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Diffstat (limited to 'external_libs/python/zmq/utils/z85.py')
-rw-r--r-- | external_libs/python/zmq/utils/z85.py | 56 |
1 files changed, 0 insertions, 56 deletions
diff --git a/external_libs/python/zmq/utils/z85.py b/external_libs/python/zmq/utils/z85.py deleted file mode 100644 index 1bb1784e..00000000 --- a/external_libs/python/zmq/utils/z85.py +++ /dev/null @@ -1,56 +0,0 @@ -"""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 sys -import struct - -PY3 = sys.version_info[0] >= 3 -# Z85CHARS is the base 85 symbol table -Z85CHARS = b"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.-:+=^!/*?&<>()[]{}@%$#" -# Z85MAP maps integers in [0,84] to the appropriate character in Z85CHARS -Z85MAP = dict([(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]) - - # In Python 3, encoded is a list of integers (obviously?!) - if PY3: - return bytes(encoded) - else: - return b''.join(encoded) - -def decode(z85bytes): - """decode Z85 bytes to raw bytes""" - 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) |