Support WebP image format detection in imghdr module

[akhenakh]

BPO	20197
Nosy	@gpshead, @PCManticore, @berkerpeksag, @serhiy-storchaka
Files	imghdr_webp.patch issue20197.patch issue20197_v1.patch: Add comma for cleaner future patches. issue20197_v2.patch: Add versionchanged.

^{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 = 'https://github.com/serhiy-storchaka'
closed_at = <Date 2014-05-25.09:31:55.486>
created_at = <Date 2014-01-08.21:38:19.381>
labels = ['type-feature', 'library']
title = 'Support WebP image format detection in imghdr module'
updated_at = <Date 2014-05-25.09:31:55.484>
user = 'https://bugs.python.org/akhenakh'

bugs.python.org fields:

activity = <Date 2014-05-25.09:31:55.484>
actor = 'serhiy.storchaka'
assignee = 'serhiy.storchaka'
closed = True
closed_date = <Date 2014-05-25.09:31:55.486>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2014-01-08.21:38:19.381>
creator = 'akhenakh'
dependencies = []
files = ['33366', '34338', '34341', '34344']
hgrepos = []
issue_num = 20197
keywords = ['patch']
message_count = 5.0
messages = ['207702', '208646', '213074', '219076', '219077']
nosy_count = 7.0
nosy_names = ['gregory.p.smith', 'Claudiu.Popa', 'python-dev', 'berker.peksag', 'serhiy.storchaka', 'xcombelle', 'akhenakh']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue20197'
versions = ['Python 3.5']

[akhenakh]

Detect the webp file format (RIFF container + WEBP), return webp as format detected.

[serhiy-storchaka]

LGTM. Detecting function matches the WebP specification [1].

[1] https://developers.google.com/speed/webp/docs/riff_container#webp-file-header

[PCManticore]

Thanks for your patch, Fabrice!

I've uploaded a change to your patch, by adding a .webp test file and adding the .webp format in imghdr's test suite.

[python-dev]

New changeset 4fd17e28d4bf by Serhiy Storchaka in branch 'default':
Issue bpo-20197: Added support for the WebP image type in the imghdr module.
http://hg.python.org/cpython/rev/4fd17e28d4bf

[serhiy-storchaka]

Thank you for your contribution Fabrice and Claudiu.