Refactor

This renames the "mock" code to "reference" because that's really what
it is.  Also, some code has been moved from the CDM repo to a common
utility directory so that it can be included here, and the oemcrypto
unit tests can now be built without having access to a current CDM
repo.

There are no functionality changes in this CL.

util/include/log.h

@@ -0,0 +1,46 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Log - Platform independent interface for a Logging class
+//
+#ifndef WVCDM_UTIL_LOG_H_
+#define WVCDM_UTIL_LOG_H_
+
+namespace wvcdm {
+
+// Simple logging class. The implementation is platform dependent.
+
+typedef enum {
+  LOG_ERROR,
+  LOG_WARN,
+  LOG_INFO,
+  LOG_DEBUG,
+  LOG_VERBOSE
+} LogPriority;
+
+extern LogPriority g_cutoff;
+
+// Enable/disable verbose logging (LOGV).
+// This function is supplied for cases where the system layer does not
+// initialize logging.  This is also needed to initialize logging in
+// unit tests.
+void InitLogging();
+
+void Log(const char* file, const char* function, int line, LogPriority level,
+         const char* fmt, ...);
+
+// Log APIs
+#ifndef LOGE
+#define LOGE(...) Log(__FILE__, __func__, __LINE__, \
+                      wvcdm::LOG_ERROR, __VA_ARGS__)
+#define LOGW(...) Log(__FILE__, __func__, __LINE__, \
+                      wvcdm::LOG_WARN, __VA_ARGS__)
+#define LOGI(...) Log(__FILE__, __func__, __LINE__, \
+                      wvcdm::LOG_INFO, __VA_ARGS__)
+#define LOGD(...) Log(__FILE__, __func__, __LINE__, \
+                      wvcdm::LOG_DEBUG, __VA_ARGS__)
+#define LOGV(...) Log(__FILE__, __func__, __LINE__, \
+                      wvcdm::LOG_VERBOSE, __VA_ARGS__)
+#endif
+}  // namespace wvcdm
+
+#endif  // WVCDM_UTIL_LOG_H_