1 files changed, 87 insertions, 0 deletions
diff --git a/src/zencore/iohash.cpp b/src/zencore/iohash.cpp
new file mode 100644
index 000000000..77076c133
--- /dev/null
+++ b/src/zencore/iohash.cpp
@@ -0,0 +1,87 @@
+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#include <zencore/iohash.h>
+
+#include <zencore/blake3.h>
+#include <zencore/compositebuffer.h>
+#include <zencore/string.h>
+#include <zencore/testing.h>
+
+#include <gsl/gsl-lite.hpp>
+
+namespace zen {
+
+const IoHash IoHash::Zero{};  // Initialized to all zeros
+
+IoHash
+IoHash::HashBuffer(const void* data, size_t byteCount)
+{
+	BLAKE3 b3 = BLAKE3::HashMemory(data, byteCount);
+
+	IoHash io;
+	memcpy(io.Hash, b3.Hash, sizeof io.Hash);
+
+	return io;
+}
+
+IoHash
+IoHash::HashBuffer(const CompositeBuffer& Buffer)
+{
+	IoHashStream Hasher;
+
+	for (const SharedBuffer& Segment : Buffer.GetSegments())
+	{
+		Hasher.Append(Segment.GetData(), Segment.GetSize());
+	}
+
+	return Hasher.GetHash();
+}
+
+IoHash
+IoHash::FromHexString(const char* string)
+{
+	return FromHexString({string, sizeof(IoHash::Hash) * 2});
+}
+
+IoHash
+IoHash::FromHexString(std::string_view string)
+{
+	ZEN_ASSERT(string.size() == 2 * sizeof(IoHash::Hash));
+
+	IoHash io;
+
+	ParseHexBytes(string.data(), string.size(), io.Hash);
+
+	return io;
+}
+
+const char*
+IoHash::ToHexString(char* outString /* 40 characters + NUL terminator */) const
+{
+	ToHexBytes(Hash, sizeof(IoHash), outString);
+	outString[2 * sizeof(IoHash)] = '\0';
+
+	return outString;
+}
+
+StringBuilderBase&
+IoHash::ToHexString(StringBuilderBase& outBuilder) const
+{
+	String_t Str;
+	ToHexString(Str);
+
+	outBuilder.AppendRange(Str, &Str[StringLength]);
+
+	return outBuilder;
+}
+
+std::string
+IoHash::ToHexString() const
+{
+	String_t Str;
+	ToHexString(Str);
+
+	return Str;
+}
+
+}  // namespace zen