/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.sanselan.formats.pnm;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import org.apache.sanselan.ImageFormat;
import org.apache.sanselan.ImageInfo;
import org.apache.sanselan.ImageParser;
import org.apache.sanselan.ImageReadException;
import org.apache.sanselan.ImageWriteException;
import org.apache.sanselan.common.IImageMetadata;
import org.apache.sanselan.common.byteSources.ByteSource;
import org.apache.sanselan.util.Debug;
import com.google.code.appengine.awt.Dimension;
import com.google.code.appengine.awt.image.BufferedImage;
public class PNMImageParser extends ImageParser implements PNMConstants
{
public PNMImageParser()
{
super.setByteOrder(BYTE_ORDER_LSB);
// setDebug(true);
}
public String getName()
{
return "Pbm-Custom";
}
public String getDefaultExtension()
{
return DEFAULT_EXTENSION;
}
private static final String DEFAULT_EXTENSION = ".pnm";
private static final String ACCEPTED_EXTENSIONS[] = { ".pbm", ".pgm",
".ppm", ".pnm", };
protected String[] getAcceptedExtensions()
{
return ACCEPTED_EXTENSIONS;
}
protected ImageFormat[] getAcceptedTypes()
{
return new ImageFormat[] { ImageFormat.IMAGE_FORMAT_PBM, //
ImageFormat.IMAGE_FORMAT_PGM, //
ImageFormat.IMAGE_FORMAT_PPM, //
ImageFormat.IMAGE_FORMAT_PNM, };
}
private FileInfo readHeader(InputStream is) throws ImageReadException,
IOException
{
byte identifier1 = readByte("Identifier1", is, "Not a Valid PNM File");
byte identifier2 = readByte("Identifier2", is, "Not a Valid PNM File");
WhiteSpaceReader wsr = new WhiteSpaceReader(is);
int width = Integer.parseInt(wsr.readtoWhiteSpace());
int height = Integer.parseInt(wsr.readtoWhiteSpace());
// System.out.println("width: " + width);
// System.out.println("height: " + height);
// System.out.println("width*height: " + width * height);
// System.out.println("3*width*height: " + 3 * width * height);
// System.out.println("((width*height+7)/8): "
// + ((width * height + 7) / 8));
if (identifier1 != PNM_PREFIX_BYTE)
throw new ImageReadException("PNM file has invalid header.");
if (identifier2 == PBM_TEXT_CODE)
return new PBMFileInfo(width, height, false);
else if (identifier2 == PBM_RAW_CODE)
return new PBMFileInfo(width, height, true);
else if (identifier2 == PGM_TEXT_CODE)
{
int maxgray = Integer.parseInt(wsr.readtoWhiteSpace());
return new PGMFileInfo(width, height, false, maxgray);
} else if (identifier2 == PGM_RAW_CODE)
{
int maxgray = Integer.parseInt(wsr.readtoWhiteSpace());
return new PGMFileInfo(width, height, true, maxgray);
} else if (identifier2 == PPM_TEXT_CODE)
{
int max = Integer.parseInt(wsr.readtoWhiteSpace());
return new PPMFileInfo(width, height, false, max);
} else if (identifier2 == PPM_RAW_CODE)
{
int max = Integer.parseInt(wsr.readtoWhiteSpace());
// System.out.println("max: " + max);
return new PPMFileInfo(width, height, true, max);
} else
throw new ImageReadException("PNM file has invalid header.");
}
private FileInfo readHeader(ByteSource byteSource)
throws ImageReadException, IOException
{
InputStream is = null;
try
{
is = byteSource.getInputStream();
return readHeader(is);
} finally
{
try
{
if (is != null) {
is.close();
}
} catch (Exception e)
{
Debug.debug(e);
}
}
}
public byte[] getICCProfileBytes(ByteSource byteSource, Map params)
throws ImageReadException, IOException
{
return null;
}
public Dimension getImageSize(ByteSource byteSource, Map params)
throws ImageReadException, IOException
{
FileInfo info = readHeader(byteSource);
if (info == null)
throw new ImageReadException("PNM: Couldn't read Header");
return new Dimension(info.width, info.height);
}
public byte[] embedICCProfile(byte image[], byte profile[])
{
return null;
}
public boolean embedICCProfile(File src, File dst, byte profile[])
{
return false;
}
public IImageMetadata getMetadata(ByteSource byteSource, Map params)
throws ImageReadException, IOException
{
return null;
}
public ImageInfo getImageInfo(ByteSource byteSource, Map params)
throws ImageReadException, IOException
{
FileInfo info = readHeader(byteSource);
if (info == null)
throw new ImageReadException("PNM: Couldn't read Header");
