From: senhuang42 <senhuang96@fb.com>
Date: Mon, 19 Oct 2020 14:52:41 +0000 (-0400)
Subject: Add unit test for no cctx requested params change
X-Git-Tag: v1.4.7~44^2~5
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df470e176bdd4240a18997f4cf57e100c0ac6755;p=thirdparty%2Fzstd.git

Add unit test for no cctx requested params change
---

diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index 302bfaf62..8c310f3d4 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -1196,6 +1196,26 @@ static int basicUnitTests(U32 const seed, double compressibility)
     }
     DISPLAYLEVEL(3, "OK \n");
 
+    DISPLAYLEVEL(3, "test%3d : ldm conditionally enabled by default doesn't change cctx params: ", testNb++);
+    {   ZSTD_CCtx* const cctx = ZSTD_createCCtx();
+        ZSTD_outBuffer out = {NULL, 0, 0};
+        ZSTD_inBuffer in = {NULL, 0, 0};
+        int value;
+
+        /* Even if LDM will be enabled by default in the applied params (since wlog >= 27 and strategy >= btopt),
+         * we should not modify the actual parameter specified by the user within the CCtx
+         */
+        CHECK_Z(ZSTD_CCtx_setParameter(cctx, ZSTD_c_windowLog, 27));
+        CHECK_Z(ZSTD_CCtx_setParameter(cctx, ZSTD_c_strategy, ZSTD_btopt));
+
+        CHECK_Z(ZSTD_compressStream2(cctx, &out, &in, ZSTD_e_continue));
+        CHECK_Z(ZSTD_CCtx_getParameter(cctx, ZSTD_c_enableLongDistanceMatching, &value));
+        CHECK_EQ(value, 0);
+
+        ZSTD_freeCCtx(cctx);
+    }
+    DISPLAYLEVEL(3, "OK \n");
+
     /* this test is really too long, and should be made faster */
     DISPLAYLEVEL(3, "test%3d : overflow protection with large windowLog : ", testNb++);
     {   ZSTD_CCtx* const cctx = ZSTD_createCCtx();