1HEADmaster

8 files changed, 1891 insertions, 0 deletions

diff --git a/mdllib/mdllib.cpp b/mdllib/mdllib.cpp
new file mode 100644
index 0000000..332d2a3
--- /dev/null
+++ b/mdllib/mdllib.cpp
@@ -0,0 +1,70 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#include "mdllib_common.h"
+
+//-----------------------------------------------------------------------------
+// Global instance
+//-----------------------------------------------------------------------------
+CMdlLib mdllib;
+EXPOSE_SINGLE_INTERFACE_GLOBALVAR( CMdlLib, IMdlLib, MDLLIB_INTERFACE_VERSION, mdllib );
+
+
+
+
+//-----------------------------------------------------------------------------
+// Destructor
+//-----------------------------------------------------------------------------
+CMdlLib::~CMdlLib()
+{
+}
+
+
+//-----------------------------------------------------------------------------
+// Connect, disconnect
+//-----------------------------------------------------------------------------
+bool CMdlLib::Connect( CreateInterfaceFn factory )
+{
+// 	g_pFileSystem = (IFileSystem*)factory( FILESYSTEM_INTERFACE_VERSION, NULL );
+// 	return ( g_pFileSystem != NULL );
+	return true;
+}
+
+void CMdlLib::Disconnect()
+{
+//	g_pFileSystem = NULL;
+	return;
+}
+	
+
+//-----------------------------------------------------------------------------
+// Purpose: Startup
+//-----------------------------------------------------------------------------
+InitReturnVal_t CMdlLib::Init()
+{
+	return INIT_OK;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Cleanup
+//-----------------------------------------------------------------------------
+void CMdlLib::Shutdown()
+{
+	return;
+}
+
+//-----------------------------------------------------------------------------
+// Query interface
+//-----------------------------------------------------------------------------
+void *CMdlLib::QueryInterface( const char *pInterfaceName )
+{
+	return Sys_GetFactoryThis()( pInterfaceName, NULL );
+}
+
+
+
+
diff --git a/mdllib/mdllib.vpc b/mdllib/mdllib.vpc
new file mode 100644
index 0000000..363ad9f
--- /dev/null
+++ b/mdllib/mdllib.vpc
@@ -0,0 +1,44 @@
+//-----------------------------------------------------------------------------
+//	MDLLIB.VPC
+//
+//	Project Script
+//-----------------------------------------------------------------------------
+
+$Macro SRCDIR		".."
+$Macro OUTBINDIR	"$SRCDIR\..\game\bin"
+
+$Include "$SRCDIR\vpc_scripts\source_dll_base.vpc"
+
+$Configuration
+{
+	$Compiler
+	{
+	}
+
+	$Linker
+	{
+	}
+}
+
+$Project "mdllib"
+{
+	$Folder	"Source Files"
+	{
+		$File	"mdllib.cpp"
+		$File	"mdllib_stripinfo.cpp"
+		$File	"mdllib_stripmodel.cpp"
+		$File	"mdllib_utils.cpp"
+	}
+
+	$Folder	"Header Files"
+	{
+		$File	"$SRCDIR\public\mdllib\mdllib.h"
+		$File	"mdllib_common.h"
+		$File	"mdllib_stripinfo.h"
+		$File	"mdllib_utils.h"
+	}
+
+	$Folder "Link Libraries"
+	{
+	}
+}
diff --git a/mdllib/mdllib_common.h b/mdllib/mdllib_common.h
new file mode 100644
index 0000000..24fcd6e
--- /dev/null
+++ b/mdllib/mdllib_common.h
@@ -0,0 +1,67 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#ifndef MDLLIB_COMMON_H
+#define MDLLIB_COMMON_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "mdllib/mdllib.h"
+
+#include "platform.h"
+#pragma warning( disable : 4018 )
+#pragma warning( disable : 4389 )
+
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Interface to accessing P4 commands
+//-----------------------------------------------------------------------------
+class CMdlLib : public CBaseAppSystem< IMdlLib >
+{
+public:
+	// Destructor
+	virtual ~CMdlLib();
+
+	//////////////////////////////////////////////////////////////////////////
+	//
+	// Methods of IAppSystem
+	//
+	//////////////////////////////////////////////////////////////////////////
+public:
+	virtual bool Connect( CreateInterfaceFn factory );
+	virtual InitReturnVal_t Init();
+	virtual void *QueryInterface( const char *pInterfaceName );
+	virtual void Shutdown();
+	virtual void Disconnect();
+
+
+	//////////////////////////////////////////////////////////////////////////
+	//
+	// Methods of IMdlLib
+	//
+	//////////////////////////////////////////////////////////////////////////
+public:
+	//
+	// StripModelBuffers
+	//	The main function that strips the model buffers
+	//		mdlBuffer			- mdl buffer, updated, no size change
+	//		vvdBuffer			- vvd buffer, updated, size reduced
+	//		vtxBuffer			- vtx buffer, updated, size reduced
+	//		ppStripInfo			- if nonzero on return will be filled with the stripping info
+	//
+	virtual bool StripModelBuffers( CUtlBuffer &mdlBuffer, CUtlBuffer &vvdBuffer, CUtlBuffer &vtxBuffer, IMdlStripInfo **ppStripInfo );
+
+	//
+	// CreateNewStripInfo
+	//	Creates an empty strip info so that it can be reused.
+	//
+	virtual bool CreateNewStripInfo( IMdlStripInfo **ppStripInfo );
+};
+
+#endif // #ifndef MDLLIB_COMMON_H
diff --git a/mdllib/mdllib_stripinfo.cpp b/mdllib/mdllib_stripinfo.cpp
new file mode 100644
index 0000000..f99f889
--- /dev/null
+++ b/mdllib/mdllib_stripinfo.cpp
@@ -0,0 +1,671 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#include "mdllib_common.h"
+#include "mdllib_stripinfo.h"
+#include "mdllib_utils.h"
+
+#include "studio.h"
+#include "optimize.h"
+
+#include "materialsystem/imaterial.h"
+#include "materialsystem/hardwareverts.h"
+
+#include "smartptr.h"
+
+
+
+//////////////////////////////////////////////////////////////////////////
+//
+// CMdlStripInfo implementation
+//
+//////////////////////////////////////////////////////////////////////////
+
+
+CMdlStripInfo::CMdlStripInfo() :
+	m_eMode( MODE_UNINITIALIZED ),
+	m_lChecksumOld( 0 ),
+	m_lChecksumNew( 0 )
+{
+	NULL;
+}
+
+
+bool CMdlStripInfo::Serialize( CUtlBuffer &bufStorage ) const
+{
+	char chHeader[ 4 ] = { 'M', 'A', 'P', m_eMode };
+	bufStorage.Put( chHeader, sizeof( chHeader ) );
+
+	switch ( m_eMode )
+	{
+	default:
+	case MODE_UNINITIALIZED:
+		return true;
+	
+	case MODE_NO_CHANGE:
+		bufStorage.PutInt( m_lChecksumOld );
+		bufStorage.PutInt( m_lChecksumNew );
+		return true;
+
+	case MODE_STRIP_LOD_1N:
+		bufStorage.PutInt( m_lChecksumOld );
+		bufStorage.PutInt( m_lChecksumNew );
+
+		bufStorage.PutInt( m_vtxVerts.GetNumBits() );
+		for ( uint32 const *pdwBase = m_vtxVerts.Base(), *pdwEnd = pdwBase + m_vtxVerts.GetNumDWords();
+			pdwBase < pdwEnd; ++ pdwBase )
+			bufStorage.PutUnsignedInt( *pdwBase );
+
+		bufStorage.PutInt( m_vtxIndices.Count() );
+		for ( unsigned short const *pusBase = m_vtxIndices.Base(), *pusEnd = pusBase + m_vtxIndices.Count();
+			pusBase < pusEnd; ++ pusBase )
+			bufStorage.PutUnsignedShort( *pusBase );
+
+		bufStorage.PutInt( m_vtxMdlOffsets.Count() );
+		for ( MdlRangeItem const *pmri = m_vtxMdlOffsets.Base(), *pmriEnd = pmri + m_vtxMdlOffsets.Count();
+			pmri < pmriEnd; ++ pmri )
+			bufStorage.PutInt( pmri->m_offOld ),
+			bufStorage.PutInt( pmri->m_offNew ),
+			bufStorage.PutInt( pmri->m_numOld ),
+			bufStorage.PutInt( pmri->m_numNew );
+
+		return true;
+	}
+}
+
+bool CMdlStripInfo::UnSerialize( CUtlBuffer &bufData )
+{
+	char chHeader[ 4 ];
+	bufData.Get( chHeader, sizeof( chHeader ) );
+
+	if ( memcmp( chHeader, "MAP", 3 ) )
+		return false;
+
+	switch ( chHeader[3] )
+	{
+	default:
+		return false;
+	
+	case MODE_UNINITIALIZED:
+		m_eMode = MODE_UNINITIALIZED;
+		m_lChecksumOld = 0;
+		m_lChecksumNew = 0;
+		return true;
+
+	case MODE_NO_CHANGE:
+		m_eMode = MODE_NO_CHANGE;
+		m_lChecksumOld = bufData.GetInt();
+		m_lChecksumNew = bufData.GetInt();
+		return true;
+
+	case MODE_STRIP_LOD_1N:
+		m_eMode = MODE_STRIP_LOD_1N;
+		m_lChecksumOld = bufData.GetInt();
+		m_lChecksumNew = bufData.GetInt();
+
+		m_vtxVerts.Resize( bufData.GetInt(), true );
+		for ( uint32 *pdwBase = m_vtxVerts.Base(), *pdwEnd = pdwBase + m_vtxVerts.GetNumDWords();
+			pdwBase < pdwEnd; ++ pdwBase )
+			*pdwBase = bufData.GetUnsignedInt();
+
+		m_vtxIndices.SetCount( bufData.GetInt() );
+		for ( unsigned short *pusBase = m_vtxIndices.Base(), *pusEnd = pusBase + m_vtxIndices.Count();
+			pusBase < pusEnd; ++ pusBase )
+			*pusBase = bufData.GetUnsignedShort();
+
+		m_vtxMdlOffsets.SetCount( bufData.GetInt() );
+		for ( MdlRangeItem *pmri = m_vtxMdlOffsets.Base(), *pmriEnd = pmri + m_vtxMdlOffsets.Count();
+			pmri < pmriEnd; ++ pmri )
+			pmri->m_offOld = bufData.GetInt(),
+			pmri->m_offNew = bufData.GetInt(),
+			pmri->m_numOld = bufData.GetInt(),
+			pmri->m_numNew = bufData.GetInt();
+
+		return true;
+	}
+}
+
+
+// Returns the checksums that the stripping info was generated for:
+//	plChecksumOriginal		if non-NULL will hold the checksum of the original model submitted for stripping
+//	plChecksumStripped		if non-NULL will hold the resulting checksum of the stripped model
+bool CMdlStripInfo::GetCheckSum( long *plChecksumOriginal, long *plChecksumStripped ) const
+{
+	if ( m_eMode == MODE_UNINITIALIZED )
+		return false;
+
+	if ( plChecksumOriginal )
+		*plChecksumOriginal = m_lChecksumOld;
+
+	if ( plChecksumStripped )
+		*plChecksumStripped = m_lChecksumNew;
+
+	return true;
+}
+
+
+//
+// StripHardwareVertsBuffer
+//	The main function that strips the vhv buffer
+//		vhvBuffer		- vhv buffer, updated, size reduced
+//
+bool CMdlStripInfo::StripHardwareVertsBuffer( CUtlBuffer &vhvBuffer )
+{
+	if ( m_eMode == MODE_UNINITIALIZED )
+		return false;
+
+	//
+	// Recover vhv header
+	//
+	DECLARE_PTR( HardwareVerts::FileHeader_t, vhvHdr, BYTE_OFF_PTR( vhvBuffer.Base(), vhvBuffer.TellGet() ) );
+	int vhvLength = vhvBuffer.TellPut() - vhvBuffer.TellGet();
+
+	if ( vhvHdr->m_nChecksum != m_lChecksumOld )
+	{
+		DLog( "mdllib", 1, "ERROR: [StripHardwareVertsBuffer] checksum mismatch!\n" );
+		return false;
+	}
+
+	vhvHdr->m_nChecksum = m_lChecksumNew;
+
+
+	// No remapping required
+	if ( m_eMode == MODE_NO_CHANGE )
+		return true;
+
+
+	Assert( m_eMode == MODE_STRIP_LOD_1N );
+
+	//
+	// Now reconstruct the vhv structures to do the mapping
+	//
+
+	CRemoveTracker vhvRemove;
+	size_t vhvVertOffset = ~size_t( 0 ), vhvEndMeshOffset = sizeof( HardwareVerts::FileHeader_t );
+	int numMeshesRemoved = 0, numVertsRemoved = 0;
+
+	ITERATE_CHILDREN( HardwareVerts::MeshHeader_t, vhvMesh, vhvHdr, pMesh, m_nMeshes )
+		if ( vhvMesh->m_nOffset < vhvVertOffset )
+			vhvVertOffset = vhvMesh->m_nOffset;
+		if ( BYTE_DIFF_PTR( vhvHdr, vhvMesh + 1 ) > vhvEndMeshOffset )
+			vhvEndMeshOffset = BYTE_DIFF_PTR( vhvHdr, vhvMesh + 1 );
+		if ( !vhvMesh->m_nLod )
+			continue;
+		vhvRemove.RemoveBytes( BYTE_OFF_PTR( vhvHdr, vhvMesh->m_nOffset ), vhvMesh->m_nVertexes * vhvHdr->m_nVertexSize );
+		vhvRemove.RemoveElements( vhvMesh );
+		numVertsRemoved += vhvMesh->m_nVertexes;
+		++ numMeshesRemoved;
+	ITERATE_END
+	vhvRemove.RemoveBytes( BYTE_OFF_PTR( vhvHdr, vhvEndMeshOffset ), vhvVertOffset - vhvEndMeshOffset );	// Padding
+	vhvRemove.RemoveBytes( BYTE_OFF_PTR( vhvHdr, vhvVertOffset + vhvHdr->m_nVertexes * vhvHdr->m_nVertexSize ), vhvLength - ( vhvVertOffset + vhvHdr->m_nVertexes * vhvHdr->m_nVertexSize ) );
+
+	vhvRemove.Finalize();
+	DLog( "mdllib", 3, " Stripped %d vhv bytes.\n", vhvRemove.GetNumBytesRemoved() );
+
+	// Verts must be aligned from hdr, length must be aligned from hdr
+	size_t vhvNewVertOffset = vhvRemove.ComputeOffset( vhvHdr, vhvVertOffset );
+	size_t vhvAlignedVertOffset = ALIGN_VALUE( vhvNewVertOffset, 4 );
+
+	ITERATE_CHILDREN( HardwareVerts::MeshHeader_t, vhvMesh, vhvHdr, pMesh, m_nMeshes )
+		vhvMesh->m_nOffset = vhvRemove.ComputeOffset( vhvHdr, vhvMesh->m_nOffset ) + vhvAlignedVertOffset - vhvNewVertOffset;
+	ITERATE_END
+	vhvHdr->m_nMeshes -= numMeshesRemoved;
+	vhvHdr->m_nVertexes -= numVertsRemoved;
+
+	// Remove the memory
+	vhvRemove.MemMove( vhvHdr, vhvLength );	// All padding has been removed
+
+	size_t numBytesNewLength = vhvLength + vhvAlignedVertOffset - vhvNewVertOffset;
+	size_t numAlignedNewLength = ALIGN_VALUE( numBytesNewLength, 4 );
+
+	// Now reinsert the padding
+	CInsertionTracker vhvInsertPadding;
+	vhvInsertPadding.InsertBytes( BYTE_OFF_PTR( vhvHdr, vhvNewVertOffset ), vhvAlignedVertOffset - vhvNewVertOffset );
+	vhvInsertPadding.InsertBytes( BYTE_OFF_PTR( vhvHdr, vhvLength ), numAlignedNewLength - numBytesNewLength );
+	
+	vhvInsertPadding.Finalize();
+	DLog( "mdllib", 3, " Inserted %d alignment bytes.\n", vhvInsertPadding.GetNumBytesInserted() );
+
+	vhvInsertPadding.MemMove( vhvHdr, vhvLength );
+
+
+	// Update the buffer length
+	vhvBuffer.SeekPut( CUtlBuffer::SEEK_CURRENT, vhvBuffer.TellGet() + vhvLength - vhvBuffer.TellPut() );
+
+	DLog( "mdllib", 2, " Reduced vhv buffer by %d bytes.\n", vhvRemove.GetNumBytesRemoved() - vhvInsertPadding.GetNumBytesInserted() );
+
+	// Done
+	return true;
+}
+
+//
+// StripModelBuffer
+//	The main function that strips the mdl buffer
+//		mdlBuffer		- mdl buffer, updated
+//
+bool CMdlStripInfo::StripModelBuffer( CUtlBuffer &mdlBuffer )
+{
+	if ( m_eMode == MODE_UNINITIALIZED )
+		return false;
+
+	//
+	// Recover mdl header
+	//
+	DECLARE_PTR( studiohdr_t, mdlHdr, BYTE_OFF_PTR( mdlBuffer.Base(), mdlBuffer.TellGet() ) );
+
+	if ( mdlHdr->checksum != m_lChecksumOld )
+	{
+		DLog( "mdllib", 1, "ERROR: [StripModelBuffer] checksum mismatch!\n" );
+		return false;
+	}
+
+	mdlHdr->checksum = m_lChecksumNew;
+
+
+	// No remapping required
+	if ( m_eMode == MODE_NO_CHANGE )
+		return true;
+
+
+	Assert( m_eMode == MODE_STRIP_LOD_1N );
+
+
+	//
+	// Do the model buffer stripping
+	//
+
+	CUtlSortVector< unsigned short, CLessSimple< unsigned short > > &srcIndices = m_vtxIndices;
+
+	ITERATE_CHILDREN( mstudiobodyparts_t, mdlBodyPart, mdlHdr, pBodypart, numbodyparts )
+		ITERATE_CHILDREN( mstudiomodel_t, mdlModel, mdlBodyPart, pModel, nummodels )
+			
+			DLog( "mdllib", 3, " Stripped %d vertexes (was: %d, now: %d).\n", mdlModel->numvertices - srcIndices.Count(), mdlModel->numvertices, srcIndices.Count() );
+
+			mdlModel->numvertices = srcIndices.Count();
+
+			ITERATE_CHILDREN( mstudiomesh_t, mdlMesh, mdlModel, pMesh, nummeshes )
+				
+				mdlMesh->numvertices = srcIndices.FindLess( mdlMesh->vertexoffset + mdlMesh->numvertices );
+				mdlMesh->vertexoffset = srcIndices.FindLess( mdlMesh->vertexoffset ) + 1;
+				mdlMesh->numvertices -= mdlMesh->vertexoffset - 1;
+
+				// Truncate the number of vertexes
+				for ( int k = 0; k < ARRAYSIZE( mdlMesh->vertexdata.numLODVertexes ); ++ k )
+					mdlMesh->vertexdata.numLODVertexes[ k ] = mdlMesh->numvertices;
+
+			ITERATE_END
+		ITERATE_END
+	ITERATE_END
+
+	//
+	// Update bones not to mention anything below LOD0
+	//
+	ITERATE_CHILDREN( mstudiobone_t, mdlBone, mdlHdr, pBone, numbones )
