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Viewing file:     ArrayReader.js (1.55 KB)      -rw-r--r--

"use strict";
var DataReader = require("./DataReader");
var utils = require("../utils");

function ArrayReader(data) {
    DataReader.call(this, data);
    for(var i = 0; i < this.data.length; i++) {
        data[i] = data[i] & 0xFF;
    }
}
utils.inherits(ArrayReader, DataReader);
/**
 * @see DataReader.byteAt
 */
ArrayReader.prototype.byteAt = function(i) {
    return this.data[this.zero + i];
};
/**
 * @see DataReader.lastIndexOfSignature
 */
ArrayReader.prototype.lastIndexOfSignature = function(sig) {
    var sig0 = sig.charCodeAt(0),
        sig1 = sig.charCodeAt(1),
        sig2 = sig.charCodeAt(2),
        sig3 = sig.charCodeAt(3);
    for (var 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.readAndCheckSignature
 */
ArrayReader.prototype.readAndCheckSignature = function (sig) {
    var sig0 = sig.charCodeAt(0),
        sig1 = sig.charCodeAt(1),
        sig2 = sig.charCodeAt(2),
        sig3 = sig.charCodeAt(3),
        data = this.readData(4);
    return sig0 === data[0] && sig1 === data[1] && sig2 === data[2] && sig3 === data[3];
};
/**
 * @see DataReader.readData
 */
ArrayReader.prototype.readData = function(size) {
    this.checkOffset(size);
    if(size === 0) {
        return [];
    }
    var result = this.data.slice(this.zero + this.index, this.zero + this.index + size);
    this.index += size;
    return result;
};
module.exports = ArrayReader;