intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 32 insertions, 0 deletions

diff --git a/library/cpp/codecs/static/common.h b/library/cpp/codecs/static/common.h
new file mode 100644
index 0000000000..211de2a27d
--- /dev/null
+++ b/library/cpp/codecs/static/common.h
@@ -0,0 +1,32 @@
+#pragma once
+
+#include <util/string/hex.h>
+#include <util/digest/city.h>
+#include <util/system/byteorder.h>
+
+namespace NCodecs {
+    template <class T>
+    ui64 DataSignature(const T& t) {
+        static_assert(!std::is_scalar<T>::value, "no scalars");
+        return CityHash64(t.data(), t.size());
+    }
+
+    template <class T>
+    TString HexWriteScalar(T t) {
+        static_assert(std::is_scalar<T>::value, "scalars only");
+        t = LittleToBig(t);
+        TString res = HexEncode(&t, sizeof(t));
+        res.to_lower();
+        return res;
+    }
+
+    template <class T>
+    T HexReadScalar(TStringBuf s) {
+        static_assert(std::is_scalar<T>::value, "scalars only");
+        T t = 0;
+        HexDecode(s.data(), Min(s.size(), sizeof(T)), &t);
+        t = BigToLittle(t);
+        return t;
+    }
+
+}