minimal no_std fork of integer-encoding
The format is described here: Google's protobuf integer encoding technique.
Please feel free to use cargo bench to determine the rate at which your
machine can encode and decode varints and fixedints. Note that one iteration
comprises each eight rounds of encoding (or decoding) a signed and an unsigned
integer each -- divide the resulting benchmark time by 16 in order to have a
rough estimate of time per operation. The integers are very large, so the
results represent the worst case.
VarInt encodes integers in blocks of 7 bits; the MSB is set for every byte but
the last, in which it is cleared.
Signed values are first converted to an unsigned representation using zigzag encoding (also described on the page linked above), and then encoded as every other unsigned number.