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<no name> by Anonymous

using System;
using System.IO;
using System.Text;


public class Program
{
	public static void Main()
	{
		byte[] x = { 97, 98, 99, 100};
        string s = x.ToBase62();
        byte[] x2 = s.FromBase62();
		Console.WriteLine(Encoding.UTF8.GetString(x2));
	}
}


    public static class EncodingExtensions
    {
        private static string Base62CodingSpace = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

        /// <summary>
        /// Convert a byte array
        /// </summary>
        /// <param name="original">Byte array</param>
        /// <returns>Base62 string</returns>
        public static string ToBase62(this byte[] original)
        {
            StringBuilder sb = new StringBuilder();
            BitStream stream = new BitStream(original);         // Set up the BitStream
            byte[] read = new byte[1];                          // Only read 6-bit at a time
            while (true)
            {
                read[0] = 0;
                int length = stream.Read(read, 0, 6);           // Try to read 6 bits
                if (length == 6)                                // Not reaching the end
                {
                    if ((int)(read[0] >> 3) == 0x1f)            // First 5-bit is 11111
                    {
                        sb.Append(Base62CodingSpace[61]);
                        stream.Seek(-1, SeekOrigin.Current);    // Leave the 6th bit to next group
                    }
                    else if ((int)(read[0] >> 3) == 0x1e)       // First 5-bit is 11110
                    {
                        sb.Append(Base62CodingSpace[60]);
                        stream.Seek(-1, SeekOrigin.Current);
                    }
                    else                                        // Encode 6-bit
                    {
                        sb.Append(Base62CodingSpace[(int)(read[0] >> 2)]);
                    }
                }
                else if (length == 0)                           // Reached the end completely
                {
                    break;
                }
                else                                            // Reached the end with some bits left
                {
                    // Padding 0s to make the last bits to 6 bit
                    sb.Append(Base62CodingSpace[(int)(read[0] >> (int)(8 - length))]);
                    break;
                }
            }
            return sb.ToString();
        }

        /// <summary>
        /// Convert a Base62 string to byte array
        /// </summary>
        /// <param name="base62">Base62 string</param>
        /// <returns>Byte array</returns>
        public static byte[] FromBase62(this string base62)
        {
            // Character count
            int count = 0;

            // Set up the BitStream
            BitStream stream = new BitStream(base62.Length * 6 / 8);

            foreach (char c in base62)
            {
                // Look up coding table
                int index = Base62CodingSpace.IndexOf(c);

                // If end is reached
                if (count == base62.Length - 1)
                {
                    // Check if the ending is good
                    int mod = (int)(stream.Position % 8);
                    if (mod == 0)
                        throw new InvalidDataException("an extra character was found");

                    if ((index >> (8 - mod)) > 0)
                        throw new InvalidDataException("invalid ending character was found");

                    stream.Write(new byte[] { (byte)(index << mod) }, 0, 8 - mod);
                }
                else
                {
                    // If 60 or 61 then only write 5 bits to the stream, otherwise 6 bits.
                    if (index == 60)
                    {
                        stream.Write(new byte[] { 0xf0 }, 0, 5);
                    }
                    else if (index == 61)
                    {
                        stream.Write(new byte[] { 0xf8 }, 0, 5);
                    }
                    else
                    {
                        stream.Write(new byte[] { (byte)index }, 2, 6);
                    }
                }
                count++;
            }

            // Dump out the bytes
            byte[] result = new byte[stream.Position / 8];
            stream.Seek(0, SeekOrigin.Begin);
            stream.Read(result, 0, result.Length * 8);
            return result;
        }
    
		    /// <summary>
    /// Utility that read and write bits in byte array
    /// </summary>
    public class BitStream : Stream
    {
        private byte[] Source { get; set; }

        /// <summary>
        /// Initialize the stream with capacity
        /// </summary>
        /// <param name="capacity">Capacity of the stream</param>
        public BitStream(int capacity)
        {
            this.Source = new byte[capacity];
        }

        /// <summary>
        /// Initialize the stream with a source byte array
        /// </summary>
        /// <param name="source"></param>
        public BitStream(byte[] source)
        {
            this.Source = source;
        }

        public override bool CanRead
        {
            get { return true; }
        }

        public override bool CanSeek
        {
            get { return true; }
        }

        public override bool CanWrite
        {
            get { return true; }
        }

        public override void Flush()
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// Bit length of the stream
        /// </summary>
        public override long Length
        {
            get { return Source.Length * 8; }
        }

