From c71ded584951b0f2da508f05d7210fea1c9e32b0 Mon Sep 17 00:00:00 2001
From: lnd3 <linus.cumselius@gmail.com>
Date: Sat, 12 Oct 2024 19:51:37 +0200
Subject: [PATCH] Add utility functions to find correct sequential cache
 entries.

---
 packages/storage/include/storage/SequentialCache.h |  3 +++
 packages/storage/source/common/SequentialCache.cpp | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/packages/storage/include/storage/SequentialCache.h b/packages/storage/include/storage/SequentialCache.h
index 39681126..c5035bc9 100644
--- 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
index 203f875e..8d9422a1 100644
--- 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();