created a helpers file, removed asserts, removed filsystem header usage, changed constants+functions+tests naming

oss-internship-2020/sapi_lodepng/examples/CMakeLists.txt

@@ -15,21 +15,29 @@
 # Build the unsandboxed main
 add_executable(lodepng_unsandboxed
   main_unsandboxed.cc
+  helpers.cc
 )
 
 target_link_libraries(lodepng_unsandboxed PRIVATE
   lodepng
+  sapi::sapi
+  sandbox2::temp_file
+  sandbox2::fileops
+  glog::glog
 )
 
 # Build the sandboxed main
 add_executable(lodepng_sandboxed
   main_sandboxed.cc
   sandbox.h
+  helpers.cc
 )
 
 target_link_libraries(lodepng_sandboxed PRIVATE
   lodepng_sapi
   sapi::sapi
+  sandbox2::temp_file
+  sandbox2::fileops
   sapi::vars
   sapi::status
   glog::glog
@@ -41,6 +49,7 @@ enable_testing()
 
 add_executable(main_unit_test
   main_unit_test.cc
+  helpers.cc
 )
 
 target_link_libraries(main_unit_test PRIVATE
@@ -51,8 +60,11 @@ target_link_libraries(main_unit_test PRIVATE
   glog::glog
   sapi::flags
   sapi::sapi
+  sandbox2::temp_file
+  sandbox2::fileops
   sapi::status
   sapi::test_main
   sapi::vars
 )
 gtest_discover_tests(main_unit_test)
+

oss-internship-2020/sapi_lodepng/examples/helpers.cc

@@ -0,0 +1,38 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "helpers.h"
+
+std::vector<uint8_t> GenerateValues() {
+  std::vector<uint8_t> image(kImgLen);
+  for (int y = 0; y < kHeight; ++y) {
+    for (int x = 0; x < kWidth; ++x) {
+      image[4 * kWidth * y + 4 * x + 0] = 255 * !(x & y);
+      image[4 * kWidth * y + 4 * x + 1] = x ^ y;
+      image[4 * kWidth * y + 4 * x + 2] = x | y;
+      image[4 * kWidth * y + 4 * x + 3] = 255;
+    }
+  }
+  return image;
+}
+
+std::string CreateTempDirAtCWD() {
+  std::string cwd = sandbox2::file_util::fileops::GetCWD();
+  CHECK(!cwd.empty());
+  cwd.append("/");
+
+  sapi::StatusOr<std::string> result = sandbox2::CreateTempDir(cwd);
+  CHECK(result.ok());
+  return result.value();
+}

oss-internship-2020/sapi_lodepng/examples/helpers.h

@@ -0,0 +1,27 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <glog/logging.h>
+
+#include <cstdint>
+#include <vector>
+
+#include "sandboxed_api/sandbox2/util/fileops.h"
+#include "sandboxed_api/sandbox2/util/temp_file.h"
+
+constexpr uint32_t kWidth = 512, kHeight = 512, kImgLen = kWidth * kHeight * 4;
+
+std::vector<uint8_t> GenerateValues();
+
+std::string CreateTempDirAtCWD();

oss-internship-2020/sapi_lodepng/examples/main_sandboxed.cc

@@ -12,56 +12,41 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include <cassert>
+#include <glog/logging.h>
+
 #include <filesystem>
 #include <iostream>
 
+#include "helpers.h"
 #include "sandbox.h"
-#include "sandboxed_api/util/flag.h"
-
-ABSL_FLAG(string, images_path, std::filesystem::current_path().string(),
-          "path to the folder containing test images");
-
-void generate_one_step(SapiLodepngSandbox &sandbox, LodepngApi &api) {
-  constexpr unsigned int width = 512, height = 512,
-                         img_len = width * height * 4;
-  std::vector<unsigned char> image(img_len);
-
-  for (int y = 0; y < height; ++y) {
-    for (int x = 0; x < width; ++x) {
-      image[4 * width * y + 4 * x + 0] = 255 * !(x & y);
-      image[4 * width * y + 4 * x + 1] = x ^ y;
-      image[4 * width * y + 4 * x + 2] = x | y;
-      image[4 * width * y + 4 * x + 3] = 255;
-    }
-  }
 
