/*
 * 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.sanselan.formats.jpeg.segments;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.sanselan.ImageReadException;
import org.apache.sanselan.formats.jpeg.JpegImageParser;

public class SOFNSegment extends Segment
{
    public final int width, height;
    public final int numberOfComponents;
    public final int precision;

    public SOFNSegment(int marker, byte segmentData[])
            throws ImageReadException, IOException
    {
        this(marker, segmentData.length, new ByteArrayInputStream(segmentData));
    }

    public SOFNSegment(int marker, int marker_length, InputStream is)
            throws ImageReadException, IOException
    {
        super(marker, marker_length);

        if (getDebug())
            System.out.println("SOF0Segment marker_length: " + marker_length);

        {
            precision = readByte("Data_precision", is, "Not a Valid JPEG File");
            height = read2Bytes("Image_height", is, "Not a Valid JPEG File");
            width = read2Bytes("Image_Width", is, "Not a Valid JPEG File");
            numberOfComponents = readByte("Number_of_components", is,
                    "Not a Valid JPEG File");

            // ignore the rest of the segment for now...
            skipBytes(is, marker_length - 6,
                    "Not a Valid JPEG File: SOF0 Segment");

            //                int Each_component1 = read_byte("Each_component1", is,
            //                        "Not a Valid JPEG File");
            //                int Each_component2 = read_byte("Each_component2", is,
            //                        "Not a Valid JPEG File");
            //                int Each_component3 = read_byte("Each_component3", is,
            //                        "Not a Valid JPEG File");
        }

        if (getDebug())
            System.out.println("");
    }

    public String getDescription()
    {
        return "SOFN (SOF" + (marker - JpegImageParser.SOF0Marker) + ") ("
                + getSegmentType() + ")";
    }

}