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.client.j2se.ImageReader;
 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.FileCleanerCleanup;
 import org.apache.commons.fileupload.servlet.ServletFileUpload;
 import org.apache.commons.io.FileCleaningTracker;

 import java.awt.color.CMMException;
 import java.awt.image.BufferedImage;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStreamWriter;
 import java.io.Writer;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URI;
 import java.net.URISyntaxException;
 import java.net.URL;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.EnumMap;
 import java.util.EnumSet;
 import java.util.Map;
 import java.util.logging.Logger;

 import javax.imageio.ImageIO;
 import javax.servlet.ServletConfig;
 import javax.servlet.ServletContext;
 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 {

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

   // 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 8.3 megapixels
   private static final int MAX_PIXELS = 1 << 23;
   private static final byte[] REMAINDER_BUFFER = new byte[8192];
   private static final Map<DecodeHintType,Object> HINTS;
   private static final Map<DecodeHintType,Object> HINTS_PURE;

   static {
     HINTS = new EnumMap<DecodeHintType,Object>(DecodeHintType.class);
     HINTS.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
     HINTS.put(DecodeHintType.POSSIBLE_FORMATS, EnumSet.allOf(BarcodeFormat.class));
     HINTS_PURE = new EnumMap<DecodeHintType,Object>(HINTS);
     HINTS_PURE.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
   }

   private DiskFileItemFactory diskFileItemFactory;

   @Override
   public void init(ServletConfig servletConfig) {
     Logger logger = Logger.getLogger("com.google.zxing");
     ServletContext context = servletConfig.getServletContext();
     logger.addHandler(new ServletContextLogHandler(context));
     File repository = (File) context.getAttribute("javax.servlet.context.tempdir");
     FileCleaningTracker fileCleaningTracker = FileCleanerCleanup.getFileCleaningTracker(context);
     diskFileItemFactory = new DiskFileItemFactory(1 << 16, repository);
     diskFileItemFactory.setFileCleaningTracker(fileCleaningTracker);
   }

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

     String imageURIString = request.getParameter("u");
     if (imageURIString == null || imageURIString.isEmpty()) {
       log.info("URI was empty");
       response.sendRedirect("badurl.jspx");
       return;
     }

     imageURIString = imageURIString.trim();

     URI imageURI;
     try {
       imageURI = new URI(imageURIString);
       // Assume http: if not specified
       if (imageURI.getScheme() == null) {
         imageURI = new URI("http://" + imageURIString);
       }
     } catch (URISyntaxException urise) {
       log.info("URI " + imageURIString + " was not valid: " + urise);
       response.sendRedirect("badurl.jspx");
       return;
     }

     // Shortcut for data URI
     if ("data".equals(imageURI.getScheme())) {
       try {
         BufferedImage image = ImageReader.readDataURIImage(imageURI);
         processImage(image, request, response);
       } catch (IOException ioe) {
         log.info(ioe.toString());
         response.sendRedirect("badurl.jspx");
       }
       return;
     }

     URL imageURL;
     try {
       imageURL = imageURI.toURL();
     } catch (MalformedURLException ignored) {
       log.info("URI was not valid: " + imageURIString);
       response.sendRedirect("badurl.jspx");
       return;
     }

     HttpURLConnection connection;
     try {
       connection = (HttpURLConnection) imageURL.openConnection();
     } catch (IllegalArgumentException ignored) {
       log.info("URI could not be opened: " + imageURL);
       response.sendRedirect("badurl.jspx");
       return;
     }

     connection.setAllowUserInteraction(false);
     connection.setReadTimeout(5000);
     connection.setConnectTimeout(5000);
     connection.setRequestProperty("User-Agent", "zxing.org");
     connection.setRequestProperty("Connection", "close");

     try {

       try {
         connection.connect();
       } 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.info(ioe.toString());
         response.sendRedirect("badurl.jspx");
         return;
       }

       InputStream is = null;
       try {

         is = connection.getInputStream();

         if (connection.getResponseCode() != HttpServletResponse.SC_OK) {
           log.info("Unsuccessful return code: " + connection.getResponseCode());
           response.sendRedirect("badurl.jspx");
           return;
         }
         if (connection.getHeaderFieldInt("Content-Length", 0) > MAX_IMAGE_SIZE) {
           log.info("Too large");
           response.sendRedirect("badimage.jspx");
           return;
         }

         log.info("Decoding " + imageURL);
         processStream(is, request, response);

