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amf.js
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amf.js
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/***
* AMF JavaScript library by Emil Malinov https://github.com/emilkm/amfjs
*/
amf = {
clients: {},
classes: {},
const: {
CLASS_ALIAS : "_explicitType",
EXTERNALIZED_FIELD : "_externalizedData",
RESULT_METHOD : "/onResult",
STATUS_METHOD : "/onStatus",
EMPTY_STRING : "",
NULL_STRING : "null",
AMF0_OBJECT_ENCODING : 0,
AMF0_NUMBER : 0,
AMF0_BOOLEAN : 1,
AMF0_STRING : 2,
AMF0_OBJECT : 3,
AMF0_MOVIECLIP : 4,
AMF0_NULL : 5,
AMF0_UNDEFINED : 6,
AMF0_REFERENCE : 7,
AMF0_MIXEDARRAY : 8, //ECMAArray
AMF0_OBJECTEND : 9,
AMF0_ARRAY : 10, //StrictArray
AMF0_DATE : 11,
AMF0_LONGSTRING : 12,
AMF0_UNSUPPORTED : 13,
AMF0_RECORDSET : 14,
AMF0_XMLDOCUMENT : 15,
AMF0_TYPEDOBJECT : 16,
AMF0_AMF3 : 17,
AMF3_OBJECT_ENCODING : 3,
AMF3_UNDEFINED : 0,
AMF3_NULL : 1,
AMF3_BOOLEAN_FALSE : 2,
AMF3_BOOLEAN_TRUE : 3,
AMF3_INTEGER : 4,
AMF3_DOUBLE : 5,
AMF3_STRING : 6,
AMF3_XMLDOCUMENT : 7,
AMF3_DATE : 8,
AMF3_ARRAY : 9,
AMF3_OBJECT : 10,
AMF3_XML : 11,
AMF3_BYTEARRAY : 12,
AMF3_VECTOR_INT : 13,
AMF3_VECTOR_UINT : 14,
AMF3_VECTOR_DOUBLE : 15,
AMF3_VECTOR_OBJECT : 16,
AMF3_DICTIONARY : 17,
UNKNOWN_CONTENT_LENGTH : 1,
UINT29_MASK : 536870911,
INT28_MAX_VALUE : 268435455,
INT28_MIN_VALUE : -268435456,
UINT_MAX_VALUE : 4294967295,
UINT_MIN_VALUE : 0,
MAX_STORED_OBJECTS : 1024,
POW_2_20 : Math.pow(2, 20),
POW_2_52 : Math.pow(2, 52),
POW_2_52N : Math.pow(2, -52)
},
bind: function(functor, object) {
return function() {
return functor.apply(object, arguments);
};
},
registerClass: function(name, clazz) {
this.classes[name] = clazz;
},
ActionMessage: function() {
return {
_explicitType: "flex.messaging.io.amf.ActionMessage",
version: 3,
headers: [],
bodies: []
};
},
MessageBody: function() {
return {
//this._explicitType = "flex.messaging.io.amf.MessageBody";
targetURI: "null",
responseURI: "/1",
data: []
};
},
MessageHeader: function() {
return {
//this._explicitType = "flex.messaging.io.amf.MessageHeader";
name: "",
mustUnderstand: false,
data: null
};
},
CommandMessage: function() {
return {
_explicitType: "flex.messaging.messages.CommandMessage",
destination: "",
operation: 5,
body: [],
headers: {DSId: "nil"},
clientId: null
};
},
RemotingMessage: function() {
return {
_explicitType: "flex.messaging.messages.RemotingMessage",
destination: "",
source: "",
operation: "",
body: [],
headers: {DSId: "nil"},
clientId: null
};
},
AcknowledgeMessage: function() {
return {
_explicitType: "flex.messaging.messages.AcknowledgeMessage",
body: null,
headers: [],
messageId: null,
clientId: null
}
},
Request: function(source, operation, params) {
return {
source: source,
operation: operation,
params: params
}
},
getClient: function(destination) {
return this.clients[destination];
}
};
amf.Response = function(code, message, detail, data, scope) {
this.code = code;
this.message = message;
this.detail = detail;
this.data = data;
this.$scope = scope;
};
amf.Client = function(destination, endpoint, timeout) {
this.xhrPoolSize = 6;
this.xhrPool = [];
this.dnf = new Function;
this.clientId = null;
this.sessionId = null;
this.sequence = 0;
this.headers = null;
