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hammer/prefabs.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: Implements a system for managing prefabs. There are two types
+//			of prefabs implemented here: Half-Life style prefabs, and Half-Life 2
+//			style prefabs.
+//
+//			For Half-Life, prefab libraries are stored as binary .OL files, each of
+//			which contains multiple .RMF files that are the prefabs.
+//
+//			For Half-Life 2, prefabs are stored in a tree of folders, each folder
+//			representing a library, and the each .VMF file in the folder containing
+//			a single prefab.
+//
+//=============================================================================//
+
+
+#include "stdafx.h"
+#include "Prefabs.h"
+#include "Prefab3D.h"
+#include "hammer.h"
+#include <io.h>
+#include <fcntl.h>
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include <tier0/memdbgon.h>
+
+
+BOOL CPrefab::bCacheEnabled = TRUE;
+CPrefabList CPrefab::PrefabList;
+CPrefabList CPrefab::MRU;
+CPrefabLibraryList CPrefabLibrary::PrefabLibraryList;
+
+
+static char *pLibHeader = "Worldcraft Prefab Library\r\n\x1a";
+static float fLibVersion = 0.1f;
+
+
+typedef struct
+{
+	DWORD dwOffset;
+	DWORD dwSize;
+	char szName[31];
+	char szNotes[MAX_NOTES];
+	int iType;
+} PrefabHeader;
+
+
+typedef struct
+{
+	float fVersion;
+	DWORD dwDirOffset;
+	DWORD dwNumEntries;
+	char szNotes[MAX_NOTES];
+} PrefabLibraryHeader;
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Creates a prefab library from a given path.
+// Input  : szFile - 
+// Output : 
+//-----------------------------------------------------------------------------
+CPrefabLibrary *CreatePrefabLibrary(const char *szFile)
+{
+	CPrefabLibrary *pLibrary;
+
+	if (stricmp(&szFile[strlen(szFile) - 2], ".ol") != 0)
+	{
+		pLibrary = new CPrefabLibraryVMF;
+	}
+	else
+	{
+		pLibrary = new CPrefabLibraryRMF;
+	}
+
+	if (pLibrary->Load(szFile) == -1)
+	{
+		delete pLibrary;
+		return(NULL);
+	}
+
+	return(pLibrary);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CPrefab::CPrefab()
+{
+	static DWORD dwRunningID = 1;
+	// assign running ID
+	dwID = dwRunningID++;
+	PrefabList.AddTail(this);
+
+	// assign blank name/notes
+	szName[0] = szNotes[0] = 0;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CPrefab::~CPrefab()
+{
+	POSITION p = PrefabList.Find(this);
+	if(p)
+		PrefabList.RemoveAt(p);
+	p = MRU.Find(this);
+	if(p)
+		MRU.RemoveAt(p);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : dwID - 
+// Output : CPrefab *
+//-----------------------------------------------------------------------------
+CPrefab * CPrefab::FindID(DWORD dwID)
+{
+	POSITION p = PrefabList.GetHeadPosition();
+	while(p)
+	{
+		CPrefab *pPrefab = PrefabList.GetNext(p);
+		if(pPrefab->dwID == dwID)
+			return pPrefab;
+	}
+
+	return NULL;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : b - 
+//-----------------------------------------------------------------------------
+void CPrefab::EnableCaching(BOOL b)
+{
+	bCacheEnabled = b;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : *pPrefab - 
+//-----------------------------------------------------------------------------
+void CPrefab::AddMRU(CPrefab *pPrefab)
+{
+	if(!bCacheEnabled)
+		return;
+
