Simple performance optimizations

diff --git a/pyderasn.py b/pyderasn.py
index 84f1bc749df01626694682b635281f53e8483b90..aa9f60c486fb973a09b0ce6e3b532240a079bfc0 100755 (executable)
--- a/pyderasn.py
+++ b/pyderasn.py
@@ -1520,6 +1520,8 @@ def len_decode(data):
     return l, 1 + octets_num, data[1 + octets_num:]
 
 
+LEN0 = len_encode(0)
+LEN1 = len_encode(1)
 LEN1K = len_encode(1000)
 
 
@@ -2460,11 +2462,7 @@ class Boolean(Obj):
 
     def _encode(self):
         self._assert_ready()
-        return b"".join((
-            self.tag,
-            len_encode(1),
-            (b"\xFF" if self._value else b"\x00"),
-        ))
+        return b"".join((self.tag, LEN1, (b"\xFF" if self._value else b"\x00")))
 
     def _decode(self, tlv, offset, decode_path, ctx, tag_only, evgen_mode):
         try:
@@ -3987,7 +3985,7 @@ class Null(Obj):
         )
 
     def _encode(self):
-        return self.tag + len_encode(0)
+        return self.tag + LEN0
 
     def _decode(self, tlv, offset, decode_path, ctx, tag_only, evgen_mode):
         try:
@@ -4783,8 +4781,11 @@ class IA5String(CommonString):
 
 
 LEN_YYMMDDHHMMSSZ = len("YYMMDDHHMMSSZ")
+LEN_LEN_YYMMDDHHMMSSZ = len_encode(LEN_YYMMDDHHMMSSZ)
+LEN_YYMMDDHHMMSSZ_WITH_LEN = len(LEN_LEN_YYMMDDHHMMSSZ) + LEN_YYMMDDHHMMSSZ
 LEN_YYYYMMDDHHMMSSDMZ = len("YYYYMMDDHHMMSSDMZ")
 LEN_YYYYMMDDHHMMSSZ = len("YYYYMMDDHHMMSSZ")
+LEN_LEN_YYYYMMDDHHMMSSZ = len_encode(LEN_YYYYMMDDHHMMSSZ)
 
 
 class VisibleString(CommonString):
@@ -5014,8 +5015,7 @@ class UTCTime(VisibleString):
 
     def _encode(self):
         self._assert_ready()
-        value = self._encode_time()
-        return b"".join((self.tag, len_encode(len(value)), value))
+        return b"".join((self.tag, LEN_LEN_YYMMDDHHMMSSZ, self._encode_time()))
 
     def _encode_cer(self, writer):
         write_full(writer, self._encode())
@@ -5181,6 +5181,14 @@ class GeneralizedTime(UTCTime):
             encoded += (".%06d" % value.microsecond).rstrip("0")
         return (encoded + "Z").encode("ascii")
 
+    def _encode(self):
+        self._assert_ready()
+        value = self._value
+        if value.microsecond > 0:
+            encoded = self._encode_time()
+            return b"".join((self.tag, len_encode(len(encoded)), encoded))
+        return b"".join((self.tag, LEN_LEN_YYYYMMDDHHMMSSZ, self._encode_time()))
+
 
 class GraphicString(CommonString):
     __slots__ = ()