mirror of
https://github.com/janeczku/calibre-web
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Code Csmetics kthoom integration
This commit is contained in:
OzzieIsaacs
parent
5b9b36f997
commit
a159bb0b97
@ -13,341 +13,342 @@ bitjs.archive = bitjs.archive || {};
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(function() {
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// ===========================================================================
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// Stolen from Closure because it's the best way to do Java-like inheritance.
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bitjs.base = function(me, opt_methodName, var_args) {
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var caller = arguments.callee.caller;
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if (caller.superClass_) {
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// This is a constructor. Call the superclass constructor.
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return caller.superClass_.constructor.apply(
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me, Array.prototype.slice.call(arguments, 1));
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}
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// ===========================================================================
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// Stolen from Closure because it's the best way to do Java-like inheritance.
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bitjs.base = function(me, opt_methodName, var_args) {
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var caller = arguments.callee.caller;
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if (caller.superClass_) {
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// This is a constructor. Call the superclass constructor.
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return caller.superClass_.constructor.apply(
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me, Array.prototype.slice.call(arguments, 1));
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}
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var args = Array.prototype.slice.call(arguments, 2);
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var foundCaller = false;
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for (var ctor = me.constructor;
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ctor; ctor = ctor.superClass_ && ctor.superClass_.constructor) {
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if (ctor.prototype[opt_methodName] === caller) {
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foundCaller = true;
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} else if (foundCaller) {
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return ctor.prototype[opt_methodName].apply(me, args);
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}
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}
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var args = Array.prototype.slice.call(arguments, 2);
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var foundCaller = false;
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for (var ctor = me.constructor;
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ctor; ctor = ctor.superClass_ && ctor.superClass_.constructor) {
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if (ctor.prototype[opt_methodName] === caller) {
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foundCaller = true;
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} else if (foundCaller) {
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return ctor.prototype[opt_methodName].apply(me, args);
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}
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}
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// If we did not find the caller in the prototype chain,
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// then one of two things happened:
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// 1) The caller is an instance method.
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// 2) This method was not called by the right caller.
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if (me[opt_methodName] === caller) {
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return me.constructor.prototype[opt_methodName].apply(me, args);
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} else {
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throw Error(
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'goog.base called from a method of one name ' +
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'to a method of a different name');
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}
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};
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bitjs.inherits = function(childCtor, parentCtor) {
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/** @constructor */
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function tempCtor() {};
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tempCtor.prototype = parentCtor.prototype;
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childCtor.superClass_ = parentCtor.prototype;
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childCtor.prototype = new tempCtor();
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childCtor.prototype.constructor = childCtor;
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};
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// ===========================================================================
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// If we did not find the caller in the prototype chain,
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// then one of two things happened:
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// 1) The caller is an instance method.
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// 2) This method was not called by the right caller.
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if (me[opt_methodName] === caller) {
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return me.constructor.prototype[opt_methodName].apply(me, args);
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} else {
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throw Error(
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'goog.base called from a method of one name ' +
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'to a method of a different name');
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}
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};
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bitjs.inherits = function(childCtor, parentCtor) {
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/** @constructor */
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function tempCtor() {};
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tempCtor.prototype = parentCtor.prototype;
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childCtor.superClass_ = parentCtor.prototype;
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childCtor.prototype = new tempCtor();
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childCtor.prototype.constructor = childCtor;
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};
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// ===========================================================================
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/**
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* An unarchive event.
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*
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* @param {string} type The event type.
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* @constructor
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*/
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bitjs.archive.UnarchiveEvent = function(type) {
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/**
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* The event type.
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*
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* @type {string}
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*/
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this.type = type;
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};
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/**
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* The UnarchiveEvent types.
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*/
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bitjs.archive.UnarchiveEvent.Type = {
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START: 'start',
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PROGRESS: 'progress',
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EXTRACT: 'extract',
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FINISH: 'finish',
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INFO: 'info',
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ERROR: 'error'
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};
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/**
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* Useful for passing info up to the client (for debugging).
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*
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* @param {string} msg The info message.
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*/
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bitjs.archive.UnarchiveInfoEvent = function(msg) {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.INFO);
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/**
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* The information message.
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*
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* @type {string}
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*/
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this.msg = msg;
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};
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bitjs.inherits(bitjs.archive.UnarchiveInfoEvent, bitjs.archive.UnarchiveEvent);
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/**
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* An unrecoverable error has occured.
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*
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* @param {string} msg The error message.
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*/
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bitjs.archive.UnarchiveErrorEvent = function(msg) {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.ERROR);
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/**
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* The information message.
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*
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* @type {string}
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*/
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this.msg = msg;
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};
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bitjs.inherits(bitjs.archive.UnarchiveErrorEvent, bitjs.archive.UnarchiveEvent);
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/**
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* Start event.
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*
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* @param {string} msg The info message.
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*/
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bitjs.archive.UnarchiveStartEvent = function() {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.START);
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};
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bitjs.inherits(bitjs.archive.UnarchiveStartEvent, bitjs.archive.UnarchiveEvent);
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/**
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* Finish event.
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*
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* @param {string} msg The info message.
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*/
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bitjs.archive.UnarchiveFinishEvent = function() {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.FINISH);
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};
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bitjs.inherits(bitjs.archive.UnarchiveFinishEvent, bitjs.archive.UnarchiveEvent);
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/**
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* Progress event.
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*/
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bitjs.archive.UnarchiveProgressEvent = function(
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currentFilename,
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currentFileNumber,
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currentBytesUnarchivedInFile,
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currentBytesUnarchived,
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totalUncompressedBytesInArchive,
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totalFilesInArchive) {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.PROGRESS);
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this.currentFilename = currentFilename;
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this.currentFileNumber = currentFileNumber;
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this.currentBytesUnarchivedInFile = currentBytesUnarchivedInFile;
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this.totalFilesInArchive = totalFilesInArchive;
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this.currentBytesUnarchived = currentBytesUnarchived;
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this.totalUncompressedBytesInArchive = totalUncompressedBytesInArchive;
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};
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bitjs.inherits(bitjs.archive.UnarchiveProgressEvent, bitjs.archive.UnarchiveEvent);
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/**
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* All extracted files returned by an Unarchiver will implement
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* the following interface:
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*
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* interface UnarchivedFile {
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* string filename
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* TypedArray fileData
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* }
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*
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*/
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/**
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* Extract event.
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*/
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bitjs.archive.UnarchiveExtractEvent = function(unarchivedFile) {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.EXTRACT);
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/**
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* @type {UnarchivedFile}
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*/
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this.unarchivedFile = unarchivedFile;
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};
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bitjs.inherits(bitjs.archive.UnarchiveExtractEvent, bitjs.archive.UnarchiveEvent);
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/**
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* Base class for all Unarchivers.
