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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 CircularBuffer

buf = CircularBuffer(1024)

buf.write(b’some text’)
while len(buf) > 0:
buf.read(1)

from re import match

buf.write(b’hallo’)

# python2
with buf:
match(br’^ha’, buf)

# python3
match(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().

Project details


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