question: public static byte [ ] combine ( final List < byte [ ] > dataChunks ) { int totalSize = 0 ; for ( final byte [ ] dataPart : dataChunks ) { totalSize += dataPart . length ; } final byte [ ] data = new byte [ totalSize ] ; int index = 0 ; for ( final byte [ ] dataPart : dataChunks ) { System . arraycopy ( dataPart , 0 , data , index , dataPart . length ) ; index += dataPart . length ; } return data ; }
target:  Combines a list of byte arrays into one big byte array.