/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

//==============================================================================
/**
    A stream which uses zlib to compress the data written into it.

    Important note: When you call flush() on a GZIPCompressorOutputStream,
    the gzip data is closed - this means that no more data can be written to
    it, and any subsequent attempts to call write() will cause an assertion.

    @see GZIPDecompressorInputStream

    @tags{Core}
*/
class JUCE_API  GZIPCompressorOutputStream  : public OutputStream
{
public:
    //==============================================================================
    /** Creates a compression stream.
        @param destStream                       the stream into which the compressed data will be written
        @param compressionLevel                 how much to compress the data, between 0 and 9, where
                                                0 is non-compressed storage, 1 is the fastest/lowest compression,
                                                and 9 is the slowest/highest compression. Any value outside this range
                                                indicates that a default compression level should be used.
        @param windowBits                       this is used internally to change the window size used
                                                by zlib - leave it as 0 unless you specifically need to set
                                                its value for some reason
    */
    GZIPCompressorOutputStream (OutputStream& destStream,
                                int compressionLevel = -1,
                                int windowBits = 0);

    /** Creates a compression stream.
        @param destStream                       the stream into which the compressed data will be written.
                                                Ownership of this object depends on the value of deleteDestStreamWhenDestroyed
        @param compressionLevel                 how much to compress the data, between 0 and 9, where
                                                0 is non-compressed storage, 1 is the fastest/lowest compression,
                                                and 9 is the slowest/highest compression. Any value outside this range
                                                indicates that a default compression level should be used.
        @param deleteDestStreamWhenDestroyed    whether or not the GZIPCompressorOutputStream will delete the
                                                destStream object when it is destroyed
        @param windowBits                       this is used internally to change the window size used
                                                by zlib - leave it as 0 unless you specifically need to set
                                                its value for some reason
    */
    GZIPCompressorOutputStream (OutputStream* destStream,
                                int compressionLevel = -1,
                                bool deleteDestStreamWhenDestroyed = false,
                                int windowBits = 0);

    /** Destructor. */
    ~GZIPCompressorOutputStream();

    //==============================================================================
    /** Flushes and closes the stream.
        Note that unlike most streams, when you call flush() on a GZIPCompressorOutputStream,
        the stream is closed - this means that no more data can be written to it, and any
        subsequent attempts to call write() will cause an assertion.
    */
    void flush() override;

    int64 getPosition() override;
    bool setPosition (int64) override;
    bool write (const void*, size_t) override;

    /** These are preset values that can be used for the constructor's windowBits parameter.
        For more info about this, see the zlib documentation for its windowBits parameter.
    */
    enum WindowBitsValues
    {
        windowBitsRaw = -15,
        windowBitsGZIP = 15 + 16
    };

private:
    //==============================================================================
    OptionalScopedPointer<OutputStream> destStream;

    class GZIPCompressorHelper;
    friend struct ContainerDeletePolicy<GZIPCompressorHelper>;
    std::unique_ptr<GZIPCompressorHelper> helper;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (GZIPCompressorOutputStream)
};

} // namespace juce
