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// Copyright 2021 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "DiscIO/GameModDescriptor.h"
#include <optional>
#include <string>
#include <string_view>
#include <vector>
#include <picojson.h>
#include "Common/IOFile.h"
#include "Common/MathUtil.h"
#include "Common/StringUtil.h"
namespace DiscIO
{
static std::string MakeAbsolute(const std::string& directory, const std::string& path)
{
return PathToString(StringToPath(directory) / StringToPath(path));
}
std::optional<GameModDescriptor> ParseGameModDescriptorFile(const std::string& filename)
{
::File::IOFile f(filename, "rb");
if (!f)
return std::nullopt;
std::vector<char> data;
data.resize(f.GetSize());
if (!f.ReadBytes(data.data(), data.size()))
return std::nullopt;
#ifdef _WIN32
std::string path = ReplaceAll(filename, "\\", "/");
#else
const std::string& path = filename;
#endif
return ParseGameModDescriptorString(std::string_view(data.data(), data.size()), path);
}
static std::vector<GameModDescriptorRiivolutionPatchOption>
ParseRiivolutionOptions(const picojson::array& array)
{
std::vector<GameModDescriptorRiivolutionPatchOption> options;
for (const auto& option_object : array)
{
if (!option_object.is<picojson::object>())
continue;
auto& option = options.emplace_back();
for (const auto& [key, value] : option_object.get<picojson::object>())
{
if (key == "section-name" && value.is<std::string>())
option.section_name = value.get<std::string>();
else if (key == "option-id" && value.is<std::string>())
option.option_id = value.get<std::string>();
else if (key == "option-name" && value.is<std::string>())
option.option_name = value.get<std::string>();
else if (key == "choice" && value.is<double>())
option.choice = MathUtil::SaturatingCast<u32>(value.get<double>());
}
}
return options;
}
static GameModDescriptorRiivolution ParseRiivolutionObject(const std::string& json_directory,
const picojson::object& object)
{
GameModDescriptorRiivolution r;
for (const auto& [element_key, element_value] : object)
{
if (element_key == "patches" && element_value.is<picojson::array>())
{
for (const auto& patch_object : element_value.get<picojson::array>())
{
if (!patch_object.is<picojson::object>())
continue;
auto& patch = r.patches.emplace_back();
for (const auto& [key, value] : patch_object.get<picojson::object>())
{
if (key == "xml" && value.is<std::string>())
patch.xml = MakeAbsolute(json_directory, value.get<std::string>());
else if (key == "root" && value.is<std::string>())
patch.root = MakeAbsolute(json_directory, value.get<std::string>());
else if (key == "options" && value.is<picojson::array>())
patch.options = ParseRiivolutionOptions(value.get<picojson::array>());
}
}
}
}
return r;
}
std::optional<GameModDescriptor> ParseGameModDescriptorString(std::string_view json,
std::string_view json_path)
{
std::string json_directory;
SplitPath(json_path, &json_directory, nullptr, nullptr);
picojson::value json_root;
std::string err;
picojson::parse(json_root, json.begin(), json.end(), &err);
if (!err.empty())
return std::nullopt;
if (!json_root.is<picojson::object>())
return std::nullopt;
GameModDescriptor descriptor;
bool is_game_mod_descriptor = false;
bool is_valid_version = false;
for (const auto& [key, value] : json_root.get<picojson::object>())
{
if (key == "type" && value.is<std::string>())
{
is_game_mod_descriptor = value.get<std::string>() == "dolphin-game-mod-descriptor";
}
else if (key == "version" && value.is<double>())
{
is_valid_version = value.get<double>() == 1.0;
}
else if (key == "base-file" && value.is<std::string>())
{
descriptor.base_file = MakeAbsolute(json_directory, value.get<std::string>());
}
else if (key == "display-name" && value.is<std::string>())
{
descriptor.display_name = value.get<std::string>();
}
else if (key == "maker" && value.is<std::string>())
{
descriptor.maker = value.get<std::string>();
}
else if (key == "banner" && value.is<std::string>())
{
descriptor.banner = MakeAbsolute(json_directory, value.get<std::string>());
}
else if (key == "riivolution" && value.is<picojson::object>())
{
descriptor.riivolution =
ParseRiivolutionObject(json_directory, value.get<picojson::object>());
}
}
if (!is_game_mod_descriptor || !is_valid_version)
return std::nullopt;
return descriptor;
}
static picojson::object
WriteGameModDescriptorRiivolution(const GameModDescriptorRiivolution& riivolution)
{
picojson::array json_patches;
for (const auto& patch : riivolution.patches)
{
picojson::object json_patch;
if (!patch.xml.empty())
json_patch["xml"] = picojson::value(patch.xml);
if (!patch.root.empty())
json_patch["root"] = picojson::value(patch.root);
if (!patch.options.empty())
{
picojson::array json_options;
for (const auto& option : patch.options)
{
picojson::object json_option;
if (!option.section_name.empty())
json_option["section-name"] = picojson::value(option.section_name);
if (!option.option_id.empty())
json_option["option-id"] = picojson::value(option.option_id);
if (!option.option_name.empty())
json_option["option-name"] = picojson::value(option.option_name);
json_option["choice"] = picojson::value(static_cast<double>(option.choice));
json_options.emplace_back(std::move(json_option));
}
json_patch["options"] = picojson::value(std::move(json_options));
}
json_patches.emplace_back(std::move(json_patch));
}
picojson::object json_riivolution;
json_riivolution["patches"] = picojson::value(std::move(json_patches));
return json_riivolution;
}
std::string WriteGameModDescriptorString(const GameModDescriptor& descriptor, bool pretty)
{
picojson::object json_root;
json_root["type"] = picojson::value("dolphin-game-mod-descriptor");
json_root["version"] = picojson::value(1.0);
if (!descriptor.base_file.empty())
json_root["base-file"] = picojson::value(descriptor.base_file);
if (!descriptor.display_name.empty())
json_root["display-name"] = picojson::value(descriptor.display_name);
if (!descriptor.maker.empty())
json_root["maker"] = picojson::value(descriptor.maker);
if (!descriptor.banner.empty())
json_root["banner"] = picojson::value(descriptor.banner);
if (descriptor.riivolution)
{
json_root["riivolution"] =
picojson::value(WriteGameModDescriptorRiivolution(*descriptor.riivolution));
}
return picojson::value(json_root).serialize(pretty);
}
bool WriteGameModDescriptorFile(const std::string& filename, const GameModDescriptor& descriptor,
bool pretty)
{
auto json = WriteGameModDescriptorString(descriptor, pretty);
if (json.empty())
return false;
::File::IOFile f(filename, "wb");
if (!f)
return false;
if (!f.WriteString(json))
return false;
return true;
}
} // namespace DiscIO
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