1 files changed, 70 insertions, 0 deletions
diff --git a/src/scons/Sig/MD5.py b/src/scons/Sig/MD5.py
new file mode 100644
index 0000000..36e4230
--- /dev/null
+++ b/src/scons/Sig/MD5.py
@@ -0,0 +1,70 @@
+"""scons.Sig.MD5
+
+The MD5 signature package for the scons software construction
+utility.
+
+"""
+
+__revision__ = "Sig/MD5.py __REVISION__ __DATE__ __DEVELOPER__"
+
+import md5
+import string
+
+
+
+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 _init():
+    pass	# XXX
+
+def _end():
+    pass	# XXX
+
+def current(obj, sig):
+    """Return whether a given object is up-to-date with the
+    specified signature.
+    """
+    return obj.signature() == sig
+
+def set():
+    pass	# XXX
+
+def invalidate():
+    pass	# XXX
+
+def collect(*objects):
+    """Collect signatures from a list of objects, returning the
+    aggregate signature of the list.
+    """
+    if len(objects) == 1:
+	sig = objects[0].signature()
+    else:
+	contents = string.join(map(lambda o: o.signature(), objects), ', ')
+	sig = signature(contents)
+#    if debug:
+#	pass
+    return sig
+
+def signature(contents):
+    """Generate a signature for a byte string.
+    """
+    return hexdigest(md5.new(contents).digest())
+
+def cmdsig():
+    pass	# XXX
+
+def srcsig():
+    pass	# XXX