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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.readByte;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
public class SosSegment extends Segment {
private static final Logger LOGGER = Logger.getLogger(SosSegment.class.getName());
public final int numberOfComponents;
private final Component[] components;
public final int startOfSpectralSelection;
public final int endOfSpectralSelection;
public final int successiveApproximationBitHigh;
public final int successiveApproximationBitLow;
public static class Component {
public final int scanComponentSelector;
public final int dcCodingTableSelector;
public final int acCodingTableSelector;
public Component(final int scanComponentSelector, final int dcCodingTableSelector,
final int acCodingTableSelector) {
this.scanComponentSelector = scanComponentSelector;
this.dcCodingTableSelector = dcCodingTableSelector;
this.acCodingTableSelector = acCodingTableSelector;
}
}
public SosSegment(final int marker, final byte[] segmentData) throws IOException {
this(marker, segmentData.length, new ByteArrayInputStream(segmentData));
}
public SosSegment(final int marker, final int markerLength, final InputStream is) throws IOException {
super(marker, markerLength);
if (LOGGER.isLoggable(Level.FINEST)) {
LOGGER.finest("SosSegment marker_length: " + markerLength);
}
// Debug.debug("SOS", marker_length);
numberOfComponents = readByte("number_of_components_in_scan", is,
"Not a Valid JPEG File");
// Debug.debug("number_of_components_in_scan",
// numberOfComponents);
components = new Component[numberOfComponents];
for (int i = 0; i < numberOfComponents; i++) {
final int scanComponentSelector = readByte("scanComponentSelector", is, "Not a Valid JPEG File");
// Debug.debug("scanComponentSelector", scanComponentSelector);
final int acDcEntropoyCodingTableSelector = readByte(
"acDcEntropoyCodingTableSelector", is,
"Not a Valid JPEG File");
// Debug.debug("ac_dc_entrooy_coding_table_selector",
// acDcEntropoyCodingTableSelector);
final int dcCodingTableSelector = (acDcEntropoyCodingTableSelector >> 4) & 0xf;
final int acCodingTableSelector = acDcEntropoyCodingTableSelector & 0xf;
components[i] = new Component(scanComponentSelector,
dcCodingTableSelector, acCodingTableSelector);
}
startOfSpectralSelection = readByte("start_of_spectral_selection", is,
"Not a Valid JPEG File");
// Debug.debug("start_of_spectral_selection", startOfSpectralSelection);
endOfSpectralSelection = readByte("end_of_spectral_selection", is,
"Not a Valid JPEG File");
// Debug.debug("end_of_spectral_selection", endOfSpectralSelection);
final int successiveApproximationBitPosition = readByte(
"successive_approximation_bit_position", is,
"Not a Valid JPEG File");
// Debug.debug("successive_approximation_bit_position",
// successive_approximation_bit_position);
successiveApproximationBitHigh = (successiveApproximationBitPosition >> 4) & 0xf;
successiveApproximationBitLow = successiveApproximationBitPosition & 0xf;
}
/**
* Returns a copy of all the components.
* @return all the components
*/
public Component[] getComponents() {
return components.clone();
}
/**
* Return a component at the specified index.
* @param index the component index
* @return the component
*/
public Component getComponents(final int index) {
return components[index];
}
@Override
public String getDescription() {
return "SOS (" + getSegmentType() + ")";
}
}