+void EncodeDecodeOneStep(SapiLodepngSandbox &sandbox, LodepngApi &api) {
   // encode the image
-  sapi::v::Array<unsigned char> sapi_image(image.data(), img_len);
-  sapi::v::UInt sapi_width(width), sapi_height(height);
+  std::vector<uint8_t> image(GenerateValues());
+
+  sapi::v::Array<uint8_t> sapi_image(image.data(), kImgLen);
   sapi::v::ConstCStr sapi_filename("/output/out_generated1.png");
 
   sapi::StatusOr<unsigned int> result = api.lodepng_encode32_file(
-      sapi_filename.PtrBefore(), sapi_image.PtrBefore(), sapi_width.GetValue(),
-      sapi_height.GetValue());
+      sapi_filename.PtrBefore(), sapi_image.PtrBefore(), kWidth, kHeight);
 
-  assert(result.ok());
-  assert(!result.value());
+  CHECK(result.ok());
+  CHECK(!result.value());
 
   // after the image has been encoded, decode it to check that the
   // pixel values are the same
 
   sapi::v::UInt sapi_width2, sapi_height2;
-  sapi::v::IntBase<unsigned char *> sapi_image_ptr(0);
+  sapi::v::IntBase<uint8_t *> sapi_image_ptr(0);
 
   result = api.lodepng_decode32_file(
       sapi_image_ptr.PtrBoth(), sapi_width2.PtrBoth(), sapi_height2.PtrBoth(),
       sapi_filename.PtrBefore());
-  assert(result.ok());
-  assert(!result.value());
+  CHECK(result.ok());
+  CHECK(!result.value());
 
-  assert(sapi_width2.GetValue() == width);
-  assert(sapi_height2.GetValue() == height);
+  CHECK(sapi_width2.GetValue() == kWidth);
+  CHECK(sapi_height2.GetValue() == kHeight);
 
   // the pixels have been allocated inside the sandboxed process
   // memory, so we need to transfer them to this process.
@@ -73,74 +58,54 @@ void generate_one_step(SapiLodepngSandbox &sandbox, LodepngApi &api) {
   // that will be transferred is located
   // 4) transfer the memory to this process (this step is why we need
   // the pointer and the length)
-  sapi::v::RemotePtr sapi_remote_out_ptr(sapi_image_ptr.GetValue());
-  sapi::v::Array<unsigned char> sapi_pixels(img_len);
-  sapi_pixels.SetRemote(sapi_remote_out_ptr.GetValue());
+  sapi::v::Array<uint8_t> sapi_pixels(kImgLen);
+  sapi_pixels.SetRemote(sapi_image_ptr.GetValue());
 
-  assert(sandbox.TransferFromSandboxee(&sapi_pixels).ok());
-
-  // after the memory has been transferred, we can access it
-  // using the GetData function
-  unsigned char *pixels_ptr = sapi_pixels.GetData();
+  CHECK(sandbox.TransferFromSandboxee(&sapi_pixels).ok());
 
   // now, we can compare the values
-  for (size_t i = 0; i < img_len; ++i) {
-    assert(pixels_ptr[i] == image[i]);
-  }
+  CHECK(std::equal(image.begin(), image.end(), sapi_pixels.GetData()));
+  CHECK(sandbox.GetRpcChannel()->Free(sapi_image_ptr.GetValue()).ok());
 }
 
-void generate_two_steps(SapiLodepngSandbox &sandbox, LodepngApi &api) {
+void EncodeDecodeTwoSteps(SapiLodepngSandbox &sandbox, LodepngApi &api) {
   // generate the values
-  constexpr unsigned int width = 512, height = 512,
-                         img_len = width * height * 4;
-  std::vector<unsigned char> image(img_len);
-
-  for (int y = 0; y < height; ++y) {
-    for (int x = 0; x < width; ++x) {
-      image[4 * width * y + 4 * x + 0] = 255 * !(x & y);
-      image[4 * width * y + 4 * x + 1] = x ^ y;
-      image[4 * width * y + 4 * x + 2] = x | y;
-      image[4 * width * y + 4 * x + 3] = 255;
-    }
-  }
+  std::vector<uint8_t> image(GenerateValues());
 
