| // Copyright 2018 Google Inc. |
| // |
| // 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 "tink/util/file_input_stream.h" |
| |
| #include <fcntl.h> |
| #include <unistd.h> |
| #include <vector> |
| |
| #include "gtest/gtest.h" |
| #include "absl/memory/memory.h" |
| #include "absl/strings/string_view.h" |
| #include "tink/subtle/random.h" |
| #include "tink/util/test_util.h" |
| |
| namespace crypto { |
| namespace tink { |
| namespace { |
| |
| // Creates a new test file with the specified 'filename', writes 'size' random |
| // bytes to the file, and returns a file descriptor for reading from the file. |
| // A copy of the bytes written to the file is returned in 'file_contents'. |
| int GetTestFileDescriptor( |
| absl::string_view filename, int size, std::string* file_contents) { |
| std::string full_filename = |
| absl::StrCat(crypto::tink::test::TmpDir(), "/", filename); |
| (*file_contents) = subtle::Random::GetRandomBytes(size); |
| mode_t mode = S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH; |
| int fd = open(full_filename.c_str(), O_WRONLY | O_CREAT | O_TRUNC, mode); |
| if (fd == -1) { |
| std::clog << "Cannot create file " << full_filename |
| << " error: " << errno << std::endl; |
| exit(1); |
| } |
| if (write(fd, file_contents->data(), size) != size) { |
| std::clog << "Failed to write " << size << " bytes to file " |
| << full_filename << " error: " << errno << std::endl; |
| |
| exit(1); |
| } |
| close(fd); |
| fd = open(full_filename.c_str(), O_RDONLY); |
| if (fd == -1) { |
| std::clog << "Cannot re-open file " << full_filename |
| << " error: " << errno << std::endl; |
| exit(1); |
| } |
| return fd; |
| } |
| |
| // Reads the specified 'input_stream' until no more bytes can be read, |
| // and puts the read bytes into 'contents'. |
| // Returns the status of the last input_stream->Next()-operation. |
| util::Status ReadTillEnd(util::FileInputStream* input_stream, |
| std::string* contents) { |
| contents->clear(); |
| const void* buffer; |
| auto next_result = input_stream->Next(&buffer); |
| while (next_result.ok()) { |
| contents->append(static_cast<const char*>(buffer), |
| next_result.ValueOrDie()); |
| next_result = input_stream->Next(&buffer); |
| } |
| return next_result.status(); |
| } |
| |
| class FileInputStreamTest : public ::testing::Test { |
| }; |
| |
| TEST_F(FileInputStreamTest, testReadingStreams) { |
| std::vector<int> stream_sizes = {0, 10, 100, 1000, 10000, 100000, 1000000}; |
| for (auto stream_size : stream_sizes) { |
| std::string file_contents; |
| std::string filename = absl::StrCat(stream_size, "_reading_test.bin"); |
| int input_fd = GetTestFileDescriptor(filename, stream_size, &file_contents); |
| EXPECT_EQ(stream_size, file_contents.size()); |
| auto input_stream = absl::make_unique<util::FileInputStream>(input_fd); |
| std::string stream_contents; |
| auto status = ReadTillEnd(input_stream.get(), &stream_contents); |
| EXPECT_EQ(util::error::OUT_OF_RANGE, status.error_code()); |
| EXPECT_EQ("EOF", status.error_message()); |
| EXPECT_EQ(file_contents, stream_contents); |
| } |
| } |
| |
| TEST_F(FileInputStreamTest, testCustomBufferSizes) { |
| std::vector<int> buffer_sizes = {1, 10, 100, 1000, 10000}; |
| int stream_size = 100000; |
| for (auto buffer_size : buffer_sizes) { |
| std::string file_contents; |
| std::string filename = absl::StrCat(buffer_size, "_buffer_size_test.bin"); |
| int input_fd = GetTestFileDescriptor(filename, stream_size, &file_contents); |
| EXPECT_EQ(stream_size, file_contents.size()); |
| auto input_stream = |
| absl::make_unique<util::FileInputStream>(input_fd, buffer_size); |
| const void* buffer; |
| auto next_result = input_stream->Next(&buffer); |
| EXPECT_TRUE(next_result.ok()) << next_result.status(); |
| EXPECT_EQ(buffer_size, next_result.ValueOrDie()); |
| EXPECT_EQ(file_contents.substr(0, buffer_size), |
| std::string(static_cast<const char*>(buffer), buffer_size)); |
