hex dump

HexDump.cs

static void Main(string[] args)
{
    var buffer = g().ToArray();

    Console.WriteLine(HexDump(buffer));

    IEnumerable<byte> g(){
        foreach(var i in Enumerable.Range(0, 256)){
            yield return (byte)i;
        }
    }
}

public static string HexDump(byte[] bytes, int bytesPerLine = 16)
{
    if (bytes == null) return "<null>";
    int bytesLength = bytes.Length;

    char[] HexChars = "0123456789ABCDEF".ToCharArray();

    int firstHexColumn =
          8                   // 8 characters for the address
        + 3;                  // 3 spaces

    int firstCharColumn = firstHexColumn
        + bytesPerLine * 3       // - 2 digit for the hexadecimal value and 1 space
        + (bytesPerLine - 1) / 8 // - 1 extra space every 8 characters from the 9th
        + 2;                  // 2 spaces 

    int lineLength = firstCharColumn
        + bytesPerLine           // - characters to show the ascii value
        + Environment.NewLine.Length; // Carriage return and line feed (should normally be 2)

    char[] line = (new String(' ', lineLength - Environment.NewLine.Length) + Environment.NewLine).ToCharArray();
    int expectedLines = (bytesLength + bytesPerLine - 1) / bytesPerLine;
    StringBuilder result = new StringBuilder(expectedLines * lineLength);

    for (int i = 0; i < bytesLength; i += bytesPerLine)
    {
        line[0] = HexChars[(i >> 28) & 0xF];
        line[1] = HexChars[(i >> 24) & 0xF];
        line[2] = HexChars[(i >> 20) & 0xF];
        line[3] = HexChars[(i >> 16) & 0xF];
        line[4] = HexChars[(i >> 12) & 0xF];
        line[5] = HexChars[(i >> 8) & 0xF];
        line[6] = HexChars[(i >> 4) & 0xF];
        line[7] = HexChars[(i >> 0) & 0xF];

        int hexColumn = firstHexColumn;
        int charColumn = firstCharColumn;

        for (int j = 0; j < bytesPerLine; j++)
        {
            if (j > 0 && (j & 7) == 0) hexColumn++;
            if (i + j >= bytesLength)
            {
                line[hexColumn] = ' ';
                line[hexColumn + 1] = ' ';
                line[charColumn] = ' ';
            }
            else
            {
                byte b = bytes[i + j];
                line[hexColumn] = HexChars[(b >> 4) & 0xF];
                line[hexColumn + 1] = HexChars[b & 0xF];
                line[charColumn] = (b < 32 || b >= 127 ? '·' : (char)b);
            }
            hexColumn += 3;
            charColumn++;
        }
        result.Append(line);
    }
    return result.ToString();
}