1. start check 2. legal check 3. error correction (e.g. Hamming Code)

[todo]

vis-steg/src/stegLSB/writeLSB.ts

Lines 3 to 8 in c95fcc2

	// TODO: 1. start check 2. legal check 3. error correction (e.g. Hamming Code)
	export function writeLSB(imgBitmapData: Array<number>, secretInfo: string): Array<number> {
	function unSetBit(k: number) {
	return k % 2 == 1 ? (Math.max(k - 1, 0)) : k;
	}
	function setBit(k: number) {

---

This issue was generated by todo based on a TODO comment in c95fcc2 when #1 was merged. cc @antvis.