zxingorg/src/com/google/zxing/web/DecodeServlet.java - platform/external/zxing - Git at Google

 /*
  * Copyright 2008 ZXing authors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 package com.google.zxing.web;

 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.BinaryBitmap;
 import com.google.zxing.ChecksumException;
 import com.google.zxing.DecodeHintType;
 import com.google.zxing.FormatException;
 import com.google.zxing.LuminanceSource;
 import com.google.zxing.MultiFormatReader;
 import com.google.zxing.NotFoundException;
 import com.google.zxing.Reader;
 import com.google.zxing.ReaderException;
 import com.google.zxing.Result;
 import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
 import com.google.zxing.common.GlobalHistogramBinarizer;
 import com.google.zxing.common.HybridBinarizer;

 import com.google.zxing.multi.GenericMultipleBarcodeReader;
 import com.google.zxing.multi.MultipleBarcodeReader;
 import org.apache.commons.fileupload.FileItem;
 import org.apache.commons.fileupload.FileUploadException;
 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
 import org.apache.commons.fileupload.servlet.ServletFileUpload;
 import org.apache.http.Header;
 import org.apache.http.HttpMessage;
 import org.apache.http.HttpResponse;
 import org.apache.http.HttpVersion;
 import org.apache.http.HttpEntity;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.client.methods.HttpUriRequest;
 import org.apache.http.conn.scheme.PlainSocketFactory;
 import org.apache.http.conn.scheme.Scheme;
 import org.apache.http.conn.scheme.SchemeRegistry;
 import org.apache.http.conn.ssl.SSLSocketFactory;
 import org.apache.http.conn.ClientConnectionManager;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.impl.conn.SingleClientConnManager;
 import org.apache.http.params.BasicHttpParams;
 import org.apache.http.params.HttpParams;
 import org.apache.http.params.HttpProtocolParams;

 import java.awt.color.CMMException;
 import java.awt.image.BufferedImage;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStreamWriter;
 import java.io.Writer;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Hashtable;
 import java.util.List;
 import java.util.Vector;
 import java.util.logging.Logger;

 import javax.imageio.ImageIO;
 import javax.servlet.ServletConfig;
 import javax.servlet.ServletException;
 import javax.servlet.ServletRequest;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 /**
  * {@link HttpServlet} which decodes images containing barcodes. Given a URL, it will
  * retrieve the image and decode it. It can also process image files uploaded via POST.
  *
  * @author Sean Owen
  */
 public final class DecodeServlet extends HttpServlet {

   // No real reason to let people upload more than a 2MB image
   private static final long MAX_IMAGE_SIZE = 2000000L;
   // No real reason to deal with more than maybe 2 megapixels
   private static final int MAX_PIXELS = 1 << 21;

   private static final Logger log = Logger.getLogger(DecodeServlet.class.getName());

   static final Hashtable<DecodeHintType, Object> HINTS;
   static final Hashtable<DecodeHintType, Object> HINTS_PURE;

   static {
     HINTS = new Hashtable<DecodeHintType, Object>(5);
     HINTS.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
     Collection<BarcodeFormat> possibleFormats = new Vector<BarcodeFormat>(17);
     possibleFormats.add(BarcodeFormat.UPC_A);
     possibleFormats.add(BarcodeFormat.UPC_E);
     possibleFormats.add(BarcodeFormat.EAN_8);
     possibleFormats.add(BarcodeFormat.EAN_13);
     possibleFormats.add(BarcodeFormat.CODE_39);
     possibleFormats.add(BarcodeFormat.CODE_93);
     possibleFormats.add(BarcodeFormat.CODE_128);
     //possibleFormats.add(BarcodeFormat.CODABAR);
     possibleFormats.add(BarcodeFormat.ITF);
     possibleFormats.add(BarcodeFormat.RSS14);
     possibleFormats.add(BarcodeFormat.QR_CODE);
     possibleFormats.add(BarcodeFormat.DATA_MATRIX);
     possibleFormats.add(BarcodeFormat.PDF417);
     HINTS.put(DecodeHintType.POSSIBLE_FORMATS, possibleFormats);
     HINTS_PURE = new Hashtable<DecodeHintType, Object>(HINTS);
     HINTS_PURE.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
   }

   private HttpParams params;
   private SchemeRegistry registry;
   private DiskFileItemFactory diskFileItemFactory;