+	POSITION p = MRU.Find(pPrefab);
+	if(p)
+	{
+		// remove there and add to head
+		MRU.RemoveAt(p);
+	}
+	else if(MRU.GetCount() == 5)
+	{
+		// uncache tail object
+		p = MRU.GetTailPosition();
+		if(p)	// might not be any yet
+		{
+			CPrefab *pUncache = MRU.GetAt(p);
+			pUncache->FreeData();
+			MRU.RemoveAt(p);
+		}
+	}
+
+	// add to head
+	MRU.AddHead(pPrefab);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+void CPrefab::FreeAllData()
+{
+	// free all prefab data memory
+	POSITION p = PrefabList.GetHeadPosition();
+	while(p)
+	{
+		CPrefab *pPrefab = PrefabList.GetNext(p);
+		pPrefab->FreeData();
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pszFilename - 
+// Output : CPrefab::pfiletype_t
+//-----------------------------------------------------------------------------
+CPrefab::pfiletype_t CPrefab::CheckFileType(LPCTSTR pszFilename)
+{
+	// first check extensions
+	const char *p = strrchr(pszFilename, '.');
+	if(p)
+	{
+		if(!strcmpi(p, ".rmf"))
+			return pftRMF;
+		else if(!strcmpi(p, ".map"))
+			return pftMAP;
+		else if(!strcmpi(p, ".os"))
+			return pftScript;
+	}
+
+	std::fstream file(pszFilename, std::ios::in | std::ios::binary);
+
+	// read first 16 bytes of file
+	char szBuf[255];
+	file.read(szBuf, 16);
+
+	// check 1: RMF
+	float f = ((float*) szBuf)[0];
+
+	// 0.8 was version at which RMF tag was started
+	if(f <= 0.7f || !strncmp(szBuf+sizeof(float), "RMF", 3))
+	{
+		return pftRMF;
+	}
+
+	// check 2: script
+	if(!strnicmp(szBuf, "[Script", 7))
+	{
+		return pftScript;
+	}
+
+	// check 3: MAP
+	int i = 500;
+	while(i--)
+	{
+		file >> std::ws;
+		file.getline(szBuf, 255);
+		if(szBuf[0] == '{')
+			return pftMAP;
+		if(file.eof())
+			break;
+	}
+
+	return pftUnknown;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CPrefabLibrary::CPrefabLibrary()
+{
+	static DWORD dwRunningID = 1;
+	// assign running ID
+	dwID = dwRunningID++;
+	m_szName[0] = '\0';
+	szNotes[0] = '\0';
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CPrefabLibrary::~CPrefabLibrary()
+{
+	FreePrefabs();
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+void CPrefabLibrary::FreePrefabs()
+{
+	// nuke prefabs
+	POSITION p = Prefabs.GetHeadPosition();
+	while (p != NULL)
+	{
+		CPrefab *pPrefab = Prefabs.GetNext(p);
+		delete pPrefab;
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : *a - 
+//			*b - 
+// Output : static int
+//-----------------------------------------------------------------------------
+static int __cdecl SortPrefabs(CPrefab *a, CPrefab *b)
+{
+	return(strcmpi(a->GetName(), b->GetName()));
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+void CPrefabLibrary::Sort(void)
+{
+	int nPrefabs = Prefabs.GetCount();
+	if (nPrefabs < 2)
+	{
+		return;
+	}
+
+	CPrefab **TmpPrefabArray = new CPrefab *[nPrefabs];
+
+	//
+	// Make an array we can pass to qsort.
+	//
+	POSITION p = ENUM_START;
+	CPrefab *pPrefab = EnumPrefabs(p);
+	int iPrefab = 0;
+	while (pPrefab != NULL)
+	{
+		TmpPrefabArray[iPrefab++] = pPrefab;
+		pPrefab = EnumPrefabs(p);
+	}
+
+	//
+	// Sort the prefabs array by name.
+	//
+	qsort(TmpPrefabArray, nPrefabs, sizeof(CPrefab *), (int (__cdecl *)(const void *, const void *))SortPrefabs);
+
+	//
+	// Store back in list in sorted order.
