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fallback: add some comments to _fb_read

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Bas Westerbaan 2014-06-14 18:34:17 +02:00
parent 7eb371f827
commit 952eb9fc53
1 changed files with 4 additions and 0 deletions
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4
msgpack/fallback.py
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@ -252,11 +252,15 @@ class Unpacker(object):
def _fb_read(self, n, write_bytes=None):
buffs = self._fb_buffers
# We have a redundant codepath for the most common case, such that
# pypy optimizes it properly. This is the case that the read fits
# in the current buffer.
if (write_bytes is None and self._fb_buf_i < len(buffs) and
self._fb_buf_o + n < len(buffs[self._fb_buf_i])):
self._fb_buf_o += n
return buffs[self._fb_buf_i][self._fb_buf_o - n:self._fb_buf_o]
# The remaining cases.
ret = b''
while len(ret) != n:
if self._fb_buf_i == len(buffs):