liangjianyi/sundryutilty

日常开发中为解决某些琐碎问题编写的库

sundryutilty's Issues

代码生成的建议

每个 BigIntegerToXxx 方法的逻辑都有高度的模式重合，建议 pass-compile IL rewrite 进行 CodeGen。

转换为有符号整数的函数模版：
public static T BigIntegerToXxx(this BigInteger bi) { byte[] bytes = bi.ToByteArray(); if (bytes.Length == **sizeof(T)**) { return BitConverter.To**Xxx**(bytes); } else if (bytes.Length == **sizeof(T)** + 1) { byte[] res = new byte[**sizeof(T)**]; Array.Copy(bytes, res, bytes.Length - 1); return BitConverter.To**Xxx**(res); } else if (bytes.Length < **sizeof(T)**) { byte[] res = new byte[**sizeof(T)**]; Array.Copy(bytes, res, bytes.Length); if (bi.Sign == -1) { for (int i = 0; i < res.Length; i++) { if (res[i] == 0 && i >= bytes.Length) { res[i] = 255; } } } return BitConverter.To**Xxx**(res); } else { throw new ArgumentOutOfRangeException($"bi={bi}", "The bytes length of BigInteger larger than **T**."); } }

转换为无符号整数的函数模版：
public static UT BigIntegerToUXxx(this BigInteger bi) { byte[] bytes = bi.ToByteArray(); if (bytes.Length == sizeof(UT)) { return BitConverter.ToUXxx(bytes); } else if (bytes.Length == sizeof(UT) + 1) { byte[] res = new byte[sizeof(UT)]; Array.Copy(bytes, res, bytes.Length - 1); return BitConverter.ToUXxx(res); } else if (bytes.Length < sizeof(UT)) { byte[] res = new byte[sizeof(UT)]; Array.Copy(bytes, res, bytes.Length); if (bi.Sign == -1) { for (int i = 0; i < res.Length; i++) { if (res[i] == 0 && i >= bytes.Length) { res[i] = 255; } } } return BitConverter.ToUXxx(res); } else { throw new ArgumentOutOfRangeException($"bi={bi}", "The bytes length of BigInteger larger than Int32."); } }