--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/if2ip.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,243 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  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"
+
+#ifdef HAVE_NETINET_IN_H
+#  include <netinet/in.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#  include <arpa/inet.h>
+#endif
+#ifdef HAVE_NET_IF_H
+#  include <net/if.h>
+#endif
+#ifdef HAVE_SYS_IOCTL_H
+#  include <sys/ioctl.h>
+#endif
+#ifdef HAVE_NETDB_H
+#  include <netdb.h>
+#endif
+#ifdef HAVE_SYS_SOCKIO_H
+#  include <sys/sockio.h>
+#endif
+#ifdef HAVE_IFADDRS_H
+#  include <ifaddrs.h>
+#endif
+#ifdef HAVE_STROPTS_H
+#  include <stropts.h>
+#endif
+#ifdef __VMS
+#  include <inet.h>
+#endif
+
+#include "inet_ntop.h"
+#include "strcase.h"
+#include "if2ip.h"
+/* The last 3 #include files should be in this order */
+#include "curl_printf.h"
+#include "curl_memory.h"
+#include "memdebug.h"
+
+/* ------------------------------------------------------------------ */
+
+/* Return the scope of the given address. */
+unsigned int Curl_ipv6_scope(const struct sockaddr *sa)
+{
+#ifndef ENABLE_IPV6
+  (void) sa;
+#else
+  if(sa->sa_family == AF_INET6) {
+    const struct sockaddr_in6 * sa6 = (const struct sockaddr_in6 *)(void *) sa;
+    const unsigned char *b = sa6->sin6_addr.s6_addr;
+    unsigned short w = (unsigned short) ((b[0] << 8) | b[1]);
+
+    if((b[0] & 0xFE) == 0xFC) /* Handle ULAs */
+      return IPV6_SCOPE_UNIQUELOCAL;
+    switch(w & 0xFFC0) {
+    case 0xFE80:
+      return IPV6_SCOPE_LINKLOCAL;
+    case 0xFEC0:
+      return IPV6_SCOPE_SITELOCAL;
+    case 0x0000:
+      w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] |
+          b[10] | b[11] | b[12] | b[13] | b[14];
+      if(w || b[15] != 0x01)
+        break;
+      return IPV6_SCOPE_NODELOCAL;
+    default:
+      break;
+    }
+  }
+#endif
+
+  return IPV6_SCOPE_GLOBAL;
+}
+
+
+#if defined(HAVE_GETIFADDRS)
+
+if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
+                          unsigned int local_scope_id, const char *interf,
+                          char *buf, int buf_size)
+{
+  struct ifaddrs *iface, *head;
+  if2ip_result_t res = IF2IP_NOT_FOUND;
+
+#ifndef ENABLE_IPV6
+  (void) remote_scope;
+#endif
+
+#if !defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID) || \
+    !defined(ENABLE_IPV6)
+  (void) local_scope_id;
+#endif
+
+  if(getifaddrs(&head) >= 0) {
+    for(iface = head; iface != NULL; iface = iface->ifa_next) {
+      if(iface->ifa_addr != NULL) {
+        if(iface->ifa_addr->sa_family == af) {
+          if(strcasecompare(iface->ifa_name, interf)) {
+            void *addr;
+            char *ip;
+            char scope[12] = "";
+            char ipstr[64];
+#ifdef ENABLE_IPV6
+            if(af == AF_INET6) {
+#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
+              unsigned int scopeid = 0;
+#endif
+              unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr);
+
+              if(ifscope != remote_scope) {
+                /* We are interested only in interface addresses whose
+                   scope matches the remote address we want to
+                   connect to: global for global, link-local for
+                   link-local, etc... */
+                if(res == IF2IP_NOT_FOUND) res = IF2IP_AF_NOT_SUPPORTED;
+                continue;
+              }
+
+              addr =
+                &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr;
+#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
+              /* Include the scope of this interface as part of the address */
+              scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr)
+                            ->sin6_scope_id;
+
+              /* If given, scope id should match. */
+              if(local_scope_id && scopeid != local_scope_id) {
+                if(res == IF2IP_NOT_FOUND)
+                  res = IF2IP_AF_NOT_SUPPORTED;
+
+                continue;
+              }
+
+              if(scopeid)
+                  msnprintf(scope, sizeof(scope), "%%%u", scopeid);
+#endif
+            }
+            else
+#endif
+              addr =
+                  &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr;
+            res = IF2IP_FOUND;
+            ip = (char *) Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr));
+            msnprintf(buf, buf_size, "%s%s", ip, scope);
+            break;
+          }
+        }
+        else if((res == IF2IP_NOT_FOUND) &&
+                strcasecompare(iface->ifa_name, interf)) {
+          res = IF2IP_AF_NOT_SUPPORTED;
+        }
+      }
+    }
+
+    freeifaddrs(head);
+  }
+
+  return res;
+}
+
+#elif defined(HAVE_IOCTL_SIOCGIFADDR)
+
+if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
+                          unsigned int local_scope_id, const char *interf,
+                          char *buf, int buf_size)
+{
+  struct ifreq req;
+  struct in_addr in;
+  struct sockaddr_in *s;
+  curl_socket_t dummy;
+  size_t len;
+
+  (void)remote_scope;
+  (void)local_scope_id;
+
+  if(!interf || (af != AF_INET))
+    return IF2IP_NOT_FOUND;
+
+  len = strlen(interf);
+  if(len >= sizeof(req.ifr_name))
+    return IF2IP_NOT_FOUND;
+
+  dummy = socket(AF_INET, SOCK_STREAM, 0);
+  if(CURL_SOCKET_BAD == dummy)
+    return IF2IP_NOT_FOUND;
+
+  memset(&req, 0, sizeof(req));
+  memcpy(req.ifr_name, interf, len + 1);
+  req.ifr_addr.sa_family = AF_INET;
+
+  if(ioctl(dummy, SIOCGIFADDR, &req) < 0) {
+    sclose(dummy);
+    /* With SIOCGIFADDR, we cannot tell the difference between an interface
+       that does not exist and an interface that has no address of the
+       correct family. Assume the interface does not exist */
+    return IF2IP_NOT_FOUND;
+  }
+
+  s = (struct sockaddr_in *)(void *)&req.ifr_addr;
+  memcpy(&in, &s->sin_addr, sizeof(in));
+  Curl_inet_ntop(s->sin_family, &in, buf, buf_size);
+
+  sclose(dummy);
+  return IF2IP_FOUND;
+}
+
+#else
+
+if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope,
+                          unsigned int local_scope_id, const char *interf,
+                          char *buf, int buf_size)
+{
+    (void) af;
+    (void) remote_scope;
+    (void) local_scope_id;
+    (void) interf;
+    (void) buf;
+    (void) buf_size;
+    return IF2IP_NOT_FOUND;
+}
+
+#endif