WIFI Hotspot implementation (3)

Part 3: WIFI Hotspot platform code for Windows

PiperOrigin-RevId: 441826092

internal/platform/implementation/windows/BUILD

@@ -64,13 +64,22 @@ cc_library(
         "thread_pool.h",
         "webrtc.h",
         "wifi.h",
+        "wifi_hotspot.h",
         "wifi_lan.h",
     ],
     visibility = ["//visibility:private"],
     deps = [
         "//internal/platform:base",
+        "//internal/platform:types",
         "//internal/platform/implementation:comm",
+        "//internal/platform/implementation:types",
         "//internal/platform/implementation/windows/generated:types",
+        "@com_google_absl//absl/base:core_headers",
+        "@com_google_absl//absl/container:flat_hash_map",
+        "@com_google_absl//absl/container:flat_hash_set",
+        "@com_google_absl//absl/memory",
+        "@com_google_absl//absl/synchronization",
+        "@com_google_absl//absl/types:optional",
     ],
 )
 
@@ -103,6 +112,9 @@ cc_library(
         "system_clock.cc",
         "thread_pool.cc",
         "utils.cc",
+        "wifi_hotspot_medium.cc",
+        "wifi_hotspot_server_socket.cc",
+        "wifi_hotspot_socket.cc",
         "wifi_lan_medium.cc",
         "wifi_lan_server_socket.cc",
         "wifi_lan_socket.cc",
@@ -117,12 +129,16 @@ cc_library(
         ":comm",
         ":crypto",  # build_cleaner: keep
         ":types",
+        "//internal/platform:base",
+        "//internal/platform:cancellation_flag",
         "//internal/platform:types",
-        "//internal/platform/implementation:comm",
         "//internal/platform/implementation:platform",
+        "//internal/platform/implementation:types",
         "//internal/platform/implementation/shared:count_down_latch",
         "//internal/platform/implementation/shared:file",
         "//internal/platform/implementation/windows/generated:types",
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/strings:str_format",
     ],
 )
 

internal/platform/implementation/windows/platform.cc

@@ -19,6 +19,7 @@
 #include <windows.h>
 
 #include <xstring>
+#include <string>
 #include <sstream>
 
 #include "internal/platform/implementation/shared/count_down_latch.h"
@@ -42,6 +43,7 @@
 #include "internal/platform/implementation/windows/webrtc.h"
 #include "internal/platform/implementation/windows/wifi.h"
 #include "internal/platform/implementation/windows/wifi_lan.h"
+#include "internal/platform/implementation/windows/wifi_hotspot.h"
 
 namespace location {
 namespace nearby {
@@ -234,7 +236,7 @@ std::unique_ptr<WifiLanMedium> ImplementationPlatform::CreateWifiLanMedium() {
 
 std::unique_ptr<WifiHotspotMedium>
 ImplementationPlatform::CreateWifiHotspotMedium() {
-  return nullptr;
+  return std::make_unique<windows::WifiHotspotMedium>();
 }
 
 // TODO(b/184975123): replace with real implementation.

internal/platform/implementation/windows/utils.cc

@@ -15,7 +15,9 @@
 #include "internal/platform/implementation/windows/utils.h"
 
 // Windows headers
+#include <inaddr.h>
 #include <strsafe.h>
+#include <winsock.h>
 
 // Standard C/C++ headers
 #include <codecvt>
@@ -43,6 +45,34 @@ std::string uint64_to_mac_address_string(uint64_t bluetoothAddress) {
   return absl::AsciiStrToUpper(buffer);
 }
 
+std::string ipaddr_4bytes_to_dotdecimal_string(
+    absl::string_view ipaddr_4bytes) {
+  in_addr address;
+  address.S_un.S_un_b.s_b1 = ipaddr_4bytes[0];
+  address.S_un.S_un_b.s_b2 = ipaddr_4bytes[1];
+  address.S_un.S_un_b.s_b3 = ipaddr_4bytes[2];
+  address.S_un.S_un_b.s_b4 = ipaddr_4bytes[3];
+  char* ipv4_address = inet_ntoa(address);
+  if (ipv4_address == nullptr) {
+    return {};
+  }
+
+  return std::string(ipv4_address);
+}
+
+std::string ipaddr_dotdecimal_to_4bytes_string(std::string ipv4_s) {
+  in_addr address;
+  address.S_un.S_addr = inet_addr(ipv4_s.c_str());
+  char ipv4_b[5];
+  ipv4_b[0] = address.S_un.S_un_b.s_b1;
+  ipv4_b[1] = address.S_un.S_un_b.s_b2;
+  ipv4_b[2] = address.S_un.S_un_b.s_b3;
+  ipv4_b[3] = address.S_un.S_un_b.s_b4;
+  ipv4_b[4] = 0;
+
+  return std::string(ipv4_b, 4);
+}
+
 std::wstring string_to_wstring(std::string str) {
   std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
   return converter.from_bytes(str);

internal/platform/implementation/windows/utils.h

@@ -33,6 +33,9 @@ using winrt::Windows::Foundation::IInspectable;
 
 std::string uint64_to_mac_address_string(uint64_t bluetoothAddress);
 
+std::string ipaddr_4bytes_to_dotdecimal_string(absl::string_view ipaddr_4bytes);
+std::string ipaddr_dotdecimal_to_4bytes_string(std::string ipv4_s);
+
 // Helpers to windows platform
 std::wstring string_to_wstring(std::string str);
 std::string wstring_to_string(std::wstring wstr);

internal/platform/implementation/windows/utils_test.cc

@@ -14,9 +14,15 @@
 
 #include "internal/platform/implementation/windows/utils.h"
 
+#include <windows.h>
+#include <string>
+
 #include "gtest/gtest.h"
 
-using location::nearby::windows::uint64_to_mac_address_string;
+// using location::nearby::windows::uint64_to_mac_address_string;
+namespace location {
+namespace nearby {
+namespace windows {
 
 TEST(UtilsTests, MacAddressToString) {
   // Arrange
@@ -29,3 +35,24 @@ TEST(UtilsTests, MacAddressToString) {
   // Assert
   EXPECT_EQ(result, expected);
 }
+
+constexpr absl::string_view kIpDotdecimal{"192.168.1.37"};
+constexpr char kIp4Bytes[] = {192, 168, 1, 37};
+
+TEST(UtilsTests, Ip4BytesToDotdecimal) {
+  std::string result =
+      ipaddr_4bytes_to_dotdecimal_string(absl::string_view(kIp4Bytes));
+
+  EXPECT_EQ(result, kIpDotdecimal);
+}
+
+TEST(UtilsTests, IpDotdecimalTo4Bytes) {
+  std::string result =
+      ipaddr_dotdecimal_to_4bytes_string(std::string(kIpDotdecimal));
+
+  EXPECT_EQ(result, std::string(kIp4Bytes));
+}
+
+}  // namespace windows
+}  // namespace nearby
+}  // namespace location