brought back 7.5 file-upload as file-upload-multiple-posts; updated to latest API

renamed form-upload to file-upload-html-form
renamed file-upload to file-upload-single-post

examples/file-upload-single-post/main.c

@@ -0,0 +1,47 @@
+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+//
+// Streaming upload example. Demonstrates how to use chunked encoding
+// to send large payload in smaller chunks. To test, use curl utility:
+//
+// curl http://localhost:8000/upload?name=a.txt --data-binary @large_file.txt
+
+#include "mongoose.h"
+
+// HTTP request handler function. It implements the following endpoints:
+//   /upload - Saves the next file chunk
+//   all other URI - serves web_root/ directory
+static void cb(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+  if (ev == MG_EV_HTTP_CHUNK && mg_http_match_uri(hm, "/upload")) {
+    MG_INFO(("Got chunk len %lu", (unsigned long) hm->chunk.len));
+    MG_INFO(("Query string: [%.*s]", (int) hm->query.len, hm->query.ptr));
+    // MG_INFO(("Chunk data:\n%.*s", (int) hm->chunk.len, hm->chunk.ptr));
+    mg_http_delete_chunk(c, hm);
+    if (hm->chunk.len == 0) {
+      MG_INFO(("Last chunk received, sending response"));
+      mg_http_reply(c, 200, "", "ok (chunked)\n");
+    }
+  } else if (ev == MG_EV_HTTP_MSG && mg_http_match_uri(hm, "/upload")) {
+    MG_INFO(("Got all %lu bytes!", (unsigned long) hm->body.len));
+    MG_INFO(("Query string: [%.*s]", (int) hm->query.len, hm->query.ptr));
+    // MG_INFO(("Body:\n%.*s", (int) hm->body.len, hm->body.ptr));
+    mg_http_reply(c, 200, "", "ok (%lu)\n", (unsigned long) hm->body.len);
+  } else if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_serve_opts opts = {.root_dir = "web_root"};
+    mg_http_serve_dir(c, hm, &opts);
+  }
+}
+
+int main(void) {
+  struct mg_mgr mgr;
+
+  mg_mgr_init(&mgr);
+  mg_log_set("3");
+  mg_http_listen(&mgr, "http://localhost:8000", cb, NULL);
+
+  for (;;) mg_mgr_poll(&mgr, 50);
+  mg_mgr_free(&mgr);
+
+  return 0;
+}