Lines Matching refs:signature
194 # The PNG signature.
195 # http://www.w3.org/TR/PNG/#5PNG-file-signature
671 # http://www.w3.org/TR/PNG/#5PNG-file-signature
1352 self.signature = None
1690 """If signature (header) has not been read then read and
1694 if self.signature:
1696 self.signature = self.file.read(8)
1697 if self.signature != _signature:
1698 raise FormatError("PNG file has invalid signature.")
2802 """Test file containing just signature bytes."""