[BLE Refactor] Tune BleAdvertisement, BleAdvertisementHeader, BlePeripheral, AdvertisementReadResult, BleUtils.

PiperOrigin-RevId: 439365106

internal/platform/BUILD

@@ -197,6 +197,7 @@ cc_test(
         ":test_util",
         "//internal/platform/implementation/g3",  # build_cleaner: keep
         "@com_github_protobuf_matchers//protobuf-matchers",
+        "@com_google_absl//absl/hash:hash_testing",
         "@com_google_googletest//:gtest_main",
     ],
 )

internal/platform/byte_array.h

@@ -99,6 +99,12 @@ class ByteArray {
     return absl::string_view(data(), size());
   }
 
+  // Hashable
+  template <typename H>
+  friend H AbslHashValue(H h, const ByteArray& m) {
+    return H::combine(std::move(h), m.data_);
+  }
+
  private:
   std::string data_;
 };

internal/platform/byte_array_test.cc

@@ -17,6 +17,7 @@
 #include <cstring>
 
 #include "gtest/gtest.h"
+#include "absl/hash/hash_testing.h"
 
 namespace {
 
@@ -95,4 +96,13 @@ TEST(ByteArrayTest, CreateFromAbslStringReturnsTheSame) {
   EXPECT_EQ(bytes.AsStringView(), kTestString);
 }
 
+TEST(ByteArrayTest, Hash) {
+  EXPECT_TRUE(absl::VerifyTypeImplementsAbslHashCorrectly({
+      ByteArray(),
+      ByteArray("12345"),
+      ByteArray("ABCDE"),
+      ByteArray("A1B2Z"),
+  }));
+}
+
 }  // namespace