base128 0.1.1
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Description:
base128 0.1.1
If called from command line, this encodes a binary file into base128.If imported from python it provides a base128 class to do the same.An instance of base128 can be used to convert to and from base128 encoding.Encoding: The python package bitarray is used to insert a 0 bit every 8bits of the data. Bitarray cares to shift the bits to make room for thenew bit. This is done in chunks. The length in bits mod 8 can become greater than zero for chunks of sizenot equal to a multiple of 7. So ``chunksize`` must be a multiple of 7.Even if ``chunksize`` is a multiple of 7 the last chunk likely has to be padded to reach a multiple of 8 after encoding.The amount of padding can be expressed as a function of the original datalength mod ``chunksize`` (``modchunk``). ``modchunk`` is added as anadditional byte at the end of the encoding. To make this byte alsobase128, we require ``chunksize``<=128.If ``chars`` is provided, the resulting 7-bit numbers are used as indices to map to entries of ``chars``. With bytes ``chars`` the resulting chunks will be integer lists and possibly still need to be typed to bytes for further processing:: with open('tstenc.txt','wb') as f: f.write(b'\n'.join([bytes(x) for x in encoded]))
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