예제 #1
0
HTTP_IO_RESULT HTTPExecuteRoute(void)
{
	BYTE *queryStringPos;
	BYTE *ext;
	CHAR filename[128];

	switch(activeRequest.methodState)
	{
		case ROUTE_PROCESS_REQUEST:
			// We need to determine if this is a route that requires dynamic body 
			// generation or if this is just a static asset that we need to serve up
			queryStringPos = strchr(activeRequest.url, '?');
			ext = strchr(activeRequest.url, '.');

			// There is a period that must be a file extension because there is
			// no query string that might contain periods in the data.  This is
			// a simple indicator of a static asset.
			if(ext != NULL && queryStringPos == NULL)
			{
				activeRequest.routeType = ROUTE_STATIC;

	      // Make sure the file exists
  			// Add the root dir to the file
				sprintf(filename, "public%s", activeRequest.url);
	      activeConnection.file = FATFS_fopen(filename, "r");
	      if(activeConnection.file == NULL)
	      {
	      	mLED_Red_Toggle();
	      	activeResponse.status = HTTP_NOT_FOUND;
	      }
	          
	      // Find the extension in the filename
	      ext++;
	      for(activeResponse.returnType = HTTP_TXT; activeResponse.returnType < HTTP_UNKNOWN; activeResponse.returnType++)
	       if(!stricmppgm2ram(ext, (ROM void*)httpFileExtensions[activeResponse.returnType]))
	         break;

	      activeResponse.disableCache = FALSE;
			}
			else
			{
				activeRequest.routeType = ROUTE_DYNAMIC;
				activeResponse.disableCache = TRUE;
			}

			activeRequest.methodState = ROUTE_SERVE_HEADERS;
			return HTTP_IO_WAITING;
			break;

		case ROUTE_SERVE_HEADERS:
			// We're in write mode now:
      // Adjust the TCP FIFOs for optimal transmission of 
      // the HTTP response to the browser
      TCPAdjustFIFOSize(activeSocket, 1, 0, TCP_ADJUST_GIVE_REST_TO_TX);
        
      // Send headers
      TCPPutROMString(activeSocket, (ROM BYTE*)HTTPResponseHeaders[activeResponse.status]);

      // If this is a redirect, print the rest of the Location: header         
      if(activeResponse.status == HTTP_REDIRECT)
      {
        TCPPutString(activeSocket, activeConnection.data);
        TCPPutROMString(activeSocket, (ROM BYTE*)"\r\n\r\n304 Redirect: ");
        TCPPutString(activeSocket, activeConnection.data);
        TCPPutROMString(activeSocket, (ROM BYTE*)HTTP_CRLF);
      }

      // Output the content type, if known
      if(activeResponse.returnType != HTTP_UNKNOWN)
      {
        TCPPutROMString(activeSocket, (ROM BYTE*)"Content-Type: ");
        TCPPutROMString(activeSocket, (ROM BYTE*)httpContentTypes[activeResponse.returnType]);
        TCPPutROMString(activeSocket, HTTP_CRLF);
      }
            
      // Output the cache-control
      if(activeResponse.status == HTTP_OK)
      {
	      TCPPutROMString(activeSocket, (ROM BYTE*)"Cache-Control: ");
	      if(activeRequest.method == HTTP_POST || activeResponse.disableCache == TRUE)
	      {// This is a dynamic page or a POST request, so no cache
	        TCPPutROMString(activeSocket, (ROM BYTE*)"no-cache");
	      }
	      else
	      {// This is a static page, so save it for the specified amount of time
	        TCPPutROMString(activeSocket, (ROM BYTE*)"max-age=");
	        TCPPutROMString(activeSocket, (ROM BYTE*)HTTP_CACHE_LEN);
	      }
	      TCPPutROMString(activeSocket, HTTP_CRLF);
	      
	      // Terminate the headers
	      TCPPutROMString(activeSocket, HTTP_CRLF);
    	}

      TCPFlush(activeSocket);

      // Only move on if we haven't encountered an error
      if(activeResponse.status == HTTP_OK)
      	activeRequest.methodState = ROUTE_SERVE_BODY;
      else
      	activeRequest.methodState = ROUTE_DONE;
  
