bsnes/nall/encode/mtf.hpp

31 lines
576 B
C++

#pragma once
//move to front
namespace nall::Encode {
inline auto MTF(array_view<uint8_t> input) -> vector<uint8_t> {
vector<uint8_t> output;
output.resize(input.size());
uint8_t order[256];
for(uint n : range(256)) order[n] = n;
for(uint offset : range(input.size())) {
uint data = input[offset];
for(uint index : range(256)) {
uint value = order[index];
if(value == data) {
output[offset] = index;
memory::move(&order[1], &order[0], index);
order[0] = value;
break;
}
}
}
return output;
}
}