--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/vauth/vauth.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,147 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 2014 - 2019, Steve Holme, <steve_holme@hotmail.com>.
+ *
+ * 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 "vauth.h"
+#include "curl_multibyte.h"
+#include "curl_printf.h"
+
+/* The last #include files should be: */
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/*
+ * Curl_auth_build_spn()
+ *
+ * This is used to build a SPN string in the following formats:
+ *
+ * service/host@realm (Not currently used)
+ * service/host       (Not used by GSS-API)
+ * service@realm      (Not used by Windows SSPI)
+ *
+ * Parameters:
+ *
+ * service  [in] - The service type such as http, smtp, pop or imap.
+ * host     [in] - The host name.
+ * realm    [in] - The realm.
+ *
+ * Returns a pointer to the newly allocated SPN.
+ */
+#if !defined(USE_WINDOWS_SSPI)
+char *Curl_auth_build_spn(const char *service, const char *host,
+                          const char *realm)
+{
+  char *spn = NULL;
+
+  /* Generate our SPN */
+  if(host && realm)
+    spn = aprintf("%s/%s@%s", service, host, realm);
+  else if(host)
+    spn = aprintf("%s/%s", service, host);
+  else if(realm)
+    spn = aprintf("%s@%s", service, realm);
+
+  /* Return our newly allocated SPN */
+  return spn;
+}
+#else
+TCHAR *Curl_auth_build_spn(const char *service, const char *host,
+                           const char *realm)
+{
+  char *utf8_spn = NULL;
+  TCHAR *tchar_spn = NULL;
+
+  (void) realm;
+
+  /* Note: We could use DsMakeSPN() or DsClientMakeSpnForTargetServer() rather
+     than doing this ourselves but the first is only available in Windows XP
+     and Windows Server 2003 and the latter is only available in Windows 2000
+     but not Windows95/98/ME or Windows NT4.0 unless the Active Directory
+     Client Extensions are installed. As such it is far simpler for us to
+     formulate the SPN instead. */
+
+  /* Generate our UTF8 based SPN */
+  utf8_spn = aprintf("%s/%s", service, host);
+  if(!utf8_spn) {
+    return NULL;
+  }
+
+  /* Allocate our TCHAR based SPN */
+  tchar_spn = Curl_convert_UTF8_to_tchar(utf8_spn);
+  if(!tchar_spn) {
+    free(utf8_spn);
+
+    return NULL;
+  }
+
+  /* Release the UTF8 variant when operating with Unicode */
+  Curl_unicodefree(utf8_spn);
+
+  /* Return our newly allocated SPN */
+  return tchar_spn;
+}
+#endif /* USE_WINDOWS_SSPI */
+
+/*
+ * Curl_auth_user_contains_domain()
+ *
+ * This is used to test if the specified user contains a Windows domain name as
+ * follows:
+ *
+ * Domain\User (Down-level Logon Name)
+ * Domain/User (curl Down-level format - for compatibility with existing code)
+ * User@Domain (User Principal Name)
+ *
+ * Note: The user name may be empty when using a GSS-API library or Windows
+ * SSPI as the user and domain are either obtained from the credentials cache
+ * when using GSS-API or via the currently logged in user's credentials when
+ * using Windows SSPI.
+ *
+ * Parameters:
+ *
+ * user  [in] - The user name.
+ *
+ * Returns TRUE on success; otherwise FALSE.
+ */
+bool Curl_auth_user_contains_domain(const char *user)
+{
+  bool valid = FALSE;
+
+  if(user && *user) {
+    /* Check we have a domain name or UPN present */
+    char *p = strpbrk(user, "\\/@");
+
+    valid = (p != NULL && p > user && p < user + strlen(user) - 1 ? TRUE :
+                                                                    FALSE);
+  }
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+  else
+    /* User and domain are obtained from the GSS-API credentials cache or the
+       currently logged in user from Windows */
+    valid = TRUE;
+#endif
+
+  return valid;
+}