Decompile Lua bytecode in Data Explorer

The game has *tons* of Lua scripts for event scripting, and are very
interesting to explore. I had to do manually call luadec before, but now
it should be much easier by automatically decompiling Lua scripts in the
Data Explorer.

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "extern/dxbc"]
 	path = extern/dxbc
 	url = ../dxbc
+[submodule "extern/luadec51"]
+	path = extern/luadec51
+	url = ../luadec51

apps/sagasu/CMakeLists.txt

@@ -45,6 +45,7 @@ target_link_libraries(novus-sagasu
         Novus::TexPart
         Novus::DicPart
         Novus::MtrlPart
+        Novus::LuabPart
         Physis::Logger
         Qt6::Concurrent
         Qt6::Network)

apps/sagasu/src/mainwindow.cpp

@@ -25,6 +25,7 @@
 #include "filepropertieswindow.h"
 #include "filetypes.h"
 #include "hexpart.h"
+#include "luabpart.h"
 #include "mdlpart.h"
 #include "mtrlpart.h"
 #include "shpkpart.h"
@@ -173,6 +174,11 @@ void MainWindow::refreshParts(const QString &path)
         mtrlWidget->load(physis_material_parse(file));
         partHolder->addTab(mtrlWidget, i18nc("@title:tab", "Material"));
     } break;
+    case FileType::LuaBytecode: {
+        auto luabWidget = new LuabPart();
+        luabWidget->load(file);
+        partHolder->addTab(luabWidget, i18nc("@title:tab", "Lua"));
+    } break;
     default:
         break;
     }

common/include/filetypes.h

@@ -7,7 +7,20 @@
 
 #include "novuscommon_export.h"
 
-enum class FileType { Unknown, ExcelList, ExcelHeader, ExcelData, Model, Texture, ShaderPackage, CharaMakeParams, Skeleton, Dictionary, Material };
+enum class FileType {
+    Unknown,
+    ExcelList,
+    ExcelHeader,
+    ExcelData,
+    Model,
+    Texture,
+    ShaderPackage,
+    CharaMakeParams,
+    Skeleton,
+    Dictionary,
+    Material,
+    LuaBytecode
+};
 
 class NOVUSCOMMON_EXPORT FileTypes
 {

common/src/filetypes.cpp

@@ -15,7 +15,8 @@ const static QMap<QString, FileType> extensionToType{{QStringLiteral("exl"), Fil
                                                      {QStringLiteral("cmp"), FileType::CharaMakeParams},
                                                      {QStringLiteral("sklb"), FileType::Skeleton},
                                                      {QStringLiteral("dic"), FileType::Dictionary},
-                                                     {QStringLiteral("mtrl"), FileType::Material}};
+                                                     {QStringLiteral("mtrl"), FileType::Material},
+                                                     {QStringLiteral("luab"), FileType::LuaBytecode}};
 
 const static QMap<FileType, QString> typeToName{{FileType::Unknown, i18n("Unknown")},
                                                 {FileType::ExcelList, i18n("Excel List")},
@@ -27,7 +28,8 @@ const static QMap<FileType, QString> typeToName{{FileType::Unknown, i18n("Unknow
                                                 {FileType::CharaMakeParams, i18n("Chara Make Params")},
                                                 {FileType::Skeleton, i18n("Skeleton")},
                                                 {FileType::Dictionary, i18n("Dictionary")},
-                                                {FileType::Material, i18n("Material")}};
+                                                {FileType::Material, i18n("Material")},
+                                                {FileType::LuaBytecode, i18n("Lua Bytecode")}};
 
 const static QMap<FileType, QString> typeToIcon{{FileType::Unknown, QStringLiteral("unknown")},
                                                 {FileType::ExcelList, QStringLiteral("x-office-spreadsheet")},
@@ -39,7 +41,8 @@ const static QMap<FileType, QString> typeToIcon{{FileType::Unknown, QStringLiter
                                                 {FileType::CharaMakeParams, QStringLiteral("step_object_SoftBody-symbolic")},
                                                 {FileType::Skeleton, QStringLiteral("user-symbolic")},
                                                 {FileType::Dictionary, QStringLiteral("accessories-dictionary-symbolic")},
-                                                {FileType::Material, QStringLiteral("map-globe-symbolic")}};
+                                                {FileType::Material, QStringLiteral("map-globe-symbolic")},
+                                                {FileType::LuaBytecode, QStringLiteral("text-x-lua")}};
 
