client/server file send problem

(These are just the relevant snippets from my program for my question. out and in are the socket streams, im sure you can see what the rest is)
This snippet here is for the client to send the file to the server, encrypted..

Code:

---

                        Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
                        cipher.init(Cipher.ENCRYPT_MODE, secretKey);

                        // Send file
                        FileInputStream fin = new FileInputStream(file);
                        byte[] buffer = new byte[8192];
                        byte[] bout = null;
                        int length;

                        while (true) {
                            length = fin.read(buffer);
                            out.writeInt(length);
                            if (length == -1) break;

                            bout = cipher.update(buffer, 0, length);
                            out.write(bout);
                        }

---

and the server decrypting the file and putting it together on the server..

Code:

---

                    Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
                    cipher.init(Cipher.DECRYPT_MODE, secretKey);

                    // receive file
                    FileOutputStream fout = new FileOutputStream(file);
                   
                    byte[] buffer = new byte[8192];
                    byte[] bout = null;
                    int length;
                   
                    while (true) {
                        length = in.readInt();
                        if (length <= 0) break;
                        in.read(buffer, 0, length);
               
                        bout = cipher.update(buffer, 0, length);
                        fout.write(bout);
                    }

---

Everything works fine, except 1 problem. On the client side, say i want to send test.txt and test.txt contains this:

Code:

---

Hello there

whats up
 
Multi line test stuff!!

---

on the server side, the file ends up like this

Code:

---

Hello there

whats up
 
Multi line

---

on the last line, it should say: Multi line test stuff!!
anyone see what im doing wrong?

read() and write() with sockets are not guaranteed to return as much data as requested. Perhaps that's the problem?