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