      // Move to next stage
      return HTTP_IO_WAITING;
      break;

		case ROUTE_SERVE_BODY:
			// Two options here.  We either serving static file content or dynamically
			// building up a response specific to the route requested

			if(activeRequest.routeType == ROUTE_STATIC)
			{
				while(TCPIsPutReady(activeSocket) != 0)
				{
					if(HTTPServeStaticAsset())
					{
						activeRequest.methodState = ROUTE_DONE;
						return HTTP_IO_WAITING;
					}
				}
			}
			else
			{
				// This is a dynamic route and we need to decide what to do
				activeRequest.methodState = ROUTE_DONE;
			}


			return HTTP_IO_WAITING;
			break;

		case ROUTE_DONE:
			return HTTP_IO_DONE;
			break;

	} 
}
예제 #2
0
파일: HTTP2.c 프로젝트: sercankuslu/mgrs
/*********************************************************************
 * Function:        static void HTTPProcess(void)
 *
 * PreCondition:    HTTPInit() called and curHTTP loaded
 *
 * Input:           None
 *
 * Output:          None
 *
 * Side Effects:    None
 *
 * Overview:		Serves the current HTTP connection in curHTTP
 *
 * Note:            None
 ********************************************************************/
static void HTTPProcess(void)
{
    WORD lenA, lenB;
	BYTE c, i;
    BOOL isDone;
	BYTE *ext;
	BYTE buffer[HTTP_MAX_HEADER_LEN+1];

    do
    {
        isDone = TRUE;

        // If a socket is disconnected at any time 
        // forget about it and return to idle state.
        if(TCPWasReset(sktHTTP))
        {
            smHTTP = SM_HTTP_IDLE;

			// Make sure any opened files are closed
			if(curHTTP.file != MPFS_INVALID_HANDLE)
			{
				MPFSClose(curHTTP.file);
				curHTTP.file = MPFS_INVALID_HANDLE;
			}
			if(curHTTP.offsets != MPFS_INVALID_HANDLE)
			{
				MPFSClose(curHTTP.offsets);
				curHTTP.offsets = MPFS_INVALID_HANDLE;
			}

			// Adjust the TCP FIFOs for optimal reception of 
			// the next HTTP request from the browser
			TCPAdjustFIFOSize(sktHTTP, 1, 0, TCP_ADJUST_GIVE_REST_TO_RX | TCP_ADJUST_PRESERVE_RX);
        }


        switch(smHTTP)
        {

        case SM_HTTP_IDLE:

			// Check how much data is waiting
			lenA = TCPIsGetReady(sktHTTP);

			// If a connection has been made, then process the request
            if(lenA)
            {// Clear out state info and move to next state
				curHTTP.ptrData = curHTTP.data;
				smHTTP = SM_HTTP_PARSE_REQUEST;
				curHTTP.isAuthorized = 0xff;
				curHTTP.hasArgs = FALSE;
				curHTTP.callbackID = TickGet() + HTTP_TIMEOUT*TICK_SECOND;
				curHTTP.callbackPos = 0xffffffff;
				curHTTP.byteCount = 0;
			}
			
			// In all cases, we break
			// For new connections, this waits for the buffer to fill
			break;

		case SM_HTTP_PARSE_REQUEST:

			// Verify the entire first line is in the FIFO
			if(TCPFind(sktHTTP, '\n', 0, FALSE) == 0xffff)
			{// First line isn't here yet
				if(TCPGetRxFIFOFree(sktHTTP) == 0)
				{// If the FIFO is full, we overflowed
					curHTTP.httpStatus = HTTP_OVERFLOW;
					smHTTP = SM_HTTP_SERVE_HEADERS;
					isDone = FALSE;
				}
				if(TickGet() > curHTTP.callbackID)
				{// A timeout has occurred
					TCPDisconnect(sktHTTP);
					smHTTP = SM_HTTP_DISCONNECT;
					isDone = FALSE;
				}
				break;
			}

