gt:         byte[] keywordBytes = getISO8859_1Bytes(keyword);
context: /* File: DasPNGEncoder.java
   * Copyright (C) 2002-2003 The University of Iowa
   * Created by: Jeremy Faden <jbf@space.physics.uiowa.edu>
   *             Jessica Swanner <jessica@space.physics.uiowa.edu>
   *             Edward E. West <eew@space.physics.uiowa.edu>
   *
   * This file is part of the das2 library.
   *
   * das2 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 2 of the License, or
   * (at your option) 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, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.das2.util;
  
  import java.awt.image.BufferedImage;
  import java.awt.image.IndexColorModel;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.nio.ByteBuffer;
  import java.util.*;
  import java.util.zip.CRC32;
  import java.util.zip.Deflater;
  
  /**
   *
   * @author  eew
   */
  public class DasPNGEncoder extends DasPNGConstants {
      
      
      /** Creates a new instance of DasPNGEncoder */
      public DasPNGEncoder() {
      }
      
      /** Adds a tEXT chunk with the specified keyword and content.
       * @param keyword the specified keyword
       * @param content the content for the tEXT chunk
       */
      public void addText(String keyword, String content) {
          List list = (List)textMap.get(keyword);
          if (list == null) {
              list = new ArrayList();
              textMap.put(keyword, list);
          }
          list.add(content);
      }
      
      /** Removes the tEXT chunk with the specified keyword and content.
       * @param keyword the specified keyword
       * @param content the specified content to be removed
       */
      public void removeText(String keyword, String content) {
          List list = (List)textMap.get(keyword);
          if (list != null) {
              list.remove(content);
          }
      }
      
      /** Removes all tEXT chunk with the specified keyword
       * @param keyword the specified keyword.
       */
      public void removeAllText(String keyword) {
          textMap.remove(keyword);
      }
      
      public void setGamma(int gamma) {
          this.gamma = gamma;
      }
      
      public void write(BufferedImage image, OutputStream out) throws IOException {
          LinkedList chunkList = new LinkedList();
          int totalSize = 0;
          chunkList.add(getHeaderBytes());
          chunkList.add(getIHDRBytes(image));
          gettEXtBytes(chunkList);
          chunkList.add(getgAMABytes());
          chunkList.add(getPLTEBytes(image));
          chunkList.add(getIDATBytes(image));
          chunkList.add(getIENDBytes());
          Iterator iterator = chunkList.iterator();
          while (iterator.hasNext()) {
              totalSize += ((byte[])iterator.next()).length;
          }
          ByteBuffer buffer = ByteBuffer.allocate(totalSize);
          iterator = chunkList.iterator();
          while (iterator.hasNext()) {
              buffer.put((byte[])iterator.next());
          }
          out.write(buffer.array());
      }
      
      private byte[] getHeaderBytes() {
          return new byte[] {
              (byte)137, (byte)80, (byte)78, (byte)71, 
              (byte)13, (byte)10, (byte)26, (byte)10
          };
      }
      
      /**
       * Width:              4 bytes
       * Height:             4 bytes
       * Bit depth:          1 byte (allowed values: 1, 2, 4, 8, 16)
       * Color type:         1 byte
             Color    Allowed    Interpretation
             Type    Bit Depths
             0       1,2,4,8,16  Each pixel is a grayscale sample.
             2       8,16        Each pixel is an R,G,B triple.
             3       1,2,4,8     Each pixel is a palette index;
                                 a PLTE chunk must appear.
             4       8,16        Each pixel is a grayscale sample,
                                 followed by an alpha sample.
             6       8,16        Each pixel is an R,G,B triple,
                                 followed by an alpha sample.
       * Compression method: 1 byte (must be 0)
       * Filter method:      1 byte (must be 0)
       * Interlace method:   1 byte (interlacing not supported, will be 0)
       */
      private byte[] getIHDRBytes(BufferedImage image) {
          byte bitDepth;
          byte colorType;
          int imageType = image.getType();
          switch (imageType) {
              //24 bit image types
              case BufferedImage.TYPE_3BYTE_BGR:
              case BufferedImage.TYPE_INT_BGR:
              case BufferedImage.TYPE_INT_RGB:
              case BufferedImage.TYPE_USHORT_555_RGB:
              case BufferedImage.TYPE_USHORT_565_RGB:
                  bitDepth = 8;
                  colorType = 2;
                  break;
                  
