Thomas Lotze wrote:
> AIUI (and as a little experimenting seems to confirm), you can't
> reposition an iterator over an mmap'ed file by seeking. True, you have
> both iterating by characters and seeking/telling, but the two
> functionalities don't play together.
A quick and dirty hack!? Maybe i'm missing what it is that you need ...
class MmapWithSeekAndTell(object):
def __init__(self, m, size):
self._m = m
self._pos = 0
self._size = size-1
def __iter__(self):
return self
def next(self):
if self._pos < self._size-1:
self._pos += 1
return self._m[self._pos]
raise StopIteration
def seek(self, offset, whence=0):
if whence == 0 and 0 <= offset < self._size:
self._pos = offset
elif whence == 1 and 0 <= (self._pos + offset) < self._size:
self._pos += offset
elif whence == 2 and 0<= (self._size - offset) < self._size:
self._pos = self._size - offset
def tell(self):
return self._pos
HtH, Roland
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