1 files changed, 46 insertions, 0 deletions
diff --git a/lib/http.c b/lib/http.c
index 0a3e46243..07665743c 100644
--- a/lib/http.c
+++ b/lib/http.c
@@ -1681,6 +1681,52 @@ enum proxy_use {
   HEADER_CONNECT  /* sending CONNECT to a proxy */
 };
 
+/* used to compile the provided trailers into one buffer
+   will return an error code if one of the headers is
+   not formatted correctly */
+CURLcode Curl_http_compile_trailers(struct curl_slist *trailers,
+                                    Curl_send_buffer *buffer,
+                                    struct Curl_easy *handle)
+{
+  char *ptr = NULL;
+  CURLcode result = CURLE_OK;
+  const char *endofline_native = NULL;
+  const char *endofline_network = NULL;
+
+  /* TODO: Maybe split Curl_add_custom_headers to make it reusable here */
+
+  if(
+#ifdef CURL_DO_LINEEND_CONV
+     (handle->set.prefer_ascii) ||
+#endif
+     (handle->set.crlf)) {
+    /* \n will become \r\n later on */
+    endofline_native  = "\n";
+    endofline_network = "\x0a";
+  }
+  else {
+    endofline_native  = "\r\n";
+    endofline_network = "\x0d\x0a";
+  }
+
+  while(trailers) {
+    /* only add correctly formatted trailers */
+    ptr = strchr(trailers->data, ':');
+    if(ptr && *(ptr + 1) == ' ') {
+      result = Curl_add_bufferf(&buffer, "%s%s", trailers->data,
+                                endofline_native);
+      if(result)
+        return result;
+    }
+    else
+      infof(handle, "Malformatted trailing header ! Skipping trailer.");
+    trailers = trailers->next;
+  }
+  result = Curl_add_buffer(&buffer, endofline_network,
+                           strlen(endofline_network));
+  return result;
+}
+
 CURLcode Curl_add_custom_headers(struct connectdata *conn,
                                  bool is_connect,
                                  Curl_send_buffer *req_buffer)