Roll forward to cl/314549634

Change-Id: I4d1e7eacd5fa4078a094571ad6d5f51e422535ff

cpp/platform/impl/sample/BUILD

@@ -14,6 +14,7 @@ cc_library(
         "//platform:types",
         "//platform:utils",
         "//platform/api",
+        "//platform/impl/shared:file",
         "//platform/impl/shared/sample:sample_wifi_medium",
         "//platform/port:string",
         "//absl/time",

cpp/platform/impl/sample/sample_platform.cc

@@ -20,6 +20,7 @@
 #include "platform/cancelable.h"
 #include "platform/impl/sample/atomic_reference_impl.h"
 #include "platform/impl/sample/settable_future_impl.h"
+#include "platform/impl/shared/file_impl.h"
 #include "platform/impl/shared/sample/sample_wifi_medium.h"
 #include "platform/port/string.h"
 #include "platform/ptr.h"
@@ -30,6 +31,12 @@ namespace location {
 namespace nearby {
 namespace platform {
 
+namespace {
+std::string getPayloadPath(std::int64_t payload_id) {
+  return "/tmp/sample-" + std::to_string(payload_id);
+}
+}  // namespace
+
 Ptr<ScheduledExecutor> ImplementationPlatform::createScheduledExecutor() {
   return Ptr<ScheduledExecutor>{};
 }
@@ -80,6 +87,16 @@ Ptr<AtomicBoolean> ImplementationPlatform::createAtomicBoolean(
   return Ptr<AtomicBoolean>{};
 }
 
+Ptr<InputFile> ImplementationPlatform::createInputFile(
+    std::int64_t payload_id, std::int64_t total_size) {
+  return MakePtr(new InputFileImpl(getPayloadPath(payload_id), total_size));
+}
+
+Ptr<OutputFile> ImplementationPlatform::createOutputFile(
+    std::int64_t payload_id) {
+  return MakePtr(new OutputFileImpl(getPayloadPath(payload_id)));
+}
+
 Ptr<BluetoothClassicMedium>
 ImplementationPlatform::createBluetoothClassicMedium() {
   return Ptr<BluetoothClassicMedium>();
@@ -116,10 +133,6 @@ Ptr<HashUtils> ImplementationPlatform::createHashUtils() {
 
 std::string ImplementationPlatform::getDeviceId() { return "sample"; }
 
-std::string ImplementationPlatform::getPayloadPath(int64_t payload_id) {
-  return "/tmp/sample-" + std::to_string(payload_id);
-}
-
 }  // namespace platform
 }  // namespace nearby
 }  // namespace location