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*
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* @param {ArrayBuffer} arrayBuffer The Array Buffer.
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* @param {string} opt_pathToBitJS Optional string for where the BitJS files are located.
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* @constructor
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*/
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bitjs.archive.Unarchiver = function(arrayBuffer, opt_pathToBitJS) {
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/**
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* The ArrayBuffer object.
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* @type {ArrayBuffer}
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* @protected
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*/
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this.ab = arrayBuffer;
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/**
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* The path to the BitJS files.
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* @type {string}
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* @private
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*/
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this.pathToBitJS_ = opt_pathToBitJS || '';
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/**
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* A map from event type to an array of listeners.
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* @type {Map.<string, Array>}
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*/
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this.listeners_ = {};
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for (var type in bitjs.archive.UnarchiveEvent.Type) {
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this.listeners_[bitjs.archive.UnarchiveEvent.Type[type]] = [];
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}
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};
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/**
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* Private web worker initialized during start().
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* @type {Worker}
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* @private
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*/
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bitjs.archive.Unarchiver.prototype.worker_ = null;
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/**
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* This method must be overridden by the subclass to return the script filename.
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* @return {string} The script filename.
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* @protected.
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*/
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bitjs.archive.Unarchiver.prototype.getScriptFileName = function() {
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throw 'Subclasses of AbstractUnarchiver must overload getScriptFileName()';
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};
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/**
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* Adds an event listener for UnarchiveEvents.
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*
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* @param {string} Event type.
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* @param {function} An event handler function.
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*/
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bitjs.archive.Unarchiver.prototype.addEventListener = function(type, listener) {
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if (type in this.listeners_) {
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if (this.listeners_[type].indexOf(listener) == -1) {
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this.listeners_[type].push(listener);
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}
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}
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};
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/**
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* Removes an event listener.
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*
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* @param {string} Event type.
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* @param {EventListener|function} An event listener or handler function.
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*/
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bitjs.archive.Unarchiver.prototype.removeEventListener = function(type, listener) {
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if (type in this.listeners_) {
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var index = this.listeners_[type].indexOf(listener);
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if (index != -1) {
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this.listeners_[type].splice(index, 1);
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}
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}
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};
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/**
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* Receive an event and pass it to the listener functions.
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*
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* @param {bitjs.archive.UnarchiveEvent} e
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* @private
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*/
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bitjs.archive.Unarchiver.prototype.handleWorkerEvent_ = function(e) {
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if ((e instanceof bitjs.archive.UnarchiveEvent || e.type) &&
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this.listeners_[e.type] instanceof Array) {
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this.listeners_[e.type].forEach(function (listener) { listener(e) });
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if (e.type == bitjs.archive.UnarchiveEvent.Type.FINISH) {
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this.worker_.terminate();
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}
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} else {
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console.log(e);
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}
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};
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/**
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* Starts the unarchive in a separate Web Worker thread and returns immediately.
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*/
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bitjs.archive.Unarchiver.prototype.start = function() {
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var me = this;
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var scriptFileName = this.pathToBitJS_ + this.getScriptFileName();
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if (scriptFileName) {
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this.worker_ = new Worker(scriptFileName);
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this.worker_.onerror = function(e) {
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console.log('Worker error: message = ' + e.message);
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throw e;
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/**
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* An unarchive event.
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*
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* @param {string} type The event type.
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* @constructor
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*/
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bitjs.archive.UnarchiveEvent = function(type) {
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/**
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* The event type.
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*
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* @type {string}
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*/
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this.type = type;
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};
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this.worker_.onmessage = function(e) {
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if (typeof e.data == 'string') {
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// Just log any strings the workers pump our way.
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console.log(e.data);
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} else {
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// Assume that it is an UnarchiveEvent. Some browsers preserve the 'type'
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// so that instanceof UnarchiveEvent returns true, but others do not.
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me.handleWorkerEvent_(e.data);
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}
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/**
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* The UnarchiveEvent types.
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*/
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bitjs.archive.UnarchiveEvent.Type = {
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START: 'start',
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PROGRESS: 'progress',
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EXTRACT: 'extract',
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FINISH: 'finish',
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INFO: 'info',
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ERROR: 'error'
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};
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this.worker_.postMessage({file: this.ab});
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}
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};
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/**
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* Useful for passing info up to the client (for debugging).
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*
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* @param {string} msg The info message.
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*/
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bitjs.archive.UnarchiveInfoEvent = function(msg) {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.INFO);
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/**
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* Terminates the Web Worker for this Unarchiver and returns immediately.
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*/
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bitjs.archive.Unarchiver.prototype.stop = function() {
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if (this.worker_) {
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this.worker_.terminate();
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}
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};
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/**
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* The information message.
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*
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* @type {string}
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*/
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this.msg = msg;
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};
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bitjs.inherits(bitjs.archive.UnarchiveInfoEvent, bitjs.archive.UnarchiveEvent);
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/**
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* An unrecoverable error has occured.
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*
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* @param {string} msg The error message.
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*/
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bitjs.archive.UnarchiveErrorEvent = function(msg) {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.ERROR);
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/**
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* The information message.
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*
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* @type {string}
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*/
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this.msg = msg;
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};
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bitjs.inherits(bitjs.archive.UnarchiveErrorEvent, bitjs.archive.UnarchiveEvent);
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/**
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* Start event.
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*
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* @param {string} msg The info message.
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*/
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bitjs.archive.UnarchiveStartEvent = function() {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.START);
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};
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bitjs.inherits(bitjs.archive.UnarchiveStartEvent, bitjs.archive.UnarchiveEvent);
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/**
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* Finish event.
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*
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* @param {string} msg The info message.
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*/
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bitjs.archive.UnarchiveFinishEvent = function() {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.FINISH);
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};
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bitjs.inherits(bitjs.archive.UnarchiveFinishEvent, bitjs.archive.UnarchiveEvent);
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/**
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* Progress event.
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*/
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bitjs.archive.UnarchiveProgressEvent = function(
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currentFilename,
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currentFileNumber,
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currentBytesUnarchivedInFile,
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currentBytesUnarchived,
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totalUncompressedBytesInArchive,
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totalFilesInArchive)
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{
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.PROGRESS);
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this.currentFilename = currentFilename;
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this.currentFileNumber = currentFileNumber;
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this.currentBytesUnarchivedInFile = currentBytesUnarchivedInFile;
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this.totalFilesInArchive = totalFilesInArchive;
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this.currentBytesUnarchived = currentBytesUnarchived;
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this.totalUncompressedBytesInArchive = totalUncompressedBytesInArchive;
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};
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bitjs.inherits(bitjs.archive.UnarchiveProgressEvent, bitjs.archive.UnarchiveEvent);
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/**
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* All extracted files returned by an Unarchiver will implement
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* the following interface:
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*
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* interface UnarchivedFile {
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* string filename
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* TypedArray fileData
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* }
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*
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*/
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/**
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* Extract event.