			// Reset the watchdog timer
			curHTTP.callbackID = TickGet() + HTTP_TIMEOUT*TICK_SECOND;

			// Determine the request method
			lenA = TCPFind(sktHTTP, ' ', 0, FALSE);
			if(lenA > 5)
				lenA = 5;
			TCPGetArray(sktHTTP, curHTTP.data, lenA+1);

		    if ( memcmppgm2ram(curHTTP.data, (ROM void*)"GET", 3) == 0)
			    curHTTP.httpStatus = HTTP_GET;
			#if defined(HTTP_USE_POST)
		    else if ( memcmppgm2ram(curHTTP.data, (ROM void*)"POST", 4) == 0)
			    curHTTP.httpStatus = HTTP_POST;
			#endif
		    else
			{// Unrecognized method, so return not implemented
		        curHTTP.httpStatus = HTTP_NOT_IMPLEMENTED;
				smHTTP = SM_HTTP_SERVE_HEADERS;
				isDone = FALSE;
				break;
			}

			// Find end of filename
			lenA = TCPFind(sktHTTP, ' ', 0, FALSE);
			lenB = TCPFindEx(sktHTTP, '?', 0, lenA, FALSE);
			lenA = mMIN(lenA, lenB);
			
			// If the file name is too long, then reject the request
			if(lenA > HTTP_MAX_DATA_LEN - HTTP_DEFAULT_LEN - 1)
			{
				curHTTP.httpStatus = HTTP_OVERFLOW;
				smHTTP = SM_HTTP_SERVE_HEADERS;
				isDone = FALSE;
				break;
			}

			// Read in the filename and decode
			lenB = TCPGetArray(sktHTTP, curHTTP.data, lenA);
			curHTTP.data[lenB] = '\0';
			HTTPURLDecode(curHTTP.data);
			
			// Check if this is an MPFS Upload
			#if defined(HTTP_MPFS_UPLOAD)
			if(memcmppgm2ram(&curHTTP.data[1], HTTP_MPFS_UPLOAD, strlenpgm(HTTP_MPFS_UPLOAD)) == 0)
			{// Read remainder of line, and bypass all file opening, etc.
				#if defined(HTTP_USE_AUTHENTICATION)
				curHTTP.isAuthorized = HTTPAuthenticate(NULL, NULL, &curHTTP.data[1]);
				#endif
				if(curHTTP.httpStatus == HTTP_GET)
					curHTTP.httpStatus = HTTP_MPFS_FORM;
				else
					curHTTP.httpStatus = HTTP_MPFS_UP;

				smHTTP = SM_HTTP_PARSE_HEADERS;
				isDone = FALSE;
				break;
			}
			#endif
			
			// If the last character is a not a directory delimiter, then try to open the file
			// String starts at 2nd character, because the first is always a '/'
			if(curHTTP.data[lenB-1] != '/')
				curHTTP.file = MPFSOpen(&curHTTP.data[1]);
				
			// If the open fails, then add our default name and try again
			if(curHTTP.file == MPFS_INVALID_HANDLE)
			{
				// Add the directory delimiter if needed
				if(curHTTP.data[lenB-1] != '/')
					curHTTP.data[lenB++] = '/';
				
				// Add our default file name			
				// If this is a loopback, then it's an SSL connection
				if(TCPIsLoopback(sktHTTP))
				{
					strcpypgm2ram((void*)&curHTTP.data[lenB], HTTPS_DEFAULT_FILE);
					lenB += strlenpgm(HTTPS_DEFAULT_FILE);
				}
				else
				{
					strcpypgm2ram((void*)&curHTTP.data[lenB], HTTP_DEFAULT_FILE);
					lenB += strlenpgm(HTTP_DEFAULT_FILE);
				}
					
				// Try to open again
				curHTTP.file = MPFSOpen(&curHTTP.data[1]);
			}
			
			// Find the extension in the filename
			for(ext = curHTTP.data + lenB-1; ext != curHTTP.data; ext--)
				if(*ext == '.')
					break;
					
