/**
 * Inline binary fixtures shared by the streams-metadata test suite. Each
 * helper produces the minimum bytes required to exercise a specific code
 * path without pulling in real image files.
 */

export function buildMinimalJpeg(): Uint8Array {
    const soi = new Uint8Array([0xff, 0xd8]);
    const sos = new Uint8Array([
        0xff, 0xda, 0x00, 0x08, 0x01, 0x01, 0x00, 0x00, 0x3f, 0x00,
    ]);
    const eoi = new Uint8Array([0xff, 0xd9]);
    return new Uint8Array([...soi, ...sos, ...eoi]);
}

export function buildMinimalPng(): Uint8Array {
    const sig = new Uint8Array([
        0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a,
    ]);
    const ihdr = new Uint8Array(25);
    const dv = new DataView(ihdr.buffer);
    dv.setUint32(0, 13, false);
    ihdr[4] = 0x49;
    ihdr[5] = 0x48;
    ihdr[6] = 0x44;
    ihdr[7] = 0x52;
    dv.setUint32(8, 100, false);
    dv.setUint32(12, 80, false);
    ihdr[16] = 8;
    ihdr[17] = 2;
    return new Uint8Array([...sig, ...ihdr]);
}

/** Pseudo-random bytes that match no known signature. */
export function buildGibberish(): Uint8Array {
    return new Uint8Array([0x00, 0x01, 0x02, 0x03, 0x04, 0x05]);
}