Python: Trying To Split Instream Into Bit Sized Chunks
Currently I'm reading an instream and splicing it into 3 byte chunks:
instream_chunks = [instream[i:i+3]for i in range (0, len(instream), 3)]
What I'm failing to do is to split this instream into 22 bit sized chunks. Is there a way to do that in Python?
Edit: The instream is created (for test purposes) like this:
instream = open('C:/xxx/test.txt', 'rb+')
And this instream is then being used in this function
def write(self, instream: typ.BinaryIO):
Which starts with what I described above.
Assuming you have enough memory, you can convert the instream to a list of bits and then slice it however you want.
def access_bit(data, num): base = int(num/8) shift = num % 8 return (data[base] & (1<<shift)) >> shift def to_bits(instream): ba = bytearray(instream.read()) return [access_bit(ba,i) for i in range(len(ba)*8)]
[0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 0, 0, 0, 0]
Otherwise you'll have to read smaller chunks in multiple of size you want, and then use the above method on each. For example, you read 22*4 = 88 bits, or 11 bytes, and then call to_bits on that, split the resulting array into 4 22bit chunks, and repeat.
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