From 009cf6dc661422ddc2e582b0a06c55aabcc5a986 Mon Sep 17 00:00:00 2001
From: Geno <genofire@users.noreply.github.com>
Date: Wed, 8 Jul 2015 02:14:53 +0200
Subject: [PATCH] Create index.js

---
 index.js | 180 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 180 insertions(+)
 create mode 100644 index.js

diff --git a/index.js b/index.js
new file mode 100644
index 0000000..04894ac
--- /dev/null
+++ b/index.js
@@ -0,0 +1,180 @@
+function hex2dec(val){
+  return parseInt("0x"+val);
+}
+
+function dec2hex(val){
+  var str="";
+  var minus=false;
+  if(val<0){minus=true;val*=-1;}
+  val=Math.floor(val);
+  while(val>0){
+    var v=val%16;
+    val/=16;val=Math.floor(val);
+    switch(v){
+      case 10:v="a";break;
+      case 11:v="b";break;
+      case 12:v="c";break;
+      case 13:v="d";break;
+      case 14:v="e";break;
+      case 15:v="f";break;
+    }
+    str=v + str;
+  }
+  if(str=="")str="0";
+  if(minus)str="-"+str;
+  return str;
+}
+
+function dec2hexlen(val,minlen){
+  var str=dec2hex(val);
+  while(str.length<minlen)str="0"+str;
+  return str;
+}
+
+function ip6null(){
+  var ar=new Array;
+  for(var i=0;i<8;i++)ar[i]=0;
+  return ar;
+}
+function parseIp6(str){
+  var ar=new Array;
+  for(var i=0;i<8;i++)ar[i]=0;
+  if(str=="::")return ar;
+  var sar=str.split(':');
+  var slen=sar.length;
+  if(slen>8)slen=8;
+  var j=0;
+  for(var i=0;i<slen;i++){
+    if(i && sar[i]==""){j=9-slen+i;continue;}
+    ar[j]=parseInt("0x0"+sar[i]);
+    j++;
+  }
+
+  return ar;
+}
+
+function ip6toString(ar){
+  var str="";
+  var zs=-1,zsf=-1;
+  var zl=0,zlf=0;
+  var md=0;
+  for(var i=0;i<8;i++){
+    if(md){
+      if(ar[i]==0)zl++;
+      else md=0;
+    }else{
+      if(ar[i]==0){zs=i;zl=1;md=1;}
+    }
+    if(zl>2 && zl>zlf){zlf=zl;zsf=zs;}
+  }
+  for(var i=0;i<8;i++){
+    if(i==zsf){
+      str+=":";
+      i+=zlf-1;
+      if(i>=7)str+=":";
+      continue;
+    }
+    if(i)str+=":";
+    str+=dec2hex(ar[i]);
+  }
+  return str;
+}
+function ip6prefixToMask(prf){
+  var ar=new Array;
+  for(var i=0;i<8;i++){
+    if(prf>=16)ar[i]=0xffff;
+    else switch(prf){
+      case 1:ar[i]=0x8000;break;
+      case 2:ar[i]=0xc000;break;
+      case 3:ar[i]=0xe000;break;
+      case 4:ar[i]=0xf000;break;
+      case 5:ar[i]=0xf800;break;
+      case 6:ar[i]=0xfc00;break;
+      case 7:ar[i]=0xfe00;break;
+      case 8:ar[i]=0xff00;break;
+      case 9:ar[i]=0xff80;break;
+      case 10:ar[i]=0xffc0;break;
+      case 11:ar[i]=0xffe0;break;
+      case 12:ar[i]=0xfff0;break;
+      case 13:ar[i]=0xfff8;break;
+      case 14:ar[i]=0xfffc;break;
+      case 15:ar[i]=0xfffe;break;
+      default:ar[i]=0;break;
+    }
+    prf-=16;
+  }
+  return ar;
+}
+function ip6mask(ip,prf){
+  if(typeof(prf)=="number")prf=ip6prefixToMask(prf);
+  var ip2=new Array;
+  for(var i=0;i<8;i++)ip2[i] = ip[i] & prf[i];
+  return ip2;
+}
+
+function ip6maskHost(ip,prf){
+  if(typeof(prf)=="number")prf=ip6prefixToMask(prf);
+  else prf=ip6copy(prf);
+  for(var i=0;i<8;i++)prf[i]=(~prf[i])&0xffff;
+  var ip2=new Array;
+  for(var i=0;i<8;i++)ip2[i] = ip[i] & prf[i];
+  return ip2;
+}
+function ip6copy(ip){
+  var r=new Array;
+  for(var i=0;i<8;i++)r[i]=ip[i];
+  return r;
+}
+function ip6merge(net,host,prefix){
+  net=ip6mask(net,prefix);
+  host=ip6maskHost(host,prefix);
+  for(var i=0;i<8;i++)net[i] |= host[i];
+  return net;
+}
+function extractmac(ip6,strsplit){
+  if((ip6[5]&0xff)!=0xff || (ip6[6]>>8)!=0xfe)return;
+  var mac=dec2hexlen((ip6[4]>>8)^2,2)+strsplit;
+  mac+=dec2hexlen(ip6[4]&0xff,2)+strsplit;
+  mac+=dec2hexlen(ip6[5]>>8,2)+strsplit;
+  mac+=dec2hexlen(ip6[6]&0xff,2)+strsplit;
+  mac+=dec2hexlen(ip6[7]>>8,2)+strsplit;
+  mac+=dec2hexlen(ip6[7]&0xff,2);
+  return mac;
+}
+function mactoeui(value){
+  var mac=value.replace(/:/g,"-").split("-");
+  if(mac.length!=6){return;}
+  var ip6=ip6null();
+  ip6[4]=hex2dec(mac[0])<<8 | hex2dec(mac[1]);
+  ip6[4] ^= 0x200;
+  ip6[5]=hex2dec(mac[2])<<8 | 0xff;
+  ip6[6]=hex2dec(mac[3]) | 0xfe00;
+  ip6[7]=hex2dec(mac[4])<<8 | hex2dec(mac[5]);
+  return ip6toString(ip6);
+}
+function _toMAC(value,strsplit){
+  if(!strsplit)
+    strsplit = ':';
+  return extractmac(parseIp6(value),strsplit);
+}
+function _toIPv6(prefix,mac,prf){
+  if(!mac)
+    return mactoeui(prefix);
+  else{
+    if(!prf)
+      prf=64;
+    return ip6toString(ip6merge(parseIp6(prefix),parseIp6(mactoeui(mac)),parseInt(prf)));
+  }
+}
+function _fromIPv6(ip6,prf){
+  if(!prf)
+    prf=64;
+  ip=parseIp6(ip6);
+  prf =parseInt(prf);
+  return {
+    net:ip6toString(ip6mask(ip,prf)),
+    host:ip6toString(ip6maskHost(ip,prf)),
+    mac:_toMAC(ip6)
+  }
+}
+module.exports = {toMAC:_toMAC,toIPv6:_toIPv6,fromIPv6:_fromIPv6};