diff options
Diffstat (limited to 'Lib/gzip.py')
| -rw-r--r-- | Lib/gzip.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/Lib/gzip.py b/Lib/gzip.py index 860accc64f..0bf29e86bb 100644 --- a/Lib/gzip.py +++ b/Lib/gzip.py @@ -315,7 +315,13 @@ class GzipFile: def close(self): if self.mode == WRITE: self.fileobj.write(self.compress.flush()) - write32(self.fileobj, self.crc) + # The native zlib crc is an unsigned 32-bit integer, but + # the Python wrapper implicitly casts that to a signed C + # long. So, on a 32-bit box self.crc may "look negative", + # while the same crc on a 64-bit box may "look positive". + # To avoid irksome warnings from the `struct` module, force + # it to look positive on all boxes. + write32u(self.fileobj, LOWU32(self.crc)) # self.size may exceed 2GB, or even 4GB write32u(self.fileobj, LOWU32(self.size)) self.fileobj = None |