+	//
+	Prefabs.RemoveAll();
+	for (int i = 0; i < nPrefabs; i++)
+	{
+		Prefabs.AddTail(TmpPrefabArray[i]);
+	}
+
+	delete[] TmpPrefabArray;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pszFilename - 
+//-----------------------------------------------------------------------------
+void CPrefabLibrary::SetNameFromFilename(LPCTSTR pszFilename)
+{
+	const char *cp = strrchr(pszFilename, '\\');
+	strcpy(m_szName, cp ? (cp + 1) : pszFilename);
+	char *p = strchr(m_szName, '.');
+	if (p != NULL)
+	{
+		p[0] = '\0';
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Frees all the libraries in the prefab library list.
+//-----------------------------------------------------------------------------
+void CPrefabLibrary::FreeAllLibraries(void)
+{
+	POSITION pos = PrefabLibraryList.GetHeadPosition();
+	while (pos != NULL)
+	{
+		CPrefabLibrary *pPrefabLibrary = PrefabLibraryList.GetNext(pos);
+		if (pPrefabLibrary != NULL)
+		{
+			delete pPrefabLibrary;
+		}
+	}
+
+	PrefabLibraryList.RemoveAll();
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Load all libraries in the prefabs directory.
+//-----------------------------------------------------------------------------
+void CPrefabLibrary::LoadAllLibraries()
+{
+	char szDir[MAX_PATH];
+	char szFile[MAX_PATH];
+	((CHammer *)AfxGetApp())->GetDirectory(DIR_PREFABS, szDir);
+
+	//
+	// Add one prefab library for the root prefabs folder in case they put something there.
+	//
+	CPrefabLibrary *pLibrary = FindOpenLibrary(szDir);
+	if (pLibrary == NULL)
+	{
+		pLibrary = CreatePrefabLibrary(szDir);
+		if (pLibrary != NULL)
+		{
+			PrefabLibraryList.AddTail(pLibrary);
+		}
+	}
+	else
+	{
+		pLibrary->Load(szDir);
+	}
+
+	strcat(szDir, "\\*.*");
+
+	WIN32_FIND_DATA fd;
+	HANDLE hnd = FindFirstFile(szDir, &fd);
+	strrchr(szDir, '\\')[0] = 0;	// truncate that
+
+	if (hnd == INVALID_HANDLE_VALUE)
+	{
+		return;	// no libraries
+	}
+
+	do
+	{
+		if ((fd.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) && (fd.cFileName[0] != '.'))
+		{
+			sprintf(szFile, "%s\\%s", szDir, fd.cFileName);
+
+			pLibrary = FindOpenLibrary(szFile);
+			if (pLibrary == NULL)
+			{
+				pLibrary = CreatePrefabLibrary(szFile);
+				if (pLibrary != NULL)
+				{
+					PrefabLibraryList.AddTail(pLibrary);
+				}
+			}
+			else
+			{
+				pLibrary->Load(szDir);
+			}
+		}
+	} while (FindNextFile(hnd, &fd));
+
+	FindClose(hnd);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : *pPrefab - 
+//-----------------------------------------------------------------------------
+void CPrefabLibrary::Add(CPrefab *pPrefab)
+{
+	if(!Prefabs.Find(pPrefab))
+		Prefabs.AddTail(pPrefab);
+	pPrefab->dwLibID = dwID;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : *pPrefab - 
+//-----------------------------------------------------------------------------
+void CPrefabLibrary::Remove(CPrefab *pPrefab)
+{
+	POSITION p = Prefabs.Find(pPrefab);
+	if(p)
+		Prefabs.RemoveAt(p);
+	if(pPrefab->dwLibID == dwID)	// make sure it doesn't reference this
+		pPrefab->dwLibID = 0xffff;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : &p - 
+// Output : CPrefab *
+//-----------------------------------------------------------------------------
+CPrefab * CPrefabLibrary::EnumPrefabs(POSITION &p)
+{
+	if(p == ENUM_START)
+		p = Prefabs.GetHeadPosition();
+	if(!p)
