From 7e0402e738f2e3ff6d74e63283bc7c514b67b3a4 Mon Sep 17 00:00:00 2001
From: "W. Felix Handte" <w@felixhandte.com>
Date: Tue, 15 May 2018 13:13:19 -0400
Subject: [PATCH] Also Attach Dict When Source Size is Unknown

---
 lib/compress/zstd_compress.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 9f488b9ac..4d4e171bc 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -1208,7 +1208,8 @@ static size_t ZSTD_resetCCtx_usingCDict(ZSTD_CCtx* cctx,
      * context, or referencing the dictionary context from the working context
      * in-place. We decide here which strategy to use. */
     /* TODO: pick reasonable cut-off size, handle ZSTD_CONTENTSIZE_UNKNOWN */
-    int attachDict = pledgedSrcSize <= 8 KB
+    int attachDict = ( pledgedSrcSize <= 8 KB
+                    || pledgedSrcSize == ZSTD_CONTENTSIZE_UNKNOWN )
                   && cdict->cParams.strategy == ZSTD_fast
                   && ZSTD_equivalentCParams(cctx->appliedParams.cParams,
                                             cdict->cParams);