import { setObject, u16 } from './common2'

const POLY_TABLE = new Uint16Array([
  0x0000, 0x3D65, 0x7ACA, 0x47AF, 0xF594, 0xC8F1, 0x8F5E, 0xB23B,
  0xD64D, 0xEB28, 0xAC87, 0x91E2, 0x23D9, 0x1EBC, 0x5913, 0x6476,
  0x91FF, 0xAC9A, 0xEB35, 0xD650, 0x646B, 0x590E, 0x1EA1, 0x23C4,
  0x47B2, 0x7AD7, 0x3D78, 0x001D, 0xB226, 0x8F43, 0xC8EC, 0xF589,
  0x1E9B, 0x23FE, 0x6451, 0x5934, 0xEB0F, 0xD66A, 0x91C5, 0xACA0,
  0xC8D6, 0xF5B3, 0xB21C, 0x8F79, 0x3D42, 0x0027, 0x4788, 0x7AED,
  0x8F64, 0xB201, 0xF5AE, 0xC8CB, 0x7AF0, 0x4795, 0x003A, 0x3D5F,
  0x5929, 0x644C, 0x23E3, 0x1E86, 0xACBD, 0x91D8, 0xD677, 0xEB12,
  0x3D36, 0x0053, 0x47FC, 0x7A99, 0xC8A2, 0xF5C7, 0xB268, 0x8F0D,
  0xEB7B, 0xD61E, 0x91B1, 0xACD4, 0x1EEF, 0x238A, 0x6425, 0x5940,
  0xACC9, 0x91AC, 0xD603, 0xEB66, 0x595D, 0x6438, 0x2397, 0x1EF2,
  0x7A84, 0x47E1, 0x004E, 0x3D2B, 0x8F10, 0xB275, 0xF5DA, 0xC8BF,
  0x23AD, 0x1EC8, 0x5967, 0x6402, 0xD639, 0xEB5C, 0xACF3, 0x9196,
  0xF5E0, 0xC885, 0x8F2A, 0xB24F, 0x0074, 0x3D11, 0x7ABE, 0x47DB,
  0xB252, 0x8F37, 0xC898, 0xF5FD, 0x47C6, 0x7AA3, 0x3D0C, 0x0069,
  0x641F, 0x597A, 0x1ED5, 0x23B0, 0x918B, 0xACEE, 0xEB41, 0xD624,
  0x7A6C, 0x4709, 0x00A6, 0x3DC3, 0x8FF8, 0xB29D, 0xF532, 0xC857,
  0xAC21, 0x9144, 0xD6EB, 0xEB8E, 0x59B5, 0x64D0, 0x237F, 0x1E1A,
  0xEB93, 0xD6F6, 0x9159, 0xAC3C, 0x1E07, 0x2362, 0x64CD, 0x59A8,
  0x3DDE, 0x00BB, 0x4714, 0x7A71, 0xC84A, 0xF52F, 0xB280, 0x8FE5,
  0x64F7, 0x5992, 0x1E3D, 0x2358, 0x9163, 0xAC06, 0xEBA9, 0xD6CC,
  0xB2BA, 0x8FDF, 0xC870, 0xF515, 0x472E, 0x7A4B, 0x3DE4, 0x0081,
  0xF508, 0xC86D, 0x8FC2, 0xB2A7, 0x009C, 0x3DF9, 0x7A56, 0x4733,
  0x2345, 0x1E20, 0x598F, 0x64EA, 0xD6D1, 0xEBB4, 0xAC1B, 0x917E,
  0x475A, 0x7A3F, 0x3D90, 0x00F5, 0xB2CE, 0x8FAB, 0xC804, 0xF561,
  0x9117, 0xAC72, 0xEBDD, 0xD6B8, 0x6483, 0x59E6, 0x1E49, 0x232C,
  0xD6A5, 0xEBC0, 0xAC6F, 0x910A, 0x2331, 0x1E54, 0x59FB, 0x649E,
  0x00E8, 0x3D8D, 0x7A22, 0x4747, 0xF57C, 0xC819, 0x8FB6, 0xB2D3,
  0x59C1, 0x64A4, 0x230B, 0x1E6E, 0xAC55, 0x9130, 0xD69F, 0xEBFA,
  0x8F8C, 0xB2E9, 0xF546, 0xC823, 0x7A18, 0x477D, 0x00D2, 0x3DB7,
  0xC83E, 0xF55B, 0xB2F4, 0x8F91, 0x3DAA, 0x00CF, 0x4760, 0x7A05,
  0x1E73, 0x2316, 0x64B9, 0x59DC, 0xEBE7, 0xD682, 0x912D, 0xAC48,
])

/**
 * - poly: 0x3D65
 * - initial: 0x0000
 * - xorout: 0xFFFF
 * - refin: false
 * - refout: false
 */
export default function crc16en13757 (buf: Uint8Array = new Uint8Array(), prev: number = 0xFFFF): number {
  u16[0] = prev ^ 0xFFFF // revert of refout and xorout
  for (const b of buf) u16[0] = POLY_TABLE[(u16[0] >>> 8) ^ b] ^ (u16[0] << 8)
  return u16[0] ^ 0xFFFF
}

setObject(globalThis, ['taichunmin', 'crc', 'crc16en13757'], crc16en13757)