| /* |
| * The Apache Software License, Version 1.1 |
| * |
| * Copyright (c) 2003 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "Ant" and "Apache Software |
| * Foundation" must not be used to endorse or promote products derived |
| * from this software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| |
| package org.apache.tools.ant.types.selectors.modifiedselector; |
| |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileOutputStream; |
| import java.security.DigestInputStream; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.security.NoSuchProviderException; |
| import org.apache.tools.ant.BuildException; |
| |
| |
| /** |
| * Computes a 'hashvalue' for the content of file using |
| * java.security.MessageDigest. |
| * Use of this algorithm doesn't require any additional nested <param>s. |
| * Supported <param>s are: |
| * <table> |
| * <tr> |
| * <th>name</th><th>values</th><th>description</th><th>required</th> |
| * </tr> |
| * <tr> |
| * <td> algorithm.algorithm </td> |
| * <td> MD5 | SHA (default provider) </td> |
| * <td> name of the algorithm the provider should use </td> |
| * <td> no, defaults to MD5 </td> |
| * </tr> |
| * <tr> |
| * <td> algorithm.provider </td> |
| * <td> </td> |
| * <td> name of the provider to use </td> |
| * <td> no, defaults to <i>null</i> </td> |
| * </tr> |
| * </table> |
| * |
| * @author Jan Mat\u00e8rne |
| * @version 2003-09-13 |
| * @since Ant 1.6 |
| */ |
| public class DigestAlgorithm implements Algorithm { |
| |
| |
| // ----- member variables ----- |
| |
| |
| /** |
| * MessageDigest algorithm to be used. |
| */ |
| private String algorithm = "MD5"; |
| |
| /** |
| * MessageDigest Algorithm provider |
| */ |
| private String provider = null; |
| |
| /** |
| * Message Digest instance |
| */ |
| private MessageDigest messageDigest = null; |
| |
| /** |
| * Size of the read buffer to use. |
| */ |
| private int readBufferSize = 8 * 1024; |
| |
| |
| // ----- Algorithm-Configuration ----- |
| |
| |
| /** |
| * Specifies the algorithm to be used to compute the checksum. |
| * Defaults to "MD5". Other popular algorithms like "SHA" may be used as well. |
| * @param algorithm the digest algorithm to use |
| */ |
| public void setAlgorithm(String algorithm) { |
| this.algorithm = algorithm; |
| } |
| |
| |
| /** |
| * Sets the MessageDigest algorithm provider to be used |
| * to calculate the checksum. |
| * @param provider provider to use |
| */ |
| public void setProvider(String provider) { |
| this.provider = provider; |
| } |
| |
| |
| /** Initialize the security message digest. */ |
| public void initMessageDigest() { |
| if (messageDigest != null) { |
| return; |
| } |
| |
| if ((provider != null) && !"".equals(provider) && !"null".equals(provider)) { |
| try { |
| messageDigest = MessageDigest.getInstance(algorithm, provider); |
| } catch (NoSuchAlgorithmException noalgo) { |
| throw new BuildException(noalgo); |
| } catch (NoSuchProviderException noprovider) { |
| throw new BuildException(noprovider); |
| } |
| } else { |
| try { |
| messageDigest = MessageDigest.getInstance(algorithm); |
| } catch (NoSuchAlgorithmException noalgo) { |
| throw new BuildException(noalgo); |
| } |
| } |
| } |
| |
| |
| // ----- Logic ----- |
| |
| |
| /** |
| * This algorithm doesn't need any configuration. |
| * Therefore it's always valid. |
| * @return <i>true</i> if all is ok, otherwise <i>false</i>. |
| */ |
| public boolean isValid() { |
| return true; |
| } |
| |
| |
| /** |
| * Computes a value for a file content with the specified digest algorithm. |
| * @param file File object for which the value should be evaluated. |
| * @return The value for that file |
| */ |
| // implementation adapted from ...taskdefs.Checksum, thanks to Magesh for hint |
| public String getValue(File file) { |
| initMessageDigest(); |
| String checksum = null; |
| try { |
| if (!file.canRead()) { |
| return null; |
| } |
| FileInputStream fis = null; |
| FileOutputStream fos = null; |
| byte[] buf = new byte[readBufferSize]; |
| try { |
| messageDigest.reset(); |
| fis = new FileInputStream(file); |
| DigestInputStream dis = new DigestInputStream(fis, |
| messageDigest); |
| while (dis.read(buf, 0, readBufferSize) != -1) { |
| // do nothing |
| } |
| dis.close(); |
| fis.close(); |
| fis = null; |
| byte[] fileDigest = messageDigest.digest(); |
| StringBuffer checksumSb = new StringBuffer(); |
| for (int i = 0; i < fileDigest.length; i++) { |
| String hexStr = Integer.toHexString(0x00ff & fileDigest[i]); |
| if (hexStr.length() < 2) { |
| checksumSb.append("0"); |
| } |
| checksumSb.append(hexStr); |
| } |
| checksum = checksumSb.toString(); |
| } catch (Exception e) { |
| return null; |
| } |
| } catch (Exception e) { |
| return null; |
| } |
| return checksum; |
| } |
| |
| |
| /** |
| * Override Object.toString(). |
| * @return some information about this algorithm. |
| */ |
| public String toString() { |
| StringBuffer buf = new StringBuffer(); |
| buf.append("<DigestAlgorithm:"); |
| buf.append("algorithm=").append(algorithm); |
| buf.append(";provider=").append(provider); |
| buf.append(">"); |
| return buf.toString(); |
| } |
| } |