILE = 0x1f8b0000; |
| |
| /** File type Pack200 archive */ |
| public static final int PACK200FILE = 0xcafed00d; |
| |
| private static final int BUFFER_SIZE = 8; |
| |
| private final InputStream in; |
| |
| private final int type; |
| |
| /** |
| * Creates a new detector based on the given input. To process the complete |
| * original input afterwards use the stream returned by |
| * {@link #getInputStream()}. |
| * |
| * @param in |
| * input to read the header from |
| * @throws IOException |
| * if the stream can't be read |
| */ |
| public ContentTypeDetector(final InputStream in) throws IOException { |
| if (in.markSupported()) { |
| this.in = in; |
| } else { |
| this.in = new BufferedInputStream(in, BUFFER_SIZE); |
| } |
| this.in.mark(BUFFER_SIZE); |
| this.type = determineType(this.in); |
| this.in.reset(); |
| } |
| |
| private static int determineType(final InputStream in) throws IOException { |
| final int header = readInt(in); |
| switch (header) { |
| case ZIPFILE: |
| return ZIPFILE; |
| case PACK200FILE: |
| return PACK200FILE; |
| case CLASSFILE: |
| // also verify version to distinguish from Mach Object files: |
| switch (readInt(in)) { |
| case Opcodes.V1_1: |
| case Opcodes.V1_2: |
| case Opcodes.V1_3: |
| case Opcodes.V1_4: |
| case Opcodes.V1_5: |
| case Opcodes.V1_6: |
| case Opcodes.V1_7: |
| case Opcodes.V1_8: |
| case Opcodes.V9: |
| return CLASSFILE; |
| } |
| } |
| if ((header & 0xffff0000) == GZFILE) { |
| return GZFILE; |
| } |
| return UNKNOWN; |
| } |
| |
| private static int readInt(final InputStream in) throws IOException { |
| return in.read() << 24 | in.read() << 16 | in.read() << 8 | in.read(); |
| } |
| |
| /** |
| * Returns an input stream instance to read the complete content (including |
| * the header) of the underlying stream. |
| * |
| * @return input stream containing the complete content |
| */ |
| public InputStream getInputStream() { |
| return in; |
| } |
| |
| /** |
| * Returns the detected file type. |
| * |
| * @return file type |
| */ |
| public int getType() { |
| return type; |
| } |
| |
| } |