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"""SCons.Sig.MD5
The MD5 signature package for the SCons software construction
utility.
"""
#
# Copyright (c) 2001 Steven Knight
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import imp
import string
# Force Python to load the builtin "md5" module. If we do this with a
# normal import statement, then case-insensitive systems (Win32) get
# confused and thinks there's a case mismatch with *this* MD5.py module.
file, name, desc = imp.find_module('md5')
try:
md5 = imp.load_module('md5', file, name, desc)
finally:
if file:
file.close()
def current(new, old):
"""Return whether a new signature is up-to-date with
respect to an old signature.
"""
return new == old
def hexdigest(s):
"""Return a signature as a string of hex characters.
"""
# NOTE: This routine is a method in the Python 2.0 interface
# of the native md5 module, but we want SCons to operate all
# the way back to at least Python 1.5.2, which doesn't have it.
h = string.hexdigits
r = ''
for c in s:
i = ord(c)
r = r + h[(i >> 4) & 0xF] + h[i & 0xF]
return r
def collect(signatures):
"""
Collect a list of signatures into an aggregate signature.
signatures - a list of signatures
returns - the aggregate signature
"""
if len(signatures) == 1:
return signatures[0]
else:
contents = string.join(signatures, ', ')
return hexdigest(md5.new(contents).digest())
def signature(obj):
"""Generate a signature for an object
"""
try:
contents = str(obj.get_contents())
except AttributeError, e:
raise AttributeError, \
"unable to fetch contents of '%s': %s" % (str(obj), e)
return hexdigest(md5.new(contents).digest())
def to_string(signature):
"""Convert a signature to a string"""
return signature
def from_string(string):
"""Convert a string to a signature"""
return string
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