Add DIMSE-Service package from Medken branch

This commit is contained in:
Erik Ziegler 2015-12-15 15:49:31 -05:00
parent a647666bf3
commit b851ffe10a
13 changed files with 6939 additions and 0 deletions

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// The list of the known DICOM modalities
// If you are running Orthanc with Docker, you need to put the contents of this file in
// /etc/orthanc/orthanc.json
"DicomModalities" : {
"OHIFDCM" : [ "OHIFDCM", "localhost", 3000 ]
},

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Package.describe({
name: "dimseservice",
summary: "DICOM DIMSE C-Service",
version: '0.0.1'
});
Package.onUse(function (api) {
//api.use("weiwei:dicomservices");
api.addFiles('server/require.js', 'server');
api.addFiles('server/constants.js', 'server');
api.addFiles('server/elements_data.js', 'server');
api.addFiles('server/Field.js', 'server');
api.addFiles('server/RWStream.js', 'server');
api.addFiles('server/Data.js', 'server');
api.addFiles('server/Message.js', 'server');
api.addFiles('server/PDU.js', 'server');
api.addFiles('server/Connection.js', 'server');
api.addFiles('server/DIMSE.js', 'server');
api.export("DIMSE", 'server');
});

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var EventEmitter = Npm.require('events').EventEmitter;
function time() {
return Math.floor(Date.now() / 1000);
}
var DEFAULT_MAX_PACKAGE_SIZE = 32768;
var DEFAULT_SOURCE_AE = "OHIFDCM";
var Envelope = function(conn, command, dataset) {
EventEmitter.call(this);
this.command = command;
this.dataset = dataset;
this.conn = conn;
}
util.inherits(Envelope, EventEmitter);
Envelope.prototype.send = function() {
return this;
}
Connection = function(socket, options) {
EventEmitter.call(this);
this.socket = socket;
this.options = Object.assign({
hostAE: "",
sourceAE: "OHIFDCM",
maxPackageSize: 32768,
idle: 60,
reconnect: true,
vr: {
split: true
}
}, options);
this.connected = false;
this.started = null;
this.lastReceived = null;
this.associated = false;
this.receiving = null;
this.receiveLength = null;
this.minRecv = null;
this.pendingPDVs = null;
this.server = null;
//this.retrieveModel = RETRIEVE_MODEL_STUDY_ROOT;
this.presentationContexts = [];
this.transferSyntaxes = [];
this.negotiatedContexts = {};
this.messages = {};
this.messageIdCounter = 0;
this.services = [];
this.lastCommand = null;
this.lastSent = null;
this.lastGets = [];
this.findContext = C.SOP_STUDY_ROOT_FIND;
//register hooks
var o = this;
this.socket.on("data", function(data) {
o.received(data);
});
this.socket.on("close", function(he) {
o.closed(he);
o.emit("close", he);
});
this.socket.on("error", function(he) {
o.error(he);
});
this.socket.on("end", function() {
if (o.intervalId) {
clearInterval(o.intervalId);
}
if (o.server) {
console.log("Closing server");
o.server.close();
}
console.log('ended');
})
this.on("released", function() {
this.released();
});
this.on('aborted', function() {
this.released();
})
this.on('message', function(pdvs) {
this.receivedMessage(pdvs);
});
this.on("init", this.ready);
//this.pause();
if (this.options.listenHost && this.options.listenPort) {
this.server = net.createServer();
this.server.listen(this.options.listenPort, this.options.listenHost);
this.server.on('listening', function() {
console.log("listening on %j", this.address());
});
this.server.on('connection', function(socket) {
});
}
this.emit("init");
}
util.inherits(Connection, EventEmitter);
Connection.prototype.checkIdle = function() {
var current = time(),
idl = this.options.idle;
if (!this.lastReceived && (current - this.started >= idl)) {
this.idleClose();
} else if (this.lastReceived && (current - this.lastReceived >= idl)) {
this.idleClose();
} else {
//console.log('keep idling')
}
};
Connection.prototype.released = function() {
this.socket.end();
};
Connection.prototype.idleClose = function() {
console.log('Exceed idle time, closing connection');
this.release();
};
Connection.prototype.getSoureceAE = function() {
return this.options.sourceAE;
};
Connection.prototype.ready = function() {
console.log("Connection established");
this.connected = true;
this.started = time();
var o = this;
this.intervalId = setInterval(function() {
o.checkIdle();
}, 3000);
//this.emit("init");
//this.startAssociationRequest();
};
Connection.prototype.resetReceive = function() {
this.receiving = this.receiveLength = null;
};
Connection.prototype.received = function(data) {
var i = 0;
do {
data = this.process(data);
} while (data !== null);
this.lastReceived = time();
};
Connection.prototype.process = function(data) {
//console.log("Data received");
if (this.receiving === null) {
if (this.minRecv) {
data = Buffer.concat([this.minRecv, data], this.minRecv.length + data.length);
this.minRecv = null;
}
if (data.length < 6) {
this.minRecv = data;
return null;
}
var stream = new ReadStream(data);
var type = stream.read(C.TYPE_UINT8);
stream.increment(1);
var len = stream.read(C.TYPE_UINT32),
cmp = data.length - 6;
if (len > cmp) {
this.receiving = data;
this.receiveLength = len;
} else {
var process = data,
remaining = null;
if (len < cmp) {
process = data.slice(0, len + 6);
remaining = data.slice(len + 6, cmp + 6);
}
this.resetReceive();
this.interpret(new ReadStream(process));
if (remaining) {
return remaining;
}
}
} else {
var newData = Buffer.concat([this.receiving, data], this.receiving.length + data.length),
pduLength = newData.length - 6;
if (pduLength < this.receiveLength) {
this.receiving = newData;
} else {
var remaining = null;
if (pduLength > this.receiveLength) {
remaining = newData.slice(this.receiveLength + 6, pduLength + 6);
newData = newData.slice(0, this.receiveLength + 6);
}
this.resetReceive();
this.interpret(new ReadStream(newData));
if (remaining) {
return remaining;
}
}
}
return null;
};
Connection.prototype.interpret = function(stream) {
var pdatas = [],
size = stream.size(),
o = this;
while (stream.offset < size) {
var pdu = pduByStream(stream);
//console.log("Received PDU-TYPE " + pdu.type);
if (pdu.is(C.ITEM_TYPE_PDU_ASSOCIATE_AC)) {
pdu.presentationContextItems.forEach(function(ctx) {
var requested = o.getContext(ctx.presentationContextID);
if (!requested) {
throw "Accepted presentation context not found";
}
o.negotiatedContexts[ctx.presentationContextID] = {
id: ctx.presentationContextID,
transferSyntax: ctx.transferSyntaxesItems[0].transferSyntaxName,
abstractSyntax: requested.abstractSyntax
};
var notfound = false;
o.services.forEach(function(service) {
if (service.contextUID == requested.abstractSyntax) {
service.contextID = ctx.presentationContextID;
}
});
});
//console.log('Accepted');
this.associated = true;
this.emit('associated', pdu);
} else if (pdu.is(C.ITEM_TYPE_PDU_RELEASE_RP)) {
//console.log('Released');
this.associated = false;
this.emit('released');
} else if (pdu.is(C.ITEM_TYPE_PDU_AABORT)) {
//console.log('Aborted');
this.emit('aborted');
} else if (pdu.is(C.ITEM_TYPE_PDU_PDATA)) {
pdatas.push(pdu);
}
}
if (pdatas) {
var pdvs = this.pendingPDVs ? this.pendingPDVs : [];
pdatas.forEach(function(pdata) {
pdvs = pdvs.concat(pdata.presentationDataValueItems);
});
this.pendingPDVs = null;
var i = 0,
count = pdvs.length;
while (i < count) {
if (!pdvs[i].isLast) {
var j = i + 1;
while (j < count) {
pdvs[i].messageStream.concat(pdvs[j].messageStream);
if (pdvs[j++].isLast) {
pdvs[i].isLast = true;
break;
}
}
if (pdvs[i].isLast) {
this.emit('message', pdvs[i]);
} else {
this.pendingPDVs = [pdvs[i]];
}
i = j;
} else {
this.emit('message', pdvs[i++]);
}
}
}
//this.release();
};
Connection.prototype.newMessageId = function() {
return (++this.messageIdCounter) % 255;
}
Connection.prototype.closed = function(had_error) {
this.connected = false;
console.log("Connection closed", had_error);
//this.destroy();
}
Connection.prototype.error = function(err) {
console.log("Error: ", err);
}
Connection.prototype.send = function(pdu, afterCbk) {
//console.log('SEND PDU-TYPE: ', pdu.type);
var toSend = pdu.buffer();
//console.log('send buffer', toSend.toString('hex'));
this.socket.write(toSend, afterCbk ? afterCbk : function() {
//console.log('Data written');
});
}
Connection.prototype.getSyntax = function(contextId) {
if (!this.negotiatedContexts[contextId]) return null;
return this.negotiatedContexts[contextId].transferSyntax;
}
Connection.prototype.getContextByUID = function(uid) {
for (var k in this.negotiatedContexts) {
var ctx = this.negotiatedContexts[k];
if (ctx.abstractSyntax == uid) {
return ctx;
}
}
return null;
}
Connection.prototype.getContextId = function(contextId) {
if (!this.negotiatedContexts[contextId]) return null;
return this.negotiatedContexts[contextId].id;
}
Connection.prototype.getContext = function(id) {
for (var k in this.presentationContexts) {
var ctx = this.presentationContexts[k];
if (id == ctx.id) return ctx;
}
return null;
}
Connection.prototype.setPresentationContexts = function(uids) {
var contexts = [],
id = 0;
uids.forEach(function(uid) {
contexts.push({
id: ++id,
abstractSyntax: uid,
transferSyntaxes: [C.IMPLICIT_LITTLE_ENDIAN, C.EXPLICIT_LITTLE_ENDIAN, C.EXPLICIT_BIG_ENDIAN]
});
});
this.presentationContexts = contexts;
}
Connection.prototype.verify = function() {
this.setPresentationContexts([C.SOP_VERIFICATION]);
this.startAssociationRequest(function() {
//associated, we can release now
this.release();
});
}
Connection.prototype.release = function() {
var releaseRQ = new ReleaseRQ();
this.send(releaseRQ);
}
Connection.prototype.addService = function(service) {
service.setConnection(this);
this.services.push(service);
}
Connection.prototype.receivedMessage = function(pdv) {
var syntax = this.getSyntax(pdv.contextId),
msg = readMessage(pdv.messageStream, pdv.type, syntax, this.options.vr);
if (msg.isCommand()) {
this.lastCommand = msg;
if (msg.isResponse()) {
if (msg.is(C.COMMAND_C_GET_RSP) || msg.is(C.COMMAND_C_MOVE_RSP)) {
//console.log('remaining', msg.getNumOfRemainingSubOperations(), msg.getNumOfCompletedSubOperations());
}
if (msg.failure()) {
//console.log("message failed with status ", msg.getStatus().toString(16));
}
if (msg.isFinal()) {
var replyId = msg.respondedTo();
if (this.messages[replyId].listener) {
this.messages[replyId].listener.emit('end', msg);
/*if (this.messages[replyId].listener[1]) {
this.messages[replyId].listener[1].call(this, msg);
}*/
if (!msg.haveData())
delete this.messages[replyId];
}
if (msg.is(C.COMMAND_C_GET_RSP)) {
if (!msg.getNumOfRemainingSubOperations()) {
if (this.lastGets && this.lastGets.length > 0) this.lastGets.shift();
}
}
}
} else {
/*if (msg.is(0x01)) {
console.log('ae title ', msg.getValue(0x00001031))
}*/
}
} else {
if (!this.lastCommand) {
throw "Only dataset?";
} else if (!this.lastCommand.haveData()) {
throw "Last command didn't indicate presence of data";
}