   @Override
   public void init(ServletConfig servletConfig) {

     Logger logger = Logger.getLogger("com.google.zxing");
     logger.addHandler(new ServletContextLogHandler(servletConfig.getServletContext()));

     params = new BasicHttpParams();
     HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);

     registry = new SchemeRegistry();
     registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
     registry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));

     diskFileItemFactory = new DiskFileItemFactory();

     log.info("DecodeServlet configured");
   }

   @Override
   protected void doGet(HttpServletRequest request, HttpServletResponse response)
       throws ServletException, IOException {
     String imageURIString = request.getParameter("u");
     if (imageURIString == null || imageURIString.length() == 0) {
       log.fine("URI was empty");
       response.sendRedirect("badurl.jspx");
       return;
     }

     imageURIString = imageURIString.trim();

     if (!(imageURIString.startsWith("http://") || imageURIString.startsWith("https://"))) {
       imageURIString = "http://" + imageURIString;
     }

     URI imageURI;
     try {
       imageURI = new URI(imageURIString);
     } catch (URISyntaxException urise) {
       log.fine("URI was not valid: " + imageURIString);
       response.sendRedirect("badurl.jspx");
       return;
     }

     ClientConnectionManager connectionManager = new SingleClientConnManager(params, registry);
     HttpClient client = new DefaultHttpClient(connectionManager, params);

     HttpUriRequest getRequest = new HttpGet(imageURI);
     getRequest.addHeader("Connection", "close"); // Avoids CLOSE_WAIT socket issue?

     try {

       HttpResponse getResponse;
       try {
         getResponse = client.execute(getRequest);
       } catch (IllegalArgumentException iae) {
         // Thrown if hostname is bad or null
         log.fine(iae.toString());
         getRequest.abort();
         response.sendRedirect("badurl.jspx");
         return;
       } catch (IOException ioe) {
         // Encompasses lots of stuff, including
         //  java.net.SocketException, java.net.UnknownHostException,
         //  javax.net.ssl.SSLPeerUnverifiedException,
         //  org.apache.http.NoHttpResponseException,
         //  org.apache.http.client.ClientProtocolException,
         log.fine(ioe.toString());
         getRequest.abort();
         response.sendRedirect("badurl.jspx");
         return;
       }

       if (getResponse.getStatusLine().getStatusCode() != HttpServletResponse.SC_OK) {
         log.fine("Unsuccessful return code: " + getResponse.getStatusLine().getStatusCode());
         response.sendRedirect("badurl.jspx");
         return;
       }
       if (!isSizeOK(getResponse)) {
         log.fine("Too large");
         response.sendRedirect("badimage.jspx");
         return;
       }

       log.info("Decoding " + imageURI);
       HttpEntity entity = getResponse.getEntity();
       InputStream is = entity.getContent();
       try {
         processStream(is, request, response);
       } finally {
         entity.consumeContent();
         is.close();
       }

     } finally {
       connectionManager.shutdown();
     }

   }

   @Override
   protected void doPost(HttpServletRequest request, HttpServletResponse response)
           throws ServletException, IOException {

     if (!ServletFileUpload.isMultipartContent(request)) {
       log.fine("File upload was not multipart");
       response.sendRedirect("badimage.jspx");
       return;
     }

     ServletFileUpload upload = new ServletFileUpload(diskFileItemFactory);
     upload.setFileSizeMax(MAX_IMAGE_SIZE);

     // Parse the request
     try {
       for (FileItem item : (List<FileItem>) upload.parseRequest(request)) {
         if (!item.isFormField()) {
           if (item.getSize() <= MAX_IMAGE_SIZE) {
             log.info("Decoding uploaded file");
             InputStream is = item.getInputStream();
             try {
               processStream(is, request, response);
             } finally {
               is.close();
             }
           } else {
             log.fine("Too large");
             response.sendRedirect("badimage.jspx");
           }
           break;
         }
       }
     } catch (FileUploadException fue) {
       log.fine(fue.toString());
       response.sendRedirect("badimage.jspx");
     }

   }

   private static void processStream(InputStream is, ServletRequest request,
       HttpServletResponse response) throws ServletException, IOException {