   // encode the image into memory first
-  sapi::v::Array<unsigned char> sapi_image(image.data(), img_len);
-  sapi::v::UInt sapi_width(width), sapi_height(height);
+  sapi::v::Array<uint8_t> sapi_image(image.data(), kImgLen);
   sapi::v::ConstCStr sapi_filename("/output/out_generated2.png");
 
   sapi::v::ULLong sapi_pngsize;
-  sapi::v::IntBase<unsigned char *> sapi_png_ptr(0);
+  sapi::v::IntBase<uint8_t *> sapi_png_ptr(0);
 
   // encode it into memory
-  sapi::StatusOr<unsigned int> result = api.lodepng_encode32(
-      sapi_png_ptr.PtrBoth(), sapi_pngsize.PtrBoth(), sapi_image.PtrBefore(),
-      sapi_width.GetValue(), sapi_height.GetValue());
+  sapi::StatusOr<unsigned int> result =
+      api.lodepng_encode32(sapi_png_ptr.PtrBoth(), sapi_pngsize.PtrBoth(),
+                           sapi_image.PtrBefore(), kWidth, kHeight);
 
-  assert(result.ok());
-  assert(!result.value());
+  CHECK(result.ok());
+  CHECK(!result.value());
 
   // the new array (pointed to by sapi_png_ptr) is allocated
   // inside the sandboxed process so we need to transfer it to this
   // process
-  sapi::v::RemotePtr sapi_remote_out_ptr(sapi_png_ptr.GetValue());
-  sapi::v::Array<unsigned char> sapi_png_array(sapi_pngsize.GetValue());
+  sapi::v::Array<uint8_t> sapi_png_array(sapi_pngsize.GetValue());
+  sapi_png_array.SetRemote(sapi_png_ptr.GetValue());
 
-  sapi_png_array.SetRemote(sapi_remote_out_ptr.GetValue());
-
-  assert(sandbox.TransferFromSandboxee(&sapi_png_array).ok());
+  CHECK(sandbox.TransferFromSandboxee(&sapi_png_array).ok());
 
   // write the image into the file (from memory)
   result =
       api.lodepng_save_file(sapi_png_array.PtrBefore(), sapi_pngsize.GetValue(),
                             sapi_filename.PtrBefore());
 
-  assert(result.ok());
-  assert(!result.value());
+  CHECK(result.ok());
+  CHECK(!result.value());
 
   // now, decode the image using the 2 steps in order to compare the values
   sapi::v::UInt sapi_width2, sapi_height2;
-  sapi::v::IntBase<unsigned char *> sapi_png_ptr2(0);
+  sapi::v::IntBase<uint8_t *> sapi_png_ptr2(0);
   sapi::v::ULLong sapi_pngsize2;
 
   // load the file in memory
@@ -148,58 +113,58 @@ void generate_two_steps(SapiLodepngSandbox &sandbox, LodepngApi &api) {
       api.lodepng_load_file(sapi_png_ptr2.PtrBoth(), sapi_pngsize2.PtrBoth(),
                             sapi_filename.PtrBefore());
 
-  assert(result.ok());
-  assert(!result.value());
+  CHECK(result.ok());
+  CHECK(!result.value());
 
-  assert(sapi_pngsize.GetValue() == sapi_pngsize2.GetValue());
+  CHECK(sapi_pngsize.GetValue() == sapi_pngsize2.GetValue());
 
   // transfer the png array
-  sapi::v::RemotePtr sapi_remote_out_ptr2(sapi_png_ptr2.GetValue());
-  sapi::v::Array<unsigned char> sapi_png_array2(sapi_pngsize2.GetValue());
+  sapi::v::Array<uint8_t> sapi_png_array2(sapi_pngsize2.GetValue());
+  sapi_png_array2.SetRemote(sapi_png_ptr2.GetValue());
 
-  sapi_png_array2.SetRemote(sapi_remote_out_ptr2.GetValue());
-
-  assert(sandbox.TransferFromSandboxee(&sapi_png_array2).ok());
+  CHECK(sandbox.TransferFromSandboxee(&sapi_png_array2).ok());
 
   // after the file is loaded, decode it so we have access to the values
   // directly
-  sapi::v::IntBase<unsigned char *> sapi_png_ptr3(0);
+  sapi::v::IntBase<uint8_t *> sapi_png_ptr3(0);
   result = api.lodepng_decode32(
       sapi_png_ptr3.PtrBoth(), sapi_width2.PtrBoth(), sapi_height2.PtrBoth(),
       sapi_png_array2.PtrBefore(), sapi_pngsize2.GetValue());
 
