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Unified Diff: grit/extern/FP.py

Issue 7994004: Initial source commit to grit-i18n project. (Closed) Base URL: http://grit-i18n.googlecode.com/svn/trunk/
Patch Set: Created 9 years, 3 months ago
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Index: grit/extern/FP.py
===================================================================
--- grit/extern/FP.py (revision 0)
+++ grit/extern/FP.py (revision 0)
@@ -0,0 +1,34 @@
+#!/usr/bin/python
+# Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+try:
+ import hashlib
+ _new_md5 = hashlib.md5
+except ImportError:
+ import md5
+ _new_md5 = md5.new
+
+"""64-bit fingerprint support for strings.
+
+Usage:
+ from extern import FP
+ print 'Fingerprint is %ld' % FP.FingerPrint('Hello world!')
+"""
+
+
+def UnsignedFingerPrint(str, encoding='utf-8'):
+ """Generate a 64-bit fingerprint by taking the first half of the md5
+ of the string."""
+ hex128 = _new_md5(str).hexdigest()
+ int64 = long(hex128[:16], 16)
+ return int64
+
+def FingerPrint(str, encoding='utf-8'):
+ fp = UnsignedFingerPrint(str, encoding=encoding)
+ # interpret fingerprint as signed longs
+ if fp & 0x8000000000000000L:
+ fp = - ((~fp & 0xFFFFFFFFFFFFFFFFL) + 1)
+ return fp
+
Property changes on: grit/extern/FP.py
___________________________________________________________________
Added: svn:eol-style
+ LF
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