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Update av2bv Python Demo

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SocialSisterYi 2024-02-04 18:17:59 +08:00
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docs/misc/bvid_desc.md
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@ -148,44 +148,42 @@ console.log(bv2av('BV1L9Uoa9EUx'));
### Python
来自：[SocialSisterYi#847 (comment)](https://github.com/SocialSisterYi/bilibili-API-collect/issues/847#issuecomment-1807020675)
来自：[#847](https://github.com/SocialSisterYi/bilibili-API-collect/issues/847#issuecomment-1807020675)
```python
XOR_CODE = 23442827791579
MASK_CODE = 2251799813685247
MAX_AID = 1 << 51
ALPHABET = "FcwAPNKTMug3GV5Lj7EJnHpWsx4tb8haYeviqBz6rkCy12mUSDQX9RdoZf"
ENCODE_MAP = 8, 7, 0, 5, 1, 3, 2, 4, 6
DECODE_MAP = tuple(reversed(ENCODE_MAP))
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
BASE = len(ALPHABET)
PREFIX = "BV1"
PREFIX_LEN = len(PREFIX)
CODE_LEN = len(ENCODE_MAP)
BV_LEN = PREFIX_LEN + CODE_LEN
def av2bv(aid: int) -> str:
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
bvid = [""] * 9
tmp = (MAX_AID | aid) ^ XOR_CODE
while int(tmp) != 0:
bytes[bv_idx] = data[int(tmp % BASE)]
for i in range(CODE_LEN):
bvid[ENCODE_MAP[i]] = ALPHABET[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])
return PREFIX + "".join(bvid)
def bv2av(bvid: str) -> int:
bvid = list(bvid)
bvid[3], bvid[9] = bvid[9], bvid[3]
bvid[4], bvid[7] = bvid[7], bvid[4]
bvid = bvid[3:]
assert bvid[:3] == PREFIX
bvid = list(bvid[3:])
tmp = 0
for i in bvid:
idx = data.index(i.encode())
for i in range(CODE_LEN):
idx = ALPHABET.index(bvid[DECODE_MAP[i]])
tmp = tmp * BASE + idx
return (tmp & MASK_CODE) ^ XOR_CODE
print(av2bv(111298867365120))
print(bv2av("BV1L9Uoa9EUx"))
assert av2bv(111298867365120) == "BV1L9Uoa9EUx"
assert bv2av("BV1L9Uoa9EUx") == 111298867365120
```
### Rust
@ -253,6 +251,11 @@ print(bv2av(bvid: "BV1L9Uoa9EUx"))
## 老版算法存档
**以下算法已失效**，编解码函数值域有限，不推荐使用，在此仅作为存档
<details>
<summary>查看折叠内容：</summary>
算法参考自[【揭秘】av号转bv号的过程](https://www.bilibili.com/video/BV1N741127Tj)
### av->bv算法
@ -651,3 +654,5 @@ fn bv2av(bvid: [u8; 10]) -> u64 {
// assert_eq!(*b"17x411w7KC", av2bv(170001));
// assert_eq!(170001, bv2av(*b"17x411w7KC"));
```
</details>