       } catch (IOException ioe) {
         log.info(ioe.toString());
         response.sendRedirect("badurl.jspx");
       } finally {
         if (is != null) {
           consumeRemainder(is);
           is.close();
         }
       }

     } finally {
       connection.disconnect();
     }

   }

   private static void consumeRemainder(InputStream is) {
     try {
       int available;
       while ((available = is.available()) > 0) {
         is.read(REMAINDER_BUFFER, 0, available); // don't care about value, or collision
       }
     } catch (IOException ioe) {
       // continue
     } catch (IndexOutOfBoundsException ioobe) {
       // sun.net.www.http.ChunkedInputStream.read is throwing this, continue
     }
   }

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

     if (!ServletFileUpload.isMultipartContent(request)) {
       log.info("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 : 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.info("Too large");
             response.sendRedirect("badimage.jspx");
           }
           break;
         }
       }
     } catch (FileUploadException fue) {
       log.info(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.info(ioe.toString());
       // Includes javax.imageio.IIOException
       response.sendRedirect("badimage.jspx");
       return;
     } catch (CMMException cmme) {
       log.info(cmme.toString());
       // Have seen this in logs
       response.sendRedirect("badimage.jspx");
       return;
     } catch (IllegalArgumentException iae) {
       log.info(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.info("Dimensions too large: " + image.getWidth() + 'x' + image.getHeight());
       response.sendRedirect("badimage.jspx");
       return;
     }

     processImage(image, request, response);
   }

   private static void processImage(BufferedImage image,
                                    ServletRequest request,
                                    HttpServletResponse response) throws IOException, ServletException {

     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;
     }

     String fullParameter = request.getParameter("full");
     boolean minimalOutput = fullParameter != null && !Boolean.parseBoolean(fullParameter);
     if (minimalOutput) {
       response.setContentType("text/plain");
       response.setCharacterEncoding("UTF8");
       Writer out = new OutputStreamWriter(response.getOutputStream(), Charset.forName("UTF-8"));
       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");
     }
   }

 }
	/*
	* 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.client.j2se.ImageReader;
	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.FileCleanerCleanup;
	import org.apache.commons.fileupload.servlet.ServletFileUpload;
	import org.apache.commons.io.FileCleaningTracker;

	import java.awt.color.CMMException;
	import java.awt.image.BufferedImage;
	import java.io.File;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.OutputStreamWriter;
	import java.io.Writer;
	import java.net.HttpURLConnection;
	import java.net.MalformedURLException;
	import java.net.URI;
	import java.net.URISyntaxException;
	import java.net.URL;
	import java.nio.charset.Charset;
	import java.util.ArrayList;
	import java.util.Arrays;
	import java.util.Collection;
	import java.util.EnumMap;
	import java.util.EnumSet;
	import java.util.Map;
	import java.util.logging.Logger;

	import javax.imageio.ImageIO;
	import javax.servlet.ServletConfig;
	import javax.servlet.ServletContext;
	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 {

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

	// 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 8.3 megapixels
	private static final int MAX_PIXELS = 1 << 23;
	private static final byte[] REMAINDER_BUFFER = new byte[8192];
	private static final Map<DecodeHintType,Object> HINTS;
	private static final Map<DecodeHintType,Object> HINTS_PURE;

	static {
	HINTS = new EnumMap<DecodeHintType,Object>(DecodeHintType.class);
	HINTS.put(DecodeHintType.TRY_HARDER, Boolean.TRUE);
	HINTS.put(DecodeHintType.POSSIBLE_FORMATS, EnumSet.allOf(BarcodeFormat.class));
	HINTS_PURE = new EnumMap<DecodeHintType,Object>(HINTS);
	HINTS_PURE.put(DecodeHintType.PURE_BARCODE, Boolean.TRUE);
	}

	private DiskFileItemFactory diskFileItemFactory;

	@Override
	public void init(ServletConfig servletConfig) {
	Logger logger = Logger.getLogger("com.google.zxing");
	ServletContext context = servletConfig.getServletContext();
	logger.addHandler(new ServletContextLogHandler(context));
	File repository = (File) context.getAttribute("javax.servlet.context.tempdir");
	FileCleaningTracker fileCleaningTracker = FileCleanerCleanup.getFileCleaningTracker(context);
	diskFileItemFactory = new DiskFileItemFactory(1 << 16, repository);
	diskFileItemFactory.setFileCleaningTracker(fileCleaningTracker);
	}