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*/
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bitjs.archive.UnarchiveExtractEvent = function(unarchivedFile) {
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bitjs.base(this, bitjs.archive.UnarchiveEvent.Type.EXTRACT);
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/**
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* @type {UnarchivedFile}
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*/
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this.unarchivedFile = unarchivedFile;
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};
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bitjs.inherits(bitjs.archive.UnarchiveExtractEvent, bitjs.archive.UnarchiveEvent);
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/**
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* Unzipper
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* @extends {bitjs.archive.Unarchiver}
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* @constructor
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*/
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bitjs.archive.Unzipper = function(arrayBuffer, opt_pathToBitJS) {
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bitjs.base(this, arrayBuffer, opt_pathToBitJS);
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};
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bitjs.inherits(bitjs.archive.Unzipper, bitjs.archive.Unarchiver);
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bitjs.archive.Unzipper.prototype.getScriptFileName = function() { return 'unzip.js' };
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/**
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* Base class for all Unarchivers.
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*
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* @param {ArrayBuffer} arrayBuffer The Array Buffer.
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* @param {string} opt_pathToBitJS Optional string for where the BitJS files are located.
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* @constructor
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*/
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bitjs.archive.Unarchiver = function(arrayBuffer, opt_pathToBitJS) {
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/**
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* The ArrayBuffer object.
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* @type {ArrayBuffer}
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* @protected
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*/
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this.ab = arrayBuffer;
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/**
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* Unrarrer
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* @extends {bitjs.archive.Unarchiver}
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* @constructor
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*/
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bitjs.archive.Unrarrer = function(arrayBuffer, opt_pathToBitJS) {
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bitjs.base(this, arrayBuffer, opt_pathToBitJS);
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};
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bitjs.inherits(bitjs.archive.Unrarrer, bitjs.archive.Unarchiver);
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bitjs.archive.Unrarrer.prototype.getScriptFileName = function() { return 'unrar.js' };
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/**
|
||||
* The path to the BitJS files.
|
||||
* @type {string}
|
||||
* @private
|
||||
*/
|
||||
this.pathToBitJS_ = opt_pathToBitJS || '';
|
||||
|
||||
/**
|
||||
* Untarrer
|
||||
* @extends {bitjs.archive.Unarchiver}
|
||||
* @constructor
|
||||
*/
|
||||
bitjs.archive.Untarrer = function(arrayBuffer, opt_pathToBitJS) {
|
||||
bitjs.base(this, arrayBuffer, opt_pathToBitJS);
|
||||
};
|
||||
bitjs.inherits(bitjs.archive.Untarrer, bitjs.archive.Unarchiver);
|
||||
bitjs.archive.Untarrer.prototype.getScriptFileName = function() { return 'untar.js' };
|
||||
/**
|
||||
* A map from event type to an array of listeners.
|
||||
* @type {Map.<string, Array>}
|
||||
*/
|
||||
this.listeners_ = {};
|
||||
for (var type in bitjs.archive.UnarchiveEvent.Type) {
|
||||
this.listeners_[bitjs.archive.UnarchiveEvent.Type[type]] = [];
|
||||
}
|
||||
};
|
||||
|
||||
})();
|
||||
/**
|
||||
* Private web worker initialized during start().
|
||||
* @type {Worker}
|
||||
* @private
|
||||
*/
|
||||
bitjs.archive.Unarchiver.prototype.worker_ = null;
|
||||
|
||||
/**
|
||||
* This method must be overridden by the subclass to return the script filename.
|
||||
* @return {string} The script filename.
|
||||
* @protected.
|
||||
*/
|
||||
bitjs.archive.Unarchiver.prototype.getScriptFileName = function() {
|
||||
throw 'Subclasses of AbstractUnarchiver must overload getScriptFileName()';
|
||||
};
|
||||
|
||||
/**
|
||||
* Adds an event listener for UnarchiveEvents.
|
||||
*
|
||||
* @param {string} Event type.
|
||||
* @param {function} An event handler function.
|
||||
*/
|
||||
bitjs.archive.Unarchiver.prototype.addEventListener = function(type, listener) {
|
||||
if (type in this.listeners_) {
|
||||
if (this.listeners_[type].indexOf(listener) == -1) {
|
||||
this.listeners_[type].push(listener);
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* Removes an event listener.
|
||||
*
|
||||
* @param {string} Event type.
|
||||
* @param {EventListener|function} An event listener or handler function.
|
||||
*/
|
||||
bitjs.archive.Unarchiver.prototype.removeEventListener = function(type, listener) {
|
||||
if (type in this.listeners_) {
|
||||
var index = this.listeners_[type].indexOf(listener);
|
||||
if (index != -1) {
|
||||
this.listeners_[type].splice(index, 1);
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* Receive an event and pass it to the listener functions.
|
||||
*
|
||||
* @param {bitjs.archive.UnarchiveEvent} e
|
||||
* @private
|
||||
*/
|
||||
bitjs.archive.Unarchiver.prototype.handleWorkerEvent_ = function(e) {
|
||||
if ((e instanceof bitjs.archive.UnarchiveEvent || e.type) &&
|
||||
this.listeners_[e.type] instanceof Array) {
|
||||
this.listeners_[e.type].forEach(function (listener) { listener(e) });
|
||||
if (e.type == bitjs.archive.UnarchiveEvent.Type.FINISH) {
|
||||
this.worker_.terminate();
|
||||
}
|
||||
} else {
|
||||
console.log(e);
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* Starts the unarchive in a separate Web Worker thread and returns immediately.
|
||||
*/
|
||||
bitjs.archive.Unarchiver.prototype.start = function() {
|
||||
var me = this;
|
||||
var scriptFileName = this.pathToBitJS_ + this.getScriptFileName();
|
||||
if (scriptFileName) {
|
||||
this.worker_ = new Worker(scriptFileName);
|
||||
|
||||
this.worker_.onerror = function(e) {
|
||||
console.log('Worker error: message = ' + e.message);
|
||||
throw e;
|
||||
};
|
||||
|
||||
this.worker_.onmessage = function(e) {
|
||||
if (typeof e.data == 'string') {
|
||||
// Just log any strings the workers pump our way.
|
||||
console.log(e.data);
|
||||
} else {
|
||||
// Assume that it is an UnarchiveEvent. Some browsers preserve the 'type'
|
||||
// so that instanceof UnarchiveEvent returns true, but others do not.
|
||||
me.handleWorkerEvent_(e.data);
|
||||
}
|
||||
};
|
||||
|
||||
this.worker_.postMessage({file: this.ab});
|
||||
}
|
||||
};
|
||||
|
||||
/**
|
||||
* Terminates the Web Worker for this Unarchiver and returns immediately.