+		return NULL;
+	return Prefabs.GetNext(p);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : dwID - 
+// Output : CPrefabLibrary *
+//-----------------------------------------------------------------------------
+CPrefabLibrary * CPrefabLibrary::FindID(DWORD dwID)
+{
+	POSITION p = PrefabLibraryList.GetHeadPosition();
+	while(p)
+	{
+		CPrefabLibrary *pPrefabLibrary = PrefabLibraryList.GetNext(p);
+		if(pPrefabLibrary->dwID == dwID)
+			return pPrefabLibrary;
+	}
+
+	return NULL;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pszFilename - 
+// Output : 
+//-----------------------------------------------------------------------------
+CPrefabLibrary *CPrefabLibrary::FindOpenLibrary(LPCTSTR pszFilename)
+{
+	// checks to see if a library is open under that filename
+	POSITION p = ENUM_START;
+	CPrefabLibrary *pLibrary = EnumLibraries(p);
+	while (pLibrary != NULL)
+	{
+		if (pLibrary->IsFile(pszFilename))
+		{
+			return(pLibrary);
+		}
+		pLibrary = EnumLibraries(p);
+	}
+
+	return(NULL);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Enumerates the prefab libraries of a given type.
+// Input  : p - Iterator.
+//			eType - Type of library to return, LibType_None returns all
+//				library types.
+// Output : Returns the next library of the given type.
+//-----------------------------------------------------------------------------
+CPrefabLibrary *CPrefabLibrary::EnumLibraries(POSITION &p, LibraryType_t eType)
+{
+	if (p == ENUM_START)
+	{
+		p = PrefabLibraryList.GetHeadPosition();
+	}
+
+	while (p != NULL)
+	{
+		CPrefabLibrary *pLibrary = PrefabLibraryList.GetNext(p);
+		if ((eType == LibType_None) || pLibrary->IsType(eType))
+		{
+			return(pLibrary);
+		}
+	}
+
+	return(NULL);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CPrefabLibraryRMF::CPrefabLibraryRMF()
+{
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CPrefabLibraryRMF::~CPrefabLibraryRMF()
+{
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Returns true if this prefab represents the given filename, false if not.
+// Input  : szFilename - Path of a prefab library or folder.
+//-----------------------------------------------------------------------------
+bool CPrefabLibraryRMF::IsFile(const char *szFilename)
+{
+	return(strcmpi(m_strOpenFileName, szFilename) == 0);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pszFilename - 
+// Output : int
+//-----------------------------------------------------------------------------
+int CPrefabLibraryRMF::Load(LPCTSTR pszFilename)
+{
+	FreePrefabs();
+
+	m_eType = LibType_HalfLife;
+
+	// open file
+	m_file.open(pszFilename, std::ios::in | std::ios::binary);
+	m_strOpenFileName = pszFilename;
+	
+	if(!m_file.is_open())
+		return -1;
+
+	char szBuf[128];
+
+	// read string header
+	m_file.read(szBuf, strlen(pLibHeader));
+	if(strncmp(szBuf, pLibHeader, strlen(pLibHeader)))
+	{
+		// return
+		return -1;
+	}
+
+	// read binary header
+	PrefabLibraryHeader plh;
+	m_file.read((char*)&plh, sizeof(plh));
+	strcpy(szNotes, plh.szNotes);
+
+	// set name from filename
+	SetNameFromFilename(pszFilename);
+
+	// read directory
+	PrefabHeader *ph = new PrefabHeader[plh.dwNumEntries];
+	m_dwDirOffset = plh.dwDirOffset;
+	m_file.seekg(plh.dwDirOffset);
+	m_file.read((char*)ph, plh.dwNumEntries * sizeof(PrefabHeader));
+
+	//
+	// Read each prefab.
