import { _PdfDecodeStream } from '../decode-stream';
/**
 * Decodes ASCII hexadecimal encoded data from an underlying byte stream into binary content.
 *
 * @private
 */
export declare class _PdfAsciiHexStream extends _PdfDecodeStream {
    stream: any;
    firstDigit: number;
    constructor(str: any, maybeLength?: number);
    readBlock(): void;
}