Add EMMG to carry fingerprinting and service blocking info

util/endian/BUILD

@@ -17,3 +17,13 @@ cc_library(
         "endian.h",
     ],
 )
+
+cc_test(
+    name = "endian_test",
+    srcs = ["endian_test.cc"],
+    deps = [
+        ":endian",
+        "//testing:gunit_main",
+        "@abseil_repo//absl/strings",
+    ],
+)

util/endian/endian.h

@@ -10,6 +10,7 @@
 #define UTIL_ENDIAN_ENDIAN_H_
 
 #include <netinet/in.h>
+
 #include <cstdint>
 
 
@@ -19,7 +20,8 @@ namespace widevine {
 // order and big-endian byte order (same as network byte order)
 class BigEndian {
  public:
-  static uint32_t Load32(const char* data) {
+  static uint32_t Load32(const char* indata) {
+    const uint8_t* data = reinterpret_cast<const uint8_t*>(indata);
     return (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
   }
 

util/endian/endian_test.cc

@@ -0,0 +1,21 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2020 Google LLC.
+//
+// This software is licensed under the terms defined in the Widevine Master
+// License Agreement. For a copy of this agreement, please contact
+// widevine-licensing@google.com.
+////////////////////////////////////////////////////////////////////////////////
+#include "util/endian/endian.h"
+
+#include "testing/gmock.h"
+#include "testing/gunit.h"
+#include "absl/strings/escaping.h"
+
+TEST(BigEndian, Load32) {
+  const char value[] = "000000c8";
+  EXPECT_EQ(static_cast<uint32_t>(0xC8),
+            widevine::BigEndian::Load32(
+                absl::HexStringToBytes(std::string(value)).data()));
+}
+
+namespace widevine {}  // namespace widevine