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

	String imageURIString = request.getParameter("u");
	if (imageURIString == null \|\| imageURIString.isEmpty()) {
	log.info("URI was empty");
	response.sendRedirect("badurl.jspx");
	return;
	}

	imageURIString = imageURIString.trim();

	URI imageURI;
	try {
	imageURI = new URI(imageURIString);
	// Assume http: if not specified
	if (imageURI.getScheme() == null) {
	imageURI = new URI("http://" + imageURIString);
	}
	} catch (URISyntaxException urise) {
	log.info("URI " + imageURIString + " was not valid: " + urise);
	response.sendRedirect("badurl.jspx");
	return;
	}

	// Shortcut for data URI
	if ("data".equals(imageURI.getScheme())) {
	try {
	BufferedImage image = ImageReader.readDataURIImage(imageURI);
	processImage(image, request, response);
	} catch (IOException ioe) {
	log.info(ioe.toString());
	response.sendRedirect("badurl.jspx");
	}
	return;
	}

	URL imageURL;
	try {
	imageURL = imageURI.toURL();
	} catch (MalformedURLException ignored) {
	log.info("URI was not valid: " + imageURIString);
	response.sendRedirect("badurl.jspx");
	return;
	}

	HttpURLConnection connection;
	try {
	connection = (HttpURLConnection) imageURL.openConnection();
	} catch (IllegalArgumentException ignored) {
	log.info("URI could not be opened: " + imageURL);
	response.sendRedirect("badurl.jspx");
	return;
	}

	connection.setAllowUserInteraction(false);
	connection.setReadTimeout(5000);
	connection.setConnectTimeout(5000);
	connection.setRequestProperty("User-Agent", "zxing.org");
	connection.setRequestProperty("Connection", "close");

	try {

	try {
	connection.connect();
	} 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.info(ioe.toString());
	response.sendRedirect("badurl.jspx");
	return;
	}

	InputStream is = null;
	try {

	is = connection.getInputStream();

	if (connection.getResponseCode() != HttpServletResponse.SC_OK) {
	log.info("Unsuccessful return code: " + connection.getResponseCode());
	response.sendRedirect("badurl.jspx");
	return;
	}
	if (connection.getHeaderFieldInt("Content-Length", 0) > MAX_IMAGE_SIZE) {
	log.info("Too large");
	response.sendRedirect("badimage.jspx");
	return;
	}

	log.info("Decoding " + imageURL);
	processStream(is, request, response);

	} catch (IOException ioe) {
	log.info(ioe.toString());
	response.sendRedirect("badurl.jspx");
	} finally {
	if (is != null) {
	consumeRemainder(is);
	is.close();
	}
	}

	} finally {
	connection.disconnect();
	}

	}

	private static void consumeRemainder(InputStream is) {
	try {
	int available;
	while ((available = is.available()) > 0) {
	is.read(REMAINDER_BUFFER, 0, available); // don't care about value, or collision
	}
	} catch (IOException ioe) {
	// continue
	} catch (IndexOutOfBoundsException ioobe) {
	// sun.net.www.http.ChunkedInputStream.read is throwing this, continue
	}
	}

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

	if (!ServletFileUpload.isMultipartContent(request)) {
	log.info("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 : 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.info("Too large");
	response.sendRedirect("badimage.jspx");
	}
	break;
	}
	}
	} catch (FileUploadException fue) {
	log.info(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.info(ioe.toString());
	// Includes javax.imageio.IIOException
	response.sendRedirect("badimage.jspx");
	return;
	} catch (CMMException cmme) {
	log.info(cmme.toString());
	// Have seen this in logs
	response.sendRedirect("badimage.jspx");
	return;
	} catch (IllegalArgumentException iae) {
	log.info(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.info("Dimensions too large: " + image.getWidth() + 'x' + image.getHeight());
	response.sendRedirect("badimage.jspx");
	return;
	}

	processImage(image, request, response);
	}

	private static void processImage(BufferedImage image,
	ServletRequest request,
	HttpServletResponse response) throws IOException, ServletException {

	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;
	}

	String fullParameter = request.getParameter("full");
	boolean minimalOutput = fullParameter != null && !Boolean.parseBoolean(fullParameter);
	if (minimalOutput) {
	response.setContentType("text/plain");
	response.setCharacterEncoding("UTF8");
	Writer out = new OutputStreamWriter(response.getOutputStream(), Charset.forName("UTF-8"));
	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");
	}
	}

	}