			// Compare to known extensions to determine Content-Type
			ext++;
			for(curHTTP.fileType = HTTP_TXT; curHTTP.fileType < HTTP_UNKNOWN; curHTTP.fileType++)
				if(!stricmppgm2ram(ext, (ROM void*)httpFileExtensions[curHTTP.fileType]))
					break;
			
			// Perform first round authentication (pass file name only)
			#if defined(HTTP_USE_AUTHENTICATION)
			curHTTP.isAuthorized = HTTPAuthenticate(NULL, NULL, &curHTTP.data[1]);
			#endif
			
			// If the file was found, see if it has an index
			if(curHTTP.file != MPFS_INVALID_HANDLE &&
				(MPFSGetFlags(curHTTP.file) & MPFS2_FLAG_HASINDEX) )
			{
				curHTTP.data[lenB-1] = '#';
				curHTTP.offsets = MPFSOpen(&curHTTP.data[1]);
			}

			// Read GET args, up to buffer size - 1
			lenA = TCPFind(sktHTTP, ' ', 0, FALSE);
			if(lenA != 0)
			{
				curHTTP.hasArgs = TRUE;
				
				// Trash the '?'
				TCPGet(sktHTTP, &c);

				// Verify there's enough space
				lenA--;
				if(lenA >= HTTP_MAX_DATA_LEN - 2)
				{
			        curHTTP.httpStatus = HTTP_OVERFLOW;
					smHTTP = SM_HTTP_SERVE_HEADERS;
					isDone = FALSE;
					break;
				}

				// Read in the arguments and '&'-terminate in anticipation of cookies
				curHTTP.ptrData += TCPGetArray(sktHTTP, curHTTP.data, lenA);
				*(curHTTP.ptrData++) = '&';

			}

			// Clear the rest of the line
			lenA = TCPFind(sktHTTP, '\n', 0, FALSE);
			TCPGetArray(sktHTTP, NULL, lenA + 1);

			// Move to parsing the headers
			smHTTP = SM_HTTP_PARSE_HEADERS;
			
			// No break, continue to parsing headers

		case SM_HTTP_PARSE_HEADERS:

			// Loop over all the headers
			while(1)
			{
				// Make sure entire line is in the FIFO
				lenA = TCPFind(sktHTTP, '\n', 0, FALSE);
				if(lenA == 0xffff)
				{// If not, make sure we can receive more data
					if(TCPGetRxFIFOFree(sktHTTP) == 0)
					{// Overflow
						curHTTP.httpStatus = HTTP_OVERFLOW;
						smHTTP = SM_HTTP_SERVE_HEADERS;
						isDone = FALSE;
					}
					if(TickGet() > curHTTP.callbackID)
					{// A timeout has occured
						TCPDisconnect(sktHTTP);
						smHTTP = SM_HTTP_DISCONNECT;
						isDone = FALSE;
					}
					break;
				}
				
				// Reset the watchdog timer
				curHTTP.callbackID = TickGet() + HTTP_TIMEOUT*TICK_SECOND;
				
				// If a CRLF is immediate, then headers are done
				if(lenA == 1)
				{// Remove the CRLF and move to next state
					TCPGetArray(sktHTTP, NULL, 2);
					smHTTP = SM_HTTP_AUTHENTICATE;
					isDone = FALSE;
					break;
				}
	
				// Find the header name, and use isDone as a flag to indicate a match
				lenB = TCPFindEx(sktHTTP, ':', 0, lenA, FALSE) + 2;
				isDone = FALSE;
	
				// If name is too long or this line isn't a header, ignore it
				if(lenB > sizeof(buffer))
				{
					TCPGetArray(sktHTTP, NULL, lenA+1);
					continue;
				}
				
				// Read in the header name
				TCPGetArray(sktHTTP, buffer, lenB);
				buffer[lenB-1] = '\0';
				lenA -= lenB;
		
				// Compare header read to ones we're interested in
				for(i = 0; i < HTTP_NUM_HEADERS; i++)
				{
					if(strcmppgm2ram((char*)buffer, (ROM char *)HTTPRequestHeaders[i]) == 0)
					{// Parse the header and stop the loop
						HTTPHeaderParseLookup(i);
						isDone = TRUE;
						break;
					}
				}
				
