/**
 * M3U Input Sanitization Utilities
 *
 * Provides functions to sanitize and validate M3U playlist content
 * to prevent injection attacks, XSS, and other security vulnerabilities.
 */
/**
 * Sanitize a URL string
 * @param url - URL to sanitize
 * @returns Sanitized URL or null if invalid
 */
export declare function sanitizeUrl(url: string): string | null;
/**
 * Sanitize a string (channel names, categories, etc.)
 * @param str - String to sanitize
 * @param maxLength - Maximum allowed length (default: MAX_NAME_LENGTH)
 * @returns Sanitized string or null if invalid
 */
export declare function sanitizeString(str: string, maxLength?: number): string | null;
/**
 * Validate M3U structure
 * @param content - M3U content to validate
 * @returns Object with isValid flag and error message if invalid
 */
export declare function validateM3UStructure(content: string): {
    isValid: boolean;
    error?: string;
};
/**
 * Count channels in M3U content (rough estimate)
 * @param content - M3U content
 * @returns Number of channel entries found
 */
export declare function countChannels(content: string): number;
/**
 * Validate channel count
 * @param count - Number of channels
 * @returns true if count is within limits
 */
export declare function validateChannelCount(count: number): boolean;
/**
 * Sanitize category/group-title string
 * @param category - Category string to sanitize
 * @returns Sanitized category or null if invalid
 */
export declare function sanitizeCategory(category: string): string | null;
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