File System

Table of Contents

• Features
• Status
• Description
• Path
  • Path::isAbsolute
  • Path::dirname
  • Path::basename
  • Path::parseNameExtension
  • Path::normalize
  • Path::relativeFromTo
• FileSystem
  • copyFile
  • copyDirectory
  • removeDirectoryRecursive
  • makeDirectoryRecursive
  • existsAndIsFile
  • existsAndIsDirectory
  • write
  • read
• Roadmap

🟩 File System operations { exists | copy | delete } for { files | directories }

FileSystem executed executing operations on files and directories.
Path is able to parse and manipulate windows and posix paths.

Features

SC::Path	Represents a posix or windows file system path.
SC::Path::join	Joins multiple StringView with a Separator into an output String.
SC::Path::parseNameExtension	Splits a StringView of type "name.ext" into "name" and "ext".
SC::Path::parse	Splits a Posix or Windows path into a ParsedView.
SC::Path::dirname	Returns the directory name of a path.
SC::Path::basename	Returns the base name of a path.
SC::Path::isAbsolute	Checks if a path is absolute.
SC::Path::normalize	Resolves all .. to output a normalized path String.
SC::Path::relativeFromTo	Get relative path that appended to source resolves to destination.
SC::Path::append	Append to an existing path a series of StringView with a separator.
SC::Path::endsWithSeparator	Check if the path ends with a Windows or Posix separator.
SC::Path::removeStartingSeparator	Return a path without its (potential) starting separator.

SC::FileSystem	Execute fs operations { exists | copy | delete } for { files | directories }.
Copy Files
SC::FileSystem::copyFile	Copy a single file.
Delete Files
SC::FileSystem::removeFile	Remove a single file.
SC::FileSystem::removeFileIfExists	Remove a single file, giving no error if it doesn't exist.
Copy Directories
SC::FileSystem::copyDirectory	Copy a single directory.
Delete Directories
SC::FileSystem::removeEmptyDirectory	Removes an empty directory.
SC::FileSystem::removeEmptyDirectoryRecursive	Removes an empty directory that only contains other empty directories (but no files)
SC::FileSystem::removeDirectoryRecursive	Remove single directory with its entire content (like posix rm -rf)
Create Directories
SC::FileSystem::makeDirectory	Creates a new directory that does not already exist.
SC::FileSystem::makeDirectoryIfNotExists	Creates a new directory, if it doesn't already exists at the given path.
SC::FileSystem::makeDirectoryRecursive	Create a new directory, creating also intermediate non existing directories (like posix mkdir -p)
Check Existence
SC::FileSystem::exists	Check if a file or directory exists at a given path.
SC::FileSystem::existsAndIsFile	Check if a file exists at given path.
SC::FileSystem::existsAndIsDirectory	Check if a directory exists at given path.
Read / Change modification time
SC::FileSystem::getFileTime	Reads a FileTime structure for a given file.
SC::FileSystem::setLastModifiedTime	Change last modified time of a given file.

Miscellaneous Classes
SC::FileSystemDirectories	Reports location of system directories (executable / application root)

Status

🟩 Usable
The library contains commonly used function but it's missing some notable ones like stat. SC::FileSystem::getFileTime and SC::FileSystem::setLastModifiedTime will probably be refactored in a future dedicated class for handling stat based operations.

Description

SC::Path class allows parsing and manipulating windows and posix paths.

SC::FileSystem allows all typical file operations ( exists | copy | delete | make files or directory). Some less used functions are SC::FileSystem::getFileTime and SC::FileSystem::setLastModifiedTime . The library doesn't allow reading or writing seeking inside a file, as that is domain of the File library. SC::FileSystem::init needs an absolute path to a directory and makes it a the base directory. All paths passed later on as arguments to all methods can be either absolute paths or relative. If they are relative, they will be interpreted as relative to the base directory and NOT current directory of the process. The class wants explicitly to make sure its behavior doesn't implicitly depend on current directory of process (unless it's passed explicitly to SC::FileSystem::init of course).