|
||||
*/
|
||||
bitjs.archive.Unarchiver.prototype.stop = function() {
|
||||
if (this.worker_) {
|
||||
this.worker_.terminate();
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Unzipper
|
||||
* @extends {bitjs.archive.Unarchiver}
|
||||
* @constructor
|
||||
*/
|
||||
bitjs.archive.Unzipper = function(arrayBuffer, opt_pathToBitJS) {
|
||||
bitjs.base(this, arrayBuffer, opt_pathToBitJS);
|
||||
};
|
||||
bitjs.inherits(bitjs.archive.Unzipper, bitjs.archive.Unarchiver);
|
||||
bitjs.archive.Unzipper.prototype.getScriptFileName = function() { return 'unzip.js' };
|
||||
|
||||
/**
|
||||
* Unrarrer
|
||||
* @extends {bitjs.archive.Unarchiver}
|
||||
* @constructor
|
||||
*/
|
||||
bitjs.archive.Unrarrer = function(arrayBuffer, opt_pathToBitJS) {
|
||||
bitjs.base(this, arrayBuffer, opt_pathToBitJS);
|
||||
};
|
||||
bitjs.inherits(bitjs.archive.Unrarrer, bitjs.archive.Unarchiver);
|
||||
bitjs.archive.Unrarrer.prototype.getScriptFileName = function() { return 'unrar.js' };
|
||||
|
||||
/**
|
||||
* Untarrer
|
||||
* @extends {bitjs.archive.Unarchiver}
|
||||
* @constructor
|
||||
*/
|
||||
bitjs.archive.Untarrer = function(arrayBuffer, opt_pathToBitJS) {
|
||||
bitjs.base(this, arrayBuffer, opt_pathToBitJS);
|
||||
};
|
||||
bitjs.inherits(bitjs.archive.Untarrer, bitjs.archive.Unarchiver);
|
||||
bitjs.archive.Untarrer.prototype.getScriptFileName = function() { return 'untar.js' };
|
||||
|
||||
})();
|
||||
|
||||
@ -14,470 +14,469 @@ bitjs.io = bitjs.io || {};
|
||||
|
||||
(function() {
|
||||
|
||||
// mask for getting the Nth bit (zero-based)
|
||||
bitjs.BIT = [ 0x01, 0x02, 0x04, 0x08,
|
||||
0x10, 0x20, 0x40, 0x80,
|
||||
0x100, 0x200, 0x400, 0x800,
|
||||
0x1000, 0x2000, 0x4000, 0x8000];
|
||||
|
||||
// mask for getting N number of bits (0-8)
|
||||
var BITMASK = [0, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF ];
|
||||
|
||||
|
||||
/**
|
||||
* This bit stream peeks and consumes bits out of a binary stream.
|
||||
*
|
||||
* @param {ArrayBuffer} ab An ArrayBuffer object or a Uint8Array.
|
||||
* @param {boolean} rtl Whether the stream reads bits from the byte starting
|
||||
* from bit 7 to 0 (true) or bit 0 to 7 (false).
|
||||
* @param {Number} opt_offset The offset into the ArrayBuffer
|
||||
* @param {Number} opt_length The length of this BitStream
|
||||
*/
|
||||
bitjs.io.BitStream = function(ab, rtl, opt_offset, opt_length) {
|
||||
if (!ab || !ab.toString || ab.toString() !== "[object ArrayBuffer]") {
|
||||
throw "Error! BitArray constructed with an invalid ArrayBuffer object";
|
||||
}
|
||||
|
||||
var offset = opt_offset || 0;
|
||||
var length = opt_length || ab.byteLength;
|
||||
this.bytes = new Uint8Array(ab, offset, length);
|
||||
this.bytePtr = 0; // tracks which byte we are on
|
||||
this.bitPtr = 0; // tracks which bit we are on (can have values 0 through 7)
|
||||
this.peekBits = rtl ? this.peekBits_rtl : this.peekBits_ltr;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* byte0 byte1 byte2 byte3
|
||||
* 7......0 | 7......0 | 7......0 | 7......0
|
||||
*
|
||||
* The bit pointer starts at bit0 of byte0 and moves left until it reaches
|
||||
* bit7 of byte0, then jumps to bit0 of byte1, etc.
|
||||
* @param {number} n The number of bits to peek.
|
||||
* @param {boolean=} movePointers Whether to move the pointer, defaults false.
|
||||
* @return {number} The peeked bits, as an unsigned number.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.peekBits_ltr = function(n, movePointers) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
var movePointers = movePointers || false,
|
||||
bytePtr = this.bytePtr,
|
||||
bitPtr = this.bitPtr,
|
||||
result = 0,
|
||||
bitsIn = 0,
|
||||
bytes = this.bytes;
|
||||
|
||||
// keep going until we have no more bits left to peek at
|
||||
// TODO: Consider putting all bits from bytes we will need into a variable and then
|
||||
// shifting/masking it to just extract the bits we want.
|
||||
// This could be considerably faster when reading more than 3 or 4 bits at a time.
|
||||
while (n > 0) {
|
||||
if (bytePtr >= bytes.length) {
|
||||
throw "Error! Overflowed the bit stream! n=" + n + ", bytePtr=" + bytePtr + ", bytes.length=" +
|
||||
bytes.length + ", bitPtr=" + bitPtr;
|
||||
return -1;
|
||||
}
|
||||
|
||||
var numBitsLeftInThisByte = (8 - bitPtr);
|
||||
if (n >= numBitsLeftInThisByte) {
|
||||
var mask = (BITMASK[numBitsLeftInThisByte] << bitPtr);
|
||||
result |= (((bytes[bytePtr] & mask) >> bitPtr) << bitsIn);
|
||||
|
||||
bytePtr++;
|
||||
bitPtr = 0;
|
||||
bitsIn += numBitsLeftInThisByte;
|
||||
n -= numBitsLeftInThisByte;
|
||||
}
|
||||
else {
|
||||
var mask = (BITMASK[n] << bitPtr);
|
||||
result |= (((bytes[bytePtr] & mask) >> bitPtr) << bitsIn);
|
||||
|
||||
bitPtr += n;
|
||||
bitsIn += n;
|
||||
n = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (movePointers) {
|
||||
this.bitPtr = bitPtr;
|
||||
this.bytePtr = bytePtr;
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* byte0 byte1 byte2 byte3
|
||||
* 7......0 | 7......0 | 7......0 | 7......0
|
||||
*
|
||||
* The bit pointer starts at bit7 of byte0 and moves right until it reaches
|
||||
* bit0 of byte0, then goes to bit7 of byte1, etc.
|
||||
* @param {number} n The number of bits to peek.
|
||||
* @param {boolean=} movePointers Whether to move the pointer, defaults false.
