From c40b5b97fdac5099f670589b42c9038d7b23f2e5 Mon Sep 17 00:00:00 2001 From: Matan Perelman Date: Sun, 25 Feb 2024 19:17:54 +0200 Subject: bpo-31116: Add Z85 variant to base64 (GH-30598) Z85 specification: https://rfc.zeromq.org/spec/32/ --- Doc/library/base64.rst | 18 +++++ Doc/whatsnew/3.13.rst | 8 ++ Lib/base64.py | 29 +++++++- Lib/test/test_base64.py | 87 +++++++++++++++++++++- .../2022-01-14-10-50-17.bpo-31116.0bduV9.rst | 1 + 5 files changed, 141 insertions(+), 2 deletions(-) create mode 100644 Misc/NEWS.d/next/Library/2022-01-14-10-50-17.bpo-31116.0bduV9.rst diff --git a/Doc/library/base64.rst b/Doc/library/base64.rst index d5b6af8..e596893 100644 --- a/Doc/library/base64.rst +++ b/Doc/library/base64.rst @@ -244,6 +244,24 @@ The modern interface provides: .. versionadded:: 3.4 +.. function:: z85encode(s) + + Encode the :term:`bytes-like object` *s* using Z85 (as used in ZeroMQ) + and return the encoded :class:`bytes`. See `Z85 specification + `_ for more information. + + .. versionadded:: 3.13 + + +.. function:: z85decode(s) + + Decode the Z85-encoded :term:`bytes-like object` or ASCII string *s* and + return the decoded :class:`bytes`. See `Z85 specification + `_ for more information. + + .. versionadded:: 3.13 + + The legacy interface: .. function:: decode(input, output) diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst index 4082358..a393a1d 100644 --- a/Doc/whatsnew/3.13.rst +++ b/Doc/whatsnew/3.13.rst @@ -224,6 +224,14 @@ asyncio the buffer size. (Contributed by Jamie Phan in :gh:`115199`.) +base64 +--- + +* Add :func:`base64.z85encode` and :func:`base64.z85decode` functions which allow encoding + and decoding z85 data. + See `Z85 specification `_ for more information. + (Contributed by Matan Perelman in :gh:`75299`.) + copy ---- diff --git a/Lib/base64.py b/Lib/base64.py index e3e983b..25164d1 100755 --- a/Lib/base64.py +++ b/Lib/base64.py @@ -18,7 +18,7 @@ __all__ = [ 'b64encode', 'b64decode', 'b32encode', 'b32decode', 'b32hexencode', 'b32hexdecode', 'b16encode', 'b16decode', # Base85 and Ascii85 encodings - 'b85encode', 'b85decode', 'a85encode', 'a85decode', + 'b85encode', 'b85decode', 'a85encode', 'a85decode', 'z85encode', 'z85decode', # Standard Base64 encoding 'standard_b64encode', 'standard_b64decode', # Some common Base64 alternatives. As referenced by RFC 3458, see thread @@ -497,6 +497,33 @@ def b85decode(b): result = result[:-padding] return result +_z85alphabet = (b'0123456789abcdefghijklmnopqrstuvwxyz' + b'ABCDEFGHIJKLMNOPQRSTUVWXYZ.-:+=^!/*?&<>()[]{}@%$#') +# Translating b85 valid but z85 invalid chars to b'\x00' is required +# to prevent them from being decoded as b85 valid chars. +_z85_b85_decode_diff = b';_`|~' +_z85_decode_translation = bytes.maketrans( + _z85alphabet + _z85_b85_decode_diff, + _b85alphabet + b'\x00' * len(_z85_b85_decode_diff) +) +_z85_encode_translation = bytes.maketrans(_b85alphabet, _z85alphabet) + +def z85encode(s): + """Encode bytes-like object b in z85 format and return a bytes object.""" + return b85encode(s).translate(_z85_encode_translation) + +def z85decode(s): + """Decode the z85-encoded bytes-like object or ASCII string b + + The result is returned as a bytes object. + """ + s = _bytes_from_decode_data(s) + s = s.translate(_z85_decode_translation) + try: + return b85decode(s) + except ValueError as e: + raise ValueError(e.args[0].replace('base85', 'z85')) from None + # Legacy interface. This code could be cleaned up since I don't believe # binascii has any line length limitations. It just doesn't seem worth it # though. The files should be opened in binary mode. diff --git a/Lib/test/test_base64.py b/Lib/test/test_base64.py index f6171d3..409c8c1 100644 --- a/Lib/test/test_base64.py +++ b/Lib/test/test_base64.py @@ -545,6 +545,40 @@ class BaseXYTestCase(unittest.TestCase): self.check_other_types(base64.b85encode, b"www.python.org", b'cXxL#aCvlSZ*DGca%T') + def test_z85encode(self): + eq = self.assertEqual + + tests = { + b'': b'', + b'www.python.org': b'CxXl-AcVLsz/dgCA+t', + bytes(range(255)): b"""009c61o!