You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.5 KiB
58 lines
1.5 KiB
3 years ago
|
"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;
|