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#pragma once
#include "fwd.h"
#include "input.h"
#include "output.h"
#include "buffered.h"
#include "mem.h"
#include <util/system/file.h>
#include <utility>
/**
* @addtogroup Streams_Files
* @{
*/
/**
* Unbuffered file input stream.
*
* Note that the input is not buffered, which means that `ReadLine` calls will
* be _very_ slow.
*/
class TUnbufferedFileInput: public IInputStream {
public:
TUnbufferedFileInput(const char* path);
TUnbufferedFileInput(const TString& path);
TUnbufferedFileInput(const std::filesystem::path& path);
TUnbufferedFileInput(const TFile& file);
private:
static constexpr EOpenMode OPEN_MODE = OpenExisting | RdOnly | Seq;
size_t DoRead(void* buf, size_t len) override;
size_t DoSkip(size_t len) override;
private:
TFile File_;
};
/**
* Memory-mapped file input stream.
*/
class TMappedFileInput: public TMemoryInput {
public:
TMappedFileInput(const TFile& file);
TMappedFileInput(const TString& path);
~TMappedFileInput() override;
private:
class TImpl;
THolder<TImpl> Impl_;
};
/**
* File output stream.
*
* Note that the output is unbuffered, thus writing in many small chunks is
* likely to be quite slow.
*/
class TUnbufferedFileOutput: public IOutputStream {
public:
TUnbufferedFileOutput(const char* path);
TUnbufferedFileOutput(const TString& path);
TUnbufferedFileOutput(const std::filesystem::path& path);
TUnbufferedFileOutput(const TFile& file);
~TUnbufferedFileOutput() override;
TUnbufferedFileOutput(TUnbufferedFileOutput&&) noexcept = default;
TUnbufferedFileOutput& operator=(TUnbufferedFileOutput&&) noexcept = default;
private:
static constexpr EOpenMode OPEN_MODE = CreateAlways | WrOnly | Seq;
void DoWrite(const void* buf, size_t len) override;
void DoFlush() override;
private:
TFile File_;
};
/**
* Buffered file input stream.
*
* @see TBuffered
*/
class TFileInput: public TBuffered<TUnbufferedFileInput> {
public:
template <class T>
inline TFileInput(T&& t, size_t buf = 1 << 13)
: TBuffered<TUnbufferedFileInput>(buf, std::forward<T>(t))
{
}
~TFileInput() override = default;
};
/**
* Buffered file output stream.
*
* Currently deprecated, please use TFileOutput in new code.
*
* @deprecated
* @see TBuffered
*/
class TFixedBufferFileOutput: public TBuffered<TUnbufferedFileOutput> {
public:
template <class T>
inline TFixedBufferFileOutput(T&& t, size_t buf = 1 << 13)
: TBuffered<TUnbufferedFileOutput>(buf, std::forward<T>(t))
{
}
~TFixedBufferFileOutput() override = default;
};
/** @} */
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