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import gzip
import StringIO
IDENTITY = 0
GZIP = 1
all = [IDENTITY, GZIP]
class UnknownEncodingError(Exception):
"""Exception which is raised when an unknown encoding has been requested"""
pass
def get(encoding):
if encoding in all:
return encoding
elif encoding.lower() == 'identity':
return IDENTITY
elif encoding.lower() == 'gzip':
return GZIP
else:
raise UnknownEncodingError
def str(encoding):
encoding = get(encoding)
if encoding == IDENTITY:
return 'identity'
elif encoding == GZIP:
return 'gzip'
else:
raise UnknownEncodingError
def encode(encoding, data):
encoding = get(encoding)
if encoding == IDENTITY:
return data
elif encoding == GZIP:
zbuf = StringIO.StringIO()
zfile = gzip.GzipFile(None, 'wb', 9, zbuf)
zfile.write(data)
zfile.close()
return zbuf.getvalue()
else:
raise UnknownEncodingError
def decode(encoding, data):
encoding = get(encoding)
if encoding == IDENTITY:
return data
elif encoding == GZIP:
zbuf = StringIO.StringIO(data)
zfile = gzip.GzipFile(None, 'r', 9, zbuf)
data = zfile.read()
zfile.close()
return data
else:
raise UnknownEncodingError
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