|
||||
* @return {number} The peeked bits, as an unsigned number.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.peekBits_rtl = function(n, movePointers) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
var movePointers = movePointers || false,
|
||||
bytePtr = this.bytePtr,
|
||||
bitPtr = this.bitPtr,
|
||||
result = 0,
|
||||
bytes = this.bytes;
|
||||
|
||||
// keep going until we have no more bits left to peek at
|
||||
// TODO: Consider putting all bits from bytes we will need into a variable and then
|
||||
// shifting/masking it to just extract the bits we want.
|
||||
// This could be considerably faster when reading more than 3 or 4 bits at a time.
|
||||
while (n > 0) {
|
||||
|
||||
if (bytePtr >= bytes.length) {
|
||||
throw "Error! Overflowed the bit stream! n=" + n + ", bytePtr=" + bytePtr + ", bytes.length=" +
|
||||
bytes.length + ", bitPtr=" + bitPtr;
|
||||
return -1;
|
||||
}
|
||||
|
||||
var numBitsLeftInThisByte = (8 - bitPtr);
|
||||
if (n >= numBitsLeftInThisByte) {
|
||||
result <<= numBitsLeftInThisByte;
|
||||
result |= (BITMASK[numBitsLeftInThisByte] & bytes[bytePtr]);
|
||||
bytePtr++;
|
||||
bitPtr = 0;
|
||||
n -= numBitsLeftInThisByte;
|
||||
}
|
||||
else {
|
||||
result <<= n;
|
||||
result |= ((bytes[bytePtr] & (BITMASK[n] << (8 - n - bitPtr))) >> (8 - n - bitPtr));
|
||||
|
||||
bitPtr += n;
|
||||
n = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (movePointers) {
|
||||
this.bitPtr = bitPtr;
|
||||
this.bytePtr = bytePtr;
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Some voodoo magic.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.getBits = function() {
|
||||
return (((((this.bytes[this.bytePtr] & 0xff) << 16) +
|
||||
((this.bytes[this.bytePtr+1] & 0xff) << 8) +
|
||||
((this.bytes[this.bytePtr+2] & 0xff))) >>> (8-this.bitPtr)) & 0xffff);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Reads n bits out of the stream, consuming them (moving the bit pointer).
|
||||
* @param {number} n The number of bits to read.
|
||||
* @return {number} The read bits, as an unsigned number.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.readBits = function(n) {
|
||||
return this.peekBits(n, true);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* This returns n bytes as a sub-array, advancing the pointer if movePointers
|
||||
* is true. Only use this for uncompressed blocks as this throws away remaining
|
||||
* bits in the current byte.
|
||||
* @param {number} n The number of bytes to peek.
|
||||
* @param {boolean=} movePointers Whether to move the pointer, defaults false.
|
||||
* @return {Uint8Array} The subarray.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.peekBytes = function(n, movePointers) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
// from http://tools.ietf.org/html/rfc1951#page-11
|
||||
// "Any bits of input up to the next byte boundary are ignored."
|
||||
while (this.bitPtr != 0) {
|
||||
this.readBits(1);
|
||||
}
|
||||
|
||||
var movePointers = movePointers || false;
|
||||
var bytePtr = this.bytePtr,
|
||||
bitPtr = this.bitPtr;
|
||||
|
||||
var result = this.bytes.subarray(bytePtr, bytePtr + n);
|
||||
|
||||
if (movePointers) {
|
||||
this.bytePtr += n;
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {Uint8Array} The subarray.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.readBytes = function(n) {
|
||||
return this.peekBytes(n, true);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* This object allows you to peek and consume bytes as numbers and strings
|
||||
* out of an ArrayBuffer. In this buffer, everything must be byte-aligned.
|
||||
*
|
||||
* @param {ArrayBuffer} ab The ArrayBuffer object.
|
||||
* @param {number=} opt_offset The offset into the ArrayBuffer
|
||||
* @param {number=} opt_length The length of this BitStream
|
||||
* @constructor
|
||||
*/
|
||||
bitjs.io.ByteStream = function(ab, opt_offset, opt_length) {
|
||||
var offset = opt_offset || 0;
|
||||
var length = opt_length || ab.byteLength;
|
||||
this.bytes = new Uint8Array(ab, offset, length);
|
||||
this.ptr = 0;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Peeks at the next n bytes as an unsigned number but does not advance the
|
||||
* pointer
|
||||
* TODO: This apparently cannot read more than 4 bytes as a number?
|
||||
* @param {number} n The number of bytes to peek at.
|
||||
* @return {number} The n bytes interpreted as an unsigned number.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.peekNumber = function(n) {
|
||||
// TODO: return error if n would go past the end of the stream?
|
||||
if (n <= 0 || typeof n != typeof 1)
|
||||
return -1;
|
||||
|
||||
var result = 0;
|
||||
// read from last byte to first byte and roll them in
|
||||
var curByte = this.ptr + n - 1;
|
||||
while (curByte >= this.ptr) {
|
||||
result <<= 8;
|
||||
result |= this.bytes[curByte];
|
||||
--curByte;
|
||||
}
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Returns the next n bytes as an unsigned number (or -1 on error)
|
||||
* and advances the stream pointer n bytes.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {number} The n bytes interpreted as an unsigned number.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.readNumber = function(n) {
|
||||
var num = this.peekNumber( n );
|
||||
this.ptr += n;
|
||||
return num;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Returns the next n bytes as a signed number but does not advance the
|
||||
* pointer.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {number} The bytes interpreted as a signed number.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.peekSignedNumber = function(n) {
|
||||
var num = this.peekNumber(n);
|
||||
var HALF = Math.pow(2, (n * 8) - 1);
|
||||
var FULL = HALF * 2;
|
||||
|
||||
if (num >= HALF) num -= FULL;
|
||||
|
||||
return num;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Returns the next n bytes as a signed number and advances the stream pointer.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {number} The bytes interpreted as a signed number.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.readSignedNumber = function(n) {
|
||||
var num = this.peekSignedNumber(n);
|
||||
this.ptr += n;
|
||||
return num;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* This returns n bytes as a sub-array, advancing the pointer if movePointers
|
||||
* is true.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @param {boolean} movePointers Whether to move the pointers.
|
||||
* @return {Uint8Array} The subarray.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.peekBytes = function(n, movePointers) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return null;
|
||||
}
|
||||
|
||||
var result = this.bytes.subarray(this.ptr, this.ptr + n);
|
||||
|
||||
if (movePointers) {
|
||||
this.ptr += n;
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Reads the next n bytes as a sub-array.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {Uint8Array} The subarray.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.readBytes = function(n) {
|
||||
return this.peekBytes(n, true);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Peeks at the next n bytes as a string but does not advance the pointer.
|
||||
* @param {number} n The number of bytes to peek at.
