if(c>0xffff){i++;} // skip surrogate

function utf82str(arr){

	let res=[];

	for(let i=0;i<arr.length;i++){

		let x=arr[i];

		if(x<=0b1111111){res.push(x);}

		else if(x<=0b11011111){

			let a=x&0b11111;

			let b=arr[++i]&0b111111;

			res.push(a<<6|b);

		}

		else if(x<=0b11101111){

			let a=x&0b1111;

			let b=arr[++i]&0b111111;

			let c=arr[++i]&0b111111;

			res.push(a<<12|b<<6|c);

		}

		else{

			let a=x&0b111;

			let b=arr[++i]&0b111111;

			let c=arr[++i]&0b111111;

			let d=arr[++i]&0b111111;

			res.push(a<<18|b<<12|c<<6|d);

		}

	}

	return res.map(x=>String.fromCodePoint(x)).join("");

}

if(typeof module!=='undefined'&&module.hasOwnProperty('exports')){

	module.exports.bytes2int32=bytes2int32;

	module.exports.bytes2int32s=bytes2int32s;

	module.exports.int322bytes=int322bytes;

	module.exports.int32s2bytes=int32s2bytes;

	module.exports.bytes2hex=bytes2hex;

	module.exports.str2utf8=str2utf8;

	module.exports.utf82str=utf82str;

}