MmapByteArray Class Reference

Inheritance diagram for MmapByteArray:

Public Member Functions
def	__init__ (self, source, bytelength=None, byteoffset=None)
def	__getitem__ (self, key)
def	__len__ (self)

Public Attributes
	source
	filelength
	byteoffset
	bytelength
	filemap

Static Private Attributes
tuple	__slots__ = ('filemap', 'filelength', 'source', 'byteoffset', 'bytelength')

Detailed Description

Looks like a bytearray, but from an mmap.

Not part of public interface.

Definition at line 396 of file bitstring.py.

Constructor & Destructor Documentation

__init__()

def __init__	(		self,
			source,
			bytelength = None,
			byteoffset = None
	)

Definition at line 404 of file bitstring.py.

    def __init__(self, source, bytelength=None, byteoffset=None):
        self.source = source
        source.seek(0, os.SEEK_END)
        self.filelength = source.tell()
        if byteoffset is None:
            byteoffset = 0
        if bytelength is None:
            bytelength = self.filelength - byteoffset
        self.byteoffset = byteoffset
        self.bytelength = bytelength
        self.filemap = mmap.mmap(source.fileno(), 0, access=mmap.ACCESS_READ)
 

Member Function Documentation

__getitem__()

def __getitem__	(		self,
			key
	)

Definition at line 416 of file bitstring.py.

    def __getitem__(self, key):
        try:
            start = key.start
            stop = key.stop
        except AttributeError:
            try:
                assert 0 <= key < self.bytelength
                return ord(self.filemap[key + self.byteoffset])
            except TypeError:
                # for Python 3
                return self.filemap[key + self.byteoffset]
        else:
            if start is None:
                start = 0
            if stop is None:
                stop = self.bytelength
            assert key.step is None
            assert 0 <= start < self.bytelength
            assert 0 <= stop <= self.bytelength
            s = slice(start + self.byteoffset, stop + self.byteoffset)
            return bytearray(self.filemap.__getitem__(s))
 

__len__()

def __len__

(

self

)

Definition at line 438 of file bitstring.py.

    def __len__(self):
        return self.bytelength
 
 
# This creates a dictionary for every possible byte with the value being
# the key with its bits reversed.

Member Data Documentation

__slots__

tuple __slots__ = ('filemap', 'filelength', 'source', 'byteoffset', 'bytelength')

staticprivate

Definition at line 402 of file bitstring.py.

bytelength

bytelength

Definition at line 413 of file bitstring.py.

byteoffset

byteoffset

Definition at line 412 of file bitstring.py.

filelength

filelength

Definition at line 407 of file bitstring.py.

filemap

filemap

Definition at line 414 of file bitstring.py.

source

source

Definition at line 405 of file bitstring.py.

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

• trg/scripts/bitstring.py