Refactoring vfs to remove a lot of duplicated code.

Progress on #294.

src/xenia/vfs/device.cc

@@ -9,6 +9,8 @@
 
 #include "xenia/vfs/device.h"
 
+#include "xenia/base/logging.h"
+
 namespace xe {
 namespace vfs {
 
@@ -16,5 +18,31 @@ Device::Device(const std::string& mount_path) : mount_path_(mount_path) {}
 
 Device::~Device() = default;
 
+void Device::Dump(StringBuffer* string_buffer) {
+  if (root_entry_) {
+    root_entry_->Dump(string_buffer, 0);
+  }
+}
+
+Entry* Device::ResolvePath(const char* path) {
+  // The filesystem will have stripped our prefix off already, so the path will
+  // be in the form:
+  // some\PATH.foo
+
+  XELOGFS("Device::ResolvePath(%s)", path);
+
+  // Walk the path, one separator at a time.
+  auto entry = root_entry_.get();
+  auto path_parts = xe::split_path(path);
+  for (auto& part : path_parts) {
+    entry = entry->GetChild(part);
+    if (!entry) {
+      // Not found.
+      return nullptr;
+    }
+  }
+  return entry;
+}
+
 }  // namespace vfs
 }  // namespace xe