#m2NH?C3>iWS5d]J*6CRx17-skh9337x""" + b"""ar.{NbQB=+c[cR@eg&FcfFLssg=mfIi5%2YjuU>)kTv.7l}6Nnnj=AD""" + b"""oIFnTp/ga?r8($2sxO*itWpVyu$0IOwmYv=xLzi%y&a6dAb/]tBAI+J""" + b"""CZjQZE0{D[FpSr8GOteoH(41EJe-&}x#)cTlf[Bu8v].4}L}1:^-""" + b"""@qDP""", + b"""abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ""" + b"""0123456789!@#0^&*();:<>,. []{}""": + b"""vpA.SwObN*x>?B1zeKohADlbxB-}$ND3R+ylQTvjm[uizoh55PpF:[^""" + b"""q=D:$s6eQefFLssg=mfIi5@cEbqrBJdKV-ciY]OSe*aw7DWL""", + b'no padding..': b'zF{UpvpS[.zF7NO', + b'zero compression\x00\x00\x00\x00': b'Ds.bnay/tbAb]JhB7]Mg00000', + b'zero compression\x00\x00\x00': b'Ds.bnay/tbAb]JhB7]Mg0000', + b"""Boundary:\x00\x00\x00\x00""": b"""lt}0:wmoI7iSGcW00""", + b'Space compr: ': b'q/DePwGUG3ze:IRarR^H', + b'\xff': b'@@', + b'\xff'*2: b'%nJ', + b'\xff'*3: b'%nS9', + b'\xff'*4: b'%nSc0', + } + + for data, res in tests.items(): + eq(base64.z85encode(data), res) + + self.check_other_types(base64.z85encode, b"www.python.org", + b'CxXl-AcVLsz/dgCA+t') + def test_a85decode(self): eq = self.assertEqual @@ -626,6 +660,41 @@ class BaseXYTestCase(unittest.TestCase): self.check_other_types(base64.b85decode, b'cXxL#aCvlSZ*DGca%T', b"www.python.org") + def test_z85decode(self): + eq = self.assertEqual + + tests = { + b'': b'', + b'CxXl-AcVLsz/dgCA+t': b'www.python.org', + b"""009c61o!#m2NH?C3>iWS5d]J*6CRx17-skh9337x""" + b"""ar.{NbQB=+c[cR@eg&FcfFLssg=mfIi5%2YjuU>)kTv.7l}6Nnnj=AD""" + b"""oIFnTp/ga?r8($2sxO*itWpVyu$0IOwmYv=xLzi%y&a6dAb/]tBAI+J""" + b"""CZjQZE0{D[FpSr8GOteoH(41EJe-&}x#)cTlf[Bu8v].4}L}1:^-""" + b"""@qDP""": bytes(range(255)), + b"""vpA.SwObN*x>?B1zeKohADlbxB-}$ND3R+ylQTvjm[uizoh55PpF:[^""" + b"""q=D:$s6eQefFLssg=mfIi5@cEbqrBJdKV-ciY]OSe*aw7DWL""": + b"""abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ""" + b"""0123456789!@#0^&*();:<>,. []{}""", + b'zF{UpvpS[.zF7NO': b'no padding..', + b'Ds.bnay/tbAb]JhB7]Mg00000': b'zero compression\x00\x00\x00\x00', + b'Ds.bnay/tbAb]JhB7]Mg0000': b'zero compression\x00\x00\x00', + b"""lt}0:wmoI7iSGcW00""": b"""Boundary:\x00\x00\x00\x00""", + b'q/DePwGUG3ze:IRarR^H': b'Space compr: ', + b'@@': b'\xff', + b'%nJ': b'\xff'*2, + b'%nS9': b'\xff'*3, + b'%nSc0': b'\xff'*4, + } + + for data, res in tests.items(): + eq(base64.z85decode(data), res) + eq(base64.z85decode(data.decode("ascii")), res) + + self.check_other_types(base64.z85decode, b'CxXl-AcVLsz/dgCA+t', + b'www.python.org') + def test_a85_padding(self): eq = self.assertEqual @@ -707,6 +776,21 @@ class BaseXYTestCase(unittest.TestCase): self.assertRaises(ValueError, base64.b85decode, b'|NsC') self.assertRaises(ValueError, base64.b85decode, b'|NsC1') + def test_z85decode_errors(self): + illegal = list(range(33)) + \ + list(b'"\',;_`|\\~') + \ + list(range(128, 256)) + for c in illegal: + with self.assertRaises(ValueError, msg=bytes([c])): + base64.z85decode(b'0000' + bytes([c])) + + # b'\xff\xff\xff\xff' encodes to b'%nSc0', the following will overflow: + self.assertRaises(ValueError, base64.z85decode, b'%') + self.assertRaises(ValueError, base64.z85decode, b'%n') + self.assertRaises(ValueError, base64.z85decode, b'%nS') + self.assertRaises(ValueError, base64.z85decode, b'%nSc') + self.assertRaises(ValueError, base64.z85decode, b'%nSc1') + def test_decode_nonascii_str(self): decode_funcs = (base64.b64decode, base64.standard_b64decode, @@ -714,7 +798,8 @@ class BaseXYTestCase(unittest.TestCase): base64.b32decode, base64.b16decode, base64.b85decode, - base64.a85decode) + base64.a85decode, + base64.z85decode) for f in decode_funcs: self.assertRaises(ValueError, f, 'with non-ascii \xcb') diff --git a/Misc/NEWS.d/next/Library/2022-01-14-10-50-17.bpo-31116.0bduV9.rst b/Misc/NEWS.d/next/Library/2022-01-14-10-50-17.bpo-31116.0bduV9.rst new file mode 100644 index 0000000..d77a96b --- /dev/null +++ b/Misc/NEWS.d/next/Library/2022-01-14-10-50-17.bpo-31116.0bduV9.rst @@ -0,0 +1 @@ +Add Z85 encoding to ``base64``. -- cgit v0.12 Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.
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