+		mdlBone->flags &= ( BONE_USED_BY_VERTEX_LOD0 | ~BONE_USED_BY_VERTEX_MASK );
+	ITERATE_END
+
+	DLog( "mdllib", 3, " Updated %d bone(s).\n", mdlHdr->numbones );
+
+	return true;
+}
+
+
+//
+// StripVertexDataBuffer
+//	The main function that strips the vvd buffer
+//		vvdBuffer		- vvd buffer, updated, size reduced
+//
+bool CMdlStripInfo::StripVertexDataBuffer( CUtlBuffer &vvdBuffer )
+{
+	if ( m_eMode == MODE_UNINITIALIZED )
+		return false;
+
+	//
+	// Recover vvd header
+	//
+	DECLARE_PTR( vertexFileHeader_t, vvdHdr, BYTE_OFF_PTR( vvdBuffer.Base(), vvdBuffer.TellGet() ) );
+	int vvdLength = vvdBuffer.TellPut() - vvdBuffer.TellGet();
+
+	if ( vvdHdr->checksum != m_lChecksumOld )
+	{
+		DLog( "mdllib", 1, "ERROR: [StripVertexDataBuffer] checksum mismatch!\n" );
+		return false;
+	}
+
+	vvdHdr->checksum = m_lChecksumNew;
+
+
+	// No remapping required
+	if ( m_eMode == MODE_NO_CHANGE )
+		return true;
+
+
+	Assert( m_eMode == MODE_STRIP_LOD_1N );
+
+
+	//
+	// Do the vertex data buffer stripping
+	//
+
+	CUtlSortVector< unsigned short, CLessSimple< unsigned short > > &srcIndices = m_vtxIndices;
+	int mdlNumVerticesOld = vvdHdr->numLODVertexes[ 0 ];
+
+	vvdHdr->numLODs = 1;
+	for ( int k = 0; k < ARRAYSIZE( vvdHdr->numLODVertexes ); ++ k )
+		vvdHdr->numLODVertexes[ k ] = srcIndices.Count();
+
+	DECLARE_PTR( mstudiovertex_t, vvdVertexSrc, BYTE_OFF_PTR( vvdHdr, vvdHdr->vertexDataStart ) );
+	DECLARE_PTR( Vector4D, vvdTangentSrc, vvdHdr->tangentDataStart ? BYTE_OFF_PTR( vvdHdr, vvdHdr->tangentDataStart ) : NULL );
+	
+	// Apply the fixups first of all
+	if ( vvdHdr->numFixups )
+	{
+		CArrayAutoPtr< byte > memTempVVD( new byte[ vvdLength ] );
+		DECLARE_PTR( mstudiovertex_t, vvdVertexNew, BYTE_OFF_PTR( memTempVVD.Get(), vvdHdr->vertexDataStart ) );
+		DECLARE_PTR( Vector4D, vvdTangentNew, BYTE_OFF_PTR( memTempVVD.Get(), vvdHdr->tangentDataStart ) );
+		DECLARE_PTR( vertexFileFixup_t, vvdFixup, BYTE_OFF_PTR( vvdHdr, vvdHdr->fixupTableStart ) );
+		for ( int k = 0; k < vvdHdr->numFixups; ++ k )
+		{
+			memcpy( vvdVertexNew, vvdVertexSrc + vvdFixup[ k ].sourceVertexID, vvdFixup[ k ].numVertexes * sizeof( *vvdVertexNew ) );
+			vvdVertexNew += vvdFixup[ k ].numVertexes;
+			if ( vvdTangentSrc )
+			{
+				memcpy( vvdTangentNew, vvdTangentSrc + vvdFixup[ k ].sourceVertexID, vvdFixup[ k ].numVertexes * sizeof( *vvdTangentNew ) );
+				vvdTangentNew += vvdFixup[ k ].numVertexes;
+			}
+		}
+
+		// Move back the memory after fixups were applied
+		vvdVertexSrc  ? memcpy( vvdVertexSrc, BYTE_OFF_PTR( memTempVVD.Get(), vvdHdr->vertexDataStart ), mdlNumVerticesOld * sizeof( *vvdVertexSrc ) ) : 0;
+		vvdTangentSrc ? memcpy( vvdTangentSrc, BYTE_OFF_PTR( memTempVVD.Get(), vvdHdr->tangentDataStart ), mdlNumVerticesOld * sizeof( *vvdTangentSrc ) ) : 0;
+	}
+	
+	vvdHdr->vertexDataStart -= ALIGN_VALUE( sizeof( vertexFileFixup_t ) * vvdHdr->numFixups, 16 );
+	vvdHdr->numFixups = 0;
+	DECLARE_PTR( mstudiovertex_t, vvdVertexNew, BYTE_OFF_PTR( vvdHdr, vvdHdr->vertexDataStart ) );
+	for ( int k = 0; k < srcIndices.Count(); ++ k )
+		vvdVertexNew[ k ] = vvdVertexSrc[ srcIndices[ k ] ];
+
+	size_t newVertexDataSize = srcIndices.Count() * sizeof( mstudiovertex_t );
+	int vvdLengthOld = vvdLength;
+	vvdLength = vvdHdr->vertexDataStart + newVertexDataSize;
+
+	if ( vvdTangentSrc )
+	{
+		// Move the tangents
+		vvdHdr->tangentDataStart = vvdLength;
+		DECLARE_PTR( Vector4D, vvdTangentNew, BYTE_OFF_PTR( vvdHdr, vvdHdr->tangentDataStart ) );
+
+		for ( int k = 0; k < srcIndices.Count(); ++ k )
+			vvdTangentNew[ k ] = vvdTangentSrc[ srcIndices[ k ] ];
+
+		vvdLength += srcIndices.Count() * sizeof( Vector4D );
+	}
+	
+	vvdBuffer.SeekPut( CUtlBuffer::SEEK_CURRENT, vvdBuffer.TellGet() + vvdLength - vvdBuffer.TellPut() );
+
+	DLog( "mdllib", 3, " Stripped %d vvd bytes.\n", vvdLengthOld - vvdLength );
+
+	return true;
+}
+
+//
+// StripOptimizedModelBuffer
+//	The main function that strips the vtx buffer
+//		vtxBuffer		- vtx buffer, updated, size reduced
+//
+bool CMdlStripInfo::StripOptimizedModelBuffer( CUtlBuffer &vtxBuffer )
+{
+	if ( m_eMode == MODE_UNINITIALIZED )
+		return false;
+
+	//
+	// Recover vtx header
+	//
+	DECLARE_PTR( OptimizedModel::FileHeader_t, vtxHdr, BYTE_OFF_PTR( vtxBuffer.Base(), vtxBuffer.TellGet() ) );
+	int vtxLength = vtxBuffer.TellPut() - vtxBuffer.TellGet();
+
+	if ( vtxHdr->checkSum != m_lChecksumOld )
+	{
+		DLog( "mdllib", 1, "ERROR: [StripOptimizedModelBuffer] checksum mismatch!\n" );
+		return false;
+	}
+
+	vtxHdr->checkSum = m_lChecksumNew;
+
+	// No remapping required
+	if ( m_eMode == MODE_NO_CHANGE )
+		return true;
+
+	Assert( m_eMode == MODE_STRIP_LOD_1N );
+
+
+	//
+	// Do the optimized model buffer stripping
+	//
+
+	CUtlSortVector< unsigned short, CLessSimple< unsigned short > > &srcIndices = m_vtxIndices;
+	CUtlSortVector< CMdlStripInfo::MdlRangeItem, CLessSimple< CMdlStripInfo::MdlRangeItem > > &arrMdlOffsets = m_vtxMdlOffsets;
+
+	size_t vtxOffIndexBuffer = ~size_t(0), vtxOffIndexBufferEnd = 0;
+	size_t vtxOffVertexBuffer = ~size_t(0), vtxOffVertexBufferEnd = 0;
+	CRemoveTracker vtxRemove;
+	CUtlVector< size_t > vtxOffIndex;
+	CUtlVector< size_t > vtxOffVertex;
+
+	vtxRemove.RemoveElements( CHILD_AT( vtxHdr, pMaterialReplacementList, 1 ), vtxHdr->numLODs - 1 );
+	ITERATE_CHILDREN( OptimizedModel::MaterialReplacementListHeader_t, vtxMatList, vtxHdr, pMaterialReplacementList, numLODs )
+		if ( !vtxMatList_idx ) continue;
+		vtxRemove.RemoveElements( CHILD_AT( vtxMatList, pMaterialReplacement, 0 ), vtxMatList->numReplacements );
+		ITERATE_CHILDREN( OptimizedModel::MaterialReplacementHeader_t, vtxMat, vtxMatList, pMaterialReplacement, numReplacements )
+			char const *szName = vtxMat->pMaterialReplacementName();
+			vtxRemove.RemoveElements( szName, szName ? strlen( szName ) + 1 : 0 );
+		ITERATE_END
+	ITERATE_END
+
+	ITERATE_CHILDREN( OptimizedModel::BodyPartHeader_t, vtxBodyPart, vtxHdr, pBodyPart, numBodyParts )
+		ITERATE_CHILDREN( OptimizedModel::ModelHeader_t, vtxModel, vtxBodyPart, pModel, numModels )
+		
+			vtxRemove.RemoveElements( CHILD_AT( vtxModel, pLOD, 1 ), vtxModel->numLODs - 1 );
+			ITERATE_CHILDREN( OptimizedModel::ModelLODHeader_t, vtxLod, vtxModel, pLOD, numLODs )
+				if ( !vtxLod_idx )	// Process only lod1-N
+					continue;
+				
+				vtxRemove.RemoveElements( CHILD_AT( vtxLod, pMesh, 0 ), vtxLod->numMeshes );
+				ITERATE_CHILDREN( OptimizedModel::MeshHeader_t, vtxMesh, vtxLod, pMesh, numMeshes )
+					vtxRemove.RemoveElements( CHILD_AT( vtxMesh, pStripGroup, 0 ), vtxMesh->numStripGroups );
+					ITERATE_CHILDREN( OptimizedModel::StripGroupHeader_t, vtxStripGroup, vtxMesh, pStripGroup, numStripGroups )
+						vtxRemove.RemoveElements( CHILD_AT( vtxStripGroup, pStrip, 0 ), vtxStripGroup->numStrips );
+						ITERATE_CHILDREN( OptimizedModel::StripHeader_t, vtxStrip, vtxStripGroup, pStrip, numStrips )
+							vtxRemove.RemoveElements( CHILD_AT( vtxStrip, pBoneStateChange, 0 ), vtxStrip->numBoneStateChanges );
+						ITERATE_END
+					ITERATE_END
+				ITERATE_END
+
+			ITERATE_END
+
+			// Use all lods to determine the ranges of vertex and index buffers.
+			// We rely on the fact that vertex and index buffers are laid out as one solid memory block for all lods.