Path

Path::isAbsolute

Checks if a path is absolute. For example:

Path::isAbsolute("/dirname/basename", Path::AsPosix) == true;        // Posix Absolute
Path::isAbsolute("./dirname/basename", Path::AsPosix) == false;      // Posix Relative
Path::isAbsolute("C:\\dirname\\basename", Path::AsWindows) == true;  // Windows with Drive
Path::isAbsolute("\\\\server\\dir", Path::AsWindows) == true;        // Windows with Network
Path::isAbsolute("\\\\?\\C:\\server\\dir", Path::AsWindows) == true; // Windows with Long
Path::isAbsolute("..\\dirname\\basename", Path::AsWindows) == false; // Windows relative

Parameters

[in]	input	The StringView with path to be parsed. Trailing separators are ignored.
[in]	type	Specify to parse as Windows or Posix path

Returns

true if input is absolute

Path::dirname

Returns the directory name of a path. Trailing separators are ignored.

For example:

Path::dirname("/dirname/basename", Path::AsPosix) == "/dirname";
Path::dirname("/dirname/basename//", Path::AsPosix) == "/dirname";
Path::dirname("C:\\dirname\\basename", Path::AsWindows) == "C:\\dirname";
Path::dirname("\\dirname\\basename\\\\", Path::AsWindows) == "\\dirname";

Parameters

[in]	input	The StringView with path to be parsed. Trailing separators are ignored.
[in]	type	Specify to parse as Windows or Posix path
	repeat	how many directory levels should be removed dirname("/1/2/3/4", repeat=1) == "/1/2"

Returns

Substring of input holding the directory name

Path::basename

Returns the base name of a path. Trailing separators are ignored.

For example:

Path::basename("/a/basename", Path::AsPosix) == "basename";
Path::basename("/a/basename//", Path::AsPosix) == "basename";

Parameters

[in]	input	The StringView with path to be parsed. Trailing separators are ignored.
[in]	type	Specify to parse as Windows or Posix path

Returns

Substring of input holding the base name

Path::parseNameExtension

Splits a StringView of type "name.ext" into "name" and "ext".

Parameters

[in]	input	An input path coded as UTF8 sequence (ex. "name.ext")
[out]	name	Output string holding name ("name" in "name.ext")
[out]	extension	Output string holding extension ("ext" in "name.ext")

Returns

false if both name and extension will be empty after trying to parse them

Example:

    SC_TEST_EXPECT(Path::parseNameExtension("name.ext", name, ext));
    SC_TEST_EXPECT(name == "name");
    SC_TEST_EXPECT(ext == "ext");
 
    SC_TEST_EXPECT(!Path::parseNameExtension("", name, ext));
    SC_TEST_EXPECT(name.isEmpty());
    SC_TEST_EXPECT(ext.isEmpty());
 
    SC_TEST_EXPECT(!Path::parseNameExtension(".", name, ext));
    SC_TEST_EXPECT(name.isEmpty());
    SC_TEST_EXPECT(ext.isEmpty());
 
    SC_TEST_EXPECT(Path::parseNameExtension(".ext", name, ext));
    SC_TEST_EXPECT(name.isEmpty());
    SC_TEST_EXPECT(ext == "ext");
 
    SC_TEST_EXPECT(Path::parseNameExtension("name.", name, ext));
    SC_TEST_EXPECT(name == "name");
    SC_TEST_EXPECT(ext.isEmpty());
 
    SC_TEST_EXPECT(Path::parseNameExtension("name.name.ext", name, ext));
    SC_TEST_EXPECT(name == "name.name");
    SC_TEST_EXPECT(ext == "ext");
 
    SC_TEST_EXPECT(Path::parseNameExtension("name..", name, ext));
    SC_TEST_EXPECT(name == "name.");
    SC_TEST_EXPECT(ext.isEmpty());

Path::normalize

Resolves all .. to output a normalized path String. For example:

Path::normalize("/Users/SC/../Documents/", cmp, &path, Path::AsPosix);
SC_RELEASE_ASSERT(path == "/Users/Documents");

