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'use strict';
var DataReader = require('./dataReader');
function Uint8ArrayReader(data) {
if (data) {
this.data = data;
this.length = this.data.length;
this.index = 0;
}
}
Uint8ArrayReader.prototype = new DataReader();
/**
* @see DataReader.byteAt
*/
Uint8ArrayReader.prototype.byteAt = function(i) {
return this.data[i];
};
/**
* @see DataReader.lastIndexOfSignature
*/
Uint8ArrayReader.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;
}
}
return -1;
};
/**
* @see DataReader.readData
*/
Uint8ArrayReader.prototype.readData = function(size) {
this.checkOffset(size);
if(size === 0) {
// in IE10, when using subarray(idx, idx), we get the array [0x00] instead of [].
return new Uint8Array(0);
}
var result = this.data.subarray(this.index, this.index + size);
this.index += size;
return result;
};
module.exports = Uint8ArrayReader;
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