src/test/java/org/apache/commons/imaging/formats/tiff/TiffLzwTest.java

/*
 * 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.formats.tiff;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.imaging.common.BinaryConstants;
import org.apache.commons.imaging.common.mylzw.MyLzwCompressor;
import org.apache.commons.imaging.common.mylzw.MyLzwDecompressor;
import org.apache.commons.imaging.util.Debug;

public class TiffLzwTest extends TiffBaseTest implements BinaryConstants
{

    public void testTrivial() throws Exception
    {
        byte bytes[] = { 0, };
        compressRoundtripAndValidate(bytes);
    }

    public void testMedium() throws Exception
    {
        int LENGTH = 1024 * 32;
        byte bytes[] = new byte[LENGTH];
        for (int modulator = 1; modulator < 255; modulator += 3)
        {
            for (int i = 0; i < LENGTH; i++)
                bytes[i] = (byte) (0xff & (i % modulator));

            compressRoundtripAndValidate(bytes);
        }
    }

//    public void testTiffImageData() throws IOException, ImageReadException,
//            ImageWriteException
//    {
//        List images = getTiffImages();
//        for (int i = 0; i < images.size(); i++)
//        {
//            if (i % 10 == 0)
//                Debug.purgeMemory();
//
//            File imageFile = (File) images.get(i);
//            Debug.debug("imageFile", imageFile);
//
//            ByteSource byteSource = new ByteSourceFile(imageFile);
//            Map params = new HashMap();
//            List data = new TiffImageParser().collectRawImageData(byteSource,
//                    params);
//
//            for (int j = 0; j < data.size(); j++)
//            {
//                byte bytes[] = (byte[]) data.get(j);
//                decompressRoundtripAndValidate(bytes);
//            }
//        }
//    }

    private void compressRoundtripAndValidate(byte src[]) throws IOException
    {
        final boolean DEBUG = false;

        if (DEBUG)
        {
            Debug.debug();
            Debug.debug("roundtripAndValidate: " + src.length);
            Debug.debug();
        }

        int LZW_MINIMUM_CODE_SIZE = 8;
        final List codes = new ArrayList();
        MyLzwCompressor.Listener compressionListener = new MyLzwCompressor.Listener() {
            public void dataCode(int code)
            {
                codes.add(new Integer(code));
            }

            public void eoiCode(int code)
            {
                codes.add(new Integer(code));
            }

            public void clearCode(int code)
            {
                codes.add(new Integer(code));
            }

            public void init(int clearCode, int eoiCode)
            {
            }
        };

        MyLzwCompressor compressor = new MyLzwCompressor(LZW_MINIMUM_CODE_SIZE,
                BYTE_ORDER_MSB, true, compressionListener);
        byte compressed[] = compressor.compress(src);

        MyLzwDecompressor.Listener decompressionListener = new MyLzwDecompressor.Listener() {

            int index = 0;
            int clearCode, eoiCode;

            public void code(int code)
            {
                if (DEBUG)
                {
                    if (code == clearCode)
                    {
                        Debug.debug("clearCode: " + index + "/" + codes.size());
                        Debug.debug();
                    }
                    if (code == eoiCode)
                    {
                        Debug.debug("eoiCode: " + index + "/" + codes.size());
                        Debug.debug();
                    }
                }
                Integer expectedCode = (Integer) codes.get(index++);
                if (code != expectedCode.intValue())
                {
                    Debug.debug("bad code: " + index + "/" + codes.size());
                    Debug.debug("code: " + code + " (0x"
                            + Integer.toHexString(code) + ") "
                            + Integer.toBinaryString(code));
                    Debug.debug("expected: " + expectedCode + " (0x"
                            + Integer.toHexString(expectedCode.intValue())
                            + ") "
                            + Integer.toBinaryString(expectedCode.intValue()));
                    Debug.debug("clearCode: " + clearCode + " (0x"
                            + Integer.toHexString(clearCode) + ") "
                            + Integer.toBinaryString(clearCode));
                    Debug.debug("eoiCode: " + eoiCode + " (0x"
                            + Integer.toHexString(eoiCode) + ") "
                            + Integer.toBinaryString(eoiCode));
                    Debug.debug();
                }
            }

            public void init(int clearCode, int eoiCode)
            {
                this.clearCode = clearCode;
                this.eoiCode = eoiCode;
            }