-  assert(result.ok());
-  assert(!result.value());
+  CHECK(result.ok());
+  CHECK(!result.value());
 
-  assert(sapi_width2.GetValue() == width);
-  assert(sapi_height2.GetValue() == height);
+  CHECK(sapi_width2.GetValue() == kWidth);
+  CHECK(sapi_height2.GetValue() == kHeight);
 
   // transfer the pixels so they can be used
-  sapi::v::RemotePtr sapi_remote_out_ptr3(sapi_png_ptr3.GetValue());
-  sapi::v::Array<unsigned char> sapi_pixels(img_len);
+  sapi::v::Array<uint8_t> sapi_pixels(kImgLen);
+  sapi_pixels.SetRemote(sapi_png_ptr3.GetValue());
 
-  sapi_pixels.SetRemote(sapi_remote_out_ptr3.GetValue());
-
-  assert(sandbox.TransferFromSandboxee(&sapi_pixels).ok());
-
-  unsigned char *pixels_ptr = sapi_pixels.GetData();
+  CHECK(sandbox.TransferFromSandboxee(&sapi_pixels).ok());
 
   // compare values
-  for (size_t i = 0; i < img_len; ++i) {
-    assert(pixels_ptr[i] == image[i]);
-  }
+  CHECK(std::equal(image.begin(), image.end(), sapi_pixels.GetData()));
+
+  CHECK(sandbox.GetRpcChannel()->Free(sapi_png_ptr.GetValue()).ok());
+  CHECK(sandbox.GetRpcChannel()->Free(sapi_png_ptr2.GetValue()).ok());
+  CHECK(sandbox.GetRpcChannel()->Free(sapi_png_ptr3.GetValue()).ok());
 }
 
 int main(int argc, char *argv[]) {
-  gflags::ParseCommandLineFlags(&argc, &argv, true);
+  google::InitGoogleLogging(argv[0]);
 
-  SapiLodepngSandbox sandbox(absl::GetFlag(FLAGS_images_path));
-  assert(sandbox.Init().ok());
+  const std::string images_path = CreateTempDirAtCWD();
+
+  SapiLodepngSandbox sandbox(images_path);
+  CHECK(sandbox.Init().ok());
 
   LodepngApi api(&sandbox);
 
-  generate_one_step(sandbox, api);
-  generate_two_steps(sandbox, api);
+  EncodeDecodeOneStep(sandbox, api);
+  EncodeDecodeTwoSteps(sandbox, api);
+
+  CHECK(sandbox2::file_util::fileops::DeleteRecursively(images_path));
 
   return EXIT_SUCCESS;
 }

oss-internship-2020/sapi_lodepng/examples/main_unit_test.cc

@@ -12,64 +12,66 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include <filesystem>
-
 #include "gtest/gtest.h"
+#include "helpers.h"
 #include "sandbox.h"
 #include "sandboxed_api/util/status_matchers.h"
 
-using sapi::IsOk;
-using testing::Eq;
-using testing::NotNull;
+using ::sapi::IsOk;
+using ::testing::Eq;
+using ::testing::NotNull;
+using ::testing::IsTrue;
 
 namespace {
 
-// use the current path
-const std::string images_path = std::filesystem::current_path().string();
+TEST(HelpersTest, CreateTempDirAtCWD) {
+  const std::string images_path = CreateTempDirAtCWD();
+    EXPECT_THAT(sandbox2::file_util::fileops::Exists(images_path, false), IsTrue());
 
-TEST(initSandbox, basic) {
+  ASSERT_THAT(sandbox2::file_util::fileops::DeleteRecursively(images_path),
+              IsTrue());
+}
+
+TEST(HelpersTest, GenerateValues) {
+    EXPECT_THAT(GenerateValues().size(), Eq(kImgLen));
+}
+
+TEST(LodePngTest, Init) {
+  const std::string images_path = CreateTempDirAtCWD();
   SapiLodepngSandbox sandbox(images_path);
   ASSERT_THAT(sandbox.Init(), IsOk()) << "Error during sandbox init";
+
+  ASSERT_THAT(sandbox2::file_util::fileops::DeleteRecursively(images_path),
+              IsTrue());
 }
 
