--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/docs/examples/smtp-tls.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,171 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2016, 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.
+ *
+ ***************************************************************************/
+
+/* <DESC>
+ * SMTP example using TLS
+ * </DESC>
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <curl/curl.h>
+
+/* This is a simple example showing how to send mail using libcurl's SMTP
+ * capabilities. It builds on the smtp-mail.c example to add authentication
+ * and, more importantly, transport security to protect the authentication
+ * details from being snooped.
+ *
+ * Note that this example requires libcurl 7.20.0 or above.
+ */
+
+#define FROM    "<sender@example.org>"
+#define TO      "<addressee@example.net>"
+#define CC      "<info@example.org>"
+
+static const char *payload_text[] = {
+  "Date: Mon, 29 Nov 2010 21:54:29 +1100\r\n",
+  "To: " TO "\r\n",
+  "From: " FROM " (Example User)\r\n",
+  "Cc: " CC " (Another example User)\r\n",
+  "Message-ID: <dcd7cb36-11db-487a-9f3a-e652a9458efd@"
+  "rfcpedant.example.org>\r\n",
+  "Subject: SMTP TLS example message\r\n",
+  "\r\n", /* empty line to divide headers from body, see RFC5322 */
+  "The body of the message starts here.\r\n",
+  "\r\n",
+  "It could be a lot of lines, could be MIME encoded, whatever.\r\n",
+  "Check RFC5322.\r\n",
+  NULL
+};
+
+struct upload_status {
+  int lines_read;
+};
+
+static size_t payload_source(void *ptr, size_t size, size_t nmemb, void *userp)
+{
+  struct upload_status *upload_ctx = (struct upload_status *)userp;
+  const char *data;
+
+  if((size == 0) || (nmemb == 0) || ((size*nmemb) < 1)) {
+    return 0;
+  }
+
+  data = payload_text[upload_ctx->lines_read];
+
+  if(data) {
+    size_t len = strlen(data);
+    memcpy(ptr, data, len);
+    upload_ctx->lines_read++;
+
+    return len;
+  }
+
+  return 0;
+}
+
+int main(void)
+{
+  CURL *curl;
+  CURLcode res = CURLE_OK;
+  struct curl_slist *recipients = NULL;
+  struct upload_status upload_ctx;
+
+  upload_ctx.lines_read = 0;
+
+  curl = curl_easy_init();
+  if(curl) {
+    /* Set username and password */
+    curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
+    curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");
+
+    /* This is the URL for your mailserver. Note the use of port 587 here,
+     * instead of the normal SMTP port (25). Port 587 is commonly used for
+     * secure mail submission (see RFC4403), but you should use whatever
+     * matches your server configuration. */
+    curl_easy_setopt(curl, CURLOPT_URL, "smtp://mainserver.example.net:587");
+
+    /* In this example, we'll start with a plain text connection, and upgrade
+     * to Transport Layer Security (TLS) using the STARTTLS command. Be careful
+     * of using CURLUSESSL_TRY here, because if TLS upgrade fails, the transfer
+     * will continue anyway - see the security discussion in the libcurl
+     * tutorial for more details. */
+    curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_ALL);
+
+    /* If your server doesn't have a valid certificate, then you can disable
+     * part of the Transport Layer Security protection by setting the
+     * CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST options to 0 (false).
+     *   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
+     *   curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
+     * That is, in general, a bad idea. It is still better than sending your
+     * authentication details in plain text though.  Instead, you should get
+     * the issuer certificate (or the host certificate if the certificate is
+     * self-signed) and add it to the set of certificates that are known to
+     * libcurl using CURLOPT_CAINFO and/or CURLOPT_CAPATH. See docs/SSLCERTS
+     * for more information. */
+    curl_easy_setopt(curl, CURLOPT_CAINFO, "/path/to/certificate.pem");
+
+    /* Note that this option isn't strictly required, omitting it will result
+     * in libcurl sending the MAIL FROM command with empty sender data. All
+     * autoresponses should have an empty reverse-path, and should be directed
+     * to the address in the reverse-path which triggered them. Otherwise,
+     * they could cause an endless loop. See RFC 5321 Section 4.5.5 for more
+     * details.
+     */
+    curl_easy_setopt(curl, CURLOPT_MAIL_FROM, FROM);
+
+    /* Add two recipients, in this particular case they correspond to the
+     * To: and Cc: addressees in the header, but they could be any kind of
+     * recipient. */
+    recipients = curl_slist_append(recipients, TO);
+    recipients = curl_slist_append(recipients, CC);
+    curl_easy_setopt(curl, CURLOPT_MAIL_RCPT, recipients);
+
+    /* We're using a callback function to specify the payload (the headers and
+     * body of the message). You could just use the CURLOPT_READDATA option to
+     * specify a FILE pointer to read from. */
+    curl_easy_setopt(curl, CURLOPT_READFUNCTION, payload_source);
+    curl_easy_setopt(curl, CURLOPT_READDATA, &upload_ctx);
+    curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
+
+    /* Since the traffic will be encrypted, it is very useful to turn on debug
+     * information within libcurl to see what is happening during the transfer.
+     */
+    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+
+    /* Send the message */
+    res = curl_easy_perform(curl);
+
+    /* Check for errors */
+    if(res != CURLE_OK)
+      fprintf(stderr, "curl_easy_perform() failed: %s\n",
+              curl_easy_strerror(res));
+
+    /* Free the list of recipients */
+    curl_slist_free_all(recipients);
+
+    /* Always cleanup */
+    curl_easy_cleanup(curl);
+  }
+
+  return (int)res;
+}