TypeScript BinaryStream.readUInt32方法代码示例

export function decodeExtensionObject(stream: BinaryStream): ExtensionObject | null {

    const nodeId = decodeNodeId(stream);
    const encodingType = stream.readUInt8();

    if (encodingType === 0) {
        return null;
    }

    const length = stream.readUInt32();

    /* istanbul ignore next */
    if (nodeId.value === 0 || encodingType === 0) {
        return {} as ExtensionObject;
    }

    // let verify that  decode will use the expected number of bytes
    const streamLengthBefore = stream.length;

    let object: any;
    if (nodeId.namespace !== 0) {
        // this is a extension object define in a other namespace
        // we can only threat it as an opaque object for the time being
        // the caller that may now more about the namespace Array and type
        // definition will be able to turn the opaque object into a meaningful
        // structure
        // lets rewind before the length
        stream.length -= 4;
        object = new OpaqueStructure(nodeId, stream.readByteStream()!);

    } else {
        object = constructEmptyExtensionObject(nodeId);
        /* istanbul ignore next */
        if (object === null) {
            // this object is unknown to us ..
            stream.length += length;
            object = {} as ExtensionObject;
        } else {
            try {
                object.decode(stream);
            } catch (err) {
                debugLog("Cannot decode object ", err.message);
            }
        }
    }

    if (streamLengthBefore + length !== stream.length) {
        // this may happen if the server or client do have a different OPCUA version
        // for instance SubscriptionDiagnostics structure has been changed between OPCUA version 1.01 and 1.04
        // causing 2 extra member to be added.
        debugLog(chalk.bgWhiteBright.red("========================================="));

        // tslint:disable-next-line:no-console
        console.warn("WARNING => Extension object decoding error on ",
          object.constructor.name, " expected size was", length,
          "but only this amount of bytes have been read :", stream.length - streamLengthBefore);
        stream.length = streamLengthBefore + length;
    }
    return object;
}

export function messageHeaderToString(messageChunk: Buffer): string {

    const stream = new BinaryStream(messageChunk);

    const messageHeader = readMessageHeader(stream);
    if (messageHeader.msgType === "ERR" || messageHeader.msgType === "HEL") {
        return messageHeader.msgType + " " + messageHeader.isFinal + " length   = " + messageHeader.length;
    }

    const securityHeader = chooseSecurityHeader(messageHeader.msgType);

    const sequenceHeader = new SequenceHeader();
    assert(stream.length === 8);

    const channelId = stream.readUInt32();
    securityHeader.decode(stream);
    sequenceHeader.decode(stream);

    const slice = messageChunk.slice(0, stream.length);

    return messageHeader.msgType + " " +
        messageHeader.isFinal +
        " length   = " + messageHeader.length +
        " channel  = " + channelId +
        " seqNum   = " + sequenceHeader.sequenceNumber +
        " req ID   = " + sequenceHeader.requestId +
        " security   = " + securityHeader.toString() +
        "\n\n" + hexDump(slice);
}

export function readMessageHeader(stream: BinaryStream): MessageHeader {

    const msgType = String.fromCharCode(stream.readUInt8()) +
        String.fromCharCode(stream.readUInt8()) +
        String.fromCharCode(stream.readUInt8());

    const isFinal = String.fromCharCode(stream.readUInt8());
    const length = stream.readUInt32();
    return {msgType, isFinal, length};
}

export function decodeArray(stream: BinaryStream, decodeElementFunc: (stream: BinaryStream) => any): any[] | null {
    const length = stream.readUInt32();
    if (length === 0xffffffff) {
        return null;
    }
    const arr = [];
    for (let i = 0; i < length; i++) {
        arr.push(decodeElementFunc(stream));
    }
    return arr;
}

    protected _read_headers(binaryStream: BinaryStream): boolean {

        this.messageHeader = readMessageHeader(binaryStream);
        assert(binaryStream.length === 8, "expecting message header to be 8 bytes");

        this.channelId = binaryStream.readUInt32();
        assert(binaryStream.length === 12);

