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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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23
Task/Variable-length-quantity/Python/variable-length-quantity-1.py Normal file
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def tobits(n, _group=8, _sep='_', _pad=False):
'Express n as binary bits with separator'
bits = '{0:b}'.format(n)[::-1]
if _pad:
bits = '{0:0{1}b}'.format(n,
((_group+len(bits)-1)//_group)*_group)[::-1]
answer = _sep.join(bits[i:i+_group]
for i in range(0, len(bits), _group))[::-1]
answer = '0'*(len(_sep)-1) + answer
else:
answer = _sep.join(bits[i:i+_group]
for i in range(0, len(bits), _group))[::-1]
return answer
def tovlq(n):
return tobits(n, _group=7, _sep='1_', _pad=True)
def toint(vlq):
return int(''.join(vlq.split('_1')), 2)
def vlqsend(vlq):
for i, byte in enumerate(vlq.split('_')[::-1]):
print('Sent byte {0:3}: {1:#04x}'.format(i, int(byte,2)))

24
Task/Variable-length-quantity/Python/variable-length-quantity-2.py Normal file
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>>> for n in (254, 255, 256, 257, -2+(1<<16), -1+(1<<16), 1<<16, 1+(1<<16), 0x200000, 0x1fffff ):
print('int: %7i bin: %26s vlq: %35s vlq->int: %7i' % (n, tobits(n,_pad=True), tovlq(n), toint(tovlq(n))))
int: 254 bin: 11111110 vlq: 00000001_11111110 vlq->int: 254
int: 255 bin: 11111111 vlq: 00000001_11111111 vlq->int: 255
int: 256 bin: 00000001_00000000 vlq: 00000010_10000000 vlq->int: 256
int: 257 bin: 00000001_00000001 vlq: 00000010_10000001 vlq->int: 257
int: 65534 bin: 11111111_11111110 vlq: 00000011_11111111_11111110 vlq->int: 65534
int: 65535 bin: 11111111_11111111 vlq: 00000011_11111111_11111111 vlq->int: 65535
int: 65536 bin: 00000001_00000000_00000000 vlq: 00000100_10000000_10000000 vlq->int: 65536
int: 65537 bin: 00000001_00000000_00000001 vlq: 00000100_10000000_10000001 vlq->int: 65537
int: 2097152 bin: 00100000_00000000_00000000 vlq: 00000001_10000000_10000000_10000000 vlq->int: 2097152
int: 2097151 bin: 00011111_11111111_11111111 vlq: 01111111_11111111_11111111 vlq->int: 2097151
>>> vlqsend(tovlq(0x200000))
Sent byte 0: 0x80
Sent byte 1: 0x80
Sent byte 2: 0x80
Sent byte 3: 0x01
>>> vlqsend(tovlq(0x1fffff))
Sent byte 0: 0xff
Sent byte 1: 0xff
Sent byte 2: 0x7f
>>>