this.requestQueue = [];
this.queueBlocked = false;
this.pingFailed = false;
this.destination = destination;
this.endpoint = endpoint;
this.requestTimeout = timeout ? timeout : 30000; //30 seconds
this.sidPropagation = "header";
amf.clients[destination] = this;
};
amf.Client.prototype.addHeader = function(name, value) {
var header = {};
header[name] = value;
if (this.headers === null) {
this.headers = [];
}
this.headers.push(header);
};
amf.Client.prototype.pingFailure = function(err) {
this.pingFailed = true;
for (var i in this.requestQueue) {
this.requestQueue[i].reject(new amf.Response(-1000, "Could not connect to the server.", "Could not reach AMF endpoint."));
}
};
amf.Client.prototype.setSessionId = function(value) {
this.sessionId = value;
if (this.sidPropagation == "header") {
this.addHeader("sID", this.sessionId);
} else {
this.endpoint += "?sID=" + this.sessionId;
}
};
amf.Client.prototype.releaseQueue = function() {
this.queueBlocked = false;
this._processQueue();
};
amf.Client.prototype.invoke = function(source, operation, params, block, nobatch) {
var promise = this._deffer(new amf.Request(source, operation, params));
if (this.pingFailed) {
promise.reject(new amf.Response(-1000, "Could not connect to the server.", "Could not reach AMF endpoint."));
return promise;
}
if (block) {
promise.$blocking = true;
} else if (nobatch) {
promise.$nobatch = true;
}
if (this.clientId == null && this.sequence == 0 && this.requestQueue.length == 0) {
var ping = this._deffer(new amf.Request("command", "ping", null));
ping.fail(amf.bind(this.pingFailure, this));
this.requestQueue.push(ping);
this.requestQueue.push(promise);
this._startQueue();
return promise;
}
this.requestQueue.push(promise);
if (this.clientId == null) {
return promise;
}
this._startQueue();
return promise;
};
amf.Client.prototype._deffer = function(request) {
var pr = amf.promise.defer();
pr.request = request;
pr.$context = this;
return pr;
};
amf.Client.prototype._createPacket = function() {
var actionMessage = new amf.ActionMessage();
var messageBody, message, promise, promises = [];
if (this.sequence == 0) {
this.sequence++;
promise = this.requestQueue.shift();
promise.$sequence = this.sequence;
promises.push(promise);
messageBody = new amf.MessageBody();
messageBody.responseURI = "/" + this.sequence;
message = new amf.CommandMessage();
message.destination = this.destination;
messageBody.data.push(message);
actionMessage.bodies.push(messageBody);
} else {
while (this.requestQueue.length > 0) {
if (!this.requestQueue[0].$blocking && this.requestQueue[0].$nobatch && actionMessage.bodies.length > 0) {
break;
}
this.sequence++;
promise = this.requestQueue.shift();
promise.$sequence = this.sequence;
promises.push(promise);
messageBody = new amf.MessageBody();
messageBody.responseURI = "/" + this.sequence;
message = new amf.RemotingMessage();
message.destination = this.destination;
message.source = promise.request.source;
message.operation = promise.request.operation;
message.body = promise.request.params;
message.messageId = amf.uuid(0, 0);
message.headers["DSId"] = this.clientId;
message.clientId = this.clientId;
if (Object.prototype.toString.call(this.headers) === "[object Array]") {
for (var i = 0; i < this.headers.length; i++) {
