/** Convert 8 SAS-transport (IBM) bytes to 8 big-endian IEEE-754 bytes. */
export declare function xptToIeeeBytes(xport: Uint8Array): Uint8Array;
/** Convert 8 big-endian IEEE-754 bytes to 8 SAS-transport (IBM) bytes. */
export declare function ieeeToXptBytes(ieee: Uint8Array): Uint8Array;
/** Read an XPORT double, returning the value plus any SAS missing tag. */
export declare function xptToDouble(xport: Uint8Array, off?: number): {
    value: number;
    missing: boolean;
    tag: string;
};
/** Encode a JS double as 8 XPORT bytes. */
export declare function doubleToXpt(value: number): Uint8Array;