 // generate an image, encode it, decode it and compare the pixels with the
 // initial values
-TEST(generate_image, encode_decode_compare_one_step) {
+TEST(LodePngTest, EncodeDecodeOneStep) {
+  const std::string images_path = CreateTempDirAtCWD();
+
   SapiLodepngSandbox sandbox(images_path);
   ASSERT_THAT(sandbox.Init(), IsOk()) << "Error during sandbox init";
   LodepngApi api(&sandbox);
 
   // generate the values
-  constexpr unsigned int width = 512, height = 512,
-                         img_len = width * height * 4;
-  std::vector<unsigned char> image(img_len);
-
-  for (int y = 0; y < height; ++y) {
-    for (int x = 0; x < width; ++x) {
-      image[4 * width * y + 4 * x + 0] = 255 * !(x & y);
-      image[4 * width * y + 4 * x + 1] = x ^ y;
-      image[4 * width * y + 4 * x + 2] = x | y;
-      image[4 * width * y + 4 * x + 3] = 255;
-    }
-  }
+  std::vector<uint8_t> image(GenerateValues());
 
   // encode the image
-  sapi::v::Array<unsigned char> sapi_image(image.data(), img_len);
-  sapi::v::UInt sapi_width(width), sapi_height(height);
+  sapi::v::Array<uint8_t> sapi_image(image.data(), kImgLen);
   sapi::v::ConstCStr sapi_filename("/output/out_generated1.png");
 
   SAPI_ASSERT_OK_AND_ASSIGN(
       unsigned int result,
       api.lodepng_encode32_file(sapi_filename.PtrBefore(),
-                                sapi_image.PtrBefore(), sapi_width.GetValue(),
-                                sapi_height.GetValue()));
+                                sapi_image.PtrBefore(), kWidth, kHeight));
 
   ASSERT_THAT(result, Eq(0)) << "Result from encode32_file not 0";
 
   // after the image has been encoded, decode it to check that the
   // pixel values are the same
   sapi::v::UInt sapi_width2, sapi_height2;
-  sapi::v::IntBase<unsigned char *> sapi_image_ptr(0);
+  sapi::v::IntBase<uint8_t *> sapi_image_ptr(0);
 
   SAPI_ASSERT_OK_AND_ASSIGN(
       result, api.lodepng_decode32_file(
@@ -78,8 +80,8 @@ TEST(generate_image, encode_decode_compare_one_step) {
 
   ASSERT_THAT(result, Eq(0)) << "Result from decode32_file not 0";
 
-  EXPECT_THAT(sapi_width2.GetValue(), Eq(width)) << "Widths differ";
-  EXPECT_THAT(sapi_height2.GetValue(), Eq(height)) << "Heights differ";
+  EXPECT_THAT(sapi_width2.GetValue(), Eq(kWidth)) << "Widths differ";
+  EXPECT_THAT(sapi_height2.GetValue(), Eq(kHeight)) << "Heights differ";
 
   // the pixels have been allocated inside the sandboxed process
   // memory, so we need to transfer them to this process.
@@ -91,69 +93,54 @@ TEST(generate_image, encode_decode_compare_one_step) {
   // that will be transferred is located
   // 4) transfer the memory to this process (this step is why we need
   // the pointer and the length)
-  sapi::v::RemotePtr sapi_remote_out_ptr(sapi_image_ptr.GetValue());
-  sapi::v::Array<unsigned char> sapi_pixels(img_len);
-  sapi_pixels.SetRemote(sapi_remote_out_ptr.GetValue());
+  sapi::v::Array<uint8_t> sapi_pixels(kImgLen);
+  sapi_pixels.SetRemote(sapi_image_ptr.GetValue());
 
   ASSERT_THAT(sandbox.TransferFromSandboxee(&sapi_pixels), IsOk())
       << "Error during transfer from sandboxee";
 