var header = this.headers[i];
for (var headerName in header) {
message.headers[headerName] = header[headerName];
}
}
}
messageBody.data.push(message);
actionMessage.bodies.push(messageBody);
if (promise.$blocking) {
this.queueBlocked = true;
break;
} else if (promise.$nobatch) {
break;
}
}
}
return {"message": actionMessage, "promises": promises};
};
amf.Client.prototype._startQueue = function() {
setTimeout(amf.bind(this._processQueue, this), 1);
};
amf.Client.prototype._processQueue = function() {
var i, xhr;
if ((this.sequence == 1 && this.clientId == null) || this.queueBlocked) {
return;
}
for (i = 0; i < this.xhrPoolSize && this.requestQueue.length > 0; i++) {
if (this.xhrPool.length == i) {
xhr = {
obj: new XMLHttpRequest(),
busy: false,
parent: this,
message: null,
promises: null
};
if (this.xhrPoolSize > 1) {
this.xhrPool.push(xhr);
}
} else {
xhr = this.xhrPool[i];
}
if (!xhr.busy) {
var packet = this._createPacket();
this._send(xhr, packet);
if (this.sequence == 1 || this.queueBlocked) {
return;
}
}
}
};
amf.Client.prototype._send = function(xhr, packet) {
var i, serializer = new amf.Serializer();
try {
xhr.message = serializer.writeMessage(packet.message);
xhr.promises = packet.promises;
} catch (e) {
for (i in this.promises) {
this.promises[i].reject(new amf.Response(-1001, "Failed encoding the request.", null));
}
xhr.busy = false;
xhr.message = null;
xhr.promises = null;
this._processQueue();
return;
}
xhr.obj.open("POST", this.endpoint, true);
if (!xhr.busy) {
xhr.busy = true;
xhr.obj.setRequestHeader("Content-Type", "application/x-amf; charset=UTF-8");
xhr.obj.responseType = "arraybuffer";
xhr.obj.send(new Uint8Array(xhr.message));
};
xhr.obj.onload = e => {
xhr.obj.onload = null;
try {
if (xhr.obj.status >= 200 && xhr.obj.status <= 300
&& xhr.obj.responseType == "arraybuffer"
&& xhr.obj.getResponseHeader("Content-type").indexOf("application/x-amf") > -1
) {
var message, body, deserializer = new amf.Deserializer(new Uint8Array(xhr.obj.response));
try {
message = deserializer.readMessage();
} catch (e) {
for (i in xhr.promises) {
xhr.promises[i].reject(new amf.Response(-1001, "Failed decoding the response.", null));
}
xhr.busy = false;
xhr.message = null;
xhr.promises = null;
this._processQueue();
return;
}
for (i in message.bodies) {
body = message.bodies[i];
if (body.targetURI && body.targetURI.indexOf("/onResult") > -1) {
if (body.targetURI == "/1/onResult") {
this.clientId = body.data.clientId;
xhr.promises[i].resolve(new amf.Response(0, "", null, null));
} else {
if (body.data._explicitType == "flex.messaging.messages.AcknowledgeMessage" && body.data.body._explicitType == "AMFResult") {
xhr.promises[i].resolve(new amf.Response(body.data.body.code, body.data.body.message, body.data.body.detail, body.data.body.data));
} else if (body.data.body.hasOwnProperty("code") && body.data.body.hasOwnProperty("data")) {
xhr.promises[i].resolve(new amf.Response(body.data.body.code, "", null, body.data.body));
} else if (body.data.body.hasOwnProperty("data")) {
xhr.promises[i].resolve(new amf.Response(0, "", null, body.data.body.data));
} else {
xhr.promises[i].reject(new amf.Response(-1002, "Unknown result message.", body.data));
}
}
} else {
