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diff --git a/blog/sbs_2/cgi-src/cgiutils.hpp b/blog/sbs_2/cgi-src/cgiutils.hpp
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+++ b/blog/sbs_2/cgi-src/cgiutils.hpp
@@ -0,0 +1,245 @@
+/*
+ * Copyright 2017 Chris Xiong
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef CGILIB_HPP
+#define CGILIB_HPP
+#include <cstdlib>
+#include <map>
+#include <string>
+#include <vector>
+const char* base64_table="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
+std::string base64_encode(std::string s)
+{
+	std::string r="";
+	for(unsigned i=0;i<s.length();i+=3)
+	{
+		int b=(s[i]&0xFC)>>2;
+		r+=base64_table[b];
+		b=(s[i]&0x03)<<4;
+		if(i+1<s.length())
+		{
+			b|=(s[i+1]&0xF0)>>4;
+			r+=base64_table[b];
+			b=(s[i+1]&0x0F)<<2;
+			if(i+2<s.length())
+			{
+				b|=(s[i+2]&0xC0)>>6;
+				r+=base64_table[b];
+				b=s[i+2]&0x3F;
+				r+=base64_table[b];
+			}else r+=base64_table[b],r+='=';
+		}else r+=base64_table[b],r+="==";
+	}
+	return r;
+}
+void split(std::string s,char c,std::vector<std::string>& v)
+{
+	v.clear();
+	for(size_t anch=0;;)
+	{
+		std::string sec;
+		if(s.find(c,anch)==std::string::npos)
+		sec=s.substr(anch);
+		else sec=s.substr(anch,s.find(c,anch)-anch);
+		v.push_back(sec);
+		if(s.find(c,anch)==std::string::npos)break;
+		anch=s.find(c,anch)+1;
+	}
+}
+std::string trim(std::string s)
+{
+	int l=0;for(;isblank(s[l]);++l)
+	s=s.substr(l);
+	while(isblank(s.back()))s.pop_back();
+	return s;
+}
+class QueryStrParser
+{
+	private:
+		std::map<std::string,std::string> q;
+		void parse(std::string es)
+		{
+			for(size_t anch=0;;)
+			{
+				std::string sec;
+				if(es.find('&',anch)==std::string::npos)
+				sec=es.substr(anch);
+				else sec=es.substr(anch,es.find('&',anch)-anch);
+				if(sec.find('=')==std::string::npos)
+				q[sec.substr(0)]="";
+				else
+				q[sec.substr(0,sec.find('='))]=sec.substr(sec.find('=')+1);
+				if(es.find('&',anch)==std::string::npos)break;
+				anch=es.find('&',anch)+1;
+			}
+		}
+	public:
+		QueryStrParser()
+		{
+			char* e=getenv("QUERY_STRING");
+			if(!e)return;
+			parse(std::string(e));
+		}
+		QueryStrParser(std::string s)
+		{
+			parse(s);
+		}
+		bool exist(std::string s)
+		{
+			return q.find(s)!=q.end();
+		}
+		std::string value(std::string s)
+		{
+			if(!exist(s))return "";
+			return q.find(s)->second;
+		}
+};
+class RequestCookies
+{
+	private:
+		std::map<std::string,std::string> m;
+		void parse(std::string cookie)
+		{
+			std::vector<std::string> v;
+			split(cookie,';',v);
+		}
+	public:
+		RequestCookies()
+		{
+			char* e=getenv("HTTP_COOKIE");
+			if(!e)return;
+			parse(std::string(e));
+		}
+};
+class DOMAttrib
+{
+	private:
+		std::map<std::string,std::string> m;
+	public:
+		DOMAttrib(std::string s="")
+		{
+			for(size_t anch=0;;)
+			{
+				std::string sec;
+				if(s.find('"',anch)==std::string::npos)
+				sec=s.substr(anch);
+				else sec=s.substr(anch,s.find('"',s.find('"',anch)+1)-anch+1);
+				if(sec.find('=')==std::string::npos)
+				m[sec.substr(0)]="";
+				else
+				m[sec.substr(0,sec.find('='))]=sec.substr(sec.find('=')+2),
+				m[sec.substr(0,sec.find('='))].pop_back();
+				if(s.find(' ',anch+sec.length())==std::string::npos)break;
+				anch=s.find(' ',anch+sec.length())+1;
+			}
+		}
+		void setAttrib(std::string a,std::string v){m[a]=v;}
+		void eraseAttrib(std::string a){if(existAttrib(a))m.erase(m.find(a));}
+		bool existAttrib(std::string a){return m.find(a)!=m.end();}
+		std::string getAttrib(std::string a){if(!existAttrib(a))return "";return m[a];}
+		std::string to_string()
+		{
+			std::string r;bool cf=false;
+			for(auto i=m.begin();i!=m.end();++i)
+			{
+				if(cf)r+=' ';else cf=true;
+				r+=i->first+"=\""+i->second+"\"";
+			}
+			return r;
+		}
+};
+static const char* twoxx[]={
+	"OK",
+	"Created",
+	"Accepted",
+	"Non-Authoritative Information",
+	"No Content",
+	"Reset Content",
+	"Partial Content",
+	"Multi-Status",
+	"Already Reported"
+};
+static const char* threexx[]={
+	"Multiple Choices",
+	"Moved Permanently",
+	"Found",
+	"See Other",
+	"Not Modified",
+	"Use Proxy",
+	"???",
+	"Temporary Redirect"
+};
+static const char* fourxx[]={
+	"Bad Request",
+	"Unauthorized",
+	"Payment Required",
+	"Forbidden",
+	"Not Found",
+	"Method Not Allowed",
+	"Not Acceptable",
+	"Proxy Authentication Required",
+	"Request Timeout",
+	"Conflict",
+	"Gone",
+	"Length Required",
+	"Precondition Failed",
+	"Request Entity Too Large",
+	"Request-URI Too Long",
+	"Unsupported Media Type",
+	"Requested Range Not Satisfiable",
+	"Expectation Failed"
+};
+static const char* fivexx[]={
+	"Internal Server Error",
+	"Not Implemented",
+	"Bad Gateway",
+	"Service Unavailable",
+	"Gateway Timeout",
+	"HTTP Version Not Supported"
+};
+class HTTPHeader
+{
+private:
+	int status;
+	std::vector<std::string> hdr;
+public:
+	HTTPHeader(){status=200;}
+	void setStatusCode(int c){status=c;}
+	int statusCode(){return status;}
+	void appendHeader(std::string s){hdr.push_back(s);}
+	void print()
+	{
+		if(status>=200&&status<=208)
+		printf("Status: %d %s\r\n",status,twoxx[status-200]);
+		if(status>=300&&status<=307)
+		printf("Status: %d %s\r\n",status,threexx[status-300]);
+		if(status>=400&&status<=417)
+		printf("Status: %d %s\r\n",status,fourxx[status-400]);
+		if(status>=500&&status<=505)
+		printf("Status: %d %s\r\n",status,fivexx[status-500]);
+		for(unsigned i=0;i<hdr.size();++i)
+		printf("%s\r\n",hdr[i].c_str());
+		printf("\r\n");
+	}
+};
+#endif