if (this.lastCommand.isResponse()) {
var replyId = this.lastCommand.respondedTo();
if (this.messages[replyId].listener) {
var flag = this.lastCommand.failure() ? true : false;
this.messages[replyId].listener.emit("result", msg, flag);
if (this.lastCommand.failure()) {
delete this.messages[replyId];
}
}
} else {
if (this.lastCommand.is(C.COMMAND_C_STORE_RQ)) {
var moveMessageId = this.lastCommand.getMoveMessageId(),
useId = moveMessageId;
if (!moveMessageId) {
//!! Going to deprecate now
//kinda hacky but we know this c-store is came from a c-get
if (this.lastGets.length > 0) {
useId = this.lastGets[0];
} else {
throw "Where does this c-store came from?";
}
} else console.log('move ', moveMessageId);
//this.storeResponse(useId, msg);
}
}
}
}
Connection.prototype.storeResponse = function(messageId, msg) {
var rq = this.messages[messageId];
if (rq.listener[2]) {
var status = rq.listener[2].call(this, msg);
if (status !== undefined && status !== null && rq.command.store) {
//store ok, ready to send c-store-rsp
var storeSr = rq.command.store,
replyMessage = storeSr.replyWith(status);
replyMessage.setAffectedSOPInstanceUID(this.lastCommand.getSOPInstanceUID());
replyMessage.setReplyMessageId(this.lastCommand.messageId);
this.sendMessage(replyMessage, null, null, storeSr);
} else {
throw "Missing store status";
}
}
}
Connection.prototype.sendMessage = function(context, command, dataset, listener) {
var nContext = this.getContextByUID(context),
syntax = nContext.transferSyntax,
cid = nContext.id,
messageId = this.newMessageId(),
msgData = {};
/*if (listener) {
if (typeof listener != 'object') {
listener = [listener, null];
}
msgData.listener = listener;
}*/
msgData.listener = new Envelope();
var pdata = new PDataTF(),
pdv = new PresentationDataValueItem(cid);
command.setSyntax(C.IMPLICIT_LITTLE_ENDIAN);
command.setContextId(context);
command.setMessageId(messageId);
if (dataset)
command.setDataSetPresent(C.DATA_SET_PRESENT);
this.lastSent = command;
if (command.is(C.COMMAND_C_GET_RQ)) {
this.lastGets.push(messageId);
}
pdv.setMessage(command);
pdata.setPresentationDataValueItems([pdv]);
msgData.command = command;
this.messages[messageId] = msgData;
/*var stream = new ReadStream(pdata.buffer()), np = pduByStream(stream), pdv = np.presentationDataValueItems[0];
var msg = readMessage(pdv.messageStream, pdv.type, C.IMPLICIT_LITTLE_ENDIAN);
console.log(msg.isCommand());
return;*/
this.send(pdata);
if (dataset) {
dataset.setSyntax(syntax);
var dsData = new PDataTF(),
dPdv = new PresentationDataValueItem(cid);
dPdv.setMessage(dataset);
dsData.setPresentationDataValueItems([dPdv]);
this.send(dsData);
}
return msgData.listener;
};
Connection.prototype.associate = function(options, callback) {
if (callback) {
this.once('associated', callback);
}
if (this.associated) {
this.emit('associated');
return;
}
if (options.contexts) {
this.setPresentationContexts(options.contexts);
} else {
throw "No services attached";
}
var associateRQ = new AssociateRQ();
associateRQ.setCalledAETitle(options.hostAE);
var sourceAE = options.sourceAE ? options.sourceAE : DEFAULT_SOURCE_AE;
associateRQ.setCallingAETitle(sourceAE);
associateRQ.setApplicationContextItem(new ApplicationContextItem());
var contextItems = []
this.presentationContexts.forEach(function(context) {
var contextItem = new PresentationContextItem(),
syntaxes = [];
context.transferSyntaxes.forEach(function(transferSyntax) {
var transfer = new TransferSyntaxItem();
transfer.setTransferSyntaxName(transferSyntax);
syntaxes.push(transfer);
});
contextItem.setTransferSyntaxesItems(syntaxes);
contextItem.setPresentationContextID(context.id);
var abstractItem = new AbstractSyntaxItem();
abstractItem.setAbstractSyntaxName(context.abstractSyntax);
contextItem.setAbstractSyntaxItem(abstractItem);
contextItems.push(contextItem);
});
associateRQ.setPresentationContextItems(contextItems);
var maxLengthItem = new MaximumLengthItem(),
classUIDItem = new ImplementationClassUIDItem(),
versionItem = new ImplementationVersionNameItem();
classUIDItem.setImplementationClassUID(C.IMPLEM_UID);
versionItem.setImplementationVersionName(C.IMPLEM_VERSION);
var packageSize = options.maxPackageSize ? options.maxPackageSize : DEFAULT_MAX_PACKAGE_SIZE;
maxLengthItem.setMaximumLengthReceived(packageSize);
var userInfo = new UserInformationItem();
userInfo.setUserDataItems([maxLengthItem, classUIDItem, versionItem]);
associateRQ.setUserInformationItem(userInfo);
this.send(associateRQ);
}
Connection.prototype.wrapMessage = function(data) {
if (data) {
var datasetMessage = new DataSetMessage();
datasetMessage.setElements(data);
return datasetMessage;
} else return data;
}
Connection.prototype.setFindContext = function(ctx) {
this.findContext = ctx;
}
Connection.prototype.find = function(params, callback) {
return this.sendMessage(this.findContext, new CFindRQ(), this.wrapMessage(params), callback);
}
Connection.prototype.findPatients = function(params, callback) {
var sendParams = Object.assign({
0x00080052: C.QUERY_RETRIEVE_LEVEL_PATIENT,
0x00100010: "",
0x00100020: "",
0x00100030: "",
0x00100040: "",
}, params);
return this.find(sendParams, callback);
}
Connection.prototype.findStudies = function(params, callback) {
var sendParams = Object.assign({
0x00080052: C.QUERY_RETRIEVE_LEVEL_STUDY,
0x00080020: "",
0x00100010: "",
0x00080061: "",
0x0020000D: ""
}, params);
return this.find(sendParams, callback);
}
Connection.prototype.findSeries = function(params, callback) {
var sendParams = Object.assign({
0x00080052: C.QUERY_RETRIEVE_LEVEL_SERIES,
0x00080020: "",
0x0020000E: "",
0x0008103E: "",
0x0020000D: ""
}, params);
return this.find(sendParams, callback);
}
Connection.prototype.findInstances = function(params, callback) {
var sendParams = Object.assign({
0x00080052: C.QUERY_RETRIEVE_LEVEL_IMAGE,
0x00080020: "",
0x0020000E: "",
0x0008103E: "",
0x0020000D: ""
}, params);
return this.find(sendParams, callback);
}

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var net = Npm.require('net'),
Future = Npm.require('fibers/future');
DIMSE = {};
DIMSE.associate = function(contexts, callback) {
var host = Meteor.settings.dimse.host,
port = Meteor.settings.dimse.port,
ae = Meteor.settings.dimse.hostAE;
var client = net.connect({
host: host,
port: port
},
function() { //'connect' listener
console.log('==Connected');
var conn = new Connection(client, {
vr: {
split: false
}
});
conn.associate({
contexts: contexts,
hostAE: ae
}, function(pdu) {
// associated
console.log('==Associated');
callback.call(conn, pdu);
});
});
};
DIMSE.retrievePatients = function(params) {
//var start = new Date();
var future = new Future;
DIMSE.associate([C.SOP_PATIENT_ROOT_FIND], function(pdu) {
var defaultParams = {
0x00100010: "",
0x00100020: "",
0x00100030: "",
0x00100040: "",
0x00101010: "",
0x00101040: ""
};
this.setFindContext(C.SOP_PATIENT_ROOT_FIND);
var result = this.findPatients(Object.assign(defaultParams, params)),
o = this;
var patients = [];
result.on('result', function(msg) {
patients.push(msg);
});
result.on('end', function() {
o.release();
});
this.on('close', function() {
//var time = new Date() - start;console.log(time + 'ms taken');
future.return(patients);
});
});
return future.wait();
};
DIMSE.retrieveStudies = function(params) {
//var start = new Date();
var future = new Future;
DIMSE.associate([C.SOP_STUDY_ROOT_FIND], function(pdu) {
var defaultParams = {
0x0020000D: "",
0x00080060: "",
0x00080005: "",
0x00080020: "",
0x00080030: "",
0x00080090: "",
0x00100010: "",
0x00100020: "",
0x00200010: "",
0x00100030: ""
};
this.setFindContext(C.SOP_STUDY_ROOT_FIND);
var result = this.findStudies(Object.assign(defaultParams, params)),
o = this;
var studies = [];
result.on('result', function(msg) {
studies.push(msg);
});
result.on('end', function() {
o.release();
});
this.on('close', function() {
//var time = new Date() - start;console.log(time + 'ms taken');
future.return(studies);
});
});
return future.wait();
};
DIMSE.retrieveSeries = function(studyInstanceUID, params) {
var future = new Future;
DIMSE.associate([C.SOP_STUDY_ROOT_FIND], function(pdu) {
var defaultParams = {
0x0020000D: studyInstanceUID ? studyInstanceUID : "",
0x00080005: "",
0x00080020: "",
0x00080030: "",
0x00080090: "",
0x00100010: "",
0x00100020: "",
0x00200010: "",
0x0008103E: "",
0x0020000E: "",
0x00200011: ""
};
this.setFindContext(C.SOP_STUDY_ROOT_FIND);
var result = this.findSeries(Object.assign(defaultParams, params)),
o = this;
var series = [];
result.on('result', function(msg) {
series.push(msg);
});
result.on('end', function() {
o.release();
});
this.on('close', function() {
future.return(series);
});
});
return future.wait();
};
DIMSE.retrieveInstances = function(studyInstanceUID, seriesInstanceUID, params) {
var future = new Future;
DIMSE.associate([C.SOP_STUDY_ROOT_FIND], function(pdu) {
var defaultParams = {
0x0020000D: studyInstanceUID ? studyInstanceUID : "",
0x0020000E: (studyInstanceUID && seriesInstanceUID) ? seriesInstanceUID : "",
0x00080005: "",
0x00080020: "",
0x00080030: "",
0x00080090: "",
0x00100010: "",
0x00100020: "",
0x00200010: "",
0x0008103E: "",
0x00200011: "",
0x00080016: "",
0x00080018: "",
0x00200013: "",
0x00280010: "",
0x00280011: "",
0x00280100: "",
0x00280103: ""
};
this.setFindContext(C.SOP_STUDY_ROOT_FIND);
var result = this.findInstances(Object.assign(defaultParams, params)),
o = this;
var instances = [];
result.on('result', function(msg) {
instances.push(msg);
});
result.on('end', function() {
o.release();
});
this.on('close', function() {
future.return(instances);
});
});
return future.wait();
};

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function paddingLeft(paddingValue, string) {
return String(paddingValue + string).slice(-paddingValue.length);
};
function rtrim(str) {
return str.replace(/\s*$/g, '');
}
function ltrim(str) {
return str.replace(/^\s*/g, '');
}
function fieldsLength(fields) {
var length = 0;
fields.forEach(function(field) {
length += field.length();
});
return length;
};
Tag = function(value) {
this.value = value;
};
Tag.prototype.toString = function() {
return "(" + paddingLeft("0000", this.group().toString(16)) + "," +
paddingLeft("0000", this.element().toString(16)) + ")";
}
Tag.prototype.is = function(t) {
return this.value == t;
}
Tag.prototype.group = function() {
return this.value >>> 16;
}
Tag.prototype.element = function() {
return this.value & 0xffff;
}
tagFromNumbers = function(group, element) {
return new Tag(((group << 16) | element) >>> 0);
}
function readTag(stream) {
var group = stream.read(C.TYPE_UINT16),
element = stream.read(C.TYPE_UINT16);
var tag = tagFromNumbers(group, element);
return tag;
}
parseElements = function (stream, syntax) {
var pairs = {};
stream.reset();
while (!stream.end()) {
