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cvm/tools/pysfx/gzipreader.py

48 lines
1.0 KiB
Python

12 years ago
import zlib, sys
class GzipReader(object):
source = None
cobj = None
done = False
buff = ""
def __init__(self, source):
self.source = source
self.cobj = zlib.compressobj()
def read(self, size = -1):
if self.done == False:
if size < 0:
data = self.source.read()
return self.cobj.compress(data) + self.cobj.flush(zlib.Z_FINISH)
else:
# Keep reading and compressing until we have something to return.
while len(self.buff) < size:
data = self.source.read(size)
if data == "":
# Process the last data left in the compressor buffer.
self.buff += self.cobj.flush(zlib.Z_FINISH)
# Mark as done to prevent calling flush(zlib.Z_FINISH) twice.
self.done = True
return self.buff
self.buff += self.cobj.compress(data)
returndata = self.buff[:size]
self.buff = self.buff[size:]
return returndata
else:
return ""
def flush(self):
pass
def write(self, data):
pass
def close(self):
self.source.close()