move to new skeleton

tutorials/http/file-upload-multiple-posts/Makefile

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+PROG ?= example                   # Program we are building
+DELETE = rm -rf                   # Command to remove files
+OUT ?= -o $(PROG)                 # Compiler argument for output file
+SOURCES = main.c mongoose.c       # Source code files
+CFLAGS = -W -Wall -Wextra -g -I.  # Build options
+
+# Mongoose build options. See https://mongoose.ws/documentation/#build-options
+#CFLAGS_MONGOOSE += -DMG_ENABLE_LINES
+
+ifeq ($(OS),Windows_NT)   # Windows settings. Assume MinGW compiler. To use VC: make CC=cl CFLAGS=/MD OUT=/Feprog.exe
+  PROG ?= example.exe           # Use .exe suffix for the binary
+  CC = gcc                      # Use MinGW gcc compiler
+  CFLAGS += -lws2_32            # Link against Winsock library
+  DELETE = cmd /C del /Q /F /S  # Command prompt command to delete files
+  OUT ?= -o $(PROG)             # Build output
+endif
+
+all: $(PROG)              # Default target. Build and run program
+	$(RUN) ./$(PROG) $(ARGS)
+
+$(PROG): $(SOURCES)       # Build program from sources
+	$(CC) $(SOURCES) $(CFLAGS) $(CFLAGS_MONGOOSE) $(CFLAGS_EXTRA) $(OUT)
+
+clean:                    # Cleanup. Delete built program and all build artifacts
+	$(DELETE) $(PROG) *.o *.obj *.exe *.dSYM

tutorials/http/file-upload-multiple-posts/README.md

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+See detailed tutorial at https://mongoose.ws/tutorials/http/file-uploads/

tutorials/http/file-upload-multiple-posts/main.c

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+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+
+#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) {
+  if (ev == MG_EV_HTTP_MSG) {
+    struct mg_http_message *hm = (struct mg_http_message *) ev_data;
+    if (mg_match(hm->uri, mg_str("/upload"), NULL)) {
+      mg_http_upload(c, hm, &mg_fs_posix, "/tmp", 99999);
+    } 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(MG_LL_DEBUG);  // Set log level
+  mg_http_listen(&mgr, "http://localhost:8000", cb, NULL);
+
+  for (;;) mg_mgr_poll(&mgr, 50);
+  mg_mgr_free(&mgr);
+
+  return 0;
+}

tutorials/http/file-upload-multiple-posts/mongoose.c

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+../../../mongoose.c

tutorials/http/file-upload-multiple-posts/mongoose.h

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+../../../mongoose.h

tutorials/http/file-upload-multiple-posts/web_root/app.js

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+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+
+// Helper function to display upload status
+var setStatus = function(text) {
+  document.getElementById('el3').innerText = text;
+};
+
+// When user clicks on a button, trigger file selection dialog
+var button = document.getElementById('el2');
+button.onclick = function(ev) {
+  input.click();
+};
+
+// Send a large blob of data chunk by chunk
+var sendFileData = function(name, data, chunkSize) {
+  var sendChunk = function(offset) {
+    var chunk = data.subarray(offset, offset + chunkSize) || '';
+    var opts = {method: 'POST', body: chunk};
+    var url = '/upload?offset=' + offset + '&file=' + encodeURIComponent(name);
+    var ok;
+    setStatus(
+        'Uploading ' + name + ', bytes ' + offset + '..' +
+        (offset + chunk.length) + ' of ' + data.length);
+    fetch(url, opts)
+        .then(function(res) {
+          if (res.ok && chunk.length > 0) sendChunk(offset + chunk.length);
+          ok = res.ok;
+          return res.text();
+        })
+        .then(function(text) {
+          if (!ok) setStatus('Error: ' + text);
+        });
+  };
+  sendChunk(0);
+};
+
+// If user selected a file, read it into memory and trigger sendFileData()
+var input = document.getElementById('el1');
+input.onchange = function(ev) {
+  if (!ev.target.files[0]) return;
+  var f = ev.target.files[0], r = new FileReader();
+  r.readAsArrayBuffer(f);
+  r.onload = function() {
+    ev.target.value = '';
+    sendFileData(f.name, new Uint8Array(r.result), 2048);
+  };
+};

tutorials/http/file-upload-multiple-posts/web_root/index.html

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+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <title>example</title>
+    <meta charset="utf-8" />
+    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <style>
+      #container { margin-right: auto; margin-left: auto; max-width: 480px; }
+      #info { background: #e0f0f0; border-radius: .5em; padding: 2em;  }
+      #wrapper { margin-top: 1em; }
+    </style>
+  </head>
+  <body>
+    <div id="container">
+      <div id="info">
+        Mongoose always buffers a full HTTP message before invoking
+        the MG_EV_HTTP_MSG event. A big POST request would require a lot
+        of RAM to buffer everything. Therefore, in order to upload large
+        files on memory-constrained systems, a large file should be sent
+        in small chunks.
+        <br/><br/>
+        In this example, the JavaScript code on this page sends the chosen
+        file in 2Kb chunks using the <code>/upload</code> endpoint.
+        The uploaded file is stored in the <code>/tmp</code> directory by
+        the helper API function <code>mg_http_upload()</code>
+      </div>
+      <div id="wrapper">
+        <input type="file" id="el1" style="display: none"/>
+        <button id="el2">choose file...</button>
+        <div id="el3"></div>
+      </div>
+    </div>
+  </body>
+  <script src="app.js"></script>
+</html>