[Kernel] Added support for writing/reading GPD files

This breaks settings in games that are using them and savefiles in games that use settings to store progress

src/xenia/kernel/xam/user_property.cc

@@ -0,0 +1,75 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2024 Xenia Canary. All rights reserved.                          *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/kernel/xam/user_property.h"
+#include "xenia/base/logging.h"
+#include "xenia/kernel/util/shim_utils.h"
+
+namespace xe {
+namespace kernel {
+namespace xam {
+
+Property::Property() : UserData() {};
+
+Property::Property(const Property& property)
+    : UserData(property), property_id_(property.property_id_) {}
+
+Property::Property(uint32_t property_id, UserDataTypes property_data)
+    : UserData(get_type(property_id), property_data) {
+  property_id_ = static_cast<AttributeKey>(property_id);
+}
+
+Property::Property(uint32_t property_id, uint32_t value_size,
+                   uint8_t* value_ptr)
+    : UserData(get_type(property_id),
+               std::span<const uint8_t>(value_ptr, value_size)) {
+  property_id_.value = property_id;
+}
+
+Property::Property(const uint8_t* serialized_data, size_t data_size)
+    : UserData(X_USER_DATA_TYPE::CONTEXT, std::span<const uint8_t>({})) {}
+
+Property::~Property() {};
+
+std::vector<uint8_t> Property::Serialize() const {
+  std::vector<uint8_t> serialized_property(sizeof(XUSER_PROPERTY) +
+                                           extended_data_.size());
+
+  memcpy(serialized_property.data(), &property_id_, sizeof(AttributeKey));
+  memcpy(serialized_property.data() + sizeof(AttributeKey), &data_,
+         sizeof(X_USER_DATA));
+
+  if (requires_additional_data()) {
+    memcpy(
+        serialized_property.data() + sizeof(AttributeKey) + sizeof(X_USER_DATA),
+        extended_data_.data(), extended_data_.size());
+  }
+  return serialized_property;
+}
+
+void Property::WriteToGuest(XUSER_PROPERTY* property) const {
+  if (!property) {
+    return;
+  }
+
+  if (requires_additional_data()) {
+    property->data.type = data_.type;
+    property->data.data.binary.size =
+        static_cast<uint32_t>(extended_data_.size());
+
+    memcpy(kernel_memory()->TranslateVirtual(property->data.data.binary.ptr),
+           extended_data_.data(), extended_data_.size());
+  } else {
+    memcpy(&property->data, &data_, sizeof(X_USER_DATA));
+  }
+}
+
+}  // namespace xam
+}  // namespace kernel
+}  // namespace xe