/** @format */
import { InputBuffer } from '../common/input-buffer.js';
import { MemoryImage } from '../image/image.js';
import { Decoder, DecoderDecodeOptions } from './decoder.js';
import { ImageFormat } from './image-format.js';
import { PnmInfo } from './pnm/pnm-info.js';
/**
 * Decode a PNM image.
 */
export declare class PnmDecoder implements Decoder {
    /**
     * Input buffer for the PNM decoder.
     */
    private _input?;
    /**
     * Gets the input buffer.
     * @returns {InputBuffer<Uint8Array> | undefined} The input buffer or undefined if not set.
     */
    get input(): InputBuffer<Uint8Array> | undefined;
    /**
     * Information about the PNM image.
     */
    private _info?;
    /**
     * Gets the PNM image information.
     * @returns {PnmInfo | undefined} The PNM image information or undefined if not set.
     */
    get info(): PnmInfo | undefined;
    /**
     * Gets the image format.
     * @returns {ImageFormat} The image format.
     */
    get format(): ImageFormat;
    /**
     * Gets the number of frames in the image.
     * @returns {number} The number of frames.
     */
    get numFrames(): number;
    /**
     * Tokens for parsing the PNM image.
     */
    private _tokens;
    /**
     * Gets the next token from the input buffer.
     * @returns {string} The next token as a string.
     */
    private getNextToken;
    /**
     * Parses the next integer from the input buffer.
     * @returns {number} The next integer.
     */
    private parseNextInt;
    /**
     * Determines the format based on the maximum value.
     * @param {number} maxValue The maximum value.
     * @returns {Format} The format.
     */
    private formatFromMaxValue;
    /**
     * Reads a value from the input buffer based on the format.
     * @param {PnmFormat} format The PNM format.
     * @param {number} _maxValue The maximum value.
     * @returns {number} The read value.
     */
    private readValue;
    /**
     * Checks if the given file is a valid PNM image.
     * @param {Uint8Array} bytes The file bytes.
     * @returns {boolean} True if the file is a valid PNM image, otherwise false.
     */
    isValidFile(bytes: Uint8Array): boolean;
    /**
     * Starts decoding the PNM image.
     * @param {Uint8Array} bytes The file bytes.
     * @returns {PnmInfo | undefined} The PNM image information or undefined if decoding fails.
     */
    startDecode(bytes: Uint8Array): PnmInfo | undefined;
    /**
     * Decodes the PNM image.
     * @param {DecoderDecodeOptions} opt The decode options.
     * @param {Uint8Array} opt.bytes The file bytes.
     * @param {number} [opt.frameIndex] The frame index (optional).
     * @returns {MemoryImage | undefined} The decoded image or undefined if decoding fails.
     */
    decode(opt: DecoderDecodeOptions): MemoryImage | undefined;
    /**
     * Decodes a specific frame of the PNM image.
     * @param {number} _frameIndex The frame index.
     * @returns {MemoryImage | undefined} The decoded image or undefined if decoding fails.
     */
    decodeFrame(_frameIndex: number): MemoryImage | undefined;
}