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-html-form/main.c

@@ -0,0 +1,51 @@
+// Copyright (c) 2021 Cesanta Software Limited
+// All rights reserved
+
+#include "mongoose.h"
+
+// HTTP request handler function. It implements the following endpoints:
+//   /upload - prints all submitted form elements
+//   all other URI - serves web_root/ directory
+//
+// /////////////////           IMPORTANT        //////////////////////////
+//
+// Mongoose has a limit on input buffer, which also limits maximum upload size.
+// It is controlled by the MG_MAX_RECV_SIZE constant, which is set by
+// default to (3 * 1024 * 1024), i.e. 3 megabytes.
+// Use -DMG_MAX_BUF_SIZE=NEW_LIMIT to override it.
+//
+// Also, consider changing -DMG_IO_SIZE=SOME_BIG_VALUE to increase IO buffer
+// increment when reading data.
+static void cb(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
+  if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    MG_INFO(("New request to: [%.*s], body size: %lu", (int) hm->uri.len,
+             hm->uri.ptr, (unsigned long) hm->body.len));
+    if (mg_http_match_uri(hm, "/upload")) {
+      struct mg_http_part part;
+      size_t ofs = 0;
+      while ((ofs = mg_http_next_multipart(hm->body, ofs, &part)) > 0) {
+        MG_INFO(("Chunk name: [%.*s] filename: [%.*s] length: %lu bytes",
+                 (int) part.name.len, part.name.ptr, (int) part.filename.len,
+                 part.filename.ptr, (unsigned long) part.body.len));
+      }
+      mg_http_reply(c, 200, "", "Thank you!");
+    } else {
+      struct mg_http_serve_opts opts = {.root_dir = "web_root"};
+      mg_http_serve_dir(c, ev_data, &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;
+}