/*

 * Copyright (c) 2011, 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

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

/**

 * @test

 * @bug 6571338

 * @summary Inflater should not require a buffer to the inflate() methods

 * larger than 1 byte.

 */

import java.io.*;

import java.nio.*;

import java.util.*;

import java.util.zip.*;

public class InflaterBufferSize {

    private static final int DATA_LEN = 1024 *64;

    private static byte[] data;

    // If true, print extra info.

    private static final boolean debug = System.getProperty("debug") != null;

    private static void debug(String s) {

        if (debug) System.out.println(s);

    }

    private static void createData() {

        ByteBuffer bb = ByteBuffer.allocate(8);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        for (int i = 0; i < DATA_LEN; i++) {

            bb.putDouble(0, Math.random());

            baos.write(bb.array(), 0, 8);

        }

        data = baos.toByteArray();

    }

    private static byte[] grow(byte[] a, int capacity) {

        while (a.length < capacity) {

            byte[] a2 = new byte[a.length * 2];

            System.arraycopy(a, 0, a2, 0, a.length);

            a = a2;

        }

        return a;

    }

    private static byte[] trim(byte[] a, int length) {

        byte[] res = new byte[length];

        System.arraycopy(a, 0, res, 0, length);

        return res;

    }

    private static byte[] deflate(byte[] in, int level) throws Throwable {

        final Deflater flater = new Deflater(level);

        flater.setInput(in);

        flater.finish();

        final byte[] smallBuffer = new byte[32];

        byte[] flated = new byte[32];

        int count = 0;

        int n;

        while ((n = flater.deflate(smallBuffer)) > 0) {

            flated = grow(flated, count + n);

            System.arraycopy(smallBuffer, 0, flated, count, n);

            count += n;

        }

        return trim(flated, count);

    }

    private static byte[] inflate(byte[] in) throws Throwable {

        final Inflater flater = new Inflater();

        flater.setInput(in);

        // This is the buffer of interest.  It should be possible to use any

        // non-zero size.

        final byte[] smallBuffer = new byte[1];

        byte[] flated = new byte[32];

        int count = 0;

        int n;

        while ((n = flater.inflate(smallBuffer)) > 0) {

            flated = grow(flated, count + n);

            System.arraycopy(smallBuffer, 0, flated, count, n);

            count += n;

        }

        return trim(flated, count);

    }

    public static void realMain(String[] args) throws Throwable {

        byte deflated[], inflated[];

        int level = -1;

        if (args.length > 0) {

          level = Integer.parseInt(args[0]);

        }

        debug("Using level " + level);

        if (args.length > 1) {

            FileInputStream fis = new FileInputStream(args[1]);

            int len = fis.available();

            data = new byte[len];

            check(fis.read(data, 0, len) == len, "Did not read complete file");

            debug("Original data from " + args[1]);

            fis.close();

        } else {

            createData();

            debug("Original data from random byte array");

        }

        debug("Original data length: " + data.length + " bytes");

        debug("");

        deflated = deflate(data, level);

        debug("Deflated data length: " + deflated.length + " bytes");

        inflated = inflate(deflated);

        debug("Inflated data length: "+ inflated.length + " bytes" );

        if (!check(Arrays.equals(data, inflated),

                   "Inflated and deflated arrays do not match")) {

            OutputStream os = new BufferedOutputStream(new FileOutputStream("deflated.zip"));

            try {

                os.write(deflated);

            } finally {

                os.close();

            }

        }

    }

    //--------------------- Infrastructure ---------------------------

    static volatile int passed = 0, failed = 0;

    static void pass() {passed++;}

    static void pass(String msg) {System.out.println(msg); passed++;}

    static void fail() {failed++; Thread.dumpStack();}

    static void fail(String msg) {System.out.println(msg); fail();}

    static void unexpected(Throwable t) {failed++; t.printStackTrace();}

    static void unexpected(Throwable t, String msg) {

        System.out.println(msg); failed++; t.printStackTrace();}

    static boolean check(boolean cond) {if (cond) pass(); else fail(); return cond;}

    static boolean check(boolean cond, String msg) {if (cond) pass(); else fail(msg); return cond;}

    static void equal(Object x, Object y) {

        if (x == null ? y == null : x.equals(y)) pass();

        else fail(x + " not equal to " + y);}

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

        try {realMain(args);} catch (Throwable t) {unexpected(t);}

        System.out.println("\nPassed = " + passed + " failed = " + failed);

        if (failed > 0) throw new AssertionError("Some tests failed");}

}