From b29a31d36ad110afc87964f9e76f20b4657f9cfa Mon Sep 17 00:00:00 2001
From: Olivier Goffart <ogoffart@woboq.com>
Date: Wed, 2 Oct 2013 12:24:04 +0200
Subject: [PATCH] httpbf:  add a 'previous_etag' entry in that is sent in
 If-Match header

---
 src/httpbf/src/httpbf.c | 5 +++++
 src/httpbf/src/httpbf.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/src/httpbf/src/httpbf.c b/src/httpbf/src/httpbf.c
index f55e22717..0d4a81e04 100644
--- a/src/httpbf/src/httpbf.c
+++ b/src/httpbf/src/httpbf.c
@@ -124,6 +124,7 @@ Hbf_State hbf_splitlist(hbf_transfer_t *transfer, int fd ) {
   transfer->fd        = fd;
   transfer->stat_size = sb.st_size;
   transfer->modtime   = sb.st_mtime;
+  transfer->previous_etag = NULL;
 #ifndef NDEBUG
   transfer->calc_size = 0;
 #endif
@@ -482,6 +483,10 @@ Hbf_State hbf_transfer( ne_session *session, hbf_transfer_t *transfer, const cha
                     ne_add_request_header(req, "X-OC-Mtime", buf);
                 }
 
+                if( transfer->previous_etag ) {
+                  ne_add_request_header(req, "If-Match", transfer->previous_etag);
+                }
+
                 if( transfer->block_cnt > 1 ) {
                   ne_add_request_header(req, "OC-Chunked", "1");
                 }
diff --git a/src/httpbf/src/httpbf.h b/src/httpbf/src/httpbf.h
index 53066ba42..e00cc2531 100644
--- a/src/httpbf/src/httpbf.h
+++ b/src/httpbf/src/httpbf.h
@@ -98,6 +98,7 @@ struct hbf_transfer_s {
     hbf_abort_callback abort_cb;
     hbf_log_callback log_cb;
     int modtime_accepted;
+    const char *previous_etag; /* etag send as the If-Match http header */
 
 #ifndef NDEBUG
     int64_t calc_size;