ROOT::Experimental::Internal::RMiniFileReader Class Reference

Read RNTuple data blocks from a TFile container, provided by a RRawFile.

A RRawFile is used for the byte access. The class implements a minimal subset of TFile, enough to extract RNTuple data keys.

Definition at line 108 of file RMiniFile.hxx.

Public Member Functions
	RMiniFileReader ()=default
	RMiniFileReader (ROOT::Internal::RRawFile *rawFile)
	Uses the given raw file to read byte ranges.
RResult< RNTuple >	GetNTuple (std::string_view ntupleName)
	Extracts header and footer location for the RNTuple identified by ntupleName.
void	ReadBuffer (void *buffer, size_t nbytes, std::uint64_t offset)
	Reads a given byte range from the file into the provided memory buffer.

Private Member Functions
RResult< RNTuple >	GetNTupleBare (std::string_view ntupleName)
	Used when the file container turns out to be a bare file.
RResult< RNTuple >	GetNTupleProper (std::string_view ntupleName)
	Used when the file turns out to be a TFile container.

Private Attributes
bool	fIsBare = false
	Indicates whether the file is a TFile container or an RNTuple bare file.
ROOT::Internal::RRawFile *	fRawFile = nullptr
	The raw file used to read byte ranges.

#include <ROOT/RMiniFile.hxx>

Constructor & Destructor Documentation

RMiniFileReader() [1/2]

ROOT::Experimental::Internal::RMiniFileReader::RMiniFileReader ( )

default

RMiniFileReader() [2/2]

ROOT::Experimental::Internal::RMiniFileReader::RMiniFileReader ( ROOT::Internal::RRawFile *  rawFile )

explicit

Uses the given raw file to read byte ranges.

Definition at line 917 of file RMiniFile.cxx.

Member Function Documentation

GetNTuple()

ROOT::Experimental::RResult< ROOT::Experimental::RNTuple > ROOT::Experimental::Internal::RMiniFileReader::GetNTuple

(

std::string_view

ntupleName

)

Extracts header and footer location for the RNTuple identified by ntupleName.

Definition at line 923 of file RMiniFile.cxx.

GetNTupleBare()

ROOT::Experimental::RResult< ROOT::Experimental::RNTuple > ROOT::Experimental::Internal::RMiniFileReader::GetNTupleBare ( std::string_view  ntupleName )

private

Used when the file container turns out to be a bare file.

Definition at line 991 of file RMiniFile.cxx.

GetNTupleProper()

ROOT::Experimental::RResult< ROOT::Experimental::RNTuple > ROOT::Experimental::Internal::RMiniFileReader::GetNTupleProper ( std::string_view  ntupleName )

private

Used when the file turns out to be a TFile container.

Definition at line 935 of file RMiniFile.cxx.

ReadBuffer()

void ROOT::Experimental::Internal::RMiniFileReader::ReadBuffer	(	void *	buffer,
		size_t	nbytes,
		std::uint64_t	offset
	)

Reads a given byte range from the file into the provided memory buffer.

Definition at line 1013 of file RMiniFile.cxx.

Member Data Documentation

fIsBare

bool ROOT::Experimental::Internal::RMiniFileReader::fIsBare = false

private

Indicates whether the file is a TFile container or an RNTuple bare file.

Definition at line 113 of file RMiniFile.hxx.

fRawFile

ROOT::Internal::RRawFile* ROOT::Experimental::Internal::RMiniFileReader::fRawFile = nullptr

private

The raw file used to read byte ranges.

Definition at line 111 of file RMiniFile.hxx.

Libraries for ROOT::Experimental::Internal::RMiniFileReader:

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The documentation for this class was generated from the following files:

• tree/ntuple/v7/inc/ROOT/RMiniFile.hxx
• tree/ntuple/v7/src/RMiniFile.cxx