--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/asyn.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,183 @@
+#ifndef HEADER_CURL_ASYN_H
+#define HEADER_CURL_ASYN_H
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2019, 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_addrinfo.h"
+
+struct addrinfo;
+struct hostent;
+struct Curl_easy;
+struct connectdata;
+struct Curl_dns_entry;
+
+/*
+ * This header defines all functions in the internal asynch resolver interface.
+ * All asynch resolvers need to provide these functions.
+ * asyn-ares.c and asyn-thread.c are the current implementations of asynch
+ * resolver backends.
+ */
+
+/*
+ * Curl_resolver_global_init()
+ *
+ * Called from curl_global_init() to initialize global resolver environment.
+ * Returning anything else than CURLE_OK fails curl_global_init().
+ */
+int Curl_resolver_global_init(void);
+
+/*
+ * Curl_resolver_global_cleanup()
+ * Called from curl_global_cleanup() to destroy global resolver environment.
+ */
+void Curl_resolver_global_cleanup(void);
+
+/*
+ * Curl_resolver_init()
+ * Called from curl_easy_init() -> Curl_open() to initialize resolver
+ * URL-state specific environment ('resolver' member of the UrlState
+ * structure).  Should fill the passed pointer by the initialized handler.
+ * Returning anything else than CURLE_OK fails curl_easy_init() with the
+ * correspondent code.
+ */
+CURLcode Curl_resolver_init(struct Curl_easy *easy, void **resolver);
+
+/*
+ * Curl_resolver_cleanup()
+ * Called from curl_easy_cleanup() -> Curl_close() to cleanup resolver
+ * URL-state specific environment ('resolver' member of the UrlState
+ * structure).  Should destroy the handler and free all resources connected to
+ * it.
+ */
+void Curl_resolver_cleanup(void *resolver);
+
+/*
+ * Curl_resolver_duphandle()
+ * Called from curl_easy_duphandle() to duplicate resolver URL-state specific
+ * environment ('resolver' member of the UrlState structure).  Should
+ * duplicate the 'from' handle and pass the resulting handle to the 'to'
+ * pointer.  Returning anything else than CURLE_OK causes failed
+ * curl_easy_duphandle() call.
+ */
+CURLcode Curl_resolver_duphandle(struct Curl_easy *easy, void **to,
+                                 void *from);
+
+/*
+ * Curl_resolver_cancel().
+ *
+ * It is called from inside other functions to cancel currently performing
+ * resolver request. Should also free any temporary resources allocated to
+ * perform a request.  This never waits for resolver threads to complete.
+ *
+ * It is safe to call this when conn is in any state.
+ */
+void Curl_resolver_cancel(struct connectdata *conn);
+
+/*
+ * Curl_resolver_kill().
+ *
+ * This acts like Curl_resolver_cancel() except it will block until any threads
+ * associated with the resolver are complete.  This never blocks for resolvers
+ * that do not use threads.  This is intended to be the "last chance" function
+ * that cleans up an in-progress resolver completely (before its owner is about
+ * to die).
+ *
+ * It is safe to call this when conn is in any state.
+ */
+void Curl_resolver_kill(struct connectdata *conn);
+
+/* Curl_resolver_getsock()
+ *
+ * This function is called from the multi_getsock() function.  'sock' is a
+ * pointer to an array to hold the file descriptors, with 'numsock' being the
+ * size of that array (in number of entries). This function is supposed to
+ * return bitmask indicating what file descriptors (referring to array indexes
+ * in the 'sock' array) to wait for, read/write.
+ */
+int Curl_resolver_getsock(struct connectdata *conn, curl_socket_t *sock);
+
+/*
+ * Curl_resolver_is_resolved()
+ *
+ * Called repeatedly to check if a previous name resolve request has
+ * completed. It should also make sure to time-out if the operation seems to
+ * take too long.
+ *
+ * Returns normal CURLcode errors.
+ */
+CURLcode Curl_resolver_is_resolved(struct connectdata *conn,
+                                   struct Curl_dns_entry **dns);
+
+/*
+ * Curl_resolver_wait_resolv()
+ *
+ * Waits for a resolve to finish. This function should be avoided since using
+ * this risk getting the multi interface to "hang".
+ *
+ * If 'entry' is non-NULL, make it point to the resolved dns entry
+ *
+ * Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved,
+ * CURLE_OPERATION_TIMEDOUT if a time-out occurred, or other errors.
+ */
+CURLcode Curl_resolver_wait_resolv(struct connectdata *conn,
+                                   struct Curl_dns_entry **dnsentry);
+
+/*
+ * Curl_resolver_getaddrinfo() - when using this resolver
+ *
+ * Returns name information about the given hostname and port number. If
+ * successful, the 'hostent' is returned and the forth argument will point to
+ * memory we need to free after use. That memory *MUST* be freed with
+ * Curl_freeaddrinfo(), nothing else.
+ *
+ * Each resolver backend must of course make sure to return data in the
+ * correct format to comply with this.
+ */
+Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn,
+                                         const char *hostname,
+                                         int port,
+                                         int *waitp);
+
+#ifndef CURLRES_ASYNCH
+/* convert these functions if an asynch resolver isn't used */
+#define Curl_resolver_cancel(x) Curl_nop_stmt
+#define Curl_resolver_kill(x) Curl_nop_stmt
+#define Curl_resolver_is_resolved(x,y) CURLE_COULDNT_RESOLVE_HOST
+#define Curl_resolver_wait_resolv(x,y) CURLE_COULDNT_RESOLVE_HOST
+#define Curl_resolver_getsock(x,y,z) 0
+#define Curl_resolver_duphandle(x,y,z) CURLE_OK
+#define Curl_resolver_init(x,y) CURLE_OK
+#define Curl_resolver_global_init() CURLE_OK
+#define Curl_resolver_global_cleanup() Curl_nop_stmt
+#define Curl_resolver_cleanup(x) Curl_nop_stmt
+#endif
+
+#ifdef CURLRES_ASYNCH
+#define Curl_resolver_asynch() 1
+#else
+#define Curl_resolver_asynch() 0
+#endif
+
+
+/********** end of generic resolver interface functions *****************/
+#endif /* HEADER_CURL_ASYN_H */