Parameters

	view	The path to be normalized (but it should not be a view() of the output String)
	components	The parsed components that once joined will provide the normalized string
[out]	output	(Optional) pointer to String that will receive the normalized Path (if nullptr)
[in]	type	Specify to parse as Windows or Posix path

Returns

true if the Path was successfully parsed and normalized

Path::relativeFromTo

Get relative path that appended to source resolves to destination. For example:

Path::relativeFromTo("/a/b/1/2/3", "/a/b/d/e", path, Path::AsPosix, Path::AsPosix);
SC_TEST_ASSERT(path == "../../../d/e");

Parameters

[in]	source	The source Path
[in]	destination	The destination Path
[out]	output	The output relative path computed that transforms source into destination
[in]	type	Specify to parse as Windows or Posix path
[in]	outputType	Specify if the output relative path should be formatted as a Posix or Windows path

Returns

true if source and destination paths can be properly parsed as absolute paths

FileSystem

copyFile

Copy a single file.

Parameters

source	Source file path
destination	Destination file path
copyFlags	Copy flags (overwrite, use clone api etc.)

Returns

Valid Result if copy succeeded

Example:

    FileSystem fs;
    // Make all operations relative to applicationRootDirectory
    SC_TEST_EXPECT(fs.init(report.applicationRootDirectory));
 
    // Create a File names 'sourceFile.txt'
    StringView contentSource = "this is some content";
    SC_TEST_EXPECT(not fs.exists("sourceFile.txt"));
    SC_TEST_EXPECT(fs.writeString("sourceFile.txt", contentSource));
 
    // Check that 'sourceFile.txt' exist, but not 'destinationFile.txt'
    SC_TEST_EXPECT(fs.existsAndIsFile("sourceFile.txt"));
    SC_TEST_EXPECT(not fs.exists("destinationFile.txt"));
 
    // Ask to copy sourceFile.txt to destinationFile.txt (eventually overwriting, but without cloning)
    SC_TEST_EXPECT(fs.copyFile("sourceFile.txt", "destinationFile.txt",
                               FileSystem::CopyFlags().setOverwrite(true).setUseCloneIfSupported(false)));
 
    // Now read the destinationFile.txt content and check if it's the same as source
    String content;
    SC_TEST_EXPECT(fs.read("destinationFile.txt", content, StringEncoding::Ascii));
    SC_TEST_EXPECT(content.view() == contentSource);
 
    // Copy again sourceFile.txt to destinationFile.txt but using clone this time
    SC_TEST_EXPECT(fs.copyFile("sourceFile.txt", "destinationFile.txt",
                               FileSystem::CopyFlags().setOverwrite(true).setUseCloneIfSupported(true)));
 
    // Check again if file exists and its content
    SC_TEST_EXPECT(fs.existsAndIsFile("destinationFile.txt"));
    SC_TEST_EXPECT(fs.read("destinationFile.txt", content, StringEncoding::Ascii));
    SC_TEST_EXPECT(content.view() == contentSource);
 
    // Remove all files created by the test
    SC_TEST_EXPECT(fs.removeFiles({"sourceFile.txt", "destinationFile.txt"}));
    SC_TEST_EXPECT(not fs.exists("sourceFile.txt"));
    SC_TEST_EXPECT(not fs.exists("destinationFile.txt"));

copyDirectory

Copy a single directory.

Parameters

source	Source directory path
destination	Destination directory path
copyFlags	Copy flags (overwrite, use clone api etc.)

Returns

Valid Result if copy succeeded

Example:

    FileSystem fs;
    // Make all operations relative to applicationRootDirectory
    SC_TEST_EXPECT(fs.init(report.applicationRootDirectory));
 
    // Create a nested directory structure with some files too
    SC_TEST_EXPECT(fs.makeDirectory("copyDirectory"));
    SC_TEST_EXPECT(fs.write("copyDirectory/testFile.txt", "asdf"));
    SC_TEST_EXPECT(fs.existsAndIsFile("copyDirectory/testFile.txt"));
    SC_TEST_EXPECT(fs.makeDirectory("copyDirectory/subdirectory"));
    SC_TEST_EXPECT(fs.write("copyDirectory/subdirectory/testFile.txt", "asdf"));
 
