From 5eff91e2143bf25ad8fb31aa2485b87cb05a07ed Mon Sep 17 00:00:00 2001
From: Bradley White <14679271+devbww@users.noreply.github.com>
Date: Wed, 8 Feb 2023 04:18:17 -0500
Subject: [PATCH] cleanup: cater to platforms with 32-bit std::streamsize

Explicitly cast a 64-bit value to `std::streamsize`.  This is
safe because the value being cast is bounded by another value
that originated as a `std::streamsize`.

Part of #10775.
---
 .../benchmarks/aggregate_upload_throughput_benchmark.cc       | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/google/cloud/storage/benchmarks/aggregate_upload_throughput_benchmark.cc b/google/cloud/storage/benchmarks/aggregate_upload_throughput_benchmark.cc
index 5cceb060414..10040013dcc 100644
--- a/google/cloud/storage/benchmarks/aggregate_upload_throughput_benchmark.cc
+++ b/google/cloud/storage/benchmarks/aggregate_upload_throughput_benchmark.cc
@@ -320,7 +320,9 @@ UploadDetail UploadOneObject(gcs::Client& client,
   while (object_bytes < upload.object_size) {
     auto n = std::min(static_cast<std::uint64_t>(buffer_size),
                       upload.object_size - object_bytes);
-    if (!stream.write(write_block.data(), n)) break;
+    if (!stream.write(write_block.data(), static_cast<std::streamsize>(n))) {
+      break;
+    }
     object_bytes += n;
   }
   stream.Close();