var elem = new DataElement();
elem.setSyntax(syntax);
elem.readBytes(stream);
pairs[elem.tag.value] = elem;
}
return pairs;
}
ValueRepresentation = function(type) {
this.type = type;
this.multi = false;
}
ValueRepresentation.prototype.read = function(stream, length, syntax) {
if (this.fixed && this.maxLength) {
if (!length)
return this.defaultValue;
if (this.maxLength != length)
throw "Invalid length for fixed length tag, vr " + this.type + ", length " + this.maxLength + " != " + length;
}
return this.readBytes(stream, length, syntax);
}
ValueRepresentation.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_ASCII, length);
}
ValueRepresentation.prototype.readNullPaddedString = function(stream, length) {
if (!length) return "";
var str = stream.read(C.TYPE_ASCII, length - 1);
if (stream.read(C.TYPE_UINT8) != 0) {
stream.increment(-1);
str += stream.read(C.TYPE_ASCII, 1);
}
return str;
}
ValueRepresentation.prototype.getFields = function(fields) {
var valid = true;
if (this.checkLength) {
valid = this.checkLength(fields);
} else if (this.maxCharLength) {
var check = this.maxCharLength, length = 0;
fields.forEach(function(field){
if (typeof field.value == 'string')
length += field.value.length;
});
valid = length <= check;
} else if (this.maxLength) {
var check = this.maxLength, length = fieldsLength(fields);
valid = length <= check;
}
if (!valid)
throw "Value exceeds max length";
//check for odd
var length = fieldsLength(fields);
if (length & 1) {
fields.push(new HexField(this.padByte));
}
for (var i = 0;i < fields.length;i++) {
if (fields[i].isNumeric() && (fields[i].value === "" || fields[i].value === null)) {
fields[i] = new StringField("");
}
}
return fields;
}
ApplicationEntity = function() {
ValueRepresentation.call(this, "AE");
this.maxLength = 16;
this.padByte = "20";
};
util.inherits(ApplicationEntity, ValueRepresentation);
ApplicationEntity.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_ASCII, length).trim();
}
ApplicationEntity.prototype.getFields = function(value) {
return ApplicationEntity.super_.prototype.getFields.call(this, [new FilledField(value, 16)]);
}
CodeString = function() {
ValueRepresentation.call(this, "CS");
this.maxLength = 16;
this.padByte = "20";
};
util.inherits(CodeString, ValueRepresentation);
CodeString.prototype.readBytes = function(stream, length) {
var str = this.readNullPaddedString(stream, length);
return str.trim();
}
CodeString.prototype.getFields = function(value) {
return CodeString.super_.prototype.getFields.call(this, [new StringField(value)]);
}
AgeString = function() {
ValueRepresentation.call(this, "AS");
this.maxLength = 4;
this.padByte = "20";
this.fixed = true;
this.defaultValue = "";
};
util.inherits(AgeString, ValueRepresentation);
AgeString.prototype.getFields = function(value) {
var str = "";
if (value) {
if (value.days) {
str = paddingLeft("000" + value.days) + "D";
} else if (value.weeks) {
str = paddingLeft("000" + value.weeks) + "W";
} else if (value.months) {
str = paddingLeft("000" + value.months) + "M";
} else if (value.years) {
str = paddingLeft("000" + value.years) + "Y";
} else {
throw "Invalid age string";
}
}
return AgeString.super_.prototype.getFields.call(this, [new StringField(str)]);
}
AttributeTag = function() {
ValueRepresentation.call(this, "AT");
this.maxLength = 4;
this.padByte = "00";
this.fixed = true;
};
util.inherits(AttributeTag, ValueRepresentation);
AttributeTag.prototype.readBytes = function(stream, length) {
var group = stream.read(C.TYPE_UINT16), element = stream.read(C.TYPE_UINT16);
return tagFromNumbers(group, element);
}
AttributeTag.prototype.getFields = function(value) {
return AttributeTag.super_.prototype.getFields.call(this, [new UInt16Field(value.group()), new UInt16Field(value.element())]);
}
DateValue = function() {
ValueRepresentation.call(this, "DA");
this.maxLength = 8;
this.padByte = "20";
this.fixed = true;
this.defaultValue = "";
};
util.inherits(DateValue, ValueRepresentation);
DateValue.prototype.readBytes = function(stream, length) {
var datestr = stream.read(C.TYPE_ASCII, 8);
var year = parseInt(datestr.substring(0,4)),
month = parseInt(datestr.substring(4,6)),
day = parseInt(datestr.substring(6,8));
return datestr;//new Date(year, month, day);
}
DateValue.prototype.getFields = function(date) {
var str = null;
if (typeof date == 'object') {
var year = date.getFullYear(), month = paddingLeft("00", date.getMonth()), day = paddingLeft("00", date.getDate());
str = year + month + day;
} else if (date && date.length > 0) {
this.maxLength = 18;
this.fixed = false;
str = date;
} else {
str = "";
}
return DateValue.super_.prototype.getFields.call(this, [new StringField(str)]);
}
DecimalString = function() {
ValueRepresentation.call(this, "DS");
this.maxLength = 16;
this.padByte = "20";
};
util.inherits(DecimalString, ValueRepresentation);
DecimalString.prototype.readBytes = function(stream, length) {
var str = this.readNullPaddedString(stream, length);
return str.trim();
}
DecimalString.prototype.getFields = function(value) {
var f = parseFloat(value);
return DecimalString.super_.prototype.getFields.call(this, [new StringField(isNaN(f) ? '' : f.toExponential())]);
}
DateTime = function() {
ValueRepresentation.call(this, "DT");
this.maxLength = 26;
this.padByte = "20";
};
util.inherits(DateTime, ValueRepresentation);
DateTime.prototype.getFields = function(value) {
var year = date.getUTCFullYear(), month = paddingLeft("00", date.getUTCMonth()),
day = paddingLeft("00", date.getUTCDate()), hour = paddingLeft("00", date.getUTCHours()),
minute = paddingLeft("00", date.getUTCMinutes()), second = paddingLeft("00", date.getUTCSeconds()),
millisecond = paddingLeft("000", date.getUTCMilliseconds());
return DateTime.super_.prototype.getFields.call(this, [new StringField(year + month + day + hour + minute + second + "." + millisecond + "+0000")]);
}
FloatingPointSingle = function() {
ValueRepresentation.call(this, "FL");
this.maxLength = 4;
this.padByte = "00";
this.fixed = true;
this.defaultValue = 0.0;
};
util.inherits(FloatingPointSingle, ValueRepresentation);
FloatingPointSingle.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_FLOAT);
}
FloatingPointSingle.prototype.getFields = function(value) {
return FloatingPointSingle.super_.prototype.getFields.call(this, [new FloatField(value)]);
}
FloatingPointDouble = function() {
ValueRepresentation.call(this, "FD");
this.maxLength = 8;
this.padByte = "00";
this.fixed = true;
this.defaultValue = 0.0;
};
util.inherits(FloatingPointDouble, ValueRepresentation);
FloatingPointDouble.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_DOUBLE);
}
FloatingPointDouble.prototype.getFields = function(value) {
return FloatingPointDouble.super_.prototype.getFields.call(this, [new DoubleField(value)]);
}
IntegerString = function() {
ValueRepresentation.call(this, "IS");
this.maxLength = 12;
this.padByte = "20";
};
util.inherits(IntegerString, ValueRepresentation);
IntegerString.prototype.readBytes = function(stream, length) {
var str = this.readNullPaddedString(stream, length);
return str.trim();
}
IntegerString.prototype.getFields = function(value) {
return IntegerString.super_.prototype.getFields.call(this, [new StringField(value.toString())]);
}
LongString = function() {
ValueRepresentation.call(this, "LO");
this.maxCharLength = 64;
this.padByte = "20";
};
util.inherits(LongString, ValueRepresentation);
LongString.prototype.readBytes = function(stream, length) {
var str = this.readNullPaddedString(stream, length);
return str.trim();
}
LongString.prototype.getFields = function(value) {
return LongString.super_.prototype.getFields.call(this, [new StringField(value ? value : "")]);
}
LongText = function() {
ValueRepresentation.call(this, "LT");
this.maxCharLength = 10240;
this.padByte = "20";
};
util.inherits(LongText, ValueRepresentation);
LongText.prototype.readBytes = function(stream, length) {
var str = this.readNullPaddedString(stream, length);
return rtrim(str);
}
LongText.prototype.getFields = function(value) {
return LongText.super_.prototype.getFields.call(this, [new StringField(value)]);
}
PersonName = function() {
ValueRepresentation.call(this, "PN");
this.maxLength = null;
this.padByte = "20";
};
util.inherits(PersonName, ValueRepresentation);
PersonName.prototype.checkLength = function(field) {
var cmps = field[0].value.split(/\^/);
for (var i in cmps) {
var cmp = cmps[i];
if (cmp.length > 64) return false;
}
return true;
}
PersonName.prototype.readBytes = function(stream, length) {
var str = this.readNullPaddedString(stream, length);
return rtrim(str);
}
PersonName.prototype.getFields = function(value) {
var str = null;
if (typeof value == 'string') {
str = value;
} else if (value) {
var fName = value.family || "", gName = value.given || "",
middle = value.middle || "", prefix = value.prefix || "", suffix = value.suffix || "";
str = [fName, gName, middle, prefix, suffix].join("^");
} else str = '';
return PersonName.super_.prototype.getFields.call(this, [new StringField(str)]);
}
ShortString = function() {
ValueRepresentation.call(this, "SH");
this.maxCharLength = 16;
this.padByte = "20";
};
util.inherits(ShortString, ValueRepresentation);
ShortString.prototype.readBytes = function(stream, length) {
var str = this.readNullPaddedString(stream, length);
return str.trim();
}
ShortString.prototype.getFields = function(value) {
return ShortString.super_.prototype.getFields.call(this, [new StringField(value)]);
}
SignedLong = function() {
ValueRepresentation.call(this, "SL");
this.maxLength = 4;
this.padByte = "00";
this.fixed = true;
this.defaultValue = 0;
};
util.inherits(SignedLong, ValueRepresentation);
SignedLong.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_INT32);
}
SignedLong.prototype.getFields = function(value) {
return SignedLong.super_.prototype.getFields.call(this, [new Int32Field(value)]);
}
SequenceOfItems = function() {
ValueRepresentation.call(this, "SQ");
this.maxLength = null;
this.padByte = "00";
};
util.inherits(SequenceOfItems, ValueRepresentation);
SequenceOfItems.prototype.readBytes = function(stream, sqlength, syntax) {
if (sqlength == 0x0) {
return []; //contains no dataset
} else {
var undefLength = sqlength == 0xffffffff, elements = [], read = 0;
while (true) {
var tag = readTag(stream), length = null;
read += 4;
if (tag.is(0xfffee0dd)) {
stream.read(C.TYPE_UINT32)
break;
} else if (!undefLength && (read == sqlength)) {
break;
} else if (tag.is(0xfffee000)) {
length = stream.read(C.TYPE_UINT32);
read += 4;
var itemStream = null, toRead = 0, undef = length == 0xffffffff;
if (undef) {
var stack = 0;
while (1) {
var g = stream.read(C.TYPE_UINT16);
if (g == 0xfffe) {
var ge = stream.read(C.TYPE_UINT16);
if (ge == 0xe00d) {
stack--;
if (stack < 0) {
stream.increment(4);