-  // after the memory has been transferred, we can access it
-  // using the GetData function
-  unsigned char *pixels_ptr = sapi_pixels.GetData();
-
   // now, we can compare the values
-  for (size_t i = 0; i < img_len; ++i) {
-    EXPECT_THAT(pixels_ptr[i], Eq(image[i])) << "Pixels values differ";
-  }
+  EXPECT_THAT(std::equal(image.begin(), image.end(), sapi_pixels.GetData()),
+              IsTrue())
+      << "values differ";
+
+  ASSERT_THAT(sandbox2::file_util::fileops::DeleteRecursively(images_path),
+              IsTrue());
 }
 
 // similar to the previous test, only that we use encoding by saving the data in
 // memory and then writing it to the file and decoding by first decoding in
 // memory and then getting the actual pixel values.
-TEST(generate_image, encode_decode_compare_two_steps) {
+TEST(LodePngTest, EncodeDecodeTwoSteps) {
+  const std::string images_path = CreateTempDirAtCWD();
+
   SapiLodepngSandbox sandbox(images_path);
   ASSERT_THAT(sandbox.Init(), IsOk()) << "Error during sandbox init";
   LodepngApi api(&sandbox);
 
   // generate the values
-  constexpr unsigned int width = 512, height = 512,
-                         img_len = width * height * 4;
-  std::vector<unsigned char> image(img_len);
-
-  for (int y = 0; y < height; ++y) {
-    for (int x = 0; x < width; ++x) {
-      image[4 * width * y + 4 * x + 0] = 255 * !(x & y);
-      image[4 * width * y + 4 * x + 1] = x ^ y;
-      image[4 * width * y + 4 * x + 2] = x | y;
-      image[4 * width * y + 4 * x + 3] = 255;
-    }
-  }
+  std::vector<uint8_t> image(GenerateValues());
 
   // encode the image into memory first
-  sapi::v::Array<unsigned char> sapi_image(image.data(), img_len);
-  sapi::v::UInt sapi_width(width), sapi_height(height);
+  sapi::v::Array<uint8_t> sapi_image(image.data(), kImgLen);
   sapi::v::ConstCStr sapi_filename("/output/out_generated2.png");
 
   sapi::v::ULLong sapi_pngsize;
-  sapi::v::IntBase<unsigned char *> sapi_png_ptr(0);
+  sapi::v::IntBase<uint8_t *> sapi_png_ptr(0);
 
   // encode it into memory
   SAPI_ASSERT_OK_AND_ASSIGN(
       unsigned int result,
       api.lodepng_encode32(sapi_png_ptr.PtrBoth(), sapi_pngsize.PtrBoth(),
-                           sapi_image.PtrBefore(), sapi_width.GetValue(),
-                           sapi_height.GetValue()));
+                           sapi_image.PtrBefore(), kWidth, kHeight));
 
   ASSERT_THAT(result, Eq(0)) << "Result from encode32 call not 0";
 
   // the new array (pointed to by sapi_png_ptr) is allocated
   // inside the sandboxed process so we need to transfer it to this
   // process
-  sapi::v::RemotePtr sapi_remote_out_ptr(sapi_png_ptr.GetValue());
-  sapi::v::Array<unsigned char> sapi_png_array(sapi_pngsize.GetValue());
-
-  sapi_png_array.SetRemote(sapi_remote_out_ptr.GetValue());
+  sapi::v::Array<uint8_t> sapi_png_array(sapi_pngsize.GetValue());
+  sapi_png_array.SetRemote(sapi_png_ptr.GetValue());
 
   ASSERT_THAT(sandbox.TransferFromSandboxee(&sapi_png_array), IsOk())
       << "Error during transfer from sandboxee";
@@ -168,7 +155,7 @@ TEST(generate_image, encode_decode_compare_two_steps) {
 
   // now, decode the image using the 2 steps in order to compare the values
   sapi::v::UInt sapi_width2, sapi_height2;
-  sapi::v::IntBase<unsigned char *> sapi_png_ptr2(0);
+  sapi::v::IntBase<uint8_t *> sapi_png_ptr2(0);
   sapi::v::ULLong sapi_pngsize2;
 
   // load the file in memory
@@ -183,17 +170,15 @@ TEST(generate_image, encode_decode_compare_two_steps) {
       << "Png sizes differ";
 