        // verifying secure ChannelId
        if (this._expectedChannelId && this.channelId !== this._expectedChannelId) {
            return this._report_error("Invalid secure channel Id");
        }
        return true;
    }

function _decodeNodeId(encodingByte: number, stream: BinaryStream): NodeId {
    let value;
    let namespace;
    let nodeIdType;
    /*jslint bitwise: true */
    encodingByte &= 0x3f; // 1 to 5

    switch (encodingByte) {
        case EnumNodeIdEncoding.TwoBytes:
            value = stream.readUInt8();
            nodeIdType = NodeIdType.NUMERIC;
            break;
        case EnumNodeIdEncoding.FourBytes:
            namespace = stream.readUInt8();
            value = stream.readUInt16();
            nodeIdType = NodeIdType.NUMERIC;
            break;
        case EnumNodeIdEncoding.Numeric:
            namespace = stream.readUInt16();
            value = stream.readUInt32();
            nodeIdType = NodeIdType.NUMERIC;
            break;
        case EnumNodeIdEncoding.String:
            namespace = stream.readUInt16();
            value = decodeString(stream);
            nodeIdType = NodeIdType.STRING;
            break;
        case EnumNodeIdEncoding.ByteString:
            namespace = stream.readUInt16();
            value = decodeByteString(stream);
            nodeIdType = NodeIdType.BYTESTRING;
            break;
        default:
            if (encodingByte !== EnumNodeIdEncoding.Guid) {
                /*jslint bitwise: true */
                // console.log(" encoding_byte = 0x" + encodingByte.toString(16),
                //     " bin=", ("0000000000000000" + encodingByte.toString(2)).substr(-16),
                //     encodingByte, encodingByte & 0x3f);

                throw new Error(" encoding_byte = " + encodingByte.toString(16));
            }
            namespace = stream.readUInt16();
            value = decodeGuid(stream);
            nodeIdType = NodeIdType.GUID;
            assert(isValidGuid(value));
            break;
    }
    return new NodeId(nodeIdType, value, namespace);
}

function decode_array(
  fun_decode_element: (stream: BinaryStream) => any,
  arr: any[],
  stream: BinaryStream
): any[] | null {
    const n = stream.readUInt32();
    if (n === 0xFFFFFFFF) {
        return null;
    }
    const result = [];
    for (let i = 0; i < n; i++) {
        result.push(fun_decode_element(stream));
    }
    return result;
}

    /**
     * @method decodeDebug
     *
     */
    public decodeDebug(stream: BinaryStream, options: DecodeDebugOptions): void {

        const tracer = options.tracer;
        const schema = this.schema;

        tracer.trace("start", options.name + "(" + schema.name + ")", stream.length, stream.length);
        const self: any = this as any;

        for (const field of schema.fields) {

            const value = self[field.name];

            if (field.isArray) {

                const cursorBefore = stream.length;
                let nb = stream.readUInt32();
                if (nb === 0xFFFFFFFF) {
                    nb = 0;
                }
                options.name = field.name + [];

                tracer.trace("start_array", field.name, nb, cursorBefore, stream.length);
                for (let i = 0; i < nb; i++) {
                    tracer.trace("start_element", field.name, i);
                    options.name = "element #" + i;

                    _decode_member_(value, field, stream, options);

                    tracer.trace("end_element", field.name, i);

                }
                tracer.trace("end_array", field.name, stream.length - 4);
            } else {

                options.name = field.name;
                _decode_member_(value, field, stream, options);

            }

        }

        tracer.trace("end", schema.name, stream.length, stream.length);
    }

 function read_UInt32() {
     return toHex(stream.readUInt32(), 8);
 }

export function decodeTimestampsToReturn(stream: BinaryStream): TimestampsToReturn {
    return clamp(TimestampsToReturn.Source, stream.readUInt32(), TimestampsToReturn.Invalid) as TimestampsToReturn;
}