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// Godot save decoder algorithm by Chris Souvey.
#include "godot_variant.h"
#include <algorithm>
#include <charconv>
#include <cstddef>
#include <cstdint>
#include <fstream>
#include <string>
#include <tuple>
#include <variant>
#include <vector>
namespace {
uint16_t ReadUint16(std::basic_istream<char>& stream) {
uint16_t result;
stream.read(reinterpret_cast<char*>(&result), 2);
return result;
}
uint32_t ReadUint32(std::basic_istream<char>& stream) {
uint32_t result;
stream.read(reinterpret_cast<char*>(&result), 4);
return result;
}
GodotVariant ParseVariant(std::basic_istream<char>& stream) {
uint16_t type = ReadUint16(stream);
stream.ignore(2);
switch (type) {
case 1: {
// bool
bool boolval = (ReadUint32(stream) == 1);
return {boolval};
}
case 15: {
// nodepath
uint32_t name_length = ReadUint32(stream) & 0x7fffffff;
uint32_t subname_length = ReadUint32(stream) & 0x7fffffff;
uint32_t flags = ReadUint32(stream);
std::vector<std::string> result;
for (size_t i = 0; i < name_length + subname_length; i++) {
uint32_t char_length = ReadUint32(stream);
uint32_t padded_length = (char_length % 4 == 0)
? char_length
: (char_length + 4 - (char_length % 4));
std::vector<char> next_bytes(padded_length);
stream.read(next_bytes.data(), padded_length);
std::string next_piece;
std::copy(next_bytes.begin(),
std::next(next_bytes.begin(), char_length),
std::back_inserter(next_piece));
result.push_back(next_piece);
}
return {result};
}
case 19: {
// array
uint32_t length = ReadUint32(stream) & 0x7fffffff;
std::vector<GodotVariant> result;
for (size_t i = 0; i < length; i++) {
result.push_back(ParseVariant(stream));
}
return {result};
}
default: {
// eh
return {std::monostate{}};
}
}
}
} // namespace
GodotVariant ParseGodotFile(std::string filename) {
std::ifstream file_stream(filename, std::ios_base::binary);
file_stream.ignore(4);
return ParseVariant(file_stream);
}
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