Bytestream decoder?

[rasky]

Would it be possible to add an option to Shrinkler to avoid having to fetch one bit at a time during decoding? I'm working on a port to a MIPS platform where bit management in general isn't very fast. In particular this hot loop:

    while (ctx->intervalsize < 0x8000) {
        ctx->intervalsize <<= 1;
        ctx->intervalvalue = (ctx->intervalvalue << 1) | shr_get_bit(ctx);
    }

in the range decoder seems to take lot of time. If it was possible to instead fetch one byte at a time, that would be great.

upkr has a similar functionality:
https://github.com/exoticorn/upkr/blob/f647449497967dc682b9cd3d47e8857f8fa886f0/c_unpacker/unpack.c#L15-L30