     BufferedImage image;
     try {
       image = ImageIO.read(is);
     } catch (IOException ioe) {
       log.fine(ioe.toString());
       // Includes javax.imageio.IIOException
       response.sendRedirect("badimage.jspx");
       return;
     } catch (CMMException cmme) {
       log.fine(cmme.toString());
       // Have seen this in logs
       response.sendRedirect("badimage.jspx");
       return;
     } catch (IllegalArgumentException iae) {
       log.fine(iae.toString());
       // Have seen this in logs for some JPEGs
       response.sendRedirect("badimage.jspx");
       return;
     }
     if (image == null) {
       response.sendRedirect("badimage.jspx");
       return;
     }
     if (image.getHeight() <= 1 || image.getWidth() <= 1 ||
         image.getHeight() * image.getWidth() > MAX_PIXELS) {
       log.fine("Dimensions too large: " + image.getWidth() + 'x' + image.getHeight());
       response.sendRedirect("badimage.jspx");
       return;
     }

     Reader reader = new MultiFormatReader();
     LuminanceSource source = new BufferedImageLuminanceSource(image);
     BinaryBitmap bitmap = new BinaryBitmap(new GlobalHistogramBinarizer(source));
     Collection<Result> results = new ArrayList<Result>(1);
     ReaderException savedException = null;

     try {
       // Look for multiple barcodes
       MultipleBarcodeReader multiReader = new GenericMultipleBarcodeReader(reader);
       Result[] theResults = multiReader.decodeMultiple(bitmap, HINTS);
       if (theResults != null) {
         results.addAll(Arrays.asList(theResults));
       }
     } catch (ReaderException re) {
       savedException = re;
     }

     if (results.isEmpty()) {
       try {
         // Look for pure barcode
         Result theResult = reader.decode(bitmap, HINTS_PURE);
         if (theResult != null) {
           results.add(theResult);
         }
       } catch (ReaderException re) {
         savedException = re;
       }
     }

     if (results.isEmpty()) {
       try {
         // Look for normal barcode in photo
         Result theResult = reader.decode(bitmap, HINTS);
         if (theResult != null) {
           results.add(theResult);
         }
       } catch (ReaderException re) {
         savedException = re;
       }
     }

     if (results.isEmpty()) {
       try {
         // Try again with other binarizer
         BinaryBitmap hybridBitmap = new BinaryBitmap(new HybridBinarizer(source));
         Result theResult = reader.decode(hybridBitmap, HINTS);
         if (theResult != null) {
           results.add(theResult);
         }
       } catch (ReaderException re) {
         savedException = re;
       }
     }

     if (results.isEmpty()) {
       handleException(savedException, response);
       return;
     }

     if (request.getParameter("full") == null) {
       response.setContentType("text/plain");
       response.setCharacterEncoding("UTF8");
       Writer out = new OutputStreamWriter(response.getOutputStream(), "UTF8");
       try {
         for (Result result : results) {
           out.write(result.getText());
           out.write('\n');
         }
       } finally {
         out.close();
       }
     } else {
       request.setAttribute("results", results);
       request.getRequestDispatcher("decoderesult.jspx").forward(request, response);
     }
   }

   private static void handleException(ReaderException re, HttpServletResponse response) throws IOException {
     if (re instanceof NotFoundException) {
       log.info("Not found: " + re);
       response.sendRedirect("notfound.jspx");
     } else if (re instanceof FormatException) {
       log.info("Format problem: " + re);
       response.sendRedirect("format.jspx");
     } else if (re instanceof ChecksumException) {
       log.info("Checksum problem: " + re);
       response.sendRedirect("format.jspx");
     } else {
       log.info("Unknown problem: " + re);
       response.sendRedirect("notfound.jspx");
     }
   }

   private static boolean isSizeOK(HttpMessage getResponse) {
     Header lengthHeader = getResponse.getLastHeader("Content-Length");
     if (lengthHeader != null) {
       long length = Long.parseLong(lengthHeader.getValue());
       if (length > MAX_IMAGE_SIZE) {
         return false;
       }
     }
     return true;
   }

   @Override
   public void destroy() {
     log.config("DecodeServlet shutting down...");
   }

