question: public Prototype undump ( InputStream stream , String chunkname ) throws IOException { if ( stream . read ( ) != LUA_SIGNATURE [ 0 ] || stream . read ( ) != LUA_SIGNATURE [ 1 ] || stream . read ( ) != LUA_SIGNATURE [ 2 ] || stream . read ( ) != LUA_SIGNATURE [ 3 ] ) return null ; String sname = getSourceName ( chunkname ) ; LoadState s = new LoadState ( stream , sname ) ; s . loadHeader ( ) ; switch ( s . luacNumberFormat ) { case NUMBER_FORMAT_FLOATS_OR_DOUBLES : case NUMBER_FORMAT_INTS_ONLY : case NUMBER_FORMAT_NUM_PATCH_INT32 : break ; default : throw new LuaError ( "unsupported int size" ) ; } return s . loadFunction ( LuaString . valueOf ( sname ) ) ; }
target:  Load input stream as a lua binary chunk if the first 4 bytes are the lua binary signature.