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"""SCons.Sig.MD5
The MD5 signature package for the SCons software construction
utility.
"""
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import md5
import string
def current(obj, sig):
"""Return whether a given object is up-to-date with the
specified signature.
"""
return obj.get_signature() == sig
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
"""
return hexdigest(md5.new(obj.get_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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