Simple response

/* 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 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[] = "Simple response" "Simple response text"; 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; }