--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/lib/gopher.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,174 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  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"
+
+#ifndef CURL_DISABLE_GOPHER
+
+#include "urldata.h"
+#include <curl/curl.h>
+#include "transfer.h"
+#include "sendf.h"
+#include "progress.h"
+#include "gopher.h"
+#include "select.h"
+#include "strdup.h"
+#include "url.h"
+#include "escape.h"
+#include "warnless.h"
+#include "curl_printf.h"
+#include "curl_memory.h"
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/*
+ * Forward declarations.
+ */
+
+static CURLcode gopher_do(struct connectdata *conn, bool *done);
+
+/*
+ * Gopher protocol handler.
+ * This is also a nice simple template to build off for simple
+ * connect-command-download protocols.
+ */
+
+const struct Curl_handler Curl_handler_gopher = {
+  "GOPHER",                             /* scheme */
+  ZERO_NULL,                            /* setup_connection */
+  gopher_do,                            /* do_it */
+  ZERO_NULL,                            /* done */
+  ZERO_NULL,                            /* do_more */
+  ZERO_NULL,                            /* connect_it */
+  ZERO_NULL,                            /* connecting */
+  ZERO_NULL,                            /* doing */
+  ZERO_NULL,                            /* proto_getsock */
+  ZERO_NULL,                            /* doing_getsock */
+  ZERO_NULL,                            /* domore_getsock */
+  ZERO_NULL,                            /* perform_getsock */
+  ZERO_NULL,                            /* disconnect */
+  ZERO_NULL,                            /* readwrite */
+  ZERO_NULL,                            /* connection_check */
+  PORT_GOPHER,                          /* defport */
+  CURLPROTO_GOPHER,                     /* protocol */
+  PROTOPT_NONE                          /* flags */
+};
+
+static CURLcode gopher_do(struct connectdata *conn, bool *done)
+{
+  CURLcode result = CURLE_OK;
+  struct Curl_easy *data = conn->data;
+  curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
+  char *gopherpath;
+  char *path = data->state.up.path;
+  char *query = data->state.up.query;
+  char *sel = NULL;
+  char *sel_org = NULL;
+  ssize_t amount, k;
+  size_t len;
+
+  *done = TRUE; /* unconditionally */
+
+  /* path is guaranteed non-NULL */
+  DEBUGASSERT(path);
+
+  if(query)
+    gopherpath = aprintf("%s?%s", path, query);
+  else
+    gopherpath = strdup(path);
+
+  if(!gopherpath)
+    return CURLE_OUT_OF_MEMORY;
+
+  /* Create selector. Degenerate cases: / and /1 => convert to "" */
+  if(strlen(gopherpath) <= 2) {
+    sel = (char *)"";
+    len = strlen(sel);
+    free(gopherpath);
+  }
+  else {
+    char *newp;
+
+    /* Otherwise, drop / and the first character (i.e., item type) ... */
+    newp = gopherpath;
+    newp += 2;
+
+    /* ... and finally unescape */
+    result = Curl_urldecode(data, newp, 0, &sel, &len, FALSE);
+    free(gopherpath);
+    if(result)
+      return result;
+    sel_org = sel;
+  }
+
+  /* We use Curl_write instead of Curl_sendf to make sure the entire buffer is
+     sent, which could be sizeable with long selectors. */
+  k = curlx_uztosz(len);
+
+  for(;;) {
+    result = Curl_write(conn, sockfd, sel, k, &amount);
+    if(!result) { /* Which may not have written it all! */
+      result = Curl_client_write(conn, CLIENTWRITE_HEADER, sel, amount);
+      if(result)
+        break;
+
+      k -= amount;
+      sel += amount;
+      if(k < 1)
+        break; /* but it did write it all */
+    }
+    else
+      break;
+
+    /* Don't busyloop. The entire loop thing is a work-around as it causes a
+       BLOCKING behavior which is a NO-NO. This function should rather be
+       split up in a do and a doing piece where the pieces that aren't
+       possible to send now will be sent in the doing function repeatedly
+       until the entire request is sent.
+
+       Wait a while for the socket to be writable. Note that this doesn't
+       acknowledge the timeout.
+    */
+    if(SOCKET_WRITABLE(sockfd, 100) < 0) {
+      result = CURLE_SEND_ERROR;
+      break;
+    }
+  }
+
+  free(sel_org);
+
+  if(!result)
+    /* We can use Curl_sendf to send the terminal \r\n relatively safely and
+       save allocing another string/doing another _write loop. */
+    result = Curl_sendf(sockfd, conn, "\r\n");
+  if(result) {
+    failf(data, "Failed sending Gopher request");
+    return result;
+  }
+  result = Curl_client_write(conn, CLIENTWRITE_HEADER, (char *)"\r\n", 2);
+  if(result)
+    return result;
+
+  Curl_setup_transfer(data, FIRSTSOCKET, -1, FALSE, -1);
+  return CURLE_OK;
+}
+#endif /*CURL_DISABLE_GOPHER*/