V18.4.0 CAS plugin

Note that this version does not have Widevine Provisioning 4.0 support.
It is only suitable for device upgrades. A new patch with provisioning
4.0 support will be made later.

plugin/include/cas_status.h

@@ -0,0 +1,53 @@
+// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine Master
+// License Agreement.
+
+#ifndef CAS_STATUS_H
+#define CAS_STATUS_H
+
+#include <string>
+
+namespace wvcas {
+
+// TODO(jfore): Add more detailed error status codes.
+enum class CasStatusCode : int32_t {
+  kUnknownError = 0,
+  kNoError = 1,
+  kCryptoInterfaceError = 2,
+  kCryptoSessionError = 3,
+  kCasLicenseError = 4,
+  kIndividualizationError = 5,
+  kInvalidParameter = 6,
+  kDecryptionError = 7,
+  kKeyNotFound = 8,
+  kSessionNotFound = 9,
+  kUnknownLicenseType = 10,
+  kLicenseFileParseError = 11,
+  kInvalidLicenseFile = 12,
+  kInvalidPesData = 13,
+  kDeferedEcmProcessing = 14,
+  kAccessDeniedByParentalControl = 15,
+  kUnknownEvent = 16,
+  kOEMCryptoVersionMismatch = 17,
+};
+
+class CasStatus {
+ public:
+  CasStatus(CasStatusCode status = CasStatusCode::kNoError,
+            const std::string& err_string = std::string())
+      : status_(status), err_string_(err_string) {}
+  static CasStatus OkStatus() { return CasStatus(); }
+  virtual ~CasStatus() {}
+
+  virtual CasStatusCode status_code() const { return status_; }
+  virtual const std::string& error_string() const { return err_string_; }
+  virtual bool ok() const { return status_ == CasStatusCode::kNoError; }
+
+ private:
+  CasStatusCode status_;
+  std::string err_string_;
+};
+
+}  // namespace wvcas
+
+#endif  // CAS_STATUS_H