Fixing path issues for host FS.

src/xenia/kernel/fs/devices/host_path_device.cc

@@ -9,6 +9,7 @@
 
 #include "xenia/kernel/fs/devices/host_path_device.h"
 
+#include "poly/fs.h"
 #include "xenia/kernel/fs/devices/host_path_entry.h"
 #include "xenia/kernel/objects/xfile.h"
 
@@ -33,8 +34,11 @@ std::unique_ptr<Entry> HostPathDevice::ResolvePath(const char* path) {
   auto full_path = poly::join_paths(local_path_, rel_path);
   full_path = poly::fix_path_separators(full_path);
 
+  if (!poly::fs::PathExists(full_path)) {
+    return nullptr;
+  }
+
   // TODO(benvanik): get file info
-  // TODO(benvanik): fail if does not exit
   // TODO(benvanik): switch based on type
 
   return std::make_unique<HostPathEntry>(this, path, full_path);

src/xenia/kernel/fs/devices/host_path_entry.cc

@@ -74,9 +74,9 @@ X_STATUS HostPathEntry::QueryDirectory(XDirectoryInfo* out_info, size_t length,
   if (handle == INVALID_HANDLE_VALUE) {
     std::wstring target_path = local_path_;
     if (!file_name) {
-      target_path += L"*";
+      target_path = poly::join_paths(target_path, L"*");
     } else {
-      target_path += poly::to_wstring(file_name);
+      target_path = poly::join_paths(target_path, poly::to_wstring(file_name));
     }
     handle = find_file_ = FindFirstFile(target_path.c_str(), &ffd);
     if (handle == INVALID_HANDLE_VALUE) {

src/xenia/kernel/xboxkrnl_io.cc

@@ -117,9 +117,9 @@ X_STATUS NtCreateFile(PPCContext* ppc_state, KernelState* state,
   } else {
     // Open the file/directory.
     result = fs->Open(std::move(entry), state,
-                      desired_access == FileAccess::X_GENERIC_READ
-                          ? fs::Mode::READ
-                          : fs::Mode::READ_WRITE,
+                      desired_access & FileAccess::X_GENERIC_WRITE
+                          ? fs::Mode::READ_WRITE
+                          : fs::Mode::READ,
                       false,  // TODO(benvanik): pick async mode, if needed.
                       &file);
   }