From a6e75cd45b75a202eed1a68692e33e7732789dd2 Mon Sep 17 00:00:00 2001
From: Zach Hilman <zachhilman@gmail.com>
Date: Tue, 28 Aug 2018 22:37:42 -0400
Subject: bktr: Implement IVFC offset shifting Fixes base game read errors

---
 src/core/loader/loader.h | 9 +++++++++
 src/core/loader/nca.cpp  | 6 ++++++
 src/core/loader/nca.h    | 1 +
 3 files changed, 16 insertions(+)

(limited to 'src/core/loader')

diff --git a/src/core/loader/loader.h b/src/core/loader/loader.h
index 225c05127..843c4bb91 100644
--- a/src/core/loader/loader.h
+++ b/src/core/loader/loader.h
@@ -214,6 +214,15 @@ public:
         return true;
     }
 
+    /**
+     * Gets the difference between the start of the IVFC header and the start of level 6 (RomFS)
+     * data. Needed for bktr patching.
+     * @return IVFC offset for romfs.
+     */
+    virtual u64 ReadRomFSIVFCOffset() const {
+        return 0;
+    }
+
     /**
      * Get the title of the application
      * @param title Reference to store the application title into
diff --git a/src/core/loader/nca.cpp b/src/core/loader/nca.cpp
index 6b1c27b47..6aaffae59 100644
--- a/src/core/loader/nca.cpp
+++ b/src/core/loader/nca.cpp
@@ -71,6 +71,12 @@ ResultStatus AppLoader_NCA::ReadRomFS(FileSys::VirtualFile& dir) {
     return ResultStatus::Success;
 }
 
+u64 AppLoader_NCA::ReadRomFSIVFCOffset() const {
+    if (nca == nullptr)
+        return 0;
+    return nca->GetBaseIVFCOffset();
+}
+
 ResultStatus AppLoader_NCA::ReadProgramId(u64& out_program_id) {
     if (nca == nullptr || nca->GetStatus() != ResultStatus::Success)
         return ResultStatus::ErrorNotInitialized;
diff --git a/src/core/loader/nca.h b/src/core/loader/nca.h
index 326f84857..10be197c4 100644
--- a/src/core/loader/nca.h
+++ b/src/core/loader/nca.h
@@ -37,6 +37,7 @@ public:
     ResultStatus Load(Kernel::SharedPtr<Kernel::Process>& process) override;
 
     ResultStatus ReadRomFS(FileSys::VirtualFile& dir) override;
+    u64 ReadRomFSIVFCOffset() const override;
     ResultStatus ReadProgramId(u64& out_program_id) override;
 
 private:
-- 
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