/** How a named CMap breaks a string into codes, and what those codes mean. */
export interface PredefinedCMap {
    /** The `TextDecoder` label the code bytes are in. */
    readonly charset: string;
    /** Whether a byte begins a TWO-byte code; anything else stands alone. */
    readonly leadsPair: (byte: number) => boolean;
    /** §9.7.5.2 — a `…-V` CMap sets its text down the page. */
    readonly vertical: boolean;
}
/**
 * What a predefined CMap name comes to.
 *
 * @param name The `/Encoding` name, as the font states it.
 * @returns Its encoding and code structure, or `undefined` for `Identity` and
 *          for any name whose encoding this cannot decode.
 */
export declare function predefinedCMap(name: string): PredefinedCMap | undefined;
/** Split a shown string the way this CMap's codespace says (§9.7.6.2). */
export declare function splitPredefined(cmap: PredefinedCMap, bytes: Uint8Array): Array<number>;
/** The character one code stands for: its own bytes, read in the CMap's encoding. */
export declare function decodePredefined(cmap: PredefinedCMap, code: number): string;