read += 8;
break;
} else {
toRead += 4;
}
} else if (ge == 0xe000) {
stack++;
toRead += 4;
} else {
toRead += 2;
stream.increment(-2);
}
} else {
toRead += 2;
}
}
} else {
toRead = length;
}
if (toRead) {
stream.increment(undef ? (-toRead-8) : 0);
itemStream = stream.more(toRead);//parseElements
read += toRead;
if (undef)
stream.increment(8);
elements.push(parseElements(itemStream, syntax));
}
if (!undefLength && (read == sqlength)) {
break;
}
}
}
return elements;
}
}
SequenceOfItems.prototype.getFields = function(value, syntax) {
var fields = [];
if (value) {
value.forEach(function(message) {
fields.push(new UInt16Field(0xfffe));
fields.push(new UInt16Field(0xe000));
fields.push(new UInt32Field(0xffffffff));
message.forEach(function(element) {
element.setSyntax(syntax);
fields = fields.concat(element.getFields());
});
fields.push(new UInt16Field(0xfffe));
fields.push(new UInt16Field(0xe00d));
fields.push(new UInt32Field(0x00000000));
});
}
fields.push(new UInt16Field(0xfffe));
fields.push(new UInt16Field(0xe0dd));
fields.push(new UInt32Field(0x00000000));
return SequenceOfItems.super_.prototype.getFields.call(this, fields);
}
SignedShort = function() {
ValueRepresentation.call(this, "SS");
this.maxLength = 2;
this.padByte = "00";
this.fixed = true;
this.defaultValue = 0;
};
util.inherits(SignedShort, ValueRepresentation);
SignedShort.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_INT16);
}
SignedShort.prototype.getFields = function(value) {
return SignedShort.super_.prototype.getFields.call(this, [new Int16Field(value)]);
}
ShortText = function() {
ValueRepresentation.call(this, "ST");
this.maxCharLength = 1024;
this.padByte = "20";
};
util.inherits(ShortText, ValueRepresentation);
ShortText.prototype.readBytes = function(stream, length) {
var str = this.readNullPaddedString(stream, length);
return rtrim(str);
}
ShortText.prototype.getFields = function(value) {
return ShortText.super_.prototype.getFields.call(this, [new StringField(value)]);
}
TimeValue = function() {
ValueRepresentation.call(this, "TM");
this.maxLength = 14;
this.padByte = "20";
};
util.inherits(TimeValue, ValueRepresentation);
TimeValue.prototype.readBytes = function(stream, length) {
return rtrim(stream.read(C.TYPE_ASCII, length));
}
TimeValue.prototype.getFields = function(date) {
var dateStr = '';
if (date) {
var hour = paddingLeft("00", date.getHours()),
minute = paddingLeft("00", date.getMinutes()), second = paddingLeft("00", date.getSeconds()),
millisecond = paddingLeft("000", date.getMilliseconds());
dateStr = hour + minute + second + "." + millisecond;
}
return TimeValue.super_.prototype.getFields.call(this, [new StringField(dateStr)]);
}
UnlimitedCharacters = function() {
ValueRepresentation.call(this, "UC");
this.maxLength = null;
this.multi = true;
this.padByte = "20";
};
util.inherits(UnlimitedCharacters, ValueRepresentation);
UnlimitedCharacters.prototype.readBytes = function(stream, length) {
return rtrim(stream.read(C.TYPE_ASCII, length));
}
UnlimitedCharacters.prototype.getFields = function(value) {
return UnlimitedCharacters.super_.prototype.getFields.call(this, [new StringField(value)]);
}
UnlimitedText = function() {
ValueRepresentation.call(this, "UT");
this.maxLength = null;
this.padByte = "20";
};
util.inherits(UnlimitedText, ValueRepresentation);
UnlimitedText.prototype.readBytes = function(stream, length) {
return this.readNullPaddedString(stream, length);
}
UnlimitedText.prototype.getFields = function(value) {
return UnlimitedText.super_.prototype.getFields.call(this, [new StringField(value)]);
}
UnsignedShort = function() {
ValueRepresentation.call(this, "US");
this.maxLength = 2;
this.padByte = "00";
this.fixed = true;
this.defaultValue = 0;
};
util.inherits(UnsignedShort, ValueRepresentation);
UnsignedShort.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_UINT16);
}
UnsignedShort.prototype.getFields = function(value) {
return UnsignedShort.super_.prototype.getFields.call(this, [new UInt16Field(value)]);
}
UnsignedLong = function() {
ValueRepresentation.call(this, "UL");
this.maxLength = 4;
this.padByte = "00";
this.fixed = true;
this.defaultValue = 0;
};
util.inherits(UnsignedLong, ValueRepresentation);
UnsignedLong.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_UINT32);
}
UnsignedLong.prototype.getFields = function(value) {
return UnsignedLong.super_.prototype.getFields.call(this, [new UInt32Field(value)]);
}
UniqueIdentifier = function() {
ValueRepresentation.call(this, "UI");
this.maxLength = 64;
this.padByte = "00";
};
util.inherits(UniqueIdentifier, ValueRepresentation);
UniqueIdentifier.prototype.readBytes = function(stream, length) {
return this.readNullPaddedString(stream, length);
}
UniqueIdentifier.prototype.getFields = function(value) {
return UniqueIdentifier.super_.prototype.getFields.call(this, [new StringField(value)]);
}
UniversalResource = function() {
ValueRepresentation.call(this, "UR");
this.maxLength = null;
this.padByte = "20";
};
util.inherits(UniversalResource, ValueRepresentation);
UniversalResource.prototype.readBytes = function(stream, length) {
return rtrim(stream.read(C.TYPE_ASCII, length));
}
UniversalResource.prototype.getFields = function(value) {
return UniversalResource.super_.prototype.getFields.call(this, [new StringField(value)]);
}
UnknownValue = function() {
ValueRepresentation.call(this, "UN");
this.maxLength = null;
this.padByte = "00";
};
util.inherits(UnknownValue, ValueRepresentation);
UnknownValue.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_ASCII, length);
}
UnknownValue.prototype.getFields = function(value) {
return UnknownValue.super_.prototype.getFields.call(this, [new StringField(value)]);
}
OtherWordString = function() {
ValueRepresentation.call(this, "OW");
this.maxLength = null;
this.padByte = "00";
};
util.inherits(OtherWordString, ValueRepresentation);
OtherWordString.prototype.readBytes = function(stream, length) {
return stream.read(C.TYPE_ASCII, length);
}
OtherWordString.prototype.getFields = function(value) {
return OtherWordString.super_.prototype.getFields.call(this, [new StringField(value)]);
}
elementByType = function(type, value, syntax) {
var elem = null, nk = DicomElements.dicomNDict[type];
if (nk) {
if (nk.vr == 'SQ') {
var sq = [];
if (value)
value.forEach(function(el) {
var values = [];
for (var tag in el) {
values.push(elementByType(tag, el[tag], syntax));
}
sq.push(values);
});
elem = new DataElement(type, nk.vr, nk.vm, sq, false, syntax);
} else {
elem = new DataElement(type, nk.vr, nk.vm, value, false, syntax);
}
} else {
throw "Unrecognized element type";
}
return elem;
}
elementDataByTag = function(tag) {
var nk = DicomElements.dicomNDict[tag];
if (nk) {
return nk;
}
throw ("Unrecognized tag " + (tag >>> 0).toString(16));
}
elementKeywordByTag = function(tag) {
var nk = elementDataByTag(tag);
return nk.keyword;
}
vrByType = function(type) {
var vr = null;
if (type == "AE") vr = new ApplicationEntity();
else if (type == "AS") vr = new AgeString();
else if (type == "AT") vr = new AttributeTag();
else if (type == "CS") vr = new CodeString();
else if (type == "DA") vr = new DateValue();
else if (type == "DS") vr = new DecimalString();
else if (type == "DT") vr = new DateTime();
else if (type == "FL") vr = new FloatingPointSingle();
else if (type == "FD") vr = new FloatingPointDouble();
else if (type == "IS") vr = new IntegerString();
else if (type == "LO") vr = new LongString();
else if (type == "LT") vr = new LongText();
else if (type == "OB") vr = new OtherByteString();
else if (type == "OD") vr = new OtherDoubleString();
else if (type == "OF") vr = new OtherFloatString();
else if (type == "OW") vr = new OtherWordString();
else if (type == "PN") vr = new PersonName();
else if (type == "SH") vr = new ShortString();
else if (type == "SL") vr = new SignedLong();
else if (type == "SQ") vr = new SequenceOfItems();
else if (type == "SS") vr = new SignedShort();
else if (type == "ST") vr = new ShortText();
else if (type == "TM") vr = new TimeValue();
else if (type == "UC") vr = new UnlimitedCharacters();
else if (type == "UI") vr = new UniqueIdentifier();
else if (type == "UL") vr = new UnsignedLong();
else if (type == "UN") vr = new UnknownValue();
else if (type == "UR") vr = new UniversalResource();
else if (type == "US") vr = new UnsignedShort();
else if (type == "UT") vr = new UnlimitedText();
else throw "Invalid vr type " + type;
return vr;
}
readElements = function(stream, syntax) {
if (stream.end()) return false;
var oldEndian = stream.endian;
stream.setEndian(this.endian);
var group = stream.read(C.TYPE_UINT16),
element = stream.read(C.TYPE_UINT16),
tag = new Tag((group << 16) | element),
length = stream.read(C.TYPE_UINT32);
stream.setEndian(oldEndian);
}
var explicitVRList = ["OB", "OW", "OF", "SQ", "UC", "UR", "UT", "UN"],
binaryVRs = ["FL", "FD", "SL", "SS", "UL", "US"];
DataElement = function(tag, vr, vm, value, vvr, syntax, options) {
this.vr = vr ? vrByType(vr) : null;
this.tag = !vvr ? new Tag(tag) : tag;
this.value = value;
this.vm = vm;
this.vvr = vvr ? true : false;
this.setOptions(options);
this.setSyntax(syntax ? syntax : C.IMPLICIT_LITTLE_ENDIAN);
};
DataElement.prototype.setOptions = function(options) {
this.options = Object.assign({split : true}, options);
}
DataElement.prototype.setSyntax = function(syn) {
this.syntax = syn;
this.implicit = this.syntax == C.IMPLICIT_LITTLE_ENDIAN ? true : false;
this.endian = (this.syntax == C.IMPLICIT_LITTLE_ENDIAN || this.syntax == C.EXPLICIT_LITTLE_ENDIAN) ? C.LITTLE_ENDIAN : C.BIG_ENDIAN;
}
DataElement.prototype.getValue = function() {
if (!this.singleValue() && !this.isBinaryNumber()) {
return this.options.split ? this.value.split(String.fromCharCode(0x5c)) : this.value;
} else {
return this.value;
}
}
DataElement.prototype.singleValue = function() {
return this.vm == C.VM_SINGLE ? true : false;
}
DataElement.prototype.getVMNum = function() {
var num = 1;
switch(this.vm) {
case C.VM_SINGLE : num = 1; break;
case C.VM_TWO : num = 2; break;
case C.VM_THREE : num = 3; break;
case C.VM_FOUR : num = 4; break;
case C.VM_16 : num = 16; break;
default : break;
}
return num;
}
DataElement.prototype.isBinaryNumber = function() {
return binaryVRs.indexOf(this.vr.type) != -1;
}
DataElement.prototype.length = function(fields) {
//let fields = this.vr.getFields(this.value);
return fieldsLength(fields);
}
DataElement.prototype.readBytes = function(stream) {
var oldEndian = stream.endian;
stream.setEndian(this.endian);
var group = stream.read(C.TYPE_UINT16),
element = stream.read(C.TYPE_UINT16),
tag = tagFromNumbers(group, element);
var length = null, vr = null, edata = elementDataByTag(tag.value),
vm = edata.vm;
if (this.implicit) {
length = stream.read(C.TYPE_UINT32);
vr = edata.vr;
} else {
