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Modified
docs/misc/bvid_desc.md
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XFEstudio/bilibili-API-collect
feat: bv<-->av 增加java实现 (#1021)
11d4285
代码差异
1 个文件
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@@ -248,6 +248,87 @@ print(av2bv(avid: 111298867365120))
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print(bv2av(bvid: "BV1L9Uoa9EUx"))
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```
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### Java
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```
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import java.math.BigInteger;
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/**
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* @author cctyl
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*/
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public class AVBVConverter {
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private static final BigInteger XOR_CODE = BigInteger.valueOf(23442827791579L);
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private static final BigInteger MASK_CODE = BigInteger.valueOf(2251799813685247L);
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private static final BigInteger MAX_AID = BigInteger.ONE.shiftLeft(51);
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private static final int BASE = 58;
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private static final String DATA = "FcwAPNKTMug3GV5Lj7EJnHpWsx4tb8haYeviqBz6rkCy12mUSDQX9RdoZf";
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public static String av2bv(int aidParam) {
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BigInteger aid = BigInteger.valueOf(aidParam);
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char[] bytes = {'B', 'V', '1', '0', '0', '0', '0', '0', '0', '0', '0', '0'};
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int bvIndex = bytes.length - 1;
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BigInteger tmp = MAX_AID.or(aid).xor(XOR_CODE);
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while (tmp.compareTo(BigInteger.ZERO) > 0) {
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bytes[bvIndex] = DATA.charAt(tmp.mod(BigInteger.valueOf(BASE)).intValue());
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tmp = tmp.divide(BigInteger.valueOf(BASE));
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bvIndex -= 1;
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}
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swap(bytes, 3, 9);
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swap(bytes, 4, 7);
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StringBuilder sb = new StringBuilder(bytes.length);
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for (Character ch : bytes) {
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sb.append(ch);
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}
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return sb.toString();
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}
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public static int bv2av(String bvid) {
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char[] bvidArr = bvid.toCharArray();
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swap(bvidArr, 3, 9);
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swap(bvidArr, 4, 7);
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String adjustedBvid = new String(bvidArr, 3, bvidArr.length - 3);
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BigInteger tmp = BigInteger.ZERO;
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for (char c : adjustedBvid.toCharArray()) {
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tmp = tmp.multiply(BigInteger.valueOf(BASE)).add(BigInteger.valueOf(DATA.indexOf(c)));
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}
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BigInteger xor = tmp.and(MASK_CODE).xor(XOR_CODE);
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return xor.intValue();
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}
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private static void swap(char[] array, int i, int j) {
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char temp = array[i];
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array[i] = array[j];
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array[j] = temp;
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}
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public static void main(String[] args) {
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final int aid1 = 643755790;
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final String bv1 = "BV1bY4y1j7RA";
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final int aid2 = 305988942;
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final String bv2 = "BV1aP411K7it";
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//av ==> bv
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assert av2bv(aid1).equals(bv1);
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assert av2bv(aid2).equals(bv2);
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//bv ==>av
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assert bv2av(bv1) == aid1;
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assert bv2av(bv2) == aid2;
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}
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}
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```
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## 老版算法存档
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**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