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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 "SkTypes.h"
#ifndef Sk_NO_FLATE
#include "SkStream.h"
class SkData;
/** \class SkFlate
A class to provide access to the flate compression algorithm.
*/
class SkFlate {
public:
/**
* Use the flate compression algorithm to compress the data in src,
* putting the result into dst. Returns false if an error occurs.
*/
static bool Deflate(SkStream* src, SkWStream* dst);
/**
* Use the flate compression algorithm to compress the data in src,
* putting the result into dst. Returns false if an error occurs.
*/
static bool Deflate(const void* src, size_t len, SkWStream* dst);
/**
* Use the flate compression algorithm to compress the data,
* putting the result into dst. Returns false if an error occurs.
*/
static bool Deflate(const SkData*, SkWStream* dst);
/** Use the flate compression algorithm to decompress the data in src,
putting the result into dst. Returns false if an error occurs.
*/
static bool Inflate(SkStream* src, SkWStream* dst);
};
/**
* Wrap a stream in this class to compress the information written to
* this stream using the Deflate algorithm. Uses Zlib's
* Z_DEFAULT_COMPRESSION level.
*
* See http://en.wikipedia.org/wiki/DEFLATE
*/
class SkDeflateWStream : public SkWStream {
public:
/** Does not take ownership of the stream. */
SkDeflateWStream(SkWStream*);
/** 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;
SkAutoTDelete<Impl> fImpl;
};
#endif // SK_NO_FLATE
#endif // SkFlate_DEFINED
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