lzx-compress.c: Simplify calculation of position footer

diff --git a/src/lzx-compress.c b/src/lzx-compress.c
index e1b65c7c18573bb721bd71ed6ab457a0892ca911..ba3b10aa1e7402bf62e2f4506591ce49590cbad7 100644 (file)
--- a/src/lzx-compress.c
+++ b/src/lzx-compress.c
@@ -962,8 +962,8 @@ lzx_tally_match(unsigned match_len, unsigned match_offset,
        /* The match offset shall be encoded as a position slot (itself encoded
         * as part of the main symbol) and a position footer.  */
        position_slot = lzx_get_position_slot(match_offset, queue);
-       position_footer = (match_offset + LZX_OFFSET_OFFSET) &
-                               ((1U << lzx_get_num_extra_bits(position_slot)) - 1);
+       position_footer = (match_offset + LZX_OFFSET_OFFSET) -
+                               lzx_position_base[position_slot];
 
        /* The match length shall be encoded as a length header (itself encoded
         * as part of the main symbol) and an optional length footer.  */