+	//
+	for(DWORD i = 0; i < plh.dwNumEntries; i++)
+	{
+		Assert(ph[i].iType == pt3D);
+		CPrefabRMF *pPrefab = new CPrefabRMF;
+
+		// seek to prefab
+		m_file.seekg(ph[i].dwOffset);
+		pPrefab->Init(m_file);
+
+		// set its other info frm the dir entry
+		pPrefab->SetName(ph[i].szName);
+		pPrefab->SetNotes(ph[i].szNotes);
+		pPrefab->dwFileSize = ph[i].dwSize;
+		pPrefab->dwFileOffset = ph[i].dwOffset;
+		
+		Add(pPrefab);
+	}
+
+	// delete directory
+	delete[] ph;
+
+	return 1;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Removes this prefab library from disk.
+// Output : Returns true on success, false on failure.
+//-----------------------------------------------------------------------------
+bool CPrefabLibraryRMF::DeleteFile(void)
+{
+	return(remove(m_strOpenFileName) == 0);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pszFilename - 
+//			bIndexOnly - 
+// Output : int
+//-----------------------------------------------------------------------------
+int CPrefabLibraryRMF::Save(LPCTSTR pszFilename, BOOL bIndexOnly)
+{
+	// temp storage
+	static char szFile[MAX_PATH];
+
+	// if only saving index, special code -
+	if(bIndexOnly && m_file.is_open())
+	{
+		// close file, reopen in binary write
+		m_file.close();
+		if(Prefabs.GetCount())
+		{
+			// change size of file first
+			int iHandle = _open(m_strOpenFileName, _O_BINARY | _O_WRONLY);
+			_chsize(iHandle, m_dwDirOffset);
+			_close(iHandle);
+		}
+
+		std::fstream file(m_strOpenFileName, std::ios::binary | std::ios::out);
+
+		// write string header
+		file << pLibHeader;
+		// write binary header (in case notes have changed)
+		PrefabLibraryHeader plh;
+		plh.dwNumEntries = Prefabs.GetCount();
+		plh.fVersion = fLibVersion;
+		plh.dwDirOffset = m_dwDirOffset;
+		strcpy(plh.szNotes, szNotes);
+		file.write((char*)&plh, sizeof plh);
+
+		// recreate a directory and write it
+		PrefabHeader *ph = new PrefabHeader[Prefabs.GetCount()];
+		int iCur = 0;
+
+		POSITION p = Prefabs.GetHeadPosition();
+		while(p)
+		{
+			CPrefab *pPrefab = Prefabs.GetNext(p);
+
+			// setup this dir entry
+			ph[iCur].dwOffset = pPrefab->dwFileOffset;
+			ph[iCur].dwSize = pPrefab->dwFileSize;
+			V_strcpy_safe(ph[iCur].szName, pPrefab->GetName());
+			V_strcpy_safe(ph[iCur].szNotes, pPrefab->GetNotes());
+			ph[iCur].iType = pPrefab->GetType();
+
+			++iCur;	// increase current directory entry
+		}
+
+		// write directory
+		file.seekp(m_dwDirOffset);
+		file.write((char*)ph, sizeof(*ph) * Prefabs.GetCount());
+		file.close();
+
+		// re-open
+		m_file.open(m_strOpenFileName, std::ios::in | std::ios::binary);
+		return 1;
+	}
+
+	if(pszFilename == NULL)
+	{
+		pszFilename = szFile;
+
+		if(m_strOpenFileName.IsEmpty())
+		{
+			char szNewFilename[MAX_PATH];
+			CHammer *pApp = (CHammer*) AfxGetApp();
+			pApp->GetDirectory(DIR_PREFABS, szNewFilename);
+
+			sprintf(szNewFilename + strlen(szNewFilename), "\\%s.ol", m_szName);
+
+			// make a name
+			m_strOpenFileName = szNewFilename;
+		}
+
+		strcpy(szFile, m_strOpenFileName);
+	}
+	else
+	{
+		strcpy(szFile, pszFilename);
+		SetNameFromFilename(pszFilename);
+	}
+
+	// open temp file to save to.. then delete & rename old one.
