/*
* Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
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package com.sun.imageio.plugins.wbmp;
import java.util.Locale;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.spi.IIORegistry;
import javax.imageio.spi.ServiceRegistry;
import java.io.IOException;
import javax.imageio.ImageReader;
import javax.imageio.IIOException;
import com.sun.imageio.plugins.common.ReaderUtil;
public class WBMPImageReaderSpi extends ImageReaderSpi {
private static final int MAX_WBMP_WIDTH = 1024;
private static final int MAX_WBMP_HEIGHT = 768;
private static String [] writerSpiNames =
{"com.sun.imageio.plugins.wbmp.WBMPImageWriterSpi"};
private static String[] formatNames = {"wbmp", "WBMP"};
private static String[] entensions = {"wbmp"};
private static String[] mimeType = {"image/vnd.wap.wbmp"};
private boolean registered = false;
public WBMPImageReaderSpi() {
super("Oracle Corporation",
"1.0",
formatNames,
entensions,
mimeType,
"com.sun.imageio.plugins.wbmp.WBMPImageReader",
new Class[] { ImageInputStream.class },
writerSpiNames,
true,
null, null, null, null,
true,
WBMPMetadata.nativeMetadataFormatName,
"com.sun.imageio.plugins.wbmp.WBMPMetadataFormat",
null, null);
}
public void onRegistration(ServiceRegistry registry,
Class<?> category) {
if (registered) {
return;
}
registered = true;
}
public String getDescription(Locale locale) {
return "Standard WBMP Image Reader";
}
public boolean canDecodeInput(Object source) throws IOException {
if (!(source instanceof ImageInputStream)) {
return false;
}
ImageInputStream stream = (ImageInputStream)source;
stream.mark();
int type = stream.readByte(); // TypeField
int fixHeaderField = stream.readByte();
// check WBMP "header"
if (type != 0 || fixHeaderField != 0) {
// while WBMP reader does not support ext WBMP headers
stream.reset();
return false;
}
int width = ReaderUtil.readMultiByteInteger(stream);
int height = ReaderUtil.readMultiByteInteger(stream);
// check image dimension
if (width <= 0 || height <= 0) {
stream.reset();
return false;
}
long dataLength = stream.length();
if (dataLength == -1) {
// We can't verify that amount of data in the stream
// corresponds to image dimension because we do not know
// the length of the data stream.
// Assuming that wbmp image are used for mobile devices,
// let's introduce an upper limit for image dimension.
// In case if exact amount of raster data is unknown,
// let's reject images with dimension above the limit.
stream.reset();
return (width < MAX_WBMP_WIDTH) && (height < MAX_WBMP_HEIGHT);
}
dataLength -= stream.getStreamPosition();
stream.reset();
long scanSize = (width / 8) + ((width % 8) == 0 ? 0 : 1);
return (dataLength == scanSize * height);
}
public ImageReader createReaderInstance(Object extension)
throws IIOException {
return new WBMPImageReader(this);
}
}