1 files changed, 86 insertions, 0 deletions
diff --git a/ipc/gtest/TestBigBuffer.cpp b/ipc/gtest/TestBigBuffer.cpp
new file mode 100644
index 0000000000..88c353d53d
--- /dev/null
+++ b/ipc/gtest/TestBigBuffer.cpp
@@ -0,0 +1,86 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "chrome/common/ipc_message.h"
+#include "chrome/common/ipc_message_utils.h"
+#include "gtest/gtest.h"
+
+#include "mozilla/RandomNum.h"
+#include "mozilla/ipc/BigBuffer.h"
+
+namespace mozilla::ipc {
+
+static bool SerializeAndDeserialize(BigBuffer&& aIn, BigBuffer* aOut) {
+  IPC::Message msg(MSG_ROUTING_NONE, 0);
+  {
+    IPC::MessageWriter writer(msg);
+    IPC::WriteParam(&writer, std::move(aIn));
+  }
+  EXPECT_EQ(aIn.Size(), 0u);
+
+  IPC::MessageReader reader(msg);
+  return IPC::ReadParam(&reader, aOut);
+}
+
+TEST(BigBuffer, Empty)
+{
+  BigBuffer in(0);
+  EXPECT_EQ(in.GetSharedMemory(), nullptr);
+  EXPECT_EQ(in.Size(), 0u);
+
+  BigBuffer out;
+  ASSERT_TRUE(SerializeAndDeserialize(std::move(in), &out));
+
+  EXPECT_EQ(in.GetSharedMemory(), nullptr);
+  EXPECT_EQ(in.Size(), 0u);
+  EXPECT_EQ(out.GetSharedMemory(), nullptr);
+  EXPECT_EQ(out.Size(), 0u);
+}
+
+TEST(BigBuffer, SmallSize)
+{
+  uint8_t data[]{1, 2, 3};
+  BigBuffer in{Span(data)};
+  EXPECT_EQ(in.GetSharedMemory(), nullptr);
+  EXPECT_EQ(in.Size(), 3u);
+
+  BigBuffer out;
+  ASSERT_TRUE(SerializeAndDeserialize(std::move(in), &out));
+
+  EXPECT_EQ(in.GetSharedMemory(), nullptr);
+  EXPECT_EQ(in.Size(), 0u);
+  EXPECT_EQ(out.GetSharedMemory(), nullptr);
+  EXPECT_EQ(out.Size(), 3u);
+
+  EXPECT_TRUE(out.AsSpan() == Span(data));
+}
+
+TEST(BigBuffer, BigSize)
+{
+  size_t size = BigBuffer::kShmemThreshold * 2;
+  // Generate a large block of random data which will be serialized in a shmem.
+  nsTArray<uint8_t> data(size);
+  for (size_t i = 0; i < size; ++i) {
+    data.AppendElement(mozilla::RandomUint64OrDie());
+  }
+  BigBuffer in{Span(data)};
+  EXPECT_NE(in.GetSharedMemory(), nullptr);
+  EXPECT_EQ(in.Size(), size);
+  EXPECT_EQ(in.GetSharedMemory()->memory(), in.Data());
+
+  BigBuffer out;
+  ASSERT_TRUE(SerializeAndDeserialize(std::move(in), &out));
+
+  EXPECT_EQ(in.GetSharedMemory(), nullptr);
+  EXPECT_EQ(in.Size(), 0u);
+  EXPECT_NE(out.GetSharedMemory(), nullptr);
+  EXPECT_EQ(out.Size(), size);
+  EXPECT_EQ(out.GetSharedMemory()->memory(), out.Data());
+
+  EXPECT_TRUE(out.AsSpan() == Span(data));
+}
+
+}  // namespace mozilla::ipc