1 files changed, 159 insertions, 0 deletions
diff --git a/common/simplebitstring.h b/common/simplebitstring.h
new file mode 100644
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--- /dev/null
+++ b/common/simplebitstring.h
@@ -0,0 +1,159 @@
+
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// The copyright to the contents herein is the property of Valve, L.L.C.
+// The contents may be used and/or copied only with the written permission of
+// Valve, L.L.C., or in accordance with the terms and conditions stipulated in
+// the agreement/contract under which the contents have been supplied.
+//
+//*****************************************************************************
+//
+// Contents:
+//
+//		CSimpleBitString
+//
+// Authors:
+//
+// Target restrictions:
+//
+// Tool restrictions:
+//
+// Things to do:
+//
+//		
+//
+//*****************************************************************************
+
+#ifndef INCLUDED_COMMON_SIMPLEBITSTRING_H
+#define INCLUDED_COMMON_SIMPLEBITSTRING_H
+
+#if defined(_MSC_VER) && (_MSC_VER > 1000)
+#pragma once
+#endif
+
+
+//*****************************************************************************
+//
+// Include files required by this header.
+//
+// Note: Do NOT place any 'using' directives or declarations in header files - 
+// put them at the top of the source files that require them.  
+// Use fully-qualified names in header files. 
+//
+//*****************************************************************************
+
+// All precompiled headers (Stable.h) include this first to give use a common 
+// place for including order-dependent library headers (things that need to go first).
+
+
+
+
+
+class CSimpleBitString
+{
+public:
+	explicit CSimpleBitString( uint32 ReserveNumBits = 0 )
+		:
+		m_uNumBits( 0 ),
+		m_vecU8()
+	{
+		m_vecU8.EnsureCapacity( (ReserveNumBits / 8) + 1 );
+		m_vecU8[ m_vecU8.AddToTail() ] = 0x00;	// always need 1 byte
+	}
+
+	void clear()
+	{
+		m_uNumBits = 0;
+		m_vecU8.RemoveAll();
+                m_vecU8[ m_vecU8.AddToTail() ] = 0x00;  // always need 1 byte
+	}
+		
+	void AppendBits( uint64 data, uint32 NumSignificantLowBitsOfData );
+	void AppendBits( const uint8 * pData, uint32 NumBitsOfData );
+
+	void ReversiblyObfusticateBitsFromStart( uint32 NumBits, const uint8 * pObfusticationData, size_t uSizeOfObfusticationData );
+	uint8	 GetByteChecksumFromStart( uint32 NumBits ) const;
+
+	uint GetCurrNumBits() const
+	{
+		return m_uNumBits;
+	}
+
+	const uint8 * data() const
+	{
+		return & m_vecU8[0];
+	}
+
+	size_t size() const
+	{
+		return m_vecU8.Count();
+	}
+
+private:
+	uint32				m_uNumBits;
+	CUtlVector<uint8>	m_vecU8;
+
+public:
+
+	// Iterator class for retrieving bits
+	class iterator
+	{
+	public:
+		explicit iterator( const CSimpleBitString & bs )
+			:
+			m_rSimpleBitString( bs ),
+			m_uNextBitIdx( 0 )
+		{
+		}
+
+		void ResetToStart()
+		{
+			m_uNextBitIdx = 0;
+		}
+
+		uint32 GetNumConsumedBits() const
+		{
+			return m_uNextBitIdx;
+		}
+
+		uint32 GetNumRemainingBits() const
+		{
+			return m_rSimpleBitString.m_uNumBits - m_uNextBitIdx;
+		}
+
+		uint32 GetNextBits( uint32 NumBitsToGet );
+		uint64 GetNextBits64( uint32 NumBitsToGet );
+
+		void SkipNextBits( uint32 NumBitsToSkip )
+		{
+			if ( m_uNextBitIdx + NumBitsToSkip > m_rSimpleBitString.m_uNumBits )
+			{
+				AssertMsg( false, "Not enough bits in CSimpleBitString" );
+				NumBitsToSkip = 0;
+			}
+
+			m_uNextBitIdx += NumBitsToSkip;
+		}
+
+		bool operator ==( const iterator & other ) const
+		{
+			return		(& m_rSimpleBitString == & other.m_rSimpleBitString)
+					&&	m_uNextBitIdx == other.m_uNextBitIdx;
+		}
+
+		void	DoAssertClassInvariant() const;
+
+	private:
+		const CSimpleBitString &	m_rSimpleBitString;	//lint !e1725 reference
+		uint32						m_uNextBitIdx;
+	};
+
+	friend class iterator;
+
+};
+
+
+
+
+
+#endif