firmware: add read/write configuration methods

A data handler may require the host-side client to read or write
configuration information.  Therefore, implement a method for
controlling this in the data handler object.

Change-Id: Id7f8ff54d90cece2e8751773a8696638c2a2ea77
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/test/firmware_writemeta_unittest.cpp b/test/firmware_writemeta_unittest.cpp
new file mode 100644
index 0000000..0a795c9
--- /dev/null
+++ b/test/firmware_writemeta_unittest.cpp
@@ -0,0 +1,69 @@
+#include "data_mock.hpp"
+#include "firmware_handler.hpp"
+#include "image_mock.hpp"
+
+#include <gtest/gtest.h>
+
+namespace blobs
+{
+using ::testing::Eq;
+using ::testing::Return;
+
+TEST(FirmwareHandlerWriteMetaTest, WriteConfigParametersFailIfOverIPMI)
+{
+    ImageHandlerMock imageMock1, imageMock2;
+    std::vector<HandlerPack> blobs = {
+        {FirmwareBlobHandler::hashBlobID, &imageMock1},
+        {"asdf", &imageMock2},
+    };
+
+    DataHandlerMock dataMock;
+
+    std::vector<DataHandlerPack> data = {
+        {FirmwareBlobHandler::FirmwareUpdateFlags::ipmi, nullptr},
+        {FirmwareBlobHandler::FirmwareUpdateFlags::lpc, &dataMock},
+    };
+
+    auto handler = FirmwareBlobHandler::CreateFirmwareBlobHandler(blobs, data);
+
+    EXPECT_CALL(imageMock2, open("asdf")).WillOnce(Return(true));
+
+    EXPECT_TRUE(handler->open(
+        0, OpenFlags::write | FirmwareBlobHandler::FirmwareUpdateFlags::ipmi,
+        "asdf"));
+
+    std::vector<std::uint8_t> bytes = {0xaa, 0x55};
+
+    EXPECT_FALSE(handler->writeMeta(0, 0, bytes));
+}
+
+TEST(FirmwareHandlerWriteMetaTest, WriteConfigParametersPassedThrough)
+{
+    ImageHandlerMock imageMock1, imageMock2;
+    std::vector<HandlerPack> blobs = {
+        {FirmwareBlobHandler::hashBlobID, &imageMock1},
+        {"asdf", &imageMock2},
+    };
+
+    DataHandlerMock dataMock;
+
+    std::vector<DataHandlerPack> data = {
+        {FirmwareBlobHandler::FirmwareUpdateFlags::ipmi, nullptr},
+        {FirmwareBlobHandler::FirmwareUpdateFlags::lpc, &dataMock},
+    };
+
+    auto handler = FirmwareBlobHandler::CreateFirmwareBlobHandler(blobs, data);
+
+    EXPECT_CALL(imageMock2, open("asdf")).WillOnce(Return(true));
+
+    EXPECT_TRUE(handler->open(
+        0, OpenFlags::write | FirmwareBlobHandler::FirmwareUpdateFlags::lpc,
+        "asdf"));
+
+    std::vector<std::uint8_t> bytes = {0x01, 0x02, 0x03, 0x04};
+
+    EXPECT_CALL(dataMock, write(Eq(bytes))).WillOnce(Return(true));
+    EXPECT_TRUE(handler->writeMeta(0, 0, bytes));
+}
+
+} // namespace blobs