Use zlib's crc32 routine instead of binascii when available. zlib's is faster
when compiled properly optimized and about the same speed otherwise.
diff --git a/Lib/zipfile.py b/Lib/zipfile.py
index 9f5669e..b601e74 100644
--- a/Lib/zipfile.py
+++ b/Lib/zipfile.py
@@ -6,8 +6,10 @@
try:
import zlib # We may need its compression method
+ crc32 = zlib.crc32
except ImportError:
zlib = None
+ crc32 = binascii.crc32
__all__ = ["BadZipfile", "error", "ZIP_STORED", "ZIP_DEFLATED", "is_zipfile",
"ZipInfo", "ZipFile", "PyZipFile", "LargeZipFile" ]
@@ -940,7 +942,7 @@
if not buf:
break
file_size = file_size + len(buf)
- CRC = binascii.crc32(buf, CRC)
+ CRC = crc32(buf, CRC)
if cmpr:
buf = cmpr.compress(buf)
compress_size = compress_size + len(buf)
@@ -983,7 +985,7 @@
zinfo.header_offset = self.fp.tell() # Start of header bytes
self._writecheck(zinfo)
self._didModify = True
- zinfo.CRC = binascii.crc32(bytes) # CRC-32 checksum
+ zinfo.CRC = crc32(bytes) # CRC-32 checksum
if zinfo.compress_type == ZIP_DEFLATED:
co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
zlib.DEFLATED, -15)
@@ -1041,7 +1043,7 @@
if extra:
# Append a ZIP64 field to the extra's
extra_data = struct.pack(
- '<hh' + 'q'*len(extra),
+ '<HH' + 'Q'*len(extra),
1, 8*len(extra), *extra) + extra_data
extract_version = max(45, zinfo.extract_version)