def _stringToBuffer(datastring):
"""_stringToBuffer(datastring) allocates a buffer, copies datastring into
it, and returns the buffer.
"""
abuff = memory.new_memory(len(datastring))
memory.writeable_buffer(abuff)[:] = datastring
return abuff
def _stringToBuffer(datastring):
"""_stringToBuffer(datastring) allocates a buffer, copies datastring into
it, and returns the buffer.
"""
abuff = memory.new_memory(len(datastring))
memory.writeable_buffer(abuff)[:] = datastring
return abuff
def _buffer(self, begin=0, end=None):
"""_buffer(self) returns a buffer object for Memmap 'self'.
"""
if self._mmap is None:
raise RuntimeError("Memmap no longer valid. (closed?)")
if end is None:
end = len(self)
if self._readonly:
return buffer(self._mmap, begin, end - begin)
else:
return memory.writeable_buffer(self._mmap, begin, end - begin)
def _buffer(self, begin=0, end=None):
"""_buffer(self) returns a buffer object for Memmap 'self'.
"""
if self._mmap is None:
raise RuntimeError("Memmap no longer valid. (closed?)")
if end is None:
end = len(self)
if self._readonly:
return buffer(self._mmap, begin, end-begin)
else:
return memory.writeable_buffer(self._mmap, begin, end-begin)
def _setitem(self, offset, value):
"""_setitem(self, offset) sets 'offset' to result of "padding" 'value'.
_setitem silently truncates inputs which are too long.
>>> s=array([""])
>>> s[0] = "this"
>>> s
CharArray([''])
>>> s=array(["this","that"])
>>> s[0] = "othe"
>>> s
CharArray(['othe', 'that'])
>>> s[1] = "v"
>>> s
CharArray(['othe', 'v'])
>>> s = array("")
>>> s[0] = "this"
>>> s
CharArray([''])
"""
bo = offset
where = memory.writeable_buffer(self._data)
where[bo : bo + self._itemsize] = self.pad(value)[0 : self._itemsize]
def _setitem(self, offset, value):
"""_setitem(self, offset) sets 'offset' to result of "padding" 'value'.
_setitem silently truncates inputs which are too long.
>>> s=array([""])
>>> s[0] = "this"
>>> s
CharArray([''])
>>> s=array(["this","that"])
>>> s[0] = "othe"
>>> s
CharArray(['othe', 'that'])
>>> s[1] = "v"
>>> s
CharArray(['othe', 'v'])
>>> s = array("")
>>> s[0] = "this"
>>> s
CharArray([''])
"""
bo = offset
where = memory.writeable_buffer(self._data)
where[bo:bo + self._itemsize] = self.pad(value)[0:self._itemsize]
def insert(self, offset, size=None, buffer=None):
"""
insert(self, offset, size) inserts a new slice of 'size'
bytes, possibly between two adjacent slices, at byte 'offset'.
It is not legal to insert into the middle of another slice, but
pretty much everything else is legal. The resulting
MemmapSlice is returned.
>>> m = open("memmap.tst",mode="w+",len=100)
>>> n = m[0:50]
>>> p = m[50:100]
>>> q=m.insert(0, 200)
>>> r=m.insert(50, 100)
>>> s=m.insert(100, 300)
>>> t=m.insert(45, 100)
Traceback (most recent call last):
...
IndexError: Slice overlaps prior slice of same file.
>>> m.flush()
>>> len(m)
700
>>> m.close()
"""
self._chkIndex(offset, isSlice=1)
self._chkOverlaps(offset, offset)
if buffer is None:
mem = memory.new_memory(size)
mem = memory.writeable_buffer(mem)
elif size is None or len(buffer) == size:
mem = buffer
size = len(buffer)
else:
raise ValueError("buffer and size don't match.")
obj = MemmapSlice(mem, dirty=1)
self._slices.append((offset, offset, obj))
return obj
def insert(self, offset, size=None, buffer=None):
"""
insert(self, offset, size) inserts a new slice of 'size'
bytes, possibly between two adjacent slices, at byte 'offset'.
It is not legal to insert into the middle of another slice, but
pretty much everything else is legal. The resulting
MemmapSlice is returned.
>>> m = open("memmap.tst",mode="w+",len=100)
>>> n = m[0:50]
>>> p = m[50:100]
>>> q=m.insert(0, 200)
>>> r=m.insert(50, 100)
>>> s=m.insert(100, 300)
>>> t=m.insert(45, 100)
Traceback (most recent call last):
...
IndexError: Slice overlaps prior slice of same file.
>>> m.flush()
>>> len(m)
700
>>> m.close()
"""
self._chkIndex(offset, isSlice=1)
self._chkOverlaps(offset, offset)
if buffer is None:
mem = memory.new_memory(size)
mem = memory.writeable_buffer(mem)
elif size is None or len(buffer) == size:
mem = buffer
size = len(buffer)
else:
raise ValueError("buffer and size don't match.")
obj = MemmapSlice(mem, dirty=1)
self._slices.append((offset, offset, obj))
return obj
