Add MinidumpMemoryWriter, MinidumpMemoryListWriter, and their test

minidump/minidump_file_writer_test.cc

Index: minidump/minidump_file_writer_test.cc
diff --git a/minidump/minidump_file_writer_test.cc b/minidump/minidump_file_writer_test.cc
index a2aa4d04ab955123f2713d7b4eb888734a79923e..0455548b8a14598e11dae2b8c915bb4e6e394fe4 100644
--- a/minidump/minidump_file_writer_test.cc
+++ b/minidump/minidump_file_writer_test.cc
@@ -217,6 +217,43 @@ TEST(MinidumpFileWriter, ThreeStreams) {
   EXPECT_EQ(0, memcmp(stream3_data, expected_stream3.c_str(), kStream3Size));
 }
 
+TEST(MinidumpFileWriter, ZeroLengthStream) {
+  MinidumpFileWriter minidump_file;
+
+  const size_t kStreamSize = 0;
+  const MinidumpStreamType kStreamType = static_cast<MinidumpStreamType>(0x4d);
+  TestStream stream(kStreamType, kStreamSize, 0);
+  minidump_file.AddStream(&stream);
+
+  StringFileWriter file_writer;
+  ASSERT_TRUE(minidump_file.WriteEverything(&file_writer));
+
+  const size_t kDirectoryOffset = sizeof(MINIDUMP_HEADER);
+  const size_t kStreamOffset = kDirectoryOffset + sizeof(MINIDUMP_DIRECTORY);
+  const size_t kFileSize = kStreamOffset + kStreamSize;
+
+  ASSERT_EQ(kFileSize, file_writer.string().size());
+
+  const MINIDUMP_HEADER* header =
+      reinterpret_cast<const MINIDUMP_HEADER*>(&file_writer.string()[0]);
+
+  EXPECT_EQ(static_cast<uint32_t>(MINIDUMP_SIGNATURE), header->Signature);
+  EXPECT_EQ(static_cast<uint32_t>(MINIDUMP_VERSION), header->Version);
+  EXPECT_EQ(1u, header->NumberOfStreams);
+  EXPECT_EQ(kDirectoryOffset, header->StreamDirectoryRva);
+  EXPECT_EQ(0u, header->CheckSum);
+  EXPECT_EQ(0u, header->TimeDateStamp);
+  EXPECT_EQ(MiniDumpNormal, header->Flags);
+
+  const MINIDUMP_DIRECTORY* directory =
+      reinterpret_cast<const MINIDUMP_DIRECTORY*>(
+          &file_writer.string()[kDirectoryOffset]);
+
+  EXPECT_EQ(kStreamType, directory->StreamType);
+  EXPECT_EQ(kStreamSize, directory->Location.DataSize);
+  EXPECT_EQ(kStreamOffset, directory->Location.Rva);
+}
+
 TEST(MinidumpFileWriterDeathTest, SameStreamType) {
   MinidumpFileWriter minidump_file;