if (body.data._explicitType == "flex.messaging.messages.ErrorMessage") {
xhr.promises[i].reject(new amf.Response(body.data.faultCode, body.data.faultString, body.data.faultDetail));
} else {
xhr.promises[i].reject(new amf.Response(-1003, "Unknown error message.", body.data));
}
}
}
} else if (xhr.obj.status == 0 || xhr.obj.responseType == "text") {
for (i in xhr.promises) {
xhr.promises[i].reject(new amf.Response(-1004, "Invalid response type.", "Invalid XMLHttpRequest response status or type."));
}
} else {
for (i in xhr.promises) {
xhr.promises[i].reject(new amf.Response(-1005, "Invalid response.", ""));
}
}
} catch (e) {
for (i in xhr.promises) {
xhr.promises[i].reject(new amf.Response(-1006, "Unknown error.", e.message));
}
}
xhr.busy = false;
xhr.message = null;
xhr.promises = null;
this._processQueue();
};
xhr.obj.onerror = e => {
xhr.obj.onerror = null;
for (i in xhr.promises) {
this.promises[i].reject(new amf.Response(-1006, e.message, e.message));
}
xhr.busy = false;
xhr.message = null;
xhr.promises = null;
this._processQueue();
};
};
amf.Writer = function() {
this.data = [];
this.objects = [];
this.traits = {};
this.strings = {};
this.stringCount = 0;
this.traitCount = 0;
this.objectCount = 0;
};
amf.Writer.prototype.write = function(v) {
this.data.push(v);
};
amf.Writer.prototype.writeShort = function(v) {
this.write((v >>> 8) & 255);
this.write((v >>> 0) & 255);
};
amf.Writer.prototype.writeUTF = function(v, asAmf) {
var bytearr = [];
var strlen = v.length;
var utflen = 0;
for (var i = 0; i < strlen; i++) {
var c1 = v.charCodeAt(i);
//var enc = null;
if (c1 < 128) {
utflen++;
bytearr.push(c1);
//end++;
} else if (c1 > 127 && c1 < 2048) {
utflen += 2;
bytearr.push(192 | (c1 >> 6));
if (asAmf) {
bytearr.push(128 | ((c1 >> 0) & 63));
} else {
bytearr.push(128 | (c1 & 63));
}
} else if ((c1 & 0xF800) !== 0xD800) {
utflen += 3;
bytearr.push(224 | (c1 >> 12));
bytearr.push(128 | ((c1 >> 6) & 63));
if (asAmf) {
bytearr.push(128 | ((c1 >> 0) & 63));
} else {
bytearr.push(128 | (c1 & 63));
}
} else {
utflen += 4;
if ((c1 & 0xFC00) !== 0xD800) {
throw new RangeError('Unmatched trail surrogate at ' + i);
}
var c2 = v.charCodeAt(++i);
if ((c2 & 0xFC00) !== 0xDC00) {
throw new RangeError('Unmatched lead surrogate at ' + (i - 1));
}
c1 = ((c1 & 0x3FF) << 10) + (c2 & 0x3FF) + 0x10000;
bytearr.push(240 | (c1 >> 18));
bytearr.push(128 | ((c1 >> 12) & 63));
bytearr.push((c1 >> 6) & 63);
if (asAmf) {
bytearr.push(128 | ((c1 >> 0) & 63));
} else {
bytearr.push(128 | (c1 & 63));
}
}
}
if (asAmf) {
this.writeUInt29((utflen << 1) | 1);
} else {
bytearr.unshift(utflen & 255);
bytearr.unshift((utflen >>> 8) & 255);
}
this.writeAll(bytearr);
return asAmf ? utflen : utflen + 2;
};
amf.Writer.prototype.writeUInt29 = function(v) {
if (v < 128) {
this.write(v);
} else if (v < 16384) {
this.write(((v >> 7) & 127) | 128);
this.write(v & 127);
} else if (v < 2097152) {
this.write(((v >> 14) & 127) | 128);
this.write(((v >> 7) & 127) | 128);
this.write(v & 127);
} else if (v < 0x40000000) {
this.write(((v >> 22) & 127) | 128);
this.write(((v >> 15) & 127) | 128);
this.write(((v >> 8) & 127) | 128);
this.write(v & 255);
} else {
throw "Integer out of range: " + v;
}
};
amf.Writer.prototype.writeAll = function(bytes) {
