Add a IPMI blob handler for SMBIOS tables

smbios-mdr has dependencies on intel-ipmi-oem which makes BIOS sending
SMBIOS tables to BMC through VGA shared memory. For platforms without
intel-ipmi-oem, implement a IPMI blob hanler so that BIOS can send
SMBIOS tables through IPMI blob interfaces.

Test:
Unit tests for the IPMI blob handler.
Manual test that transfers SMBIOS tables to BMC through IPMI blob
interfaces on a platform host.

Signed-off-by: Jie Yang <jjy@google.com>
Change-Id: I9bc1ae7e9bfaa793e47e38fa19049f0f69355189
diff --git a/src/smbios-ipmi-blobs/test/handler_unittest.hpp b/src/smbios-ipmi-blobs/test/handler_unittest.hpp
new file mode 100644
index 0000000..0b02a79
--- /dev/null
+++ b/src/smbios-ipmi-blobs/test/handler_unittest.hpp
@@ -0,0 +1,30 @@
+#pragma once
+
+#include "handler.hpp"
+
+#include <ipmid/api.h>
+#include <systemd/sd-bus.h>
+
+#include <gtest/gtest.h>
+
+sd_bus* ipmid_get_sd_bus_connection()
+{
+    return nullptr;
+}
+
+namespace blobs
+{
+
+class SmbiosBlobHandlerTest : public ::testing::Test
+{
+  protected:
+    SmbiosBlobHandlerTest() = default;
+
+    SmbiosBlobHandler handler;
+
+    const uint16_t session = 0;
+    const std::string expectedBlobId = "/smbios";
+    const std::vector<std::string> expectedBlobIdList = {"/smbios"};
+    const uint32_t handlerMaxBufferSize = 64 * 1024;
+};
+} // namespace blobs