Add utility functions to find correct sequential cache entries.

lnd3 · Oct 12, 2024 · c71ded5 · c71ded5
1 parent 1815c4b
commit c71ded5
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Showing 2 changed files with 13 additions and 0 deletions.
diff --git a/packages/storage/include/storage/SequentialCache.h b/packages/storage/include/storage/SequentialCache.h
@@ -18,6 +18,9 @@
 namespace l::filecache {
 
 	int32_t GetClampedPosition(int32_t position, int32_t blockWidth);
+	int32_t GetClampedPositionOffset(int32_t position, int32_t blockWidth);
+	int32_t GetClampedIndex(int32_t position, int32_t blockWidth, int32_t numBlockEntries);
+
 	std::string GetCacheBlockName(
 		std::string_view prefix, 
 		int32_t blockWidth, 

diff --git a/packages/storage/source/common/SequentialCache.cpp b/packages/storage/source/common/SequentialCache.cpp
@@ -7,6 +7,16 @@ namespace l::filecache {
 		return blockWidth * (position / blockWidth);
 	}
 
+	int32_t GetClampedPositionOffset(int32_t position, int32_t blockWidth) {
+		return position - blockWidth * (position / blockWidth);
+	}
+
+	int32_t GetClampedIndex(int32_t position, int32_t blockWidth, int32_t numBlockEntries) {
+		auto clampPosition = GetClampedPosition(position, blockWidth);
+		auto clampedOffset = position - clampPosition;
+		return numBlockEntries * clampedOffset / blockWidth;
+	}
+
 	std::string GetCacheBlockName(std::string_view prefix, int32_t blockWidth, int32_t clampedPos) {
 		std::stringstream name;
 		name << prefix.data();