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// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
#include "ryujinx_compat.h"
#include "common/fs/path_util.h"
#include <cstddef>
#include <cstring>
#include <fmt/ranges.h>
#include <fstream>
namespace Common::FS {
namespace fs = std::filesystem;
fs::path GetKvdbPath()
{
return GetLegacyPath(EmuPath::RyujinxDir) / "bis" / "system" / "save" / "8000000000000000" / "0"
/ "imkvdb.arc";
}
fs::path GetRyuSavePath(const u64 &save_id)
{
std::string hex = fmt::format("{:016x}", save_id);
// TODO: what's the difference between 0 and 1?
return GetLegacyPath(EmuPath::RyujinxDir) / "bis" / "user" / "save" / hex / "0";
}
IMENReadResult ReadKvdb(const fs::path &path, std::vector<IMEN> &imens)
{
std::ifstream kvdb{path, std::ios::binary | std::ios::ate};
if (!kvdb) {
return IMENReadResult::Nonexistent;
}
size_t file_size = kvdb.tellg();
// IMKV header + 8 bytes
if (file_size < 0xB) {
return IMENReadResult::NoHeader;
}
// magic (not the wizard kind)
kvdb.seekg(0, std::ios::beg);
char header[12];
kvdb.read(header, 12);
if (std::memcmp(header, IMKV_MAGIC, 4) != 0) {
return IMENReadResult::InvalidMagic;
}
// calculate num. of imens left
std::size_t remaining = (file_size - 12);
std::size_t num_imens = remaining / IMEN_SIZE;
// File is misaligned and probably corrupt (rip)
if (remaining % IMEN_SIZE != 0) {
return IMENReadResult::Misaligned;
}
// if there aren't any IMENs, it's empty and we can safely no-op out of here
if (num_imens == 0) {
return IMENReadResult::NoImens;
}
imens.reserve(num_imens);
// initially I wanted to do a struct, but imkvdb is 140 bytes
// while the compiler will murder you if you try to align u64 to 4 bytes
for (std::size_t i = 0; i < num_imens; ++i) {
char magic[4];
u64 title_id = 0;
u64 save_id = 0;
kvdb.read(magic, 4);
if (std::memcmp(magic, IMEN_MAGIC, 4) != 0) {
return IMENReadResult::InvalidMagic;
}
kvdb.ignore(0x8);
kvdb.read(reinterpret_cast<char *>(&title_id), 8);
kvdb.ignore(0x38);
kvdb.read(reinterpret_cast<char *>(&save_id), 8);
kvdb.ignore(0x38);
imens.emplace_back(IMEN{title_id, save_id});
}
return IMENReadResult::Success;
}
} // namespace Common::FS
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