I need to insert a 2-byte number (ranging from 0 to 65,536) into a UInt8Array. For inserting a single byte number, I can easily refer to its index in the array like this:
let bufarray = new Uint8Array(buffer);
bufarray[0] = 1;
However, I am unsure of how to add a 2-byte number to a UInt8Array in Javascript/Typescript. Any guidance is appreciated.
To effectively split a two byte number into its individual bytes, bitwise shifting is required.
var originalNumber = 0xaaff;
var firstByte = ((originalNumber >> 8) & 0xff);
var secondByte = originalNumber & 0xff;
console.log(firstByte);
console.log(secondByte);
var buffer = new ArrayBuffer(2);
var Uint8View = new Uint8Array(buffer);
Uint8View[0] = firstByte;
Uint8View[1] = secondByte;
var Uint16View = new Uint16Array(buffer);
console.log(Uint16View[0]);Allow the browser to handle the task on your behalf:
let array16 = new Uint16Array([49238]);
let array8 = new Uint8Array(array16.buffer);
bufarray[0] = array8[0];
bufarray[1] = array8[1];
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