   // transfer the png array
-  sapi::v::RemotePtr sapi_remote_out_ptr2(sapi_png_ptr2.GetValue());
-  sapi::v::Array<unsigned char> sapi_png_array2(sapi_pngsize2.GetValue());
-
-  sapi_png_array2.SetRemote(sapi_remote_out_ptr2.GetValue());
+  sapi::v::Array<uint8_t> sapi_png_array2(sapi_pngsize2.GetValue());
+  sapi_png_array2.SetRemote(sapi_png_ptr2.GetValue());
 
   ASSERT_THAT(sandbox.TransferFromSandboxee(&sapi_png_array2), IsOk())
       << "Error during transfer from sandboxee";
 
   // after the file is loaded, decode it so we have access to the values
   // directly
-  sapi::v::IntBase<unsigned char *> sapi_png_ptr3(0);
+  sapi::v::IntBase<uint8_t *> sapi_png_ptr3(0);
   SAPI_ASSERT_OK_AND_ASSIGN(
       result,
       api.lodepng_decode32(sapi_png_ptr3.PtrBoth(), sapi_width2.PtrBoth(),
@@ -202,24 +187,23 @@ TEST(generate_image, encode_decode_compare_two_steps) {
 
   ASSERT_THAT(result, Eq(0)) << "Result from decode32 call not 0";
 
-  EXPECT_THAT(sapi_width2.GetValue(), Eq(width)) << "Widths differ";
-  EXPECT_THAT(sapi_height2.GetValue(), Eq(height)) << "Heights differ";
+  EXPECT_THAT(sapi_width2.GetValue(), Eq(kWidth)) << "Widths differ";
+  EXPECT_THAT(sapi_height2.GetValue(), Eq(kHeight)) << "Heights differ";
 
   // transfer the pixels so they can be used
-  sapi::v::RemotePtr sapi_remote_out_ptr3(sapi_png_ptr3.GetValue());
-  sapi::v::Array<unsigned char> sapi_pixels(img_len);
-
-  sapi_pixels.SetRemote(sapi_remote_out_ptr3.GetValue());
+  sapi::v::Array<uint8_t> sapi_pixels(kImgLen);
+  sapi_pixels.SetRemote(sapi_png_ptr3.GetValue());
 
   ASSERT_THAT(sandbox.TransferFromSandboxee(&sapi_pixels), IsOk())
       << "Error during transfer from sandboxee";
 
-  unsigned char *pixels_ptr = sapi_pixels.GetData();
+  // now we can compare values
+  EXPECT_THAT(std::equal(image.begin(), image.end(), sapi_pixels.GetData()),
+              IsTrue())
+      << "values differ";
 
-  // compare values
-  for (size_t i = 0; i < img_len; ++i) {
-    EXPECT_THAT(pixels_ptr[i], Eq(image[i])) << "Pixel values differ";
-  }
+  ASSERT_THAT(sandbox2::file_util::fileops::DeleteRecursively(images_path),
+              IsTrue());
 }
 
 }  // namespace

oss-internship-2020/sapi_lodepng/examples/main_unsandboxed.cc

@@ -12,111 +12,96 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include <cassert>
-#include <filesystem>
+#include <glog/logging.h>
+
 #include <iostream>
 
 #include "../lodepng/lodepng.h"
+#include "helpers.h"
+#include "sandboxed_api/sandbox2/util/fileops.h"
 
-void generate_one_step(const std::string &images_path) {
-  constexpr unsigned int width = 512, height = 512,
-                         img_len = width * height * 4;
-  std::vector<unsigned char> image(img_len);
-
-  for (int y = 0; y < height; ++y) {
-    for (int x = 0; x < width; ++x) {
-      image[4 * width * y + 4 * x + 0] = 255 * !(x & y);
-      image[4 * width * y + 4 * x + 1] = x ^ y;
-      image[4 * width * y + 4 * x + 2] = x | y;
-      image[4 * width * y + 4 * x + 3] = 255;
-    }
-  }
+void EncodeDecodeOneStep(const std::string &images_path) {
+  // generate the values
+  std::vector<uint8_t> image(GenerateValues());
 
   // encode the image
   const std::string filename = images_path + "/out_generated1.png";
   unsigned int result =
-      lodepng_encode32_file(filename.c_str(), image.data(), width, height);
+      lodepng_encode32_file(filename.c_str(), image.data(), kWidth, kHeight);
 
-  assert(!result);
+  CHECK(!result);
 
