import * as mqtt5_packet from '../../common/mqtt5_packet';
import * as mqtt5_common from "../../common/mqtt5";
import * as mqtt_shared from "../../common/mqtt_shared";
import * as model from "./model";
/**
 * This module contains three validation suites needed by the client implementation:
 *
 * 1. Validation of user-submitted outbound packets at submission time.  This checks all public fields for valid
 *    types, values, and ranges.
 * 2. Validation of internal outbound packets prior to encoding.  This checks constraints on internally managed fields
 *    like packetId.  It also checks constraints that can change across separate connection (maximum qos, for example).
 * 3. Protocol-error validation of inbound packets from the server.  This primarily checks protocol constraints
 *    and enumerated values.  We don't validate against negotiated settings because the server breaking that contract
 *    isn't really a fatal flaw.  In that case, it's better to be forgiving.
 *
 * Validation differs slightly based on what protocol level is being used (primarily reason codes).  It is not
 * considered a validation error to have 5-only fields set while operating in 311; the additional fields are just
 * ignored.
 *
 * Validation failure is indicated by throwing a CrtError.
 *
 * There are a few validation checks that are done outside this module.  Validation of binary properties that
 * are lost on decoding (certain bits not set) is done in the decoder.  Validation of maximum packet size constraints
 * is done in the encoder (NYI though).
 *
 * We also skip validation of certain fields that are not relevant in the particular use case.  For example, we don't
 * validate subscription identifiers on outbound publishes because that field is ignored when converting the
 * submitted packet into the internal model.
 */
export declare function validateInitialOutboundPacket(packet: mqtt5_packet.IPacket, mode: mqtt_shared.ProtocolMode): void;
export declare function validateBinaryOutboundPacket(packet: model.IPacketBinary, mode: mqtt_shared.ProtocolMode, settings: mqtt5_common.NegotiatedSettings): void;
export declare function validateInboundPacket(packet: mqtt5_packet.IPacket, mode: mqtt_shared.ProtocolMode): void;
export declare function validateU16(value: number, fieldName: string): void;
export declare function validateOptionalU32(value: number | undefined, fieldName: string): void;
export declare function validateUnsignedInteger(value: number, fieldName: string): void;
export declare function validateOptionalUnsignedInteger(value: number | undefined, fieldName: string): void;
export declare function validateOptionalPositiveU32(value: number | undefined, fieldName: string): void;
export declare function validateOptionalString(value: string | undefined, fieldName: string): void;
export declare function validateUserProperties(userProperties: Array<mqtt5_packet.UserProperty> | undefined): void;
export declare function validateOptionalBinaryData(value: mqtt5_packet.BinaryData | undefined, fieldName: string): void;