reading bytes without offset

[majimboo]

I want to read bytes in LE order

// coordinates data (walk)
// 100c 70e3 76ba 73c3
// 100c 92e3 af8a 1266
// 100c b1e3 d34b c2b8
// 100c d0e3 6168 aec3

// set to LE
buf.order(true)

var w = buf.readUint32(0)
var x = buf.readUint32()
var y = buf.readUint32()
var z = buf.readUint32()

The docs says:

Offset to read from. Will use and increase ByteBuffer#offset by 4 if omitted.

So why am I getting the error:

RangeError: Illegal offset: 0 <= 8 (+4) <= 11

---

Oh should be readUint16() but how to make it read LE?

[dcodeIO]

Assuming that buf has been filled and properly flipped

var w = buf.readUint32() // also no offset
var x = buf.readUint32()
var y = buf.readUint32()
var z = buf.readUint32()

will read one Uint32 after another (relative). This is equal to (absolute):

var w = buf.readUint32(0)
var x = buf.readUint32(4)
var y = buf.readUint32(8)
var z = buf.readUint32(12)
buf.offset = 16;

Regarding byte order: Once set to LE, all operations following will use LE until you set it to BE again.

buf.LE();
...
...
...
buf.BE();

[majimboo]

Yea, I realized. Got it solved. Except I don't get why I should properly FLIP it? What is the implications of flip? I didn't use flip but I'm getting proper results.

Thanks though, this is great :)

[dcodeIO]

If you just wrap some data, flipping is not necessary. It is, though, if you fill the buffer successively just like you read it in the example above:

var buf = new ByteBuffer(6); // initializes with offset = 0, limit = 6
buf.writeUint32(123); // afterwards: offset = 4, limit = 6
buf.flip(); // afterwards: limit = offset = 4, offset = 0, ready for read operations
...

See