From: Jacob Greenfield <jacob@jacobgreenfield.me>
Date: Tue, 18 Jul 2023 14:48:46 +0000 (-0400)
Subject: Save one byte on the frame epilogue
X-Git-Tag: v1.5.6^2~141
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=55ff3e4e17ea42a7c3726e51945c483a18d8c4c8;p=thirdparty%2Fzstd.git

Save one byte on the frame epilogue
---

diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 48cee4db7..209f3b0ee 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -5192,8 +5192,9 @@ static size_t ZSTD_writeEpilogue(ZSTD_CCtx* cctx, void* dst, size_t dstCapacity)
     if (cctx->stage != ZSTDcs_ending) {
         /* write one last empty block, make it the "last" block */
         U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1) + 0;
-        RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "no room for epilogue");
-        MEM_writeLE32(op, cBlockHeader24);
+        ZSTD_STATIC_ASSERT(ZSTD_BLOCKHEADERSIZE == 3);
+        RETURN_ERROR_IF(dstCapacity<3, dstSize_tooSmall, "no room for epilogue");
+        MEM_writeLE24(op, cBlockHeader24);
         op += ZSTD_blockHeaderSize;
         dstCapacity -= ZSTD_blockHeaderSize;
     }