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/*******************************************************************************
* Copyright (c) 2011 Boeing.
* 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:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.framework.ui.skynet.render.imageDetection;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import javax.xml.bind.DatatypeConverter;
/**
* @author Jeff C. phillips
*/
public class WordImageCompare {
/**
* Compares images by detecting if they are compressed and using GZIPInputStream to deflate them or compares images
* by using the equals method.
*/
public boolean compareFiles(String firstFile, String secondFile) throws IOException {
return handleCompare(firstFile, secondFile);
}
private boolean handleCompare(String firstFile, String secondFile) throws IOException {
boolean isEqual = false;
EMZHtmlImageHandler handler = new EMZHtmlImageHandler();
InputStream firstStream = getInputStream(firstFile);
InputStream secondStream = getInputStream(secondFile);
if (handler.isValid(firstStream) && handler.isValid(secondStream)) {
isEqual = compareGZIPImages(getUncompressedByteArray(firstStream), getUncompressedByteArray(secondStream));
} else {
isEqual = firstFile.equals(secondFile);
}
return isEqual;
}
private InputStream getInputStream(String file) {
byte[] data = DatatypeConverter.parseBase64Binary(file);
return new ByteArrayInputStream(data);
}
private byte[] getUncompressedByteArray(InputStream inputStream) throws IOException {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
EMZHtmlImageHandler handler = new EMZHtmlImageHandler();
handler.convert(inputStream, outputStream);
return outputStream.toByteArray();
}
private boolean compareGZIPImages(byte[] firstbytes, byte[] secondbytes) {
boolean isEqual = false;
if (firstbytes.length == secondbytes.length && secondbytes.length > 0) {
isEqual = true;
for (int i = 0; i < firstbytes.length; i++) {
isEqual &= firstbytes[i] == secondbytes[i];
}
}
return isEqual;
}
}
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