init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Utilities/Encoders/HexEncoder.cs

@@ -0,0 +1,112 @@
+using System.IO;
+
+namespace Org.BouncyCastle.Utilities.Encoders;
+
+public class HexEncoder : IEncoder
+{
+	protected readonly byte[] encodingTable = new byte[16]
+	{
+		48, 49, 50, 51, 52, 53, 54, 55, 56, 57,
+		97, 98, 99, 100, 101, 102
+	};
+
+	protected readonly byte[] decodingTable = new byte[128];
+
+	protected void InitialiseDecodingTable()
+	{
+		Arrays.Fill(decodingTable, byte.MaxValue);
+		for (int i = 0; i < encodingTable.Length; i++)
+		{
+			decodingTable[encodingTable[i]] = (byte)i;
+		}
+		decodingTable[65] = decodingTable[97];
+		decodingTable[66] = decodingTable[98];
+		decodingTable[67] = decodingTable[99];
+		decodingTable[68] = decodingTable[100];
+		decodingTable[69] = decodingTable[101];
+		decodingTable[70] = decodingTable[102];
+	}
+
+	public HexEncoder()
+	{
+		InitialiseDecodingTable();
+	}
+
+	public int Encode(byte[] data, int off, int length, Stream outStream)
+	{
+		for (int i = off; i < off + length; i++)
+		{
+			int num = data[i];
+			outStream.WriteByte(encodingTable[num >> 4]);
+			outStream.WriteByte(encodingTable[num & 0xF]);
+		}
+		return length * 2;
+	}
+
+	private static bool Ignore(char c)
+	{
+		if (c != '\n' && c != '\r' && c != '\t')
+		{
+			return c == ' ';
+		}
+		return true;
+	}
+
+	public int Decode(byte[] data, int off, int length, Stream outStream)
+	{
+		int num = 0;
+		int num2 = off + length;
+		while (num2 > off && Ignore((char)data[num2 - 1]))
+		{
+			num2--;
+		}
+		int i = off;
+		while (i < num2)
+		{
+			for (; i < num2 && Ignore((char)data[i]); i++)
+			{
+			}
+			byte b = decodingTable[data[i++]];
+			for (; i < num2 && Ignore((char)data[i]); i++)
+			{
+			}
+			byte b2 = decodingTable[data[i++]];
+			if ((b | b2) >= 128)
+			{
+				throw new IOException("invalid characters encountered in Hex data");
+			}
+			outStream.WriteByte((byte)((b << 4) | b2));
+			num++;
+		}
+		return num;
+	}
+
+	public int DecodeString(string data, Stream outStream)
+	{
+		int num = 0;
+		int num2 = data.Length;
+		while (num2 > 0 && Ignore(data[num2 - 1]))
+		{
+			num2--;
+		}
+		int i = 0;
+		while (i < num2)
+		{
+			for (; i < num2 && Ignore(data[i]); i++)
+			{
+			}
+			byte b = decodingTable[(uint)data[i++]];
+			for (; i < num2 && Ignore(data[i]); i++)
+			{
+			}
+			byte b2 = decodingTable[(uint)data[i++]];
+			if ((b | b2) >= 128)
+			{
+				throw new IOException("invalid characters encountered in Hex data");
+			}
+			outStream.WriteByte((byte)((b << 4) | b2));
+			num++;
+		}
+		return num;
+	}
+}