mirror of
https://github.com/lwip-tcpip/lwip.git
synced 2024-11-05 08:28:32 +00:00
187 lines
5.7 KiB
C
187 lines
5.7 KiB
C
/**
|
|
* @file
|
|
* HTTPD custom file system example for runtime generated files
|
|
*
|
|
* This file demonstrates how to add support for generated files to httpd.
|
|
*/
|
|
|
|
/*
|
|
* Copyright (c) 2017 Simon Goldschmidt
|
|
* 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: Simon Goldschmidt <goldsimon@gmx.de>
|
|
*
|
|
*/
|
|
|
|
#include "lwip/opt.h"
|
|
#include "genfiles_example.h"
|
|
|
|
#include "lwip/apps/fs.h"
|
|
#include "lwip/def.h"
|
|
#include "lwip/mem.h"
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
/** define LWIP_HTTPD_EXAMPLE_GENERATEDFILES to 1 to enable this file system */
|
|
#ifndef LWIP_HTTPD_EXAMPLE_GENERATEDFILES
|
|
#define LWIP_HTTPD_EXAMPLE_GENERATEDFILES 0
|
|
#endif
|
|
|
|
#if LWIP_HTTPD_EXAMPLE_GENERATEDFILES
|
|
|
|
#if !LWIP_HTTPD_CUSTOM_FILES
|
|
#error This needs LWIP_HTTPD_CUSTOM_FILES
|
|
#endif
|
|
#if !LWIP_HTTPD_FILE_EXTENSION
|
|
#error This needs LWIP_HTTPD_FILE_EXTENSION
|
|
#endif
|
|
#if !LWIP_HTTPD_DYNAMIC_HEADERS
|
|
#error This needs LWIP_HTTPD_DYNAMIC_HEADERS
|
|
#endif
|
|
|
|
/* This is the page we send. It's not generated, as you see.
|
|
* Generating custom things instead of memcpy is left to your imagination :-)
|
|
*/
|
|
const char generated_html[] =
|
|
"<html>\n"
|
|
"<head><title>lwIP - A Lightweight TCP/IP Stack</title></head>\n"
|
|
" <body bgcolor=\"white\" text=\"black\">\n"
|
|
" <table width=\"100%\">\n"
|
|
" <tr valign=\"top\">\n"
|
|
" <td width=\"80\">\n"
|
|
" <a href=\"http://www.sics.se/\"><img src=\"/img/sics.gif\"\n"
|
|
" border=\"0\" alt=\"SICS logo\" title=\"SICS logo\"></a>\n"
|
|
" </td>\n"
|
|
" <td width=\"500\">\n"
|
|
" <h1>lwIP - A Lightweight TCP/IP Stack</h1>\n"
|
|
" <h2>Generated page</h2>\n"
|
|
" <p>This page might be generated in-memory at runtime</p>\n"
|
|
" </td>\n"
|
|
" <td>\n"
|
|
" \n"
|
|
" </td>\n"
|
|
" </tr>\n"
|
|
" </table>\n"
|
|
" </body>\n"
|
|
"</html>";
|
|
|
|
|
|
void
|
|
genfiles_ex_init(void)
|
|
{
|
|
/* nothing to do here yet */
|
|
}
|
|
|
|
int
|
|
fs_open_custom(struct fs_file *file, const char *name)
|
|
{
|
|
/* this example only provides one file */
|
|
if (!strcmp(name, "/generated.html")) {
|
|
/* initialize fs_file correctly */
|
|
memset(file, 0, sizeof(struct fs_file));
|
|
file->pextension = mem_malloc(sizeof(generated_html));
|
|
if (file->pextension != NULL) {
|
|
/* instead of doing memcpy, you would generate e.g. a JSON here */
|
|
memcpy(file->pextension, generated_html, sizeof(generated_html));
|
|
file->data = (const char *)file->pextension;
|
|
file->len = sizeof(generated_html) - 1; /* don't send the trailing 0 */
|
|
file->index = file->len;
|
|
/* allow persisteng connections */
|
|
file->flags = FS_FILE_FLAGS_HEADER_PERSISTENT;
|
|
return 1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
fs_close_custom(struct fs_file *file)
|
|
{
|
|
if (file && file->pextension) {
|
|
mem_free(file->pextension);
|
|
file->pextension = NULL;
|
|
}
|
|
}
|
|
|
|
#if LWIP_HTTPD_FS_ASYNC_READ
|
|
u8_t
|
|
fs_canread_custom(struct fs_file *file)
|
|
{
|
|
LWIP_UNUSED_ARG(file);
|
|
/* This example does not use delayed/async reading */
|
|
return 1;
|
|
}
|
|
|
|
u8_t
|
|
fs_wait_read_custom(struct fs_file *file, fs_wait_cb callback_fn, void *callback_arg)
|
|
{
|
|
LWIP_ASSERT("not implemented in this example configuration", 0);
|
|
LWIP_UNUSED_ARG(file);
|
|
LWIP_UNUSED_ARG(callback_fn);
|
|
LWIP_UNUSED_ARG(callback_arg);
|
|
/* Return
|
|
- 1 if ready to read (at least one byte)
|
|
- 0 if reading should be delayed (call 'tcpip_callback(callback_fn, callback_arg)' when ready) */
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
fs_read_async_custom(struct fs_file *file, char *buffer, int count, fs_wait_cb callback_fn, void *callback_arg)
|
|
{
|
|
LWIP_ASSERT("not implemented in this example configuration", 0);
|
|
LWIP_UNUSED_ARG(file);
|
|
LWIP_UNUSED_ARG(buffer);
|
|
LWIP_UNUSED_ARG(count);
|
|
LWIP_UNUSED_ARG(callback_fn);
|
|
LWIP_UNUSED_ARG(callback_arg);
|
|
/* Return
|
|
- FS_READ_EOF if all bytes have been read
|
|
- FS_READ_DELAYED if reading is delayed (call 'tcpip_callback(callback_fn, callback_arg)' when done) */
|
|
/* all bytes read already */
|
|
return FS_READ_EOF;
|
|
}
|
|
|
|
#else /* LWIP_HTTPD_FS_ASYNC_READ */
|
|
int
|
|
fs_read_custom(struct fs_file *file, char *buffer, int count)
|
|
{
|
|
LWIP_ASSERT("not implemented in this example configuration", 0);
|
|
LWIP_UNUSED_ARG(file);
|
|
LWIP_UNUSED_ARG(buffer);
|
|
LWIP_UNUSED_ARG(count);
|
|
/* Return
|
|
- FS_READ_EOF if all bytes have been read
|
|
- FS_READ_DELAYED if reading is delayed (call 'tcpip_callback(callback_fn, callback_arg)' when done) */
|
|
/* all bytes read already */
|
|
return FS_READ_EOF;
|
|
}
|
|
|
|
#endif /* LWIP_HTTPD_FS_ASYNC_READ */
|
|
|
|
#endif /* LWIP_HTTPD_EXAMPLE_GENERATEDFILES */
|