It looks to me like you're reinventing base64 encoding:

No more like the reverse of it. This format compresses four numerical values 0..63 into 3 bytes.

As you say, in base64, you start with 3 bytes 0..255 and expand them to 4 bytes 65+(0..63). The purpose is to avoid the transmission of control characters that might upset protocols.

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In reply to Re^2: unpacking 6-bit values by BrowserUk
in thread unpacking 6-bit values by BrowserUk

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