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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.
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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;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import org.apache.commons.imaging.common.BinaryConstant;
import org.apache.commons.imaging.common.BinaryFunctions;

public final class JpegConstants {
    public static final int MAX_SEGMENT_SIZE = 0xffff;

    public static final BinaryConstant JFIF0_SIGNATURE = new BinaryConstant(
            new byte[] { 0x4a, // J
                    0x46, // F
                    0x49, // I
                    0x46, // F
                    0x0, //
            });
    public static final BinaryConstant JFIF0_SIGNATURE_ALTERNATIVE = new BinaryConstant(
            new byte[] { 0x4a, // J
                    0x46, // F
                    0x49, // I
                    0x46, // F
                    0x20, //
            });

    public static final BinaryConstant EXIF_IDENTIFIER_CODE = new BinaryConstant(
            new byte[] { 0x45, // E
                    0x78, // x
                    0x69, // i
                    0x66, // f
            });

    public static final BinaryConstant XMP_IDENTIFIER = new BinaryConstant(
            new byte[] { 0x68, // h
                    0x74, // t
                    0x74, // t
                    0x70, // p
                    0x3A, // :
                    0x2F, // /
                    0x2F, // /
                    0x6E, // n
                    0x73, // s
                    0x2E, // .
                    0x61, // a
                    0x64, // d
                    0x6F, // o
                    0x62, // b
                    0x65, // e
                    0x2E, // .
                    0x63, // c
                    0x6F, // o
                    0x6D, // m
                    0x2F, // /
                    0x78, // x
                    0x61, // a
                    0x70, // p
                    0x2F, // /
                    0x31, // 1
                    0x2E, // .
                    0x30, // 0
                    0x2F, // /
                    0, // 0-terminated us-ascii string.
            });

    public static final BinaryConstant SOI = new BinaryConstant(new byte[] {
            (byte) 0xff, (byte) 0xd8 });
    public static final BinaryConstant EOI = new BinaryConstant(new byte[] {
            (byte) 0xff, (byte) 0xd9 });

    public static final int JPEG_APP0 = 0xE0;
    public static final int JPEG_APP0_MARKER = (0xff00) | (JPEG_APP0);
    public static final int JPEG_APP1_MARKER = (0xff00) | (JPEG_APP0 + 1);
    public static final int JPEG_APP2_MARKER = (0xff00) | (JPEG_APP0 + 2);
    public static final int JPEG_APP13_MARKER = (0xff00) | (JPEG_APP0 + 13);
    public static final int JPEG_APP14_MARKER = (0xff00) | (JPEG_APP0 + 14);
    public static final int JPEG_APP15_MARKER = (0xff00) | (JPEG_APP0 + 15);

    public static final int JFIF_MARKER = 0xFFE0;
    public static final int SOF0_MARKER = 0xFFc0;
    public static final int SOF1_MARKER = 0xFFc0 + 0x1;
    public static final int SOF2_MARKER = 0xFFc0 + 0x2;
    public static final int SOF3_MARKER = 0xFFc0 + 0x3;
    public static final int DHT_MARKER = 0xFFc0 + 0x4;
    public static final int SOF5_MARKER = 0xFFc0 + 0x5;
    public static final int SOF6_MARKER = 0xFFc0 + 0x6;
    public static final int SOF7_MARKER = 0xFFc0 + 0x7;
    public static final int SOF8_MARKER = 0xFFc0 + 0x8;
    public static final int SOF9_MARKER = 0xFFc0 + 0x9;
    public static final int SOF10_MARKER = 0xFFc0 + 0xa;
    public static final int SOF11_MARKER = 0xFFc0 + 0xb;
    public static final int DAC_MARKER = 0xFFc0 + 0xc;
    public static final int SOF13_MARKER = 0xFFc0 + 0xd;
    public static final int SOF14_MARKER = 0xFFc0 + 0xe;
    public static final int SOF15_MARKER = 0xFFc0 + 0xf;

    public static final int EOI_MARKER = 0xFFd9;
    public static final int SOS_MARKER = 0xFFda;
    public static final int DQT_MARKER = 0xFFdb;
    public static final int DNL_MARKER = 0xFFdc;
    public static final int COM_MARKER = 0xFFfe;

    public static final List MARKERS = Collections.unmodifiableList(Arrays.asList(
            JPEG_APP0, JPEG_APP0_MARKER,
            JPEG_APP1_MARKER, JPEG_APP2_MARKER, JPEG_APP13_MARKER,
            JPEG_APP14_MARKER, JPEG_APP15_MARKER, JFIF_MARKER,
            SOF0_MARKER, SOF1_MARKER, SOF2_MARKER, SOF3_MARKER, DHT_MARKER,
            SOF5_MARKER, SOF6_MARKER, SOF7_MARKER, SOF8_MARKER, SOF9_MARKER,
            SOF10_MARKER, SOF11_MARKER, DAC_MARKER, SOF13_MARKER,
            SOF14_MARKER, SOF15_MARKER, EOI_MARKER, SOS_MARKER, DQT_MARKER,
            DNL_MARKER, COM_MARKER));

    public static final BinaryConstant ICC_PROFILE_LABEL = new BinaryConstant(
            new byte[] { 0x49, 0x43, 0x43, 0x5F, 0x50, 0x52, 0x4F, 0x46, 0x49,
                    0x4C, 0x45, 0x0 });

    public static final BinaryConstant PHOTOSHOP_IDENTIFICATION_STRING = new BinaryConstant(
            new byte[] { 0x50, // P
                    0x68, // h
                    0x6F, // o
                    0x74, // t
                    0x6F, // o
                    0x73, // s
                    0x68, // h
                    0x6F, // o
                    0x70, // p
                    0x20, //
                    0x33, // 3
                    0x2E, // .
                    0x30, // 0
                    0, });
    public static final int CONST_8BIM = BinaryFunctions.charsToQuad('8', 'B', 'I', 'M');
    
    private JpegConstants() {
    }
}