/*
This file is part of libmicrohttpd
Copyright (C) 2015 Christian Grothoff (and other contributing authors)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file chunked_example.c
* @brief example for generating chunked encoding with libmicrohttpd
* @author Christian Grothoff
* @author Karlson2k (Evgeny Grin)
*/
#include "platform.h"
#include <microhttpd.h>
struct ResponseContentCallbackParam
{
const char *response_data;
size_t response_size;
};
static ssize_t
callback (void *cls,
uint64_t pos,
char *buf,
size_t buf_size)
{
size_t size_to_copy;
struct ResponseContentCallbackParam * const param =
(struct ResponseContentCallbackParam *)cls;
/* Note: 'pos' will never exceed size of transmitted data. */
/* You can use 'pos == param->response_size' in next check. */
if (pos >= param->response_size)
{ /* Whole response was sent. Signal end of response. */
return MHD_CONTENT_READER_END_OF_STREAM;
}
/* Pseudo code. *
if (data_not_ready)
{
// Callback will be called again on next loop.
// Consider suspending connection until data will be ready.
return 0;
}
* End of pseudo code. */
if (buf_size < (param->response_size - pos))
size_to_copy = buf_size;
else
size_to_copy = param->response_size - pos;
memcpy (buf, param->response_data + pos, size_to_copy);
/* Pseudo code. *
if (error_preparing_response)
{
// Close connection with error.
return MHD_CONTENT_READER_END_WITH_ERROR;
}
* End of pseudo code. */
/* Return amount of data copied to buffer. */
return size_to_copy;
}
static void
free_callback_param (void *cls)
{
free(cls);
}
static const char simple_response_text[] = "<html><head><title>Simple response</title></head>"
"<body>Simple response text</body></html>";
static int
ahc_echo (void *cls,
struct MHD_Connection *connection,
const char *url,
const char *method,
const char *version,
const char *upload_data,
size_t *upload_data_size,
void **ptr)
{
static int aptr;
struct ResponseContentCallbackParam *callback_param;
struct MHD_Response *response;
int ret;
(void)cls; /* Unused. Silent compiler warning. */
(void)url; /* Unused. Silent compiler warning. */
(void)version; /* Unused. Silent compiler warning. */
(void)upload_data; /* Unused. Silent compiler warning. */
(void)upload_data_size; /* Unused. Silent compiler warning. */
if (0 != strcmp (method, "GET"))
return MHD_NO; /* unexpected method */
if (&aptr != *ptr)
{
/* do never respond on first call */
*ptr = &aptr;
return MHD_YES;
}
callback_param = malloc (sizeof(struct ResponseContentCallbackParam));
if (NULL == callback_param)
return MHD_NO; /* Not enough memory. */
callback_param->response_data = simple_response_text;
callback_param->response_size = (sizeof(simple_response_text)/sizeof(char)) - 1;
*ptr = NULL; /* reset when done */
response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
1024,
&callback,
callback_param,
&free_callback_param);
if (NULL == response)
{
free (callback_param);
return MHD_NO;
}
ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
MHD_destroy_response (response);
return ret;
}
int
main (int argc, char *const *argv)
{
struct MHD_Daemon *d;
int port;
if (argc != 2)
{
printf ("%s PORT\n", argv[0]);
return 1;
}
port = atoi (argv[1]);
if ( (1 > port) ||
(port > UINT16_MAX) )
{
fprintf (stderr,
"Port must be a number between 1 and 65535\n");
return 1;
}
d = MHD_start_daemon (/* MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG, */
MHD_USE_AUTO | MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG,
/* MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG | MHD_USE_POLL, */
/* MHD_USE_THREAD_PER_CONNECTION | MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG | MHD_USE_POLL, */
/* MHD_USE_THREAD_PER_CONNECTION | MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG, */
(uint16_t) port,
NULL, NULL,
&ahc_echo, NULL,
MHD_OPTION_CONNECTION_TIMEOUT, (unsigned int) 120,
MHD_OPTION_END);
if (NULL == d)
return 1;
(void) getc (stdin);
MHD_stop_daemon (d);
return 0;
}