question: protected static void writeQuotedStringValue ( ByteArrayOutputStream out , byte [ ] buf ) { int len = buf . length ; byte ch ; for ( int i = 0 ; i < len ; i ++ ) { ch = buf [ i ] ; if ( needEscape ( ( char ) ch ) ) { out . write ( '\\' ) ; } out . write ( ch ) ; } }
target:  Checks if a byte[] contains characters that must be quoted and write the resulting, possibly escaped, characters to out.