update

2022-12-13 22:47:31 +08:00
parent 9e7b10c1a5
commit df178687ba
40 changed files with 5401 additions and 15 deletions
@@ -0,0 +1,203 @@
+using System.Text;
+
+namespace BaseNcoding
+{
+	public class Base32 : Base
+	{
+		public const string DefaultAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
+		public const char DefaultSpecial = '>';
+
+		public override bool HasSpecial => true;
+
+		public Base32(string alphabet = DefaultAlphabet, char special = DefaultSpecial, Encoding textEncoding = null)
+		: base(32, alphabet, special, textEncoding)
+		{
+		}
+
+		public override string Encode(byte[] data)
+		{
+			int dataLength = data.Length;
+			StringBuilder result = new StringBuilder((dataLength + 4) / 5 * 8);
+
+			byte x1, x2;
+			int i;
+
+			int length5 = (dataLength / 5) * 5;
+			for (i = 0; i < length5; i += 5)
+			{
+				x1 = data[i];
+				result.Append(Alphabet[x1 >> 3]);
+
+				x2 = data[i + 1];
+				result.Append(Alphabet[((x1 << 2) & 0x1C) | (x2 >> 6)]);
+				result.Append(Alphabet[(x2 >> 1) & 0x1F]);
+
+				x1 = data[i + 2];
+				result.Append(Alphabet[((x2 << 4) & 0x10) | (x1 >> 4)]);
+
+				x2 = data[i + 3];
+				result.Append(Alphabet[((x1 << 1) & 0x1E) | (x2 >> 7)]);
+				result.Append(Alphabet[(x2 >> 2) & 0x1F]);
+
+				x1 = data[i + 4];
+				result.Append(Alphabet[((x2 << 3) & 0x18) | (x1 >> 5)]);
+				result.Append(Alphabet[x1 & 0x1F]);
+			}
+
+			switch (dataLength - length5)
+			{
+				case 1:
+					x1 = data[i];
+					result.Append(Alphabet[x1 >> 3]);
+					result.Append(Alphabet[(x1 << 2) & 0x1C]);
+
+					result.Append(Special, 6);
+					break;
+				case 2:
+					x1 = data[i];
+					result.Append(Alphabet[x1 >> 3]);
+					x2 = data[i + 1];
+					result.Append(Alphabet[((x1 << 2) & 0x1C) | (x2 >> 6)]);
+					result.Append(Alphabet[(x2 >> 1) & 0x1F]);
+					result.Append(Alphabet[(x2 << 4) & 0x10]);
+
+					result.Append(Special, 4);
+					break;
+				case 3:
+					x1 = data[i];
+					result.Append(Alphabet[x1 >> 3]);
+					x2 = data[i + 1];
+					result.Append(Alphabet[((x1 << 2) & 0x1C) | (x2 >> 6)]);
+					result.Append(Alphabet[(x2 >> 1) & 0x1F]);
+					x1 = data[i + 2];
+					result.Append(Alphabet[((x2 << 4) & 0x10) | (x1 >> 4)]);
+					result.Append(Alphabet[(x1 << 1) & 0x1E]);
+
+					result.Append(Special, 3);
+					break;
+				case 4:
+					x1 = data[i];
+					result.Append(Alphabet[x1 >> 3]);
+					x2 = data[i + 1];
+					result.Append(Alphabet[((x1 << 2) & 0x1C) | (x2 >> 6)]);
+					result.Append(Alphabet[(x2 >> 1) & 0x1F]);
+					x1 = data[i + 2];
+					result.Append(Alphabet[((x2 << 4) & 0x10) | (x1 >> 4)]);
+					x2 = data[i + 3];
+					result.Append(Alphabet[((x1 << 1) & 0x1E) | (x2 >> 7)]);
+					result.Append(Alphabet[(x2 >> 2) & 0x1F]);
+					result.Append(Alphabet[(x2 << 3) & 0x18]);
+
+					result.Append(Special);
+					break;
+			}
+
+			return result.ToString();
+		}
+
+		public override byte[] Decode(string data)
+		{
+			unchecked
+			{
+				if (string.IsNullOrEmpty(data))
+					return new byte[0];
+
+				int additionalBytes = 0, diff = 0, tempLen = 0;
+
+
