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#pragma once
#include <util/stream/output.h>
#include <util/stream/input.h>
#include <util/generic/ptr.h>
#include <util/generic/yexception.h>
#include <library/cpp/streams/lz/common/error.h>
#include <library/cpp/streams/lz/lz4/lz4.h>
#include <library/cpp/streams/lz/snappy/snappy.h>
/**
* @file
*
* All lz compressors compress blocks. `Write` method splits input data into
* blocks, compresses each block and then writes each compressed block to the
* underlying output stream. Thus compression classes are not buffered.
* MaxBlockSize parameter specified max allowed block size.
*
* See http://altdevblogaday.com/2011/04/22/survey-of-fast-compression-algorithms-part-1/
* for some comparisons.
*/
/**
* @addtogroup Streams_Archs
* @{
*/
/**
* MiniLZO compressing stream.
*/
class TLzoCompress: public IOutputStream {
public:
TLzoCompress(IOutputStream* slave, ui16 maxBlockSize = 1 << 15);
~TLzoCompress() override;
private:
void DoWrite(const void* buf, size_t len) override;
void DoFlush() override;
void DoFinish() override;
private:
class TImpl;
THolder<TImpl> Impl_;
};
/**
* MiniLZO decompressing stream.
*/
class TLzoDecompress: public IInputStream {
public:
TLzoDecompress(IInputStream* slave);
~TLzoDecompress() override;
private:
size_t DoRead(void* buf, size_t len) override;
private:
class TImpl;
THolder<TImpl> Impl_;
};
/**
* FastLZ compressing stream.
*/
class TLzfCompress: public IOutputStream {
public:
TLzfCompress(IOutputStream* slave, ui16 maxBlockSize = 1 << 15);
~TLzfCompress() override;
private:
void DoWrite(const void* buf, size_t len) override;
void DoFlush() override;
void DoFinish() override;
private:
class TImpl;
THolder<TImpl> Impl_;
};
/**
* FastLZ decompressing stream.
*/
class TLzfDecompress: public IInputStream {
public:
TLzfDecompress(IInputStream* slave);
~TLzfDecompress() override;
private:
size_t DoRead(void* buf, size_t len) override;
private:
class TImpl;
THolder<TImpl> Impl_;
};
/**
* QuickLZ compressing stream.
*/
class TLzqCompress: public IOutputStream {
public:
enum EVersion {
V_1_31 = 0,
V_1_40 = 1,
V_1_51 = 2
};
/*
* streaming mode - actually, backlog size
*/
enum EMode {
M_0 = 0,
M_100000 = 1,
M_1000000 = 2
};
TLzqCompress(IOutputStream* slave, ui16 maxBlockSize = 1 << 15,
EVersion ver = V_1_31,
unsigned level = 0,
EMode mode = M_0);
~TLzqCompress() override;
private:
void DoWrite(const void* buf, size_t len) override;
void DoFlush() override;
void DoFinish() override;
private:
class TImpl;
THolder<TImpl> Impl_;
};
/**
* QuickLZ decompressing stream.
*/
class TLzqDecompress: public IInputStream {
public:
TLzqDecompress(IInputStream* slave);
~TLzqDecompress() override;
private:
size_t DoRead(void* buf, size_t len) override;
private:
class TImpl;
THolder<TImpl> Impl_;
};
/** @} */
/**
* Reads a compression signature from the provided input stream and returns a
* corresponding decompressing stream.
*
* Note that returned stream doesn't own the provided input stream, thus it's
* up to the user to free them both.
*
* @param input Stream to decompress.
* @return Decompressing proxy input stream.
*/
TAutoPtr<IInputStream> OpenLzDecompressor(IInputStream* input);
TAutoPtr<IInputStream> TryOpenLzDecompressor(IInputStream* input);
TAutoPtr<IInputStream> TryOpenLzDecompressor(const TStringBuf& signature, IInputStream* input);
TAutoPtr<IInputStream> OpenOwnedLzDecompressor(TAutoPtr<IInputStream> input);
TAutoPtr<IInputStream> TryOpenOwnedLzDecompressor(TAutoPtr<IInputStream> input);
TAutoPtr<IInputStream> TryOpenOwnedLzDecompressor(const TStringBuf& signature, TAutoPtr<IInputStream> input);
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