Optimized version of fromArray

[webysther]

• Support to set the length;
• Performance issue for big files (if in for).

[timkurvers]

Thanks for the contribution! Most definitely see the performance benefits for big arrays.

Just out of curiosity, the following snippet wouldn't cover your partial byte-array usage?

var b:ByteArray = new ByteArray();
...
b.length = 100;
Hex.fromArray(b);

[webysther]

You is correct, i apply the correction just for the if inside loop.