        };
        InputStream is = new ByteArrayInputStream(compressed);
        MyLzwDecompressor decompressor = new MyLzwDecompressor(
                LZW_MINIMUM_CODE_SIZE, BYTE_ORDER_NETWORK,
                decompressionListener);
        decompressor.setTiffLZWMode();
        byte decompressed[] = decompressor.decompress(is, src.length);

        assertEquals(src.length, decompressed.length);
        for (int i = 0; i < src.length; i++)
            assertEquals(src[i], decompressed[i]);
    }

    private void decompressRoundtripAndValidate(byte src[]) throws IOException
    {
        Debug.debug();
        Debug.debug("roundtripAndValidate: " + src.length);
        Debug.debug();

        int LZW_MINIMUM_CODE_SIZE = 8;
        final List codes = new ArrayList();

        MyLzwDecompressor.Listener decompressionListener = new MyLzwDecompressor.Listener() {

            public void code(int code)
            {
                Debug.debug("listener code: " + code + " (0x"
                        + Integer.toHexString(code) + ") "
                        + Integer.toBinaryString(code) + ", index: "
                        + codes.size());
                codes.add(new Integer(code));
            }

            public void init(int clearCode, int eoiCode)
            {
            }

        };
        InputStream is = new ByteArrayInputStream(src);
        MyLzwDecompressor decompressor = new MyLzwDecompressor(
                LZW_MINIMUM_CODE_SIZE, BYTE_ORDER_NETWORK,
                decompressionListener);
        decompressor.setTiffLZWMode();
        byte decompressed[] = decompressor.decompress(is, src.length);

        MyLzwCompressor.Listener compressionListener = new MyLzwCompressor.Listener() {

            int clearCode, eoiCode;

            public void init(int clearCode, int eoiCode)
            {
                this.clearCode = clearCode;
                this.eoiCode = eoiCode;
            }

            int index = 0;

            private void code(int code)
            {

                if (code == clearCode)
                {
                    Debug.debug("clearCode: " + index + "/" + codes.size());
                    Debug.debug();
                }
                if (code == eoiCode)
                {
                    Debug.debug("eoiCode: " + index + "/" + codes.size());
                    Debug.debug();
                }
                Integer expectedCode = (Integer) codes.get(index++);
                if (code != expectedCode.intValue())
                {
                    Debug.debug("bad code: " + index + "/" + codes.size());
                    Debug.debug("code: " + code + " (0x"
                            + Integer.toHexString(code) + ") "
                            + Integer.toBinaryString(code));
                    Debug.debug("expected: " + expectedCode + " (0x"
                            + Integer.toHexString(expectedCode.intValue())
                            + ") "
                            + Integer.toBinaryString(expectedCode.intValue()));
                    Debug.debug("clearCode: " + clearCode + " (0x"
                            + Integer.toHexString(clearCode) + ") "
                            + Integer.toBinaryString(clearCode));
                    Debug.debug("eoiCode: " + eoiCode + " (0x"
                            + Integer.toHexString(eoiCode) + ") "
                            + Integer.toBinaryString(eoiCode));
                    Debug.debug();
                }
            }

            public void dataCode(int code)
            {
                code(code);
            }

            public void eoiCode(int code)
            {
                code(code);
            }

            public void clearCode(int code)
            {
                code(code);
            }

        };

        MyLzwCompressor compressor = new MyLzwCompressor(LZW_MINIMUM_CODE_SIZE,
                BYTE_ORDER_MSB, true, compressionListener);
        byte compressed[] = compressor.compress(decompressed);

        assertEquals(src.length, compressed.length);
        for (int i = 0; i < src.length; i++)
            assertEquals(src[i], compressed[i]);
    }

}