/usr/include/root/TMemFile.h is in libroot-io-dev 5.34.14-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Author: Philippe Canal, May 2011
/*************************************************************************
* Copyright (C) 1995-2009, Rene Brun and Fons Rademakers. *
* All rights reserved. *
* *
* For the licensing terms see $ROOTSYS/LICENSE. *
* For the list of contributors see $ROOTSYS/README/CREDITS. *
*************************************************************************/
#ifndef ROOT_TMemFile
#define ROOT_TMemFile
//////////////////////////////////////////////////////////////////////////
// //
// TMemFile //
// //
// A TMemFile is like a normal TFile except that it reads and writes //
// its data via in memory. //
// //
//////////////////////////////////////////////////////////////////////////
#ifndef ROOT_TFile
#include "TFile.h"
#endif
class TMemFile : public TFile {
private:
struct TMemBlock {
private:
TMemBlock(const TMemBlock&); // Not implemented
TMemBlock &operator=(const TMemBlock&); // Not implemented.
public:
TMemBlock();
TMemBlock(Long64_t size, TMemBlock *previous = 0);
~TMemBlock();
void CreateNext(Long64_t size);
TMemBlock *fPrevious;
TMemBlock *fNext;
UChar_t *fBuffer;
Long64_t fSize;
};
TMemBlock fBlockList; // Colletion of memory blocks of size fBlockSize
Long64_t fSize; // Total file size (sum of the size of the chunks)
Long64_t fSysOffset; // Seek offset in file
TMemBlock *fBlockSeek; // Pointer to the block we seeked to.
Long64_t fBlockOffset; // Seek offset within the block
static Long64_t fgDefaultBlockSize;
Long64_t MemRead(Int_t fd, void *buf, Long64_t len) const;
// Overload TFile interfaces.
Int_t SysOpen(const char *pathname, Int_t flags, UInt_t mode);
Int_t SysClose(Int_t fd);
Int_t SysRead(Int_t fd, void *buf, Int_t len);
Int_t SysWrite(Int_t fd, const void *buf, Int_t len);
Long64_t SysSeek(Int_t fd, Long64_t offset, Int_t whence);
Int_t SysStat(Int_t fd, Long_t *id, Long64_t *size, Long_t *flags, Long_t *modtime);
Int_t SysSync(Int_t fd);
void ResetObjects(TDirectoryFile *, TFileMergeInfo *) const;
TMemFile &operator=(const TMemFile&); // Not implemented.
public:
TMemFile(const char *name, Option_t *option="", const char *ftitle="", Int_t compress=1);
TMemFile(const char *name, char *buffer, Long64_t size, Option_t *option="", const char *ftitle="", Int_t compress=1);
TMemFile(const TMemFile &orig);
virtual ~TMemFile();
virtual Long64_t CopyTo(void *to, Long64_t maxsize) const;
virtual void CopyTo(TBuffer &tobuf) const;
virtual Long64_t GetSize() const;
void ResetAfterMerge(TFileMergeInfo *);
void ResetErrno() const;
virtual void Print(Option_t *option="") const;
ClassDef(TMemFile, 0) //A ROOT file that reads/writes via HDFS
};
#endif
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