1 files changed, 24 insertions, 3 deletions

diff --git a/xdelta3/xdelta3-main.h b/xdelta3/xdelta3-main.h
index 6be82dc..23133a3 100644
--- a/xdelta3/xdelta3-main.h
+++ b/xdelta3/xdelta3-main.h
@@ -1138,7 +1138,12 @@ main_print_window (xd3_stream* stream, main_file *xfile)
 
   while (stream->inst_sect.buf < stream->inst_sect.buf_max)
     {
-      uint   code = stream->inst_sect.buf[0];
+      uint code = stream->inst_sect.buf[0];
+      const uint8_t *addr_before = stream->addr_sect.buf;
+      const uint8_t *inst_before = stream->inst_sect.buf;
+      usize_t addr_bytes;
+      usize_t inst_bytes;
+      usize_t size_before = size;
 
       if ((ret = xd3_decode_instruction (stream)))
         {
@@ -1147,13 +1152,15 @@ main_print_window (xd3_stream* stream, main_file *xfile)
           return ret;
         }
 
+      addr_bytes = stream->addr_sect.buf - addr_before;
+      inst_bytes = stream->inst_sect.buf - inst_before;
+
       VC(UT "  %06"Q"u %03u  %s %3u", stream->dec_winstart + size, code,
          xd3_rtype_to_string (stream->dec_current1.type, option_print_cpymode),
          (usize_t) stream->dec_current1.size)VE;
 
       if (stream->dec_current1.type != XD3_NOOP)
         {
-          size += stream->dec_current1.size;
           if (stream->dec_current1.type >= XD3_CPY)
             {
               VC(UT " @%-6u", (usize_t)stream->dec_current1.addr)VE;
@@ -1162,11 +1169,12 @@ main_print_window (xd3_stream* stream, main_file *xfile)
             {
               VC(UT "        ")VE;
             }
+
+          size += stream->dec_current1.size;
         }
 
       if (stream->dec_current2.type != XD3_NOOP)
         {
-          size += stream->dec_current2.size;
           VC(UT "  %s %3u",
              xd3_rtype_to_string (stream->dec_current2.type,
                                   option_print_cpymode),
@@ -1176,9 +1184,22 @@ main_print_window (xd3_stream* stream, main_file *xfile)
             {
               VC(UT " @%-6u", (usize_t)stream->dec_current2.addr)VE;
             }
+
+          size += stream->dec_current2.size;
         }
 
       VC(UT "\n")VE;
+
+      if (option_verbose &&
+          addr_bytes + inst_bytes >= (size - size_before) &&
+          (stream->dec_current1.type >= XD3_CPY ||
+           stream->dec_current2.type >= XD3_CPY))
+        {
+          VC(UT "  %06"Q"u (inefficiency) %u encoded as %u bytes\n",
+             stream->dec_winstart + size_before,
+             size - size_before,
+             addr_bytes + inst_bytes)VE;
+        }
     }
 
   if (stream->dec_tgtlen != size && (stream->flags & XD3_SKIP_WINDOW) == 0)