From b06710889ff77ad10ced072232b1e4fa16468a20 Mon Sep 17 00:00:00 2001
From: Bimba Shrestha <bimbashrestha@fb.com>
Date: Thu, 18 Jun 2020 09:31:06 -0700
Subject: [PATCH] error when not using --stream-size on pipe

---
 programs/fileio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/programs/fileio.c b/programs/fileio.c
index 390e8def5..5e9d622f9 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -772,6 +772,8 @@ static void FIO_adjustMemLimitForPatchFromMode(FIO_prefs_t* const prefs,
 {
     unsigned long long maxSize = MAX(prefs->memLimit, MAX(dictSize, maxSrcFileSize));
     unsigned const maxWindowSize = (1U << ZSTD_WINDOWLOG_MAX);
+    if (maxSize == UTIL_FILESIZE_UNKNOWN)
+        EXM_THROW(42, "Using --patch-from with stdin requires --stream-size");
     assert(maxSize != UTIL_FILESIZE_UNKNOWN);
     if (maxSize > maxWindowSize)
         EXM_THROW(42, "Can't handle files larger than %u GB\n", maxWindowSize/(1 GB));
-- 
2.47.3