public static IntPtr StringToHeap(string s, int index, int count, Encoding encoding)
{
if (s == null)
{
return(IntPtr.Zero);
}
if (encoding == null)
{
throw new ArgumentNullException("encoding");
}
int maxByteCount = encoding.GetMaxByteCount(1);
char[] charArray = s.ToCharArray(index, count);
byte[] numArray = new byte[encoding.GetByteCount(charArray) + maxByteCount];
if (encoding.GetBytes(charArray, 0, (int)charArray.Length, numArray, 0) != (int)numArray.Length - maxByteCount)
{
throw new NotSupportedException("encoding.GetBytes() doesn't equal encoding.GetByteCount()!");
}
IntPtr intPtr = UnixMarshal.AllocHeap((long)((int)numArray.Length));
if (intPtr == IntPtr.Zero)
{
throw new UnixIOException(Errno.ENOMEM);
}
bool flag = false;
try
{
Marshal.Copy(numArray, 0, intPtr, (int)numArray.Length);
flag = true;
}
finally
{
if (!flag)
{
UnixMarshal.FreeHeap(intPtr);
}
}
return(intPtr);
}