/**
 * Minimal ISOBMFF (ISO Base Media File Format) reader for the boxes AVIF/HEIC
 * use to store metadata. This is shared parsing machinery; the AVIF-specific
 * XMP logic lives in `avif.ts`.
 *
 * A box is: size(4, big-endian) + type(4 ASCII) + payload. size===1 means a
 * 64-bit largesize follows the type; size===0 means "to end of file". A FullBox
 * additionally begins its payload with version(1) + flags(3).
 */
export interface Box {
    type: string;
    /** Offset of the box's size field. */
    start: number;
    /** 8, or 16 when a 64-bit largesize is used. */
    headerSize: number;
    /** Total box length including header. */
    size: number;
}
export declare function fourccAt(b: Uint8Array, o: number): string;
export declare function dv(b: Uint8Array): DataView;
/** Read a big-endian unsigned integer of `n` bytes (n ≤ 8, value < 2^53). */
export declare function readUintBE(b: Uint8Array, o: number, n: number): number;
/** Parse the sequence of boxes in [start, end). */
export declare function parseBoxes(b: Uint8Array, start: number, end: number): Box[];
/** First child box of a container box (skips the FullBox version+flags if told to). */
export declare function childBoxes(b: Uint8Array, box: Box, fullBox?: boolean): Box[];
export declare function find(boxes: Box[], type: string): Box | undefined;
/** Read a NUL-terminated string starting at `o`; returns text and the index after the NUL. */
export declare function readCString(b: Uint8Array, o: number, end: number): {
    str: string;
    next: number;
};