    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.common;
    018
    019import java.io.IOException;
    020import java.io.PrintWriter;
    021import java.io.StringWriter;
    022import java.nio.ByteOrder;
    023import java.util.logging.Level;
    024import java.util.logging.Logger;
    025
    026public class BinaryFileParser {
    027
    028    private static final Logger LOGGER = Logger.getLogger(BinaryFileParser.class.getName());
    029
    030    // default byte order for Java, many file formats.
    031    private ByteOrder byteOrder = ByteOrder.BIG_ENDIAN;
    032
    033    public BinaryFileParser(final ByteOrder byteOrder) {
    034        this.byteOrder = byteOrder;
    035    }
    036
    037    /**
    038     * Constructs a BinaryFileParser with the default, big-endian, byte order.
    039     */
    040    public BinaryFileParser() {
    041        // as above
    042    }
    043
    044    protected void setByteOrder(final ByteOrder byteOrder) {
    045        this.byteOrder = byteOrder;
    046    }
    047
    048    public ByteOrder getByteOrder() {
    049        return byteOrder;
    050    }
    051
    052    protected final void debugNumber(final String msg, final int data, final int bytes) {
    053        try (StringWriter sw = new StringWriter(); PrintWriter pw = new PrintWriter(sw)) {
    054            debugNumber(pw, msg, data, bytes);
    055            pw.flush();
    056            sw.flush();
    057            LOGGER.fine(sw.toString());
    058        } catch (final IOException e) {
    059            LOGGER.log(Level.SEVERE, e.getMessage(), e);
    060        }
    061    }
    062
    063    protected final void debugNumber(final PrintWriter pw, final String msg, final int data, final int bytes) {
    064        pw.print(msg + ": " + data + " (");
    065        int byteData = data;
    066        for (int i = 0; i < bytes; i++) {
    067            if (i > 0) {
    068                pw.print(",");
    069            }
    070            final int singleByte = 0xff & byteData;
    071            pw.print((char) singleByte + " [" + singleByte + "]");
    072            byteData >>= 8;
    073        }
    074        pw.println(") [0x" + Integer.toHexString(data) + ", " + Integer.toBinaryString(data) + "]");
    075        pw.flush();
    076    }
    077}