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/*
==============================================================================
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() override;
//==============================================================================
/** 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;
std::unique_ptr<GZIPCompressorHelper> helper;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (GZIPCompressorOutputStream)
};
} // namespace juce
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