Issue #9759: GzipFile now raises ValueError when an operation is attempted
after the file is closed. Patch by Jeffrey Finkelstein.
diff --git a/Lib/gzip.py b/Lib/gzip.py
index 7c3fd51..21b1404 100644
--- a/Lib/gzip.py
+++ b/Lib/gzip.py
@@ -210,6 +210,13 @@
s = repr(fileobj)
return '<gzip ' + s[1:-1] + ' ' + hex(id(self)) + '>'
+ def _check_closed(self):
+ """Raises a ValueError if the underlying file object has been closed.
+
+ """
+ if self.closed:
+ raise ValueError('I/O operation on closed file.')
+
def _init_write(self, filename):
self.name = filename
self.crc = zlib.crc32(b"") & 0xffffffff
@@ -288,6 +295,7 @@
self._add_read_data(uncompress)
def write(self,data):
+ self._check_closed()
if self.mode != WRITE:
import errno
raise IOError(errno.EBADF, "write() on read-only GzipFile object")
@@ -308,6 +316,7 @@
return len(data)
def read(self, size=-1):
+ self._check_closed()
if self.mode != READ:
import errno
raise IOError(errno.EBADF, "read() on write-only GzipFile object")
@@ -457,6 +466,7 @@
self.myfileobj = None
def flush(self,zlib_mode=zlib.Z_SYNC_FLUSH):
+ self._check_closed()
if self.mode == WRITE:
# Ensure the compressor's buffer is flushed
self.fileobj.write(self.compress.flush(zlib_mode))