From 6390f54f9f42d6145fa96d17b2a772c413cc11cb Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Tue, 6 Jul 2010 18:50:24 +0000
Subject: [PATCH] VarInt: added method getLengthOfVarInt().

---
 dbms/include/DB/IO/VarInt.h | 3 +++
 dbms/src/IO/VarInt.cpp      | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/dbms/include/DB/IO/VarInt.h b/dbms/include/DB/IO/VarInt.h
index 8e91925ede7..dd5590b827e 100644
--- a/dbms/include/DB/IO/VarInt.h
+++ b/dbms/include/DB/IO/VarInt.h
@@ -23,6 +23,9 @@ void readVarUInt(UInt64 & x, ReadBuffer & istr);
 /** Получить длину UInt64 в формате VarUInt */
 size_t getLengthOfVarUInt(UInt64 x);
 
+/** Получить длину Int64 в формате VarInt */
+size_t getLengthOfVarInt(Int64 x);
+
 
 /** Записать Int64 в формате переменной длины (base128) */
 template <typename OUT>
diff --git a/dbms/src/IO/VarInt.cpp b/dbms/src/IO/VarInt.cpp
index 50a1e0fa863..7350bd71bc4 100644
--- a/dbms/src/IO/VarInt.cpp
+++ b/dbms/src/IO/VarInt.cpp
@@ -287,4 +287,10 @@ size_t getLengthOfVarUInt(UInt64 x)
 }
 
 
+size_t getLengthOfVarInt(Int64 x)
+{
+	return getLengthOfVarUInt(static_cast<UInt64>((x << 1) ^ (x >> 63)));
+}
+
+
 }