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.

wvutil/include/platform.h

@@ -0,0 +1,31 @@
+// Copyright 2018 Google LLC. All Rights Reserved. This file and proprietary
+// source code may only be used and distributed under the Widevine License
+// Agreement.
+//
+// Platform - Abstracts some utilities between platforms.
+//
+#ifndef WVCDM_UTIL_PLATFORM_H_
+#define WVCDM_UTIL_PLATFORM_H_
+
+#include "util_common.h"
+
+#ifdef _WIN32
+#  include <BaseTsd.h>
+#  include <winsock2.h>  // For htonl and ntohl.
+#  include <wtypes.h>
+#  define __PRETTY_FUNCTION__ __FUNCTION__
+#  undef NO_ERROR
+#  undef GetCurrentTime
+#  undef DeleteFile
+
+using ssize_t = SSIZE_T;
+
+inline void sleep(int seconds) { Sleep(seconds * 1000); }
+int setenv(const char* key, const char* value, int overwrite);
+#else
+#  include <arpa/inet.h>
+#  include <sys/types.h>
+#  include <unistd.h>
+#endif
+
+#endif  // WVCDM_UTIL_PLATFORM_H_