mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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72 lines
2.5 KiB
Python
72 lines
2.5 KiB
Python
#!/usr/bin/env python
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# Copyright (C) 2005, 2006, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
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# Copyright (C) 2006 Anders Carlsson <andersca@mac.com>
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# Copyright (C) 2006, 2007 Samuel Weinig <sam@webkit.org>
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# Copyright (C) 2006 Alexey Proskuryakov <ap@webkit.org>
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# Copyright (C) 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
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# Copyright (C) 2009 Cameron McCormack <cam@mcc.id.au>
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# Copyright (C) Research In Motion Limited 2010. All rights reserved.
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# Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
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# Copyright (C) 2011 Patrick Gansterer <paroga@webkit.org>
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# Copyright (C) 2012 Ericsson AB. All rights reserved.
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Library General Public
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# License as published by the Free Software Foundation; either
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# version 2 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Library General Public License for more details.
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#
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# You should have received a copy of the GNU Library General Public License
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# along with this library; see the file COPYING.LIB. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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# Boston, MA 02110-1301, USA.
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def stringHash(str):
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# Implements Paul Hsieh's SuperFastHash - http://www.azillionmonkeys.com/qed/hash.html
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# LChar data is interpreted as Latin-1-encoded (zero extended to 16 bits).
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stringHashingStartValue = 0x9E3779B9
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twoTo32 = 4294967296
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hash = stringHashingStartValue
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strLength = len(str)
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characterPairs = int(strLength / 2)
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remainder = strLength & 1
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# Main loop
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while characterPairs > 0:
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hash = hash + ord(str[0])
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tmp = (ord(str[1]) << 11) ^ hash
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hash = ((hash << 16) % twoTo32) ^ tmp
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str = str[2:]
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hash = hash + (hash >> 11)
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hash = hash % twoTo32
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characterPairs = characterPairs - 1
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# Handle end case
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if remainder:
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hash = hash + ord(str[0])
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hash = hash ^ ((hash << 11) % twoTo32)
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hash = hash + (hash >> 17)
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hash = hash ^ (hash << 3)
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hash = hash + (hash >> 5)
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hash = hash % twoTo32
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hash = hash ^ ((hash << 2) % twoTo32)
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hash = hash + (hash >> 15)
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hash = hash % twoTo32
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hash = hash ^ ((hash << 10) % twoTo32)
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hash = hash & 0xffffff
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if not hash:
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hash = 0x800000
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return hash
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