Method OpenForReading

neo/framework/DemoFile.cpp:85–127

================ idDemoFile::OpenForReading ================ */

================
*/
bool idDemoFile::OpenForReading( const char *fileName ) {
	static const int magicLen = sizeof(DEMO_MAGIC) / sizeof(DEMO_MAGIC[0]);
	char magicBuffer[magicLen];
	int compression;
	int fileLength;

	Close();

	f = fileSystem->OpenFileRead( fileName );
	if ( !f ) {
		return false;
	}

	fileLength = f->Length();

	if ( com_preloadDemos.GetBool() ) {
		fileImage = (byte *)Mem_Alloc( fileLength );
		f->Read( fileImage, fileLength );
		fileSystem->CloseFile( f );
		f = new idFile_Memory( va( "preloaded(%s)", fileName ), (const char *)fileImage, fileLength );
	}

	if ( com_logDemos.GetBool() ) {
		fLog = fileSystem->OpenFileWrite( "demoread.log" );
	}

	writing = false;

	f->Read(magicBuffer, magicLen);
	if ( memcmp(magicBuffer, DEMO_MAGIC, magicLen) == 0 ) {
		f->ReadInt( compression );
	} else {
		// Ideally we would error out if the magic string isn't there,
		// but for backwards compatibility we are going to assume it's just an uncompressed demo file
		compression = 0;
		f->Rewind();
	}

	compressor = AllocCompressor( compression );
	compressor->Init( f, false, 8 );

	return true;
}

/*
================