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#! python
#
# This is a codec to create and decode hexdumps with spaces between characters. used by miniterm.
#
# This file is part of pySerial. https://github.com/pyserial/pyserial
# (C) 2011 Chris Liechti <cliechti@gmx.net>
#
# SPDX-License-Identifier: BSD-3-Clause
"""\
Python 'hex' Codec - 2-digit hex with spaces content transfer encoding.
"""
import codecs
import serial
HEXDIGITS = '0123456789ABCDEF'
### Codec APIs
def hex_encode(input, errors='strict'):
return (serial.to_bytes([int(h, 16) for h in input.split()]), len(input))
def hex_decode(input, errors='strict'):
return (''.join('{:02X} '.format(b) for b in input), len(input))
class Codec(codecs.Codec):
def encode(self, input, errors='strict'):
return serial.to_bytes([int(h, 16) for h in input.split()])
def decode(self, input, errors='strict'):
return ''.join('{:02X} '.format(b) for b in input)
class IncrementalEncoder(codecs.IncrementalEncoder):
def __init__(self, errors='strict'):
self.errors = errors
self.state = 0
def reset(self):
self.state = 0
def getstate(self):
return self.state
def setstate(self, state):
self.state = state
def encode(self, input, final=False):
state = self.state
encoded = []
for c in input.upper():
if c in HEXDIGITS:
z = HEXDIGITS.index(c)
if state:
encoded.append(z + (state & 0xf0))
state = 0
else:
state = 0x100 + (z << 4)
elif c == ' ': # allow spaces to separate values
if state and self.errors == 'strict':
raise UnicodeError('odd number of hex digits')
state = 0
else:
if self.errors == 'strict':
raise UnicodeError('non-hex digit found: %r' % c)
self.state = state
return serial.to_bytes(encoded)
class IncrementalDecoder(codecs.IncrementalDecoder):
def decode(self, input, final=False):
return ''.join('{:02X} '.format(b) for b in input)
class StreamWriter(Codec, codecs.StreamWriter):
pass
class StreamReader(Codec, codecs.StreamReader):
pass
### encodings module API
def getregentry():
return codecs.CodecInfo(
name='hexlify',
encode=hex_encode,
decode=hex_decode,
incrementalencoder=IncrementalEncoder,
incrementaldecoder=IncrementalDecoder,
streamwriter=StreamWriter,
streamreader=StreamReader,
_is_text_encoding=True,
)
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