for (var i = 0; i < bytes.length; i++) {
this.write(bytes[i]);
}
};
amf.Writer.prototype.writeBoolean = function(v) {
this.write(v ? 1 : 0);
};
amf.Writer.prototype.writeInt = function(v) {
this.write((v >>> 24) & 255);
this.write((v >>> 16) & 255);
this.write((v >>> 8) & 255);
this.write((v >>> 0) & 255);
};
amf.Writer.prototype.writeUInt32 = function(v) {
v < 0 && (v = -(v ^ amf.const.UINT_MAX_VALUE) - 1);
v &= amf.const.UINT_MAX_VALUE;
this.write((v >>> 24) & 255);
this.write((v >>> 16) & 255);
this.write((v >>> 8) & 255);
this.write((v & 255));
};
amf.Writer.prototype._getDouble = function(v) {
var r = [0,0];
if (v != v) {
return r[0] = -524288, r;
}
var d = v < 0 || v === 0 && 1 / v < 0 ? -2147483648 : 0, v = Math.abs(v);
if (v === Number.POSITIVE_INFINITY) {
return r[0] = d | 2146435072, r;
}
for (var e = 0; v >= 2 && e <= 1023;) {
e++, v /= 2;
}
for (; v < 1 && e >= -1022;) {
e--, v *= 2;
}
e += 1023;
if (e == 2047) {
return r[0] = d | 2146435072, r;
}
var i;
e == 0
? (i = v * Math.pow(2, 23) / 2, v = Math.round(v * amf.const.POW_2_52 / 2))
: (i = v * amf.const.POW_2_20 - amf.const.POW_2_20, v = Math.round(v * amf.const.POW_2_52 - amf.const.POW_2_52));
r[0] = d | e << 20 & 2147418112 | i & 1048575;
r[1] = v;
return r;
};
amf.Writer.prototype.writeDouble = function(v) {
v = this._getDouble(v);
this.writeUInt32(v[0]);
this.writeUInt32(v[1]);
};
amf.Writer.prototype.getResult = function() {
return this.data.join("");
};
amf.Writer.prototype.reset = function() {
this.objects = [];
this.objectCount = 0;
this.traits = {};
this.traitCount = 0;
this.strings = {};
this.stringCount = 0;
};
amf.Writer.prototype.writeStringWithoutType = function(v) {
if (v.length == 0) {
this.writeUInt29(1);
} else {
if (!this.stringByReference(v)) {
this.writeUTF(v, true);
}
}
};
amf.Writer.prototype.stringByReference = function(v) {
var ref = this.strings[v];
if (ref) {
this.writeUInt29(ref << 1);
} else {
this.strings[v] = this.stringCount++;
}
return ref;
};
amf.Writer.prototype.objectByReference = function(v) {
var ref = 0;
var found = false;
for (; ref < this.objects.length; ref++) {
if (this.objects[ref] === v) {
found = true;
break;
}
}
if (found) {
this.writeUInt29(ref << 1);
} else {
this.objects.push(v);
this.objectCount++;
}
return found ? ref : null;
};
amf.Writer.prototype.traitsByReference = function(v, alias) {
var s = alias + "|";
for ( var i = 0; i < v.length; i++) {
s += v[i] + "|";
}
var ref = this.traits[s];
if (ref) {
this.writeUInt29((ref << 2) | 1);
} else {
this.traits[s] = this.traitCount++;
}
return ref;
};
amf.Writer.prototype.writeAmfInt = function(v) {
if (v >= amf.const.INT28_MIN_VALUE && v <= amf.const.INT28_MAX_VALUE) {
v = v & amf.const.UINT29_MASK;
this.write(amf.const.AMF3_INTEGER);
this.writeUInt29(v);
} else {
this.write(amf.const.AMF3_DOUBLE);
this.writeDouble(v);
}
};
amf.Writer.prototype.writeDate = function(v) {
this.write(amf.const.AMF3_DATE);
if (!this.objectByReference(v)) {
this.writeUInt29(1);
this.writeDouble(v.getTime());
}
};
amf.Writer.prototype.writeObject = function(v) {
if (v == null) {
this.write(amf.const.AMF3_NULL);
return;
}
if (v.constructor === String) {
this.write(amf.const.AMF3_STRING);
this.writeStringWithoutType(v);