        /// <summary>
        /// Bit position of the stream
        /// </summary>
        public override long Position { get; set; }

        /// <summary>
        /// Read the stream to the buffer
        /// </summary>
        /// <param name="buffer">Buffer</param>
        /// <param name="offset">Offset bit start position of the stream</param>
        /// <param name="count">Number of bits to read</param>
        /// <returns>Number of bits read</returns>
        public override int Read(byte[] buffer, int offset, int count)
        {
            // Temporary position cursor
            long tempPos = this.Position;
            tempPos += offset;

            // Buffer byte position and in-byte position
            int readPosCount = 0, readPosMod = 0;

            // Stream byte position and in-byte position
            long posCount = tempPos >> 3;
            int posMod = (int)(tempPos - ((tempPos >> 3) << 3));

            while (tempPos < this.Position + offset + count && tempPos < this.Length)
            {
                // Copy the bit from the stream to buffer
                if ((((int)this.Source[posCount]) & (0x1 << (7 - posMod))) != 0)
                {
                    buffer[readPosCount] = (byte)((int)(buffer[readPosCount]) | (0x1 << (7 - readPosMod)));
                }
                else
                {
                    buffer[readPosCount] = (byte)((int)(buffer[readPosCount]) & (0xffffffff - (0x1 << (7 - readPosMod))));
                }

                // Increment position cursors
                tempPos++;
                if (posMod == 7)
                {
                    posMod = 0;
                    posCount++;
                }
                else
                {
                    posMod++;
                }
                if (readPosMod == 7)
                {
                    readPosMod = 0;
                    readPosCount++;
                }
                else
                {
                    readPosMod++;
                }
            }
            int bits = (int)(tempPos - this.Position - offset);
            this.Position = tempPos;
            return bits;
        }

        /// <summary>
        /// Set up the stream position
        /// </summary>
        /// <param name="offset">Position</param>
        /// <param name="origin">Position origin</param>
        /// <returns>Position after setup</returns>
        public override long Seek(long offset, SeekOrigin origin)
        {
            switch (origin)
            {
                case (SeekOrigin.Begin):
                    {
                        this.Position = offset;
                        break;
                    }
                case (SeekOrigin.Current):
                    {
                        this.Position += offset;
                        break;
                    }
                case (SeekOrigin.End):
                    {
                        this.Position = this.Length + offset;
                        break;
                    }
            }
            return this.Position;
        }

        public override void SetLength(long value)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// Write from buffer to the stream
        /// </summary>
        /// <param name="buffer"></param>
        /// <param name="offset">Offset start bit position of buffer</param>
        /// <param name="count">Number of bits</param>
        public override void Write(byte[] buffer, int offset, int count)
        {
            // Temporary position cursor
            long tempPos = this.Position;

            // Buffer byte position and in-byte position
            int readPosCount = offset >> 3, readPosMod = offset - ((offset >> 3) << 3);

            // Stream byte position and in-byte position
            long posCount = tempPos >> 3;
            int posMod = (int)(tempPos - ((tempPos >> 3) << 3));

            while (tempPos < this.Position + count && tempPos < this.Length)
            {
                // Copy the bit from buffer to the stream
                if ((((int)buffer[readPosCount]) & (0x1 << (7 - readPosMod))) != 0)
                {
                    this.Source[posCount] = (byte)((int)(this.Source[posCount]) | (0x1 << (7 - posMod)));
                }
                else
                {
                    this.Source[posCount] = (byte)((int)(this.Source[posCount]) & (0xffffffff - (0x1 << (7 - posMod))));
                }

                // Increment position cursors
                tempPos++;
                if (posMod == 7)
                {
                    posMod = 0;
                    posCount++;
                }
                else
                {
                    posMod++;
                }
                if (readPosMod == 7)
                {
                    readPosMod = 0;
                    readPosCount++;
                }
                else
                {
                    readPosMod++;
                }
            }
            this.Position = tempPos;
        }
    }
}

