From cd9ef2012c6147e23de880987e9aafafc5f21c27 Mon Sep 17 00:00:00 2001
From: "Brian P. Walenz" <thebri@gmail.com>
Date: Fri, 4 Sep 2020 15:07:58 -0400
Subject: [PATCH] Fail catastrophically if a read with no segment is requested;
 fix incorrect cast that would fail to load a read in a blob bigger than 4 GB.

---
 src/stores/sqStoreBlob.C | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/stores/sqStoreBlob.C b/src/stores/sqStoreBlob.C
index cb548d43e..61b566920 100644
--- a/src/stores/sqStoreBlob.C
+++ b/src/stores/sqStoreBlob.C
@@ -102,7 +102,9 @@ sqStoreBlobReader::~sqStoreBlobReader() {
 readBuffer *
 sqStoreBlobReader::getBuffer(sqReadMeta *meta) {
   uint32  file = meta->sqRead_mSegm();
-  uint32  posn = meta->sqRead_mByte();
+  uint64  posn = meta->sqRead_mByte();
+
+  assert(file > 0);
 
   while (_buffersMax <= file)
     resizeArray(_buffers, _buffersMax, _buffersMax, _buffersMax * 2, resizeArray_copyData | resizeArray_clearNew);