{\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fprq6 Arial;}} {\colortbl ;\red0\green0\blue255;} {\*\generator Msftedit 5.41.21.2507;}\viewkind4\uc1\pard\tx720\tx1440\tx2160\cf1\f0\fs44\par } {\rtf1\ansi\ansicpg1252\deff0\deflang1033{\fonttbl{\f0\fnil\fprq8 Arial;}} {\colortbl ;\red0\green0\blue255;} {\*\generator Msftedit 5.41.21.2507;}\viewkind4\uc1\pard\tx720\tx1440\tx2160\cf1\f0\fs44\par } {\rtf1\ansi\ansicpg1252\deff0\deflang1033\deflangfe1033{\fonttbl{\f0\fswiss\fprq2\fcharset0 Arial;}{\f1\fmodern\fprq1\fcharset0 Courier New;}} {\stylesheet{ Normal;}{\s1 heading 1;}} {\*\generator Msftedit 5.41.21.2507;}\viewkind4\uc1\pard\keepn\s1\sb240\sa60\kerning32\b\f0\fs32 File protocol.h\par \pard\kerning0\b0\f1\fs20\par #define MAX_PKT 1024;\par \par typedef enum \{false, true\} boolean;\par typedef unsigned int seq_nr;\par typedef struct \{unsined char data[MAX_PKT] \} packet;\par typedef enum \{data, ack, nak\} frame_kind;\par \par typedef struct\par \{\tab frame_kind kind;\par \tab\lang1031 seq_nr seq;\par \tab\lang1033 seq_nr ack;\par \tab packet info;\par \} frame;\par \par void wait_for_event(event_type *event);\par void from_network_layer(packet *p);\par void to_network_layer(packet *p);\par void from_physical_layer(frame *r);\par void to_physical_layer(frame *s);\par void start_timer(seq_nr k);\par void stop_timer(seq_nr k);\par void start_ack_timer(void);\par void stop_ack_timer(void);\par void enable_network_layer(void);\par void disable_network_layer(void);\par #define inc(k) if (k < MAX_SEQ) k = k + 1; else k = 0;\par } 2590319262{\rtf1\ansi\ansicpg1252\deff0\deflang1033\deflangfe1033{\fonttbl{\f0\fswiss\fprq2\fcharset0 Arial;}{\f1\fmodern\fprq1\fcharset0 Courier New;}} {\stylesheet{ Normal;}{\s1 heading 1;}{\s2 heading 2;}{\s3 heading 3;}} {\*\generator Msftedit 5.41.21.2507;}\viewkind4\uc1\pard\keepn\s3\sb240\sa60\b\f0\fs26 Unrestricted Simplex Protocol: Sending\par \pard\b0\f1\fs20 typedef enum \{frame_arrival\} event_type;\par #include \ldblquote protocol.h\rdblquote\par \par void sender(void)\par \{\tab frame s;\par \tab packet buffer;\par \tab while (true)\par \tab\{\tab from_network_layer(&buffer);\par \tab\tab s.info = buffer;\par \tab\tab to_physical_layer(&s);\par \tab\}\par \}\par \pard\keepn\s3\sb240\sa60\b\f0\fs26 Unrestricted Simplex Protocol: Receiving\par \pard\b0\f1\fs20 typedef enum \{frame_arrival\} event_type;\par #include \ldblquote protocol.h\rdblquote\par \par void receiver(void)\par \{\tab frame r;\par \tab event_type event;\par \tab while (true)\par \tab\{\tab wait_for_event(&event);\par \tab\tab from_physical_layer(&r);\par \tab\tab to_network_layer(&r.info);\par \tab\}\par \}\par } 2524120876{\rtf1\ansi\ansicpg1252\deff0\deflang1033\deflangfe1033{\fonttbl{\f0\fswiss\fprq2\fcharset0 Arial;}{\f1\fmodern\fprq1\fcharset0 Courier New;}} {\stylesheet{ Normal;}{\s1 heading 1;}{\s2 heading 2;}{\s3 heading 3;}} {\*\generator Msftedit 5.41.21.2507;}\viewkind4\uc1\pard\keepn\s3\sb240\sa60\b\f0\fs26 Stop and Wait Protocol: Sending\par \pard\f1\fs28 typedef \{frame_arrival\} event_type;\par #include \ldblquote protocol.h\rdblquote\par \par void sender(void)\par \{\tab frame s;\par \tab packet buffer;\par \tab event_type event;\par \tab while (true)\par \tab\{\tab from_network_layer(&buffer);\par \tab\tab s.info = buffer;\par \tab\tab to_physical_layer(&s);\par \tab\tab wait_for_event(&event);\par \tab\}\par \}\b0\fs20\par \pard\keepn\s3\sb240\sa60\b\f0\fs26 Stop and Wait Protocol: Receiving\par \pard\f1\fs28 void receiver(void)\par \{\tab frame r, s;\par \tab event_type event;\par \tab while (true)\par \tab\{\tab wait_for_event(&event);\par \tab\tab from_physical_layer(&r);\par \tab\tab to_network_layer(&r.info);\par \tab\tab to_physical_layer(&s);\par \tab\}\par \}\par } 2452720532{\rtf1\ansi\ansicpg1252\deff0\deflang1033\deflangfe1033{\fonttbl{\f0\fswiss\fprq2\fcharset0 Arial;}{\f1\fmodern\fprq1\fcharset0 Courier New;}} {\stylesheet{ Normal;}{\s1 heading 1;}{\s2 heading 2;}{\s3 heading 3;}} {\*\generator Msftedit 5.41.21.2507;}\viewkind4\uc1\pard\keepn\s3\sb240\sa60\b\f0\fs26 Positive Acknowledgement with retransmission: Sending\par \pard\b0\fs24\par \f1\fs20 #define