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"""Python implementation of Z85 85-bit encoding
Z85 encoding is a plaintext encoding for a bytestring interpreted as 32bit integers.
Since the chunks are 32bit, a bytestring must be a multiple of 4 bytes.
See ZMQ RFC 32 for details.
"""
# Copyright (C) PyZMQ Developers
# Distributed under the terms of the Modified BSD License.
import struct
# Z85CHARS is the base 85 symbol table
Z85CHARS = b"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.-:+=^!/*?&<>()[]{}@%$#"
# Z85MAP maps integers in [0,84] to the appropriate character in Z85CHARS
Z85MAP = {c: idx for idx, c in enumerate(Z85CHARS)}
_85s = [85**i for i in range(5)][::-1]
def encode(rawbytes):
"""encode raw bytes into Z85"""
# Accepts only byte arrays bounded to 4 bytes
if len(rawbytes) % 4:
raise ValueError("length must be multiple of 4, not %i" % len(rawbytes))
nvalues = len(rawbytes) / 4
values = struct.unpack('>%dI' % nvalues, rawbytes)
encoded = []
for v in values:
for offset in _85s:
encoded.append(Z85CHARS[(v // offset) % 85])
return bytes(encoded)
def decode(z85bytes):
"""decode Z85 bytes to raw bytes, accepts ASCII string"""
if isinstance(z85bytes, str):
try:
z85bytes = z85bytes.encode('ascii')
except UnicodeEncodeError:
raise ValueError('string argument should contain only ASCII characters')
if len(z85bytes) % 5:
raise ValueError("Z85 length must be multiple of 5, not %i" % len(z85bytes))
nvalues = len(z85bytes) / 5
values = []
for i in range(0, len(z85bytes), 5):
value = 0
for j, offset in enumerate(_85s):
value += Z85MAP[z85bytes[i + j]] * offset
values.append(value)
return struct.pack('>%dI' % nvalues, *values)