已经有av111298867365120，怎么算bv

[Jadlokin-Scarlet]

如题
https://www.bilibili.com/video/av111298867365120/

[0f-0b]

可以参考 https://github.com/Colerar/abv/blob/main/src/lib.rs 的实现。用它算出的 BV 号是 BV1L9Uoa9EUx。

[12345-mcpython]

仿写的新转换算法

XOR_CODE = 23442827791579
MASK_CODE = 2251799813685247
MAX_AID = 1 << 51;

data = [b'F', b'c', b'w', b'A', b'P', b'N', b'K', b'T', b'M', b'u', b'g', b'3', b'G', b'V', b'5', b'L', b'j', b'7', b'E', b'J', b'n', b'H', b'p', b'W', b's', b'x', b'4', b't', b'b', b'8', b'h', b'a', b'Y', b'e', b'v', b'i', b'q', b'B', b'z', b'6', b'r', b'k', b'C', b'y', b'1', b'2', b'm', b'U', b'S', b'D', b'Q', b'X', b'9', b'R', b'd', b'o', b'Z', b'f']

BASE = 58
BV_LEN = 12
PREFIX = "BV1"

def av2bv(aid):
    bytes = [b'B', b'V', b'1', b'0', b'0', b'0', b'0', b'0', b'0', b'0', b'0', b'0']
    bv_idx = BV_LEN - 1
    tmp = (MAX_AID | aid) ^ XOR_CODE
    while int(tmp) != 0:
        bytes[bv_idx] = data[int(tmp % BASE)]
        tmp /= BASE
        bv_idx -= 1
    bytes[3], bytes[9] = bytes[9], bytes[3]
    bytes[4], bytes[7] = bytes[7], bytes[4]
    return "".join([i.decode() for i in bytes])

def bv2av(bvid: str):
    bvid = list(bvid)
    bvid[3], bvid[9] = bvid[9], bvid[3]
    bvid[4], bvid[7] = bvid[7], bvid[4]
    bvid = bvid[3:]
    tmp = 0
    for i in bvid:
        idx = data.index(i.encode())
        tmp = tmp * BASE + idx
    return (tmp & MASK_CODE) ^ XOR_CODE

print(av2bv(111298867365120))
print(bv2av("BV1L9Uoa9EUx"))

[catlair]

将 @12345-mcpython 的 python 转为 JavaScript

const XOR_CODE = 23442827791579n;
const MASK_CODE = 2251799813685247n;
const MAX_AID = 1n << 51n;
const BASE = 58n;

const data = ['F', 'c', 'w', 'A', 'P', 'N', 'K', 'T', 'M', 'u', 'g', '3', 'G', 'V', '5', 'L', 'j', '7', 'E', 'J', 'n', 'H', 'p', 'W', 's', 'x', '4', 't', 'b', '8', 'h', 'a', 'Y', 'e', 'v', 'i', 'q', 'B', 'z', '6', 'r', 'k', 'C', 'y', '1', '2', 'm', 'U', 'S', 'D', 'Q', 'X', '9', 'R', 'd', 'o', 'Z', 'f'];

function av2bv(aid) {
  const bytes = ['B', 'V', '1', '0', '0', '0', '0', '0', '0', '0', '0', '0'];
  let bv_idx = bytes.length - 1;
  let tmp = (MAX_AID | BigInt(aid)) ^ XOR_CODE;
  while (tmp > 0) {
    bytes[bv_idx] = data[Number(tmp % BigInt(BASE))];
    tmp = tmp / BASE;
    bv_idx -= 1;
  }
  [bytes[3], bytes[9]] = [bytes[9], bytes[3]];
  [bytes[4], bytes[7]] = [bytes[7], bytes[4]];
  return bytes.join('');
}

function bv2av(bvid) {
  const bvidArr = Array.from(bvid);
  [bvidArr[3], bvidArr[9]] = [bvidArr[9], bvidArr[3]];
  [bvidArr[4], bvidArr[7]] = [bvidArr[7], bvidArr[4]];
  bvidArr.splice(0, 3);
  let tmp = 0n;
  for (let i = 0; i < bvidArr.length; i++) {
    const idx = data.indexOf(bvidArr[i]);
    tmp = tmp * BASE + BigInt(idx);
  }
  return Number((tmp & MASK_CODE) ^ XOR_CODE);
}

console.log(av2bv(111298867365120));
console.log(bv2av('BV1L9Uoa9EUx'));

[GalaxySnail]

与 issue #740 相关

[xiaoyv404]

close by #857