--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/curl/docs/examples/http2-download.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,290 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  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.
+ *
+ ***************************************************************************/
+/* <DESC>
+ * Multiplexed HTTP/2 downloads over a single connection
+ * </DESC>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* somewhat unix-specific */
+#include <sys/time.h>
+#include <unistd.h>
+
+/* curl stuff */
+#include <curl/curl.h>
+
+#ifndef CURLPIPE_MULTIPLEX
+/* This little trick will just make sure that we don't enable pipelining for
+   libcurls old enough to not have this symbol. It is _not_ defined to zero in
+   a recent libcurl header. */
+#define CURLPIPE_MULTIPLEX 0
+#endif
+
+struct transfer {
+  CURL *easy;
+  unsigned int num;
+  FILE *out;
+};
+
+#define NUM_HANDLES 1000
+
+static
+void dump(const char *text, int num, unsigned char *ptr, size_t size,
+          char nohex)
+{
+  size_t i;
+  size_t c;
+
+  unsigned int width = 0x10;
+
+  if(nohex)
+    /* without the hex output, we can fit more on screen */
+    width = 0x40;
+
+  fprintf(stderr, "%d %s, %lu bytes (0x%lx)\n",
+          num, text, (unsigned long)size, (unsigned long)size);
+
+  for(i = 0; i<size; i += width) {
+
+    fprintf(stderr, "%4.4lx: ", (unsigned long)i);
+
+    if(!nohex) {
+      /* hex not disabled, show it */
+      for(c = 0; c < width; c++)
+        if(i + c < size)
+          fprintf(stderr, "%02x ", ptr[i + c]);
+        else
+          fputs("   ", stderr);
+    }
+
+    for(c = 0; (c < width) && (i + c < size); c++) {
+      /* check for 0D0A; if found, skip past and start a new line of output */
+      if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
+         ptr[i + c + 1] == 0x0A) {
+        i += (c + 2 - width);
+        break;
+      }
+      fprintf(stderr, "%c",
+              (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
+      /* check again for 0D0A, to avoid an extra \n if it's at width */
+      if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
+         ptr[i + c + 2] == 0x0A) {
+        i += (c + 3 - width);
+        break;
+      }
+    }
+    fputc('\n', stderr); /* newline */
+  }
+}
+
+static
+int my_trace(CURL *handle, curl_infotype type,
+             char *data, size_t size,
+             void *userp)
+{
+  const char *text;
+  struct transfer *t = (struct transfer *)userp;
+  unsigned int num = t->num;
+  (void)handle; /* prevent compiler warning */
+
+  switch(type) {
+  case CURLINFO_TEXT:
+    fprintf(stderr, "== %u Info: %s", num, data);
+    /* FALLTHROUGH */
+  default: /* in case a new one is introduced to shock us */
+    return 0;
+
+  case CURLINFO_HEADER_OUT:
+    text = "=> Send header";
+    break;
+  case CURLINFO_DATA_OUT:
+    text = "=> Send data";
+    break;
+  case CURLINFO_SSL_DATA_OUT:
+    text = "=> Send SSL data";
+    break;
+  case CURLINFO_HEADER_IN:
+    text = "<= Recv header";
+    break;
+  case CURLINFO_DATA_IN:
+    text = "<= Recv data";
+    break;
+  case CURLINFO_SSL_DATA_IN:
+    text = "<= Recv SSL data";
+    break;
+  }
+
+  dump(text, num, (unsigned char *)data, size, 1);
+  return 0;
+}
+
+static void setup(struct transfer *t, int num)
+{
+  char filename[128];
+  CURL *hnd;
+
+  hnd = t->easy = curl_easy_init();
+
+  snprintf(filename, 128, "dl-%d", num);
+
+  t->out = fopen(filename, "wb");
+
+  /* write to this file */
+  curl_easy_setopt(hnd, CURLOPT_WRITEDATA, t->out);
+
+  /* set the same URL */
+  curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
+
+  /* please be verbose */
+  curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
+  curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
+  curl_easy_setopt(hnd, CURLOPT_DEBUGDATA, t);
+
+  /* HTTP/2 please */
+  curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
+
+  /* we use a self-signed test server, skip verification during debugging */
+  curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
+  curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
+
+#if (CURLPIPE_MULTIPLEX > 0)
+  /* wait for pipe connection to confirm */
+  curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
+#endif
+}
+
+/*
+ * Download many transfers over HTTP/2, using the same connection!
+ */
+int main(int argc, char **argv)
+{
+  struct transfer trans[NUM_HANDLES];
+  CURLM *multi_handle;
+  int i;
+  int still_running = 0; /* keep number of running handles */
+  int num_transfers;
+  if(argc > 1) {
+    /* if given a number, do that many transfers */
+    num_transfers = atoi(argv[1]);
+    if((num_transfers < 1) || (num_transfers > NUM_HANDLES))
+      num_transfers = 3; /* a suitable low default */
+  }
+  else
+    num_transfers = 3; /* suitable default */
+
+  /* init a multi stack */
+  multi_handle = curl_multi_init();
+
+  for(i = 0; i < num_transfers; i++) {
+    setup(&trans[i], i);
+
+    /* add the individual transfer */
+    curl_multi_add_handle(multi_handle, trans[i].easy);
+  }
+
+  curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
+
+  /* we start some action by calling perform right away */
+  curl_multi_perform(multi_handle, &still_running);
+
+  while(still_running) {
+    struct timeval timeout;
+    int rc; /* select() return code */
+    CURLMcode mc; /* curl_multi_fdset() return code */
+
+    fd_set fdread;
+    fd_set fdwrite;
+    fd_set fdexcep;
+    int maxfd = -1;
+
+    long curl_timeo = -1;
+
+    FD_ZERO(&fdread);
+    FD_ZERO(&fdwrite);
+    FD_ZERO(&fdexcep);
+
+    /* set a suitable timeout to play around with */
+    timeout.tv_sec = 1;
+    timeout.tv_usec = 0;
+
+    curl_multi_timeout(multi_handle, &curl_timeo);
+    if(curl_timeo >= 0) {
+      timeout.tv_sec = curl_timeo / 1000;
+      if(timeout.tv_sec > 1)
+        timeout.tv_sec = 1;
+      else
+        timeout.tv_usec = (curl_timeo % 1000) * 1000;
+    }
+
+    /* get file descriptors from the transfers */
+    mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
+
+    if(mc != CURLM_OK) {
+      fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
+      break;
+    }
+
+    /* On success the value of maxfd is guaranteed to be >= -1. We call
+       select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
+       no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
+       to sleep 100ms, which is the minimum suggested value in the
+       curl_multi_fdset() doc. */
+
+    if(maxfd == -1) {
+#ifdef _WIN32
+      Sleep(100);
+      rc = 0;
+#else
+      /* Portable sleep for platforms other than Windows. */
+      struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
+      rc = select(0, NULL, NULL, NULL, &wait);
+#endif
+    }
+    else {
+      /* Note that on some platforms 'timeout' may be modified by select().
+         If you need access to the original value save a copy beforehand. */
+      rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
+    }
+
+    switch(rc) {
+    case -1:
+      /* select error */
+      break;
+    case 0:
+    default:
+      /* timeout or readable/writable sockets */
+      curl_multi_perform(multi_handle, &still_running);
+      break;
+    }
+  }
+
+  for(i = 0; i < num_transfers; i++) {
+    curl_multi_remove_handle(multi_handle, trans[i].easy);
+    curl_easy_cleanup(trans[i].easy);
+  }
+
+  curl_multi_cleanup(multi_handle);
+
+  return 0;
+}