ArrayList Comments = new ArrayList();
int BitsPerPixel = info.getBitDepth() * info.getNumComponents();
ImageFormat Format = info.getImageType();
String FormatName = info.getImageTypeDescription();
String MimeType = info.getMIMEType();
int NumberOfImages = 1;
boolean isProgressive = false;
// boolean isProgressive = (fPNGChunkIHDR.InterlaceMethod != 0);
//
int PhysicalWidthDpi = 72;
float PhysicalWidthInch = (float) ((double) info.width / (double) PhysicalWidthDpi);
int PhysicalHeightDpi = 72;
float PhysicalHeightInch = (float) ((double) info.height / (double) PhysicalHeightDpi);
String FormatDetails = info.getImageTypeDescription();
boolean isTransparent = false;
boolean usesPalette = false;
int ColorType = info.getColorType();
String compressionAlgorithm = ImageInfo.COMPRESSION_ALGORITHM_NONE;
ImageInfo result = new ImageInfo(FormatDetails, BitsPerPixel, Comments,
Format, FormatName, info.height, MimeType, NumberOfImages,
PhysicalHeightDpi, PhysicalHeightInch, PhysicalWidthDpi,
PhysicalWidthInch, info.width, isProgressive, isTransparent,
usesPalette, ColorType, compressionAlgorithm);
return result;
}
public boolean dumpImageFile(PrintWriter pw, ByteSource byteSource)
throws ImageReadException, IOException
{
pw.println("pnm.dumpImageFile");
{
ImageInfo imageData = getImageInfo(byteSource);
if (imageData == null)
return false;
imageData.toString(pw, "");
}
pw.println("");
return true;
}
private int[] getColorTable(byte bytes[]) throws ImageReadException,
IOException
{
if ((bytes.length % 3) != 0)
throw new ImageReadException("Bad Color Table Length: "
+ bytes.length);
int length = bytes.length / 3;
int result[] = new int[length];
for (int i = 0; i < length; i++)
{
int red = 0xff & bytes[(i * 3) + 0];
int green = 0xff & bytes[(i * 3) + 1];
int blue = 0xff & bytes[(i * 3) + 2];
int alpha = 0xff;
int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
result[i] = rgb;
}
return result;
}
public BufferedImage getBufferedImage(ByteSource byteSource, Map params)
throws ImageReadException, IOException
{
InputStream is = null;
try
{
is = byteSource.getInputStream();
FileInfo info = readHeader(is);
int width = info.width;
int height = info.height;
boolean hasAlpha = false;
BufferedImage result = getBufferedImageFactory(params)
.getColorBufferedImage(width, height, hasAlpha);
info.readImage(result, is);
return result;
} finally
{
try
{
if (is != null) {
is.close();
}
} catch (Exception e)
{
Debug.debug(e);
}
}
}
public static final String PARAM_KEY_PNM_RAWBITS = "PNM_RAWBITS";
public static final String PARAM_VALUE_PNM_RAWBITS_YES = "YES";
public static final String PARAM_VALUE_PNM_RAWBITS_NO = "NO";
public void writeImage(BufferedImage src, OutputStream os, Map params)
throws ImageWriteException, IOException
{
PNMWriter writer = null;
boolean useRawbits = true;
if (params != null)
{
Object useRawbitsParam = params.get(PARAM_KEY_PNM_RAWBITS);
if (useRawbitsParam != null)
{
if (useRawbitsParam.equals(PARAM_VALUE_PNM_RAWBITS_NO))
useRawbits = false;
}
Object subtype = params.get(PARAM_KEY_FORMAT);
if (subtype != null)
{
if (subtype.equals(ImageFormat.IMAGE_FORMAT_PBM))
writer = new PBMWriter(useRawbits);
else if (subtype.equals(ImageFormat.IMAGE_FORMAT_PGM))
writer = new PGMWriter(useRawbits);
else if (subtype.equals(ImageFormat.IMAGE_FORMAT_PPM))
writer = new PPMWriter(useRawbits);
}
}
if (writer == null)
writer = new PPMWriter(useRawbits);
// make copy of params; we'll clear keys as we consume them.
params = new HashMap(params);
// clear format key.
if (params.containsKey(PARAM_KEY_FORMAT))
params.remove(PARAM_KEY_FORMAT);
if (params.size() > 0)
{
Object firstKey = params.keySet().iterator().next();
throw new ImageWriteException("Unknown parameter: " + firstKey);
}
writer.writeImage(src, os, params);
}
/**
* Extracts embedded XML metadata as XML string.
* <p>
*
* @param byteSource
* File containing image data.
* @param params
* Map of optional parameters, defined in SanselanConstants.
* @return Xmp Xml as String, if present. Otherwise, returns null.
*/
public String getXmpXml(ByteSource byteSource, Map params)
throws ImageReadException, IOException
{
return null;
}
}