Merge branch 'google3'

Change-Id: I8b28b1d3a5280581f20e4edf9144641a12df8879

cpp/platform/impl/shared/BUILD

@@ -43,3 +43,31 @@ cc_library(
     ],
     deps = ["//platform/api"],
 )
+
+cc_library(
+    name = "file",
+    srcs = ["file_impl.cc"],
+    hdrs = ["file_impl.h"],
+    visibility = [
+        "//googlemac/iPhone/Shared/Nearby/Connections:__subpackages__",
+        "//core:__subpackages__",
+        "//platform/impl:__subpackages__",
+    ],
+    deps = [
+        "//platform:types",
+        "//platform/api",
+    ],
+)
+
+cc_test(
+    name = "file_test",
+    timeout = "short",
+    srcs = [
+        "file_impl_test.cc",
+    ],
+    deps = [
+        ":file",
+        "//file/util:temp_path",
+        "//testing/base/public:gunit_main",
+    ],
+)

cpp/platform/impl/shared/CMakeLists.txt

@@ -41,6 +41,26 @@ target_link_libraries(platform_impl_shared_posix_condition_variable
     absl::raw_logging_internal
 )
 
+add_library(platform_impl_shared_file STATIC)
+
+target_sources(platform_impl_shared_file
+  PRIVATE
+    "file_impl.cc"
+  PUBLIC
+    "file_impl.h"
+)
+
+target_include_directories(platform_impl_shared_file
+  PUBLIC
+    ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+target_link_libraries(platform_impl_shared_file
+  PUBLIC
+    platform_api
+    platform_types
+)
+
 add_library(platform_impl_shared_atomic_boolean STATIC)
 
 target_sources(platform_impl_shared_atomic_boolean

cpp/platform/impl/shared/file_impl.cc

@@ -0,0 +1,75 @@
+#include "platform/impl/shared/file_impl.h"
+
+#include <cstddef>
+#include <memory>
+
+namespace location {
+namespace nearby {
+
+// InputFile
+
+InputFileImpl::InputFileImpl(const std::string& path, std::int64_t size)
+    : file_(path), path_(path), total_size_(size) {}
+
+ExceptionOr<ConstPtr<ByteArray>> InputFileImpl::read(int64_t size) {
+  if (!file_.is_open()) {
+    return ExceptionOr<ConstPtr<ByteArray>>(Exception::IO);
+  }
+
+  if (file_.peek() == EOF) {
+    return ExceptionOr<ConstPtr<ByteArray>>(ConstPtr<ByteArray>());
+  }
+
+  if (!file_.good()) {
+    return ExceptionOr<ConstPtr<ByteArray>>(Exception::IO);
+  }
+
+  std::unique_ptr<char[]> read_bytes {new char [size]};
+  file_.read(read_bytes.get(), static_cast<ptrdiff_t>(size));
+  auto num_bytes_read = file_.gcount();
+  if (num_bytes_read == 0) {
+    return ExceptionOr<ConstPtr<ByteArray>>(Exception::IO);
+  }
+
+  return ExceptionOr<ConstPtr<ByteArray>>(
+      MakeConstPtr(new ByteArray(read_bytes.get(), num_bytes_read)));
+}
+
+std::string InputFileImpl::getFilePath() const { return path_; }
+
+std::int64_t InputFileImpl::getTotalSize() const { return total_size_; }
+
+void InputFileImpl::close() {
+  if (file_.is_open()) {
+    file_.close();
+  }
+}
+
+// OutputFile
+
+OutputFileImpl::OutputFileImpl(const std::string& path) : file_(path) {}
+
+Exception::Value OutputFileImpl::write(ConstPtr<ByteArray> data) {
+  ScopedPtr<ConstPtr<ByteArray>> scoped_data(data);
+
+  if (!file_.is_open()) {
+    return Exception::IO;
+  }
+
+  if (!file_.good()) {
+    return Exception::IO;
+  }
+
+  file_.write(data->getData(), data->size());
+  file_.flush();
+  return file_.good() ? Exception::NONE : Exception::IO;
+}
+
+void OutputFileImpl::close() {
+  if (file_.is_open()) {
+    file_.close();
+  }
+}
+
+}  // namespace nearby
+}  // namespace location

cpp/platform/impl/shared/file_impl.h

@@ -0,0 +1,46 @@
+#ifndef PLATFORM_IMPL_SHARED_FILE_IMPL_H_
+#define PLATFORM_IMPL_SHARED_FILE_IMPL_H_
+
+#include <cstdint>
+#include <fstream>
+
+#include "platform/api/input_file.h"
+#include "platform/api/output_file.h"
+#include "platform/exception.h"
+#include "platform/ptr.h"
+
+namespace location {
+namespace nearby {
+
+class InputFileImpl final : public InputFile {
+ public:
+  InputFileImpl(const std::string& path, std::int64_t size);
+  ~InputFileImpl() override {}
+
+  ExceptionOr<ConstPtr<ByteArray>> read(std::int64_t size) override;
+  std::string getFilePath() const override;
+  std::int64_t getTotalSize() const override;
+  void close() override;
+
+ private:
+  std::ifstream file_;
+  const std::string path_;
+  const std::int64_t total_size_;
+};
+
+class OutputFileImpl final : public OutputFile {
+ public:
+  explicit OutputFileImpl(const std::string& path);
+  ~OutputFileImpl() override {}
+
+  Exception::Value write(ConstPtr<ByteArray> data) override;
+  void close() override;
+
+ private:
+  std::ofstream file_;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_SHARED_FILE_IMPL_H_

