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.tiff.write;
018
019import static org.apache.commons.imaging.formats.tiff.constants.TiffConstants.TIFF_HEADER_SIZE;
020
021import java.io.IOException;
022import java.io.OutputStream;
023import java.nio.ByteOrder;
024import java.util.List;
025
026import org.apache.commons.imaging.ImageWriteException;
027import org.apache.commons.imaging.common.BinaryOutputStream;
028
029public class TiffImageWriterLossy extends TiffImageWriterBase {
030
031    public TiffImageWriterLossy() {
032        // with default byte order
033    }
034
035    public TiffImageWriterLossy(final ByteOrder byteOrder) {
036        super(byteOrder);
037    }
038
039    @Override
040    public void write(final OutputStream os, final TiffOutputSet outputSet)
041            throws IOException, ImageWriteException {
042        final TiffOutputSummary outputSummary = validateDirectories(outputSet);
043
044        final List<TiffOutputItem> outputItems = outputSet.getOutputItems(outputSummary);
045
046        updateOffsetsStep(outputItems);
047
048        outputSummary.updateOffsets(byteOrder);
049
050        final BinaryOutputStream bos = new BinaryOutputStream(os, byteOrder);
051
052        writeStep(bos, outputItems);
053    }
054
055    private void updateOffsetsStep(final List<TiffOutputItem> outputItems) {
056        int offset = TIFF_HEADER_SIZE;
057
058        for (final TiffOutputItem outputItem : outputItems) {
059            outputItem.setOffset(offset);
060            final int itemLength = outputItem.getItemLength();
061            offset += itemLength;
062
063            final int remainder = imageDataPaddingLength(itemLength);
064            offset += remainder;
065        }
066    }
067
068    private void writeStep(final BinaryOutputStream bos,
069            final List<TiffOutputItem> outputItems) throws IOException,
070            ImageWriteException {
071        writeImageFileHeader(bos);
072
073        for (final TiffOutputItem outputItem : outputItems) {
074            outputItem.writeItem(bos);
075
076            final int length = outputItem.getItemLength();
077
078            final int remainder = imageDataPaddingLength(length);
079            for (int j = 0; j < remainder; j++) {
080                bos.write(0);
081            }
082        }
083
084    }
085}