Method LoadFromFile

mp/src/tier1/KeyValues.cpp:633–667

----------------------------------------------------------------------------- Purpose: Load keyValues from disk -----------------------------------------------------------------------------

// Purpose: Load keyValues from disk
//-----------------------------------------------------------------------------
bool KeyValues::LoadFromFile( IBaseFileSystem *filesystem, const char *resourceName, const char *pathID )
{
	Assert(filesystem);
#ifdef WIN32
	Assert( IsX360() || ( IsPC() && _heapchk() == _HEAPOK ) );
#endif
	FileHandle_t f = filesystem->Open(resourceName, "rb", pathID);
	if ( !f )
		return false;

	s_LastFileLoadingFrom = (char*)resourceName;

	// load file into a null-terminated buffer
	int fileSize = filesystem->Size( f );
	unsigned bufSize = ((IFileSystem *)filesystem)->GetOptimalReadSize( f, fileSize + 2 );

	char *buffer = (char*)((IFileSystem *)filesystem)->AllocOptimalReadBuffer( f, bufSize );
	Assert( buffer );
	
	// read into local buffer
	bool bRetOK = ( ((IFileSystem *)filesystem)->ReadEx( buffer, bufSize, fileSize, f ) != 0 );

	filesystem->Close( f );	// close file after reading

	if ( bRetOK )
	{
		buffer[fileSize] = 0; // null terminate file as EOF
		buffer[fileSize+1] = 0; // double NULL terminating in case this is a unicode file
		bRetOK = LoadFromBuffer( resourceName, buffer, filesystem );
	}

	((IFileSystem *)filesystem)->FreeOptimalReadBuffer( buffer );

	return bRetOK;
}

//-----------------------------------------------------------------------------
// Purpose: Save the keyvalues to disk