              //32 bit alpha
              case BufferedImage.TYPE_4BYTE_ABGR:
              case BufferedImage.TYPE_INT_ARGB:
                  bitDepth = 8;
                  colorType = 6;
                  break;
                  
              case BufferedImage.TYPE_BYTE_INDEXED:
                  bitDepth = 8;
                  colorType = 3;
                  break;
                  
              case BufferedImage.TYPE_BYTE_GRAY:
                  bitDepth = 8;
                  colorType = 0;
                  break;
                  
              case BufferedImage.TYPE_USHORT_GRAY:
                  bitDepth = 16;
                  colorType = 0;
                  break;
                  
              //Currently unsupported types
              case BufferedImage.TYPE_BYTE_BINARY:
              case BufferedImage.TYPE_4BYTE_ABGR_PRE:
              case BufferedImage.TYPE_INT_ARGB_PRE:
              case BufferedImage.TYPE_CUSTOM:
              default:
                  throw new RuntimeException("Unsupported image type");
          }
          byte compressionMethod = 0;
          byte filterMethod = 0;
          byte interlaceMethod = 0;
          
          byte[] array = new byte[25];
          ByteBuffer buffer = ByteBuffer.wrap(array);
          buffer.putInt(13);
          buffer.put(getISO8859_1Bytes(CHUNK_TYPE_IHDR));
          buffer.putInt(image.getWidth());
          buffer.putInt(image.getHeight());
          buffer.put(bitDepth);
          buffer.put(colorType);
          buffer.put(compressionMethod);
          buffer.put(filterMethod);
          buffer.put(interlaceMethod);
          CRC32 crc = new CRC32();
          crc.update(array, 4, 17);
          buffer.putInt((int)crc.getValue());
          return array;
      }
      
      private byte[] getgAMABytes() {
          byte[] array = new byte[16];
          ByteBuffer buffer = ByteBuffer.wrap(array);
          buffer.putInt(4);
          buffer.put(getISO8859_1Bytes(CHUNK_TYPE_gAMA));
          buffer.putInt(gamma);
          CRC32 crc = new CRC32();
          crc.update(array, 4, 8);
          buffer.putInt((int)crc.getValue());
          return array;
      }
      
      private byte[] getPLTEBytes(BufferedImage image) {
          if (image.getType() != BufferedImage.TYPE_BYTE_INDEXED) {
              return new byte[0];
          }
          //IndexColorModel cm = (IndexColorModel)image.getColorModel();
          //int colorCount = cm.getMapSize();
          throw new UnsupportedOperationException();
      }
      
      private byte[] getIDATBytes(BufferedImage image) {
          byte[] imageData;
          int imageType = image.getType();
          switch (imageType) {
              case BufferedImage.TYPE_3BYTE_BGR:
              case BufferedImage.TYPE_INT_BGR:
              case BufferedImage.TYPE_INT_RGB:
              case BufferedImage.TYPE_USHORT_555_RGB:
              case BufferedImage.TYPE_USHORT_565_RGB:
                  imageData = getRGBBytes(image);
                  break;
                  
              //32 bit alpha
              case BufferedImage.TYPE_4BYTE_ABGR:
                  throw new UnsupportedOperationException("ABGR mode not supported");
              case BufferedImage.TYPE_INT_ARGB:
                  throw new UnsupportedOperationException("ARGB mode not supported");
              case BufferedImage.TYPE_BYTE_INDEXED:
              case BufferedImage.TYPE_BYTE_GRAY:
                  throw new UnsupportedOperationException("8 bit mode not supported");
                  
              case BufferedImage.TYPE_USHORT_GRAY:
                  throw new UnsupportedOperationException("16bit mode not supported");
                  
