/*

 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

import java.io.ByteArrayInputStream;

import javax.sound.sampled.AudioFileFormat;

import javax.sound.sampled.AudioFormat;

import javax.sound.sampled.AudioInputStream;

import javax.sound.sampled.AudioSystem;

/**

 * @test

 * @bug 6729836

 */

public final class RecognizeHugeAuFiles {

    /**

     * The size of the header's data.

     */

    private static final byte AU_HEADER = 44;

    /**

     * This value should be used if the size in bytes is unknown.

     */

    private static final /* unsigned int */ long MAX_UNSIGNED_INT = 0xffffffffL;

    /**

     * The list of supported au formats and sample size in bits per format.

     */

    private static final byte[][] auTypeBits = {

            {1, 8}, {2, 8}, {3, 16}, {4, 24}, {5, 32}, {6, 32}, {27, 8}

    };

    /**

     * The list of supported sample rates(stored as unsigned int).

     */

    private static final int[] sampleRates = {

            8000, 11025, 16000, 22050, 32000, 37800, 44056, 44100, 47250, 48000,

            50000, 50400, 88200, 96000, 176400, 192000, 352800, 2822400,

            5644800, Integer.MAX_VALUE

    };

    /**

     * The list of supported channels (stored as unsigned int).

     */

    private static final int[] channels = {

            1, 2, 3, 4, 5, 6, 7, 8, 9, 10

    };

    /**

     * The list of supported size of data (stored as unsigned int).

     * <p>

     * The {@code MAX_UNSIGNED_INT} used if the size in bytes is unknown.

     */

    private static final long[] dataSizes = {

            0, 1, 2, 3, Integer.MAX_VALUE - AU_HEADER, Integer.MAX_VALUE - 1,

            Integer.MAX_VALUE, (long) Integer.MAX_VALUE + 1,

            (long) Integer.MAX_VALUE + AU_HEADER, MAX_UNSIGNED_INT - AU_HEADER,

            MAX_UNSIGNED_INT - 1, MAX_UNSIGNED_INT

    };

    public static void main(final String[] args) throws Exception {

        for (final byte[] type : auTypeBits) {

            for (final int sampleRate : sampleRates) {

                for (final int channel : channels) {

                    for (final long dataSize : dataSizes) {

                        testAFF(type, sampleRate, channel, dataSize);

                        testAIS(type, sampleRate, channel, dataSize);

                    }

                }

            }

        }

    }

    /**

     * Tests the {@code AudioFileFormat} fetched from the fake header.

     * <p>

     * Note that the frameLength and byteLength are stored as int which means

     * that {@code AudioFileFormat} will store the data above {@code  MAX_INT}

     * as NOT_SPECIFIED.

     */

    private static void testAFF(final byte[] type, final int rate,

                                final int channel, final long size)

            throws Exception {

        final byte[] header = createHeader(type, rate, channel, size);

        final ByteArrayInputStream fake = new ByteArrayInputStream(header);

        final AudioFileFormat aff = AudioSystem.getAudioFileFormat(fake);

        final AudioFormat format = aff.getFormat();

        if (aff.getType() != AudioFileFormat.Type.AU) {

            throw new RuntimeException("Error");

        }

        final long frameLength = size / format.getFrameSize();

        if (size != MAX_UNSIGNED_INT && frameLength <= Integer.MAX_VALUE) {

            if (aff.getFrameLength() != frameLength) {

                System.err.println("Expected: " + frameLength);

                System.err.println("Actual: " + aff.getFrameLength());

                throw new RuntimeException();

            }

        } else {

            if (aff.getFrameLength() != AudioSystem.NOT_SPECIFIED) {

                System.err.println("Expected: " + AudioSystem.NOT_SPECIFIED);

                System.err.println("Actual: " + aff.getFrameLength());

                throw new RuntimeException();

            }

        }

        final long byteLength = size + AU_HEADER;

        if (byteLength <= Integer.MAX_VALUE) {

            if (aff.getByteLength() != byteLength) {

                System.err.println("Expected: " + byteLength);

                System.err.println("Actual: " + aff.getByteLength());

                throw new RuntimeException();

            }

        } else {

            if (aff.getByteLength() != AudioSystem.NOT_SPECIFIED) {

                System.err.println("Expected: " + AudioSystem.NOT_SPECIFIED);

                System.err.println("Actual: " + aff.getByteLength());

                throw new RuntimeException();

            }

        }

        validateFormat(type[1], rate, channel, aff.getFormat());

    }

    /**

     * Tests the {@code AudioInputStream} fetched from the fake header.

     * <p>

     * Note that the frameLength is stored as long which means

     * that {@code AudioInputStream} must store all possible data from au file.

     */

    private static void testAIS(final byte[] type, final int rate,

                                final int channel, final long size)

            throws Exception {

        final byte[] header = createHeader(type, rate, channel, size);

        final ByteArrayInputStream fake = new ByteArrayInputStream(header);

        final AudioInputStream ais = AudioSystem.getAudioInputStream(fake);

        final AudioFormat format = ais.getFormat();

        final long frameLength = size / format.getFrameSize();

        if (size != MAX_UNSIGNED_INT) {

            if (frameLength != ais.getFrameLength()) {

                System.err.println("Expected: " + frameLength);

                System.err.println("Actual: " + ais.getFrameLength());

                throw new RuntimeException();

            }

        } else {

            if (ais.getFrameLength() != AudioSystem.NOT_SPECIFIED) {

                System.err.println("Expected: " + AudioSystem.NOT_SPECIFIED);

                System.err.println("Actual: " + ais.getFrameLength());

                throw new RuntimeException();

            }

        }

        if (ais.available() < 0) {

            System.err.println("available should be >=0: " + ais.available());

            throw new RuntimeException();

        }

        validateFormat(type[1], rate, channel, format);

    }

    /**

     * Tests that format contains the same data as were provided to the fake

     * stream.

     */

    private static void validateFormat(final byte bits, final int rate,

                                       final int channel,

                                       final AudioFormat format) {

        if (Float.compare(format.getSampleRate(), rate) != 0) {

            System.out.println("Expected: " + rate);

            System.out.println("Actual: " + format.getSampleRate());

            throw new RuntimeException();

        }

        if (format.getChannels() != channel) {

            System.out.println("Expected: " + channel);

            System.out.println("Actual: " + format.getChannels());

            throw new RuntimeException();

        }

        int frameSize = ((bits + 7) / 8) * channel;

        if (format.getFrameSize() != frameSize) {

            System.out.println("Expected: " + frameSize);

            System.out.println("Actual: " + format.getFrameSize());

            throw new RuntimeException();

        }

    }

    /**

     * Creates the custom header of the AU file. It is expected that all passed

     * data are supported.

     */

    private static byte[] createHeader(final byte[] type, final int rate,

                                       final int channel, final long size) {

        return new byte[]{

                // AU_SUN_MAGIC

                0x2e, 0x73, 0x6e, 0x64,

                // headerSize

                0, 0, 0, AU_HEADER,

                // dataSize

                (byte) (size >> 24), (byte) (size >> 16), (byte) (size >> 8),

                (byte) size,

                // encoding

                0, 0, 0, type[0],

                // sampleRate

                (byte) (rate >> 24), (byte) (rate >> 16), (byte) (rate >> 8),

                (byte) (rate),

                // channels

                (byte) (channel >> 24), (byte) (channel >> 16),

                (byte) (channel >> 8), (byte) (channel),

                // data

                0, 0, 0, 0, 0, 0

        };

    }

}