} else if (v.constructor === Number) {
if (v === +v && v === (v | 0)) {
this.writeAmfInt(v);
} else {
this.write(amf.const.AMF3_DOUBLE);
this.writeDouble(v);
}
} else if (v.constructor === Boolean) {
this.write((v
? amf.const.AMF3_BOOLEAN_TRUE
: amf.const.AMF3_BOOLEAN_FALSE));
} else if (v.constructor === Date) {
this.writeDate(v);
} else {
if (v.constructor === Array) {
if (v.toString().indexOf("[Vector") == 0) {
this.writeVector(v);
} else {
this.writeArray(v);
}
} else if (amf.const.CLASS_ALIAS in v) {
this.writeCustomObject(v);
} else {
this.writeMap(v);
}
}
};
amf.Writer.prototype.writeCustomObject = function(v) {
this.write(amf.const.AMF3_OBJECT);
if (!this.objectByReference(v)) {
var traits = this.writeTraits(v);
for (var i = 0; i < traits.length; i++) {
var prop = traits[i];
this.writeObject(v[prop]);
}
}
};
amf.Writer.prototype.writeTraits = function(v) {
var traits = [];
var count = 0;
var externalizable = false;
var dynamic = false;
for (var t in v) {
if (t != amf.const.CLASS_ALIAS) {
traits.push(t);
count++;
}
}
if (!this.traitsByReference(traits, v[amf.const.CLASS_ALIAS])) {
this.writeUInt29(3 | (externalizable ? 4 : 0) | (dynamic ? 8 : 0) | (count << 4));
this.writeStringWithoutType(v[amf.const.CLASS_ALIAS]);
if (count > 0) {
for (var prop in traits) {
this.writeStringWithoutType(traits[prop]);
}
}
}
return traits;
};
/* Write map as array
amf.Writer.prototype.writeMap = function(v) {
this.write(amf.const.AMF3_ARRAY);
if (!this.objectByReference(map)) {
this.writeUInt29((0 << 1) | 1);
for (var key in v) {
if (key) {
this.writeStringWithoutType(key);
} else {
this.writeStringWithoutType(amf.const.EMPTY_STRING);
}
this.writeObject(v[key]);
}
this.writeStringWithoutType(amf.const.EMPTY_STRING);
}
};*/
amf.Writer.prototype.writeMap = function(v) {
this.write(amf.const.AMF3_OBJECT);
if (!this.objectByReference(v)) {
this.writeUInt29(11);
this.traitCount++; //bogus traits entry here
this.writeStringWithoutType(amf.const.EMPTY_STRING); //class name
for (var key in v) {
if (key) {
this.writeStringWithoutType(key);
} else {
this.writeStringWithoutType(amf.const.EMPTY_STRING);
}
this.writeObject(v[key]);
}
this.writeStringWithoutType(amf.const.EMPTY_STRING); //empty string end of dynamic members
}
};
amf.Writer.prototype.writeArray = function(v) {
this.write(amf.const.AMF3_ARRAY);
var len = v.length;
if (!this.objectByReference(v)) {
this.writeUInt29((len << 1) | 1);
this.writeUInt29(1); //empty string implying no named keys
if (len > 0) {
for (var i = 0; i < len; i++) {
this.writeObject(v[i]);
}
}
}
};
amf.Writer.prototype.writeVector = function(v) {
this.write(v.type);
var i, len = v.length;
if (!this.objectByReference(v)) {
this.writeUInt29((len << 1) | 1);
this.writeBoolean(v.fixed);
}
if (v.type == amf.const.AMF3_VECTOR_OBJECT) {
var className = "";
if (len > 0) {
// TODO: how much of the PHP logic can we do here
className = v[0].constructor.name;
}
this.writeStringWithoutType(className);
for (i = 0; i < len; i++) {
this.writeObject(v[i]);
}
} else if (v.type == amf.const.AMF3_VECTOR_INT) {
for (i = 0; i < len; i++) {
this.writeInt(v[i]);
}
} else if (v.type == amf.const.AMF3_VECTOR_UINT) {
for (i = 0; i < len; i++) {
this.writeUInt32(v[i]);
}
} else if (v.type == amf.const.AMF3_VECTOR_DOUBLE) {
