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cvm/tools/pysfx/b64reader.py

49 lines
1.0 KiB
Python

12 years ago
import base64, sys, math
class Base64Reader(object):
def __init__(self, source):
self.source = source
self.buff = ""
self.done = False
def read(self, size = -1):
if size < 0:
return base64.b64encode(self.source.read())
else:
if self.done == False:
if len(self.buff) < size:
actual_size = int(math.ceil(size / 3) * 3)
data = self.source.read(actual_size)
if data == "":
self.done = True
return self.buff
# TODO: Investigate whether the possibility exists that we get the wrong amount
# of bytes from the source read.
self.buff += base64.b64encode(data)
if len(self.buff) > size:
returndata = self.buff[:size]
self.buff = self.buff[size:]
else:
returndata = self.buff
self.buff = ""
return returndata
else:
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()