RawRootFile Class Reference

Classes
class	Key

Public Member Functions
def	__init__ (self, filename)
def	__del__ (self)
def	normalize (self, end=None, seekfree=None, nbytesfree=None, nbytesname=None, seekinfo=None)
def	__iter__ (self)
def	__next__ (self)

Public Attributes
	rootfile
	binary root file
	version
	root/file format version
	large
	are file location pointers 4 or 8 bits?
	wordlen
	size of file location pointers
	begin
	pointer to first data record
	end
	pointer to first free word at the EOF
	seekfree
	pointer to FREE data record
	nbytesfree
	number of bytes in FREE data record
	nfree
	number of free data records
	nbytesname
	number of bytes in TNamed at creation time
	units
	number of bytes for file pointers
	compress
	compression level and algorithm
	seekinfo
	pointer to TStreamerInfo record
	nbytesinfo
	number of bytes in TStreamerInfo record
	uuid
	universal unique ID
	header
	binary header
	seekkeys
	pointer to KeysList record

Detailed Description

Interface to binary root file content

Definition at line 14 of file b2root.py.

Constructor & Destructor Documentation

__init__()

def __init__	(		self,
			filename
	)

Open a root file and read its header

Definition at line 19 of file b2root.py.

    def __init__(self, filename):
        """
        Open a root file and read its header
        """
 
        
        self.rootfile = open(filename, 'rb')
        root = self.rootfile.read(4)
        if root != b'root':
            raise Exception("%s is not a root file" % filename)
        
        self.version = int.from_bytes(self.rootfile.read(4), byteorder)
        
        self.large = (self.version >= 1000000)
        
        self.wordlen = 8 if self.large else 4
        
        self.begin = int.from_bytes(self.rootfile.read(4), byteorder)
        
        self.end = int.from_bytes(self.rootfile.read(self.wordlen), byteorder)
        
        self.seekfree = int.from_bytes(self.rootfile.read(self.wordlen), byteorder)
        
        self.nbytesfree = int.from_bytes(self.rootfile.read(4), byteorder)
        
        self.nfree = int.from_bytes(self.rootfile.read(4), byteorder)
        
        self.nbytesname = int.from_bytes(self.rootfile.read(4), byteorder)
        
        self.units = int.from_bytes(self.rootfile.read(1), byteorder)
        
        self.compress = int.from_bytes(self.rootfile.read(4), byteorder)
        
        self.seekinfo = int.from_bytes(self.rootfile.read(self.wordlen), byteorder)
        
        self.nbytesinfo = int.from_bytes(self.rootfile.read(self.wordlen), byteorder)
        
        self.uuid = self.rootfile.read(18)
        self.rootfile.seek(0)
        
        self.header = self.rootfile.read(self.begin)
        self.rootfile.seek(self.begin)
        
        self.seekkeys = 0
 

__del__()

def __del__

(

self

)

Close file

Definition at line 64 of file b2root.py.

Member Function Documentation

__iter__()

def __iter__

(

self

)

iterator interface

Definition at line 105 of file b2root.py.

__next__()

def __next__

(

self

)

Iterate to next key

Definition at line 203 of file b2root.py.

normalize()

def normalize	(		self,
			end = None,
			seekfree = None,
			nbytesfree = None,
			nbytesname = None,
			seekinfo = None
	)

Set UUID to zero and adjust pointers that are given as arguments

Definition at line 72 of file b2root.py.

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

• framework/scripts/B2Tools/b2root.py