Roll forward to cl/338482889

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I9850950db8bd84f0904ea1a413151887f52098cf

cpp/platform/api/input_file.h

@@ -1,29 +1,25 @@
 #ifndef PLATFORM_API_INPUT_FILE_H_
 #define PLATFORM_API_INPUT_FILE_H_
 
-#include "platform/byte_array.h"
-#include "platform/exception.h"
-#include "platform/ptr.h"
+#include <cstdint>
+
+#include "platform/base/byte_array.h"
+#include "platform/base/exception.h"
+#include "platform/base/input_stream.h"
 
 namespace location {
 namespace nearby {
+namespace api {
 
 // An InputFile represents a readable file on the system.
-class InputFile {
+class InputFile : public InputStream {
  public:
-  virtual ~InputFile() {}
-
-  // The returned ConstPtr will be owned (and destroyed) by the caller.
-  // When we have exhausted reading the file and no bytes remain, read will
-  // always return an empty ConstPtr for which isNull() is true.
-  virtual ExceptionOr<ConstPtr<ByteArray>> read(
-      std::int64_t size) = 0;  // throws Exception::IO when the file cannot be
-                               // opened or read.
-  virtual std::string getFilePath() const = 0;
-  virtual std::int64_t getTotalSize() const = 0;
-  virtual void close() = 0;
+  ~InputFile() override = default;
+  virtual std::string GetFilePath() const = 0;
+  virtual std::int64_t GetTotalSize() const = 0;
 };
 
+}  // namespace api
 }  // namespace nearby
 }  // namespace location