2 # Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 The SCons Foundation
4 # Permission is hereby granted, free of charge, to any person obtaining
5 # a copy of this software and associated documentation files (the
6 # "Software"), to deal in the Software without restriction, including
7 # without limitation the rights to use, copy, modify, merge, publish,
8 # distribute, sublicense, and/or sell copies of the Software, and to
9 # permit persons to whom the Software is furnished to do so, subject to
10 # the following conditions:
12 # The above copyright notice and this permission notice shall be included
13 # in all copies or substantial portions of the Software.
15 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
16 # KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
17 # WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18 # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
19 # LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
20 # OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 hashlib backwards-compatibility module for older (pre-2.5) Python versions
27 This does not not NOT (repeat, *NOT*) provide complete hashlib
28 functionality. It only wraps the portions of MD5 functionality used
29 by SCons, in an interface that looks like hashlib (or enough for our
30 purposes, anyway). In fact, this module will raise an ImportError if
31 the underlying md5 module isn't available.
34 __revision__ = "src/engine/SCons/compat/_scons_hashlib.py 3842 2008/12/20 22:59:52 scons"
43 def __init__(self, name, string=''):
44 if not name in ('MD5', 'md5'):
45 raise ValueError, "unsupported hash type"
47 self.m = self.md5_module.md5()
50 return '<%s HASH object @ %#x>' % (self.name, id(self))
54 result = copy.copy(self)
55 result.m = self.m.copy()
59 return self.m.digest()
61 def update(self, arg):
62 return self.m.update(arg)
64 if hasattr(md5.md5(), 'hexdigest'):
67 return self.m.hexdigest()
71 # Objects created by the underlying md5 module have no native
72 # hexdigest() method (*cough* 1.5.2 *cough*), so provide an
73 # equivalent lifted from elsewhere.
77 for c in self.digest():
79 r = r + h[(i >> 4) & 0xF] + h[i & 0xF]
85 return md5obj('md5', string)