This works, please try it:
class Program
{
private static readonly byte[] SpecialSequence = new byte[] { 0, 1, 0, 31, 32 };
private static void Main(string[] args)
{
int fileLength;
byte[] fileContent;
using (var fileStream = new FileStream(@"C:\Users\frann\Desktop\FICHEROS\P1.pgm", FileMode.Open, FileAccess.Read))
{
fileLength = (int)fileStream.Length;
fileContent = new byte[fileLength];
fileStream.Read(fileContent, 0, fileLength);
}
Console.WriteLine(fileLength);
for (int p = 0; p < fileLength; )
{
if (DetectSequence(fileContent, p))
{
Console.ForegroundColor = ConsoleColor.Red;
foreach (byte specialByte in SpecialSequence)
{
Console.Write(@"{0} ", specialByte);
}
Console.ForegroundColor = ConsoleColor.White;
p += SpecialSequence.Length;
continue;
}
int byteRead = fileContent[p];
Console.Write(@"{0} ", byteRead);
p++;
}
// Wait for user input.
Console.ReadKey();
}
private static bool DetectSequence1(IList<byte> fileContent, int position)
{
if (position + SpecialSequence.Length > fileContent.Count) return false;
for (int i = 0; i < SpecialSequence.Length; i++)
{
if (fileContent[position + i] != SpecialSequence[i]) return false;
}
return true;
}
}
It can be a little more optimized, but this is more clear.
