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