export declare const POR_LINE_LENGTH = 80;
export declare const POR_ASCII_LOOKUP: number[];
export declare const POR_UNICODE_LOOKUP: number[];
/** Combined lookup used for reading: prefer the ASCII value, else Unicode. */
export declare const POR_COMBINED_LOOKUP: number[];
/** Decode POR file bytes into a JS string via a byte->codepoint table. */
export declare function porDecode(bytes: Uint8Array, len: number, byte2unicode: number[]): string | null;
export interface PorDoubleResult {
    value: number;
    consumed: number;
}
/**
 * Parse a base-30 encoded double (port of readstat_por_parse_double).
 * Returns null on parse failure.
 */
export declare function porParseDouble(s: string): PorDoubleResult | null;