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        // NB: resource is intentionally left open
053        writeStep(bos, outputItems);
054    }
055
056    private void updateOffsetsStep(final List<TiffOutputItem> outputItems) {
057        int offset = TIFF_HEADER_SIZE;
058
059        for (final TiffOutputItem outputItem : outputItems) {
060            outputItem.setOffset(offset);
061            final int itemLength = outputItem.getItemLength();
062            offset += itemLength;
063
064            final int remainder = imageDataPaddingLength(itemLength);
065            offset += remainder;
066        }
067    }
068
069    private void writeStep(final BinaryOutputStream bos,
070            final List<TiffOutputItem> outputItems) throws IOException,
071            ImageWriteException {
072        writeImageFileHeader(bos);
073
074        for (final TiffOutputItem outputItem : outputItems) {
075            outputItem.writeItem(bos);
076
077            final int length = outputItem.getItemLength();
078
079            final int remainder = imageDataPaddingLength(length);
080            for (int j = 0; j < remainder; j++) {
081                bos.write(0);
082            }
083        }
084
085    }
086}