--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/speedcheck.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,73 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#include <curl/curl.h>
+#include "urldata.h"
+#include "sendf.h"
+#include "multiif.h"
+#include "speedcheck.h"
+
+void Curl_speedinit(struct Curl_easy *data)
+{
+  memset(&data->state.keeps_speed, 0, sizeof(struct curltime));
+}
+
+/*
+ * @unittest: 1606
+ */
+CURLcode Curl_speedcheck(struct Curl_easy *data,
+                         struct curltime now)
+{
+  if((data->progress.current_speed >= 0) && data->set.low_speed_time) {
+    if(data->progress.current_speed < data->set.low_speed_limit) {
+      if(!data->state.keeps_speed.tv_sec)
+        /* under the limit at this very moment */
+        data->state.keeps_speed = now;
+      else {
+        /* how long has it been under the limit */
+        timediff_t howlong = Curl_timediff(now, data->state.keeps_speed);
+
+        if(howlong >= data->set.low_speed_time * 1000) {
+          /* too long */
+          failf(data,
+                "Operation too slow. "
+                "Less than %ld bytes/sec transferred the last %ld seconds",
+                data->set.low_speed_limit,
+                data->set.low_speed_time);
+          return CURLE_OPERATION_TIMEDOUT;
+        }
+      }
+    }
+    else
+      /* faster right now */
+      data->state.keeps_speed.tv_sec = 0;
+  }
+
+  if(data->set.low_speed_limit)
+    /* if low speed limit is enabled, set the expire timer to make this
+       connection's speed get checked again in a second */
+    Curl_expire(data, 1000, EXPIRE_SPEEDCHECK);
+
+  return CURLE_OK;
+}