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Fix seekable() in BZ2File and LZMAFile to check whether the underlying file supports seek().

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This commit is contained in:
Nadeem Vawda 2012-02-12 01:51:38 +02:00
parent d7e5c6ed7f
commit ae557d767f
4 changed files with 28 additions and 4 deletions
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7
Lib/lzma.py
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@ -165,7 +165,7 @@ class LZMAFile(io.BufferedIOBase):
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 @@ class LZMAFile(io.BufferedIOBase):
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):