|
||||
* @return {string} The next n bytes as a string.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.peekString = function(n) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return "";
|
||||
}
|
||||
|
||||
var result = "";
|
||||
for (var p = this.ptr, end = this.ptr + n; p < end; ++p) {
|
||||
result += String.fromCharCode(this.bytes[p]);
|
||||
}
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Returns the next n bytes as an ASCII string and advances the stream pointer
|
||||
* n bytes.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {string} The next n bytes as a string.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.readString = function(n) {
|
||||
var strToReturn = this.peekString(n);
|
||||
this.ptr += n;
|
||||
return strToReturn;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* A write-only Byte buffer which uses a Uint8 Typed Array as a backing store.
|
||||
* @param {number} numBytes The number of bytes to allocate.
|
||||
* @constructor
|
||||
*/
|
||||
bitjs.io.ByteBuffer = function(numBytes) {
|
||||
if (typeof numBytes != typeof 1 || numBytes <= 0) {
|
||||
throw "Error! ByteBuffer initialized with '" + numBytes + "'";
|
||||
}
|
||||
this.data = new Uint8Array(numBytes);
|
||||
this.ptr = 0;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {number} b The byte to insert.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.insertByte = function(b) {
|
||||
// TODO: throw if byte is invalid?
|
||||
this.data[this.ptr++] = b;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {Array.<number>|Uint8Array|Int8Array} bytes The bytes to insert.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.insertBytes = function(bytes) {
|
||||
// TODO: throw if bytes is invalid?
|
||||
this.data.set(bytes, this.ptr);
|
||||
this.ptr += bytes.length;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Writes an unsigned number into the next n bytes. If the number is too large
|
||||
* to fit into n bytes or is negative, an error is thrown.
|
||||
* @param {number} num The unsigned number to write.
|
||||
* @param {number} numBytes The number of bytes to write the number into.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.writeNumber = function(num, numBytes) {
|
||||
if (numBytes < 1) {
|
||||
throw 'Trying to write into too few bytes: ' + numBytes;
|
||||
}
|
||||
if (num < 0) {
|
||||
throw 'Trying to write a negative number (' + num +
|
||||
') as an unsigned number to an ArrayBuffer';
|
||||
}
|
||||
if (num > (Math.pow(2, numBytes * 8) - 1)) {
|
||||
throw 'Trying to write ' + num + ' into only ' + numBytes + ' bytes';
|
||||
}
|
||||
|
||||
// Roll 8-bits at a time into an array of bytes.
|
||||
var bytes = [];
|
||||
while (numBytes-- > 0) {
|
||||
var eightBits = num & 255;
|
||||
bytes.push(eightBits);
|
||||
num >>= 8;
|
||||
}
|
||||
|
||||
this.insertBytes(bytes);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Writes a signed number into the next n bytes. If the number is too large
|
||||
* to fit into n bytes, an error is thrown.
|
||||
* @param {number} num The signed number to write.
|
||||
* @param {number} numBytes The number of bytes to write the number into.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.writeSignedNumber = function(num, numBytes) {
|
||||
if (numBytes < 1) {
|
||||
throw 'Trying to write into too few bytes: ' + numBytes;
|
||||
}
|
||||
|
||||
var HALF = Math.pow(2, (numBytes * 8) - 1);
|
||||
if (num >= HALF || num < -HALF) {
|
||||
throw 'Trying to write ' + num + ' into only ' + numBytes + ' bytes';
|
||||
}
|
||||
|
||||
// Roll 8-bits at a time into an array of bytes.
|
||||
var bytes = [];
|
||||
while (numBytes-- > 0) {
|
||||
var eightBits = num & 255;
|
||||
bytes.push(eightBits);
|
||||
num >>= 8;
|
||||
}
|
||||
|
||||
this.insertBytes(bytes);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {string} str The ASCII string to write.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.writeASCIIString = function(str) {
|
||||
for (var i = 0; i < str.length; ++i) {
|
||||
var curByte = str.charCodeAt(i);
|
||||
if (curByte < 0 || curByte > 255) {
|
||||
throw 'Trying to write a non-ASCII string!';
|
||||
}
|
||||
this.insertByte(curByte);
|
||||
}
|
||||
};
|
||||
|
||||
// mask for getting the Nth bit (zero-based)
|
||||
bitjs.BIT = [ 0x01, 0x02, 0x04, 0x08,
|
||||
0x10, 0x20, 0x40, 0x80,
|
||||
0x100, 0x200, 0x400, 0x800,
|
||||
0x1000, 0x2000, 0x4000, 0x8000];
|
||||
|
||||
// mask for getting N number of bits (0-8)
|
||||
var BITMASK = [0, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF ];
|
||||
|
||||
|
||||
/**
|
||||
* This bit stream peeks and consumes bits out of a binary stream.
|
||||
*
|
||||
* @param {ArrayBuffer} ab An ArrayBuffer object or a Uint8Array.
|
||||
* @param {boolean} rtl Whether the stream reads bits from the byte starting
|
||||
* from bit 7 to 0 (true) or bit 0 to 7 (false).
|
||||
* @param {Number} opt_offset The offset into the ArrayBuffer
|
||||
* @param {Number} opt_length The length of this BitStream
|
||||
*/
|
||||
bitjs.io.BitStream = function(ab, rtl, opt_offset, opt_length) {
|
||||
if (!ab || !ab.toString || ab.toString() !== "[object ArrayBuffer]") {
|
||||
throw "Error! BitArray constructed with an invalid ArrayBuffer object";
|
||||
}
|
||||
|
||||
var offset = opt_offset || 0;
|
||||
var length = opt_length || ab.byteLength;
|
||||
this.bytes = new Uint8Array(ab, offset, length);
|
||||
this.bytePtr = 0; // tracks which byte we are on
|
||||
this.bitPtr = 0; // tracks which bit we are on (can have values 0 through 7)
|
||||
this.peekBits = rtl ? this.peekBits_rtl : this.peekBits_ltr;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* byte0 byte1 byte2 byte3
|
||||
* 7......0 | 7......0 | 7......0 | 7......0
|
||||
*
|
||||
* The bit pointer starts at bit0 of byte0 and moves left until it reaches
|
||||
* bit7 of byte0, then jumps to bit0 of byte1, etc.
|
||||
* @param {number} n The number of bits to peek.
|
||||
* @param {boolean=} movePointers Whether to move the pointer, defaults false.
|
||||
* @return {number} The peeked bits, as an unsigned number.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.peekBits_ltr = function(n, movePointers) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
var movePointers = movePointers || false,
|
||||
bytePtr = this.bytePtr,
|
||||
bitPtr = this.bitPtr,
|
||||
result = 0,
|
||||
bitsIn = 0,
|
||||
bytes = this.bytes;
|
||||
|
||||
// keep going until we have no more bits left to peek at
|
||||
// TODO: Consider putting all bits from bytes we will need into a variable and then
|
||||
// shifting/masking it to just extract the bits we want.