vr = stream.read(C.TYPE_ASCII, 2);
if (explicitVRList.indexOf(vr) != -1) {
stream.increment(2);
length = stream.read(C.TYPE_UINT32);
} else {
length = stream.read(C.TYPE_UINT16);
}
}
this.vr = vrByType(vr);
this.tag = tag;
this.vm = vm;
//try {
if (this.isBinaryNumber() && length > this.vr.maxLength) {
var times = length / this.vr.maxLength, i = 0;
this.value = [];//console.log(times, length, this.vr.maxLength);return;
//try {
while (i++ < times) {
this.value.push(this.vr.read(stream, this.vr.maxLength));
}
//} catch (e) { }
} else {
this.value = this.vr.read(stream, length, this.syntax);
}
//} catch (e) { console.log('error', vr, length); }
stream.setEndian(oldEndian);
}
DataElement.prototype.write = function(stream) {
var oldEndian = stream.endian;
stream.setEndian(this.endian);
var fields = this.getFields();
fields.forEach(function(field){
field.write(stream);
});
stream.setEndian(oldEndian);
}
DataElement.prototype.getFields = function() {
var fields = [new UInt16Field(this.tag.group()), new UInt16Field(this.tag.element())],
valueFields = this.vr.getFields(this.value, this.syntax), valueLength = fieldsLength(valueFields), vrType = this.vr.type;
if (vrType == "SQ") {
valueLength = 0xffffffff;
}
if (this.implicit) {
fields.push(new UInt32Field(valueLength));
} else {
if (explicitVRList.indexOf(vrType) != -1) {
fields.push(new StringField(vrType), new ReservedField(2), new UInt32Field(valueLength));
} else {
fields.push(new StringField(vrType), new UInt16Field(valueLength));
}
}
fields = fields.concat(valueFields);
return fields;
}

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Field = function(type, value) {
this.type = type;
this.value = value;
};
Field.prototype.length = function() {
return calcLength(this.type, this.value);
}
Field.prototype.write = function(stream) {
stream.write(this.type, this.value);
}
Field.prototype.isNumeric = function() {
return false;
}
StringField = function(str) {
Field.call(this, C.TYPE_ASCII, typeof str == 'string' ? str : "");
}
util.inherits(StringField, Field);
FilledField = function(value, length) {
Field.call(this, C.TYPE_COMPOSITE, value);
this.fillLength = length;
}
util.inherits(FilledField, Field);
FilledField.prototype.length = function() {
return this.fillLength;
}
FilledField.prototype.write = function(stream) {
var len = this.value.length;
if (len < this.fillLength && len >= 0) {
if (len > 0)
stream.write(C.TYPE_ASCII, this.value);
var zeroLength = this.fillLength - len;
stream.write(C.TYPE_HEX, "20".repeat(zeroLength));
} else if (len == this.fillLength) {
stream.write(C.TYPE_ASCII, this.value);
} else {
throw "Length mismatch";
}
}
HexField = function(hex) {
Field.call(this, C.TYPE_HEX, hex);
}
util.inherits(HexField, Field);
ReservedField = function(length) {
length = length || 1;
Field.call(this, C.TYPE_HEX, "00".repeat(length));
}
util.inherits(ReservedField, Field);
UInt8Field = function(value) {
Field.call(this, C.TYPE_UINT8, value);
}
util.inherits(UInt8Field, Field);
UInt8Field.prototype.isNumeric = function() {
return true;
}
UInt16Field = function(value) {
Field.call(this, C.TYPE_UINT16, value);
}
util.inherits(UInt16Field, Field);
UInt16Field.prototype.isNumeric = function() {
return true;
}
UInt32Field = function(value) {
Field.call(this, C.TYPE_UINT32, value);
}
util.inherits(UInt32Field, Field);
UInt32Field.prototype.isNumeric = function() {
return true;
}
Int8Field = function(value) {
Field.call(this, C.TYPE_INT8, value);
}
util.inherits(Int8Field, Field);
Int8Field.prototype.isNumeric = function() {
return true;
}
Int16Field = function(value) {
Field.call(this, C.TYPE_INT16, value);
}
util.inherits(Int16Field, Field);
Int16Field.prototype.isNumeric = function() {
return true;
}
Int32Field = function(value) {
Field.call(this, C.TYPE_INT32, value);
}
util.inherits(Int32Field, Field);
Int32Field.prototype.isNumeric = function() {
return true;
}
FloatField = function(value) {
Field.call(this, C.TYPE_FLOAT, value);
}
util.inherits(FloatField, Field);
FloatField.prototype.isNumeric = function() {
return true;
}
DoubleField = function(value) {
Field.call(this, C.TYPE_DOUBLE, value);
}
util.inherits(DoubleField, Field);
DoubleField.prototype.isNumeric = function() {
return true;
}

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DicomMessage = function(syntax) {
this.syntax = syntax ? syntax : null;
this.type = C.DATA_TYPE_COMMAND;
this.messageId = C.DEFAULT_MESSAGE_ID;
this.elementPairs = {};
};
DicomMessage.prototype.isCommand = function() {
return this.type == C.DATA_TYPE_COMMAND;
}
DicomMessage.prototype.setSyntax = function(syntax) {
this.syntax = syntax;
for (var tag in this.elementPairs) {
this.elementPairs[tag].setSyntax(this.syntax);
}
}
DicomMessage.prototype.setMessageId = function(id) {
this.messageId = id;
}
DicomMessage.prototype.setReplyMessageId = function(id) {
this.replyMessageId = id;
}
DicomMessage.prototype.command = function(cmds) {
cmds.unshift(this.newElement(0x00000800, this.dataSetPresent ? C.DATA_SET_PRESENT : C.DATE_SET_ABSENCE));
cmds.unshift(this.newElement(0x00000700, this.priority));
cmds.unshift(this.newElement(0x00000110, this.messageId));
cmds.unshift(this.newElement(0x00000100, this.commandType));
cmds.unshift(this.newElement(0x00000002, this.contextUID));
var length = 0;
cmds.forEach(function(cmd) {
length += cmd.length(cmd.getFields());
});
cmds.unshift(this.newElement(0x00000000, length));
return cmds;
}
DicomMessage.prototype.response = function(cmds) {
cmds.unshift(this.newElement(0x00000800, this.dataSetPresent ? C.DATA_SET_PRESENT : C.DATE_SET_ABSENCE));
cmds.unshift(this.newElement(0x00000120, this.replyMessageId));
cmds.unshift(this.newElement(0x00000100, this.commandType));
cmds.unshift(this.newElement(0x00000002, this.contextUID));
var length = 0;
cmds.forEach(function(cmd) {
length += cmd.length(cmd.getFields());
});
cmds.unshift(this.newElement(0x00000000, length));
return cmds;
}
DicomMessage.prototype.setElements = function(pairs) {
var p = {};
for (var tag in pairs) {
p[tag] = this.newElement(tag, pairs[tag]);
}
this.elementPairs = p;
}
DicomMessage.prototype.newElement = function(tag, value) {
return elementByType(tag, value, this.syntax);
}
DicomMessage.prototype.setElement = function(key, value) {
this.elementPairs[key] = elementByType(key, value);
}
DicomMessage.prototype.setElementPairs = function(pairs) {
this.elementPairs = pairs;
}
DicomMessage.prototype.setContextId = function(context) {
this.contextUID = context;
}
DicomMessage.prototype.setPriority = function(pri) {
this.priority = pri;
}
DicomMessage.prototype.setType = function(type) {
this.type = type;
}
DicomMessage.prototype.setDataSetPresent = function(present) {
this.dataSetPresent = present == 0x0101 ? false : true;
}
DicomMessage.prototype.haveData = function() {
return this.dataSetPresent;
}
DicomMessage.prototype.tags = function() {
return Object.keys(this.elementPairs);
}
DicomMessage.prototype.key = function(tag) {
return elementKeywordByTag(tag);
}
DicomMessage.prototype.getValue = function(tag) {
return this.elementPairs[tag] ? this.elementPairs[tag].getValue() : null;
}
DicomMessage.prototype.affectedSOPClassUID = function() {
return this.getValue(0x00000002);
}
DicomMessage.prototype.getMessageId = function() {
return this.getValue(0x00000110);
}
DicomMessage.prototype.getFields = function() {
var eles = [];
for (var tag in this.elementPairs) {
eles.push(this.elementPairs[tag]);
}
return eles;
}
DicomMessage.prototype.length = function(elems) {
var len = 0;
elems.forEach(function(elem){
len += elem.length(elem.getFields());
});
return len;
}
DicomMessage.prototype.isResponse = function() {
return false;
}
DicomMessage.prototype.is = function(type) {
return this.commandType == type;
}
DicomMessage.prototype.write = function(stream) {
var fields = this.getFields(), o = this;
fields.forEach(function(field){
field.setSyntax(o.syntax);
field.write(stream);
});
}
DicomMessage.prototype.printElements = function(pairs, indent) {
var typeName = "";
for (var tag in pairs) {
var value = pairs[tag].getValue();
typeName += (" ".repeat(indent)) + this.key(tag) + " : ";
if (value instanceof Array) {
var o = this;
value.forEach(function(p) {
if (typeof p == "object") {
typeName += "[\n" + o.printElements(p, indent + 2) + (" ".repeat(indent)) + "]";
} else {
typeName += "[" + p + "]";
}
});
if (typeName[typeName.length-1] != "\n") {
typeName += "\n";
}
} else {
typeName += value + "\n";
}
}
return typeName;
}
DicomMessage.prototype.toString = function() {
var typeName = "";
if (!this.isCommand()) {
typeName = "DateSet Message";
} else {
switch (this.commandType) {
case C.COMMAND_C_GET_RSP : typeName = "C-GET-RSP"; break;
case C.COMMAND_C_MOVE_RSP : typeName = "C-MOVE-RSP"; break;
case C.COMMAND_C_GET_RQ : typeName = "C-GET-RQ"; break;
case C.COMMAND_C_STORE_RQ : typeName = "C-STORE-RQ"; break;
case C.COMMAND_C_FIND_RSP : typeName = "C-FIND-RSP"; break;
case C.COMMAND_C_MOVE_RQ : typeName = "C-MOVE-RQ"; break;
case C.COMMAND_C_FIND_RQ : typeName = "C-FIND-RQ"; break;
case C.COMMAND_C_STORE_RSP : typeName = "C-STORE-RSP"; break;
}
}
typeName += " [\n";
typeName += this.printElements(this.elementPairs, 0);
typeName += "]";
return typeName;
}
DicomMessage.prototype.walkObject = function(pairs) {
var obj = {}, o = this;
for (var tag in pairs) {
var v = pairs[tag].getValue(), u = v;
if (v instanceof Array) {
u = [];
v.forEach(function(a) {
if (typeof a == 'object') {
u.push(o.walkObject(a));
} else u.push(a);
});
}
obj[tag] = u;
}
return obj;
}
DicomMessage.prototype.toObject = function() {
return this.walkObject(this.elementPairs);
}
readMessage = function(stream, type, syntax, options) {
var elements = [], pairs = {}, useSyntax = type == C.DATA_TYPE_COMMAND ? C.IMPLICIT_LITTLE_ENDIAN : syntax;
stream.reset();
while (!stream.end()) {
var elem = new DataElement();
if (options) {
elem.setOptions(options);
}
elem.setSyntax(useSyntax);
elem.readBytes(stream);//return;
pairs[elem.tag.value] = elem;
}
var message = null;
if (type == C.DATA_TYPE_COMMAND) {
var cmdType = pairs[0x00000100].value;
switch (cmdType) {
case 0x8020 : message = new CFindRSP(useSyntax); break;
case 0x8021 : message = new CMoveRSP(useSyntax); break;
case 0x8010 : message = new CGetRSP(useSyntax); break;
case 0x0001 : message = new CStoreRQ(useSyntax); break;
case 0x0020 : message = new CFindRQ(useSyntax); break;
default : throw "Unrecognized command type " + cmdType.toString(16); break;
}
message.setElementPairs(pairs);
message.setDataSetPresent(message.getValue(0x00000800));
message.setContextId(message.getValue(0x00000002));
if (!message.isResponse()) {
message.setMessageId(message.getValue(0x00000110));
} else {
message.setReplyMessageId(message.getValue(0x00000120));
}
