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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.image.analyser;
// Java
import java.io.InputStream;
import java.io.IOException;
// FOP
import org.apache.fop.image.FopImage;
import org.apache.fop.apps.FOUserAgent;
/**
* ImageReader object for EMF image type.
*
* @author Peter Herweg
*/
public class EMFReader implements ImageReader {
/** Length of the EMF header */
protected static final int EMF_SIG_LENGTH = 88;
/** offset to signature */
private static final int SIGNATURE_OFFSET = 40;
/** offset to width */
private static final int WIDTH_OFFSET = 32;
/** offset to height */
private static final int HEIGHT_OFFSET = 36;
/** offset to horizontal resolution in pixel */
private static final int HRES_PIXEL_OFFSET = 72;
/** offset to vertical resolution in pixel */
private static final int VRES_PIXEL_OFFSET = 76;
/** offset to horizontal resolution in mm */
private static final int HRES_MM_OFFSET = 80;
/** offset to vertical resolution in mm */
private static final int VRES_MM_OFFSET = 84;
/** @see org.apache.fop.image.analyser.ImageReader */
public FopImage.ImageInfo verifySignature(String uri, InputStream bis,
FOUserAgent ua) throws IOException {
byte[] header = getDefaultHeader(bis);
boolean supported
= ( (header[SIGNATURE_OFFSET + 0] == (byte) 0x20)
&& (header[SIGNATURE_OFFSET + 1] == (byte) 0x45)
&& (header[SIGNATURE_OFFSET + 2] == (byte) 0x4D)
&& (header[SIGNATURE_OFFSET + 3] == (byte) 0x46) );
if (supported) {
FopImage.ImageInfo info = getDimension(header);
info.originalURI = uri;
info.mimeType = getMimeType();
info.inputStream = bis;
return info;
} else {
return null;
}
}
/**
* Returns the MIME type supported by this implementation.
*
* @return The MIME type
*/
public String getMimeType() {
return "image/emf";
}
private FopImage.ImageInfo getDimension(byte[] header) {
FopImage.ImageInfo info = new FopImage.ImageInfo();
long value = 0;
int byte1;
int byte2;
int byte3;
int byte4;
// little endian notation
//resolution
byte1 = header[HRES_MM_OFFSET] & 0xff;
byte2 = header[HRES_MM_OFFSET + 1] & 0xff;
byte3 = header[HRES_MM_OFFSET + 2] & 0xff;
byte4 = header[HRES_MM_OFFSET + 3] & 0xff;
long hresMM = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
byte1 = header[VRES_MM_OFFSET] & 0xff;
byte2 = header[VRES_MM_OFFSET + 1] & 0xff;
byte3 = header[VRES_MM_OFFSET + 2] & 0xff;
byte4 = header[VRES_MM_OFFSET + 3] & 0xff;
long vresMM = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
byte1 = header[HRES_PIXEL_OFFSET] & 0xff;
byte2 = header[HRES_PIXEL_OFFSET + 1] & 0xff;
byte3 = header[HRES_PIXEL_OFFSET + 2] & 0xff;
byte4 = header[HRES_PIXEL_OFFSET + 3] & 0xff;
long hresPixel = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
byte1 = header[VRES_PIXEL_OFFSET] & 0xff;
byte2 = header[VRES_PIXEL_OFFSET + 1] & 0xff;
byte3 = header[VRES_PIXEL_OFFSET + 2] & 0xff;
byte4 = header[VRES_PIXEL_OFFSET + 3] & 0xff;
long vresPixel = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
info.dpiHorizontal = hresPixel / (hresMM / 25.4f);
info.dpiVertical = vresPixel / (vresMM / 25.4f);
//width
byte1 = header[WIDTH_OFFSET] & 0xff;
byte2 = header[WIDTH_OFFSET + 1] & 0xff;
byte3 = header[WIDTH_OFFSET + 2] & 0xff;
byte4 = header[WIDTH_OFFSET + 3] & 0xff;
value = (long) ((byte4 << 24) | (byte3 << 16)
| (byte2 << 8) | byte1);
value = Math.round(value / 100f / 25.4f * info.dpiHorizontal);
info.width = (int) (value & 0xffffffff);
//height
byte1 = header[HEIGHT_OFFSET] & 0xff;
byte2 = header[HEIGHT_OFFSET + 1] & 0xff;
byte3 = header[HEIGHT_OFFSET + 2] & 0xff;
byte4 = header[HEIGHT_OFFSET + 3] & 0xff;
value = (long) ((byte4 << 24) | (byte3 << 16) | (byte2 << 8) | byte1);
value = Math.round(value / 100f / 25.4f * info.dpiVertical);
info.height = (int) (value & 0xffffffff);
return info;
}
private byte[] getDefaultHeader(InputStream imageStream)
throws IOException {
byte[] header = new byte[EMF_SIG_LENGTH];
try {
imageStream.mark(EMF_SIG_LENGTH + 1);
imageStream.read(header);
imageStream.reset();
} catch (IOException ex) {
try {
imageStream.reset();
} catch (IOException exbis) {
// throw the original exception, not this one
}
throw ex;
}
return header;
}
}
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