From: Yann Collet <cyan@fb.com>
Date: Fri, 20 Dec 2024 00:11:46 +0000 (-0800)
Subject: minor: use MEM_writeLE24()
X-Git-Tag: v1.5.7^2~48^2~4
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=522adc34eb83c9145dfe1be36412eefa642413e1;p=thirdparty%2Fzstd.git

minor: use MEM_writeLE24()

so that an empty frame needs only 3 bytes of dstCapacity.
---

diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index b5e88325d..fcd8035fa 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -7213,8 +7213,8 @@ ZSTD_compressSequencesAndLiterals_internal(ZSTD_CCtx* cctx,
     /* Special case: empty frame */
     if ((nbSequences == 1) && (inSeqs[0].litLength == 0)) {
         U32 const cBlockHeader24 = 1 /* last block */ + (((U32)bt_raw)<<1);
-        RETURN_ERROR_IF(dstCapacity<4, dstSize_tooSmall, "No room for empty frame block header");
-        MEM_writeLE32(op, cBlockHeader24);
+        RETURN_ERROR_IF(dstCapacity<3, dstSize_tooSmall, "No room for empty frame block header");
+        MEM_writeLE24(op, cBlockHeader24);
         op += ZSTD_blockHeaderSize;
         dstCapacity -= ZSTD_blockHeaderSize;
         cSize += ZSTD_blockHeaderSize;