for (i = 0; i < len; i++) {
this.writeDouble(v[i]);
}
}
};
amf.Reader = function(data) {
this.objects = [];
this.traits = [];
this.strings = [];
this.data = data;
this.pos = 0;
};
amf.Reader.prototype.read = function() {
//if (this.pos + 1 > this.datalen) { //this.data.length store in this.datalen
// throw "Cannot read past the end of the data.";
//}
return this.data[this.pos++];
};
amf.Reader.prototype.readUIntN = function(n) {
var value = this.read();
for (var i = 1; i < n; i++) {
value = (value << 8) | this.read();
}
return value;
};
amf.Reader.prototype.readUnsignedShort = function() {
var c1 = this.read(), c2 = this.read();
return ((c1 << 8) + (c2 << 0));
};
amf.Reader.prototype.readInt = function() {
var c1 = this.read(), c2 = this.read(), c3 = this.read(), c4 = this.read();
return ((c1 << 24) + (c2 << 16) + (c3 << 8) + (c4 << 0));
};
amf.Reader.prototype.readUInt32 = function() {
var c1 = this.read(), c2 = this.read(), c3 = this.read(), c4 = this.read();
return (c1 * 0x1000000) + ((c2 << 16) | (c3 << 8) | c4);
};
amf.Reader.prototype.readUInt29 = function() {
var b = this.read() & 255;
if (b < 128) {
return b;
}
var value = (b & 127) << 7;
b = this.read() & 255;
if (b < 128) {
return (value | b);
}
value = (value | (b & 127)) << 7;
b = this.read() & 255;
if (b < 128) {
return (value | b);
}
value = (value | (b & 127)) << 8;
b = this.read() & 255;
return (value | b);
};
amf.Reader.prototype.readFully = function(buff, start, length) {
for (var i = start; i < length; i++) {
buff[i] = this.read();
}
};
amf.Reader.prototype.readUTF = function(length) {
var utflen = length ? length : this.readUnsignedShort();
var len = this.pos + utflen;
var chararr = [];
var c1 = 0;
var seqlen = 0;
while (this.pos < len) {
c1 = this.read() & 0xFF;
seqlen = 0;
if (c1 <= 0xBF) {
c1 = c1 & 0x7F;
seqlen = 1;
} else if (c1 <= 0xDF) {
c1 = c1 & 0x1F;
seqlen = 2;
} else if (c1 <= 0xEF) {
c1 = c1 & 0x0F;
seqlen = 3;
} else {
c1 = c1 & 0x07;
seqlen = 4;
}
for (var i = 1; i < seqlen; ++i) {
c1 = c1 << 0x06 | this.read() & 0x3F;
}
if (seqlen === 4) {
c1 -= 0x10000;
chararr.push(String.fromCharCode(0xD800 | c1 >> 10 & 0x3FF));
chararr.push(String.fromCharCode(0xDC00 | c1 & 0x3FF));
} else {
chararr.push(String.fromCharCode(c1));
}
}
return chararr.join("");
};
amf.Reader.prototype.reset = function() {
this.objects = [];
this.traits = [];
this.strings = [];
};
amf.Reader.prototype.readObject = function() {
var type = this.read();
return this.readObjectValue(type);
};
amf.Reader.prototype.readString = function() {
var ref = this.readUInt29();
if ((ref & 1) == 0) {
return this.getString(ref >> 1);
} else {
var len = (ref >> 1);
if (len == 0) {
return amf.const.EMPTY_STRING;
}
var str = this.readUTF(len);
this.rememberString(str);
return str;
}
};
amf.Reader.prototype.rememberString = function(v) {
this.strings.push(v);
};
amf.Reader.prototype.getString = function(v) {
return this.strings[v];
};
amf.Reader.prototype.getObject = function(v) {
return this.objects[v];
};
amf.Reader.prototype.getTraits = function(v) {
return this.traits[v];
};
amf.Reader.prototype.rememberTraits = function(v) {
this.traits.push(v);
};
amf.Reader.prototype.rememberObject = function(v) {
this.objects.push(v);
};