upload android base code part6

android/system/tpm/trunks/tpm_handle.h

@@ -0,0 +1,63 @@
+//
+// Copyright (C) 2014 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#ifndef TRUNKS_TPM_HANDLE_H_
+#define TRUNKS_TPM_HANDLE_H_
+
+#include "trunks/command_transceiver.h"
+
+#include <string>
+
+#include "trunks/error_codes.h"
+
+namespace trunks {
+
+// Sends commands to a TPM device via a handle to /dev/tpm0. All commands are
+// sent synchronously. The SendCommand method is supported but does not return
+// until a response is received and the callback has been called. Command and
+// response data are opaque to this class; it performs no validation.
+//
+// Example:
+//   TpmHandle handle;
+//   if (!handle.Init()) {...}
+//   std::string response = handle.SendCommandAndWait(command);
+class TpmHandle : public CommandTransceiver {
+ public:
+  TpmHandle();
+  ~TpmHandle() override;
+
+  // Initializes a TpmHandle instance. This method must be called successfully
+  // before any other method. Returns true on success.
+  bool Init() override;
+
+  // CommandTranceiver methods.
+  void SendCommand(const std::string& command,
+                   const ResponseCallback& callback) override;
+  std::string SendCommandAndWait(const std::string& command) override;
+
+ private:
+  // Writes a |command| to /dev/tpm0 and reads the |response|. Returns
+  // TPM_RC_SUCCESS on success.
+  TPM_RC SendCommandInternal(const std::string& command, std::string* response);
+
+  int fd_;  // A file descriptor for /dev/tpm0.
+
+  DISALLOW_COPY_AND_ASSIGN(TpmHandle);
+};
+
+}  // namespace trunks
+
+#endif  // TRUNKS_TPM_HANDLE_H_