| } |
| } |
| |
| TEST_F(FileInputStreamTest, testBackupAndPosition) { |
| int stream_size = 100000; |
| int buffer_size = 1234; |
| const void* buffer; |
| std::string file_contents; |
| std::string filename = absl::StrCat(buffer_size, "_backup_test.bin"); |
| int input_fd = GetTestFileDescriptor(filename, stream_size, &file_contents); |
| EXPECT_EQ(stream_size, file_contents.size()); |
| |
| // Prepare the stream and do the first call to Next(). |
| auto input_stream = |
| absl::make_unique<util::FileInputStream>(input_fd, buffer_size); |
| EXPECT_EQ(0, input_stream->Position()); |
| auto next_result = input_stream->Next(&buffer); |
| EXPECT_TRUE(next_result.ok()) << next_result.status(); |
| EXPECT_EQ(buffer_size, next_result.ValueOrDie()); |
| EXPECT_EQ(buffer_size, input_stream->Position()); |
| EXPECT_EQ(file_contents.substr(0, buffer_size), |
| std::string(static_cast<const char*>(buffer), buffer_size)); |
| |
| // BackUp several times, but in total fewer bytes than returned by Next(). |
| std::vector<int> backup_sizes = {0, 1, 5, 0, 10, 100, -42, 400, 20, -100}; |
| int total_backup_size = 0; |
| for (auto backup_size : backup_sizes) { |
| input_stream->BackUp(backup_size); |
| total_backup_size += std::max(0, backup_size); |
| EXPECT_EQ(buffer_size - total_backup_size, input_stream->Position()); |
| } |
| // Call Next(), it should return exactly the backed up bytes. |
| next_result = input_stream->Next(&buffer); |
| EXPECT_TRUE(next_result.ok()) << next_result.status(); |
| EXPECT_EQ(total_backup_size, next_result.ValueOrDie()); |
| EXPECT_EQ(buffer_size, input_stream->Position()); |
| EXPECT_EQ( |
| file_contents.substr(buffer_size - total_backup_size, total_backup_size), |
| std::string(static_cast<const char*>(buffer), total_backup_size)); |
| |
| // BackUp() some bytes, again fewer than returned by Next(). |
| backup_sizes = {0, 72, -94, 37, 82}; |
| total_backup_size = 0; |
| for (auto backup_size : backup_sizes) { |
| input_stream->BackUp(backup_size); |
| total_backup_size += std::max(0, backup_size); |
| EXPECT_EQ(buffer_size - total_backup_size, input_stream->Position()); |
| } |
| |
| // Call Next(), it should return exactly the backed up bytes. |
| next_result = input_stream->Next(&buffer); |
| EXPECT_TRUE(next_result.ok()) << next_result.status(); |
| EXPECT_EQ(total_backup_size, next_result.ValueOrDie()); |
| EXPECT_EQ(buffer_size, input_stream->Position()); |
| EXPECT_EQ( |
| file_contents.substr(buffer_size - total_backup_size, total_backup_size), |
| std::string(static_cast<const char*>(buffer), total_backup_size)); |
| |
| // Call Next() again, it should return the second block. |
| next_result = input_stream->Next(&buffer); |
| EXPECT_TRUE(next_result.ok()) << next_result.status(); |
| EXPECT_EQ(buffer_size, next_result.ValueOrDie()); |
| EXPECT_EQ(2 * buffer_size, input_stream->Position()); |
| EXPECT_EQ( |
| file_contents.substr(buffer_size, buffer_size), |
| std::string(static_cast<const char*>(buffer), buffer_size)); |
| |
| // BackUp a few times, with total over the returned buffer_size. |
| backup_sizes = {0, 72, -100, buffer_size/2, 200, -25, buffer_size, 42}; |
| total_backup_size = 0; |
| for (auto backup_size : backup_sizes) { |
| input_stream->BackUp(backup_size); |
| total_backup_size = std::min(buffer_size, |
| total_backup_size + std::max(0, backup_size)); |
| EXPECT_EQ(2 * buffer_size - total_backup_size, input_stream->Position()); |
| } |
| |
| // Call Next() again, it should return the second block. |
| next_result = input_stream->Next(&buffer); |
| EXPECT_TRUE(next_result.ok()) << next_result.status(); |
| EXPECT_EQ(buffer_size, next_result.ValueOrDie()); |
| EXPECT_EQ(2 * buffer_size, input_stream->Position()); |
| EXPECT_EQ( |
| file_contents.substr(buffer_size, buffer_size), |
| std::string(static_cast<const char*>(buffer), buffer_size)); |
| } |
| |
| } // namespace |
| } // namespace tink |
| } // namespace crypto |