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Apache Commons Imaging (previously Sanselan) is a pure-Java image library.
There is a newer version: 1.0.0-alpha5
/*
 * 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.internal;

import java.awt.color.ICC_Profile;
import java.io.File;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Internal-only debug class. Used for collecting extra information when parsing or
 * modifying images or metadata. These methods are useful for troubleshooting and
 * issue analysis, but this should not be used directly by end-users, nor extended
 * in any way. This may change or be removed at any time.
 */
public final class Debug {

    private static final Logger LOGGER = Logger.getLogger(Debug.class.getName());

    // public static String newline = System.getProperty("line.separator");
    private static final String NEWLINE = "\r\n";
    private static long counter;

    public static void debug(final String message) {
        if (LOGGER.isLoggable(Level.FINEST)) {
            LOGGER.finest(message);
        }
    }

    public static void debug() {
        if (LOGGER.isLoggable(Level.FINEST)) {
            LOGGER.finest(NEWLINE);
        }
    }

    private static String getDebug(final String message, final int[] v) {
        final StringBuilder result = new StringBuilder();

        if (v == null) {
            result.append(message + " (" + null + ")" + NEWLINE);
        } else {
            result.append(message + " (" + v.length + ")" + NEWLINE);
            for (final int element : v) {
                result.append("\t" + element + NEWLINE);
            }
            result.append(NEWLINE);
        }
        return result.toString();
    }

    private static String getDebug(final String message, final byte[] v) {
        final int max = 250;
        return getDebug(message, v, max);
    }

    private static String getDebug(final String message, final byte[] v, final int max) {

        final StringBuilder result = new StringBuilder();

        if (v == null) {
            result.append(message + " (" + null + ")" + NEWLINE);
        } else {
            result.append(message + " (" + v.length + ")" + NEWLINE);
            for (int i = 0; i < max && i < v.length; i++) {
                final int b = 0xff & v[i];

                char c;
                if (b == 0 || b == 10 || b == 11 || b == 13) {
                    c = ' ';
                } else {
                    c = (char) b;
                }

                result.append("\t" + i + ": " + b + " (" + c + ", 0x"
                        + Integer.toHexString(b) + ")" + NEWLINE);
            }
            if (v.length > max) {
                result.append("\t..." + NEWLINE);
            }

            result.append(NEWLINE);
        }
        return result.toString();
    }

    private static String getDebug(final String message, final char[] v) {
        final StringBuilder result = new StringBuilder();

        if (v == null) {
            result.append(message + " (" + null + ")" + NEWLINE);
        } else {
            result.append(message + " (" + v.length + ")" + NEWLINE);
            for (final char element : v) {
                result.append("\t" + element + " (" + (0xff & element) + ")" + NEWLINE);
            }
            result.append(NEWLINE);
        }
        return result.toString();
    }

    private static void debug(final String message, final Map map) {
        debug(getDebug(message, map));
    }

    private static String getDebug(final String message, final Map map) {
        final StringBuilder result = new StringBuilder();

        if (map == null) {
            return message + " map: " + null;
        }

        final List