 }
	/*
	* Copyright 2008 ZXing authors
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.google.zxing.web;

	import com.google.zxing.BarcodeFormat;
	import com.google.zxing.BinaryBitmap;
	import com.google.zxing.ChecksumException;
	import com.google.zxing.DecodeHintType;
	import com.google.zxing.FormatException;
	import com.google.zxing.LuminanceSource;
	import com.google.zxing.MultiFormatReader;
	import com.google.zxing.NotFoundException;
	import com.google.zxing.Reader;
	import com.google.zxing.ReaderException;
	import com.google.zxing.Result;
	import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
	import com.google.zxing.common.GlobalHistogramBinarizer;
	import com.google.zxing.common.HybridBinarizer;

	import com.google.zxing.multi.GenericMultipleBarcodeReader;
	import com.google.zxing.multi.MultipleBarcodeReader;
	import org.apache.commons.fileupload.FileItem;
	import org.apache.commons.fileupload.FileUploadException;
	import org.apache.commons.fileupload.disk.DiskFileItemFactory;
	import org.apache.commons.fileupload.servlet.ServletFileUpload;
	import org.apache.http.Header;
	import org.apache.http.HttpMessage;
	import org.apache.http.HttpResponse;
	import org.apache.http.HttpVersion;
	import org.apache.http.HttpEntity;
	import org.apache.http.client.HttpClient;
	import org.apache.http.client.methods.HttpGet;
	import org.apache.http.client.methods.HttpUriRequest;
	import org.apache.http.conn.scheme.PlainSocketFactory;
	import org.apache.http.conn.scheme.Scheme;
	import org.apache.http.conn.scheme.SchemeRegistry;
	import org.apache.http.conn.ssl.SSLSocketFactory;
	import org.apache.http.conn.ClientConnectionManager;
	import org.apache.http.impl.client.DefaultHttpClient;
	import org.apache.http.impl.conn.SingleClientConnManager;
	import org.apache.http.params.BasicHttpParams;
	import org.apache.http.params.HttpParams;
	import org.apache.http.params.HttpProtocolParams;

	import java.awt.color.CMMException;
	import java.awt.image.BufferedImage;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.OutputStreamWriter;
	import java.io.Writer;
	import java.net.URI;
	import java.net.URISyntaxException;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collection;
	import java.util.Hashtable;
	import java.util.List;
	import java.util.Vector;
	import java.util.logging.Logger;

	import javax.imageio.ImageIO;
	import javax.servlet.ServletConfig;
	import javax.servlet.ServletException;
	import javax.servlet.ServletRequest;
	import javax.servlet.http.HttpServlet;
	import javax.servlet.http.HttpServletRequest;
	import javax.servlet.http.HttpServletResponse;

	/**
	* {@link HttpServlet} which decodes images containing barcodes. Given a URL, it will
	* retrieve the image and decode it. It can also process image files uploaded via POST.
	*
	* @author Sean Owen
	*/
	public final class DecodeServlet extends HttpServlet {

	// No real reason to let people upload more than a 2MB image
	private static final long MAX_IMAGE_SIZE = 2000000L;
	// No real reason to deal with more than maybe 2 megapixels
	private static final int MAX_PIXELS = 1 << 21;

	private static final Logger log = Logger.getLogger(DecodeServlet.class.getName());

	static final Hashtable<DecodeHintType, Object> HINTS;
	static final Hashtable<DecodeHintType, Object> HINTS_PURE;

	static {
	HINTS = new Hashtable<DecodeHintType, Object>(5);
	HINTS.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
	Collection<BarcodeFormat> possibleFormats = new Vector<BarcodeFormat>(17);
	possibleFormats.add(BarcodeFormat.UPC_A);
	possibleFormats.add(BarcodeFormat.UPC_E);
	possibleFormats.add(BarcodeFormat.EAN_8);
	possibleFormats.add(BarcodeFormat.EAN_13);
	possibleFormats.add(BarcodeFormat.CODE_39);
	possibleFormats.add(BarcodeFormat.CODE_93);
	possibleFormats.add(BarcodeFormat.CODE_128);
	//possibleFormats.add(BarcodeFormat.CODABAR);
	possibleFormats.add(BarcodeFormat.ITF);
	possibleFormats.add(BarcodeFormat.RSS14);
	possibleFormats.add(BarcodeFormat.QR_CODE);
	possibleFormats.add(BarcodeFormat.DATA_MATRIX);
	possibleFormats.add(BarcodeFormat.PDF417);
	HINTS.put(DecodeHintType.POSSIBLE_FORMATS, possibleFormats);
	HINTS_PURE = new Hashtable<DecodeHintType, Object>(HINTS);
	HINTS_PURE.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
	}

	private HttpParams params;
	private SchemeRegistry registry;
	private DiskFileItemFactory diskFileItemFactory;

