#include

#include

using namespace std;

void text$2$bin$\_$IPv$6($const char$*$ a$,$ unsigned char$*$ v$)$

$\{$

$//$ a$[]$ is the text format representation of the IPv$6$ address.

$//$ v$[]$ is the binary IPv$6$ address to be produced by the conversion function.

$//$ v$[0]$ is the leftmost byte of the $128-$bit IPv$6$ address,

$//$ bit$-7$ of v$[0]$ is the leftmost $(1$st$)$ bit of the IPv$6$ address.

for $($int k $=0$; k $<16$; k$++)$

v$[$k$]=0$;

$//$ Your codes. You may define additional supporting function where

appropriate.

$//$ This exercise is intended to train your organization skills.

$//$ Length of this function is longer than the previous tutorials.

$//$ Expected number of statements is about $45$ to $50.$

$\}$

$//---------------------------------------$ functions given to students

char toHex$($unsigned d$)$

$\{$

if $($d $>=10)$

return d $-10+\text{'}$a$\text{'}$;

return d $+\text{'}0\text{'}$;

$\}$

void printIPv$6$address$\_$hex$($const unsigned char$*$ v$)$

$\{$

cout $<<$ "IPv$6$ address $($hex$)"$;

for $($int i $=0$; i $<16$; i$++)$

$\{$

cout $<<$ toHex$($v$[$i$]/16)<<$ toHex$($v$[$i$]\%16)$;

if $($i $\%2$ && i $<14)$

cout $<<\text{'}$:$\text{'}$;

$\}$

cout $<<$ endl;

$\}$

void printIPv$6$address$\_$bin$($const unsigned char$*$ v$)$

$\{$

cout $<<$ "IPv$6$ address $($bin$)"$;

for $($int i $=0$; i $<16$; i$++)$

$\{$

cout $<<$ bitset$<8>($v$[$i$])$;

if $($i $\%2$ && i $<14)$

cout $<<"-"$;

$\}$

cout $<<$ endl;

$\}$

void test$($const char$*$ a$)$

$\{$

cout $<<"-----------------------------------------------------------$

$"$;

cout $<<$ "IPv$6$ address $($text$)"<<$ a $<<$ endl;

unsigned char v$[16]$; $//16$ bytes memory to store the $128-$bit IPv$6$ address

text$2$bin$\_$IPv$6($a$,$ v$)$;

printIPv$6$address$\_$hex$($v$)$;

printIPv$6$address$\_$bin$($v$)$;

$\}$

int main$()$

$\{$

$//$ Test data : IPv$6$ addresses in text format

char a$1[]="$::$"$;

char a$2[]="$::$1"$;

char a$3[]="1234$:abc:$0$:$78$:ff$00$:$0$:$30$:$5"$;

char a$4[]="2001$:db$8$:a$3$::$200$:$8"$;

char a$5[]="2001$:db$8$::$"$;

char a$6[]="$::$101$:$7000$:$3$:$0$:$4"$;

test$($a$1)$;

test$($a$2)$;

test$($a$3)$;

test$($a$4)$;

test$($a$5)$;

test$($a$6)$;

system$("$pause$")$;

return $0$;

$\}$