Aifc comptype write fix

[OlegPlakhotnyuk]

BPO	13680
Nosy	@ezio-melotti, @bitdancer, @sandrotosi
Files	aifc_comptypes.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2012-01-01.17:07:42.206>
created_at = <Date 2011-12-30.09:23:34.920>
labels = ['tests', 'type-bug', 'library']
title = 'Aifc comptype write fix'
updated_at = <Date 2012-01-01.17:07:42.205>
user = 'https://bugs.python.org/OlegPlakhotnyuk'

bugs.python.org fields:

activity = <Date 2012-01-01.17:07:42.205>
actor = 'sandro.tosi'
assignee = 'none'
closed = True
closed_date = <Date 2012-01-01.17:07:42.206>
closer = 'sandro.tosi'
components = ['Library (Lib)', 'Tests']
creation = <Date 2011-12-30.09:23:34.920>
creator = 'Oleg.Plakhotnyuk'
dependencies = []
files = ['24110']
hgrepos = []
issue_num = 13680
keywords = ['patch']
message_count = 2.0
messages = ['150365', '150433']
nosy_count = 5.0
nosy_names = ['ezio.melotti', 'r.david.murray', 'sandro.tosi', 'python-dev', 'Oleg.Plakhotnyuk']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue13680'
versions = ['Python 3.2', 'Python 3.3']

[OlegPlakhotnyuk]

Two changes have been made to the library:

1. Lowercase compression type support have been added to the sample width validation routine during write operation. Everywhere else compression types are used in both lowercase and uppercase.
2. Redundant invalid compression type check has been removed. It cannot be executed using public module interface, therefore I think it is not necessary.

[python-dev]

New changeset a9cdc3ff2b8e by Sandro Tosi in branch '3.2':
Issue bpo-13680: add lowecase compression type to write header; patch by Oleg Plakhotnyuk
http://hg.python.org/cpython/rev/a9cdc3ff2b8e