Simple implementation of circular buffer.
Project description
License : MIT
Summary
Simple circular buffer written in python extension.
CircularBuffer will allocate requested size + 2 bytes for two sections of null terminated strings.
May temporary allocate another half of the allocated bytes if you used buffer protocol, I mostly used them for regex.
WARNING: current implementation doesn’t expect data with char 0, or char ‘0’.
Installation
Simply pip install pycircularbuffer, compilation from downloaded source is probably needed.
Using
from circularbuffer import CircularBufferbuf = CircularBuffer(1024)buf.write(b’some text’)while len(buf) > 0:buf.read(1)from re import matchbuf.write(b’hallo’)# python2with buf:match(br’^ha’, buf)# python3match(br’^ha’, buf)
API
Regular methods:
clear()
read()
resize()
write()
write_available()
make_contiguous()
String methods:
count()
startswith()
Sequence methods:
__contains__()
__getitem__()
__len__()
__setitem__()
Magic methods:
__repr__()
__str__()
Note: while string representation makes thing easier it always creates memory copy.
__enter__()
__exit__()
Buffer protocol:
Note: for python version < 3, you need to use context manager, the with statement, to let CircularBuffer know when you are releasing the buffer.
Using buffer protocol will throw ReservedError exception for CircularBuffer.read().
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