/**
 * RTF Document Processor
 *
 * Processes Rich Text Format (.rtf) files by extracting plain text content
 * from RTF control codes. Uses a lightweight text extraction approach
 * without requiring external dependencies.
 *
 * Key features:
 * - RTF control code stripping
 * - Text content extraction
 * - Raw content preservation for debugging
 * - No external dependencies required
 *
 * Priority: ~110 (document format, processed after binary formats)
 *
 * @module processors/document/RtfProcessor
 *
 * @example
 * ```typescript
 * import { rtfProcessor, processRtf, isRtfFile } from "./document/index.js";
 *
 * // Check if a file is an RTF file
 * if (isRtfFile("application/rtf", "document.rtf")) {
 *   const result = await processRtf({
 *     id: "file-123",
 *     name: "document.rtf",
 *     mimetype: "application/rtf",
 *     size: 10240,
 *     buffer: rtfBuffer,
 *   });
 *
 *   if (result.success) {
 *     console.log(`Text content: ${result.data.textContent}`);
 *   }
 * }
 * ```
 */
import { BaseFileProcessor } from "../base/BaseFileProcessor.js";
import type { FileInfo, ProcessorFileProcessingResult, ProcessOptions, ProcessedRtf } from "../../types/index.js";
/**
 * RTF Processor - handles Rich Text Format files.
 *
 * Extracts plain text from RTF documents by stripping RTF control codes.
 * This is a lightweight implementation that doesn't require external
 * RTF parsing libraries.
 *
 * Priority: ~110 (document format)
 *
 * @example
 * ```typescript
 * const processor = new RtfProcessor();
 *
 * const result = await processor.processFile({
 *   id: "file-123",
 *   name: "report.rtf",
 *   mimetype: "application/rtf",
 *   size: 5120,
 *   buffer: rtfBuffer,
 * });
 *
 * if (result.success) {
 *   console.log("Extracted text:", result.data.textContent);
 * }
 * ```
 */
export declare class RtfProcessor extends BaseFileProcessor<ProcessedRtf> {
    constructor();
    /**
     * Validate downloaded RTF document.
     * Checks for RTF header signature "{\\rtf".
     *
     * @param buffer - Downloaded file content
     * @param fileInfo - Original file information
     * @returns null if valid, error message if invalid
     */
    protected validateDownloadedFile(buffer: Buffer, _fileInfo: FileInfo): Promise<string | null>;
    /**
     * Build the processed RTF result.
     * Extracts plain text by stripping RTF control codes.
     *
     * @param buffer - Raw file content
     * @param fileInfo - Original file information
     * @returns Processed RTF with extracted text content
     */
    protected buildProcessedResult(buffer: Buffer, fileInfo: FileInfo): ProcessedRtf;
    /**
     * Extract plain text from RTF content.
     * Strips RTF control codes, groups, and formatting commands.
     *
     * This is a basic RTF parser that handles common RTF constructs:
     * - Control groups like {\fonttbl...}
     * - Control words like \par, \b, \i
     * - Special characters like \' hex escapes
     * - Newlines from \par and \line commands
     *
     * @param rtf - Raw RTF content
     * @returns Extracted plain text
     */
    private extractText;
}
/**
 * Singleton instance of the RtfProcessor.
 * Use this for all RTF document processing to share configuration.
 */
export declare const rtfProcessor: RtfProcessor;
/**
 * Check if a file is an RTF document.
 *
 * @param mimetype - MIME type of the file
 * @param filename - Filename for detection
 * @returns true if the file is a supported RTF document
 *
 * @example
 * ```typescript
 * if (isRtfFile("application/rtf", "document.rtf")) {
 *   console.log("This is an RTF document");
 * }
 * ```
 */
export declare function isRtfFile(mimetype: string, filename: string): boolean;
/**
 * Validate RTF document size against configured limit.
 *
 * @param sizeBytes - File size in bytes
 * @returns true if size is within the allowed limit
 */
export declare function validateRtfSize(sizeBytes: number): boolean;
/**
 * Process an RTF document.
 *
 * @param fileInfo - File information (can include URL or buffer)
 * @param options - Optional processing options
 * @returns Processing result with success flag and either data or error
 *
 * @example
 * ```typescript
 * const result = await processRtf({
 *   id: "file-123",
 *   name: "report.rtf",
 *   mimetype: "application/rtf",
 *   size: 10240,
 *   buffer: rtfBuffer,
 * });
 *
 * if (result.success) {
 *   console.log("Extracted text:", result.data.textContent);
 * }
 * ```
 */
export declare function processRtf(fileInfo: FileInfo, options?: ProcessOptions): Promise<ProcessorFileProcessingResult<ProcessedRtf>>;