def __init__(self, strings):
"""
Breaks meta data off of strings, checks metadata to make sure
the match, then encodes
Arguments:
strings -- List of strings
"""
symbols = [Metadata.fromstring(s) for s in strings]
if not len(symbols):
raise Exception("No symbols were provided to decode")
# Make sure we have padding and k agreement between all symbols
self.k = symbols[0][0].k
self.padding = symbols[0][0].padding
for meta, symbol in symbols:
if not (meta.k == self.k):
raise Exception("Provided symbols do not have k agreement")
if not (meta.padding == self.padding):
raise Exception("Provided symbols do not have padding agreement")
# Invoke parent's init to set up raptor coding parameters
super(StringDecoder, self).__init__(self.k)
# Actually add symbols until decoding is possible
for meta, symbol in symbols:
self.symbols.append((meta.esi, numpy.fromstring(symbol, dtype=config.dtype)))
if not self.can_decode():
raise Exception("Unable to decode with the symbols provided.")
# Calculate i symbols
self.calculate_i_symbols()
def test_bad_padding(self):
"""
Simulates bad metadata value for padding on one symbol
"""
size = 80
padding = 10
symbols = self.get_random_symbols(size, padding)
meta, symbol = Metadata.fromstring(symbols[0])
meta.padding = padding + 1
symbols[0] = "%s%s" % (str(meta), symbol)
with self.assertRaises(Exception):
coder = StringDecoder(symbols)
def __init__(self, strings):
"""
Breaks meta data off of strings, checks metadata to make sure
the match, then encodes
Arguments:
strings -- List of strings
"""
symbols = [Metadata.fromstring(s) for s in strings]
if not len(symbols):
raise Exception("No symbols were provided to decode")
# Make sure we have padding and k agreement between all symbols
self.k = symbols[0][0].k
self.padding = symbols[0][0].padding
for meta, symbol in symbols:
if not (meta.k == self.k):
raise Exception("Provided symbols do not have k agreement")
if not (meta.padding == self.padding):
raise Exception("Provided symbols do not "
"have padding agreement")
# Invoke parent's init to set up raptor coding parameters
super(StringDecoder, self).__init__(self.k)
# Actually add symbols until decoding is possible
for meta, symbol in symbols:
self.symbols.append((meta.esi,
numpy.fromstring(symbol,
dtype=config.dtype)))
if not self.can_decode():
raise Exception("Unable to decode with the symbols provided.")
# Calculate i symbols
self.calculate_i_symbols()