+			ITERATE_CHILDREN( OptimizedModel::ModelLODHeader_t, vtxLod, vtxModel, pLOD, numLODs )
+				ITERATE_CHILDREN( OptimizedModel::MeshHeader_t, vtxMesh, vtxLod, pMesh, numMeshes )
+					ITERATE_CHILDREN( OptimizedModel::StripGroupHeader_t, vtxStripGroup, vtxMesh, pStripGroup, numStripGroups )
+
+						size_t offIndex = BYTE_DIFF_PTR( vtxHdr, CHILD_AT( vtxStripGroup, pIndex, 0 ) );
+						size_t offIndexEnd = BYTE_DIFF_PTR( vtxHdr, CHILD_AT( vtxStripGroup, pIndex, vtxStripGroup->numIndices ) );
+						size_t offVertex = BYTE_DIFF_PTR( vtxHdr, CHILD_AT( vtxStripGroup, pVertex, 0 ) );
+						size_t offVertexEnd = BYTE_DIFF_PTR( vtxHdr, CHILD_AT( vtxStripGroup, pVertex, vtxStripGroup->numVerts ) );
+
+						if ( offIndex < vtxOffIndexBuffer )
+							vtxOffIndexBuffer = offIndex;
+						if ( offIndexEnd > vtxOffIndexBufferEnd )
+							vtxOffIndexBufferEnd = offIndexEnd;
+						if ( offVertex < vtxOffVertexBuffer )
+							vtxOffVertexBuffer = offVertex;
+						if ( offVertexEnd > vtxOffVertexBufferEnd )
+							vtxOffVertexBufferEnd = offVertexEnd;
+
+						if ( !vtxLod_idx )
+						{
+							vtxOffIndex.AddToTail( offIndex );
+							vtxOffIndex.AddToTail( offIndexEnd );
+							vtxOffVertex.AddToTail( offVertex );
+							vtxOffVertex.AddToTail( offVertexEnd );
+						}
+
+					ITERATE_END
+				ITERATE_END
+			ITERATE_END
+
+		ITERATE_END
+	ITERATE_END
+
+	// Fixup the vertex buffer
+	DECLARE_PTR( OptimizedModel::Vertex_t, vtxVertexBuffer, BYTE_OFF_PTR( vtxHdr, vtxOffVertexBuffer ) );
+	DECLARE_PTR( OptimizedModel::Vertex_t, vtxVertexBufferEnd, BYTE_OFF_PTR( vtxHdr, vtxOffVertexBufferEnd ) );
+	CUtlVector< int > vtxIndexDeltas;
+	vtxIndexDeltas.EnsureCapacity( vtxVertexBufferEnd - vtxVertexBuffer );
+	int vtxNumVertexRemoved = 0;
+	for ( OptimizedModel::Vertex_t *vtxVertexElement = vtxVertexBuffer; vtxVertexElement < vtxVertexBufferEnd; ++ vtxVertexElement )
+	{
+		size_t const off = BYTE_DIFF_PTR( vtxHdr, vtxVertexElement );
+		bool bUsed = false;
+		for ( int k = 0; k < vtxOffVertex.Count(); k += 2 )
+		{
+			if ( off >= vtxOffVertex[ k ] && off < vtxOffVertex[ k + 1 ] )
+			{
+				bUsed = true;
+				break;
+			}
+		}
+		if ( !bUsed )
+		{
+			// Index is not in use
+			vtxRemove.RemoveElements( vtxVertexElement );
+			vtxIndexDeltas.AddToTail( 0 );
+			vtxNumVertexRemoved ++;
+		}
+		else
+		{	// Index is in use and must be remapped
+			// Find the mesh where this index belongs
+			int iMesh = arrMdlOffsets.FindLessOrEqual( MdlRangeItem( 0, 0, vtxVertexElement - vtxVertexBuffer ) );
+			Assert( iMesh >= 0 && iMesh < arrMdlOffsets.Count() );
+			
+			MdlRangeItem &mri = arrMdlOffsets[ iMesh ];
+			Assert( ( vtxVertexElement - vtxVertexBuffer >= mri.m_offNew ) && ( vtxVertexElement - vtxVertexBuffer < mri.m_offNew + mri.m_numNew ) );
+			
+			Assert( m_vtxVerts.IsBitSet( vtxVertexElement->origMeshVertID + mri.m_offOld ) );
+			vtxVertexElement->origMeshVertID = srcIndices.Find( vtxVertexElement->origMeshVertID + mri.m_offOld ) - mri.m_offNew;
+			Assert( vtxVertexElement->origMeshVertID < mri.m_numNew );
+			vtxIndexDeltas.AddToTail( vtxNumVertexRemoved );
+		}
+	}
+
+	// Fixup the index buffer
+	DECLARE_PTR( unsigned short, vtxIndexBuffer, BYTE_OFF_PTR( vtxHdr, vtxOffIndexBuffer ) );
+	DECLARE_PTR( unsigned short, vtxIndexBufferEnd, BYTE_OFF_PTR( vtxHdr, vtxOffIndexBufferEnd ) );
+	for ( unsigned short *vtxIndexElement = vtxIndexBuffer; vtxIndexElement < vtxIndexBufferEnd; ++ vtxIndexElement )
+	{
+		size_t const off = BYTE_DIFF_PTR( vtxHdr, vtxIndexElement );
+		bool bUsed = false;
+		for ( int k = 0; k < vtxOffIndex.Count(); k += 2 )
+		{
+			if ( off >= vtxOffIndex[ k ] && off < vtxOffIndex[ k + 1 ] )
+			{
+				bUsed = true;
+				break;
+			}
+		}
+		if ( !bUsed )
+		{
+			// Index is not in use
+			vtxRemove.RemoveElements( vtxIndexElement );
+		}
+		else
+		{
+			// Index is in use and must be remapped
+			*vtxIndexElement -= vtxIndexDeltas[ *vtxIndexElement ];
+		}
+	}
+
+	// By now should have scheduled all removal information
+	vtxRemove.Finalize();
+	DLog( "mdllib", 3, " Stripped %d vtx bytes.\n", vtxRemove.GetNumBytesRemoved() );
+
+	//
+	// Fixup all the offsets
+	//
+	ITERATE_CHILDREN( OptimizedModel::MaterialReplacementListHeader_t, vtxMatList, vtxHdr, pMaterialReplacementList, numLODs )
+		ITERATE_CHILDREN( OptimizedModel::MaterialReplacementHeader_t, vtxMat, vtxMatList, pMaterialReplacement, numReplacements )
+			vtxMat->replacementMaterialNameOffset = vtxRemove.ComputeOffset( vtxMat, vtxMat->replacementMaterialNameOffset );
+		ITERATE_END
+		vtxMatList->replacementOffset = vtxRemove.ComputeOffset( vtxMatList, vtxMatList->replacementOffset );
+	ITERATE_END
+	ITERATE_CHILDREN( OptimizedModel::BodyPartHeader_t, vtxBodyPart, vtxHdr, pBodyPart, numBodyParts )
+		ITERATE_CHILDREN( OptimizedModel::ModelHeader_t, vtxModel, vtxBodyPart, pModel, numModels )
+			ITERATE_CHILDREN( OptimizedModel::ModelLODHeader_t, vtxLod, vtxModel, pLOD, numLODs )
+				ITERATE_CHILDREN( OptimizedModel::MeshHeader_t, vtxMesh, vtxLod, pMesh, numMeshes )
+					ITERATE_CHILDREN( OptimizedModel::StripGroupHeader_t, vtxStripGroup, vtxMesh, pStripGroup, numStripGroups )
+						
+						ITERATE_CHILDREN( OptimizedModel::StripHeader_t, vtxStrip, vtxStripGroup, pStrip, numStrips )
+							vtxStrip->indexOffset =
+								vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->indexOffset + vtxStrip->indexOffset ) -
+								vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->indexOffset );
+							vtxStrip->vertOffset =
+								vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->vertOffset + vtxStrip->vertOffset ) -
+								vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->vertOffset );
+							vtxStrip->boneStateChangeOffset = vtxRemove.ComputeOffset( vtxStrip, vtxStrip->boneStateChangeOffset );
+						ITERATE_END
+
+						vtxStripGroup->vertOffset = vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->vertOffset );
+						vtxStripGroup->indexOffset = vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->indexOffset );
+						vtxStripGroup->stripOffset = vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->stripOffset );
+					ITERATE_END
+					vtxMesh->stripGroupHeaderOffset = vtxRemove.ComputeOffset( vtxMesh, vtxMesh->stripGroupHeaderOffset );
+				ITERATE_END
+				vtxLod->meshOffset = vtxRemove.ComputeOffset( vtxLod, vtxLod->meshOffset );
+			ITERATE_END
+			vtxModel->lodOffset = vtxRemove.ComputeOffset( vtxModel, vtxModel->lodOffset );
+			vtxModel->numLODs = 1;
+		ITERATE_END
+		vtxBodyPart->modelOffset = vtxRemove.ComputeOffset( vtxBodyPart, vtxBodyPart->modelOffset );
+	ITERATE_END
+	vtxHdr->materialReplacementListOffset = vtxRemove.ComputeOffset( vtxHdr, vtxHdr->materialReplacementListOffset );
+	vtxHdr->bodyPartOffset = vtxRemove.ComputeOffset( vtxHdr, vtxHdr->bodyPartOffset );
+	vtxHdr->numLODs = 1;
+
+	// Perform final memory move
+	vtxRemove.MemMove( vtxHdr, vtxLength );
+
+	vtxBuffer.SeekPut( CUtlBuffer::SEEK_CURRENT, vtxBuffer.TellGet() + vtxLength - vtxBuffer.TellPut() );
+
+	return true;
+}
+
+
+
+
+
+//////////////////////////////////////////////////////////////////////////
+//
+// Auxilliary methods
+//
+//////////////////////////////////////////////////////////////////////////
+
+void CMdlStripInfo::DeleteThis()
+{
+	delete this;
+}
+
+void CMdlStripInfo::Reset()
+{
+	m_eMode = MODE_UNINITIALIZED;
+	m_lChecksumOld = 0;
+	m_lChecksumNew = 0;
+
+	m_vtxVerts.Resize( 0 );
+	m_vtxIndices.RemoveAll();
+}
+
diff --git a/mdllib/mdllib_stripinfo.h b/mdllib/mdllib_stripinfo.h
new file mode 100644
index 0000000..e04d98c
--- /dev/null
+++ b/mdllib/mdllib_stripinfo.h
@@ -0,0 +1,127 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================//
+
+#ifndef MDLLIB_STRIPINFO_H
+#define MDLLIB_STRIPINFO_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "mdllib/mdllib.h"
+#include "mdllib_utils.h"
+#include "UtlSortVector.h"
