/*
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* Copyright 2010 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkFlate_DEFINED
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#define SkFlate_DEFINED
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#include "SkStream.h"
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/**
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* Wrap a stream in this class to compress the information written to
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* this stream using the Deflate algorithm.
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*
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* See http://en.wikipedia.org/wiki/DEFLATE
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*/
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class SkDeflateWStream final : public SkWStream {
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public:
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/** Does not take ownership of the stream.
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@param compressionLevel - 0 is no compression; 1 is best
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speed; 9 is best compression. The default, -1, is to use
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zlib's Z_DEFAULT_COMPRESSION level.
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@param gzip iff true, output a gzip file. "The gzip format is
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a wrapper, documented in RFC 1952, around a deflate stream."
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gzip adds a header with a magic number to the beginning of the
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stream, allowing a client to identify a gzip file.
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*/
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SkDeflateWStream(SkWStream*,
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int compressionLevel = -1,
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bool gzip = false);
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/** The destructor calls finalize(). */
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~SkDeflateWStream() override;
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/** Write the end of the compressed stream. All subsequent calls to
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write() will fail. Subsequent calls to finalize() do nothing. */
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void finalize();
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// The SkWStream interface:
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bool write(const void*, size_t) override;
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size_t bytesWritten() const override;
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private:
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struct Impl;
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std::unique_ptr<Impl> fImpl;
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};
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#endif // SkFlate_DEFINED
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