1 files changed, 50 insertions, 0 deletions

diff --git a/C/Xxh64.h b/C/Xxh64.h
new file mode 100644
index 0000000..efef65e
--- /dev/null
+++ b/C/Xxh64.h
@@ -0,0 +1,50 @@
+/* Xxh64.h -- XXH64 hash calculation interfaces
+2023-08-18 : Igor Pavlov : Public domain */
+
+#ifndef ZIP7_INC_XXH64_H
+#define ZIP7_INC_XXH64_H
+
+#include "7zTypes.h"
+
+EXTERN_C_BEGIN
+
+#define Z7_XXH64_BLOCK_SIZE  (4 * 8)
+
+typedef struct
+{
+  UInt64 v[4];
+} CXxh64State;
+
+void Xxh64State_Init(CXxh64State *p);
+
+// end != data && end == data + Z7_XXH64_BLOCK_SIZE * numBlocks
+void Z7_FASTCALL Xxh64State_UpdateBlocks(CXxh64State *p, const void *data, const void *end);
+
+/*
+Xxh64State_Digest():
+data:
+  the function processes only
+    (totalCount & (Z7_XXH64_BLOCK_SIZE - 1)) bytes in (data): (smaller than 32 bytes).
+totalCount: total size of hashed stream:
+  it includes total size of data processed by previous Xxh64State_UpdateBlocks() calls,
+  and it also includes current processed size in (data).
+*/
+UInt64 Xxh64State_Digest(const CXxh64State *p, const void *data, UInt64 totalCount);
+
+
+typedef struct
+{
+  CXxh64State state;
+  UInt64 count;
+  UInt64 buf64[4];
+} CXxh64;
+
+void Xxh64_Init(CXxh64 *p);
+void Xxh64_Update(CXxh64 *p, const void *data, size_t size);
+
+#define Xxh64_Digest(p) \
+  Xxh64State_Digest(&(p)->state, (p)->buf64, (p)->count)
+
+EXTERN_C_END
+
+#endif