​x
 
using System;
using System.IO;
using System.Text;
​
​
public class Program
{
    public static void Main()
    {
        byte[] x = { 97, 98, 99, 100};
        string s = x.ToBase62();
        byte[] x2 = s.FromBase62();
        Console.WriteLine(Encoding.UTF8.GetString(x2));
    }
}
​
​
    public static class EncodingExtensions
    {
        private static string Base62CodingSpace = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
​
        /// <summary>
        /// Convert a byte array
        /// </summary>
        /// <param name="original">Byte array</param>
        /// <returns>Base62 string</returns>
        public static string ToBase62(this byte[] original)
        {
            StringBuilder sb = new StringBuilder();
            BitStream stream = new BitStream(original);         // Set up the BitStream
            byte[] read = new byte[1];                          // Only read 6-bit at a time
            while (true)
            {
                read[0] = 0;
                int length = stream.Read(read, 0, 6);           // Try to read 6 bits
                if (length == 6)                                // Not reaching the end
                {
                    if ((int)(read[0] >> 3) == 0x1f)            // First 5-bit is 11111
                    {
                        sb.Append(Base62CodingSpace[61]);
                        stream.Seek(-1, SeekOrigin.Current);    // Leave the 6th bit to next group
                    }
                    else if ((int)(read[0] >> 3) == 0x1e)       // First 5-bit is 11110
                    {
                        sb.Append(Base62CodingSpace[60]);
                        stream.Seek(-1, SeekOrigin.Current);
                    }
                    else                                        // Encode 6-bit
                    {
                        sb.Append(Base62CodingSpace[(int)(read[0] >> 2)]);
                    }
                }
                else if (length == 0)                           // Reached the end completely
                {
                    break;
                }
                else                                            // Reached the end with some bits left
                {
                    // Padding 0s to make the last bits to 6 bit
                    sb.Append(Base62CodingSpace[(int)(read[0] >> (int)(8 - length))]);
                    break;
                }
            }
            return sb.ToString();
        }
​
        /// <summary>
        /// Convert a Base62 string to byte array
        /// </summary>
        /// <param name="base62">Base62 string</param>
        /// <returns>Byte array</returns>
        public static byte[] FromBase62(this string base62)
        {
            // Character count
            int count = 0;
​
            // Set up the BitStream
            BitStream stream = new BitStream(base62.Length * 6 / 8);
​
            foreach (char c in base62)
            {
                // Look up coding table
                int index = Base62CodingSpace.IndexOf(c);
​
                // If end is reached
                if (count == base62.Length - 1)
                {
                    // Check if the ending is good
                    int mod = (int)(stream.Position % 8);
                    if (mod == 0)
                        throw new InvalidDataException("an extra character was found");
​
                    if ((index >> (8 - mod)) > 0)
                        throw new InvalidDataException("invalid ending character was found");
​
                    stream.Write(new byte[] { (byte)(index << mod) }, 0, 8 - mod);
                }
                else
                {
                    // If 60 or 61 then only write 5 bits to the stream, otherwise 6 bits.
                    if (index == 60)
                    {
                        stream.Write(new byte[] { 0xf0 }, 0, 5);
                    }
                    else if (index == 61)
                    {
                        stream.Write(new byte[] { 0xf8 }, 0, 5);
                    }
                    else
                    {
                        stream.Write(new byte[] { (byte)index }, 2, 6);
                    }
                }
                count++;
            }
​
            // Dump out the bytes
            byte[] result = new byte[stream.Position / 8];
            stream.Seek(0, SeekOrigin.Begin);
            stream.Read(result, 0, result.Length * 8);
            return result;
        }
    