				// Clear the rest of the line, and call the loop again
				if(isDone)
				{// We already know how much to remove unless a header was found
					lenA = TCPFind(sktHTTP, '\n', 0, FALSE);
				}
				TCPGetArray(sktHTTP, NULL, lenA+1);
			}
			
			break;

		case SM_HTTP_AUTHENTICATE:
		
			#if defined(HTTP_USE_AUTHENTICATION)
			// Check current authorization state
			if(curHTTP.isAuthorized < 0x80)
			{// 401 error
				curHTTP.httpStatus = HTTP_UNAUTHORIZED;
				smHTTP = SM_HTTP_SERVE_HEADERS;
				isDone = FALSE;
				
				#if defined(HTTP_NO_AUTH_WITHOUT_SSL)
				if(!TCPIsLoopback(sktHTTP))
					curHTTP.httpStatus = HTTP_SSL_REQUIRED;
				#endif

				break;
			}
			#endif

			// Parse the args string
			*curHTTP.ptrData = '\0';
			curHTTP.ptrData = HTTPURLDecode(curHTTP.data);

			// If this is an MPFS upload form request, bypass to headers
			#if defined(HTTP_MPFS_UPLOAD)
			if(curHTTP.httpStatus == HTTP_MPFS_FORM)
			{
				smHTTP = SM_HTTP_SERVE_HEADERS;
				isDone = FALSE;
				break;
			}
			#endif
			
			// Move on to GET args, unless there are none
			smHTTP = SM_HTTP_PROCESS_GET;
			if(!curHTTP.hasArgs)
				smHTTP = SM_HTTP_PROCESS_POST;
			isDone = FALSE;
			curHTTP.hasArgs = FALSE;
			break;

		case SM_HTTP_PROCESS_GET:

			// Run the application callback HTTPExecuteGet()
			if(HTTPExecuteGet() == HTTP_IO_WAITING)
			{// If waiting for asynchronous process, return to main app
				break;
			}

			// Move on to POST data
			smHTTP = SM_HTTP_PROCESS_POST;

		case SM_HTTP_PROCESS_POST:

			#if defined(HTTP_USE_POST)
			
			// See if we have any new data
			if(TCPIsGetReady(sktHTTP) == curHTTP.callbackPos)
			{
				if(TickGet() > curHTTP.callbackID)
				{// If a timeout has occured, disconnect
					TCPDisconnect(sktHTTP);
					smHTTP = SM_HTTP_DISCONNECT;
					isDone = FALSE;
					break;
				}
			}
			
			if(curHTTP.httpStatus == HTTP_POST 
				#if defined(HTTP_MPFS_UPLOAD)
				|| (curHTTP.httpStatus >= HTTP_MPFS_UP && curHTTP.httpStatus <= HTTP_MPFS_ERROR)
				#endif
				 )
			{
				// Run the application callback HTTPExecutePost()
				#if defined(HTTP_MPFS_UPLOAD)
				if(curHTTP.httpStatus >= HTTP_MPFS_UP && curHTTP.httpStatus <= HTTP_MPFS_ERROR)
				{
					c = HTTPMPFSUpload();
					if(c == HTTP_IO_DONE)
					{
						smHTTP = SM_HTTP_SERVE_HEADERS;
						isDone = FALSE;
						break;
					}
				}
				else
				#endif
				c = HTTPExecutePost();
				
				// If waiting for asynchronous process, return to main app
				if(c == HTTP_IO_WAITING)
				{// return to main app and make sure we don't get stuck by the watchdog
					curHTTP.callbackPos = TCPIsGetReady(sktHTTP) - 1;
					break;
				} else if(c == HTTP_IO_NEED_DATA)
				{// If waiting for more data
					curHTTP.callbackPos = TCPIsGetReady(sktHTTP);
					curHTTP.callbackID = TickGet() + HTTP_TIMEOUT*TICK_SECOND;
					// If more is expected and space is available, return to main app
					if(curHTTP.byteCount > 0 && TCPGetRxFIFOFree(sktHTTP) != 0)
						break;
					else
					{// Handle cases where application ran out of data or buffer space
						curHTTP.httpStatus = HTTP_INTERNAL_SERVER_ERROR;
						smHTTP = SM_HTTP_SERVE_HEADERS;
						isDone = FALSE;
						break;
					}	
				}
			}
			#endif