	@Override
	public void init(ServletConfig servletConfig) {

	Logger logger = Logger.getLogger("com.google.zxing");
	logger.addHandler(new ServletContextLogHandler(servletConfig.getServletContext()));

	params = new BasicHttpParams();
	HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);

	registry = new SchemeRegistry();
	registry.register(new Scheme("http", PlainSocketFactory.getSocketFactory(), 80));
	registry.register(new Scheme("https", SSLSocketFactory.getSocketFactory(), 443));

	diskFileItemFactory = new DiskFileItemFactory();

	log.info("DecodeServlet configured");
	}

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {
	String imageURIString = request.getParameter("u");
	if (imageURIString == null \|\| imageURIString.length() == 0) {
	log.fine("URI was empty");
	response.sendRedirect("badurl.jspx");
	return;
	}

	imageURIString = imageURIString.trim();

	if (!(imageURIString.startsWith("http://") \|\| imageURIString.startsWith("https://"))) {
	imageURIString = "http://" + imageURIString;
	}

	URI imageURI;
	try {
	imageURI = new URI(imageURIString);
	} catch (URISyntaxException urise) {
	log.fine("URI was not valid: " + imageURIString);
	response.sendRedirect("badurl.jspx");
	return;
	}

	ClientConnectionManager connectionManager = new SingleClientConnManager(params, registry);
	HttpClient client = new DefaultHttpClient(connectionManager, params);

	HttpUriRequest getRequest = new HttpGet(imageURI);
	getRequest.addHeader("Connection", "close"); // Avoids CLOSE_WAIT socket issue?

	try {

	HttpResponse getResponse;
	try {
	getResponse = client.execute(getRequest);
	} catch (IllegalArgumentException iae) {
	// Thrown if hostname is bad or null
	log.fine(iae.toString());
	getRequest.abort();
	response.sendRedirect("badurl.jspx");
	return;
	} catch (IOException ioe) {
	// Encompasses lots of stuff, including
	// java.net.SocketException, java.net.UnknownHostException,
	// javax.net.ssl.SSLPeerUnverifiedException,
	// org.apache.http.NoHttpResponseException,
	// org.apache.http.client.ClientProtocolException,
	log.fine(ioe.toString());
	getRequest.abort();
	response.sendRedirect("badurl.jspx");
	return;
	}

	if (getResponse.getStatusLine().getStatusCode() != HttpServletResponse.SC_OK) {
	log.fine("Unsuccessful return code: " + getResponse.getStatusLine().getStatusCode());
	response.sendRedirect("badurl.jspx");
	return;
	}
	if (!isSizeOK(getResponse)) {
	log.fine("Too large");
	response.sendRedirect("badimage.jspx");
	return;
	}

	log.info("Decoding " + imageURI);
	HttpEntity entity = getResponse.getEntity();
	InputStream is = entity.getContent();
	try {
	processStream(is, request, response);
	} finally {
	entity.consumeContent();
	is.close();
	}

	} finally {
	connectionManager.shutdown();
	}

	}

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {

	if (!ServletFileUpload.isMultipartContent(request)) {
	log.fine("File upload was not multipart");
	response.sendRedirect("badimage.jspx");
	return;
	}

	ServletFileUpload upload = new ServletFileUpload(diskFileItemFactory);
	upload.setFileSizeMax(MAX_IMAGE_SIZE);

	// Parse the request
	try {
	for (FileItem item : (List<FileItem>) upload.parseRequest(request)) {
	if (!item.isFormField()) {
	if (item.getSize() <= MAX_IMAGE_SIZE) {
	log.info("Decoding uploaded file");
	InputStream is = item.getInputStream();
	try {
	processStream(is, request, response);
	} finally {
	is.close();
	}
	} else {
	log.fine("Too large");
	response.sendRedirect("badimage.jspx");
	}
	break;
	}
	}
	} catch (FileUploadException fue) {
	log.fine(fue.toString());
	response.sendRedirect("badimage.jspx");
	}