} else if (type == C.DATA_TYPE_DATA) {
message = new DataSetMessage(useSyntax);
message.setElementPairs(pairs);
} else {
throw "Unrecognized message type";
}
return message;
}
DataSetMessage = function(syntax){
DicomMessage.call(this, syntax);
this.type = C.DATA_TYPE_DATA;
};
util.inherits(DataSetMessage, DicomMessage);
DataSetMessage.prototype.is = function(type) {
return false;
}
CommandMessage = function(syntax) {
DicomMessage.call(this, syntax);
this.type = C.DATA_TYPE_COMMAND;
this.priority = C.PRIORITY_MEDIUM;
this.dataSetPresent = true;
}
util.inherits(CommandMessage, DicomMessage);
CommandMessage.prototype.getFields = function() {
return this.command(CommandMessage.super_.prototype.getFields.call(this));
}
CommandResponse = function(syntax) {
DicomMessage.call(this, syntax);
this.type = C.DATA_TYPE_COMMAND;
this.dataSetPresent = true;
};
util.inherits(CommandResponse, DicomMessage);
CommandResponse.prototype.isResponse = function() {
return true;
}
CommandResponse.prototype.respondedTo = function() {
return this.getValue(0x00000120);
}
CommandResponse.prototype.isFinal = function() {
return this.success() || this.failure() || this.cancel();
}
CommandResponse.prototype.warning = function() {
var status = this.getStatus();
return (status == 0x0001) || (status >> 12 == 0xb);
}
CommandResponse.prototype.success = function() {
return this.getStatus() == 0x0000;
}
CommandResponse.prototype.failure = function() {
var status = this.getStatus();
return (status >> 12 == 0xa) || (status >> 12 == 0xc) || (status >> 8 == 0x1)
}
CommandResponse.prototype.cancel = function() {
return this.getStatus() == C.STATUS_CANCEL;
}
CommandResponse.prototype.pending = function() {
var status = this.getStatus();
return (status == 0xff00) || (status == 0xff01);
}
CommandResponse.prototype.getStatus = function() {
return this.getValue(0x00000900);
}
CommandResponse.prototype.setStatus = function(status) {
this.setElement(0x00000900, status);
}
// following four methods only available to C-GET-RSP and C-MOVE-RSP
CommandResponse.prototype.getNumOfRemainingSubOperations = function() {
return this.getValue(0x00001020);
}
CommandResponse.prototype.getNumOfCompletedSubOperations = function() {
return this.getValue(0x00001021);
}
CommandResponse.prototype.getNumOfFailedSubOperations = function() {
return this.getValue(0x00001022);
}
CommandResponse.prototype.getNumOfWarningSubOperations = function() {
return this.getValue(0x00001023);
}
//end
CommandResponse.prototype.getFields = function() {
return this.response(CommandResponse.super_.prototype.getFields.call(this));
}
CFindRSP = function(syntax) {
CommandResponse.call(this, syntax);
this.commandType = 0x8020;
};
util.inherits(CFindRSP, CommandResponse);
CGetRSP = function(syntax) {
CommandResponse.call(this, syntax);
this.commandType = 0x8010;
};
util.inherits(CGetRSP, CommandResponse);
CMoveRSP = function(syntax) {
CommandResponse.call(this, syntax);
this.commandType = 0x8021;
};
util.inherits(CMoveRSP, CommandResponse);
CFindRQ = function(syntax) {
CommandMessage.call(this, syntax);
this.commandType = 0x20;
this.contextUID = C.SOP_STUDY_ROOT_FIND;
};
util.inherits(CFindRQ, CommandMessage);
CMoveRQ = function(syntax, destination) {
CommandMessage.call(this, syntax);
this.commandType = 0x21;
this.contextUID = C.SOP_STUDY_ROOT_MOVE;
this.setDestination(destination || "");
};
util.inherits(CMoveRQ, CommandMessage);
CMoveRQ.prototype.setStore = function(cstr) {
this.store = cstr;
}
CMoveRQ.prototype.setDestination = function(dest) {
this.setElements({
0x00000600 : dest
});
}
CGetRQ = function(syntax) {
CommandMessage.call(this, syntax);
this.commandType = 0x10;
this.contextUID = C.SOP_STUDY_ROOT_GET;
this.store = null;
};
util.inherits(CGetRQ, CommandMessage);
CGetRQ.prototype.setStore = function(cstr) {
this.store = cstr;
}
CStoreRQ = function(syntax) {
CommandMessage.call(this, syntax);
this.commandType = 0x01;
this.contextUID = C.SOP_STUDY_ROOT_GET;
};
util.inherits(CStoreRQ, CommandMessage);
CStoreRQ.prototype.getOriginAETitle = function() {
return this.getValue(0x00001030);
}
CStoreRQ.prototype.getMoveMessageId = function() {
return this.getValue(0x00001031);
}
CStoreRQ.prototype.getSOPInstanceUID = function() {
return this.getValue(0x00001000);
}
CStoreRSP = function(syntax) {
CommandResponse.call(this, syntax);
this.commandType = 0x8001;
this.contextUID = C.SOP_STUDY_ROOT_GET;
this.dataSetPresent = false;
};
util.inherits(CStoreRSP, CommandResponse);
CStoreRSP.prototype.setAffectedSOPInstanceUID = function(uid) {
this.setElement(0x00001000, uid);
}
CStoreRSP.prototype.getAffectedSOPInstanceUID = function(uid) {
return this.getValue(0x00001000);
}

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PDU = function() {
this.fields = [];
this.lengthBytes = 4;
}
PDU.prototype.length = function(fields) {
var len = 0;
fields.forEach(function(f) {
len += !f.getFields ? f.length() : f.length(f.getFields());
});
return len;
}
PDU.prototype.is = function(type) {
return this.type == type;
}
PDU.prototype.getFields = function(fields) {
var len = this.lengthField(fields);
fields.unshift(len);
if (this.type !== null) {
fields.unshift(new ReservedField());
fields.unshift(new HexField(this.type));
}
return fields;
}
PDU.prototype.lengthField = function(fields) {
if (this.lengthBytes == 4) {
return new UInt32Field(this.length(fields));
} else if (this.lengthBytes == 2) {
return new UInt16Field(this.length(fields));
} else {
throw "Invalid length bytes";
}
}
PDU.prototype.read = function(stream) {
stream.read(C.TYPE_HEX, 1);
var length = stream.read(C.TYPE_UINT32);
this.readBytes(stream, length);
}
PDU.prototype.load = function(stream) {
return pduByStream(stream);
}
PDU.prototype.loadPDV = function(stream, length) {
if (stream.end()) return false;
var bytesRead = 0, pdvs = [];
while (bytesRead < length) {
var plength = stream.read(C.TYPE_UINT32),
pdv = new PresentationDataValueItem();
pdv.readBytes(stream, plength);
bytesRead += plength + 4;
pdvs.push(pdv);
}
return pdvs;
}
PDU.prototype.loadDicomMessage = function(stream, isCommand, isLast) {
var message = readMessage(stream, isCommand, isLast);
return message;
}
PDU.prototype.stream = function() {
var stream = new WriteStream(),
fields = this.getFields();
// writing to buffer
fields.forEach(function(field){
field.write(stream);
});
return stream;
}
PDU.prototype.buffer = function() {
return this.stream().buffer();
}
var interpretCommand = function(stream, isLast) {
parseDicomMessage(stream);
}
mergePDVs = function(pdvs) {
var merges = [], count = pdvs.length, i = 0;
while (i < count) {console.log(pdvs[i].isLast, pdvs[i].type);
if (!pdvs[i].isLast) {
var j = i;
while (!pdvs[j++].isLast && j < count) {
pdvs[i].messageStream.concat(pdvs[j].messageStream);
}
merges.push(pdvs[i]);
i = j;
} else {
merges.push(pdvs[i++]);
}
}
return merges;
}
pduByStream = function(stream) {
if (stream.end()) return null;
var pduType = stream.read(C.TYPE_HEX, 1), typeNum = parseInt(pduType, 16), pdu = null;
//console.log("RECEIVED PDU-TYPE ", pduType);
switch (typeNum) {
case 0x01 : pdu = new AssociateRQ(); break;
case 0x02 : pdu = new AssociateAC(); break;
case 0x04 : pdu = new PDataTF(); break;
case 0x06 : pdu = new ReleaseRP(); break;
case 0x07 : pdu = new AssociateAbort(); break;
case 0x10 : pdu = new ApplicationContextItem(); break;
case 0x20 : pdu = new PresentationContextItem(); break;
case 0x21 : pdu = new PresentationContextItemAC(); break;
case 0x30 : pdu = new AbstractSyntaxItem(); break;
case 0x40 : pdu = new TransferSyntaxItem(); break;
case 0x50 : pdu = new UserInformationItem(); break;
case 0x51 : pdu = new MaximumLengthItem(); break;
case 0x52 : pdu = new ImplementationClassUIDItem(); break;
case 0x55 : pdu = new ImplementationVersionNameItem(); break;
default : throw "Unrecoginized pdu type " + pduType; break;
}
if (pdu)
pdu.read(stream);
return pdu;
}
var nextItemIs = function(stream, pduType) {
if (stream.end()) return false;
var nextType = stream.read(C.TYPE_HEX, 1);
stream.increment(-1);
return pduType == nextType;
}
AssociateRQ = function() {
PDU.call(this);
this.type = C.ITEM_TYPE_PDU_ASSOCIATE_RQ;
this.protocolVersion = 1;
}
util.inherits(AssociateRQ, PDU);
AssociateRQ.prototype.setProtocolVersion = function(version) {
this.protocolVersion = version;
}
AssociateRQ.prototype.setCalledAETitle = function(title) {
this.calledAETitle = title;
}
AssociateRQ.prototype.setCallingAETitle = function(title) {
this.callingAETitle = title;
}
AssociateRQ.prototype.setApplicationContextItem = function(item) {
this.applicationContextItem = item;
}
AssociateRQ.prototype.setPresentationContextItems = function(items) {
this.presentationContextItems = items;
}
AssociateRQ.prototype.setUserInformationItem = function(item) {
this.userInformationItem = item;
}
AssociateRQ.prototype.allAccepted = function() {
for (var i in this.presentationContextItems) {
var item = this.presentationContextItems[i];
if (!item.accepted()) return false;
}
return true;
}
AssociateRQ.prototype.getFields = function() {
var f = [
new UInt16Field(this.protocolVersion), new ReservedField(2),
new FilledField(this.calledAETitle, 16), new FilledField(this.callingAETitle, 16),
new ReservedField(32), this.applicationContextItem
];
this.presentationContextItems.forEach(function(context){
f.push(context);
});
f.push(this.userInformationItem);
return AssociateRQ.super_.prototype.getFields.call(this, f);
}
AssociateRQ.prototype.readBytes = function(stream, length) {
this.type = C.ITEM_TYPE_PDU_ASSOCIATE_RQ;
var version = stream.read(C.TYPE_UINT16);
this.setProtocolVersion(version);
stream.increment(2);
var calledAE = stream.read(C.TYPE_ASCII, 16);
this.setCalledAETitle(calledAE);
var callingAE = stream.read(C.TYPE_ASCII, 16);
this.setCallingAETitle(callingAE);
stream.increment(32);
var appContext = this.load(stream);
this.setApplicationContextItem(appContext);
var presContexts = [];
do {
presContexts.push(this.load(stream));
} while (nextItemIs(stream, C.ITEM_TYPE_PRESENTATION_CONTEXT_AC));
this.setPresentationContextItems(presContexts);
var userItem = this.load(stream);
this.setUserInformationItem(userItem);
}
AssociateRQ.prototype.buffer = function() {
return AssociateRQ.super_.prototype.buffer.call(this);
}
AssociateAC = function() {
AssociateRQ.call(this);
};
util.inherits(AssociateAC, AssociateRQ);
AssociateAC.prototype.readBytes = function(stream, length) {
this.type = C.ITEM_TYPE_PDU_ASSOCIATE_AC;
var version = stream.read(C.TYPE_UINT16);
this.setProtocolVersion(version);
stream.increment(66);
var appContext = this.load(stream);
this.setApplicationContextItem(appContext);
var presContexts = [];
do {
presContexts.push(this.load(stream));
} while (nextItemIs(stream, C.ITEM_TYPE_PRESENTATION_CONTEXT_AC));
this.setPresentationContextItems(presContexts);