MAX_SEQ 1;\par typedef enum \{frame_arrival, chsum_err, timeout\} event_type;\par #include \ldblquote protocol.h\rdblquote\par \par void sender(void)\par \{\par \tab seq_nr next_frame_to_send;\par \tab frame s;\par \tab packet buffer;\par \tab event_type event;\par \par \tab next_frame_to_send = 0;\par \tab from_network_layer(&buffer);\par \tab while (true)\par \tab\{\par \tab\tab s.info = buffer;\par \tab\tab s.seq = next_frame_to_send;\par \tab\tab to_physical_layer(&s);\par \tab\tab start_timer(s.seq);\par \tab\tab wait_for_event(&event);\par \tab\tab if (event == frame_arrival)\par \tab\tab\{\par \tab\tab\tab from_physical_layer(&s);\par \tab\tab\tab if (s.ack == next_frame_to_send)\par \tab\tab\tab\{\par \tab\tab\tab\tab from_network_layer(&buffer);\par \tab\tab\tab\tab inc(next_frame_to_send);\par \tab\tab\tab\}\par \tab\tab\}\par \tab\}\par \}\par } 2698816457{\rtf1\ansi\ansicpg1252\deff0\deflang1033\deflangfe1033{\fonttbl{\f0\fswiss\fprq2\fcharset0 Arial;}{\f1\fmodern\fprq1\fcharset0 Courier New;}} {\stylesheet{ Normal;}{\s1 heading 1;}{\s2 heading 2;}{\s3 heading 3;}} {\*\generator Msftedit 5.41.21.2507;}\viewkind4\uc1\pard\keepn\s3\sb240\sa60\b\f0\fs26 Positive Acknowledgement with retransmission: Receiving\par \pard\b0\f1\fs20\par \par \b\fs24 void receiver(void)\par \{\par \tab seq_nr frame_expected;\par \tab frame r, s;\par \tab event_type event;\par \par \tab frame_expected = 0;\par \tab while (true)\par \tab\{\par \tab\tab wait_for_event(&event);\par \tab\tab if (event == frame_arrival)\par \tab\tab\{\par \tab\tab\tab from_physical_layer(&r);\par \tab\tab\tab if (r.seq == frame_expected)\par \tab\tab\tab\{\par \tab\tab\tab\tab to_network_layer(&r.info);\par \tab\tab\tab\tab inc(frame_expected);\par \tab\tab\tab\}\par \tab\tab\tab s.ack = 1 \endash frame_expected;\par \tab\tab\tab to_physical_layer(&s);\par \tab\tab\}\par \tab\}\par \}\b0\fs20\par } 2370719844{\rtf1\ansi\ansicpg1252\deff0\deflang1033\deflangfe1033{\fonttbl{\f0\froman\fprq2\fcharset0 Times New Roman;}{\f1\fmodern\fprq1\fcharset0 Courier New;}} {\*\generator Msftedit 5.41.21.2507;}\viewkind4\uc1\pard\f0\fs24 Protocol 4 (Sliding Window) is bidirectional, so only one function is needed:\par \par \pard\tx360\tx720\tx1080\tx1440\tx1800\tx2160\b\f1\fs18 #define MAX_SEQ 1\par typedef enum \{frame_arrival, chksum_err, timeout\} event_type;\par #include \ldblquote protocol.h\rdblquote\par \par void slidingWindow(void)\par \{\par \b0\i\tab // Defining variables needed\par \b\i0\tab seq_nr next_frame_to_send = 0;\par \tab seq_nr frame_expected = 0;\par \tab frame r, s;\par \tab packet buffer;\par \tab event_type event;\par \par \b0\i\tab // Getting info from network layer and defining first sending frame\par \b\i0\tab from_network_layer(&buffer);\par \tab s.info = buffer;\par \tab s.seq = next_frame_to_send;\par \tab s.ack = 1 \endash frame_expected;\par \tab\par \b0\i\tab // sending out the frame and starting the timer\par \b\i0\tab to_physical_layer(s);\par \tab start_time(s.seq);\par \par \tab while (true)\par \tab\{\tab\b0\i // waiting for event. Chksum_err or timeout events are ignored\par \b\i0\tab\tab wait_for_event(&event);\par \tab\tab if (event == frame_arrival)\par \tab\tab\{\tab\b0\i // an undamaged frame arrived, so get it into r\par \b\i0\tab\tab\tab from_physical_layer(&r);\par \par \tab\tab\tab if (r.seq == frame_expected)\par \tab\tab\tab\{\tab\b0\i // handle inbound frame stream, i.e. give info to network layer\par \b\i0\tab\tab\tab\tab to_network_layer(&r.info);\par \tab\tab\tab\tab inc(frame_expected);\par \tab\tab\tab\}\par \tab\tab\tab if (r.ack == next_frame_to_send)\par \tab\tab\tab\{\tab\b0\i // handle outbound frame stream, i.e. fetch new packet\par \b\i0\tab\tab\tab\tab from_network_layer(&buffer);\tab\par \tab\tab\tab\tab inc(next_frame_to_send);\par \tab\tab\tab\}\par \tab\tab\}\par \b0\i\tab\tab // construct outgoing frame\par \b\i0\tab\tab s.info = buffer;\par \tab\tab s.seq = next_frame_to_send;\par \tab\tab s.ack = 1 \endash frame_expected;\par \b0\i\tab\tab // send outgoing frame and start timer\par \b\i0\tab\tab to_physical_layer(&s);\par \tab\tab start_timer(s.seq);\par \tab\}\par \}\par } 2674921325