Fix seekable() in BZ2File and LZMAFile to check whether the underlying file supports seek().
diff --git a/Lib/lzma.py b/Lib/lzma.py
index 780c666..3786993 100644
--- a/Lib/lzma.py
+++ b/Lib/lzma.py
@@ -165,7 +165,7 @@
def seekable(self):
"""Return whether the file supports seeking."""
- return self.readable()
+ return self.readable() and self._fp.seekable()
def readable(self):
"""Return whether the file was opened for reading."""
@@ -192,9 +192,12 @@
raise io.UnsupportedOperation("File not open for writing")
def _check_can_seek(self):
- if not self.seekable():
+ if not self.readable():
raise io.UnsupportedOperation("Seeking is only supported "
"on files open for reading")
+ if not self._fp.seekable():
+ raise io.UnsupportedOperation("The underlying file object "
+ "does not support seeking")
# Fill the readahead buffer if it is empty. Returns False on EOF.
def _fill_buffer(self):