mmyster/feature/file system kit/tell

include/interface/platform/File.h

@@ -34,6 +34,8 @@ struct File {
 
 	virtual auto size() -> size_t = 0;
 
+	virtual auto tell() -> size_t = 0;
+
 	[[nodiscard]] virtual auto is_open() const -> bool = 0;
 };
 

libs/FileSystemKit/include/FileSystemKit.h

@@ -38,6 +38,8 @@ class FileSystemKit
 		void rewind() final;
 		auto size() -> size_t final;
 
+		auto tell() -> size_t final;
+
 		[[nodiscard]] auto is_open() const -> bool final;
 
 	  private:

libs/FileSystemKit/source/File.cpp

@@ -102,3 +102,11 @@ auto FileSystemKit::File::is_open() const -> bool
 {
 	return _file != nullptr;
 }
+
+auto FileSystemKit::File::tell() -> size_t
+{
+	if (_file == nullptr) {
+		return 0;
+	}
+	return std::ftell(_file.get());
+}

libs/FileSystemKit/tests/File_test.cpp

@@ -441,3 +441,29 @@ TEST_F(FileTest, seek)
 	ASSERT_EQ(3, bytes_read);
 	ASSERT_EQ(expected_data, output_data);
 }
+
+TEST_F(FileTest, tellNoFile)
+{
+	auto pos = file.tell();
+	ASSERT_EQ(0, pos);
+}
+
+TEST_F(FileTest, tellEmptyFile)
+{
+	file.open(tempFilename);
+	auto pos = file.tell();
+	ASSERT_EQ(0, pos);
+}
+
+TEST_F(FileTest, tellFile)
+{
+	auto input_data = std::to_array<uint8_t>({0x61, 0x62, 0x63, 0x64, 0x65, 0x66});	  // "abcdef"
+
+	file.open(tempFilename, "w");
+	file.write(input_data);
+	file.seek(3);
+
+	auto actual_pos = file.tell();
+
+	ASSERT_EQ(3, actual_pos);
+}

spikes/lk_filesystem_kit/main.cpp

@@ -89,7 +89,7 @@ auto main() -> int
 		log_info("Data : %s", buffer.data());
 
 		file.seek(seek_temp);
-		log_info("Position indicator set to %d", seek_temp);
+		log_info("Position indicator set to %d", file.tell());
 		log_info("Reading...");
 		if (auto bytes = file.read(buffer); bytes != (size - seek_temp)) {
 			log_error("Fail to read file");