			// We're done with POST
			smHTTP = SM_HTTP_PROCESS_REQUEST;
			// No break, continue to sending request

		case SM_HTTP_PROCESS_REQUEST:

			// Check for 404
            if(curHTTP.file == MPFS_INVALID_HANDLE)
            {
                curHTTP.httpStatus = HTTP_NOT_FOUND;
                smHTTP = SM_HTTP_SERVE_HEADERS;
                isDone = FALSE;
                break;
            }

			// Set up the dynamic substitutions
			curHTTP.byteCount = 0;
			if(curHTTP.offsets == MPFS_INVALID_HANDLE)
            {// If no index file, then set next offset to huge
	            curHTTP.nextCallback = 0xffffffff;
            }
            else
            {// Read in the next callback index
	            MPFSGetLong(curHTTP.offsets, &(curHTTP.nextCallback));
			}
			
			// Move to next state
			smHTTP = SM_HTTP_SERVE_HEADERS;

		case SM_HTTP_SERVE_HEADERS:

			// We're in write mode now:
			// Adjust the TCP FIFOs for optimal transmission of 
			// the HTTP response to the browser
			TCPAdjustFIFOSize(sktHTTP, 1, 0, TCP_ADJUST_GIVE_REST_TO_TX);
				
			// Send headers
			TCPPutROMString(sktHTTP, (ROM BYTE*)HTTPResponseHeaders[curHTTP.httpStatus]);
			
			// If this is a redirect, print the rest of the Location: header			   
			if(curHTTP.httpStatus == HTTP_REDIRECT)
			{
				TCPPutString(sktHTTP, curHTTP.data);
				TCPPutROMString(sktHTTP, (ROM BYTE*)"\r\n\r\n304 Redirect: ");
				TCPPutString(sktHTTP, curHTTP.data);
				TCPPutROMString(sktHTTP, (ROM BYTE*)HTTP_CRLF);
			}

			// If not GET or POST, we're done
			if(curHTTP.httpStatus != HTTP_GET && curHTTP.httpStatus != HTTP_POST)
			{// Disconnect
				smHTTP = SM_HTTP_DISCONNECT;
				break;
			}

			// Output the content type, if known
			if(curHTTP.fileType != HTTP_UNKNOWN)
			{
				TCPPutROMString(sktHTTP, (ROM BYTE*)"Content-Type: ");
				TCPPutROMString(sktHTTP, (ROM BYTE*)httpContentTypes[curHTTP.fileType]);
				TCPPutROMString(sktHTTP, HTTP_CRLF);
			}
			
			// Output the gzip encoding header if needed
			if(MPFSGetFlags(curHTTP.file) & MPFS2_FLAG_ISZIPPED)
			{
				TCPPutROMString(sktHTTP, (ROM BYTE*)"Content-Encoding: gzip\r\n");
			}
						
			// Output the cache-control
			TCPPutROMString(sktHTTP, (ROM BYTE*)"Cache-Control: ");
			if(curHTTP.httpStatus == HTTP_POST || curHTTP.nextCallback != 0xffffffff)
			{// This is a dynamic page or a POST request, so no cache
				TCPPutROMString(sktHTTP, (ROM BYTE*)"no-cache");
			}
			else
			{// This is a static page, so save it for the specified amount of time
				TCPPutROMString(sktHTTP, (ROM BYTE*)"max-age=");
				TCPPutROMString(sktHTTP, (ROM BYTE*)HTTP_CACHE_LEN);
			}
			TCPPutROMString(sktHTTP, HTTP_CRLF);
			
			// Check if we should output cookies
			if(curHTTP.hasArgs)
				smHTTP = SM_HTTP_SERVE_COOKIES;
			else
			{// Terminate the headers
				TCPPutROMString(sktHTTP, HTTP_CRLF);
				smHTTP = SM_HTTP_SERVE_BODY;
			}
	
