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Fix the struct module DeprecationWarnings that zipfile was triggering by 

removing all use of signed struct values.

test_zipfile and test_zipfile64 pass.  no more warnings.
This commit is contained in:
Gregory P. Smith 2008-03-19 03:14:41 +00:00
parent 14cae96fa6
commit bf02e3bb21
1 changed files with 37 additions and 27 deletions
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48
Lib/zipfile.py
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@ -36,13 +36,13 @@ ZIP_DEFLATED = 8
# Here are some struct module formats for reading headers
structEndArchive = "<4s4H2LH" # 9 items, end of archive, 22 bytes
stringEndArchive = "PK\005\006" # magic number for end of archive record
structCentralDir = "<4s4B4HlLL5HLL"# 19 items, central directory, 46 bytes
structCentralDir = "<4s4B4HLLL5HLL"# 19 items, central directory, 46 bytes
stringCentralDir = "PK\001\002" # magic number for central directory
structFileHeader = "<4s2B4HlLL2H" # 12 items, file header record, 30 bytes
structFileHeader = "<4s2B4HLLL2H" # 12 items, file header record, 30 bytes
stringFileHeader = "PK\003\004" # magic number for file header
structEndArchive64Locator = "<4slql" # 4 items, locate Zip64 header, 20 bytes
structEndArchive64Locator = "<4sLQL" # 4 items, locate Zip64 header, 20 bytes
stringEndArchive64Locator = "PK\x06\x07" # magic token for locator header
structEndArchive64 = "<4sqhhllqqqq" # 10 items, end of archive (Zip64), 56 bytes
structEndArchive64 = "<4sQHHLLQQQQ" # 10 items, end of archive (Zip64), 56 bytes
stringEndArchive64 = "PK\x06\x06" # magic token for Zip64 header
@ -140,7 +140,7 @@ def _EndRecData(fpin):
endrec = list(endrec)
endrec.append("") # Append the archive comment
endrec.append(filesize - 22) # Append the record start offset
if endrec[-4] == -1 or endrec[-4] == 0xffffffff:
if endrec[-4] == 0xffffffff:
return _EndRecData64(fpin, -22, endrec)
return endrec
# Search the last END_BLOCK bytes of the file for the record signature.
@ -160,7 +160,7 @@ def _EndRecData(fpin):
# Append the archive comment and start offset
endrec.append(comment)
endrec.append(filesize - END_BLOCK + start)
if endrec[-4] == -1 or endrec[-4] == 0xffffffff:
if endrec[-4] == 0xffffffff:
return _EndRecData64(fpin, - END_BLOCK + start, endrec)
return endrec
return # Error, return None
@ -247,7 +247,7 @@ class ZipInfo (object):
if file_size > ZIP64_LIMIT or compress_size > ZIP64_LIMIT:
# File is larger than what fits into a 4 byte integer,
# fall back to the ZIP64 extension
fmt = '<hhqq'
fmt = '<HHQQ'
extra = extra + struct.pack(fmt,
1, struct.calcsize(fmt)-4, file_size, compress_size)
file_size = 0xffffffff # -1
@ -267,14 +267,14 @@ class ZipInfo (object):
extra = self.extra
unpack = struct.unpack
while extra:
tp, ln = unpack('<hh', extra[:4])
tp, ln = unpack('<HH', extra[:4])
if tp == 1:
if ln >= 24:
counts = unpack('<qqq', extra[4:28])
counts = unpack('<QQQ', extra[4:28])
elif ln == 16:
counts = unpack('<qq', extra[4:20])
counts = unpack('<QQ', extra[4:20])
elif ln == 8:
counts = unpack('<q', extra[4:12])
counts = unpack('<Q', extra[4:12])
elif ln == 0:
counts = ()
else:
@ -283,7 +283,8 @@ class ZipInfo (object):
idx = 0
# ZIP64 extension (large files and/or large archives)
if self.file_size == -1 or self.file_size == 0xFFFFFFFFL:
# XXX Is this correct? won't this exclude 2**32-1 byte files?
if self.file_size in (0xffffffffffffffffL, 0xffffffffL):
self.file_size = counts[idx]
idx += 1
@ -942,7 +943,7 @@ class ZipFile:
if not buf:
break
file_size = file_size + len(buf)
CRC = crc32(buf, CRC)
CRC = crc32(buf, CRC) & 0xffffffff
if cmpr:
buf = cmpr.compress(buf)
compress_size = compress_size + len(buf)
@ -960,7 +961,7 @@ class ZipFile:
# Seek backwards and write CRC and file sizes
position = self.fp.tell() # Preserve current position in file
self.fp.seek(zinfo.header_offset + 14, 0)
self.fp.write(struct.pack("<lLL", zinfo.CRC, zinfo.compress_size,
self.fp.write(struct.pack("<LLL", zinfo.CRC, zinfo.compress_size,
zinfo.file_size))
self.fp.seek(position, 0)
self.filelist.append(zinfo)
@ -985,7 +986,7 @@ class ZipFile:
zinfo.header_offset = self.fp.tell() # Start of header bytes
self._writecheck(zinfo)
self._didModify = True
zinfo.CRC = crc32(bytes) # CRC-32 checksum
zinfo.CRC = crc32(bytes) & 0xffffffff # CRC-32 checksum
if zinfo.compress_type == ZIP_DEFLATED:
co = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION,
zlib.DEFLATED, -15)
@ -1035,7 +1036,7 @@ class ZipFile:
if zinfo.header_offset > ZIP64_LIMIT:
extra.append(zinfo.header_offset)
header_offset = -1 # struct "l" format: 32 one bits
header_offset = 0xffffffffL # -1 32 bit
else:
header_offset = zinfo.header_offset
@ -1052,6 +1053,7 @@ class ZipFile:
extract_version = zinfo.extract_version
create_version = zinfo.create_version
try:
centdir = struct.pack(structCentralDir,
stringCentralDir, create_version,
zinfo.create_system, extract_version, zinfo.reserved,
@ -1060,6 +1062,16 @@ class ZipFile:
len(zinfo.filename), len(extra_data), len(zinfo.comment),
0, zinfo.internal_attr, zinfo.external_attr,
header_offset)
except DeprecationWarning:
print >>sys.stderr, (structCentralDir,
stringCentralDir, create_version,
zinfo.create_system, extract_version, zinfo.reserved,
zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
zinfo.CRC, compress_size, file_size,
len(zinfo.filename), len(extra_data), len(zinfo.comment),
0, zinfo.internal_attr, zinfo.external_attr,
header_offset)
raise
self.fp.write(centdir)
self.fp.write(zinfo.filename)
self.fp.write(extra_data)
@ -1079,10 +1091,8 @@ class ZipFile:
stringEndArchive64Locator, 0, pos2, 1)
self.fp.write(zip64locrec)
# XXX Why is `pos3` computed next? It's never referenced.
pos3 = self.fp.tell()
endrec = struct.pack(structEndArchive, stringEndArchive,
0, 0, count, count, pos2 - pos1, -1, 0)
0, 0, count, count, pos2 - pos1, 0xffffffffL, 0)
self.fp.write(endrec)
else: