C#

byte []hexValues = new byte[text.Length /3 + 1];
			
int index = 0;
for (int i = 0; i<text.Length; i += 2, index++)
{
   string currentHexValue = text[i].ToString();
   if ( i + 1 < text.Length)
   currentHexValue += text[i+1].ToString();
   try
   {
	hexValues[index] = byte.Parse(currentHexValue, System.Globalization.NumberStyles.AllowHexSpecifier);
   }
   catch(Exception)
   {
      if (currentHexValue == "00")
	return new byte[] {0};
      else
	// Throw exception
   }
}