			// Move to next stage
			isDone = FALSE;
			break;

		case SM_HTTP_SERVE_COOKIES:

			#if defined(HTTP_USE_COOKIES)
			// If the TX FIFO runs out of space, the client will never get CRLFCRLF
			// Avoid writing huge cookies - keep it under a hundred bytes max

			// Write cookies one at a time as space permits
			for(curHTTP.ptrRead = curHTTP.data; curHTTP.hasArgs != 0; curHTTP.hasArgs--)
			{
				// Write the header
				TCPPutROMString(sktHTTP, (ROM BYTE*)"Set-Cookie: ");

				// Write the name, URL encoded, one character at a time
				while((c = *(curHTTP.ptrRead++)))
				{
					if(c == ' ')
						TCPPut(sktHTTP, '+');
					else if(c < '0' || (c > '9' && c < 'A') || (c > 'Z' && c < 'a') || c > 'z')
					{
						TCPPut(sktHTTP, '%');
						TCPPut(sktHTTP, btohexa_high(c));
						TCPPut(sktHTTP, btohexa_low(c));
					}
					else
						TCPPut(sktHTTP, c);
				}
				
				TCPPut(sktHTTP, '=');
				
				// Write the value, URL encoded, one character at a time
				while((c = *(curHTTP.ptrRead++)))
				{
					if(c == ' ')
						TCPPut(sktHTTP, '+');
					else if(c < '0' || (c > '9' && c < 'A') || (c > 'Z' && c < 'a') || c > 'z')
					{
						TCPPut(sktHTTP, '%');
						TCPPut(sktHTTP, btohexa_high(c));
						TCPPut(sktHTTP, btohexa_low(c));
					}
					else
						TCPPut(sktHTTP, c);
				}
				
				// Finish the line
				TCPPutROMString(sktHTTP, HTTP_CRLF);

			}
			#endif

			// We're done, move to next state
			TCPPutROMString(sktHTTP, HTTP_CRLF);
			smHTTP = SM_HTTP_SERVE_BODY;

		case SM_HTTP_SERVE_BODY:

			isDone = FALSE;

			// Try to send next packet
			if(HTTPSendFile())
			{// If EOF, then we're done so close and disconnect
				MPFSClose(curHTTP.file);
				curHTTP.file = MPFS_INVALID_HANDLE;
				smHTTP = SM_HTTP_DISCONNECT;
				isDone = TRUE;
			}
			
			// If the TX FIFO is full, then return to main app loop
			if(TCPIsPutReady(sktHTTP) == 0)
				isDone = TRUE;
            break;

		case SM_HTTP_SEND_FROM_CALLBACK:

			isDone = TRUE;

			// Check that at least the minimum bytes are free
			if(TCPIsPutReady(sktHTTP) < HTTP_MIN_CALLBACK_FREE)
				break;

			// Fill TX FIFO from callback
			HTTPPrint(curHTTP.callbackID);
			
			if(curHTTP.callbackPos == 0)
			{// Callback finished its output, so move on
				isDone = FALSE;
				smHTTP = SM_HTTP_SERVE_BODY;
			}// Otherwise, callback needs more buffer space, so return and wait
			
			break;

		case SM_HTTP_DISCONNECT:
		
			// Loopbacks have no wait state, so all data must be retrieved first
			if(TCPIsLoopback(sktHTTP) && TCPGetTxFIFOFull(sktHTTP) != 0)
				break;

			// Make sure any opened files are closed
			if(curHTTP.file != MPFS_INVALID_HANDLE)
			{
				MPFSClose(curHTTP.file);
				curHTTP.file = MPFS_INVALID_HANDLE;
			}
			if(curHTTP.offsets != MPFS_INVALID_HANDLE)
			{
				MPFSClose(curHTTP.offsets);
				curHTTP.offsets = MPFS_INVALID_HANDLE;
			}

			TCPDisconnect(sktHTTP);
            smHTTP = SM_HTTP_IDLE;
            break;
		}
	} while(!isDone);

}