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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| // | ||
| // BvidConvertor.swift | ||
| // BilibiliLive | ||
| // | ||
| // Created by yicheng on 2024/12/13. | ||
| // | ||
|
|
||
| enum BvidConvertor { | ||
| // https://github.com/SocialSisterYi/bilibili-API-collect/blob/master/docs/misc/bvid_desc.md | ||
| private static let XOR_CODE: UInt64 = 23442827791579 | ||
| private static let MASK_CODE: UInt64 = 2251799813685247 | ||
| private static let MAX_AID: UInt64 = 1 << 51 | ||
|
|
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| private static let data: [UInt8] = [70, 99, 119, 65, 80, 78, 75, 84, 77, 117, 103, 51, 71, 86, 53, 76, 106, 55, 69, 74, 110, 72, 112, 87, 115, 120, 52, 116, 98, 56, 104, 97, 89, 101, 118, 105, 113, 66, 122, 54, 114, 107, 67, 121, 49, 50, 109, 85, 83, 68, 81, 88, 57, 82, 100, 111, 90, 102] | ||
|
|
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| private static let BASE: UInt64 = 58 | ||
| private static let BV_LEN: Int = 12 | ||
| private static let PREFIX: String = "BV1" | ||
|
|
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| static func av2bv(avid: UInt64) -> String { | ||
| var bytes: [UInt8] = [66, 86, 49, 48, 48, 48, 48, 48, 48, 48, 48, 48] | ||
| var bvIdx = BV_LEN - 1 | ||
| var tmp = (MAX_AID | avid) ^ XOR_CODE | ||
|
|
||
| while tmp != 0 { | ||
| bytes[bvIdx] = data[Int(tmp % BASE)] | ||
| tmp /= BASE | ||
| bvIdx -= 1 | ||
| } | ||
|
|
||
| bytes.swapAt(3, 9) | ||
| bytes.swapAt(4, 7) | ||
|
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| return String(decoding: bytes, as: UTF8.self) | ||
| } | ||
|
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| static func bv2av(bvid: String) -> UInt64 { | ||
| let fixedBvid: String | ||
| if bvid.hasPrefix("BV") { | ||
| fixedBvid = bvid | ||
| } else { | ||
| fixedBvid = "BV" + bvid | ||
| } | ||
| var bvidArray = Array(fixedBvid.utf8) | ||
|
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| bvidArray.swapAt(3, 9) | ||
| bvidArray.swapAt(4, 7) | ||
|
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| let trimmedBvid = String(decoding: bvidArray[3...], as: UTF8.self) | ||
|
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| var tmp: UInt64 = 0 | ||
|
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| for char in trimmedBvid { | ||
| if let idx = data.firstIndex(of: char.utf8.first!) { | ||
| tmp = tmp * BASE + UInt64(idx) | ||
| } | ||
| } | ||
|
|
||
| return (tmp & MASK_CODE) ^ XOR_CODE | ||
| } | ||
| } |
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