t/helper: add a test helper to compute hash speed

diff --git a/patch-delta.c b/patch-delta.c
index 283fb4b7591a179c9e248ec3d9ac8ac47f3a4c9f..b5c8594db60dd19fbe18b95ea79439c7bad3fa40 100644 (file)
--- a/patch-delta.c
+++ b/patch-delta.c
@@ -40,13 +40,20 @@ void *patch_delta(const void *src_buf, unsigned long src_size,
                cmd = *data++;
                if (cmd & 0x80) {
                        unsigned long cp_off = 0, cp_size = 0;
-                       if (cmd & 0x01) cp_off = *data++;
-                       if (cmd & 0x02) cp_off |= (*data++ << 8);
-                       if (cmd & 0x04) cp_off |= (*data++ << 16);
-                       if (cmd & 0x08) cp_off |= ((unsigned) *data++ << 24);
-                       if (cmd & 0x10) cp_size = *data++;
-                       if (cmd & 0x20) cp_size |= (*data++ << 8);
-                       if (cmd & 0x40) cp_size |= (*data++ << 16);
+#define PARSE_CP_PARAM(bit, var, shift) do { \
+                       if (cmd & (bit)) { \
+                               if (data >= top) \
+                                       goto bad_length; \
+                               var |= ((unsigned) *data++ << (shift)); \
+                       } } while (0)
+                       PARSE_CP_PARAM(0x01, cp_off, 0);
+                       PARSE_CP_PARAM(0x02, cp_off, 8);
+                       PARSE_CP_PARAM(0x04, cp_off, 16);
+                       PARSE_CP_PARAM(0x08, cp_off, 24);
+                       PARSE_CP_PARAM(0x10, cp_size, 0);
+                       PARSE_CP_PARAM(0x20, cp_size, 8);
+                       PARSE_CP_PARAM(0x40, cp_size, 16);
+#undef PARSE_CP_PARAM
                        if (cp_size == 0) cp_size = 0x10000;
                        if (unsigned_add_overflows(cp_off, cp_size) ||
                            cp_off + cp_size > src_size ||