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#include "Decompressor.h"
#include <stdexcept>
#include "spdlog/spdlog.h"
#include <Companion.h>
extern "C" {
#include <libmio0/mio0.h>
}
std::unordered_map<uint32_t, DataChunk*> gCachedChunks;
DataChunk* Decompressor::Decode(const std::vector<uint8_t>& buffer, const uint32_t offset, const CompressionType type) {
if(gCachedChunks.contains(offset)){
return gCachedChunks[offset];
}
const unsigned char* in_buf = buffer.data() + offset;
switch (type) {
case CompressionType::MIO0: {
mio0_header_t head;
if(!mio0_decode_header(in_buf, &head)){
throw std::runtime_error("Failed to decode MIO0 header");
}
const auto decompressed = new uint8_t[head.dest_size];
mio0_decode(in_buf, decompressed, nullptr);
gCachedChunks[offset] = new DataChunk{ decompressed, head.dest_size };
return gCachedChunks[offset];
}
default:
throw std::runtime_error("Unknown compression type");
}
}
DecompressedData Decompressor::AutoDecode(YAML::Node& node, std::vector<uint8_t>& buffer) {
if(!node["offset"]){
throw std::runtime_error("Failed to find offset");
}
const auto offset = TranslateAddr(node["offset"].as<uint32_t>());
if(node["mio0"]){
const auto mio0 = node["mio0"].as<uint32_t>();
auto decoded = Decode(buffer, offset, CompressionType::MIO0);
auto size = node["size"] ? node["size"].as<size_t>() : decoded->size - mio0;
return {
.root = decoded,
.segment = { decoded->data + mio0, size }
};
}
if(node["yay0"]){
throw std::runtime_error("Yay0 not implemented");
}
if(node["yaz0"]){
throw std::runtime_error("Yaz0 not implemented");
}
return {
.root = nullptr,
.segment = { buffer.data() + offset, buffer.size() - offset }
};
}
uint32_t Decompressor::TranslateAddr(uint32_t addr){
if(IS_SEGMENTED(addr)){
const auto segment = Companion::Instance->GetSegmentedAddr(SEGMENT_NUMBER(addr));
if(!segment.has_value()) {
SPDLOG_ERROR("Segment data missing from game config\nPlease add an entry for segment {}", SEGMENT_NUMBER(addr));
return 0;
}
return segment.value() + SEGMENT_OFFSET(addr);
}
return addr;
}
bool Decompressor::IsSegmented(uint32_t addr) {
if(IS_SEGMENTED(addr)){
const auto segment = Companion::Instance->GetSegmentedAddr(SEGMENT_NUMBER(addr));
if(!segment.has_value()) {
SPDLOG_ERROR("Segment data missing from game config\nPlease add an entry for segment {}", SEGMENT_NUMBER(addr));
return false;
}
return true;
}
return false;
}
bool Decompressor::IsCompressed(YAML::Node& node) {
return node["mio0"] || node["yay0"] || node["yaz0"];
}
void Decompressor::CopyCompression(YAML::Node& from, YAML::Node& to){
if(from["mio0"]){
to["mio0"] = from["mio0"];
}
if(from["yay0"]){
to["yay0"] = from["yay0"];
}
if(from["yaz0"]){
to["yaz0"] = from["yaz0"];
}
}
void Decompressor::ClearCache() {
for(auto& [key, value] : gCachedChunks){
delete value->data;
}
gCachedChunks.clear();
}
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