/** web.h
  * 1.Declares a class to encode strings converting a String 
  * into a MIME format called "x-www-form-urlencoded" format. 
  *	To convert a String, each character is examined in turn: 
  *		1) The ASCII characters 'a' through 'z', 'A' through 'Z', and '0' through '9' remain the same. 
  * 	2) The space character ' ' is converted into a plus sign '+'. 
  *		3) All other characters are converted into the 3-character string "%xy", where xy is the two-digit hexadecimal representation of the lower 8-bits of the character. 
  * 2.Declares a class to decode such strings
  * 3. Declares the WebForm class to wrap win32 HTTP calls
  * Author: Vijay Mathew Pandyalakal
  * Date: 18/10/03
**/

#ifndef WEB_H_
#define WEB_H_

namespace openutils {

class URLEncoder {
public:
	static string encode(string str);
private:
	static bool isOrdinaryChar(char c);
};

class URLDecoder {
public:
	static string decode(string str);
private:
	static int convertToDec(const char* hex);
	static void getAsDec(char* hex);
};

class WebForm {
private:
	vector<string> m_vctVars;
	vector<string> m_vctVals;	
	string m_strHostName;
	string m_strScriptFile;
	HINTERNET m_hSession;	
	HINTERNET m_hRequest;
	unsigned long m_lBytesRead;

public:
	WebForm();
	void putVariable(const char* var_name,const char* value);
	string getVariable(const char* var_name) const;
	void setHost(const char* host);
	void setScriptFile(const char* sf);
	string getHost() const;
	string getScriptFile() const;
	void sendRequest();
	bool getResponse(char* buff,int sz);
	unsigned long getBytesRead() { return m_lBytesRead; }
	~WebForm();
private:
	bool isDuplicateVar(const char* var_name);
};

class WebFormException {
private:
	string err;
public:
	WebFormException(const char* str) {
		err = str;
	}
	string getMessage() {
		return err;
	}
};
} // openutils

#endif