var userItem = this.load(stream);
this.setUserInformationItem(userItem);
}
AssociateAbort = function() {
this.type = C.ITEM_TYPE_PDU_AABORT;
this.source = 1;
this.reason = 0;
PDU.call(this);
}
util.inherits(AssociateAbort, PDU);
AssociateAbort.prototype.setSource = function(src) {
this.source = src;
}
AssociateAbort.prototype.setReason = function(reason) {
this.reason = reason;
}
AssociateAbort.prototype.readBytes = function(stream, length) {
stream.increment(2);
var source = stream.read(C.TYPE_UINT8);
this.setSource(source);
var reason = stream.read(C.TYPE_UINT8);
this.setReason(reason);
}
AssociateAbort.prototype.getFields = function() {
return AssociateAbort.super_.prototype.getFields.call(this, [
new ReservedField(), new ReservedField(),
new UInt8Field(this.source), new UInt8Field(this.reason)
]);
}
ReleaseRQ = function() {
this.type = C.ITEM_TYPE_PDU_RELEASE_RQ;
PDU.call(this);
};
util.inherits(ReleaseRQ, PDU);
ReleaseRQ.prototype.getFields = function() {
return ReleaseRQ.super_.prototype.getFields.call(this, [new ReservedField(4)]);
};
ReleaseRP = function() {
this.type = C.ITEM_TYPE_PDU_RELEASE_RP;
PDU.call(this);
}
util.inherits(ReleaseRP, PDU);
ReleaseRP.prototype.readBytes = function(stream, length) {
stream.increment(4);
};
ReleaseRP.prototype.getFields = function() {
return ReleaseRP.super_.prototype.getFields.call(this, [new ReservedField(4)]);
}
PDataTF = function() {
this.type = C.ITEM_TYPE_PDU_PDATA;
this.presentationDataValueItems = [];
PDU.call(this);
}
util.inherits(PDataTF, PDU);
PDataTF.prototype.setPresentationDataValueItems = function(items) {
this.presentationDataValueItems = items ? items : [];
}
PDataTF.prototype.getFields = function() {
var fields = this.presentationDataValueItems;
return PDataTF.super_.prototype.getFields.call(this, fields);
}
PDataTF.prototype.readBytes = function(stream, length) {
var pdvs = this.loadPDV(stream, length);
//let merges = mergePDVs(pdvs);
this.setPresentationDataValueItems(pdvs);
}
Item = function() {
PDU.call(this);
this.lengthBytes = 2;
};
util.inherits(Item, PDU);
Item.prototype.read = function(stream) {
stream.read(C.TYPE_HEX, 1);
var length = stream.read(C.TYPE_UINT16);
this.readBytes(stream, length);
}
Item.prototype.write = function(stream) {
stream.concat(this.stream());
}
Item.prototype.getFields = function(fields) {
return Item.super_.prototype.getFields.call(this, fields);
}
PresentationDataValueItem = function(context) {
this.type = null;
this.isLast = true;
this.dataFragment = null;
this.contextId = context;
this.messageStream = null;
Item.call(this);
this.lengthBytes = 4;
};
util.inherits(PresentationDataValueItem, Item);
PresentationDataValueItem.prototype.setContextId = function(id) {
this.contextId = id;
}
PresentationDataValueItem.prototype.setFlag = function(flag) {
this.flag = flag;
}
PresentationDataValueItem.prototype.setPresentationDataValue = function(pdv) {
this.pdv = pdv;
}
PresentationDataValueItem.prototype.setMessage = function(msg) {
this.dataFragment = msg;
}
PresentationDataValueItem.prototype.getMessage = function() {
return this.dataFragment;
}
PresentationDataValueItem.prototype.readBytes = function(stream, length) {
this.contextId = stream.read(C.TYPE_UINT8);
var messageHeader = stream.read(C.TYPE_UINT8);
this.isLast = messageHeader >> 1;
this.type = messageHeader & 1 ? C.DATA_TYPE_COMMAND : C.DATA_TYPE_DATA;
//load dicom messages
this.messageStream = stream.more(length - 2);
}
PresentationDataValueItem.prototype.getFields = function() {
var fields = [new UInt8Field(this.contextId)];
//define header
var messageHeader = (1 & this.dataFragment.type) | ((this.isLast ? 1 : 0) << 1);
fields.push(new UInt8Field(messageHeader));
fields.push(this.dataFragment);
/*var stream = new WriteStream();this.dataFragment.write(stream);
//var f = this.dataFragment.getFields();
//var wr = new WriteStream();f[0].setSyntax(this.dataFragment.syntax);f[0].write(wr);
var rst = stream.toReadBuffer();
rst.setEndian(C.LITTLE_ENDIAN);
var group = rst.read(C.TYPE_UINT16),
element = rst.read(C.TYPE_UINT16),
tag = tagFromNumbers(group, element);
console.log(tag.toString(), rst.read(C.TYPE_UINT32));*/
return PresentationDataValueItem.super_.prototype.getFields.call(this, fields);
}
ApplicationContextItem = function() {
this.type = C.ITEM_TYPE_APPLICATION_CONTEXT;
this.applicationContextName = C.APPLICATION_CONTEXT_NAME;
Item.call(this);
}
util.inherits(ApplicationContextItem, Item);
ApplicationContextItem.prototype.setApplicationContextName = function(name) {
this.applicationContextName = name;
}
ApplicationContextItem.prototype.getFields = function() {
return ApplicationContextItem.super_.prototype.getFields.call(this, [new StringField(this.applicationContextName)]);
}
ApplicationContextItem.prototype.readBytes = function(stream, length) {
var appContext = stream.read(C.TYPE_ASCII, length);
this.setApplicationContextName(appContext);
}
ApplicationContextItem.prototype.buffer = function() {
return ApplicationContextItem.super_.prototype.buffer.call(this);
}
PresentationContextItem = function() {
this.type = C.ITEM_TYPE_PRESENTATION_CONTEXT;
Item.call(this);
};
util.inherits(PresentationContextItem, Item);
PresentationContextItem.prototype.setPresentationContextID = function(id) {
this.presentationContextID = id;
}
PresentationContextItem.prototype.setAbstractSyntaxItem = function(item) {
this.abstractSyntaxItem = item;
}
PresentationContextItem.prototype.setTransferSyntaxesItems = function(items) {
this.transferSyntaxesItems = items;
}
PresentationContextItem.prototype.setResultReason = function(reason) {
this.resultReason = reason;
}
PresentationContextItem.prototype.accepted = function() {
return this.resultReason == 0;
}
PresentationContextItem.prototype.readBytes = function(stream, length) {
var contextId = stream.read(C.TYPE_UINT8);
this.setPresentationContextID(contextId);
stream.increment(1);
stream.increment(1);
stream.increment(1);
var abstractItem = this.load(stream);
this.setAbstractSyntaxItem(abstractItem);
var transContexts = [];
do {
transContexts.push(this.load(stream));
} while (nextItemIs(stream, C.ITEM_TYPE_TRANSFER_CONTEXT));
this.setTransferSyntaxesItems(transContexts);
}
PresentationContextItem.prototype.getFields = function() {
var f = [
new UInt8Field(this.presentationContextID),
new ReservedField(), new ReservedField(), new ReservedField(), this.abstractSyntaxItem
];
this.transferSyntaxesItems.forEach(function(syntaxItem){
f.push(syntaxItem);
});
return PresentationContextItem.super_.prototype.getFields.call(this, f);
}
PresentationContextItem.prototype.buffer = function() {
return PresentationContextItem.super_.prototype.buffer.call(this);
}
PresentationContextItemAC = function() {
this.type = C.ITEM_TYPE_PRESENTATION_CONTEXT_AC;
Item.call(this);
};
util.inherits(PresentationContextItemAC, PresentationContextItem);
PresentationContextItemAC.prototype.readBytes = function(stream, length) {
var contextId = stream.read(C.TYPE_UINT8);
this.setPresentationContextID(contextId);
stream.increment(1);
var resultReason = stream.read(C.TYPE_UINT8);
this.setResultReason(resultReason);
stream.increment(1);
var transItem = this.load(stream);
this.setTransferSyntaxesItems([transItem]);
}
AbstractSyntaxItem = function() {
this.type = C.ITEM_TYPE_ABSTRACT_CONTEXT;
Item.call(this);
}
util.inherits(AbstractSyntaxItem, Item);
AbstractSyntaxItem.prototype.setAbstractSyntaxName = function(name) {
this.abstractSyntaxName = name;
}
AbstractSyntaxItem.prototype.getFields = function() {
return AbstractSyntaxItem.super_.prototype.getFields.call(this, [new StringField(this.abstractSyntaxName)]);
}
AbstractSyntaxItem.prototype.buffer = function() {
return AbstractSyntaxItem.super_.prototype.buffer.call(this);
}
AbstractSyntaxItem.prototype.readBytes = function(stream, length) {
var name = stream.read(C.TYPE_ASCII, length);
this.setAbstractSyntaxName(name);
}
TransferSyntaxItem = function() {
this.type = C.ITEM_TYPE_TRANSFER_CONTEXT;
Item.call(this);
};
util.inherits(TransferSyntaxItem, Item);
TransferSyntaxItem.prototype.setTransferSyntaxName = function(name) {
this.transferSyntaxName = name;
}
TransferSyntaxItem.prototype.readBytes = function(stream, length) {
var transfer = stream.read(C.TYPE_ASCII, length);
this.setTransferSyntaxName(transfer);
}
TransferSyntaxItem.prototype.getFields = function() {
return TransferSyntaxItem.super_.prototype.getFields.call(this, [new StringField(this.transferSyntaxName)]);
}
TransferSyntaxItem.prototype.buffer = function() {
return TransferSyntaxItem.super_.prototype.buffer.call(this);
}
UserInformationItem = function() {
this.type = C.ITEM_TYPE_USER_INFORMATION;
Item.call(this);
};
util.inherits(UserInformationItem, Item);
UserInformationItem.prototype.setUserDataItems = function(items) {
this.userDataItems = items;
}
UserInformationItem.prototype.readBytes = function(stream, length) {
var items = [], pdu = this.load(stream);
do {
items.push(pdu);
} while (pdu = this.load(stream));
this.setUserDataItems(items);
}
UserInformationItem.prototype.getFields = function() {
var f = [];
this.userDataItems.forEach(function(userData){
f.push(userData);
});
return UserInformationItem.super_.prototype.getFields.call(this, f);
}
UserInformationItem.prototype.buffer = function() {
return UserInformationItem.super_.prototype.buffer.call(this);
}
ImplementationClassUIDItem = function() {
this.type = C.ITEM_TYPE_IMPLEMENTATION_UID;
Item.call(this);
}
util.inherits(ImplementationClassUIDItem, Item);
ImplementationClassUIDItem.prototype.setImplementationClassUID = function(id) {
this.implementationClassUID = id;
}
ImplementationClassUIDItem.prototype.readBytes = function(stream, length) {
var uid = stream.read(C.TYPE_ASCII, length);
this.setImplementationClassUID(uid);
}
ImplementationClassUIDItem.prototype.getFields = function() {
return ImplementationClassUIDItem.super_.prototype.getFields.call(this, [new StringField(this.implementationClassUID)]);
}
ImplementationClassUIDItem.prototype.buffer = function() {
return ImplementationClassUIDItem.super_.prototype.buffer.call(this);
}
ImplementationVersionNameItem = function() {
this.type = C.ITEM_TYPE_IMPLEMENTATION_VERSION;
Item.call(this);
}
util.inherits(ImplementationVersionNameItem, Item);
ImplementationVersionNameItem.prototype.setImplementationVersionName = function(name) {
this.implementationVersionName = name;
}
ImplementationVersionNameItem.prototype.readBytes = function(stream, length) {
var name = stream.read(C.TYPE_ASCII, length);
this.setImplementationVersionName(name);
}
ImplementationVersionNameItem.prototype.getFields = function() {
return ImplementationVersionNameItem.super_.prototype.getFields.call(this, [new StringField(this.implementationVersionName)]);
}
