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/*******************************************************************************
* Copyright (c) 2000, 2006 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.internal.image;
import java.io.*;
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
/**
* Abstract factory class for loading/unloading images from files or streams
* in various image file formats.
*
*/
public abstract class FileFormat {
static final String FORMAT_PACKAGE = "org.eclipse.swt.internal.image"; //$NON-NLS-1$
static final String FORMAT_SUFFIX = "FileFormat"; //$NON-NLS-1$
static final String[] FORMATS = {"WinBMP", "WinBMP", "GIF", "WinICO", "JPEG", "PNG", "TIFF", "OS2BMP"}; //$NON-NLS-1$//$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$//$NON-NLS-5$ //$NON-NLS-6$//$NON-NLS-7$//$NON-NLS-8$
LEDataInputStream inputStream;
LEDataOutputStream outputStream;
ImageLoader loader;
int compression;
/**
* Return whether or not the specified input stream
* represents a supported file format.
*/
abstract boolean isFileFormat(LEDataInputStream stream);
abstract ImageData[] loadFromByteStream();
/**
* Read the specified input stream, and return the
* device independent image array represented by the stream.
*/
public ImageData[] loadFromStream(LEDataInputStream stream) {
try {
inputStream = stream;
return loadFromByteStream();
} catch (Exception e) {
if (e instanceof IOException) {
SWT.error(SWT.ERROR_IO, e);
} else {
SWT.error(SWT.ERROR_INVALID_IMAGE, e);
}
return null;
}
}
/**
* Read the specified input stream using the specified loader, and
* return the device independent image array represented by the stream.
*/
public static ImageData[] load(InputStream is, ImageLoader loader) {
FileFormat fileFormat = null;
LEDataInputStream stream = new LEDataInputStream(is);
boolean isSupported = false;
for (int i = 1; i < FORMATS.length; i++) {
if (FORMATS[i] != null) {
try {
Class clazz = Class.forName(FORMAT_PACKAGE + '.' + FORMATS[i] + FORMAT_SUFFIX);
fileFormat = (FileFormat) clazz.newInstance();
if (fileFormat.isFileFormat(stream)) {
isSupported = true;
break;
}
} catch (ClassNotFoundException e) {
FORMATS[i] = null;
} catch (Exception e) {
}
}
}
if (!isSupported) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
fileFormat.loader = loader;
return fileFormat.loadFromStream(stream);
}
/**
* Write the device independent image array stored in the specified loader
* to the specified output stream using the specified file format.
*/
public static void save(OutputStream os, int format, ImageLoader loader) {
if (format < 0 || format >= FORMATS.length) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
if (FORMATS[format] == null) SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
if (loader.data == null || loader.data.length < 1) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
LEDataOutputStream stream = new LEDataOutputStream(os);
FileFormat fileFormat = null;
try {
Class clazz = Class.forName(FORMAT_PACKAGE + '.' + FORMATS[format] + FORMAT_SUFFIX);
fileFormat = (FileFormat) clazz.newInstance();
} catch (Exception e) {
SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
}
if (format == SWT.IMAGE_BMP_RLE) {
switch (loader.data[0].depth) {
case 8: fileFormat.compression = 1; break;
case 4: fileFormat.compression = 2; break;
}
}
fileFormat.unloadIntoStream(loader, stream);
}
abstract void unloadIntoByteStream(ImageLoader loader);
/**
* Write the device independent image array stored in the specified loader
* to the specified output stream.
*/
public void unloadIntoStream(ImageLoader loader, LEDataOutputStream stream) {
try {
outputStream = stream;
unloadIntoByteStream(loader);
outputStream.flush();
} catch (Exception e) {
try {outputStream.flush();} catch (Exception f) {}
SWT.error(SWT.ERROR_IO, e);
}
}
}
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