+				int lastSpecialInd = data.Length;
+				while (data[lastSpecialInd - 1] == Special)
+					lastSpecialInd--;
+				int tailLength = data.Length - lastSpecialInd;
+
+				switch (tailLength)
+				{
+					case 6:
+						additionalBytes = 4;
+						break;
+					case 4:
+						additionalBytes = 3;
+						break;
+					case 3:
+						additionalBytes = 2;
+						break;
+					case 1:
+						additionalBytes = 1;
+						break;
+				}
+
+				diff = tailLength - additionalBytes;
+				tailLength = additionalBytes;
+				tempLen = data.Length - diff;
+
+				byte[] result = new byte[(tempLen + 7) / 8 * 5 - tailLength];
+				int length5 = result.Length / 5 * 5;
+				int x1, x2, x3, x4, x5, x6, x7, x8;
+
+				int i, srcInd = 0;
+				for (i = 0; i < length5; i += 5)
+				{
+					x1 = InvAlphabet[data[srcInd++]];
+					x2 = InvAlphabet[data[srcInd++]];
+					x3 = InvAlphabet[data[srcInd++]];
+					x4 = InvAlphabet[data[srcInd++]];
+					x5 = InvAlphabet[data[srcInd++]];
+					x6 = InvAlphabet[data[srcInd++]];
+					x7 = InvAlphabet[data[srcInd++]];
+					x8 = InvAlphabet[data[srcInd++]];
+
+					result[i] = (byte)((x1 << 3) | ((x2 >> 2) & 0x07));
+					result[i + 1] = (byte)((x2 << 6) | ((x3 << 1) & 0x3E) | ((x4 >> 4) & 0x01));
+					result[i + 2] = (byte)((x4 << 4) | ((x5 >> 1) & 0xF));
+					result[i + 3] = (byte)((x5 << 7) | ((x6 << 2) & 0x7C) | ((x7 >> 3) & 0x03));
+					result[i + 4] = (byte)((x7 << 5) | (x8 & 0x1F));
+				}
+
+				switch (tailLength)
+				{
+					case 4:
+						x1 = InvAlphabet[data[srcInd++]];
+						x2 = InvAlphabet[data[srcInd++]];
+						result[i] = (byte)((x1 << 3) | ((x2 >> 2) & 0x07));
+						break;
+					case 3:
+						x1 = InvAlphabet[data[srcInd++]];
+						x2 = InvAlphabet[data[srcInd++]];
+						x3 = InvAlphabet[data[srcInd++]];
+						x4 = InvAlphabet[data[srcInd++]];
+
+						result[i] = (byte)((x1 << 3) | ((x2 >> 2) & 0x07));
+						result[i + 1] = (byte)((x2 << 6) | ((x3 << 1) & 0x3E) | ((x4 >> 4) & 0x01));
+						break;
+					case 2:
+						x1 = InvAlphabet[data[srcInd++]];
+						x2 = InvAlphabet[data[srcInd++]];
+						x3 = InvAlphabet[data[srcInd++]];
+						x4 = InvAlphabet[data[srcInd++]];
+						x5 = InvAlphabet[data[srcInd++]];
+
+						result[i] = (byte)((x1 << 3) | ((x2 >> 2) & 0x07));
+						result[i + 1] = (byte)((x2 << 6) | ((x3 << 1) & 0x3E) | ((x4 >> 4) & 0x01));
+						result[i + 2] = (byte)((x4 << 4) | ((x5 >> 1) & 0xF));
+						break;
+					case 1:
+						x1 = InvAlphabet[data[srcInd++]];
+						x2 = InvAlphabet[data[srcInd++]];
+						x3 = InvAlphabet[data[srcInd++]];
+						x4 = InvAlphabet[data[srcInd++]];
+						x5 = InvAlphabet[data[srcInd++]];
+						x6 = InvAlphabet[data[srcInd++]];
+						x7 = InvAlphabet[data[srcInd++]];
+
+						result[i] = (byte)((x1 << 3) | ((x2 >> 2) & 0x07));
+						result[i + 1] = (byte)((x2 << 6) | ((x3 << 1) & 0x3E) | ((x4 >> 4) & 0x01));
+						result[i + 2] = (byte)((x4 << 4) | ((x5 >> 1) & 0xF));
+						result[i + 3] = (byte)((x5 << 7) | ((x6 << 2) & 0x7C) | ((x7 >> 3) & 0x03));
+						break;
+				}
+
+				return result;
+			}
+		}
+	}
+}