MmapByteArray Class Reference

Inheritance diagram for MmapByteArray:

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

Public Attributes
	source = source
	filelength = source.tell()
	byteoffset = byteoffset
	bytelength = bytelength
	filemap = mmap.mmap(source.fileno(), 0, access=mmap.ACCESS_READ)

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__()

__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__()

__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__()

__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 = bytelength

Definition at line 413 of file bitstring.py.

byteoffset

byteoffset = byteoffset

Definition at line 412 of file bitstring.py.

filelength

filelength = source.tell()

Definition at line 407 of file bitstring.py.

filemap

filemap = mmap.mmap(source.fileno(), 0, access=mmap.ACCESS_READ)

Definition at line 414 of file bitstring.py.

source

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