| /******************************************************************************* |
| * Copyright (c) 2005, 2007 IBM Corporation and others. |
| * 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: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.pde.internal.core.content; |
| |
| import java.io.*; |
| import org.eclipse.core.runtime.QualifiedName; |
| import org.eclipse.core.runtime.content.IContentDescription; |
| import org.eclipse.core.runtime.content.ITextContentDescriber; |
| import org.osgi.framework.Constants; |
| |
| public class BundleManifestDescriber implements ITextContentDescriber { |
| |
| private final static String[] HEADERS = {Constants.BUNDLE_MANIFESTVERSION, Constants.BUNDLE_NAME, Constants.BUNDLE_VERSION, Constants.BUNDLE_SYMBOLICNAME, Constants.BUNDLE_VENDOR, Constants.BUNDLE_ACTIVATOR}; |
| private final static int LINES = 50; |
| |
| private final static QualifiedName[] SUPPORTED_OPTIONS = {IContentDescription.BYTE_ORDER_MARK}; |
| |
| /* (Intentionally not included in javadoc) |
| * @see IContentDescriber#describe(InputStream, IContentDescription) |
| */ |
| public int describe(InputStream contents, IContentDescription description) throws IOException { |
| byte[] bom = getByteOrderMark(contents); |
| contents.reset(); |
| String charset = "UTF-8"; //$NON-NLS-1$ |
| if (bom != null) { |
| // has a bom |
| // remember to skip it |
| contents.skip(bom.length); |
| // compute a corresponding charset |
| if (bom == IContentDescription.BOM_UTF_8) |
| charset = "UTF-8"; //$NON-NLS-1$ |
| else if (bom == IContentDescription.BOM_UTF_16BE || bom == IContentDescription.BOM_UTF_16LE) |
| // UTF-16 will properly recognize the BOM |
| charset = "UTF-16"; //$NON-NLS-1$ |
| // fill description if requesed |
| if (description != null && description.isRequested(IContentDescription.BYTE_ORDER_MARK)) |
| description.setProperty(IContentDescription.BYTE_ORDER_MARK, bom); |
| } |
| BufferedReader reader = new BufferedReader(new InputStreamReader(contents, charset)); |
| String line; |
| for (int i = 0; ((line = reader.readLine()) != null) && i < LINES; i++) |
| if (matches(line)) |
| // found signature |
| return VALID; |
| // could not find signature |
| return INDETERMINATE; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.core.runtime.content.ITextContentDescriber#describe(java.io.Reader, org.eclipse.core.runtime.content.IContentDescription) |
| */ |
| public int describe(Reader contents, IContentDescription description) throws IOException { |
| BufferedReader reader = new BufferedReader(contents); |
| String line; |
| for (int i = 0; ((line = reader.readLine()) != null) && i < LINES; i++) |
| if (matches(line)) |
| return VALID; |
| return INDETERMINATE; |
| } |
| |
| byte[] getByteOrderMark(InputStream input) throws IOException { |
| int first = (input.read() & 0xFF);//converts unsigned byte to int |
| int second = (input.read() & 0xFF); |
| if (first == -1 || second == -1) |
| return null; |
| //look for the UTF-16 Byte Order Mark (BOM) |
| if (first == 0xFE && second == 0xFF) |
| return IContentDescription.BOM_UTF_16BE; |
| if (first == 0xFF && second == 0xFE) |
| return IContentDescription.BOM_UTF_16LE; |
| int third = (input.read() & 0xFF); |
| if (third == -1) |
| return null; |
| //look for the UTF-8 BOM |
| if (first == 0xEF && second == 0xBB && third == 0xBF) |
| return IContentDescription.BOM_UTF_8; |
| return null; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * @see org.eclipse.core.runtime.content.IContentDescriber#getSupportedOptions() |
| */ |
| public QualifiedName[] getSupportedOptions() { |
| return SUPPORTED_OPTIONS; |
| } |
| |
| private boolean matches(String line) { |
| for (int i = 0; i < HEADERS.length; i++) { |
| int length = HEADERS[i].length(); |
| if (line.length() >= length) |
| if (line.substring(0, length).equalsIgnoreCase(HEADERS[i])) |
| return true; |
| } |
| return false; |
| } |
| } |