cpp/platform/impl/shared/file_impl_test.cc

@@ -0,0 +1,133 @@
+#include "platform/impl/shared/file_impl.h"
+
+#include <cstdio>
+#include <cstring>
+#include <fstream>
+#include <memory>
+#include <ostream>
+#include <unistd.h>
+
+#include "gtest/gtest.h"
+
+namespace location {
+namespace nearby {
+
+
+class FileImplTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    path_ = std::tmpnam(nullptr);;
+    std::ofstream output_file(path_);
+    file_ = std::fstream(path_, std::fstream::in | std::fstream::out);
+  }
+
+  void WriteToFile(const std::string& text) {
+    file_ << text;
+    file_.flush();
+    size_ += text.size();
+  }
+
+  size_t GetSize() const { return size_; }
+
+  void AssertEquals(const ExceptionOr<ConstPtr<ByteArray>>& bytes,
+                    const std::string& expected) {
+    ASSERT_TRUE(bytes.ok());
+    ScopedPtr<ConstPtr<ByteArray>> byte_array(bytes.result());
+    ASSERT_STREQ(byte_array->getData(), expected.c_str());
+    ASSERT_EQ(byte_array->size(), expected.length());
+  }
+
+  void AssertNull(const ExceptionOr<ConstPtr<ByteArray>>& bytes) {
+    ASSERT_TRUE(bytes.ok());
+    ASSERT_TRUE(bytes.result().isNull());
+  }
+
+  static constexpr int64_t kMaxSize = 3;
+
+  std::string path_;
+  std::fstream file_;
+  size_t size_ = 0;
+};
+
+TEST_F(FileImplTest, InputFile_NonExistentPath) {
+  InputFileImpl input_file("/not/a/valid/path.txt", GetSize());
+  ExceptionOr<ConstPtr<ByteArray>> read_result = input_file.read(kMaxSize);
+  ASSERT_FALSE(read_result.ok());
+  ASSERT_EQ(read_result.exception(), Exception::IO);
+}
+
+TEST_F(FileImplTest, InputFile_GetFilePath) {
+  InputFileImpl input_file(path_, GetSize());
+  ASSERT_EQ(input_file.getFilePath(), path_);
+}
+
+TEST_F(FileImplTest, InputFile_EmptyFileEOF) {
+  InputFileImpl input_file(path_, GetSize());
+  AssertNull(input_file.read(kMaxSize));
+}
+
+TEST_F(FileImplTest, InputFile_ReadWorks) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  auto read_data = input_file.read(kMaxSize);
+  read_data.result().destroy();
+  SUCCEED();
+}
+
+TEST_F(FileImplTest, InputFile_ReadUntilEOF) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  AssertEquals(input_file.read(kMaxSize), "abc");
+  AssertNull(input_file.read(kMaxSize));
+}
+
+TEST_F(FileImplTest, InputFile_ReadWithSize) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  AssertEquals(input_file.read(2), "ab");
+  AssertEquals(input_file.read(1), "c");
+  AssertNull(input_file.read(kMaxSize));
+}
+
+TEST_F(FileImplTest, InputFile_GetTotalSize) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  EXPECT_EQ(input_file.getTotalSize(), 3);
+  AssertEquals(input_file.read(1), "a");
+  EXPECT_EQ(input_file.getTotalSize(), 3);
+}
+
+TEST_F(FileImplTest, InputFile_Close) {
+  WriteToFile("abc");
+  InputFileImpl input_file(path_, GetSize());
+  input_file.close();
+  ExceptionOr<ConstPtr<ByteArray>> read_result = input_file.read(kMaxSize);
+  ASSERT_FALSE(read_result.ok());
+  ASSERT_EQ(read_result.exception(), Exception::IO);
+}
+
+TEST_F(FileImplTest, OutputFile_NonExistentPath) {
+  OutputFileImpl output_file("/not/a/valid/path.txt");
+  ConstPtr<ByteArray> bytes = MakeConstPtr(new ByteArray("a", 1));
+  Exception::Value write_result = output_file.write(bytes);
+  ASSERT_EQ(write_result, Exception::IO);
+}
+
+TEST_F(FileImplTest, OutputFile_Write) {
+  OutputFileImpl output_file(path_);
+  ConstPtr<ByteArray> bytes1 = MakeConstPtr(new ByteArray("a", 1));
+  ConstPtr<ByteArray> bytes2 = MakeConstPtr(new ByteArray("bc", 2));
+  ASSERT_EQ(output_file.write(bytes1), Exception::NONE);
+  ASSERT_EQ(output_file.write(bytes2), Exception::NONE);
+  InputFileImpl input_file(path_, GetSize());
+  AssertEquals(input_file.read(kMaxSize), "abc");
+}
+
+TEST_F(FileImplTest, OutputFile_Close) {
+  OutputFileImpl output_file(path_);
+  output_file.close();
+  ConstPtr<ByteArray> bytes = MakeConstPtr(new ByteArray("a", 1));
+  ASSERT_EQ(output_file.write(bytes), Exception::IO);
+}
+}  // namespace nearby
+}  // namespace location