Revision 41ddb860 pithos/lib/hashfiler/context_file.py

b/pithos/lib/hashfiler/context_file.py
1
# Copyright 2011 GRNET S.A. All rights reserved.
2
# 
3
# Redistribution and use in source and binary forms, with or
4
# without modification, are permitted provided that the following
5
# conditions are met:
6
# 
7
#   1. Redistributions of source code must retain the above
8
#      copyright notice, this list of conditions and the following
9
#      disclaimer.
10
# 
11
#   2. Redistributions in binary form must reproduce the above
12
#      copyright notice, this list of conditions and the following
13
#      disclaimer in the documentation and/or other materials
14
#      provided with the distribution.
15
# 
16
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
17
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
20
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
23
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
24
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
26
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27
# POSSIBILITY OF SUCH DAMAGE.
28
# 
29
# The views and conclusions contained in the software and
30
# documentation are those of the authors and should not be
31
# interpreted as representing official policies, either expressed
32
# or implied, of GRNET S.A.
33

  
1 34
from os import SEEK_CUR, SEEK_SET, fsync
2 35
from errno import ENOENT
3 36

  
37

  
4 38
_zeros = ''
5 39

  
40

  
6 41
def zeros(nr):
7 42
    global _zeros
8 43
    size = len(_zeros)
......
17 52
        _zeros = _zeros[:nr]
18 53
        return _zeros
19 54

  
55

  
20 56
def file_sync_write_chunks(openfile, chunksize, offset, chunks, size=None):
21 57
    """Write given chunks to the given buffered file object.
22 58
       Writes never span across chunk boundaries.

Also available in: Unified diff