From ec362948f458ac82db0cf184ff55530d2d04f53f Mon Sep 17 00:00:00 2001
From: georgemoralis <giorgosmrls@gmail.com>
Date: Thu, 19 Oct 2023 17:52:49 +0300
Subject: [PATCH] more draft fs

---
 .../FileSystem/generic_file_system.h          |  2 +
 .../LibKernel/FileSystem/meta_file_system.cpp | 44 ++++++++++++++++---
 .../LibKernel/FileSystem/meta_file_system.h   | 14 ++++--
 3 files changed, 51 insertions(+), 9 deletions(-)

diff --git a/src/Emulator/HLE/Libraries/LibKernel/FileSystem/generic_file_system.h b/src/Emulator/HLE/Libraries/LibKernel/FileSystem/generic_file_system.h
index c43f15a5..424f1498 100644
--- a/src/Emulator/HLE/Libraries/LibKernel/FileSystem/generic_file_system.h
+++ b/src/Emulator/HLE/Libraries/LibKernel/FileSystem/generic_file_system.h
@@ -19,6 +19,8 @@ class GenericHandleAllocator {
 };
 
 class AbstractFileSystem {
+  public:
+    virtual bool ownsHandle(u32 handle) = 0;
     virtual u32 openFile(std::string filename, FileAccess access) = 0;
     virtual void closeFile(u32 handle) = 0;
 };
diff --git a/src/Emulator/HLE/Libraries/LibKernel/FileSystem/meta_file_system.cpp b/src/Emulator/HLE/Libraries/LibKernel/FileSystem/meta_file_system.cpp
index bcf17192..9750ee51 100644
--- a/src/Emulator/HLE/Libraries/LibKernel/FileSystem/meta_file_system.cpp
+++ b/src/Emulator/HLE/Libraries/LibKernel/FileSystem/meta_file_system.cpp
@@ -2,19 +2,51 @@
 
 namespace Emulator::Host::GenericFS {
 
-void MetaFileSystem::mount(std::string prefix, AbstractFileSystem* system) {}
+void MetaFileSystem::mount(std::string prefix, AbstractFileSystem* system) {
+    System x;
+    x.prefix = prefix;
+    x.system = system;
+    fileSystems.push_back(x);
+}
 
 void MetaFileSystem::unMount(AbstractFileSystem* system) {}
 
-void MetaFileSystem::unMountAll() {}
+void MetaFileSystem::unMountAll() { fileSystems.clear(); }
 
-bool MetaFileSystem::mapFilePath(std::string inpath, std::string* outpath, AbstractFileSystem** system) { return false; }
+AbstractFileSystem* MetaFileSystem::getHandleOwner(u32 handle) { 
+	for (u32 i = 0; i < fileSystems.size(); i++) {
+        if (fileSystems[i].system->ownsHandle(handle)) return fileSystems[i].system;  // got it!
+    }
+	return nullptr; 
 
-void MetaFileSystem::releaseHandle(u32 handle) {}
+}
 
-u32 MetaFileSystem::openFile(std::string filename, FileAccess access) { return u32(); }
+bool MetaFileSystem::mapFilePath(std::string inpath, std::string* outpath, AbstractFileSystem** system) { 
+    for (unsigned int i = 0; i < fileSystems.size(); i++) {
+        int prefLen = fileSystems[i].prefix.size();
+        if (fileSystems[i].prefix == inpath.substr(0, prefLen))
+        {
+            *outpath = inpath.substr(prefLen);
+            *system = fileSystems[i].system;
+            return true;
+        }
+    }
+    return false;
+}
 
-void MetaFileSystem::closeFile(u32 handle) {}
+u32 MetaFileSystem::openFile(std::string filename, FileAccess access) { 
+    AbstractFileSystem* system;
+    std::string of;
+    if (mapFilePath(filename, &of, &system)) {
+        return system->openFile(of, access);
+    }
+    return 0;
+}
+
+void MetaFileSystem::closeFile(u32 handle) {
+    AbstractFileSystem* sys = getHandleOwner(handle);
+    if (sys) sys->closeFile(handle);
+}
 
 
 }  // namespace Emulator::Host::GenericFS
\ No newline at end of file
diff --git a/src/Emulator/HLE/Libraries/LibKernel/FileSystem/meta_file_system.h b/src/Emulator/HLE/Libraries/LibKernel/FileSystem/meta_file_system.h
index 17b959c9..83b04744 100644
--- a/src/Emulator/HLE/Libraries/LibKernel/FileSystem/meta_file_system.h
+++ b/src/Emulator/HLE/Libraries/LibKernel/FileSystem/meta_file_system.h
@@ -1,7 +1,9 @@
 #pragma once
 #include <types.h>
+
 #include <string>
 #include <vector>
+
 #include "generic_file_system.h"
 
 namespace Emulator::Host::GenericFS {
@@ -15,6 +17,7 @@ class MetaFileSystem : public GenericHandleAllocator, AbstractFileSystem {
     u32 current;
     std::vector<System> fileSystems;
     std::string currentDirectory;
+    std::vector<u32> handler;
 
   public:
     MetaFileSystem() : current(0) {}
@@ -24,9 +27,14 @@ class MetaFileSystem : public GenericHandleAllocator, AbstractFileSystem {
     void unMountAll();
     AbstractFileSystem *getHandleOwner(u32 handle);
     bool mapFilePath(std::string inpath, std::string *outpath, AbstractFileSystem **system);
-    u32 requestHandle() { return ++current; }
-    void releaseHandle(u32 handle);
+    u32 requestHandle() {
+        handler.push_back(current);
+        current++;
+        return handler.back();
+    }
+    void releaseHandle(u32 handle) { handler.erase(std::remove(handler.begin(), handler.end(), handle), handler.end()); }
+    bool ownsHandle(u32 handle) { return false; }
     u32 openFile(std::string filename, FileAccess access);
     void closeFile(u32 handle);
 };
-}
\ No newline at end of file
+}  // namespace Emulator::Host::GenericFS
\ No newline at end of file