+	CString strTempFileName = "Temporary Prefab Library.$$$";
+	std::fstream file;
+	file.open(strTempFileName, std::ios::binary | std::ios::out);
+
+	// write string header
+	file << pLibHeader;
+
+	// write binary header
+	// save current position so we can seek back and rewrite it
+	DWORD dwBinaryHeaderOffset = file.tellp();
+	PrefabLibraryHeader plh;
+	plh.dwNumEntries = Prefabs.GetCount();
+	plh.fVersion = fLibVersion;
+	strcpy(plh.szNotes, szNotes);
+	file.write((char*)&plh, sizeof plh);
+
+	// allocate memory for directory
+	PrefabHeader *ph = new PrefabHeader[plh.dwNumEntries];
+	int iCur = 0;
+
+	char *pCopyBuf = new char[64000];
+
+	// write each prefab
+	POSITION p = Prefabs.GetHeadPosition();
+	while (p)
+	{
+		CPrefabRMF *pPrefab = (CPrefabRMF *)Prefabs.GetNext(p);
+
+		// setup this dir entry
+		ph[iCur].dwOffset = file.tellp();
+		V_strcpy_safe( ph[iCur].szName, pPrefab->GetName() );
+		V_strcpy_safe( ph[iCur].szNotes, pPrefab->GetNotes() );
+		ph[iCur].iType = pPrefab->GetType();
+
+		if(pPrefab->IsLoaded())
+		{
+			// it's loaded - save in native method
+			pPrefab->Save(file, CPrefab::lsUpdateFilePos);
+		}
+		else
+		{
+			// it's not loaded - save with quick method by copying
+			// bytes directly from the existing file
+			Assert(m_file.is_open());
+			m_file.seekg(pPrefab->dwFileOffset);
+			DWORD dwToRead = 64000, dwCopied = 0;
+			while(dwToRead == 64000)
+			{
+				if(dwCopied + dwToRead > pPrefab->dwFileSize)
+					dwToRead = pPrefab->dwFileSize - dwCopied;
+				m_file.read(pCopyBuf, dwToRead);
+				file.write(pCopyBuf, dwToRead);
+				dwCopied += dwToRead;
+			}
+		}
+
+		// set offset info HERE because we might use it above
+		pPrefab->dwFileOffset = ph[iCur].dwOffset;
+
+		// set size info
+		ph[iCur].dwSize = pPrefab->dwFileSize = 
+			file.tellp() - (std::streamoff)ph[iCur].dwOffset;
+
+		++iCur;	// increase current directory entry
+	}
+
+	// delete copy buf
+	delete[] pCopyBuf;
+
+	// rewrite binary header
+	plh.dwDirOffset = m_dwDirOffset = file.tellp();
+	file.seekp(dwBinaryHeaderOffset);
+	file.write((char*)&plh, sizeof(plh));
+	file.seekp(0, std::ios::end);
+
+	// write directory
+	file.write((char*)ph, sizeof(*ph) * plh.dwNumEntries);
+	file.close();	// close temp file
+	
+	// delete original and rename
+	m_file.close();	// might already be open.. might not.
+	remove(m_strOpenFileName);
+
+	m_strOpenFileName = szFile;
+	rename(strTempFileName, m_strOpenFileName);
+	
+	// reopen original
+	m_file.open(m_strOpenFileName, std::ios::in | std::ios::binary);
+
+	return 1;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: A library's name is based on its filename. We set the name here
+//			and rename the file if it exists, then re-open it.
+// Input  : pszName - 
+// Output : Returns zero on error, nonzero on success.
