@taichunmin/crc/lib/crc32mef.ts

A cross platform alternative for calculating Cyclic Redundancy Checks (CRC) values.

import { setObject, u32 } from './common2'

const POLY_TABLE = new Uint32Array([
  0x00000000, 0x9695C4CA, 0xFB4839C9, 0x6DDDFD03, 0x20F3C3CF, 0xB6660705, 0xDBBBFA06, 0x4D2E3ECC,
  0x41E7879E, 0xD7724354, 0xBAAFBE57, 0x2C3A7A9D, 0x61144451, 0xF781809B, 0x9A5C7D98, 0x0CC9B952,
  0x83CF0F3C, 0x155ACBF6, 0x788736F5, 0xEE12F23F, 0xA33CCCF3, 0x35A90839, 0x5874F53A, 0xCEE131F0,
  0xC22888A2, 0x54BD4C68, 0x3960B16B, 0xAFF575A1, 0xE2DB4B6D, 0x744E8FA7, 0x199372A4, 0x8F06B66E,
  0xD1FDAE25, 0x47686AEF, 0x2AB597EC, 0xBC205326, 0xF10E6DEA, 0x679BA920, 0x0A465423, 0x9CD390E9,
  0x901A29BB, 0x068FED71, 0x6B521072, 0xFDC7D4B8, 0xB0E9EA74, 0x267C2EBE, 0x4BA1D3BD, 0xDD341777,
  0x5232A119, 0xC4A765D3, 0xA97A98D0, 0x3FEF5C1A, 0x72C162D6, 0xE454A61C, 0x89895B1F, 0x1F1C9FD5,
  0x13D52687, 0x8540E24D, 0xE89D1F4E, 0x7E08DB84, 0x3326E548, 0xA5B32182, 0xC86EDC81, 0x5EFB184B,
  0x7598EC17, 0xE30D28DD, 0x8ED0D5DE, 0x18451114, 0x556B2FD8, 0xC3FEEB12, 0xAE231611, 0x38B6D2DB,
  0x347F6B89, 0xA2EAAF43, 0xCF375240, 0x59A2968A, 0x148CA846, 0x82196C8C, 0xEFC4918F, 0x79515545,
  0xF657E32B, 0x60C227E1, 0x0D1FDAE2, 0x9B8A1E28, 0xD6A420E4, 0x4031E42E, 0x2DEC192D, 0xBB79DDE7,
  0xB7B064B5, 0x2125A07F, 0x4CF85D7C, 0xDA6D99B6, 0x9743A77A, 0x01D663B0, 0x6C0B9EB3, 0xFA9E5A79,
  0xA4654232, 0x32F086F8, 0x5F2D7BFB, 0xC9B8BF31, 0x849681FD, 0x12034537, 0x7FDEB834, 0xE94B7CFE,
  0xE582C5AC, 0x73170166, 0x1ECAFC65, 0x885F38AF, 0xC5710663, 0x53E4C2A9, 0x3E393FAA, 0xA8ACFB60,
  0x27AA4D0E, 0xB13F89C4, 0xDCE274C7, 0x4A77B00D, 0x07598EC1, 0x91CC4A0B, 0xFC11B708, 0x6A8473C2,
  0x664DCA90, 0xF0D80E5A, 0x9D05F359, 0x0B903793, 0x46BE095F, 0xD02BCD95, 0xBDF63096, 0x2B63F45C,
  0xEB31D82E, 0x7DA41CE4, 0x1079E1E7, 0x86EC252D, 0xCBC21BE1, 0x5D57DF2B, 0x308A2228, 0xA61FE6E2,
  0xAAD65FB0, 0x3C439B7A, 0x519E6679, 0xC70BA2B3, 0x8A259C7F, 0x1CB058B5, 0x716DA5B6, 0xE7F8617C,
  0x68FED712, 0xFE6B13D8, 0x93B6EEDB, 0x05232A11, 0x480D14DD, 0xDE98D017, 0xB3452D14, 0x25D0E9DE,
  0x2919508C, 0xBF8C9446, 0xD2516945, 0x44C4AD8F, 0x09EA9343, 0x9F7F5789, 0xF2A2AA8A, 0x64376E40,
  0x3ACC760B, 0xAC59B2C1, 0xC1844FC2, 0x57118B08, 0x1A3FB5C4, 0x8CAA710E, 0xE1778C0D, 0x77E248C7,
  0x7B2BF195, 0xEDBE355F, 0x8063C85C, 0x16F60C96, 0x5BD8325A, 0xCD4DF690, 0xA0900B93, 0x3605CF59,
  0xB9037937, 0x2F96BDFD, 0x424B40FE, 0xD4DE8434, 0x99F0BAF8, 0x0F657E32, 0x62B88331, 0xF42D47FB,
  0xF8E4FEA9, 0x6E713A63, 0x03ACC760, 0x953903AA, 0xD8173D66, 0x4E82F9AC, 0x235F04AF, 0xB5CAC065,
  0x9EA93439, 0x083CF0F3, 0x65E10DF0, 0xF374C93A, 0xBE5AF7F6, 0x28CF333C, 0x4512CE3F, 0xD3870AF5,
  0xDF4EB3A7, 0x49DB776D, 0x24068A6E, 0xB2934EA4, 0xFFBD7068, 0x6928B4A2, 0x04F549A1, 0x92608D6B,
  0x1D663B05, 0x8BF3FFCF, 0xE62E02CC, 0x70BBC606, 0x3D95F8CA, 0xAB003C00, 0xC6DDC103, 0x504805C9,
  0x5C81BC9B, 0xCA147851, 0xA7C98552, 0x315C4198, 0x7C727F54, 0xEAE7BB9E, 0x873A469D, 0x11AF8257,
  0x4F549A1C, 0xD9C15ED6, 0xB41CA3D5, 0x2289671F, 0x6FA759D3, 0xF9329D19, 0x94EF601A, 0x027AA4D0,
  0x0EB31D82, 0x9826D948, 0xF5FB244B, 0x636EE081, 0x2E40DE4D, 0xB8D51A87, 0xD508E784, 0x439D234E,
  0xCC9B9520, 0x5A0E51EA, 0x37D3ACE9, 0xA1466823, 0xEC6856EF, 0x7AFD9225, 0x17206F26, 0x81B5ABEC,
  0x8D7C12BE, 0x1BE9D674, 0x76342B77, 0xE0A1EFBD, 0xAD8FD171, 0x3B1A15BB, 0x56C7E8B8, 0xC0522C72,
])

/**
 * - poly: 0x741B8CD7
 * - initial: 0xFFFFFFFF
 * - xorout: 0x00000000
 * - refin: true
 * - refout: true
 */
export default function crc32mef (buf: Uint8Array = new Uint8Array(), prev: number = 0xFFFFFFFF): number {
  u32[0] = prev
  for (const b of buf) u32[0] = POLY_TABLE[(u32[0] ^ b) & 0xFF] ^ (u32[0] >>> 8)
  return u32[0]
}

setObject(globalThis, ['taichunmin', 'crc', 'crc32mef'], crc32mef)