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import abc
import struct
import codecs
import binascii
class Atomic(object):
"""ABC for objects that can be RLP encoded as is."""
__metaclass__ = abc.ABCMeta
Atomic.register(str)
Atomic.register(bytearray)
Atomic.register(unicode)
bytes_to_str = str
ascii_chr = chr
def str_to_bytes(value):
if isinstance(value, (bytes, bytearray)):
return bytes(value)
elif isinstance(value, unicode):
return codecs.encode(value, 'utf8')
else:
raise TypeError("Value must be text, bytes, or bytearray")
def _old_int_to_big_endian(value):
cs = []
while value > 0:
cs.append(chr(value % 256))
value /= 256
s = ''.join(reversed(cs))
return s
def packl(lnum):
if lnum == 0:
return b'\0'
s = hex(lnum)[2:]
s = s.rstrip('L')
if len(s) & 1:
s = '0' + s
s = binascii.unhexlify(s)
return s
int_to_big_endian = packl
def big_endian_to_int(value):
if len(value) == 1:
return ord(value)
elif len(value) <= 8:
return struct.unpack('>Q', value.rjust(8, '\x00'))[0]
else:
return int(encode_hex(value), 16)
def is_integer(value):
return isinstance(value, (int, long))
def decode_hex(s):
if isinstance(s, bytearray):
s = str(s)
if not isinstance(s, (str, unicode)):
raise TypeError('Value must be an instance of str or unicode')
return s.decode('hex')
def encode_hex(s):
if isinstance(s, bytearray):
s = str(s)
if not isinstance(s, (str, unicode)):
raise TypeError('Value must be an instance of str or unicode')
return s.encode('hex')
def safe_ord(s):
if isinstance(s, int):
return s
return ord(s)
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