/*
 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 * This version of the file has been modified by Texas Instruments to offer
 * simple server-side-include (SSI) and Common Gateway Interface (CGI)
 * capability.
 */

#ifndef __HTTPD_H__
#define __HTTPD_H__

void httpd_init(void);

#ifdef INCLUDE_HTTPD_CGI

/*
 * Function pointer for a CGI script handler.
 *
 * This function is called each time the HTTPD server is asked for a file
 * whose name was previously registered as a CGI function using a call to
 * http_set_cgi_handler. The iIndex parameter provides the index of the
 * CGI within the ppcURLs array passed to http_set_cgi_handler. Parameters
 * pcParam and pcValue provide access to the parameters provided along with
 * the URI. iNumParams provides a count of the entries in the pcParam and
 * pcValue arrays. Each entry in the pcParam array contains the name of a
 * parameter with the corresponding entry in the pcValue array containing the
 * value for that parameter. Note that pcParam may contain multiple elements
 * with the same name if, for example, a multi-selection list control is used
 * in the form generating the data.
 *
 * The function should return a pointer to a character string which is the
 * path and filename of the response that is to be sent to the connected
 * browser, for example "/thanks.htm" or "/response/error.ssi".
 *
 * The maximum number of parameters that will be passed to this function via
 * iNumParams is defined by MAX_CGI_PARAMETERS. Any parameters in the incoming
 * HTTP request above this number will be discarded.
 *
 * Requests intended for use by this CGI mechanism must be sent using the GET
 * method (which encodes all parameters within the URI rather than in a block
 * later in the request). Attempts to use the POST method will result in the
 * request being ignored.
 *
 */
typedef char *(*tCGIHandler)(int iIndex, int iNumParams, char *pcParam[],
                             char *pcValue[]);

/*
 * Structure defining the base filename (URL) of a CGI and the associated
 * function which is to be called when that URL is requested.
 */
typedef struct
{
    const char *pcCGIName;
    tCGIHandler pfnCGIHandler;
} tCGI;

void http_set_cgi_handlers(const tCGI *pCGIs, int iNumHandlers);


/* The maximum number of parameters that the CGI handler can be sent. */
#ifndef MAX_CGI_PARAMETERS
#define MAX_CGI_PARAMETERS 16
#endif

#endif

#ifdef INCLUDE_HTTPD_SSI

/*
 * Function pointer for the SSI tag handler callback.
 *
 * This function will be called each time the HTTPD server detects a tag of the
 * form <!--#name--> in a .shtml, .ssi or .shtm file where "name" appears as
 * one of the tags supplied to http_set_ssi_handler in the ppcTags array. The
 * returned insert string, which will replace the whole string "<!--#name-->"
 * in file sent back to the client,should be written to pointer pcInsert.
 * iInsertLen contains the size of the buffer pointed to by pcInsert. The
 * iIndex parameter provides the zero-based index of the tag as found in the
 * ppcTags array and identifies the tag that is to be replaced.
 *
 * The handler returns the number of characters written to pcInsert excluding
 * any terminating NULL or a negative number to indicate a failure (tag not
 * recognized, for example).
 *
 */
typedef int (*tSSIHandler)(int iIndex, char *pcInsert, int iInsertLen);

void http_set_ssi_handler(tSSIHandler pfnSSIHandler,
                          const char **ppcTags, int iNumTags);

/* The maximum length of the string comprising the tag name */
#ifndef MAX_TAG_NAME_LEN
#define MAX_TAG_NAME_LEN 8
#endif

/* The maximum length of string that can be returned to replace any given tag */
#ifndef MAX_TAG_INSERT_LEN
#define MAX_TAG_INSERT_LEN 192
#endif

#endif

#endif /* __HTTPD_H__ */
