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王立帮
256
boards/default/micropython_k210_mixgoai/build/lib/base64.py
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256
boards/default/micropython_k210_mixgoai/build/lib/base64.py
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import re
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import struct
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import binascii
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__all__ = [
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'encode', 'decode', 'encodebytes', 'decodebytes',
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'b64encode', 'b64decode', 'b32encode', 'b32decode',
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'b16encode', 'b16decode',
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'standard_b64encode', 'standard_b64decode',
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'urlsafe_b64encode', 'urlsafe_b64decode',
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]
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bytes_types = (bytes, bytearray)
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def _bytes_from_decode_data(s):
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if isinstance(s, str):
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try:
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return s.encode('ascii')
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except:
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raise ValueError('string argument should contain only ASCII characters')
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elif isinstance(s, bytes_types):
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return s
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else:
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raise TypeError("argument should be bytes or ASCII string, not %s" % s.__class__.__name__)
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def b64encode(s, altchars=None):
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if not isinstance(s, bytes_types):
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raise TypeError("expected bytes, not %s" % s.__class__.__name__)
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encoded = binascii.b2a_base64(s)[:-1]
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if altchars is not None:
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if not isinstance(altchars, bytes_types):
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raise TypeError("expected bytes, not %s"
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% altchars.__class__.__name__)
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assert len(altchars) == 2, repr(altchars)
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return encoded.translate(bytes.maketrans(b'+/', altchars))
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return encoded
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def b64decode(s, altchars=None, validate=False):
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s = _bytes_from_decode_data(s)
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if altchars is not None:
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altchars = _bytes_from_decode_data(altchars)
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assert len(altchars) == 2, repr(altchars)
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s = s.translate(bytes.maketrans(altchars, b'+/'))
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if validate and not re.match(b'^[A-Za-z0-9+/]*={0,2}$', s):
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raise binascii.Error('Non-base64 digit found')
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return binascii.a2b_base64(s)
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def standard_b64encode(s):
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return b64encode(s)
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def standard_b64decode(s):
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return b64decode(s)
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def urlsafe_b64encode(s):
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raise NotImplementedError()
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def urlsafe_b64decode(s):
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raise NotImplementedError()
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_b32alphabet = {
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0: b'A', 9: b'J', 18: b'S', 27: b'3',
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1: b'B', 10: b'K', 19: b'T', 28: b'4',
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2: b'C', 11: b'L', 20: b'U', 29: b'5',
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3: b'D', 12: b'M', 21: b'V', 30: b'6',
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4: b'E', 13: b'N', 22: b'W', 31: b'7',
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5: b'F', 14: b'O', 23: b'X',
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6: b'G', 15: b'P', 24: b'Y',
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7: b'H', 16: b'Q', 25: b'Z',
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8: b'I', 17: b'R', 26: b'2',
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}
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_b32tab = [v[0] for k, v in sorted(_b32alphabet.items())]
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_b32rev = dict([(v[0], k) for k, v in _b32alphabet.items()])
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def b32encode(s):
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if not isinstance(s, bytes_types):
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raise TypeError("expected bytes, not %s" % s.__class__.__name__)
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quanta, leftover = divmod(len(s), 5)
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if leftover:
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s = s + bytes(5 - leftover) # Don't use += !
