From c96ea55ff1c7fadc57cf8a3d9f85ddaa5c8fe33a Mon Sep 17 00:00:00 2001
From: Nicholas Hastings <skamonkey@gmail.com>
Date: Thu, 10 Jan 2013 19:02:29 -0500
Subject: [PATCH] Added WriteVarInt32 and ByteSizeVarInt32 to tier1 bf_write.

--HG--
branch : protobuf
---
 public/tier1/bitbuf.h |  3 +++
 tier1/bitbuf.cpp      | 21 +++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/public/tier1/bitbuf.h b/public/tier1/bitbuf.h
index ad8c9dad..4cd861da 100644
--- a/public/tier1/bitbuf.h
+++ b/public/tier1/bitbuf.h
@@ -143,6 +143,9 @@ public:
 	// writes an unsigned integer with variable bit length
 	void			WriteUBitVar( unsigned int data );
 
+	void			WriteVarInt32( uint32 data );
+	int				ByteSizeVarInt32( uint32 data );
+
 	// Copy the bits straight out of pIn. This seeks pIn forward by nBits.
 	// Returns an error if this buffer or the read buffer overflows.
 	bool			WriteBitsFromBuffer( class bf_read *pIn, int nBits );
diff --git a/tier1/bitbuf.cpp b/tier1/bitbuf.cpp
index 5279692d..f59956f1 100644
--- a/tier1/bitbuf.cpp
+++ b/tier1/bitbuf.cpp
@@ -236,6 +236,27 @@ void bf_write::WriteSBitLong( int data, int numbits )
 	}
 }
 
+void bf_write::WriteVarInt32( uint32 data )
+{
+	while ( data > 0x7F ) 
+	{
+		WriteUBitLong( (data & 0x7F) | 0x80, 8 );
+		data >>= 7;
+	}
+	WriteUBitLong( data & 0x7F, 8 );
+}
+
+int	bf_write::ByteSizeVarInt32( uint32 data )
+{
+	int size = 1;
+	while ( data > 0x7F )
+	{
+		size++;
+		data >>= 7;
+	}
+	return size;
+}
+
 #if _WIN32
 inline unsigned int BitCountNeededToEncode(unsigned int data)
 {