107 lines
2.9 KiB
JavaScript
107 lines
2.9 KiB
JavaScript
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"use strict";
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var Class = require("../utils/class");
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var ByteArray = Class.inherit({
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"className": "ByteArray",
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"constructor": function(size) {
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Class.fn.constructor.call(this);
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this._referenceMode = false;
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this._data = new Uint8Array(size);
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this._shiftBegin = 0;
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this._shiftEnd = 0;
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},
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"_checkReference": function() {
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if (this._referenceMode) {
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var buffer = new ArrayBuffer(this._data.length - this._shiftBegin);
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var newData = new Uint8Array(buffer);
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newData.set(this._data, this._shiftBegin);
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this._data = newData;
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this._shiftBegin = 0;
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this._referenceMode = false;
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}
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},
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"fill": function(/*Uint8Array*/arr, /*Number*/size, /*[Number]*/shift) {
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this._checkReference();
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shift = shift || 0;
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if (this._shiftEnd === 0 && (this._data.length <= size - shift)) {
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this._referenceMode = true;
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this._data = arr.subarray(shift, this._data.length + shift);
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this._shiftEnd = this._data.length;
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shift += this._shiftEnd;
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} else {
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while (!this.filled() && shift < size) {
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this._data[this._shiftEnd] = arr[shift];
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++shift;
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++this._shiftEnd;
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}
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}
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return shift;
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},
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"filled": function() {
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return this._data.length === this._shiftEnd;
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},
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"size": function() {
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return this._shiftEnd - this._shiftBegin;
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},
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"maxSize": function() {
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return this._data.length;
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},
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"push8": function(int) {
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this._checkReference();
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this._data[this._shiftEnd] = int;
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++this._shiftEnd;
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},
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"push16": function(int) {
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var h = (int >> 8) & 0xff;
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var l = int & 0xff;
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this.push8(h);
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this.push8(l);
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},
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"push32": function(int) {
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var hh = (int >> 24) & 0xff;
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var hl = (int >> 16) & 0xff;
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var lh = (int >> 8) & 0xff;
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var ll = int & 0xff;
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this.push8(hh);
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this.push8(hl);
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this.push8(lh);
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this.push8(ll);
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},
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"push64": function(int) {
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},
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"pop8": function(int) {
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var ret = this._data[this._shiftBegin];
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++this._shiftBegin;
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return ret;
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},
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"pop16": function(int) {
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var ret = (this.pop8() << 8);
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ret = ret | this.pop8();
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return ret;
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},
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"pop32": function(int) {
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var ret = this.pop8() << 24;
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ret = ret | (this.pop8() << 16);
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ret = ret | (this.pop8() << 8);
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ret = ret | this.pop8();
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return ret;
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},
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"pop64": function(int) {
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},
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"data": function() {
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return this._data.subarray(this._shiftBegin, this._shiftEnd);
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}
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});
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module.exports = ByteArray;
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