|
||||
// This could be considerably faster when reading more than 3 or 4 bits at a time.
|
||||
while (n > 0) {
|
||||
if (bytePtr >= bytes.length) {
|
||||
throw "Error! Overflowed the bit stream! n=" + n + ", bytePtr=" + bytePtr + ", bytes.length=" +
|
||||
bytes.length + ", bitPtr=" + bitPtr;
|
||||
return -1;
|
||||
}
|
||||
|
||||
var numBitsLeftInThisByte = (8 - bitPtr);
|
||||
if (n >= numBitsLeftInThisByte) {
|
||||
var mask = (BITMASK[numBitsLeftInThisByte] << bitPtr);
|
||||
result |= (((bytes[bytePtr] & mask) >> bitPtr) << bitsIn);
|
||||
|
||||
bytePtr++;
|
||||
bitPtr = 0;
|
||||
bitsIn += numBitsLeftInThisByte;
|
||||
n -= numBitsLeftInThisByte;
|
||||
}
|
||||
else {
|
||||
var mask = (BITMASK[n] << bitPtr);
|
||||
result |= (((bytes[bytePtr] & mask) >> bitPtr) << bitsIn);
|
||||
|
||||
bitPtr += n;
|
||||
bitsIn += n;
|
||||
n = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (movePointers) {
|
||||
this.bitPtr = bitPtr;
|
||||
this.bytePtr = bytePtr;
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* byte0 byte1 byte2 byte3
|
||||
* 7......0 | 7......0 | 7......0 | 7......0
|
||||
*
|
||||
* The bit pointer starts at bit7 of byte0 and moves right until it reaches
|
||||
* bit0 of byte0, then goes to bit7 of byte1, etc.
|
||||
* @param {number} n The number of bits to peek.
|
||||
* @param {boolean=} movePointers Whether to move the pointer, defaults false.
|
||||
* @return {number} The peeked bits, as an unsigned number.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.peekBits_rtl = function(n, movePointers) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
var movePointers = movePointers || false,
|
||||
bytePtr = this.bytePtr,
|
||||
bitPtr = this.bitPtr,
|
||||
result = 0,
|
||||
bytes = this.bytes;
|
||||
|
||||
// keep going until we have no more bits left to peek at
|
||||
// TODO: Consider putting all bits from bytes we will need into a variable and then
|
||||
// shifting/masking it to just extract the bits we want.
|
||||
// This could be considerably faster when reading more than 3 or 4 bits at a time.
|
||||
while (n > 0) {
|
||||
|
||||
if (bytePtr >= bytes.length) {
|
||||
throw "Error! Overflowed the bit stream! n=" + n + ", bytePtr=" + bytePtr + ", bytes.length=" +
|
||||
bytes.length + ", bitPtr=" + bitPtr;
|
||||
return -1;
|
||||
}
|
||||
|
||||
var numBitsLeftInThisByte = (8 - bitPtr);
|
||||
if (n >= numBitsLeftInThisByte) {
|
||||
result <<= numBitsLeftInThisByte;
|
||||
result |= (BITMASK[numBitsLeftInThisByte] & bytes[bytePtr]);
|
||||
bytePtr++;
|
||||
bitPtr = 0;
|
||||
n -= numBitsLeftInThisByte;
|
||||
}
|
||||
else {
|
||||
result <<= n;
|
||||
result |= ((bytes[bytePtr] & (BITMASK[n] << (8 - n - bitPtr))) >> (8 - n - bitPtr));
|
||||
|
||||
bitPtr += n;
|
||||
n = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (movePointers) {
|
||||
this.bitPtr = bitPtr;
|
||||
this.bytePtr = bytePtr;
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Some voodoo magic.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.getBits = function() {
|
||||
return (((((this.bytes[this.bytePtr] & 0xff) << 16) +
|
||||
((this.bytes[this.bytePtr+1] & 0xff) << 8) +
|
||||
((this.bytes[this.bytePtr+2] & 0xff))) >>> (8-this.bitPtr)) & 0xffff);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Reads n bits out of the stream, consuming them (moving the bit pointer).
|
||||
* @param {number} n The number of bits to read.
|
||||
* @return {number} The read bits, as an unsigned number.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.readBits = function(n) {
|
||||
return this.peekBits(n, true);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* This returns n bytes as a sub-array, advancing the pointer if movePointers
|
||||
* is true. Only use this for uncompressed blocks as this throws away remaining
|
||||
* bits in the current byte.
|
||||
* @param {number} n The number of bytes to peek.
|
||||
* @param {boolean=} movePointers Whether to move the pointer, defaults false.
|
||||
* @return {Uint8Array} The subarray.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.peekBytes = function(n, movePointers) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
// from http://tools.ietf.org/html/rfc1951#page-11
|
||||
// "Any bits of input up to the next byte boundary are ignored."
|
||||
while (this.bitPtr != 0) {
|
||||
this.readBits(1);
|
||||
}
|
||||
|
||||
var movePointers = movePointers || false;
|
||||
var bytePtr = this.bytePtr,
|
||||
bitPtr = this.bitPtr;
|
||||
|
||||
var result = this.bytes.subarray(bytePtr, bytePtr + n);
|
||||
|
||||
if (movePointers) {
|
||||
this.bytePtr += n;
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {Uint8Array} The subarray.
|
||||
*/
|
||||
bitjs.io.BitStream.prototype.readBytes = function(n) {
|
||||
return this.peekBytes(n, true);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* This object allows you to peek and consume bytes as numbers and strings
|
||||
* out of an ArrayBuffer. In this buffer, everything must be byte-aligned.
|
||||
*
|
||||
* @param {ArrayBuffer} ab The ArrayBuffer object.
|
||||
* @param {number=} opt_offset The offset into the ArrayBuffer
|
||||
* @param {number=} opt_length The length of this BitStream
|
||||
* @constructor
|
||||
*/
|
||||
bitjs.io.ByteStream = function(ab, opt_offset, opt_length) {
|
||||
var offset = opt_offset || 0;
|
||||
var length = opt_length || ab.byteLength;
|
||||
this.bytes = new Uint8Array(ab, offset, length);
|
||||
this.ptr = 0;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Peeks at the next n bytes as an unsigned number but does not advance the
|
||||
* pointer
|
||||
* TODO: This apparently cannot read more than 4 bytes as a number?
|
||||
* @param {number} n The number of bytes to peek at.
|
||||
* @return {number} The n bytes interpreted as an unsigned number.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.peekNumber = function(n) {
|
||||
// TODO: return error if n would go past the end of the stream?
