Re: Convert Bytes from byte[] to data types

Maybe you can use this for inspiration... https://gist.github.com/ibaca/d8c14e19bf8f96bbe1b4b7f1291b6b24#file-dtachoviewer-java-L99 we used this to read binary files and decode in the client side. We transform the field in a byte[], after that converting to strings (new String(b, "ISO-8859-1")) or ints are trivial. You can do something as simple as int x = byte[0]; or are more advanced like.

public static long convertIntoUnsigned4ByteInt(byte[] b) {
   long l = 0;

   long al = ( ( (long)b[ 0 ] ) & 0xff ) << 24 ;
   long bl = ( ( (long)b[ 1 ] ) & 0xff ) << 16 ;
   long cl = ( ( (long)b[ 2 ] ) & 0xff ) << 8 ;

   int di =  ( b[ 3 ] & 0xff );
   long dl = ( (long)di ) << 0;

   l = al +  bl + cl + dl;

   return l;
}

All this just work. I have a file drag&drop example here https://github.com/ibaca/dndfiles-gwt. Not sure if useful, but is the original point of the other example (gist). Transforming it to a byte[] is not very performant (byte are emulated in gwt), but is easier and our library already exists and use byte[] everywhere. 

On Sunday, May 29, 2016 at 7:15:21 PM UTC+2, Jens wrote:

Never done it but I would say so. GWT supports new String(byte[]) with UTF-8, LATIN-1, ISO_8859_1 charsets. For numbers you probably have to use BigInteger or do the conversion yourself as GWT does not emulate ByteBuffer.wrap(..).get...() for now.

-- J.

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