Update networking layer w/ CURL and emscripten impl

External/curl-8.17.0/docs/libcurl/opts/CURLOPT_CHUNK_END_FUNCTION.md

@@ -0,0 +1,85 @@
+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_CHUNK_END_FUNCTION
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_CHUNK_BGN_FUNCTION (3)
+  - CURLOPT_WILDCARDMATCH (3)
+Protocol:
+  - FTP
+Added-in: 7.21.0
+---
+
+# NAME
+
+CURLOPT_CHUNK_END_FUNCTION - callback after a transfer with FTP wildcard match
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+long chunk_end_callback(void *ptr);
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CHUNK_END_FUNCTION,
+                          chunk_end_callback);
+~~~
+
+# DESCRIPTION
+
+Pass a pointer to your callback function, which should match the prototype
+shown above.
+
+This function gets called by libcurl as soon as a part of the stream has been
+transferred (or skipped).
+
+Return *CURL_CHUNK_END_FUNC_OK* if everything is fine or
+**CURL_CHUNK_END_FUNC_FAIL** to tell the lib to stop if some error occurred.
+
+# DEFAULT
+
+NULL
+
+# %PROTOCOLS%
+
+# EXAMPLE
+
+~~~c
+#include <stdio.h>
+
+struct callback_data {
+   FILE *output;
+};
+
+static long file_is_downloaded(void *ptr)
+{
+  struct callback_data *data = ptr;
+  if(data->output) {
+    fclose(data->output);
+    data->output = 0x0;
+  }
+  return CURL_CHUNK_END_FUNC_OK;
+}
+
+int main()
+{
+  /* data for callback */
+  struct callback_data callback_info;
+
+  CURL *curl = curl_easy_init();
+
+  curl_easy_setopt(curl, CURLOPT_CHUNK_END_FUNCTION, file_is_downloaded);
+  curl_easy_setopt(curl, CURLOPT_CHUNK_DATA, &callback_info);
+}
+~~~
+
+# %AVAILABILITY%
+
+# RETURN VALUE
+
+curl_easy_setopt(3) returns a CURLcode indicating success or error.
+
+CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
+libcurl-errors(3).