	}

	private static void processStream(InputStream is, ServletRequest request,
	HttpServletResponse response) throws ServletException, IOException {

	BufferedImage image;
	try {
	image = ImageIO.read(is);
	} catch (IOException ioe) {
	log.fine(ioe.toString());
	// Includes javax.imageio.IIOException
	response.sendRedirect("badimage.jspx");
	return;
	} catch (CMMException cmme) {
	log.fine(cmme.toString());
	// Have seen this in logs
	response.sendRedirect("badimage.jspx");
	return;
	} catch (IllegalArgumentException iae) {
	log.fine(iae.toString());
	// Have seen this in logs for some JPEGs
	response.sendRedirect("badimage.jspx");
	return;
	}
	if (image == null) {
	response.sendRedirect("badimage.jspx");
	return;
	}
	if (image.getHeight() <= 1 \|\| image.getWidth() <= 1 \|\|
	image.getHeight() * image.getWidth() > MAX_PIXELS) {
	log.fine("Dimensions too large: " + image.getWidth() + 'x' + image.getHeight());
	response.sendRedirect("badimage.jspx");
	return;
	}

	Reader reader = new MultiFormatReader();
	LuminanceSource source = new BufferedImageLuminanceSource(image);
	BinaryBitmap bitmap = new BinaryBitmap(new GlobalHistogramBinarizer(source));
	Collection<Result> results = new ArrayList<Result>(1);
	ReaderException savedException = null;

	try {
	// Look for multiple barcodes
	MultipleBarcodeReader multiReader = new GenericMultipleBarcodeReader(reader);
	Result[] theResults = multiReader.decodeMultiple(bitmap, HINTS);
	if (theResults != null) {
	results.addAll(Arrays.asList(theResults));
	}
	} catch (ReaderException re) {
	savedException = re;
	}

	if (results.isEmpty()) {
	try {
	// Look for pure barcode
	Result theResult = reader.decode(bitmap, HINTS_PURE);
	if (theResult != null) {
	results.add(theResult);
	}
	} catch (ReaderException re) {
	savedException = re;
	}
	}

	if (results.isEmpty()) {
	try {
	// Look for normal barcode in photo
	Result theResult = reader.decode(bitmap, HINTS);
	if (theResult != null) {
	results.add(theResult);
	}
	} catch (ReaderException re) {
	savedException = re;
	}
	}

	if (results.isEmpty()) {
	try {
	// Try again with other binarizer
	BinaryBitmap hybridBitmap = new BinaryBitmap(new HybridBinarizer(source));
	Result theResult = reader.decode(hybridBitmap, HINTS);
	if (theResult != null) {
	results.add(theResult);
	}
	} catch (ReaderException re) {
	savedException = re;
	}
	}

	if (results.isEmpty()) {
	handleException(savedException, response);
	return;
	}

	if (request.getParameter("full") == null) {
	response.setContentType("text/plain");
	response.setCharacterEncoding("UTF8");
	Writer out = new OutputStreamWriter(response.getOutputStream(), "UTF8");
	try {
	for (Result result : results) {
	out.write(result.getText());
	out.write('\n');
	}
	} finally {
	out.close();
	}
	} else {
	request.setAttribute("results", results);
	request.getRequestDispatcher("decoderesult.jspx").forward(request, response);
	}
	}

	private static void handleException(ReaderException re, HttpServletResponse response) throws IOException {
	if (re instanceof NotFoundException) {
	log.info("Not found: " + re);
	response.sendRedirect("notfound.jspx");
	} else if (re instanceof FormatException) {
	log.info("Format problem: " + re);
	response.sendRedirect("format.jspx");
	} else if (re instanceof ChecksumException) {
	log.info("Checksum problem: " + re);
	response.sendRedirect("format.jspx");
	} else {
	log.info("Unknown problem: " + re);
	response.sendRedirect("notfound.jspx");
	}
	}

	private static boolean isSizeOK(HttpMessage getResponse) {
	Header lengthHeader = getResponse.getLastHeader("Content-Length");
	if (lengthHeader != null) {
	long length = Long.parseLong(lengthHeader.getValue());
	if (length > MAX_IMAGE_SIZE) {
	return false;
	}
	}
	return true;
	}

	@Override
	public void destroy() {
	log.config("DecodeServlet shutting down...");
	}

	}