"use strict";
const DataReader = require("./dataReader.js");

function ArrayReader(data) {
	if (data) {
		this.data = data;
		this.length = this.data.length;
		this.index = 0;
		this.zero = 0;

		for (let i = 0; i < this.data.length; i++) {
			data[i] &= data[i];
		}
	}
}
ArrayReader.prototype = new DataReader();
/**
 * @see DataReader.byteAt
 */
ArrayReader.prototype.byteAt = function (i) {
	return this.data[this.zero + i];
};
/**
 * @see DataReader.lastIndexOfSignature
 */
ArrayReader.prototype.lastIndexOfSignature = function (sig) {
	const sig0 = sig.charCodeAt(0),
		sig1 = sig.charCodeAt(1),
		sig2 = sig.charCodeAt(2),
		sig3 = sig.charCodeAt(3);
	for (let i = this.length - 4; i >= 0; --i) {
		if (
			this.data[i] === sig0 &&
			this.data[i + 1] === sig1 &&
			this.data[i + 2] === sig2 &&
			this.data[i + 3] === sig3
		) {
			return i - this.zero;
		}
	}

	return -1;
};
/**
 * @see DataReader.readData
 */
ArrayReader.prototype.readData = function (size) {
	this.checkOffset(size);
	if (size === 0) {
		return [];
	}
	const result = this.data.slice(
		this.zero + this.index,
		this.zero + this.index + size
	);
	this.index += size;
	return result;
};
module.exports = ArrayReader;