chore:目录重构

Yi.Furion.Net6/Yi.Framework.Infrastructure/Helper/Base32Helper.cs

@@ -0,0 +1,101 @@
+using System;
+using System.Text;
+
+namespace Yi.Framework.Infrastructure.Helper
+{
+    public sealed class Base32Helper
+    {
+
+        // the valid chars for the encoding
+        private static string ValidChars = "QAZ2WSX3" + "EDC4RFV5" + "TGB6YHN7" + "UJM8K9LP";
+
+        /// <summary>
+        /// Converts an array of bytes to a Base32-k string.
+        /// </summary>
+        public static string ToString(byte[] bytes)
+        {
+            StringBuilder sb = new StringBuilder();         // holds the base32 chars
+            byte index;
+            int hi = 5;
+            int currentByte = 0;
+
+            while (currentByte < bytes.Length)
+            {
+                // do we need to use the next byte?
+                if (hi > 8)
+                {
+                    // get the last piece from the current byte, shift it to the right
+                    // and increment the byte counter
+                    index = (byte)(bytes[currentByte++] >> hi - 5);
+                    if (currentByte != bytes.Length)
+                    {
+                        // if we are not at the end, get the first piece from
+                        // the next byte, clear it and shift it to the left
+                        index = (byte)((byte)(bytes[currentByte] << 16 - hi) >> 3 | index);
+                    }
+
+                    hi -= 3;
+                }
+                else if (hi == 8)
+                {
+                    index = (byte)(bytes[currentByte++] >> 3);
+                    hi -= 3;
+                }
+                else
+                {
+
+                    // simply get the stuff from the current byte
+                    index = (byte)((byte)(bytes[currentByte] << 8 - hi) >> 3);
+                    hi += 5;
+                }
+
+                sb.Append(ValidChars[index]);
+            }
+
+            return sb.ToString();
+        }
+
+
+        /// <summary>
+        /// Converts a Base32-k string into an array of bytes.
+        /// </summary>
+        /// <exception cref="ArgumentException">
+        /// Input string <paramref name="s">s</paramref> contains invalid Base32-k characters.
+        /// </exception>
+        public static byte[] FromBase32String(string str)
+        {
+            int numBytes = str.Length * 5 / 8;
+            byte[] bytes = new byte[numBytes];
+
+            // all UPPERCASE chars
+            str = str.ToUpper();
+
+            int bit_buffer;
+            int currentCharIndex;
+            int bits_in_buffer;
+
+            if (str.Length < 3)
+            {
+                bytes[0] = (byte)(ValidChars.IndexOf(str[0]) | ValidChars.IndexOf(str[1]) << 5);
+                return bytes;
+            }
+
+            bit_buffer = ValidChars.IndexOf(str[0]) | ValidChars.IndexOf(str[1]) << 5;
+            bits_in_buffer = 10;
+            currentCharIndex = 2;
+            for (int i = 0; i < bytes.Length; i++)
+            {
+                bytes[i] = (byte)bit_buffer;
+                bit_buffer >>= 8;
+                bits_in_buffer -= 8;
+                while (bits_in_buffer < 8 && currentCharIndex < str.Length)
+                {
+                    bit_buffer |= ValidChars.IndexOf(str[currentCharIndex++]) << bits_in_buffer;
+                    bits_in_buffer += 5;
+                }
+            }
+
+            return bytes;
+        }
+    }
+}