+
+
+//
+// CMdlStripInfo
+//	Implementation of IMdlStripInfo interface
+//
+class CMdlStripInfo : public IMdlStripInfo
+{
+public:
+	CMdlStripInfo();
+
+	//
+	// Serialization
+	//
+public:
+	// Save the strip info to the buffer (appends to the end)
+	virtual bool Serialize( CUtlBuffer &bufStorage ) const;
+
+	// Load the strip info from the buffer (reads from the current position as much as needed)
+	virtual bool UnSerialize( CUtlBuffer &bufData );
+
+	//
+	// Stripping info state
+	//
+public:
+	// Returns the checksums that the stripping info was generated for:
+	//	plChecksumOriginal		if non-NULL will hold the checksum of the original model submitted for stripping
+	//	plChecksumStripped		if non-NULL will hold the resulting checksum of the stripped model
+	virtual bool GetCheckSum( long *plChecksumOriginal, long *plChecksumStripped ) const;
+
+	//
+	// Stripping
+	//
+public:
+
+	//
+	// StripHardwareVertsBuffer
+	//	The main function that strips the vhv buffer
+	//		vhvBuffer		- vhv buffer, updated, size reduced
+	//
+	virtual bool StripHardwareVertsBuffer( CUtlBuffer &vhvBuffer );
+
+	//
+	// StripModelBuffer
+	//	The main function that strips the mdl buffer
+	//		mdlBuffer		- mdl buffer, updated
+	//
+	virtual bool StripModelBuffer( CUtlBuffer &mdlBuffer );
+
+	//
+	// StripVertexDataBuffer
+	//	The main function that strips the vvd buffer
+	//		vvdBuffer		- vvd buffer, updated, size reduced
+	//
+	virtual bool StripVertexDataBuffer( CUtlBuffer &vvdBuffer );
+
+	//
+	// StripOptimizedModelBuffer
+	//	The main function that strips the vtx buffer
+	//		vtxBuffer		- vtx buffer, updated, size reduced
+	//
+	virtual bool StripOptimizedModelBuffer( CUtlBuffer &vtxBuffer );
+
+	//
+	// Release the object with "delete this"
+	//
+public:
+	virtual void DeleteThis();
+
+
+
+public:
+	void Reset();
+
+
+public:
+	enum Mode
+	{
+		MODE_UNINITIALIZED	= 0,
+		MODE_NO_CHANGE		= 1,
+		MODE_STRIP_LOD_1N	= 2,
+	};
+
+	//
+	// Internal data used for stripping
+	//
+public:
+	int m_eMode;
+	long m_lChecksumOld, m_lChecksumNew;
+	CGrowableBitVec m_vtxVerts;
+	CUtlSortVector< unsigned short, CLessSimple< unsigned short > > m_vtxIndices;
+
+	//
+	// Mesh ranges fixup
+	//
+public:
+	struct MdlRangeItem
+	{
+		/* implicit */ MdlRangeItem( int offOld = 0, int numOld = 0, int offNew = 0, int numNew = 0 ) :
+			m_offOld( offOld ), m_offNew( offNew ), m_numOld( numOld ), m_numNew( numNew ) {}
+
+		int m_offOld, m_offNew;
+		int m_numOld, m_numNew;
+
+		bool operator < ( MdlRangeItem const &x ) const { return m_offNew < x.m_offNew; }
+	};
+	CUtlSortVector< CMdlStripInfo::MdlRangeItem, CLessSimple< CMdlStripInfo::MdlRangeItem > > m_vtxMdlOffsets;
+
+};
+
+
+#endif // #ifndef MDLLIB_STRIPINFO_H
diff --git a/mdllib/mdllib_stripmodel.cpp b/mdllib/mdllib_stripmodel.cpp
new file mode 100644
index 0000000..e05d8cd
--- /dev/null
+++ b/mdllib/mdllib_stripmodel.cpp
@@ -0,0 +1,504 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#include "mdllib_common.h"
+#include "mdllib_stripinfo.h"
+#include "mdllib_utils.h"
+
+#include "studio.h"
+#include "optimize.h"
+
+#include "smartptr.h"
+
+
+bool CMdlLib::CreateNewStripInfo( IMdlStripInfo **ppStripInfo )
+{
+	if ( !ppStripInfo )
+		return false;
+
+	if ( *ppStripInfo )
+	{
+		CMdlStripInfo *pMdlStripInfo = ( CMdlStripInfo * ) ( *ppStripInfo );
+		pMdlStripInfo->Reset();
+		return true;
+	}
+
+	*ppStripInfo = new CMdlStripInfo;
+	return ( NULL != *ppStripInfo );
+}
+
+//
+// StripModelBuffers
+//	The main function that strips the model buffers
+//		mdlBuffer			- mdl buffer, updated, no size change
+//		vvdBuffer			- vvd buffer, updated, size reduced
+//		vtxBuffer			- vtx buffer, updated, size reduced
+//		ppStripInfo			- if nonzero on return will be filled with the stripping info
+//
+bool CMdlLib::StripModelBuffers( CUtlBuffer &mdlBuffer, CUtlBuffer &vvdBuffer, CUtlBuffer &vtxBuffer, IMdlStripInfo **ppStripInfo )
+{
+	DECLARE_PTR( byte, mdl, BYTE_OFF_PTR( mdlBuffer.Base(), mdlBuffer.TellGet() ) );
+	DECLARE_PTR( byte, vvd, BYTE_OFF_PTR( vvdBuffer.Base(), vvdBuffer.TellGet() ) );
+	DECLARE_PTR( byte, vtx, BYTE_OFF_PTR( vtxBuffer.Base(), vtxBuffer.TellGet() ) );
+
+	int vvdLength = vvdBuffer.TellPut() - vvdBuffer.TellGet();
+	int vtxLength = vtxBuffer.TellPut() - vtxBuffer.TellGet();
+
+	//
+	// ===================
+	// =================== Modify the checksum and check if further processing is needed
+	// ===================
+	//
+
+	DECLARE_PTR( studiohdr_t, mdlHdr, mdl );
+	DECLARE_PTR( vertexFileHeader_t, vvdHdr, vvd );
+	DECLARE_PTR( OptimizedModel::FileHeader_t, vtxHdr, vtx );
+	
+	long checksumOld = mdlHdr->checksum;
+
+	// Don't do anything if the checksums don't match
+	if ( ( mdlHdr->checksum != vvdHdr->checksum ) ||
+		 ( mdlHdr->checksum != vtxHdr->checkSum ) )
+	{
+		DLog( "mdllib", 1, "ERROR: [StripModelBuffers] checksum mismatch!\n" );
+		return false;
+	}
+
+	// Modify the checksums
+	mdlHdr->checksum ^= ( mdlHdr->checksum * 123457 );
+	vvdHdr->checksum ^= ( vvdHdr->checksum * 123457 );
+	vtxHdr->checkSum ^= ( vtxHdr->checkSum * 123457 );
+
+	long checksumNew = mdlHdr->checksum;
+
+	// Allocate the model stripping info
+	CMdlStripInfo msi;
+	CMdlStripInfo *pMsi;
+
+	if ( ppStripInfo )
+	{
+		if ( *ppStripInfo )
+		{
+			pMsi = ( CMdlStripInfo * ) ( *ppStripInfo );
+			pMsi->Reset();
+		}
+		else
+		{
+			*ppStripInfo = pMsi = new CMdlStripInfo;
+		}
+	}
+	else
+	{
+		pMsi = &msi;
+	}
+
+	// Set the basic stripping info settings
+	pMsi->m_lChecksumOld = checksumOld;
+	pMsi->m_lChecksumNew = checksumNew;
+
+	//
+	// Early outs
+	//
+
+	if ( !( mdlHdr->flags & STUDIOHDR_FLAGS_STATIC_PROP ) )
+	{
+		DLog( "mdllib", 2, "No special stripping - the model is not a static prop.\n" );
+		pMsi->m_eMode = CMdlStripInfo::MODE_NO_CHANGE;
+		return true;
+	}
+
+	if ( vvdHdr->numLODs <= 1 )
+	{
+		DLog( "mdllib", 2, "No special stripping - the model has only %d lod(s).\n", vvdHdr->numLODs );
+		pMsi->m_eMode = CMdlStripInfo::MODE_NO_CHANGE;
+		return true;
+	}
+
+	if ( mdlHdr->numbones != 1 )
+	{
+		DLog( "mdllib", 2, "No special stripping - the model has %d bone(s).\n", mdlHdr->numbones );
+		pMsi->m_eMode = CMdlStripInfo::MODE_NO_CHANGE;
+		return true;
+	}
+
+	// Otherwise do stripping
+	pMsi->m_eMode = CMdlStripInfo::MODE_STRIP_LOD_1N;
+
+	
+	//
+	// ===================
+	// =================== Build out table of LOD0 vertexes
+	// ===================
+	//
+
+	CGrowableBitVec &mapVtxIndex = pMsi->m_vtxVerts;
+	ITERATE_CHILDREN2( OptimizedModel::BodyPartHeader_t, mstudiobodyparts_t, vtxBodyPart, mdlBodyPart, vtxHdr, mdlHdr, pBodyPart, pBodypart, numBodyParts )
+		ITERATE_CHILDREN2( OptimizedModel::ModelHeader_t, mstudiomodel_t, vtxModel, mdlModel, vtxBodyPart, mdlBodyPart, pModel, pModel, numModels )
+		
+			OptimizedModel::ModelLODHeader_t *vtxLod = CHILD_AT( vtxModel, pLOD, 0 );
+			ITERATE_CHILDREN2( OptimizedModel::MeshHeader_t, mstudiomesh_t, vtxMesh, mdlMesh, vtxLod, mdlModel, pMesh, pMesh, numMeshes )
+				ITERATE_CHILDREN( OptimizedModel::StripGroupHeader_t, vtxStripGroup, vtxMesh, pStripGroup, numStripGroups )
+					ITERATE_CHILDREN( OptimizedModel::StripHeader_t, vtxStrip, vtxStripGroup, pStrip, numStrips )
+					
+						if ( !( vtxStrip->flags & OptimizedModel::STRIP_IS_TRILIST ) )
+							continue;
+						for ( int i = 0; i < vtxStrip->numIndices; ++ i )
+						{
+							unsigned short *vtxIdx = CHILD_AT( vtxStripGroup, pIndex, vtxStrip->indexOffset + i );
+							OptimizedModel::Vertex_t *vtxVertex = CHILD_AT( vtxStripGroup, pVertex, *vtxIdx );
+							
+							unsigned short usIdx = vtxVertex->origMeshVertID + mdlMesh->vertexoffset;
+							mapVtxIndex.GrowSetBit( usIdx );
+						}
+
+					ITERATE_END
+				ITERATE_END
+			ITERATE_END
+		
+		ITERATE_END
+	ITERATE_END
+
+	//
+	// Now having the table of which vertexes to keep we will construct a remapping table
+	//
