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PyQIODevice: Check if device is readable/writable.

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This commit is contained in:
Florian Bruhin 2015-05-25 20:52:51 +02:00
parent 35f0b26f4a
commit b2d763f993
1 changed files with 12 additions and 0 deletions
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12
qutebrowser/utils/qtutils.py
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@ -244,6 +244,16 @@ class PyQIODevice(io.BufferedIOBase):
if not self.seekable(): if not self.seekable():
raise OSError("Random access not allowed!") raise OSError("Random access not allowed!")
def _check_readable(self):
"""Check if the device is readable, raise OSError if not."""
if not self._dev.isReadable():
raise OSError("Trying to read unreadable file!")
def _check_writable(self):
"""Check if the device is writable, raise OSError if not."""
if not self.writable():
raise OSError("Trying to write to unwritable file!")
def fileno(self): def fileno(self):
raise io.UnsupportedOperation raise io.UnsupportedOperation
@ -285,6 +295,7 @@ class PyQIODevice(io.BufferedIOBase):
def readline(self, size=-1): def readline(self, size=-1):
self._check_open() self._check_open()
self._check_readable()
if size == -1: if size == -1:
size = 0 size = 0
return self._dev.readLine(size) return self._dev.readLine(size)
@ -302,6 +313,7 @@ class PyQIODevice(io.BufferedIOBase):
def write(self, b): def write(self, b):
self._check_open() self._check_open()
self._check_writable()
num = self._dev.write(b) num = self._dev.write(b)
if num == -1 or num < len(b): if num == -1 or num < len(b):
raise OSError(self._dev.errorString()) raise OSError(self._dev.errorString())