              //Currently unsupported types
              case BufferedImage.TYPE_BYTE_BINARY:
              case BufferedImage.TYPE_4BYTE_ABGR_PRE:
              case BufferedImage.TYPE_INT_ARGB_PRE:
              case BufferedImage.TYPE_CUSTOM:
              default:
                  throw new RuntimeException("Unsupported image type");
          }
          
          byte[] compressedImageData = new byte[imageData.length];
          Deflater deflater = new Deflater();
          deflater.setInput(imageData);
          deflater.finish();
          int compressedSize = deflater.deflate(compressedImageData);
          
          byte[] array = new byte[compressedSize + 12];
          ByteBuffer buffer = ByteBuffer.wrap(array);
          buffer.putInt(compressedSize);
          buffer.put(getISO8859_1Bytes(CHUNK_TYPE_IDAT));
          buffer.put(compressedImageData, 0, compressedSize);
          CRC32 crc = new CRC32();
          crc.update(array, 4, compressedSize + 4);
          buffer.putInt((int)crc.getValue());
          return array;
      }
      
      private byte[] getRGBBytes(BufferedImage image) {
          int width = image.getWidth();
          int height = image.getHeight();
          int[] intPixels = new int[width * height];
          image.getRGB(0, 0, width, height, intPixels, 0, width);
          byte[] bytePixels = new byte[intPixels.length * 3 + height];
          
          for (int line = 0; line < height; line++) {
              int offset = (width * 3 + 1) * line;
              bytePixels[offset] = (byte)0;
              for (int pixel = 0; pixel < width; pixel++) {
                  int intIndex = line * width + pixel;
                  int byteIndex = offset + (pixel * 3 + 1);
                  bytePixels[byteIndex] = (byte)((0xFF0000 & intPixels[intIndex]) >> 16);
                  bytePixels[byteIndex + 1] = (byte)((0x00FF00 & intPixels[intIndex]) >> 8);
                  bytePixels[byteIndex + 2] = (byte)(0x0000FF & intPixels[intIndex]);
              }
          }
          return bytePixels;
      }
      
  //    private byte[] getARGBBytes(BufferedImage image) {
  //        throw new UnsupportedOperationException("ARGB mode not supported");
  //    }
  //    
  //    private byte[] getABGRBytes(BufferedImage image) {
  //        throw new UnsupportedOperationException("ABGR mode not supported");
  //    }
  //    
  //    private byte[] get8BitSampleBytes(BufferedImage image) {
  //        throw new UnsupportedOperationException("8 bit mode not supported");
  //    }
  //    
  //    private byte[] get16BitSampleBytes(BufferedImage image) {
  //        throw new UnsupportedOperationException("16bit mode not supported");
  //    }
  //    
      private byte[] getIENDBytes() {
          byte[] array = new byte[12];
          byte[] typeBytes = getISO8859_1Bytes(CHUNK_TYPE_IEND);
          ByteBuffer buffer = ByteBuffer.wrap(array);
          buffer.putInt(0);
          buffer.put(typeBytes);
          CRC32 crc = new CRC32();
          crc.update(typeBytes);
          buffer.putInt((int)crc.getValue());
          return array;
      }
      
      private void gettEXtBytes(List list) {
          Iterator entries = textMap.entrySet().iterator();
          while (entries.hasNext()) {
              Map.Entry entry = (Map.Entry)entries.next();
              List contentList = (List)entry.getValue();
              Iterator content = contentList.iterator();
              while (content.hasNext()) {
                  list.add(gettEXtBytes((String)entry.getKey(), (String)content.next()));
              }
          }
      }
      
      private byte[] gettEXtBytes(String keyword, String content) {
  