2 # the decoder works off a reader
3 # the encoder returns bytearray
7 return bytearray(h.decode('hex'))
11 if type(b) in (str, unicode):
12 return "".join([hex(ord(c))[2:].zfill(2) for c in b])
14 return bytes2hex(b.decode())
17 # expects uvarint64 (no crazy big nums!)
21 for j in xrange(1, 8):
29 def encode_big_endian(i, size):
32 return encode_big_endian(i / 256, size - 1) + bytearray([i % 256])
35 def decode_big_endian(reader, size):
38 firstByte = reader.read(1)[0]
39 return firstByte * (256 ** (size - 1)) + decode_big_endian(reader, size - 1)
41 # ints are max 16 bytes long
49 size = uvarint_size(i)
52 big_end = encode_big_endian(i, size)
55 return bytearray([size]) + big_end
57 # returns the int and whats left of the byte array
60 def decode_varint(reader):
61 size = reader.read(1)[0]
65 negate = True if size > int(0xF0) else False
68 i = decode_big_endian(reader, size)
75 size = encode_varint(len(s))
76 return size + bytearray(s)
79 def decode_string(reader):
80 length = decode_varint(reader)
81 return str(reader.read(length))
86 map(b.extend, map(encode, s))
87 return encode_varint(len(s)) + b
93 if isinstance(s, int):
94 return encode_varint(s)
95 elif isinstance(s, str):
96 return encode_string(s)
97 elif isinstance(s, list):
100 print "UNSUPPORTED TYPE!", type(s), s
103 if __name__ == '__main__':
104 ns = [100, 100, 1000, 256]
106 bs = map(encode_big_endian, ns, ss)
107 ds = map(decode_big_endian, bs, ss)
109 print [i[0] for i in ds]
111 ss = ["abc", "hi there jim", "ok now what"]
112 e = map(encode_string, ss)
113 d = map(decode_string, e)
115 print [i[0] for i in d]