Replace two bytes in a generic list

.net, c#

Solution

You can do something like this - it'll be slightly slower, though:

public static void RemoveEscapeSequences(List<byte> message)
{
    var replaceBytes = new Dictionary<byte, byte>()
    {
        {0x00, 0xF8}, {0x01, 0xFB}, {0x02, 0xFD}, {0x03, 0xFE}
    };

    // skipped parameter checks
    for (int index = 0; index < message.Count - 1; ++index)
    {
        if (message[index] == 0xF8)
        {
            if(replaceBytes.ContainsKey(message[index + 1]))
            {
                message[index] = replaceBytes[message[index + 1]];
                message.RemoveAt(index + 1);
            }
        }
    }
}

Problem

I want to replace every occurrence of one of those magic 2-byte packages in my `List<byte>` with a single byte: { 0xF8, 0x00 } -> Replace with 0xF8 { 0xF8, 0x01 } -> Replace with 0xFB { 0xF8, 0x02 } -> Replace with 0xFD { 0xF8, 0x03 } -> Replace with 0xFE For example: ``` List<byte> message = new List<byte> { 0xFF, 0xFF, 0xFB, 0xF8, 0x00, 0xF8, 0x01, 0xF8, 0x02, 0xF8, 0x03, 0xFE }; // will be converted to: List<byte> expected = new List<byte> { 0xFF, 0xFF, 0xFB, 0xF8, 0xFB, 0xFD, 0xFE, 0xFE }; ``` This is my solution so far, which works but I don't like it because its readability is quite bad: ``` public static void RemoveEscapeSequences(List<byte> message) { // skipped parameter checks for (int index = 0; index < message.Count - 1; ++index) { if (message[index] == 0xF8) { // found an escaped byte, look at the following byte to determine replacement switch (message[index + 1]) { case 0x0: message[index] = 0xF8; message.RemoveAt(index + 1); break; case 0x1: message[index] = 0xFB; message.RemoveAt(index + 1); break; case 0x2: message[index] = 0xFD; message.RemoveAt(index + 1); break; case 0x3: message[index] = 0xFE; message.RemoveAt(index + 1); break; } } } } ``` Is there a shorter solution with improved readability?

Original source