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#pragma once
#include "header.h"
#include <library/cpp/deprecated/mapped_file/mapped_file.h>
#include <util/generic/noncopyable.h>
#include <util/stream/file.h>
#include <util/system/filemap.h>
#define FS_BLOCK_SIZE 512
class TFileManipBase {
protected:
TFileManipBase();
virtual ~TFileManipBase() {
}
i64 DoSeek(i64 offset, int whence, bool isStreamOpen);
int DoFileOpen(const TFile& file);
int DoFileClose();
int IsFileBased() const;
inline void SetFileBased(bool fileBased) {
FileBased = fileBased;
}
inline i64 DoGetPosition() const {
Y_ASSERT(FileBased);
return File.GetPosition();
}
inline i64 DoGetLength() const {
return (FileBased) ? File.GetLength() : -1;
}
inline void VerifyRandomAccess() const {
Y_VERIFY(FileBased, "non-file stream can not be accessed randomly");
}
inline i64 GetPosition() const {
return (i64)File.GetPosition();
}
private:
TFile File;
bool FileBased;
};
class TInputFileManip: public TFileManipBase {
public:
using TFileManipBase::GetPosition;
TInputFileManip();
int Open(const char* fname, bool direct = false);
int Open(IInputStream& input);
int Open(TAutoPtr<IInputStream> input);
int Init(const TFile& file);
int Close();
ssize_t Read(void* buf, unsigned len);
inline bool IsOpen() const {
return IsStreamOpen();
}
inline i64 GetLength() const {
return DoGetLength();
}
inline i64 Seek(i64 offset, int whence) {
return DoSeek(offset, whence, IsStreamOpen());
}
inline i64 RealSeek(i64 offset, int whence) {
return Seek(offset, whence);
}
protected:
inline bool IsStreamOpen() const {
return !!InputStream;
}
inline int DoStreamOpen(IInputStream* input, bool fileBased = false) {
InputStream.Reset(input);
SetFileBased(fileBased);
return 0;
}
inline int DoStreamOpen(const TFile& file) {
int ret;
return (ret = DoFileOpen(file)) ? ret : DoStreamOpen(CreateStream(file), IsFileBased());
}
virtual IInputStream* CreateStream(const TFile& file);
inline bool DoClose() {
if (IsStreamOpen()) {
InputStream.Destroy();
return DoFileClose();
}
return 0;
}
THolder<IInputStream> InputStream;
};
class TMappedInputPageFile: private TNonCopyable {
public:
TMappedInputPageFile();
~TMappedInputPageFile();
inline int GetError() const {
return Error;
}
inline size_t GetPageSize() const {
return Pagesize;
}
inline int GetLastPage() const {
return Pagenum;
}
inline ui32 GetRecordSig() const {
return Recordsig;
}
inline bool IsOpen() const {
return Open;
}
inline char* GetData() const {
return Open ? (char*)Mappedfile.getData() : nullptr;
}
inline size_t GetSize() const {
return Open ? Mappedfile.getSize() : 0;
}
protected:
int Init(const char* fname, ui32 recsig, ui32* gotRecordSig = nullptr, bool direct = false);
int Term();
TMappedFile Mappedfile;
size_t Pagesize;
int Error;
int Pagenum;
ui32 Recordsig;
bool Open;
};
class TOutputFileManip: public TFileManipBase {
public:
TOutputFileManip();
int Open(const char* fname, EOpenMode mode = WrOnly | CreateAlways | ARW | AWOther);
int Open(IOutputStream& output);
int Open(TAutoPtr<IOutputStream> output);
int Init(const TFile& file);
int Rotate(const char* newfname);
int Write(const void* buf, unsigned len);
int Close();
inline bool IsOpen() const {
return IsStreamOpen();
}
inline i64 GetLength() const {
return DoGetLength();
}
inline i64 Seek(i64 offset, int whence) {
return DoSeek(offset, whence, IsStreamOpen());
}
inline i64 RealSeek(i64 offset, int whence) {
return Seek(offset, whence);
}
protected:
inline bool IsStreamOpen() const {
return !!OutputStream;
}
inline int DoStreamOpen(IOutputStream* output, bool fileBased = false) {
OutputStream.Reset(output);
SetFileBased(fileBased);
return 0;
}
inline int DoStreamOpen(const TFile& file) {
int ret;
return (ret = DoFileOpen(file)) ? ret : DoStreamOpen(CreateStream(file), true);
}
virtual IOutputStream* CreateStream(const TFile& file);
inline bool DoClose() {
if (IsStreamOpen()) {
OutputStream.Destroy();
return DoFileClose();
}
return 0;
}
THolder<IOutputStream> OutputStream;
};
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