+	CUtlSortVector< unsigned short, CLessSimple< unsigned short > > &srcIndices = pMsi->m_vtxIndices;
+	srcIndices.EnsureCapacity( mapVtxIndex.GetNumBits() );
+	for ( int iBit = -1; ( iBit = mapVtxIndex.FindNextSetBit( iBit + 1 ) ) >= 0; )
+		srcIndices.InsertNoSort( ( unsigned short ) ( unsigned int ) iBit );
+	srcIndices.RedoSort(); // - doesn't do anything, just validates the vector
+
+	// Now we have the following questions answered:
+	//  - for every index we know if it belongs to lod0 "mapVtxIndex.IsBitSet( oldVertIdx )"
+	//  - for every new vertex we know its old index "srcIndices[ newVertIdx ]"
+	//  - for every old vertex if it's in lod0 we know its new index "srcIndices.Find( oldVertIdx )"
+
+	
+	//
+	// ===================
+	// =================== Process MDL file
+	// ===================
+	//
+
+	//
+	// Update vertex counts
+	//
+	int mdlNumVerticesOld = 0;
+	CUtlSortVector< CMdlStripInfo::MdlRangeItem, CLessSimple< CMdlStripInfo::MdlRangeItem > > &arrMdlOffsets = pMsi->m_vtxMdlOffsets;
+	ITERATE_CHILDREN( mstudiobodyparts_t, mdlBodyPart, mdlHdr, pBodypart, numbodyparts )
+		ITERATE_CHILDREN( mstudiomodel_t, mdlModel, mdlBodyPart, pModel, nummodels )
+			
+			DLog( "mdllib", 3, " Stripped %d lod(s).\n", vvdHdr->numLODs - 1 ),
+			DLog( "mdllib", 3, " Stripped %d vertexes (was: %d, now: %d).\n", mdlModel->numvertices - srcIndices.Count(), mdlModel->numvertices, srcIndices.Count() );
+
+			mdlNumVerticesOld = mdlModel->numvertices;
+			mdlModel->numvertices = srcIndices.Count();
+
+			mdlModel->vertexdata.pVertexData = BYTE_OFF_PTR( vvdHdr, vvdHdr->vertexDataStart );
+			mdlModel->vertexdata.pTangentData = BYTE_OFF_PTR( vvdHdr, vvdHdr->tangentDataStart );
+
+			ITERATE_CHILDREN( mstudiomesh_t, mdlMesh, mdlModel, pMesh, nummeshes )
+				
+				CMdlStripInfo::MdlRangeItem mdlRangeItem( mdlMesh->vertexoffset, mdlMesh->numvertices );
+				
+				mdlMesh->vertexdata.modelvertexdata = &mdlModel->vertexdata;
+				mdlMesh->numvertices = srcIndices.FindLess( mdlMesh->vertexoffset + mdlMesh->numvertices );
+				mdlMesh->vertexoffset = srcIndices.FindLess( mdlMesh->vertexoffset ) + 1;
+				mdlMesh->numvertices -= mdlMesh->vertexoffset - 1;
+
+				mdlRangeItem.m_offNew = mdlMesh->vertexoffset;
+				mdlRangeItem.m_numNew = mdlMesh->numvertices;
+				arrMdlOffsets.Insert( mdlRangeItem );
+
+				// Truncate the number of vertexes
+				for ( int k = 0; k < ARRAYSIZE( mdlMesh->vertexdata.numLODVertexes ); ++ k )
+					mdlMesh->vertexdata.numLODVertexes[ k ] = mdlMesh->numvertices;
+
+			ITERATE_END
+		ITERATE_END
+	ITERATE_END
+
+	//
+	// Update bones not to mention anything below LOD0
+	//
+	ITERATE_CHILDREN( mstudiobone_t, mdlBone, mdlHdr, pBone, numbones )
+		mdlBone->flags &= ( BONE_USED_BY_VERTEX_LOD0 | ~BONE_USED_BY_VERTEX_MASK );
+	ITERATE_END
+
+	DLog( "mdllib", 3, " Updated %d bone(s).\n", mdlHdr->numbones );
+
+	
+	//
+	// ===================
+	// =================== Process VVD file
+	// ===================
+	//
+
+	vvdHdr->numLODs = 1;
+	for ( int k = 0; k < ARRAYSIZE( vvdHdr->numLODVertexes ); ++ k )
+		vvdHdr->numLODVertexes[ k ] = srcIndices.Count();
+
+	DECLARE_PTR( mstudiovertex_t, vvdVertexSrc, BYTE_OFF_PTR( vvdHdr, vvdHdr->vertexDataStart ) );
+	DECLARE_PTR( Vector4D, vvdTangentSrc, vvdHdr->tangentDataStart ? BYTE_OFF_PTR( vvdHdr, vvdHdr->tangentDataStart ) : NULL );
+	
+	// Apply the fixups first of all
+	if ( vvdHdr->numFixups )
+	{
+		CArrayAutoPtr< byte > memTempVVD( new byte[ vvdLength ] );
+		DECLARE_PTR( mstudiovertex_t, vvdVertexNew, BYTE_OFF_PTR( memTempVVD.Get(), vvdHdr->vertexDataStart ) );
+		DECLARE_PTR( Vector4D, vvdTangentNew, BYTE_OFF_PTR( memTempVVD.Get(), vvdHdr->tangentDataStart ) );
+		DECLARE_PTR( vertexFileFixup_t, vvdFixup, BYTE_OFF_PTR( vvdHdr, vvdHdr->fixupTableStart ) );
+		for ( int k = 0; k < vvdHdr->numFixups; ++ k )
+		{
+			memcpy( vvdVertexNew, vvdVertexSrc + vvdFixup[ k ].sourceVertexID, vvdFixup[ k ].numVertexes * sizeof( *vvdVertexNew ) );
+			vvdVertexNew += vvdFixup[ k ].numVertexes;
+			if ( vvdTangentSrc )
+			{
+				memcpy( vvdTangentNew, vvdTangentSrc + vvdFixup[ k ].sourceVertexID, vvdFixup[ k ].numVertexes * sizeof( *vvdTangentNew ) );
+				vvdTangentNew += vvdFixup[ k ].numVertexes;
+			}
+		}
+
+		// Move back the memory after fixups were applied
+		vvdVertexSrc  ? memcpy( vvdVertexSrc, BYTE_OFF_PTR( memTempVVD.Get(), vvdHdr->vertexDataStart ), mdlNumVerticesOld * sizeof( *vvdVertexSrc ) ) : 0;
+		vvdTangentSrc ? memcpy( vvdTangentSrc, BYTE_OFF_PTR( memTempVVD.Get(), vvdHdr->tangentDataStart ), mdlNumVerticesOld * sizeof( *vvdTangentSrc ) ) : 0;
+	}
+	
+	vvdHdr->vertexDataStart -= ALIGN_VALUE( sizeof( vertexFileFixup_t ) * vvdHdr->numFixups, 16 );
+	vvdHdr->numFixups = 0;
+	DECLARE_PTR( mstudiovertex_t, vvdVertexNew, BYTE_OFF_PTR( vvdHdr, vvdHdr->vertexDataStart ) );
+	for ( int k = 0; k < srcIndices.Count(); ++ k )
+		vvdVertexNew[ k ] = vvdVertexSrc[ srcIndices[ k ] ];
+
+	size_t newVertexDataSize = srcIndices.Count() * sizeof( mstudiovertex_t );
+	int vvdLengthOld = vvdLength;
+	vvdLength = vvdHdr->vertexDataStart + newVertexDataSize;
+
+	if ( vvdTangentSrc )
+	{
+		// Move the tangents
+		vvdHdr->tangentDataStart = vvdLength;
+		DECLARE_PTR( Vector4D, vvdTangentNew, BYTE_OFF_PTR( vvdHdr, vvdHdr->tangentDataStart ) );
+
+		for ( int k = 0; k < srcIndices.Count(); ++ k )
+			vvdTangentNew[ k ] = vvdTangentSrc[ srcIndices[ k ] ];
+
+		vvdLength += srcIndices.Count() * sizeof( Vector4D );
+	}
+	DLog( "mdllib", 3, " Stripped %d vvd bytes.\n", vvdLengthOld - vvdLength );
+
+	
+	//
+	// ===================
+	// =================== Process VTX file
+	// ===================
+	//
+
+	size_t vtxOffIndexBuffer = ~size_t(0), vtxOffIndexBufferEnd = 0;
+	size_t vtxOffVertexBuffer = ~size_t(0), vtxOffVertexBufferEnd = 0;
+	CRemoveTracker vtxRemove;
+	CUtlVector< size_t > vtxOffIndex;
+	CUtlVector< size_t > vtxOffVertex;
+
+	vtxRemove.RemoveElements( CHILD_AT( vtxHdr, pMaterialReplacementList, 1 ), vtxHdr->numLODs - 1 );
+	ITERATE_CHILDREN( OptimizedModel::MaterialReplacementListHeader_t, vtxMatList, vtxHdr, pMaterialReplacementList, numLODs )
+		if ( !vtxMatList_idx ) continue;
+		vtxRemove.RemoveElements( CHILD_AT( vtxMatList, pMaterialReplacement, 0 ), vtxMatList->numReplacements );
+		ITERATE_CHILDREN( OptimizedModel::MaterialReplacementHeader_t, vtxMat, vtxMatList, pMaterialReplacement, numReplacements )
+			char const *szName = vtxMat->pMaterialReplacementName();
+			vtxRemove.RemoveElements( szName, szName ? strlen( szName ) + 1 : 0 );
+		ITERATE_END
+	ITERATE_END
+
+	ITERATE_CHILDREN( OptimizedModel::BodyPartHeader_t, vtxBodyPart, vtxHdr, pBodyPart, numBodyParts )
+		ITERATE_CHILDREN( OptimizedModel::ModelHeader_t, vtxModel, vtxBodyPart, pModel, numModels )
+		
+			vtxRemove.RemoveElements( CHILD_AT( vtxModel, pLOD, 1 ), vtxModel->numLODs - 1 );
+			ITERATE_CHILDREN( OptimizedModel::ModelLODHeader_t, vtxLod, vtxModel, pLOD, numLODs )
+				if ( !vtxLod_idx )	// Process only lod1-N
+					continue;
+				
+				vtxRemove.RemoveElements( CHILD_AT( vtxLod, pMesh, 0 ), vtxLod->numMeshes );
+				ITERATE_CHILDREN( OptimizedModel::MeshHeader_t, vtxMesh, vtxLod, pMesh, numMeshes )
+					vtxRemove.RemoveElements( CHILD_AT( vtxMesh, pStripGroup, 0 ), vtxMesh->numStripGroups );
+					ITERATE_CHILDREN( OptimizedModel::StripGroupHeader_t, vtxStripGroup, vtxMesh, pStripGroup, numStripGroups )
+						vtxRemove.RemoveElements( CHILD_AT( vtxStripGroup, pStrip, 0 ), vtxStripGroup->numStrips );
+						ITERATE_CHILDREN( OptimizedModel::StripHeader_t, vtxStrip, vtxStripGroup, pStrip, numStrips )
+							vtxRemove.RemoveElements( CHILD_AT( vtxStrip, pBoneStateChange, 0 ), vtxStrip->numBoneStateChanges );
+						ITERATE_END
+					ITERATE_END
+				ITERATE_END
+
+			ITERATE_END
+
+			// Use all lods to determine the ranges of vertex and index buffers.
+			// We rely on the fact that vertex and index buffers are laid out as one solid memory block for all lods.