   // after the image has been encoded, decode it to check that the
   // pixel values are the same
 
   unsigned int width2, height2;
-  unsigned char *image2 = 0;
+  uint8_t *image2 = 0;
 
   result = lodepng_decode32_file(&image2, &width2, &height2, filename.c_str());
 
-  assert(!result);
+  CHECK(!result);
 
-  assert(width2 == width);
-  assert(height2 == height);
+  CHECK(width2 == kWidth);
+  CHECK(height2 == kHeight);
 
   // now, we can compare the values
-  for (size_t i = 0; i < img_len; ++i) {
-    assert(image2[i] == image[i]);
-  }
+  CHECK(std::equal(image.begin(), image.end(), image2));
+  free(image2);
 }
 
-void generate_two_steps(const std::string &images_path) {
+void EncodeDecodeTwoSteps(const std::string &images_path) {
   // generate the values
-  constexpr unsigned int width = 512, height = 512,
-                         img_len = width * height * 4;
-  std::vector<unsigned char> image(img_len);
-
-  for (int y = 0; y < height; ++y) {
-    for (int x = 0; x < width; ++x) {
-      image[4 * width * y + 4 * x + 0] = 255 * !(x & y);
-      image[4 * width * y + 4 * x + 1] = x ^ y;
-      image[4 * width * y + 4 * x + 2] = x | y;
-      image[4 * width * y + 4 * x + 3] = 255;
-    }
-  }
+  std::vector<uint8_t> image(GenerateValues());
 
   // encode the image into memory first
   const std::string filename = images_path + "/out_generated2.png";
-  unsigned char *png;
+  uint8_t *png;
   size_t pngsize;
 
   unsigned int result =
-      lodepng_encode32(&png, &pngsize, image.data(), width, height);
+      lodepng_encode32(&png, &pngsize, image.data(), kWidth, kHeight);
 
-  assert(!result);
+  CHECK(!result);
 
   // write the image into the file (from memory)
   result = lodepng_save_file(png, pngsize, filename.c_str());
 
-  assert(!result);
+  CHECK(!result);
 
   // now, decode the image using the 2 steps in order to compare the values
   unsigned int width2, height2;
-  unsigned char *png2;
+  uint8_t *png2;
   size_t pngsize2;
 
   // load the file in memory
   result = lodepng_load_file(&png2, &pngsize2, filename.c_str());
 
-  assert(!result);
-  assert(pngsize == pngsize2);
+  CHECK(!result);
+  CHECK(pngsize == pngsize2);
 
-  unsigned char *image2;
+  uint8_t *image2;
   result = lodepng_decode32(&image2, &width2, &height2, png2, pngsize2);
 
-  assert(!result);
-  assert(width2 == width);
-  assert(height2 == height);
+  CHECK(!result);
+  CHECK(width2 == kWidth);
+  CHECK(height2 == kHeight);
 
   // compare values
-  for (size_t i = 0; i < img_len; ++i) {
-    assert(image2[i] == image[i]);
-  }
+  CHECK(std::equal(image.begin(), image.end(), image2));
+  free(png);
+  free(png2);
+  free(image2);
 }
 
 int main(int argc, char *argv[]) {
-  const std::string images_path = std::filesystem::current_path().string();
+  google::InitGoogleLogging(argv[0]);
 
-  generate_one_step(images_path);
-  generate_two_steps(images_path);
+  const std::string images_path = CreateTempDirAtCWD();
+
+  EncodeDecodeOneStep(images_path);
+  EncodeDecodeTwoSteps(images_path);
+
+  CHECK(sandbox2::file_util::fileops::DeleteRecursively(images_path));
 
   return EXIT_SUCCESS;
 }

oss-internship-2020/sapi_lodepng/examples/sandbox.h

@@ -24,6 +24,7 @@ class SapiLodepngSandbox : public LodepngSandbox {
   SapiLodepngSandbox(const std::string &images_path)
       : images_path_(images_path) {}
 
+ private:
   std::unique_ptr<sandbox2::Policy> ModifyPolicy(
       sandbox2::PolicyBuilder *) override {
     return sandbox2::PolicyBuilder()
@@ -42,7 +43,6 @@ class SapiLodepngSandbox : public LodepngSandbox {
         .BuildOrDie();
   }
 
- private:
   const std::string images_path_;
 };