first pass background asset loading - buggy

1 files changed, 18 insertions, 0 deletions

diff --git a/src/memory-type-defs.hpp b/src/memory-type-defs.hpp
index d9d6f5e..181b89b 100644
--- a/src/memory-type-defs.hpp
+++ b/src/memory-type-defs.hpp
@@ -6,6 +6,11 @@
 using PkeHandleBucketIndex_T = uint32_t;
 using PkeHandleItemIndex_T = uint32_t;
 
+const uint8_t PKE_HANDLE_VALIDATION_VALID = 0;
+const uint8_t PKE_HANDLE_VALIDATION_BUCKET_INDEX_TOO_HIGH = 1;
+const uint8_t PKE_HANDLE_VALIDATION_ITEM_INDEX_TOO_HIGH = 2;
+const uint8_t PKE_HANDLE_VALIDATION_VALUE_MAX = 3;
+
 struct PkeHandle {
 	union {
 		struct {
@@ -15,11 +20,24 @@ struct PkeHandle {
 		uint64_t hash = 0xFFFFFFFFFFFFFFFF;
 	};
 };
+constexpr PkeHandle PkeHandle_MAX = PkeHandle{};
 
 constexpr bool operator==(const PkeHandle &a, const PkeHandle &b) {
 	return a.hash == b.hash;
 }
 
+constexpr uint8_t ValidateHandle(PkeHandle handle, PkeHandle bucketHandle, uint64_t maxItems) {
+	if (handle == PkeHandle_MAX)
+		return PKE_HANDLE_VALIDATION_VALUE_MAX;
+	if (handle.bucketIndex > bucketHandle.bucketIndex)
+		return PKE_HANDLE_VALIDATION_BUCKET_INDEX_TOO_HIGH;
+	if (handle.itemIndex > maxItems)
+		return PKE_HANDLE_VALIDATION_ITEM_INDEX_TOO_HIGH;
+	if (handle.bucketIndex == bucketHandle.bucketIndex && handle.itemIndex > bucketHandle.itemIndex)
+		return PKE_HANDLE_VALIDATION_ITEM_INDEX_TOO_HIGH;
+	return PKE_HANDLE_VALIDATION_VALID;
+}
+
 struct MemBucket;
 
 #endif /* PKE_MEMORY_TYPE_DEFS_HPP */