+			ITERATE_CHILDREN( OptimizedModel::ModelLODHeader_t, vtxLod, vtxModel, pLOD, numLODs )
+				ITERATE_CHILDREN( OptimizedModel::MeshHeader_t, vtxMesh, vtxLod, pMesh, numMeshes )
+					ITERATE_CHILDREN( OptimizedModel::StripGroupHeader_t, vtxStripGroup, vtxMesh, pStripGroup, numStripGroups )
+
+						size_t offIndex = BYTE_DIFF_PTR( vtxHdr, CHILD_AT( vtxStripGroup, pIndex, 0 ) );
+						size_t offIndexEnd = BYTE_DIFF_PTR( vtxHdr, CHILD_AT( vtxStripGroup, pIndex, vtxStripGroup->numIndices ) );
+						size_t offVertex = BYTE_DIFF_PTR( vtxHdr, CHILD_AT( vtxStripGroup, pVertex, 0 ) );
+						size_t offVertexEnd = BYTE_DIFF_PTR( vtxHdr, CHILD_AT( vtxStripGroup, pVertex, vtxStripGroup->numVerts ) );
+
+						if ( offIndex < vtxOffIndexBuffer )
+							vtxOffIndexBuffer = offIndex;
+						if ( offIndexEnd > vtxOffIndexBufferEnd )
+							vtxOffIndexBufferEnd = offIndexEnd;
+						if ( offVertex < vtxOffVertexBuffer )
+							vtxOffVertexBuffer = offVertex;
+						if ( offVertexEnd > vtxOffVertexBufferEnd )
+							vtxOffVertexBufferEnd = offVertexEnd;
+
+						if ( !vtxLod_idx )
+						{
+							vtxOffIndex.AddToTail( offIndex );
+							vtxOffIndex.AddToTail( offIndexEnd );
+							vtxOffVertex.AddToTail( offVertex );
+							vtxOffVertex.AddToTail( offVertexEnd );
+						}
+
+					ITERATE_END
+				ITERATE_END
+			ITERATE_END
+
+		ITERATE_END
+	ITERATE_END
+
+	// Fixup the vertex buffer
+	DECLARE_PTR( OptimizedModel::Vertex_t, vtxVertexBuffer, BYTE_OFF_PTR( vtxHdr, vtxOffVertexBuffer ) );
+	DECLARE_PTR( OptimizedModel::Vertex_t, vtxVertexBufferEnd, BYTE_OFF_PTR( vtxHdr, vtxOffVertexBufferEnd ) );
+	CUtlVector< int > vtxIndexDeltas;
+	vtxIndexDeltas.EnsureCapacity( vtxVertexBufferEnd - vtxVertexBuffer );
+	int vtxNumVertexRemoved = 0;
+	for ( OptimizedModel::Vertex_t *vtxVertexElement = vtxVertexBuffer; vtxVertexElement < vtxVertexBufferEnd; ++ vtxVertexElement )
+	{
+		size_t const off = BYTE_DIFF_PTR( vtxHdr, vtxVertexElement );
+		bool bUsed = false;
+		for ( int k = 0; k < vtxOffVertex.Count(); k += 2 )
+		{
+			if ( off >= vtxOffVertex[ k ] && off < vtxOffVertex[ k + 1 ] )
+			{
+				bUsed = true;
+				break;
+			}
+		}
+		if ( !bUsed )
+		{
+			// Index is not in use
+			vtxRemove.RemoveElements( vtxVertexElement );
+			vtxIndexDeltas.AddToTail( 0 );
+			vtxNumVertexRemoved ++;
+		}
+		else
+		{	// Index is in use and must be remapped
+			// Find the mesh where this index belongs
+			int iMesh = arrMdlOffsets.FindLessOrEqual( CMdlStripInfo::MdlRangeItem( 0, 0, vtxVertexElement - vtxVertexBuffer ) );
+			Assert( iMesh >= 0 && iMesh < arrMdlOffsets.Count() );
+			
+			CMdlStripInfo::MdlRangeItem &mri = arrMdlOffsets[ iMesh ];
+			Assert( ( vtxVertexElement - vtxVertexBuffer >= mri.m_offNew ) && ( vtxVertexElement - vtxVertexBuffer < mri.m_offNew + mri.m_numNew ) );
+			
+			Assert( mapVtxIndex.IsBitSet( vtxVertexElement->origMeshVertID + mri.m_offOld ) );
+			vtxVertexElement->origMeshVertID = srcIndices.Find( vtxVertexElement->origMeshVertID + mri.m_offOld ) - mri.m_offNew;
+			Assert( vtxVertexElement->origMeshVertID < mri.m_numNew );
+			vtxIndexDeltas.AddToTail( vtxNumVertexRemoved );
+		}
+	}
+
+	// Fixup the index buffer
+	DECLARE_PTR( unsigned short, vtxIndexBuffer, BYTE_OFF_PTR( vtxHdr, vtxOffIndexBuffer ) );
+	DECLARE_PTR( unsigned short, vtxIndexBufferEnd, BYTE_OFF_PTR( vtxHdr, vtxOffIndexBufferEnd ) );
+	for ( unsigned short *vtxIndexElement = vtxIndexBuffer; vtxIndexElement < vtxIndexBufferEnd; ++ vtxIndexElement )
+	{
+		size_t const off = BYTE_DIFF_PTR( vtxHdr, vtxIndexElement );
+		bool bUsed = false;
+		for ( int k = 0; k < vtxOffIndex.Count(); k += 2 )
+		{
+			if ( off >= vtxOffIndex[ k ] && off < vtxOffIndex[ k + 1 ] )
+			{
+				bUsed = true;
+				break;
+			}
+		}
+		if ( !bUsed )
+		{
+			// Index is not in use
+			vtxRemove.RemoveElements( vtxIndexElement );
+		}
+		else
+		{
+			// Index is in use and must be remapped
+			*vtxIndexElement -= vtxIndexDeltas[ *vtxIndexElement ];
+		}
+	}
+
+	// By now should have scheduled all removal information
+	vtxRemove.Finalize();
+	DLog( "mdllib", 3, " Stripped %d vtx bytes.\n", vtxRemove.GetNumBytesRemoved() );
+
+	//
+	// Fixup all the offsets
+	//
+	ITERATE_CHILDREN( OptimizedModel::MaterialReplacementListHeader_t, vtxMatList, vtxHdr, pMaterialReplacementList, numLODs )
+		ITERATE_CHILDREN( OptimizedModel::MaterialReplacementHeader_t, vtxMat, vtxMatList, pMaterialReplacement, numReplacements )
+			vtxMat->replacementMaterialNameOffset = vtxRemove.ComputeOffset( vtxMat, vtxMat->replacementMaterialNameOffset );
+		ITERATE_END
+		vtxMatList->replacementOffset = vtxRemove.ComputeOffset( vtxMatList, vtxMatList->replacementOffset );
+	ITERATE_END
+	ITERATE_CHILDREN( OptimizedModel::BodyPartHeader_t, vtxBodyPart, vtxHdr, pBodyPart, numBodyParts )
+		ITERATE_CHILDREN( OptimizedModel::ModelHeader_t, vtxModel, vtxBodyPart, pModel, numModels )
+			ITERATE_CHILDREN( OptimizedModel::ModelLODHeader_t, vtxLod, vtxModel, pLOD, numLODs )
+				ITERATE_CHILDREN( OptimizedModel::MeshHeader_t, vtxMesh, vtxLod, pMesh, numMeshes )
+					ITERATE_CHILDREN( OptimizedModel::StripGroupHeader_t, vtxStripGroup, vtxMesh, pStripGroup, numStripGroups )
+						
+						ITERATE_CHILDREN( OptimizedModel::StripHeader_t, vtxStrip, vtxStripGroup, pStrip, numStrips )
+							vtxStrip->indexOffset =
+								vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->indexOffset + vtxStrip->indexOffset ) -
+								vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->indexOffset );
+							vtxStrip->vertOffset =
+								vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->vertOffset + vtxStrip->vertOffset ) -
+								vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->vertOffset );
+							vtxStrip->boneStateChangeOffset = vtxRemove.ComputeOffset( vtxStrip, vtxStrip->boneStateChangeOffset );
+						ITERATE_END
+
+						vtxStripGroup->vertOffset = vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->vertOffset );
+						vtxStripGroup->indexOffset = vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->indexOffset );
+						vtxStripGroup->stripOffset = vtxRemove.ComputeOffset( vtxStripGroup, vtxStripGroup->stripOffset );
+					ITERATE_END
+					vtxMesh->stripGroupHeaderOffset = vtxRemove.ComputeOffset( vtxMesh, vtxMesh->stripGroupHeaderOffset );
+				ITERATE_END
+				vtxLod->meshOffset = vtxRemove.ComputeOffset( vtxLod, vtxLod->meshOffset );
+			ITERATE_END
+			vtxModel->lodOffset = vtxRemove.ComputeOffset( vtxModel, vtxModel->lodOffset );
+			vtxModel->numLODs = 1;
+		ITERATE_END
+		vtxBodyPart->modelOffset = vtxRemove.ComputeOffset( vtxBodyPart, vtxBodyPart->modelOffset );
+	ITERATE_END
+	vtxHdr->materialReplacementListOffset = vtxRemove.ComputeOffset( vtxHdr, vtxHdr->materialReplacementListOffset );
+	vtxHdr->bodyPartOffset = vtxRemove.ComputeOffset( vtxHdr, vtxHdr->bodyPartOffset );
+	vtxHdr->numLODs = 1;
+
+	// Perform final memory move
+	vtxRemove.MemMove( vtxHdr, vtxLength );
+
+
+	//
+	// ===================
+	// =================== Truncate buffer sizes
+	// ===================
+	//
+
+	vvdBuffer.SeekPut( CUtlBuffer::SEEK_CURRENT, vvdBuffer.TellGet() + vvdLength - vvdBuffer.TellPut() );
+	vtxBuffer.SeekPut( CUtlBuffer::SEEK_CURRENT, vtxBuffer.TellGet() + vtxLength - vtxBuffer.TellPut() );
+
+
+	DLog( "mdllib", 2, " Reduced model buffers by %d bytes.\n", vtxRemove.GetNumBytesRemoved() + ( vvdLengthOld - vvdLength ) );
+
+	// Done
+	return true;
+}
+
diff --git a/mdllib/mdllib_utils.cpp b/mdllib/mdllib_utils.cpp
new file mode 100644
index 0000000..77ec4fa
--- /dev/null
+++ b/mdllib/mdllib_utils.cpp
@@ -0,0 +1,205 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+
+#include "mdllib_utils.h"
+
+
+//////////////////////////////////////////////////////////////////////////
+//
+// CInsertionTracker implementation
+//
+//////////////////////////////////////////////////////////////////////////
+
+
+void CInsertionTracker::InsertBytes( void *pos, int length )
+{
+	if ( length <= 0 )
+		return;
+
+	Assert( m_map.InvalidIndex() == m_map.Find( ( byte * ) pos ) );
+	m_map.InsertOrReplace( ( byte * ) pos, length );
+}
+
+int CInsertionTracker::GetNumBytesInserted() const
+{
+	int iInserted = 0;
+
+	for ( Map::IndexType_t idx = m_map.FirstInorder();
+		idx != m_map.InvalidIndex(); idx = m_map.NextInorder( idx ) )
+	{
+		int numBytes = m_map.Element( idx );
+		iInserted += numBytes;
+	}
+
+	return iInserted;
+}
+
+void CInsertionTracker::Finalize()
+{
+	// Iterate the map and find all the adjacent removal data blocks
+	// TODO:
+}
+
+void CInsertionTracker::MemMove( void *ptrBase, int &length ) const
+{
+	int numBytesInsertReq = GetNumBytesInserted();
+	byte *pbBlockEnd = BYTE_OFF_PTR( ptrBase, length );
+	length += numBytesInsertReq;
+
+	for ( Map::IndexType_t idx = m_map.LastInorder();
+		idx != m_map.InvalidIndex(); idx = m_map.PrevInorder( idx ) )
+	{
+		byte *ptr = m_map.Key( idx );
+		int numBytes = m_map.Element( idx );
+
+		// Move [ptr, pbBlockEnd) ->> + numBytesInsertReq
+		memmove( BYTE_OFF_PTR( ptr, numBytesInsertReq ), ptr, BYTE_DIFF_PTR( ptr, pbBlockEnd ) );
+
+		// Inserted data
+		memset( BYTE_OFF_PTR( ptr, numBytesInsertReq - numBytes ), 0, numBytes );
+
+		numBytesInsertReq -= numBytes;
