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);
}
private static int GetRandomBufferLength(IntPtr p, int nullLength)
{
int num;
int num1;
int num2;
switch (nullLength)
{
case 1:
{
return((void *)(checked ((int)Stdlib.strlen(p))));
}
case 2:
{
return(UnixMarshal.GetInt16BufferLength(p));
}
case 3:
{
num = 0;
num1 = 0;
do
{
num2 = num;
num = num2 + 1;
if (Marshal.ReadByte(p, num2) != 0)
{
num1 = 0;
}
else
{
num1++;
}
}while (num1 != nullLength);
return(num);
}
case 4:
{
return(UnixMarshal.GetInt32BufferLength(p));
}
default:
{
num = 0;
num1 = 0;
do
{
num2 = num;
num = num2 + 1;
if (Marshal.ReadByte(p, num2) != 0)
{
num1 = 0;
}
else
{
num1++;
}
}while (num1 != nullLength);
return(num);
}
}
}
