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/*******************************************************************************
* Copyright (c) 2000, 2005 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 org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import java.io.*;
/**
* Baseline TIFF decoder revision 6.0
* Extension T4-encoding CCITT T.4 1D
*/
final class TIFFFileFormat extends FileFormat {
boolean isFileFormat(LEDataInputStream stream) {
try {
byte[] header = new byte[4];
stream.read(header);
stream.unread(header);
if (header[0] != header[1]) return false;
if (!(header[0] == 0x49 && header[2] == 42 && header[3] == 0) &&
!(header[0] == 0x4d && header[2] == 0 && header[3] == 42)) {
return false;
}
return true;
} catch (Exception e) {
return false;
}
}
ImageData[] loadFromByteStream() {
byte[] header = new byte[8];
boolean isLittleEndian;
ImageData[] images = new ImageData[0];
TIFFRandomFileAccess file = new TIFFRandomFileAccess(inputStream);
try {
file.read(header);
if (header[0] != header[1]) SWT.error(SWT.ERROR_INVALID_IMAGE);
if (!(header[0] == 0x49 && header[2] == 42 && header[3] == 0) &&
!(header[0] == 0x4d && header[2] == 0 && header[3] == 42)) {
SWT.error(SWT.ERROR_INVALID_IMAGE);
}
isLittleEndian = header[0] == 0x49;
int offset = isLittleEndian ?
(header[4] & 0xFF) | ((header[5] & 0xFF) << 8) | ((header[6] & 0xFF) << 16) | ((header[7] & 0xFF) << 24) :
(header[7] & 0xFF) | ((header[6] & 0xFF) << 8) | ((header[5] & 0xFF) << 16) | ((header[4] & 0xFF) << 24);
file.seek(offset);
TIFFDirectory directory = new TIFFDirectory(file, isLittleEndian, loader);
ImageData image = directory.read();
/* A baseline reader is only expected to read the first directory */
images = new ImageData[] {image};
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
return images;
}
void unloadIntoByteStream(ImageLoader loader) {
/* We do not currently support writing multi-page tiff,
* so we use the first image data in the loader's array. */
ImageData image = loader.data[0];
TIFFDirectory directory = new TIFFDirectory(image);
try {
directory.writeToStream(outputStream);
} catch (IOException e) {
SWT.error(SWT.ERROR_IO, e);
}
}
}
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