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