|
||||
if (n <= 0 || typeof n != typeof 1)
|
||||
return -1;
|
||||
|
||||
var result = 0;
|
||||
// read from last byte to first byte and roll them in
|
||||
var curByte = this.ptr + n - 1;
|
||||
while (curByte >= this.ptr) {
|
||||
result <<= 8;
|
||||
result |= this.bytes[curByte];
|
||||
--curByte;
|
||||
}
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Returns the next n bytes as an unsigned number (or -1 on error)
|
||||
* and advances the stream pointer n bytes.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {number} The n bytes interpreted as an unsigned number.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.readNumber = function(n) {
|
||||
var num = this.peekNumber( n );
|
||||
this.ptr += n;
|
||||
return num;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Returns the next n bytes as a signed number but does not advance the
|
||||
* pointer.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {number} The bytes interpreted as a signed number.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.peekSignedNumber = function(n) {
|
||||
var num = this.peekNumber(n);
|
||||
var HALF = Math.pow(2, (n * 8) - 1);
|
||||
var FULL = HALF * 2;
|
||||
|
||||
if (num >= HALF) num -= FULL;
|
||||
|
||||
return num;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Returns the next n bytes as a signed number and advances the stream pointer.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {number} The bytes interpreted as a signed number.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.readSignedNumber = function(n) {
|
||||
var num = this.peekSignedNumber(n);
|
||||
this.ptr += n;
|
||||
return num;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* This returns n bytes as a sub-array, advancing the pointer if movePointers
|
||||
* is true.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @param {boolean} movePointers Whether to move the pointers.
|
||||
* @return {Uint8Array} The subarray.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.peekBytes = function(n, movePointers) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return null;
|
||||
}
|
||||
|
||||
var result = this.bytes.subarray(this.ptr, this.ptr + n);
|
||||
|
||||
if (movePointers) {
|
||||
this.ptr += n;
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Reads the next n bytes as a sub-array.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {Uint8Array} The subarray.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.readBytes = function(n) {
|
||||
return this.peekBytes(n, true);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Peeks at the next n bytes as a string but does not advance the pointer.
|
||||
* @param {number} n The number of bytes to peek at.
|
||||
* @return {string} The next n bytes as a string.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.peekString = function(n) {
|
||||
if (n <= 0 || typeof n != typeof 1) {
|
||||
return "";
|
||||
}
|
||||
|
||||
var result = "";
|
||||
for (var p = this.ptr, end = this.ptr + n; p < end; ++p) {
|
||||
result += String.fromCharCode(this.bytes[p]);
|
||||
}
|
||||
return result;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Returns the next n bytes as an ASCII string and advances the stream pointer
|
||||
* n bytes.
|
||||
* @param {number} n The number of bytes to read.
|
||||
* @return {string} The next n bytes as a string.
|
||||
*/
|
||||
bitjs.io.ByteStream.prototype.readString = function(n) {
|
||||
var strToReturn = this.peekString(n);
|
||||
this.ptr += n;
|
||||
return strToReturn;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* A write-only Byte buffer which uses a Uint8 Typed Array as a backing store.
|
||||
* @param {number} numBytes The number of bytes to allocate.
|
||||
* @constructor
|
||||
*/
|
||||
bitjs.io.ByteBuffer = function(numBytes) {
|
||||
if (typeof numBytes != typeof 1 || numBytes <= 0) {
|
||||
throw "Error! ByteBuffer initialized with '" + numBytes + "'";
|
||||
}
|
||||
this.data = new Uint8Array(numBytes);
|
||||
this.ptr = 0;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {number} b The byte to insert.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.insertByte = function(b) {
|
||||
// TODO: throw if byte is invalid?
|
||||
this.data[this.ptr++] = b;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {Array.<number>|Uint8Array|Int8Array} bytes The bytes to insert.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.insertBytes = function(bytes) {
|
||||
// TODO: throw if bytes is invalid?
|
||||
this.data.set(bytes, this.ptr);
|
||||
this.ptr += bytes.length;
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Writes an unsigned number into the next n bytes. If the number is too large
|
||||
* to fit into n bytes or is negative, an error is thrown.
|
||||
* @param {number} num The unsigned number to write.
|
||||
* @param {number} numBytes The number of bytes to write the number into.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.writeNumber = function(num, numBytes) {
|
||||
if (numBytes < 1) {
|
||||
throw 'Trying to write into too few bytes: ' + numBytes;
|
||||
}
|
||||
if (num < 0) {
|
||||
throw 'Trying to write a negative number (' + num +
|
||||
') as an unsigned number to an ArrayBuffer';
|
||||
}
|
||||
if (num > (Math.pow(2, numBytes * 8) - 1)) {
|
||||
throw 'Trying to write ' + num + ' into only ' + numBytes + ' bytes';
|
||||
}
|
||||
|
||||
// Roll 8-bits at a time into an array of bytes.
|
||||
var bytes = [];
|
||||
while (numBytes-- > 0) {
|
||||
var eightBits = num & 255;
|
||||
bytes.push(eightBits);
|
||||
num >>= 8;
|
||||
}
|
||||
|
||||
this.insertBytes(bytes);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* Writes a signed number into the next n bytes. If the number is too large
|
||||
* to fit into n bytes, an error is thrown.
|
||||
* @param {number} num The signed number to write.
|
||||
* @param {number} numBytes The number of bytes to write the number into.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.writeSignedNumber = function(num, numBytes) {
|
||||
if (numBytes < 1) {
|
||||
throw 'Trying to write into too few bytes: ' + numBytes;
|
||||
}
|
||||
|
||||
var HALF = Math.pow(2, (numBytes * 8) - 1);
|
||||
if (num >= HALF || num < -HALF) {
|
||||
throw 'Trying to write ' + num + ' into only ' + numBytes + ' bytes';
|
||||
}
|
||||
|
||||
// Roll 8-bits at a time into an array of bytes.
|
||||
var bytes = [];
|
||||
while (numBytes-- > 0) {
|
||||
var eightBits = num & 255;
|
||||
bytes.push(eightBits);
|
||||
num >>= 8;
|
||||
}
|
||||
|
||||
this.insertBytes(bytes);
|
||||
};
|
||||
|
||||
|
||||
/**
|
||||
* @param {string} str The ASCII string to write.
|
||||
*/
|
||||
bitjs.io.ByteBuffer.prototype.writeASCIIString = function(str) {
|
||||
for (var i = 0; i < str.length; ++i) {
|
||||
var curByte = str.charCodeAt(i);
|
||||
if (curByte < 0 || curByte > 255) {
|
||||
throw 'Trying to write a non-ASCII string!';
|
||||
}
|
||||
this.insertByte(curByte);
|
||||
}
|
||||
};
|
||||
})();
|
||||
|
||||
File diff suppressed because it is too large
Load Diff
Loading…
Reference in New Issue
Block a user