From 17d1176f26fb679602b990e8194bf21a1c92d005 Mon Sep 17 00:00:00 2001
From: "Evgeny Grin (Karlson2k)" <k2k@narod.ru>
Date: Tue, 9 May 2017 21:37:44 +0300
Subject: Added internal function for finding token in request headers

---
 src/microhttpd/connection.c | 51 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/src/microhttpd/connection.c b/src/microhttpd/connection.c
index 8c91f468..6c7d5226 100644
--- a/src/microhttpd/connection.c
+++ b/src/microhttpd/connection.c
@@ -467,6 +467,57 @@ MHD_lookup_connection_value (struct MHD_Connection *connection,
 }
 
 
+/**
+ * Check whether request header contains particular token.
+ *
+ * Token could be surrounded by spaces and tabs and delimited by comma.
+ * Case-insensitive match used for header names and tokens.
+ * @param connection the connection to get values from
+ * @param header     the header name
+ * @param token      the token to find
+ * @param token_len  the length of token, not including optional
+ *                   terminating null-character.
+ * @return true if token is found in specified header,
+ *         false otherwise
+ */
+static bool
+MHD_lookup_header_token_ci (const struct MHD_Connection *connection,
+                         const char *header,
+                         const char *token,
+                         size_t token_len)
+{
+  struct MHD_HTTP_Header *pos;
+
+  if (NULL == connection || NULL == header || 0 == header[0] || NULL == token || 0 == token[0])
+    return false;
+  for (pos = connection->headers_received; NULL != pos; pos = pos->next)
+    {
+      if ((0 != (pos->kind & MHD_HEADER_KIND)) &&
+          ( (header == pos->header) ||
+            (MHD_str_equal_caseless_(header,
+                                      pos->header)) ) &&
+          (MHD_str_has_token_caseless_ (pos->value, token, token_len)))
+        return true;
+    }
+  return false;
+}
+
+
+/**
+ * Check whether request header contains particular static @a tkn.
+ *
+ * Token could be surrounded by spaces and tabs and delimited by comma.
+ * Case-insensitive match used for header names and tokens.
+ * @param c   the connection to get values from
+ * @param h   the header name
+ * @param tkn the static string of token to find
+ * @return true if token is found in specified header,
+ *         false otherwise
+ */
+#define MHD_lookup_header_s_token_ci(c,h,tkn) \
+    MHD_lookup_header_token_ci((c),(h),(tkn),MHD_STATICSTR_LEN_(tkn))
+
+
 /**
  * Do we (still) need to send a 100 continue
  * message for this connection?
-- 
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