From: senhuang42 <senhuang96@fb.com>
Date: Sun, 27 Sep 2020 17:25:27 +0000 (-0400)
Subject: Add base adjustment correction
X-Git-Tag: v1.4.7~57^2~37
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f57c7e6bbfc1e61d92ba31d7ecf25d35744591d9;p=thirdparty%2Fzstd.git

Add base adjustment correction
---

diff --git a/lib/compress/zstd_ldm.c b/lib/compress/zstd_ldm.c
index 42e6aa2d8..5f44ce78a 100644
--- a/lib/compress/zstd_ldm.c
+++ b/lib/compress/zstd_ldm.c
@@ -579,8 +579,15 @@ size_t ZSTD_ldm_blockCompress(rawSeqStore_t* rawSeqStore,
     if (cParams->strategy >= ZSTD_btopt) {
         size_t lastLLSize;
         ms->ldmSeqStore = *rawSeqStore; /* copy current seqStore */
+        const BYTE* const prevBase = (BYTE const*)ms->window.base;
         lastLLSize = blockCompressor(ms, seqStore, rep, src, srcSize);
         rawSeqStore->pos = ms->ldmSeqStore.pos;
+        ms->ldmSeqStore = *rawSeqStore;
+        if (prevBase != ms->window.base) {
+            int baseDiff = (int)(prevBase - ms->window.base);
+            printf("Bases were different, adjusting, diff = %d\n", baseDiff);
+            rawSeqStore->seq[rawSeqStore->pos].litLength += baseDiff;
+        }
         return lastLLSize;
     }