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161 lines
3.2 KiB
Markdown
161 lines
3.2 KiB
Markdown
# bvID说明
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2020-03-23 B站推出了全新的稿件视频ID“bvID”来接替之前的“avID”，其用法与性质等价于“avID”
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详见：
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1. [【升级公告】AV号全面升级至BV号（专栏）](https://www.bilibili.com/read/cv5167957)
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2. [【升级公告】AV号全面升级至BV号](https://www.bilibili.com/blackboard/activity-BV-PC.html)
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## 格式：
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“bvID”恒为长度为12的字符串，前两个字母为大写“BV”，后10个位base58计算结果
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## 实质：
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“bvID"为“avID”的base58编码，可通过算法进行相互转化
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## avID发放方式的变化：
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从2009-09-09 09:09:09 [av2](https://www.bilibili.com/video/av2)的发布到2020-03-28 19:45:02 [av99999999](https://www.bilibili.com/video/av99999999)的发布B站结束了以投稿时间为顺序的avID发放，改为随机发放avID
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~~暗示B站东方要完？泪目~~
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## av->bv算法：
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1. a=(avID⊕177451812)+100618342136696320
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2. 以i为循环变量循环10次b[i]=(a/58^i)%58
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3. 将b[i]中各个数字转换为以下码表中的字符
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码表：
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> fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF
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4. 按照以下字符顺序编码表编码b[i]
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字符编码表：
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> 0->11
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>
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> 1->10
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>
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> 2->3
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>
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> 3->8
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>
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> 4->4
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>
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> 5->6
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>
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> 6->2
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>
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> 7->9
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>
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> 8->5
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>
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> 9->7
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5. 最后在b[i]前面添加字符`BV`
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[援引知乎@mcfx的回答](https://www.zhihu.com/question/381784377/answer/1099438784)
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## bv->av算法：
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为以上算法的逆运算
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## 转换程序：
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目前使用python与c作为示例
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### python
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```python
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table = 'fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF' //码表
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tr = {} //反查码表
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for i in range(58):
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tr[table[i]] = i
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s = [11, 10, 3, 8, 4, 6, 2, 9, 5, 7] //位置编码表
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xor = 177451812 //固定异或值
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add = 100618342136696320 //固定加法值
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def bv2av(x):
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r = 0
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for i in range(10):
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r += tr[x[s[i]]] * 58 ** i
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return (r - add) ^ xor
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def av2bv(x):
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x = (x ^ xor) + add
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r = list('BV ')
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for i in range(10):
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r[s[i]] = table[x // 58 ** i % 58]
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return ''. join(r)
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print(av2bv(170001))
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print(bv2av('BV17x411w7KC'))
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```
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输出为：
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```
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BV17x411w7KC
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170001
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```
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### C语言
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```c
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#include <stdio.h>
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#include <math.h>
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#include <string.h>
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const char table[] = "fZodR9XQDSUm21yCkr6zBqiveYah8bt4xsWpHnJE7jL5VG3guMTKNPAwcF"; //码表
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char tr[124]; //反查码表
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const unsigned long long Xor = 177451812; //固定异或值
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const unsigned long long add = 100618342136696320; //固定加法值
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const int s[] = {11, 10, 3, 8, 4, 6, 2, 9, 5, 7}; //位置编码表
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char result[13]; //编码结果
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void tr_init()
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{
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for (int i = 0; i < 58; i++)
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tr[table[i]] = i;
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}
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unsigned long long bv2av(char bv[])
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{
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unsigned long long r = 0;
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unsigned long long av;
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for (int i = 0; i < 10; i++)
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r += tr[bv[s[i]]] * (unsigned long long)pow(58, i);
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av = (r - add) ^ Xor;
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return av;
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}
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char* av2bv(unsigned long long av)
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{
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strcpy(result,"BV ");
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av = (av ^ Xor) + add;
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for (int i = 0; i < 10; i++)
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result[s[i]] = table[(unsigned long long)(av / (unsigned long long)pow(58, i)) % 58];
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result[10] = ' \0';//添加休止符
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char *bv=result;
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return bv;
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}
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int main()
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{
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tr_init();
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printf("%s\n",av2bv(170001));
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printf("%u\n",bv2av("BV17x411w7KC"));
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return 0;
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}
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```
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输出为：
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```
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BV17x411w7KC
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170001
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```
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