+		pbBlockEnd = ptr;
+	}
+}
+
+int CInsertionTracker::ComputeOffset( void *ptrBase, int off ) const
+{
+	void *ptrNewBase = ComputePointer( ptrBase );
+	void *ptrNewData = ComputePointer( BYTE_OFF_PTR( ptrBase, off ) );
+	return BYTE_DIFF_PTR( ptrNewBase, ptrNewData );
+}
+
+void * CInsertionTracker::ComputePointer( void *ptrNothingInserted ) const
+{
+	int iInserted = 0;
+
+	// Iterate the map and find all the data that would be inserted before the given pointer
+	for ( Map::IndexType_t idx = m_map.FirstInorder();
+		idx != m_map.InvalidIndex(); idx = m_map.NextInorder( idx ) )
+	{
+		if ( m_map.Key( idx ) < ptrNothingInserted )
+			iInserted += m_map.Element( idx );
+		else
+			break;
+	}
+
+	return BYTE_OFF_PTR( ptrNothingInserted, iInserted );
+}
+
+
+
+//////////////////////////////////////////////////////////////////////////
+//
+// CRemoveTracker implementation
+//
+//////////////////////////////////////////////////////////////////////////
+
+
+void CRemoveTracker::RemoveBytes( void *pos, int length )
+{
+	if ( length <= 0 )
+		return;
+
+	// -- hint
+	if ( m_map.Count() )
+	{
+		if ( m_hint.ptr < pos )
+		{
+			if ( BYTE_OFF_PTR( m_hint.ptr, m_hint.len ) == pos )
+			{
+				m_hint.len += length;
+				m_map.Element( m_hint.idx ) = m_hint.len;
+				return;
+			}
+		}
+		else if ( m_hint.ptr > pos )
+		{
+			if ( BYTE_OFF_PTR( pos, length ) == m_hint.ptr )
+			{
+				m_hint.len += length;
+				m_hint.ptr = BYTE_OFF_PTR( m_hint.ptr, - length );
+				m_map.Key( m_hint.idx ) = m_hint.ptr;
+				m_map.Element( m_hint.idx ) = m_hint.len;
+				return;
+			}
+		}
+	}
+	// -- end hint
+
+	// Insert new
+	Assert( m_map.InvalidIndex() == m_map.Find( ( byte * ) pos ) );
+	Map::IndexType_t idx = m_map.InsertOrReplace( ( byte * ) pos, length );
+	
+	// New hint
+	m_hint.idx = idx;
+	m_hint.ptr = ( byte * ) pos;
+	m_hint.len = length;
+}
+
+int CRemoveTracker::GetNumBytesRemoved() const
+{
+	int iRemoved = 0;
+
+	for ( Map::IndexType_t idx = m_map.FirstInorder();
+		idx != m_map.InvalidIndex(); idx = m_map.NextInorder( idx ) )
+	{
+		int numBytes = m_map.Element( idx );
+		iRemoved += numBytes;
+	}
+
+	return iRemoved;
+}
+
+void CRemoveTracker::Finalize()
+{
+	// Iterate the map and find all the adjacent removal data blocks
+	// TODO:
+}
+
+void CRemoveTracker::MemMove( void *ptrBase, int &length ) const
+{
+	int iRemoved = 0;
+
+	for ( Map::IndexType_t idx = m_map.FirstInorder();
+		idx != m_map.InvalidIndex(); idx = m_map.NextInorder( idx ) )
+	{
+		byte *ptr = m_map.Key( idx );
+		byte *ptrDest = BYTE_OFF_PTR( ptr, - iRemoved );
+		int numBytes = m_map.Element( idx );
+		memmove( ptrDest, BYTE_OFF_PTR( ptrDest, numBytes ), BYTE_DIFF_PTR( BYTE_OFF_PTR( ptr, numBytes ), BYTE_OFF_PTR( ptrBase, length ) ) );
+		iRemoved += numBytes;
+	}
+
+	length -= iRemoved;
+}
+
+int CRemoveTracker::ComputeOffset( void *ptrBase, int off ) const
+{
+	void *ptrNewBase = ComputePointer( ptrBase );
+	void *ptrNewData = ComputePointer( BYTE_OFF_PTR( ptrBase, off ) );
+	return BYTE_DIFF_PTR( ptrNewBase, ptrNewData );
+}
+
+void * CRemoveTracker::ComputePointer( void *ptrNothingRemoved ) const
+{
+	int iRemoved = 0;
+
+	// Iterate the map and find all the data that would be removed before the given pointer
+	for ( Map::IndexType_t idx = m_map.FirstInorder();
+		idx != m_map.InvalidIndex(); idx = m_map.NextInorder( idx ) )
+	{
+		if ( m_map.Key( idx ) < ptrNothingRemoved )
+			iRemoved += m_map.Element( idx );
+		else
+			break;
+	}
+
+	return BYTE_OFF_PTR( ptrNothingRemoved, - iRemoved );
+}
+
+
diff --git a/mdllib/mdllib_utils.h b/mdllib/mdllib_utils.h
new file mode 100644
index 0000000..cf14629
--- /dev/null
+++ b/mdllib/mdllib_utils.h
@@ -0,0 +1,203 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//=============================================================================
+
+#ifndef MDLLIB_UTILS_H
+#define MDLLIB_UTILS_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "utlmap.h"
+#include "utlvector.h"
+#include "bitvec.h"
+
+
+//////////////////////////////////////////////////////////////////////////
+//
+// Helper macros
+//
+//////////////////////////////////////////////////////////////////////////
+
+// Declare a pointer and automatically do the cast of initial value to the pointer type
+#define DECLARE_PTR( type, name, initval ) type *name = ( type * ) ( initval )
+
+// Compute a pointer that is offset given number of bytes from the base pointer
+#define BYTE_OFF_PTR( initval, offval ) ( ( ( byte * ) ( initval ) ) + ( offval ) )
+
+// Compute difference in bytes between two pointers
+#define BYTE_DIFF_PTR( begin, end ) ( ( ( byte * ) ( end ) ) - ( ( byte * ) ( begin ) ) )
+
+
+// "for {" to iterate children of a studio container
+#define ITERATE_CHILDREN( type, name, parent, accessor, count )					\
+	for ( int name##_idx = 0; name##_idx < (parent)->count; ++ name##_idx ) {	\
+			type *name = (parent)->accessor( name##_idx );
+
+// "for {" to jointly iterate children of 2 studio containers of same size
+#define ITERATE_CHILDREN2( type, type2, name, name2, parent, parent2, accessor, accessor2, count )	\
+	for ( int name##_idx = 0; name##_idx < (parent)->count; ++ name##_idx ) {	\
+			type *name = (parent)->accessor( name##_idx );					\
+			type2 *name2 = (parent2)->accessor2( name##_idx );
+
+// "}" to mark the end of iteration block
+#define ITERATE_END }
+
+// Get the child of a container by index
+#define CHILD_AT( parent, accessor, idx ) ( (parent)->accessor( idx ) )
+
+
+//
+// CLessSimple< T >
+//	Comparison policy to use "t1 < t2" comparison rule.
+//
+template < typename T >
+class CLessSimple
+{
+public:
+	bool Less( const T& src1, const T& src2, void *pCtx )
+	{
+		pCtx;
+		return ( src1 < src2 );
+	}
+};
+
+//
+// CInsertionTracker
+//	Class that is tracking insertions that are scheduled to happen at given points.
+//	Use policy:
+//		InsertBytes / InsertElements	[*]		-- schedule insertions
+//		Finalize								-- finalize insertion information
+//		ComputePointer / ComputeOffset	[*]		-- compute new pointers/offsets that will happen after insertions
+//		MemMove									-- perform memory moves to apply insertions
+//
+class CInsertionTracker
+{
+public:
+	CInsertionTracker() : m_map( DefLessFunc( byte * ) ) {}
+
+	// Schedules a piece of memory for insertion
+public:
+	void InsertBytes( void *pos, int length );
+
+	template< typename T >
+	void InsertElements( T *ptr, int count = 1 ) { InsertBytes( ( byte * ) ptr, count * sizeof( T ) ); }
+
+	int GetNumBytesInserted() const;
+
+	// Finalizes the insertion information
+public:
+	void Finalize();
+
+	// Computes where the pointer would point after memory insertion occurs
+public:
+	void * ComputePointer( void *ptrNothingInserted ) const;
+	int ComputeOffset( void *ptrBase, int off ) const;
+
+	// Perform memory moves, the buffer should be large enough to accommodate inserted bytes
+public:
+	void MemMove( void *ptrBase, int &length ) const;
+
+protected:
+	typedef CUtlMap< byte *, int, unsigned int > Map;
+	Map m_map; // pos -> length
+};
+
+
+//
+// CRemoveTracker
+//	Class that is tracking removals that are scheduled to happen at given points.
+//	Use policy:
+//		RemoveBytes / RemoveElements	[*]		-- schedule removals
+//		Finalize								-- finalize removal information
+//		ComputePointer / ComputeOffset	[*]		-- compute new pointers/offsets that will happen after removals
+//		MemMove									-- perform memory moves to apply removals
+//
+class CRemoveTracker
+{
+public:
+	CRemoveTracker() : m_map( DefLessFunc( byte * ) ) {}
+
+	// Schedules a piece of memory for removal
+public:
+	void RemoveBytes( void *pos, int length );
+	
+	template< typename T >
+	void RemoveElements( T *ptr, int count = 1 ) { RemoveBytes( ( byte * ) ptr, count * sizeof( T ) ); }
+
+	int GetNumBytesRemoved() const;
+
+	// Finalizes the removal information
+public:
+	void Finalize();
+
+	// Computes where the pointer would point after memory removal occurs
+public:
+	void * ComputePointer( void *ptrNothingRemoved ) const;
+	int ComputeOffset( void *ptrBase, int off ) const;
+
+public:
+	void MemMove( void *ptrBase, int &length ) const;
+
+protected:
+	typedef CUtlMap< byte *, int, unsigned int > Map;
+	Map m_map; // pos -> length
+
+	struct Item
+	{
+		Map::IndexType_t idx;
+		byte *ptr;
+		int len;
+	};
+	Item m_hint;
+};
+
+
+//
+// CGrowableBitVec
+//	Serves bit accumulation.
+//	Provides "GrowSetBit" method to automatically grow to the required size
+//	and set the given bit.
+//	Provides safe "IsBitSet" that would return false for missing bits.
+//
+class CGrowableBitVec : public CVarBitVec
+{
+public:
+	void GrowSetBit( int iBit )
+	{
+		if ( iBit >= GetNumBits() )
+			Resize( iBit + 1, false );
+		Set( iBit );
+	}
+
+	bool IsBitSet( int bitNum ) const
+	{
+		return ( bitNum < GetNumBits() ) && CVarBitVec::IsBitSet( bitNum );
+	}
+};
+
+
+//
+// CGrowableVector
+//	Provides zero-initialization for new elements.
+//
+template < typename T >
+class CGrowableVector : public CUtlVector < T >
+{
+public:
+	T & operator[] ( int idx )
+	{
+		while ( idx >= Count() )
+			AddToTail( T() );
+		return CUtlVector < T >::operator []( idx );
+	}
+};
+
+
+
+
+#endif // #ifndef MDLLIB_UTILS_H