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quanta += 1
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encoded = bytearray()
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for i in range(quanta):
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c1, c2, c3 = struct.unpack('!HHB', s[i*5:(i+1)*5])
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c2 += (c1 & 1) << 16
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c3 += (c2 & 3) << 8
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encoded += bytes([_b32tab[c1 >> 11],
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_b32tab[(c1 >> 6) & 0x1f],
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_b32tab[(c1 >> 1) & 0x1f],
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_b32tab[c2 >> 12],
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_b32tab[(c2 >> 7) & 0x1f],
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_b32tab[(c2 >> 2) & 0x1f],
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_b32tab[c3 >> 5],
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_b32tab[c3 & 0x1f],
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])
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if leftover == 1:
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encoded = encoded[:-6] + b'======'
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elif leftover == 2:
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encoded = encoded[:-4] + b'===='
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elif leftover == 3:
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encoded = encoded[:-3] + b'==='
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elif leftover == 4:
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encoded = encoded[:-1] + b'='
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return bytes(encoded)
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def b32decode(s, casefold=False, map01=None):
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s = _bytes_from_decode_data(s)
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quanta, leftover = divmod(len(s), 8)
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if leftover:
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raise binascii.Error('Incorrect padding')
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if map01 is not None:
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map01 = _bytes_from_decode_data(map01)
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assert len(map01) == 1, repr(map01)
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s = s.translate(bytes.maketrans(b'01', b'O' + map01))
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if casefold:
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s = s.upper()
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padchars = s.find(b'=')
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if padchars > 0:
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padchars = len(s) - padchars
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s = s[:-padchars]
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else:
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padchars = 0
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parts = []
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acc = 0
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shift = 35
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for c in s:
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val = _b32rev.get(c)
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if val is None:
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raise binascii.Error('Non-base32 digit found')
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acc += _b32rev[c] << shift
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shift -= 5
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if shift < 0:
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parts.append(binascii.unhexlify(bytes('%010x' % acc, "ascii")))
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acc = 0
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shift = 35
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last = binascii.unhexlify(bytes('%010x' % acc, "ascii"))
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if padchars == 0:
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last = b''
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elif padchars == 1:
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last = last[:-1]
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elif padchars == 3:
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last = last[:-2]
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elif padchars == 4:
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last = last[:-3]
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elif padchars == 6:
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last = last[:-4]
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else:
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raise binascii.Error('Incorrect padding')
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parts.append(last)
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return b''.join(parts)
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def b16encode(s):
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if not isinstance(s, bytes_types):
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raise TypeError("expected bytes, not %s" % s.__class__.__name__)
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return binascii.hexlify(s).upper()
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def b16decode(s, casefold=False):
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s = _bytes_from_decode_data(s)
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if casefold:
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s = s.upper()
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if re.search(b'[^0-9A-F]', s):
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raise binascii.Error('Non-base16 digit found')
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return binascii.unhexlify(s)
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MAXLINESIZE = 76
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MAXBINSIZE = (MAXLINESIZE//4)*3
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def encode(input, output):
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while True:
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s = input.read(MAXBINSIZE)
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if not s:
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break
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while len(s) < MAXBINSIZE:
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ns = input.read(MAXBINSIZE-len(s))
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if not ns:
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break
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s += ns
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line = binascii.b2a_base64(s)
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output.write(line)
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def decode(input, output):
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while True:
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line = input.readline()
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if not line:
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break
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s = binascii.a2b_base64(line)
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output.write(s)
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def encodebytes(s):
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if not isinstance(s, bytes_types):
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raise TypeError("expected bytes, not %s" % s.__class__.__name__)
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pieces = []
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for i in range(0, len(s), MAXBINSIZE):
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chunk = s[i : i + MAXBINSIZE]
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pieces.append(binascii.b2a_base64(chunk))
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return b"".join(pieces)
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def encodestring(s):
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import warnings
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warnings.warn("encodestring() is a deprecated alias, use encodebytes()",
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DeprecationWarning, 2)
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return encodebytes(s)
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def decodebytes(s):
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if not isinstance(s, bytes_types):
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raise TypeError("expected bytes, not %s" % s.__class__.__name__)
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return binascii.a2b_base64(s)
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def decodestring(s):
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import warnings
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warnings.warn("decodestring() is a deprecated alias, use decodebytes()",
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DeprecationWarning, 2)
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return decodebytes(s)
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def main():
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import sys, getopt
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'deut')
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except getopt.error as msg:
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sys.stdout = sys.stderr
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print(msg)
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print("""usage: %s [-d|-e|-u|-t] [file|-]
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-d, -u: decode
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-e: encode (default)
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-t: encode and decode string 'Aladdin:open sesame'"""%sys.argv[0])
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sys.exit(2)
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func = encode
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for o, a in opts:
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if o == '-e': func = encode
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if o == '-d': func = decode
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if o == '-u': func = decode
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if o == '-t': test(); return
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if args and args[0] != '-':
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with open(args[0], 'rb') as f:
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func(f, sys.stdout.buffer)
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else:
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func(sys.stdin.buffer, sys.stdout.buffer)
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def test():
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s0 = b"Aladdin:open sesame"
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print(repr(s0))
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s1 = encodebytes(s0)
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print(repr(s1))
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s2 = decodebytes(s1)
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print(repr(s2))
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assert s0 == s2
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if __name__ == '__main__':
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main()
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