 FileType FileTypes::getFileType(const QString &extension)
 {

extern/CMakeLists.txt

@@ -23,3 +23,8 @@ add_subdirectory(magic_enum EXCLUDE_FROM_ALL)
 add_subdirectory(tinygltf EXCLUDE_FROM_ALL)
 add_subdirectory(imgui EXCLUDE_FROM_ALL)
 add_subdirectory(dxbc EXCLUDE_FROM_ALL)
+
+# For some reason, FFXIV uses a *32-bit* Lua compiler. We have to build it as 32-bit or else loading the bytecode fails.
+add_compile_options(-m32)
+add_link_options(-m32)
+add_subdirectory(luadec51 EXCLUDE_FROM_ALL)

extern/luadec51

@@ -0,0 +1 @@
+Subproject commit 94a5e2b8e08b2c0fdbefc46239b92f1bdcdac303

parts/CMakeLists.txt

@@ -11,3 +11,4 @@ add_subdirectory(mtrl)
 add_subdirectory(shpk)
 add_subdirectory(sklb)
 add_subdirectory(tex)
+add_subdirectory(luab)

parts/luab/CMakeLists.txt

@@ -0,0 +1,16 @@
+# SPDX-FileCopyrightText: 2025 Joshua Goins <josh@redstrate.com>
+# SPDX-License-Identifier: CC0-1.0
+
+add_library(luabpart STATIC)
+target_sources(luabpart PRIVATE luabpart.cpp)
+target_link_libraries(luabpart
+        PUBLIC
+        KF6::I18n
+        Physis::Physis
+        Qt6::Core
+        Qt6::Widgets)
+target_include_directories(luabpart PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+target_compile_definitions(luabpart PRIVATE TRANSLATION_DOMAIN="novus")
+add_dependencies(luabpart luadec)
+
+add_library(Novus::LuabPart ALIAS luabpart)

parts/luab/luabpart.cpp

@@ -0,0 +1,48 @@
+// SPDX-FileCopyrightText: 2025 Joshua Goins <josh@redstrate.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "luabpart.h"
+
+#include <QFile>
+#include <QJsonArray>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QProcess>
+#include <QTemporaryFile>
+#include <QTextEdit>
+#include <QVBoxLayout>
+#include <physis.hpp>
+
+LuabPart::LuabPart(QWidget *parent)
+    : QWidget(parent)
+{
+    auto layout = new QVBoxLayout();
+    layout->setContentsMargins(0, 0, 0, 0);
+
+    m_codeEdit = new QTextEdit();
+    m_codeEdit->setReadOnly(true);
+    layout->addWidget(m_codeEdit);
+
+    setLayout(layout);
+}
+
+void LuabPart::load(physis_Buffer buffer)
+{
+    QTemporaryFile temporaryFile;
+    if (temporaryFile.open()) {
+        QFile file(temporaryFile.fileName());
+        file.open(QIODevice::WriteOnly);
+        file.write(reinterpret_cast<const char *>(buffer.data), buffer.size);
+        file.close();
+
+        QProcess luaDecProcess;
+        luaDecProcess.setProgram(QStringLiteral("./luadec"));
+        luaDecProcess.setArguments({temporaryFile.fileName()});
+        luaDecProcess.start();
+        luaDecProcess.waitForFinished();
+
+        m_codeEdit->setText(QString::fromUtf8(luaDecProcess.readAllStandardOutput()));
+    }
+}
+
+#include "moc_luabpart.cpp"

parts/luab/luabpart.h

@@ -0,0 +1,24 @@
+// SPDX-FileCopyrightText: 2025 Joshua Goins <josh@redstrate.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <QTableWidget>
+#include <QWidget>
+#include <physis.hpp>
+
+class QTextEdit;
+
+class LuabPart : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit LuabPart(QWidget *parent = nullptr);
+
+    void load(physis_Buffer file);
+
+private:
+    GameData *data = nullptr;
+    QTextEdit *m_codeEdit = nullptr;
+};