1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Eclipse Public License, Version 1.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.eclipse.org/org/documents/epl-v10.php 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.ide.eclipse.adt.internal.editors.binaryxml; 18 19 import org.eclipse.core.runtime.QualifiedName; 20 import org.eclipse.core.runtime.content.IContentDescriber; 21 import org.eclipse.core.runtime.content.IContentDescription; 22 23 import java.io.IOException; 24 import java.io.InputStream; 25 import java.nio.ByteBuffer; 26 import java.nio.ByteOrder; 27 28 /** 29 * A content describer for Android binary xml files 30 * 31 * <p> 32 * This class referenced by the "describer" configuration element in 33 * extensions to the <code>org.eclipse.core.runtime.contentTypes</code> 34 * extension point. 35 * </p> 36 * 37 * References : 38 * <a>http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob; 39 * f=include/utils/ResourceTypes.h</a> 40 * 41 */ 42 public class BinaryXMLDescriber implements IContentDescriber { 43 44 private static final int RES_XML_HEADER_SIZE = 8; 45 private final static short RES_XML_TYPE = 0x0003; 46 47 /* 48 * (non-Javadoc) 49 * @see org.eclipse.core.runtime.content.IContentDescriber#describe(java.io. 50 * InputStream, org.eclipse.core.runtime.content.IContentDescription) 51 */ 52 @Override describe(InputStream contents, IContentDescription description)53 public int describe(InputStream contents, IContentDescription description) throws IOException { 54 int status = INVALID; 55 int length = 8; 56 byte[] bytes = new byte[length]; 57 if (contents.read(bytes, 0, length) == length) { 58 ByteBuffer buf = ByteBuffer.wrap(bytes); 59 buf.order(ByteOrder.LITTLE_ENDIAN); 60 short type = buf.getShort(); 61 short headerSize = buf.getShort(); 62 int size = buf.getInt(); // chunk size 63 if (type == RES_XML_TYPE && headerSize == RES_XML_HEADER_SIZE) { 64 status = VALID; 65 } 66 } 67 return status; 68 } 69 70 /* 71 * (non-Javadoc) 72 * @see 73 * org.eclipse.core.runtime.content.IContentDescriber#getSupportedOptions() 74 */ 75 @Override getSupportedOptions()76 public QualifiedName[] getSupportedOptions() { 77 return new QualifiedName[0]; 78 } 79 80 } 81