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Merge pull request #963 from GalaxySnail/update-bv-python

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修复BV号av号转换算法的 python 实现中的类型错误，提高可读性
This commit is contained in:
z0z0r4
2024-02-08 23:28:24 +08:00
committed by GitHub
parent 33bde6f6af 7b22c145d2
commit 97419ba65f
1 changed files with 16 additions and 17 deletions
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33
docs/misc/bvid_desc.md
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@@ -26,9 +26,9 @@
## 算法概述 ## 算法概述
~~算法以及程序主要参考[知乎@mcfx的回答](https://www.zhihu.com/question/381784377/answer/1099438784)~~ ~~算法以及程序主要参考[知乎@mcfx的回答](https://www.zhihu.com/question/381784377/answer/1099438784)~~
~~实际上该算法并不完整,新的算法参考自[【揭秘】av号转bv号的过程](https://www.bilibili.com/video/BV1N741127Tj)~~ ~~实际上该算法并不完整,新的算法参考自[【揭秘】av号转bv号的过程](https://www.bilibili.com/video/BV1N741127Tj)~~
实际上上面的算法依然不完整，新的算法参考自 [SocialSisterYi#740](https://github.com/SocialSisterYi/bilibili-API-collect/issues/740)~~来自 B 站某个 JS 文件？~~ 实际上上面的算法依然不完整，新的算法参考自 [SocialSisterYi#740](https://github.com/SocialSisterYi/bilibili-API-collect/issues/740)~~来自 B 站某个 JS 文件？~~
### av->bv算法 ### av->bv算法
@@ -69,7 +69,7 @@
<CodeGroup> <CodeGroup>
<CodeGroupItem title="JavaScript"> <CodeGroupItem title="JavaScript">
```javascript ```javascript
const XOR_CODE = 23442827791579n; const XOR_CODE = 23442827791579n;
const MASK_CODE = 2251799813685247n; const MASK_CODE = 2251799813685247n;
@@ -162,20 +162,19 @@ BASE = len(ALPHABET)
PREFIX = "BV1" PREFIX = "BV1"
PREFIX_LEN = len(PREFIX) PREFIX_LEN = len(PREFIX)
CODE_LEN = len(ENCODE_MAP) CODE_LEN = len(ENCODE_MAP)
BV_LEN = PREFIX_LEN + CODE_LEN
def av2bv(aid: int) -> str: def av2bv(aid: int) -> str:
bvid = [""] * 9 bvid = [""] * 9
tmp = (MAX_AID | aid) ^ XOR_CODE tmp = (MAX_AID | aid) ^ XOR_CODE
for i in range(CODE_LEN): for i in range(CODE_LEN):
bvid[ENCODE_MAP[i]] = ALPHABET[int(tmp % BASE)] bvid[ENCODE_MAP[i]] = ALPHABET[tmp % BASE]
tmp /= BASE tmp //= BASE
return PREFIX + "".join(bvid) return PREFIX + "".join(bvid)
def bv2av(bvid: str) -> int: def bv2av(bvid: str) -> int:
assert bvid[:3] == PREFIX assert bvid[:3] == PREFIX
bvid = list(bvid[3:]) bvid = bvid[3:]
tmp = 0 tmp = 0
for i in range(CODE_LEN): for i in range(CODE_LEN):
idx = ALPHABET.index(bvid[DECODE_MAP[i]]) idx = ALPHABET.index(bvid[DECODE_MAP[i]])
@@ -207,16 +206,16 @@ func av2bv(avid: UInt64) -> String {
var bytes: [UInt8] = [66, 86, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48] var bytes: [UInt8] = [66, 86, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48]
var bvIdx = BV_LEN - 1 var bvIdx = BV_LEN - 1
var tmp = (MAX_AID | avid) ^ XOR_CODE var tmp = (MAX_AID | avid) ^ XOR_CODE
while tmp != 0 { while tmp != 0 {
bytes[bvIdx] = data[Int(tmp % BASE)] bytes[bvIdx] = data[Int(tmp % BASE)]
tmp /= BASE tmp /= BASE
bvIdx -= 1 bvIdx -= 1
} }
bytes.swapAt(3, 9) bytes.swapAt(3, 9)
bytes.swapAt(4, 7) bytes.swapAt(4, 7)
return String(decoding: bytes, as: UTF8.self) return String(decoding: bytes, as: UTF8.self)
} }
@@ -228,20 +227,20 @@ func bv2av(bvid: String) -> UInt64 {
fixedBvid = "BV" + bvid fixedBvid = "BV" + bvid
} }
var bvidArray = Array(fixedBvid.utf8) var bvidArray = Array(fixedBvid.utf8)
bvidArray.swapAt(3, 9) bvidArray.swapAt(3, 9)
bvidArray.swapAt(4, 7) bvidArray.swapAt(4, 7)
let trimmedBvid = String(decoding: bvidArray[3...], as: UTF8.self) let trimmedBvid = String(decoding: bvidArray[3...], as: UTF8.self)
var tmp: UInt64 = 0 var tmp: UInt64 = 0
for char in trimmedBvid { for char in trimmedBvid {
if let idx = data.firstIndex(of: char.utf8.first!) { if let idx = data.firstIndex(of: char.utf8.first!) {
tmp = tmp * BASE + UInt64(idx) tmp = tmp * BASE + UInt64(idx)
} }
} }
return (tmp & MASK_CODE) ^ XOR_CODE return (tmp & MASK_CODE) ^ XOR_CODE
} }