mirror of https://github.com/bsnes-emu/bsnes.git
48 lines
1.0 KiB
C++
48 lines
1.0 KiB
C++
#pragma once
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namespace nall { namespace Decode {
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template<uint S = 1, uint M = 4 / S> //S = word size; M = match length
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inline auto RLE(const void* data, uint remaining = ~0) -> vector<uint8_t> {
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vector<uint8_t> output;
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auto input = (const uint8_t*)data;
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auto load = [&]() -> uint8_t {
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if(!remaining) return 0x00;
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return --remaining, *input++;
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};
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uint base = 0;
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uint64_t size = 0;
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for(uint byte : range(8)) size |= load() << byte * 8;
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output.resize(size);
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auto read = [&]() -> uint64_t {
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uint64_t value = 0;
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for(uint byte : range(S)) value |= load() << byte * 8;
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return value;
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};
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auto write = [&](uint64_t value) -> void {
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if(base >= size) return;
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for(uint byte : range(S)) output[base++] = value >> byte * 8;
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};
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while(base < size) {
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auto byte = load();
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if(byte < 128) {
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byte++;
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while(byte--) write(read());
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} else {
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auto value = read();
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byte = (byte & 127) + M;
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while(byte--) write(value);
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}
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}
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return output;
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}
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}}
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