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diff --git a/external/vpc/public/p4lib/ip4.h b/external/vpc/public/p4lib/ip4.h
new file mode 100644
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+++ b/external/vpc/public/p4lib/ip4.h
@@ -0,0 +1,191 @@
+//====== Copyright � 1996-2005, Valve Corporation, All rights reserved. =======
+//
+// Purpose: 
+//
+//=============================================================================
+
+#ifndef IP4_H
+#define IP4_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "tier1/utlsymbol.h"
+#include "tier1/utlvector.h"
+#include "tier1/utlstring.h"
+#include "appframework/iappsystem.h"
+
+
+//-----------------------------------------------------------------------------
+// Current perforce file state
+//-----------------------------------------------------------------------------
+enum P4FileState_t
+{
+	P4FILE_UNOPENED = 0,
+	P4FILE_OPENED_FOR_ADD,
+	P4FILE_OPENED_FOR_EDIT,
+	P4FILE_OPENED_FOR_DELETE,
+	P4FILE_OPENED_FOR_INTEGRATE,
+};
+
+
+//-----------------------------------------------------------------------------
+// Purpose: definition of a file
+//-----------------------------------------------------------------------------
+struct P4File_t
+{
+	CUtlSymbol m_sName;			// file name
+	CUtlSymbol m_sPath;			// residing folder
+	CUtlSymbol m_sDepotFile;	// the name in the depot
+	CUtlSymbol m_sClientFile;	// the name on the client in Perforce syntax
+	CUtlSymbol m_sLocalFile;	// the name on the client in local syntax
+	int m_iHeadRevision;		// head revision number
+	int m_iHaveRevision;		// the revision the clientspec has synced locally
+	bool m_bOpenedByOther;		// opened by another user
+	bool m_bDir;				// directory
+	bool m_bDeleted;			// deleted
+	P4FileState_t m_eOpenState;	// current change state
+	int m_iChangelist;			// changelist current opened in
+};
+
+
+//-----------------------------------------------------------------------------
+// Purpose: a single revision of a file
+//-----------------------------------------------------------------------------
+struct P4Revision_t
+{
+	int m_iChange;		// changelist number
+	int m_nYear, m_nMonth, m_nDay;
+	int m_nHour, m_nMinute, m_nSecond;
+
+	CUtlSymbol m_sUser;		// submitting user
+	CUtlSymbol m_sClient;	// submitting client 
+	CUtlString m_Description;
+};
+
+
+//-----------------------------------------------------------------------------
+// Purpose: a single clientspec
+//-----------------------------------------------------------------------------
+struct P4Client_t
+{
+	CUtlSymbol m_sName;
+	CUtlSymbol m_sUser;
+	CUtlSymbol m_sHost;			// machine name this client is on
+	CUtlSymbol m_sLocalRoot;	// local path
+};
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Interface to accessing P4 commands
+//-----------------------------------------------------------------------------
+#define P4_MAX_INPUT_BUFFER_SIZE	16384		// descriptions should be limited to this size!
+
+abstract_class IP4  : public IAppSystem
+{
+public:
+	// name of the current clientspec
+	virtual P4Client_t &GetActiveClient() = 0;
+
+	// changes the current client
+	virtual void SetActiveClient(const char *clientname) = 0;
+
+	// Refreshes the current client from p4 settings
+	virtual void RefreshActiveClient() = 0;
+
+	// translate filespecs into the desired syntax
+	virtual void GetDepotFilePath(char *depotFilePath, const char *filespec, int size) = 0;
+	virtual void GetClientFilePath(char *clientFilePath, const char *filespec, int size) = 0;
+	virtual void GetLocalFilePath(char *localFilePath, const char *filespec, int size) = 0;
+
+	// retreives the list of files in a path
+	virtual CUtlVector<P4File_t> &GetFileList( const char *path ) = 0;
+
+	// returns the list of files opened for edit/integrate/delete 
+	virtual void GetOpenedFileList( CUtlVector<P4File_t> &fileList, bool bDefaultChangeOnly ) = 0;
