meta info store (#75)

- Feature: Added option `--gc-cache-attachment-store` which caches referenced attachments in cache records on disk for faster GC - default is `false`
- Feature: Added option `--gc-projectstore-attachment-store` which caches referenced attachments in project store oplogs on disk for faster GC - default is `false`

1 files changed, 32 insertions, 0 deletions

diff --git a/src/zenutil/referencemetadata.cpp b/src/zenutil/referencemetadata.cpp
new file mode 100644
index 000000000..bbcafcfba
--- /dev/null
+++ b/src/zenutil/referencemetadata.cpp
@@ -0,0 +1,32 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <zenutil/referencemetadata.h>
+//////////////////////////////////////////////////////////////////////////
+
+#include <zencore/xxhash.h>
+
+namespace zen {
+
+uint32_t
+ReferenceMetaDataHeader::ComputeChecksum() const
+{
+	return XXH32(&Magic, sizeof(ReferenceMetaDataHeader) - sizeof(uint32_t), 0xC0C0'BABA);
+}
+
+bool
+ReferenceMetaDataHeader::IsValid(uint32_t ExpectedMagic) const
+{
+	if (Magic != ExpectedMagic)
+	{
+		return false;
+	}
+
+	if (Checksum != ComputeChecksum())
+	{
+		return false;
+	}
+
+	return true;
+}
+
+}  // namespace zen