ImplementationVersionNameItem.prototype.buffer = function() {
return ImplementationVersionNameItem.super_.prototype.buffer.call(this);
}
MaximumLengthItem = function() {
this.type = C.ITEM_TYPE_MAXIMUM_LENGTH;
this.maximumLengthReceived = 32768;
Item.call(this);
}
util.inherits(MaximumLengthItem, Item);
MaximumLengthItem.prototype.setMaximumLengthReceived = function(length) {
this.maximumLengthReceived = length;
}
MaximumLengthItem.prototype.readBytes = function(stream, length) {
var l = stream.read(C.TYPE_UINT32);
this.setMaximumLengthReceived(l);
}
MaximumLengthItem.prototype.getFields = function() {
return MaximumLengthItem.super_.prototype.getFields.call(this, [new UInt32Field(this.maximumLengthReceived)]);
}
MaximumLengthItem.prototype.buffer = function() {
return MaximumLengthItem.super_.prototype.buffer.call(this);
}

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var isString = function(type) {
if (type == C.TYPE_ASCII || type == C.TYPE_HEX) {
return true;
} else return false;
};
calcLength = function(type, value) {
var size = NaN;
switch (type) {
case C.TYPE_HEX : size = Buffer.byteLength(value, 'hex'); break;
case C.TYPE_ASCII : size = Buffer.byteLength(value, 'ascii'); break;
case C.TYPE_UINT8 : size = 1; break;
case C.TYPE_UINT16 : size = 2; break;
case C.TYPE_UINT32 : size = 4; break;
case C.TYPE_FLOAT : size = 4; break;
case C.TYPE_DOUBLE : size = 8; break;
case C.TYPE_INT8 : size = 1; break;
case C.TYPE_INT16 : size = 2; break;
case C.TYPE_INT32 : size = 4; break;
default :break;
}
return size;
}
var RWStream = function() {
this.endian = C.BIG_ENDIAN;
};
RWStream.prototype.setEndian = function(endian) {
this.endian = endian;
}
RWStream.prototype.getEncoding = function(type) {
return RWStream.encodings[type];
}
RWStream.prototype.getWriteType = function(type) {
return RWStream.writes[this.endian][type];
}
RWStream.prototype.getReadType = function(type) {
return RWStream.reads[this.endian][type];
}
WriteStream = function() {
RWStream.call(this);
this.defaultBufferSize = 512; //512 bytes
this.rawBuffer = new Buffer(this.defaultBufferSize);
this.offset = 0;
this.contentSize = 0;
}
util.inherits(WriteStream, RWStream);
WriteStream.prototype.increment = function(add) {
this.offset += add;
if (this.offset > this.contentSize) {
this.contentSize = this.offset;
}
}
WriteStream.prototype.size = function() {
return this.contentSize;
}
WriteStream.prototype.skip = function(amount) {
this.increment(amount);
}
WriteStream.prototype.checkSize = function(length) {
if (this.offset + length > this.rawBuffer.length) {
// we need more size, copying old one to new buffer
var oldLength = this.rawBuffer.length,
newBuffer = new Buffer(oldLength + length + (oldLength / 2));
this.rawBuffer.copy(newBuffer, 0, 0, this.contentSize);
this.rawBuffer = newBuffer;
}
}
WriteStream.prototype.writeToBuffer = function(type, value, length) {
if (value === "" || value === null) return;
this.checkSize(length);
this.rawBuffer[this.getWriteType(type)](value, this.offset);
this.increment(length);
}
WriteStream.prototype.write = function(type, value) {
if (isString(type)) {
this.writeString(value, type);
} else {
this.writeToBuffer(type, value, calcLength(type));
}
}
WriteStream.prototype.writeString = function(string, type) {
var encoding = this.getEncoding(type), length = Buffer.byteLength(string, encoding);
this.rawBuffer.write(string, this.offset, length, encoding);
this.increment(length);
}
WriteStream.prototype.buffer = function() {
return this.rawBuffer.slice(0, this.contentSize);
}
WriteStream.prototype.toReadBuffer = function() {
return new ReadStream(this.buffer());
}
WriteStream.prototype.concat = function(newStream) {
var newSize = this.size() + newStream.size();
this.rawBuffer = Buffer.concat([this.buffer(), newStream.buffer()], newSize);
this.contentSize = newSize;
this.offset = newSize;
}
ReadStream = function(buffer) {
RWStream.call(this);
this.rawBuffer = buffer;
this.offset = 0;
};
util.inherits(ReadStream, RWStream);
ReadStream.prototype.size = function() {
return this.rawBuffer.length;
}
ReadStream.prototype.increment = function(add) {
this.offset += add;
}
ReadStream.prototype.more = function(length) {
var newBuf = this.rawBuffer.slice(this.offset, this.offset + length);
this.increment(length);
return new ReadStream(newBuf);
}
ReadStream.prototype.reset = function() {
this.offset = 0;
return this;
}
ReadStream.prototype.end = function() {
return this.offset >= this.size();
}
ReadStream.prototype.readFromBuffer = function(type, length) {
//this.checkSize(length);
//if (this.offset + length > this.rawBuffer.length) throw ("out of bound " + this.offset + "," + length + "," + this.rawBuffer.length);
var value = this.rawBuffer[this.getReadType(type)](this.offset);
this.increment(length);
return value;
}
ReadStream.prototype.read = function(type, length) {
var value = null;
if (isString(type)) {
value = this.readString(length, type);
} else {
value = this.readFromBuffer(type, calcLength(type));
}
return value;
}
ReadStream.prototype.readString = function(length, type) {
var encoding = this.getEncoding(type),
str = this.rawBuffer.toString(encoding, this.offset, this.offset + length);
this.increment(length);
return str;
}
ReadStream.prototype.buffer = function() {
return this.rawBuffer;
}
ReadStream.prototype.concat = function(newStream) {
var newSize = this.size() + newStream.size();
this.rawBuffer = Buffer.concat([this.buffer(), newStream.buffer()], newSize);
this.contentSize = newSize;
this.offset = newSize;
}
RWStream.writes = {};
RWStream.writes[C.BIG_ENDIAN] = {};
RWStream.writes[C.BIG_ENDIAN][C.TYPE_UINT8] = "writeUInt8";
RWStream.writes[C.BIG_ENDIAN][C.TYPE_UINT16] = "writeUInt16BE";
RWStream.writes[C.BIG_ENDIAN][C.TYPE_UINT32] = "writeUInt32BE";
RWStream.writes[C.BIG_ENDIAN][C.TYPE_INT8] = "writeInt8";
RWStream.writes[C.BIG_ENDIAN][C.TYPE_INT16] = "writeInt16BE";
RWStream.writes[C.BIG_ENDIAN][C.TYPE_INT32] = "writeInt32BE";
RWStream.writes[C.BIG_ENDIAN][C.TYPE_FLOAT] = "writeFloatBE";
RWStream.writes[C.BIG_ENDIAN][C.TYPE_DOUBLE] = "writeDoubleBE";
RWStream.writes[C.LITTLE_ENDIAN] = {};
RWStream.writes[C.LITTLE_ENDIAN][C.TYPE_UINT8] = "writeUInt8";
RWStream.writes[C.LITTLE_ENDIAN][C.TYPE_UINT16] = "writeUInt16LE";
RWStream.writes[C.LITTLE_ENDIAN][C.TYPE_UINT32] = "writeUInt32LE";
RWStream.writes[C.LITTLE_ENDIAN][C.TYPE_INT8] = "writeInt8";
RWStream.writes[C.LITTLE_ENDIAN][C.TYPE_INT16] = "writeInt16LE";
RWStream.writes[C.LITTLE_ENDIAN][C.TYPE_INT32] = "writeInt32LE";
RWStream.writes[C.LITTLE_ENDIAN][C.TYPE_FLOAT] = "writeFloatLE";
RWStream.writes[C.LITTLE_ENDIAN][C.TYPE_DOUBLE] = "writeDoubleLE";
RWStream.reads = {};
RWStream.reads[C.BIG_ENDIAN] = {};
RWStream.reads[C.BIG_ENDIAN][C.TYPE_UINT8] = "readUInt8";
RWStream.reads[C.BIG_ENDIAN][C.TYPE_UINT16] = "readUInt16BE";
RWStream.reads[C.BIG_ENDIAN][C.TYPE_UINT32] = "readUInt32BE";
RWStream.reads[C.BIG_ENDIAN][C.TYPE_INT8] = "readInt8";
RWStream.reads[C.BIG_ENDIAN][C.TYPE_INT16] = "readInt16BE";
RWStream.reads[C.BIG_ENDIAN][C.TYPE_INT32] = "readInt32BE";
RWStream.reads[C.BIG_ENDIAN][C.TYPE_FLOAT] = "readFloatBE";
RWStream.reads[C.BIG_ENDIAN][C.TYPE_DOUBLE] = "readDoubleBE";
RWStream.reads[C.LITTLE_ENDIAN] = {};
RWStream.reads[C.LITTLE_ENDIAN][C.TYPE_UINT8] = "readUInt8";
RWStream.reads[C.LITTLE_ENDIAN][C.TYPE_UINT16] = "readUInt16LE";
RWStream.reads[C.LITTLE_ENDIAN][C.TYPE_UINT32] = "readUInt32LE";
RWStream.reads[C.LITTLE_ENDIAN][C.TYPE_INT8] = "readInt8";
RWStream.reads[C.LITTLE_ENDIAN][C.TYPE_INT16] = "readInt16LE";
RWStream.reads[C.LITTLE_ENDIAN][C.TYPE_INT32] = "readInt32LE";
RWStream.reads[C.LITTLE_ENDIAN][C.TYPE_FLOAT] = "readFloatLE";
RWStream.reads[C.LITTLE_ENDIAN][C.TYPE_DOUBLE] = "readDoubleLE";
RWStream.encodings = {};
RWStream.encodings[C.TYPE_HEX] = "hex";
RWStream.encodings[C.TYPE_ASCII] = "ascii";

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C = {
IMPLEM_UID : "1.2.840.0.1.3680045.8.641",
IMPLEM_VERSION : "OHIF-DCM-0.1",
APPLICATION_CONTEXT_NAME : "1.2.840.10008.3.1.1.1",
PROTOCOL_VERSION : "0001",
ITEM_TYPE_RESERVED : "00",
ITEM_TYPE_APPLICATION_CONTEXT : "10",
ITEM_TYPE_PDU_ASSOCIATE_RQ : "01",
ITEM_TYPE_PDU_ASSOCIATE_AC : "02",
ITEM_TYPE_PDU_PDATA : "04",
ITEM_TYPE_PDU_RELEASE_RQ : "05",
ITEM_TYPE_PDU_RELEASE_RP : "06",
ITEM_TYPE_PDU_AABORT : "07",
ITEM_TYPE_PRESENTATION_CONTEXT : "20",
ITEM_TYPE_PRESENTATION_CONTEXT_AC : "21",
ITEM_TYPE_ABSTRACT_CONTEXT : "30",
ITEM_TYPE_TRANSFER_CONTEXT : "40",
ITEM_TYPE_USER_INFORMATION : "50",
ITEM_TYPE_MAXIMUM_LENGTH : "51",
ITEM_TYPE_IMPLEMENTATION_UID : "52",
ITEM_TYPE_IMPLEMENTATION_VERSION : "55",
IMPLICIT_LITTLE_ENDIAN : "1.2.840.10008.1.2",
EXPLICIT_LITTLE_ENDIAN : "1.2.840.10008.1.2.1",
EXPLICIT_BIG_ENDIAN : "1.2.840.10008.1.2.2",
SOP_PATIENT_ROOT_FIND : "1.2.840.10008.5.1.4.1.2.1.1",
SOP_PATIENT_ROOT_MOVE : "1.2.840.10008.5.1.4.1.2.1.2",
SOP_PATIENT_ROOT_GET : "1.2.840.10008.5.1.4.1.2.1.3",
SOP_STUDY_ROOT_FIND : "1.2.840.10008.5.1.4.1.2.2.1",
SOP_STUDY_ROOT_MOVE : "1.2.840.10008.5.1.4.1.2.2.2",
SOP_STUDY_ROOT_GET : "1.2.840.10008.5.1.4.1.2.2.3",
SOP_VERIFICATION : "1.2.840.10008.1.1",
SOP_HANGING_PROTOCOL_FIND : "1.2.840.10008.5.1.4.38.2",
SOP_MR_IMAGE_STORAGE : "1.2.840.10008.5.1.4.1.1.4",
TYPE_ASCII : 1,
TYPE_HEX : 2,
TYPE_UINT8 : 3,
TYPE_UINT16 : 4,
TYPE_UINT32 : 5,
TYPE_COMPOSITE : 6,
TYPE_FLOAT : 7,
TYPE_DOUBLE : 8,
TYPE_INT8 : 9,
TYPE_INT16 : 10,
TYPE_INT32 : 11,
RESULT_REASON_ACCEPTANCE : 0,
RESULT_REASON_USER_REJECTION : 1,
RESULT_REASON_NO_REASON :2,
RESULT_REASON_ABSTRACT_NOT_SUPPORTED : 3,
RESULT_REASON_TRANSFER_NOT_SUPPORTED : 4,
DEFAULT_MESSAGE_ID : 1,
LITTLE_ENDIAN : 1,
BIG_ENDIAN : 2,
VM_SINGLE :1,
VM_TWO : 3,
VM_THREE : 4,
VM_FOUR : 5,
VM_1N : 6,
VM_2N :7,
VM_3N :8,
VM_6N :9,
VM_3_3N : 10,
VM_2_2N : 11,
VM_16 : 12,
VM_1_2 : 13,
VM_1_3 : 18,
VM_SIX : 14,
VM_NINE : 15,
VM_1_32 : 16,
VM_1_99 : 17,
PRIORITY_LOW : 0x2,
PRIORITY_MEDIUM : 0x0,
PRIORITY_HIGH : 0x1,
DATA_SET_PRESENT : 1,
DATE_SET_ABSENCE : 0x0101,
DATA_TYPE_COMMAND : 1,
DATA_TYPE_DATA : 0,
DATA_IS_LAST : 1,
DATA_NOT_LAST : 0,
SOURCE_SERVICE_USER : 0,
SOURCE_SERVICE_PROVIDER : 2,
QUERY_RETRIEVE_LEVEL_PATIENT : "PATIENT",
QUERY_RETRIEVE_LEVEL_STUDY : "STUDY",
QUERY_RETRIEVE_LEVEL_SERIES : "SERIES",
QUERY_RETRIEVE_LEVEL_IMAGE : "IMAGE",
VALUE_LENGTH_UNDEFINED : 0xffffffff,
STATUS_SUCCESS : 0x0000,
STATUS_CANCEL : 0xfe00,
STATUS_CFIND_CONT_OK : 0xff00,
STATUS_CFIND_CONT_WARN : 0xff01,
COMMAND_C_GET_RSP : 0x8010,
COMMAND_C_MOVE_RSP : 0x8021,
COMMAND_C_GET_RQ : 0x10,
COMMAND_C_STORE_RQ : 0x01,
COMMAND_C_FIND_RSP : 0x8020,
COMMAND_C_MOVE_RQ : 0x21,
COMMAND_C_FIND_RQ : 0x20,
COMMAND_C_STORE_RSP : 0x8001
};

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Meteor.methods({
});

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util = Npm.require("util");