def _parseHeaders(self, data):
"Given a control frame data block, return a list of (name, value) tuples."
# TODO: separate null-delimited into separate instances
data = decompress(data, dictionary=dictionary) # FIXME: catch errors
cursor = 2
(num_hdrs,) = struct.unpack("!h", data[:cursor]) # FIXME: catch errors
hdrs = []
while cursor < len(data):
try:
(name_len,) = struct.unpack("!h", data[cursor:cursor+2]) # FIXME: catch errors
cursor += 2
name = data[cursor:cursor+name_len] # FIXME: catch errors
cursor += name_len
except IndexError:
raise
except struct.error:
raise
try:
(val_len,) = struct.unpack("!h", data[cursor:cursor+2]) # FIXME: catch errors
cursor += 2
value = data[cursor:cursor+val_len] # FIXME: catch errors
cursor += val_len
except IndexError:
raise
except struct.error:
print len(data), cursor, data # FIXME
raise
self.addRawHeader(name, value)
def _parse_header_chunk(self, compressed_data, version):
#chunk = self.inflater.decompress(compressed_data)
chunk = decompress(compressed_data, dictionary=HEADER_ZLIB_DICT_2)
#print 'decompressed_headers', repr(chunk)
length_size = 2 if version == 2 else 4
length_fmt = '>H' if length_size == 2 else '>L'
headers = {}
#first two bytes: number of pairs
#num_values = int.from_bytes(chunk[0:length_size], 'big')
num_values = struct.unpack(length_fmt, chunk[0:length_size])[0]
#after that...
cursor = length_size
for _ in range(num_values):
#two/four bytes: length of name
#name_length = int.from_bytes(chunk[cursor:cursor+length_size], 'big')
name_length = struct.unpack(length_fmt, chunk[cursor:cursor+length_size])[0]
cursor += length_size
#next name_length bytes: name
name = chunk[cursor:cursor+name_length].decode('UTF-8')
cursor += name_length
#two/four bytes: length of value
#value_length = int.from_bytes(chunk[cursor:cursor+length_size], 'big')
value_length = struct.unpack(length_fmt, chunk[cursor:cursor+length_size])[0]
cursor += length_size
#next value_length bytes: value
value = chunk[cursor:cursor+value_length].decode('UTF-8')
cursor += value_length
if name_length == 0 or value_length == 0:
raise SpdyProtocolError("zero-length name or value in n/v block")
if name in headers:
raise SpdyProtocolError("duplicate name in n/v block")
headers[name] = value
return headers
