# HG changeset patch
# User Daniel Holth <dholth@fastmail.fm>
# Date 1374330889 14400
# Node ID fe1516603ce99486427ffcc79e3552bd7739e75a
# Parent  e7305517260bdcb457ef6769587f97ea3a8c5d1d
remove zipfile._ZipDecryptor._GenerateCRCTable()

diff -r e7305517260b -r fe1516603ce9 Lib/zipfile.py
--- a/Lib/zipfile.py	Sat Jul 20 15:12:19 2013 +0200
+++ b/Lib/zipfile.py	Sat Jul 20 10:34:49 2013 -0400
@@ -457,29 +457,9 @@
         plain_text = map(zd, cypher_text)
     """
 
-    def _GenerateCRCTable():
-        """Generate a CRC-32 table.
-
-        ZIP encryption uses the CRC32 one-byte primitive for scrambling some
-        internal keys. We noticed that a direct implementation is faster than
-        relying on binascii.crc32().
-        """
-        poly = 0xedb88320
-        table = [0] * 256
-        for i in range(256):
-            crc = i
-            for j in range(8):
-                if crc & 1:
-                    crc = ((crc >> 1) & 0x7FFFFFFF) ^ poly
-                else:
-                    crc = ((crc >> 1) & 0x7FFFFFFF)
-            table[i] = crc
-        return table
-    crctable = _GenerateCRCTable()
-
     def _crc32(self, ch, crc):
         """Compute the CRC32 primitive on one byte."""
-        return ((crc >> 8) & 0xffffff) ^ self.crctable[(crc ^ ch) & 0xff]
+        return crc32(ch, crc) & 0xffffffff
 
     def __init__(self, pwd):
         self.key0 = 305419896