            /// <summary>
    /// Utility that read and write bits in byte array
    /// </summary>
    public class BitStream : Stream
    {
        private byte[] Source { get; set; }
​
        /// <summary>
        /// Initialize the stream with capacity
        /// </summary>
        /// <param name="capacity">Capacity of the stream</param>
        public BitStream(int capacity)
        {
            this.Source = new byte[capacity];
        }
​
        /// <summary>
        /// Initialize the stream with a source byte array
        /// </summary>
        /// <param name="source"></param>
        public BitStream(byte[] source)
        {
            this.Source = source;
        }
​
        public override bool CanRead
        {
            get { return true; }
        }
​
        public override bool CanSeek
        {
            get { return true; }
        }
​
        public override bool CanWrite
        {
            get { return true; }
        }
​
        public override void Flush()
        {
            throw new NotImplementedException();
        }
​
        /// <summary>
        /// Bit length of the stream
        /// </summary>
        public override long Length
        {
            get { return Source.Length * 8; }
        }
​
        /// <summary>
        /// Bit position of the stream
        /// </summary>
        public override long Position { get; set; }
​
        /// <summary>
        /// Read the stream to the buffer
        /// </summary>
        /// <param name="buffer">Buffer</param>
        /// <param name="offset">Offset bit start position of the stream</param>
        /// <param name="count">Number of bits to read</param>
        /// <returns>Number of bits read</returns>
        public override int Read(byte[] buffer, int offset, int count)
        {
            // Temporary position cursor
            long tempPos = this.Position;
            tempPos += offset;
​
            // Buffer byte position and in-byte position
            int readPosCount = 0, readPosMod = 0;
​
            // Stream byte position and in-byte position
            long posCount = tempPos >> 3;
            int posMod = (int)(tempPos - ((tempPos >> 3) << 3));
​
            while (tempPos < this.Position + offset + count && tempPos < this.Length)
            {
                // Copy the bit from the stream to buffer
                if ((((int)this.Source[posCount]) & (0x1 << (7 - posMod))) != 0)
                {
                    buffer[readPosCount] = (byte)((int)(buffer[readPosCount]) | (0x1 << (7 - readPosMod)));
                }
                else
                {
                    buffer[readPosCount] = (byte)((int)(buffer[readPosCount]) & (0xffffffff - (0x1 << (7 - readPosMod))));
                }
​
                // Increment position cursors
                tempPos++;
                if (posMod == 7)
                {
                    posMod = 0;
                    posCount++;
                }
                else
                {
                    posMod++;
                }
                if (readPosMod == 7)
                {
                    readPosMod = 0;
                    readPosCount++;
                }
                else
                {
                    readPosMod++;
                }
            }
            int bits = (int)(tempPos - this.Position - offset);
            this.Position = tempPos;
            return bits;
        }
​
        /// <summary>
        /// Set up the stream position
        /// </summary>
        /// <param name="offset">Position</param>
        /// <param name="origin">Position origin</param>
        /// <returns>Position after setup</returns>
        public override long Seek(long offset, SeekOrigin origin)
        {
            switch (origin)
            {
                case (SeekOrigin.Begin):
                    {
                        this.Position = offset;
                        break;
                    }
                case (SeekOrigin.Current):
                    {
                        this.Position += offset;
                        break;
                    }
                case (SeekOrigin.End):
                    {
                        this.Position = this.Length + offset;
                        break;
                    }
            }
            return this.Position;
        }
​
        public override void SetLength(long value)
        {
            throw new NotImplementedException();
        }
​
        /// <summary>
        /// Write from buffer to the stream
        /// </summary>
        /// <param name="buffer"></param>
        /// <param name="offset">Offset start bit position of buffer</param>
        /// <param name="count">Number of bits</param>
        public override void Write(byte[] buffer, int offset, int count)
        {
            // Temporary position cursor
            long tempPos = this.Position;
​
            // Buffer byte position and in-byte position
            int readPosCount = offset >> 3, readPosMod = offset - ((offset >> 3) << 3);
​
            // Stream byte position and in-byte position
            long posCount = tempPos >> 3;
            int posMod = (int)(tempPos - ((tempPos >> 3) << 3));
​
            while (tempPos < this.Position + count && tempPos < this.Length)
            {
                // Copy the bit from buffer to the stream
                if ((((int)buffer[readPosCount]) & (0x1 << (7 - readPosMod))) != 0)
                {
                    this.Source[posCount] = (byte)((int)(this.Source[posCount]) | (0x1 << (7 - posMod)));
                }
                else
                {
                    this.Source[posCount] = (byte)((int)(this.Source[posCount]) & (0xffffffff - (0x1 << (7 - posMod))));
                }
​
                // Increment position cursors
                tempPos++;
                if (posMod == 7)
                {
                    posMod = 0;
                    posCount++;
                }
                else
                {
                    posMod++;
                }
                if (readPosMod == 7)
                {
                    readPosMod = 0;
                    readPosCount++;
                }
                else
                {
                    readPosMod++;
                }
            }
            this.Position = tempPos;
        }
    }
}

Aquest programa demana un valor introduit per teclar i diu si es un signe de puntuació (, . ; :), un xifra numèrica o un altre caràcter
Introduiex un valor:

Last Run:	7:23:25 pm
Compile:	0.111s
Execute:	0s
Memory:	32kb
CPU:	0s

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