+	virtual void GetOpenedFileList( const char *pRootDirectory, CUtlVector<P4File_t> &fileList ) = 0;
+	virtual void GetOpenedFileListInPath( const char *pPathID, CUtlVector<P4File_t> &fileList ) = 0;
+
+	// retrieves revision history for a file or directory
+	virtual CUtlVector<P4Revision_t> &GetRevisionList( const char *path, bool bIsDir ) = 0;
+
+	// returns a list of clientspecs
+	virtual CUtlVector<P4Client_t> &GetClientList() = 0;
+
+	// changes the clientspec to remove the specified path (cloaking)
+	virtual void RemovePathFromActiveClientspec( const char *path ) = 0;
+
+	// file manipulation
+	virtual bool OpenFileForAdd( const char *pFullPath ) = 0;
+	virtual bool OpenFileForEdit( const char *pFullPath ) = 0;
+	virtual bool OpenFileForDelete( const char *pFullPath ) = 0;
+	virtual bool SyncFile( const char *pFullPath, int nRevision = -1 ) = 0;	// default revision is to sync to the head revision
+
+	// submit/revert
+	virtual bool SubmitFile( const char *pFullPath, const char *pDescription ) = 0;
+	virtual bool RevertFile( const char *pFullPath ) = 0;
+
+	// file checkin/checkout for multiple files
+	virtual bool OpenFilesForAdd( int nCount, const char **ppFullPathList ) = 0;
+	virtual bool OpenFilesForEdit( int nCount, const char **ppFullPathList ) = 0;
+	virtual bool OpenFilesForDelete( int nCount, const char **ppFullPathList ) = 0;
+
+	// submit/revert for multiple files
+	virtual bool SubmitFiles( int nCount, const char **ppFullPathList, const char *pDescription ) = 0;
+	virtual bool RevertFiles( int nCount, const char **ppFullPathList ) = 0;
+
+	// Is this file in perforce?
+	virtual bool IsFileInPerforce( const char *pFullPath ) = 0;
+
+	// Get the perforce file state
+	virtual P4FileState_t GetFileState( const char *pFullPath ) = 0;
+
+	// depot root
+	virtual const char *GetDepotRoot() = 0;
+	virtual int GetDepotRootLength() = 0;
+
+	// local root
+	virtual const char *GetLocalRoot() = 0;
+	virtual int GetLocalRootLength() = 0;
+
+	// Gets a string for a symbol
+	virtual const char *String( CUtlSymbol s ) const = 0;
+
+	// Returns which clientspec a file lies under. This will
+	// search for p4config files in root directories of the file
+	// It returns false if it didn't find a p4config file.
+	virtual bool GetClientSpecForFile( const char *pFullPath, char *pClientSpec, int nMaxLen ) = 0;
+	virtual bool GetClientSpecForDirectory( const char *pFullPathDir, char *pClientSpec, int nMaxLen ) = 0;
+
+	// Returns which clientspec a filesystem path ID lies under. This will
+	// search for p4config files in all root directories of the all paths in
+	// the search path. NOTE: All directories in a path need to use the same clientspec
+	// or this function will return false.
+	// It returns false if it didn't find a p4config file.
+	virtual bool GetClientSpecForPath( const char *pPathId, char *pClientSpec, int nMaxLen ) = 0;
+
+	// Opens a file in p4 win
+	virtual void OpenFileInP4Win( const char *pFullPath ) = 0;
+
+	// have we connected? if not, nothing works
+	virtual bool IsConnectedToServer( bool bRetry = true ) = 0;
+
+	// Returns file information for a single file
+	virtual bool GetFileInfo( const char *pFullPath, P4File_t *pFileInfo ) = 0;
+
+	// retrieves the list of files in a path, using a known client spec
+	virtual CUtlVector<P4File_t> &GetFileListUsingClientSpec( const char *pPath, const char *pClientSpec ) = 0;
+
+	// retrieves the last error from the last op (which is likely to span multiple lines)
+	// this is only valid after OpenFile[s]For{Add,Edit,Delete} or {Submit,Revert}File[s]
+	virtual const char *GetLastError() = 0;
+
+	// sets the name of the changelist to open files under, NULL for "Default" changelist
+	virtual void SetOpenFileChangeList( const char *pChangeListName ) = 0;
+
+	virtual void GetFileListInChangelist( unsigned int changeListNumber, CUtlVector<P4File_t> &fileList ) = 0;
+};
+
+DECLARE_TIER2_INTERFACE( IP4, p4 );
+
+#endif // IP4_H