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Close #10142: Support for SEEK_HOLE/SEEK_DATA

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This commit is contained in:
Jesus Cea 2012-04-26 16:39:35 +02:00
parent 790a9b4c19
commit 2b47f0a23f
8 changed files with 60 additions and 12 deletions
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12
Lib/_pyio.py
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@ -306,6 +306,7 @@ class IOBase(metaclass=abc.ABCMeta):
* 0 -- start of stream (the default); offset should be zero or positive
* 1 -- current stream position; offset may be negative
* 2 -- end of stream; offset is usually negative
Some operating systems / file systems could provide additional values.
Return an int indicating the new absolute position.
"""
@ -866,7 +867,7 @@ class BytesIO(BufferedIOBase):
elif whence == 2:
self._pos = max(0, len(self._buffer) + pos)
else:
raise ValueError("invalid whence value")
raise ValueError("unsupported whence value")
return self._pos
def tell(self):
@ -1041,8 +1042,6 @@ class BufferedReader(_BufferedIOMixin):
return _BufferedIOMixin.tell(self) - len(self._read_buf) + self._read_pos
def seek(self, pos, whence=0):
if not (0 <= whence <= 2):
raise ValueError("invalid whence value")
with self._read_lock:
if whence == 1:
pos -= len(self._read_buf) - self._read_pos
@ -1138,8 +1137,6 @@ class BufferedWriter(_BufferedIOMixin):
return _BufferedIOMixin.tell(self) + len(self._write_buf)
def seek(self, pos, whence=0):
if not (0 <= whence <= 2):
raise ValueError("invalid whence")
with self._write_lock:
self._flush_unlocked()
return _BufferedIOMixin.seek(self, pos, whence)
@ -1235,8 +1232,6 @@ class BufferedRandom(BufferedWriter, BufferedReader):
BufferedWriter.__init__(self, raw, buffer_size, max_buffer_size)
def seek(self, pos, whence=0):
if not (0 <= whence <= 2):
raise ValueError("invalid whence")
self.flush()
if self._read_buf:
# Undo read ahead.
@ -1852,8 +1847,7 @@ class TextIOWrapper(TextIOBase):
self._decoder.reset()
return position
if whence != 0:
raise ValueError("invalid whence (%r, should be 0, 1 or 2)" %
(whence,))
raise ValueError("unsupported whence (%r)" % (whence,))
if cookie < 0:
raise ValueError("negative seek position %r" % (cookie,))
self.flush()