piece-table: optimization: grow piece when possible

1 files changed, 13 insertions, 0 deletions

diff --git a/src/piece-table.c b/src/piece-table.c
index c6e2375..ba88103 100644
--- a/src/piece-table.c
+++ b/src/piece-table.c
@@ -280,6 +280,19 @@ piece_table_insert (piece_table *pt, size_t pos, char *in, size_t len)
       pt->cached_offset -= pt->cached->length;
     }
 
+  /* Optimization!
+   * Add in the end of the buffer, and the end of the piece: enlarge
+   */
+  if ( pt->add.len != 0 &&
+       start->buffer == &pt->add &&
+       pt->cached_offset + start->length == pos &&
+       pt->add.len == start->start + start->length ) {
+      pt->length += len;
+      start->length += len;
+      return;
+  }
+
+
   /* Make a new piece and insert it */
   new = piece_buffer_bump(pt->pieces);
   new->buffer = &pt->add;