[+] 完成核心代码的编写

RevokeMsgPatcher/Utils/FileUtil.cs

@@ -0,0 +1,59 @@
+using System.Diagnostics;
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace RevokeMsgPatcher.Utils
+{
+    public class FileUtil
+    {
+        /// <summary>
+        /// 获取文件版本
+        /// </summary>
+        /// <param name="path"></param>
+        /// <returns></returns>
+        public static string GetFileVersion(string path)
+        {
+            FileVersionInfo fileVersionInfo = FileVersionInfo.GetVersionInfo(path);
+            return fileVersionInfo.FileVersion;
+        }
+
+        /// <summary>
+        /// 计算文件SHA1
+        /// </summary>
+        /// <param name="s">文件路径</param>
+        /// <returns></returns>
+        public static string ComputeFileSHA1(string s)
+        {
+            FileStream file = new FileStream(s, FileMode.Open);
+            SHA1 sha1 = new SHA1CryptoServiceProvider();
+            byte[] retval = sha1.ComputeHash(file);
+            file.Close();
+
+            StringBuilder sc = new StringBuilder();
+            for (int i = 0; i < retval.Length; i++)
+            {
+                sc.Append(retval[i].ToString("x2"));
+            }
+            return sc.ToString();
+        }
+
+        /// <summary>
+        /// 修改文件指定位置的字节
+        /// </summary>
+        /// <param name="path">WeChatWin.dll 的路径</param>
+        /// <param name="position">偏移位置</param>
+        /// <param name="after">修改后的值</param>
+        /// <returns></returns>
+        public static bool EditHex(string path, long position, byte after)
+        {
+            using (var stream = new FileStream(path, FileMode.Open, FileAccess.ReadWrite))
+            {
+                stream.Position = position;
+                stream.WriteByte(after);
+            }
+            return true;
+
+        }
+    }
+}