94 lines
3 KiB
Python
94 lines
3 KiB
Python
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"""SCons.Sig.MD5
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The MD5 signature package for the SCons software construction
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utility.
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"""
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#
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# Copyright (c) 2001, 2002, 2003, 2004 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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__revision__ = "/home/scons/scons/branch.0/baseline/src/engine/SCons/Sig/MD5.py 0.96.1.D001 2004/08/23 09:55:29 knight"
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import imp
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import string
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# Force Python to load the builtin "md5" module. If we do this with a
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# normal import statement, then case-insensitive systems (Win32) get
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# confused and thinks there's a case mismatch with *this* MD5.py module.
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file, name, desc = imp.find_module('md5')
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try:
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md5 = imp.load_module('md5', file, name, desc)
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finally:
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if file:
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file.close()
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def current(new, old):
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"""Return whether a new signature is up-to-date with
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respect to an old signature.
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"""
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return new == old
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def hexdigest(s):
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"""Return a signature as a string of hex characters.
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"""
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# NOTE: This routine is a method in the Python 2.0 interface
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# of the native md5 module, but we want SCons to operate all
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# the way back to at least Python 1.5.2, which doesn't have it.
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h = string.hexdigits
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r = ''
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for c in s:
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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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def collect(signatures):
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"""
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Collect a list of signatures into an aggregate signature.
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signatures - a list of signatures
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returns - the aggregate signature
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"""
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if len(signatures) == 1:
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return signatures[0]
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else:
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contents = string.join(signatures, ', ')
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return hexdigest(md5.new(contents).digest())
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def signature(obj):
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"""Generate a signature for an object
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"""
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try:
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gc = obj.get_contents
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except AttributeError:
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raise AttributeError, "unable to fetch contents of '%s'" % str(obj)
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return hexdigest(md5.new(str(gc())).digest())
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def to_string(signature):
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"""Convert a signature to a string"""
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return signature
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def from_string(string):
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"""Convert a string to a signature"""
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return string
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