--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/src/tool_cb_rea.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,54 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2012, 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 "tool_setup.h"
+
+#define ENABLE_CURLX_PRINTF
+/* use our own printf() functions */
+#include "curlx.h"
+
+#include "tool_cfgable.h"
+#include "tool_cb_rea.h"
+
+#include "memdebug.h" /* keep this as LAST include */
+
+/*
+** callback for CURLOPT_READFUNCTION
+*/
+
+size_t tool_read_cb(void *buffer, size_t sz, size_t nmemb, void *userdata)
+{
+  ssize_t rc;
+  struct InStruct *in = userdata;
+
+  rc = read(in->fd, buffer, sz*nmemb);
+  if(rc < 0) {
+    if(errno == EAGAIN) {
+      errno = 0;
+      in->config->readbusy = TRUE;
+      return CURL_READFUNC_PAUSE;
+    }
+    /* since size_t is unsigned we can't return negative values fine */
+    rc = 0;
+  }
+  in->config->readbusy = FALSE;
+  return (size_t)rc;
+}