private static int GetStringByteLength(IntPtr p, Encoding encoding)
{
Type type = encoding.GetType();
int num = -1;
if (typeof(UTF8Encoding).IsAssignableFrom(type) || typeof(UTF7Encoding).IsAssignableFrom(type) || typeof(UnixEncoding).IsAssignableFrom(type) || typeof(ASCIIEncoding).IsAssignableFrom(type))
{
num = (void *)(checked ((int)Stdlib.strlen(p)));
}
else
{
num = (!typeof(UnicodeEncoding).IsAssignableFrom(type) ? UnixMarshal.GetRandomBufferLength(p, encoding.GetMaxByteCount(1)) : UnixMarshal.GetInt16BufferLength(p));
}
if (num == -1)
{
throw new NotSupportedException("Unable to determine native string buffer length");
}
return(num);
}