    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.imaging.formats.png;
    018
    019import java.nio.charset.StandardCharsets;
    020
    021import org.apache.commons.imaging.common.BinaryFunctions;
    022
    023/**
    024 * Type of a PNG chunk.
    025 *
    026 * @see <a href="http://www.w3.org/TR/PNG/#11Chunks">Portable Network Graphics Specification - Chunk specifications</a>
    027 */
    028public enum ChunkType {
    029
    030    /** Image header */
    031    IHDR,
    032
    033    /** Palette */
    034    PLTE,
    035
    036    /** Image data */
    037    IDAT,
    038
    039    /** Image trailer */
    040    IEND,
    041
    042    /** Transparency */
    043    tRNS,
    044
    045    /** Primary chromaticities and white point */
    046    cHRM,
    047
    048    /** Image gamma */
    049    gAMA,
    050
    051    /** Embedded ICC profile */
    052    iCCP,
    053
    054    /** Significant bits*/
    055    sBIT,
    056
    057    /** Standard RGB colour space */
    058    sRGB,
    059
    060    /** Textual data */
    061    tEXt,
    062
    063    /** Compressed textual data */
    064    zTXt,
    065
    066    /** International textual data */
    067    iTXt,
    068
    069    /** Background colour */
    070    bKGD,
    071
    072    /** Image histogram */
    073    hIST,
    074
    075    /** Physical pixel dimensions */
    076    pHYs,
    077
    078    /** Physical scale */
    079    sCAL,
    080
    081    /** Suggested palette */
    082    sPLT,
    083
    084    /** Image last-modification time */
    085    tIME;
    086
    087    final byte[] array;
    088    final int value;
    089
    090    ChunkType() {
    091        final char[] chars = name().toCharArray();
    092        array = name().getBytes(StandardCharsets.UTF_8);
    093        value = BinaryFunctions.charsToQuad(chars[0], chars[1], chars[2], chars[3]);
    094    }
    095}