/**
* NanoDoA - File based document archive
*
* Copyright (C) 2011-2012 Christian Packenius, christian.packenius@googlemail.com
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package de.chris_soft.utilities;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PRStream;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStream;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.RandomAccessFileOrArray;
import com.itextpdf.text.pdf.codec.TiffImage;
import com.itextpdf.text.pdf.parser.PdfImageObject;
/**
* Utilities for tiff images.
* @author Christian Packenius.
*/
public class TiffUtils {
/**
* Converts a multiple page TIFF file into many PNG files. I'm not proud of this method, but it should work better than the
* usage of ImageIO and JAI. Sadly it works VERY slowly...
* @param tiffFile TIFF file.
* @param tmpDirectory Directory for the destination files.
* @return List of temporary PNG files.
* @throws IOException
*/
public static List<File> convertTiffFileToPngFiles(File tiffFile, File tmpDirectory) throws IOException {
tmpDirectory.mkdirs();
List<File> list = new ArrayList<File>();
RandomAccessFileOrArray ra = new RandomAccessFileOrArray(tiffFile.getCanonicalPath());
int pageCount = TiffImage.getNumberOfPages(ra);
for (int i = 0; i < pageCount; ++i) {
Image img = TiffImage.getTiffImage(ra, i + 1);
if (img != null) {
try {
// First - create a single PDF page from the tiff page.
Document document = new Document(PageSize.A4, 0.0f, 0.0f, 0.0f, 0.0f);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PdfWriter.getInstance(document, baos);
document.open();
document.add(img);
document.close();
// Second - read the memory based PDF file and read the image. Write
// this into PNG file.
PdfReader reader = new PdfReader(baos.toByteArray());
for (int j = 0; j < reader.getXrefSize(); j++) {
PdfObject pdfobj = reader.getPdfObject(j);
if (pdfobj != null) {
if (pdfobj.isStream()) {
PdfStream stream = (PdfStream) pdfobj;
PdfObject pdfsubtype = stream.get(PdfName.SUBTYPE);
if (pdfsubtype != null) {
if (pdfsubtype.toString().equals(PdfName.IMAGE.toString())) {
PdfImageObject image = new PdfImageObject((PRStream) stream);
BufferedImage bufferedImage = image.getBufferedImage();
if (bufferedImage != null) {
String pngName = IdUtils.getUniqueID() + ".png";
File pngFile = new File(tmpDirectory, pngName);
FileOutputStream out = new FileOutputStream(pngFile);
ImageIO.write(bufferedImage, "png", out);
out.close();
list.add(pngFile);
}
}
}
}
}
}
reader.close();
} catch (Exception exception) {
// Ignore - the page may be corrupt.
}
}
}
ra.close();
return list;
}
}