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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.
*/
package org.apache.commons.imaging.formats.jpeg.segments;
import static org.apache.commons.imaging.common.BinaryFunctions.read2Bytes;
import static org.apache.commons.imaging.common.BinaryFunctions.readByte;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.imaging.formats.jpeg.JpegConstants;
public class SofnSegment extends Segment {
private static final Logger LOGGER = Logger.getLogger(SofnSegment.class.getName());
public final int width;
public final int height;
public final int numberOfComponents;
public final int precision;
private final Component[] components;
public static class Component {
public final int componentIdentifier;
public final int horizontalSamplingFactor;
public final int verticalSamplingFactor;
public final int quantTabDestSelector;
public Component(final int componentIdentifier, final int horizontalSamplingFactor,
final int veritcalSamplingFactor, final int quantTabDestSelector) {
this.componentIdentifier = componentIdentifier;
this.horizontalSamplingFactor = horizontalSamplingFactor;
this.verticalSamplingFactor = veritcalSamplingFactor;
this.quantTabDestSelector = quantTabDestSelector;
}
}
public SofnSegment(final int marker, final byte[] segmentData) throws IOException {
this(marker, segmentData.length, new ByteArrayInputStream(segmentData));
}
public SofnSegment(final int marker, final int markerLength, final InputStream is)
throws IOException {
super(marker, markerLength);
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("SOF0Segment marker_length: " + markerLength);
}
precision = readByte("Data_precision", is, "Not a Valid JPEG File");
height = read2Bytes("Image_height", is, "Not a Valid JPEG File", getByteOrder());
width = read2Bytes("Image_Width", is, "Not a Valid JPEG File", getByteOrder());
numberOfComponents = readByte("Number_of_components", is,
"Not a Valid JPEG File");
components = new Component[numberOfComponents];
for (int i = 0; i < numberOfComponents; i++) {
final int componentIdentifier = readByte("ComponentIdentifier", is,
"Not a Valid JPEG File");
final int hvSamplingFactors = readByte("SamplingFactors", is,
"Not a Valid JPEG File");
final int horizontalSamplingFactor = (hvSamplingFactors >> 4) & 0xf;
final int verticalSamplingFactor = hvSamplingFactors & 0xf;
final int quantTabDestSelector = readByte("QuantTabDestSel", is,
"Not a Valid JPEG File");
components[i] = new Component(componentIdentifier,
horizontalSamplingFactor, verticalSamplingFactor,
quantTabDestSelector);
}
}
/**
* Returns a copy of all the components.
* @return the components
*/
public Component[] getComponents() {
return components.clone();
}
/**
* Returns the component at the specified index.
* @param index the array index
* @return the component
*/
public Component getComponents(final int index) {
return components[index];
}
@Override
public String getDescription() {
return "SOFN (SOF" + (marker - JpegConstants.SOF0_MARKER) + ") ("
+ getSegmentType() + ")";
}
}