mirror of https://github.com/bsnes-emu/bsnes.git
37 lines
804 B
C++
37 lines
804 B
C++
#pragma once
|
|
|
|
namespace nall { namespace Decode {
|
|
|
|
inline auto Huffman(array_view<uint8_t> input) -> vector<uint8_t> {
|
|
vector<uint8_t> output;
|
|
|
|
uint size = 0;
|
|
for(uint byte : range(8)) size |= *input++ << byte * 8;
|
|
output.reserve(size);
|
|
|
|
uint byte = 0, bits = 0;
|
|
auto read = [&]() -> bool {
|
|
if(bits == 0) bits = 8, byte = *input++;
|
|
return byte >> --bits & 1;
|
|
};
|
|
|
|
uint nodes[256][2] = {};
|
|
for(uint offset : range(256)) {
|
|
for(uint index : range(9)) nodes[offset][0] = nodes[offset][0] << 1 | read();
|
|
for(uint index : range(9)) nodes[offset][1] = nodes[offset][1] << 1 | read();
|
|
}
|
|
|
|
uint node = 511;
|
|
while(output.size() < size) {
|
|
node = nodes[node - 256][read()];
|
|
if(node < 256) {
|
|
output.append(node);
|
|
node = 511;
|
|
}
|
|
}
|
|
|
|
return output;
|
|
}
|
|
|
|
}}
|