/**********************************************************************
 *
 * netio.h
 * Copyright (C) 1996
 * 
 * A component of the fnord webserver written by bmorin@wpi.edu.
 *
 * Altered for use with the Greenstone digital library software by the
 * New Zealand Digital Library Project at the University of Waikato,
 * New Zealand.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *********************************************************************/

#include "text_t.h"

/*
Module Name: Net IO
Purpose: High level Socket IO and Misc socket routines
Public Functions:
	InitNetIO
   CleanUpNetIO

	GetLocalIP
	GetLocalName

   CreateListeningSocket
   AnswerListeningSocket
   DestroyListeningSocket

   CloseSocket

	GetData
	GetLine

	SendData
	SendFile
*/

//Public Functions

/*
Function Name: Init Net IO
Purpose: Initializes the module so calls can be made querying network
         information for the local macnine.
Notes: MUST be called before GetLocalIP and GetLocalName
*/

// returns 0 on success,
// WSASYSNOTREADY, WSAVERNOTSUPPORTED, or WSAEINVAL on failure
int InitNetIO();

/*
Function Name: Cleanup Net IO
Purpose: Cleans up the module and unloads Winsock
*/
void CleanUpNetIO();

/*
Function Name: Reset Net IO
Purpose: Resets internal data in NetIO to reflect registry changes, etc.
*/
void ResetNetIO();

/*
Function Name: Get Local IP
Purpose: Gets the local IP number
Returns: The local IP number as an double word (4 bytes)
*/
DWORD GetLocalIP();

/*
Function Name: Get Local Name
Purpose: Gets the local Domain name, or if there is none, then the server
address in dotted format.
Returns: A string containing the local address
*/
char *GetLocalName(HINSTANCE hInstance);

// returns 0 on success, and a WSA error message on failure.
// possible error messages include:
// WSANOTINITIALISED, WSAENETDOWN, WSAEAFNOSUPPORT, WSAEINPROGRESS, WSAEMFILE,
// WSAENOBUFS, WSAEPROTONOSUPPORT, WSAEPROTOTYPE, WSAESOCKTNOSUPPORT,
// WSAEADDRINUSE, WSAEINVAL, WSAEISCONN, WSAENOTSOCK, WSAEOPNOTSUPP
int CreateListeningSocket(int &PortNum, HWND MsgWindow, 
			  WORD SocketMsg, SOCKET &ServerSocket);

int AnswerListeningSocket(SOCKET ServerSocket, SOCKET &ClientSocket, 
			  SOCKADDR_IN &ClientSockAddr, int AddrLen);

void DestroyListeningSocket(SOCKET &ServerSocket, HWND MsgWindow);

void CloseSocket(SOCKET &TargetSocket);

/*
Function Name: Get Data
Purpose: Gets data from a socket with muli-threaded debugging
Parameters:
	ClientSocket - The socket to get data from
	IOBuffer - A pointer to a chunk of memory to put data in
	IOBufferSize - Size of the buffer
	ThreadNum - Number of the thread that called this functions used for debugging

Returns: -1 on error, else the number of bytes received

Notes:
Removed socket error checking because I was unable to isolate what
errors I was getting when getting a "rude" disconnect
*/
int GetData(SOCKET ClientSocket, BYTE *IOBuffer, int IOBufferSize, int ThreadNum);

/*
Function Name: Get Line
Purpose: Gets a line of text (ended by a LF (10)) from a socket with buffered
			input.  If the buffer is empty this function fills the buffer, else it
			just changes an index. Also has the ability to do multi-threaded debuging
Parameters:
	OutStr - Varible were output is put
	ClientSocket - The socket to get data from
	IOBuffer - A pointer to a chunk of memory to put data in
	IOBufferSize - Size of the buffer
	BufferIndex - A zero based index of what charactor in the buffer we're at
	DataInBuffer - Amount of data in the buffer
	ThreadNum - Number of the thread that called this functions used for debugging

Returns: -1 on disconnect or error (abort connection), 0 on success
*/
int GetLine(text_t &OutStr, SOCKET ClientSocket, BYTE *IOBuffer, int IOBufferSize, 
	    int &BufferIndex, int &DataInBuffer, int ThreadNum);

/*
Function Name: Send Data
Purpose: Sends data to a socket with muli-thread debugging
Parameters:
	ClientSocket - The socket to get data from
	SendBuffer - A pointer to a chunk of memory to put data in
	NumToSend - Number of bytes to send from buffer
	ThreadNum - Number of the thread that called this functions used for debugging

Returns: -1 on error, 0 on success

Notes:
Removed socket error checking because I was unable to isolate what
errors I was getting when getting a "rude" disconnect
*/
int SendData(SOCKET ClientSocket, BYTE *SendBuffer, 
	     int NumToSend, int ThreadNum);