+//-----------------------------------------------------------------------------
+int CPrefabLibraryRMF::SetName(LPCTSTR pszName)
+{
+	// set szName
+	strcpy(m_szName, pszName);
+
+	char szNewFilename[MAX_PATH];
+	CHammer *pApp = (CHammer*) AfxGetApp();
+	pApp->GetDirectory(DIR_PREFABS, szNewFilename);
+
+	sprintf(szNewFilename + strlen(szNewFilename), "\\%s.ol", pszName);
+
+	if(m_file.is_open())
+	{
+		// close it - 
+		m_file.close();
+	}
+	else
+	{
+		// ensure destination name doesn't exist already - 
+		if(GetFileAttributes(szNewFilename) != 0xFFFFFFFF)
+			return 0;	// exists.
+	}
+
+	// rename and reopen
+	rename(m_strOpenFileName, szNewFilename);
+	m_strOpenFileName = szNewFilename;
+	m_file.open(m_strOpenFileName, std::ios::in | std::ios::binary);
+
+	return 1;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CPrefabLibraryVMF::CPrefabLibraryVMF()
+{
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CPrefabLibraryVMF::~CPrefabLibraryVMF()
+{
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Returns true if this prefab represents the given filename, false if not.
+// Input  : szFilename - Path of a prefab library or folder.
+//-----------------------------------------------------------------------------
+bool CPrefabLibraryVMF::IsFile(const char *szFilename)
+{
+	return(strcmpi(m_szFolderName, szFilename) == 0);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pszFilename - 
+// Output : int
+//-----------------------------------------------------------------------------
+int CPrefabLibraryVMF::Load(LPCTSTR pszFilename)
+{
+	FreePrefabs();
+
+	SetNameFromFilename(pszFilename);
+	strcpy(m_szFolderName, pszFilename);
+
+	m_eType = LibType_HalfLife2;
+
+	// dvs: new prefab libs have no notes! who cares?
+
+	//
+	// Read the prefabs - they are stored as individual VMF files.
+	//
+	char szDir[MAX_PATH];
+	strcpy(szDir, pszFilename);
+	strcat(szDir, "\\*.vmf");
+
+	WIN32_FIND_DATA fd;
+	HANDLE hnd = FindFirstFile(szDir, &fd);
+	if (hnd == INVALID_HANDLE_VALUE)
+	{
+		// No prefabs in this folder.
+		return(1);
+	}
+
+	*strrchr(szDir, '*') = '\0';
+
+	do
+	{
+		if (fd.cFileName[0] != '.')
+		{
+			//
+			// Build the full path to the prefab file.
+			//
+			char szFile[MAX_PATH];
+			strcpy(szFile, szDir);
+			strcat(szFile, fd.cFileName);
+
+			CPrefabVMF *pPrefab = new CPrefabVMF;
+			pPrefab->SetFilename(szFile);
+
+			Add(pPrefab);
+		}
+	} while (FindNextFile(hnd, &fd));
+
+	FindClose(hnd);
+
+	return 1;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Removes this prefab library from disk.
+// Output : Returns true on success, false on failure.
+//-----------------------------------------------------------------------------
+bool CPrefabLibraryVMF::DeleteFile(void)
+{
+	// dvs: can't remove the prefab folder yet
+	return(false);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pszFilename - 
+//			bIndexOnly - 
+// Output : int
+//-----------------------------------------------------------------------------
+int CPrefabLibraryVMF::Save(LPCTSTR pszFilename, BOOL bIndexOnly)
+{
+	return 1;
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Set's the library's name by renaming the folder.
+// Input  : pszName - 
+// Output : Returns zero on error, nonzero on success.
+//-----------------------------------------------------------------------------
+int CPrefabLibraryVMF::SetName(LPCTSTR pszName)
+{
+	// dvs: rename the folder - or maybe don't implement for VMF prefabs
+	strcpy(m_szName, pszName);
+	return 1;
+}
+
+