wasm debug helper functions

a.js

const mem = new Uint8Array(Module.asm.memory.buffer)

function encode(str) {
	return new TextEncoder().encode(str)
}

function decode(arr) {
	return new TextDecoder().decode(arr)
}

function indexOfArray(haystack, needle, start = 0) {
	let hLen = haystack.length
	let nLen = needle.length
	if (hLen < nLen) {
		return -1
	}
	for (let i = start; i <= hLen - nLen; i++) {
		let match = true
		for (let j = 0; j < nLen; j++) {
			if (haystack[i + j] !== needle[j]) {
				match = false
				break
			}
		}
		if (match) {
			return i
		}
	}
	return -1
}

function* findmem(mem, target) {
	let i = -1
	while (true) {
		i = indexOfArray(mem, target, i + 1)
		if (i === -1) {
			break
		}
		yield i
	}
}

function hex(n) {
	return parseInt(n).toString(16)
}