Avoid 0(N²) in Sasquatch writer

Bigfoot/Sources/Engine/Include/Engine/Sasquatch/Sasquatch.hpp

@@ -107,6 +107,11 @@ class SasquatchWriter
      */
     std::size_t m_prefetchedUpTo;
 
+    /**
+     * Current write position in the data region
+     */
+    std::size_t m_currentDataOffset;
+
     /**
      * The Sasquatch file being written, mapped at its final size
      */

Bigfoot/Sources/Engine/Sasquatch/Sasquatch.cpp

@@ -20,6 +20,7 @@ SasquatchWriter::SasquatchWriter(const File& p_file,
                                  const std::size_t p_totalHardReferencesBytes):
     m_assetCount(p_assetCount),
     m_prefetchedUpTo(0),
+    m_currentDataOffset(sizeof(SasquatchHeader) + m_assetCount * sizeof(SasquatchEntry)),
     m_file(p_file,
            sizeof(SasquatchHeader) + m_assetCount * sizeof(SasquatchEntry) + p_totalFlatbufferBytes +
                p_totalHardReferencesBytes)
@@ -63,13 +64,7 @@ void SasquatchWriter::WriteAsset(const UUID& p_uuid,
            "SasquatchWriter can only hold {} assets",
            m_assetCount);
 
-    const std::size_t offset = std::accumulate(m_entries.begin(),
-                                               m_entries.end(),
-                                               sizeof(SasquatchHeader) + m_assetCount * sizeof(SasquatchEntry),
-                                               [](const std::size_t p_value, const SasquatchEntry& p_entry)
-                                               {
-                                                   return p_value + p_entry.m_assetSize + p_entry.m_hardReferencesSize;
-                                               });
+    const std::size_t offset = m_currentDataOffset;
 
     const eastl::span<std::byte> data = m_file.GetData();
     ASSERT(EngineAssertHandler,
@@ -102,6 +97,7 @@ void SasquatchWriter::WriteAsset(const UUID& p_uuid,
                     UUID::UUID_BYTE_SIZE);
     }
 
+    m_currentDataOffset += entry.m_assetSize + entry.m_hardReferencesSize;
     m_entries.push_back(entry);
 }