    // Copy the directory (recursively)
    SC_TEST_EXPECT(fs.copyDirectory("copyDirectory", "COPY_copyDirectory"));
 
    // Check that file exists in the new copied directory
    SC_TEST_EXPECT(fs.existsAndIsFile("COPY_copyDirectory/testFile.txt"));
    SC_TEST_EXPECT(fs.existsAndIsFile("COPY_copyDirectory/subdirectory/testFile.txt"));
 
    // Copying again fails (because we're not overwriting)
    SC_TEST_EXPECT(not fs.copyDirectory("copyDirectory", "COPY_copyDirectory"));
 
    // Try copying again but now we ask to overwrite destination
    SC_TEST_EXPECT(fs.copyDirectory("copyDirectory", "COPY_copyDirectory", FileSystem::CopyFlags().setOverwrite(true)));
 
    // Remove all files created by the test
    SC_TEST_EXPECT(fs.removeFile("copyDirectory/testFile.txt"));
    SC_TEST_EXPECT(fs.removeFile("copyDirectory/subdirectory/testFile.txt"));
    SC_TEST_EXPECT(fs.removeEmptyDirectory("copyDirectory/subdirectory"));
    SC_TEST_EXPECT(fs.removeEmptyDirectory("copyDirectory"));
    SC_TEST_EXPECT(fs.removeFile("COPY_copyDirectory/testFile.txt"));
    SC_TEST_EXPECT(fs.removeFile("COPY_copyDirectory/subdirectory/testFile.txt"));
    SC_TEST_EXPECT(fs.removeEmptyDirectory("COPY_copyDirectory/subdirectory"));
    SC_TEST_EXPECT(fs.removeEmptyDirectory("COPY_copyDirectory"));

removeDirectoryRecursive

Remove single directory with its entire content (like posix rm -rf)

Parameters

directory

Directory to remove

Returns

Valid Result if directory contents has been successfully deleted

Example:

    FileSystem fs;
    // Make all operations relative to applicationRootDirectory
    SC_TEST_EXPECT(fs.init(report.applicationRootDirectory));
 
    // Create a nested directory structure with some files too
    SC_TEST_EXPECT(fs.makeDirectory("removeDirectoryTest"));
    SC_TEST_EXPECT(fs.write("removeDirectoryTest/testFile.txt", "asdf"));
    SC_TEST_EXPECT(fs.makeDirectory("removeDirectoryTest/another"));
    SC_TEST_EXPECT(fs.write("removeDirectoryTest/another/yeah.txt", "asdf"));
 
    // Remove the entire tree of directories
    SC_TEST_EXPECT(fs.removeDirectoryRecursive("removeDirectoryTest"));
 
    // Check that all files and directories have been removed
    SC_TEST_EXPECT(not fs.existsAndIsFile("removeDirectoryTest/testFile.txt"));
    SC_TEST_EXPECT(not fs.existsAndIsFile("removeDirectoryTest/another/yeah.txt"));
    SC_TEST_EXPECT(not fs.existsAndIsDirectory("removeDirectoryTest/another"));
    SC_TEST_EXPECT(not fs.existsAndIsDirectory("removeDirectoryTest"));

makeDirectoryRecursive

Create a new directory, creating also intermediate non existing directories (like posix mkdir -p)

Parameters

directory

Path where to create such directory

Returns

Invalid Result in case of I/O or access error

    FileSystem fs;
    // Make all operations relative to applicationRootDirectory
    SC_TEST_EXPECT(fs.init(report.applicationRootDirectory));
 
    // Create a directory with 2 levels of nesting
    SC_TEST_EXPECT(fs.makeDirectoryRecursive("Test3/Subdir"));
 
    // Check that both levels have been created
    SC_TEST_EXPECT(fs.existsAndIsDirectory("Test3"));
    SC_TEST_EXPECT(fs.existsAndIsDirectory("Test3/Subdir"));
 
    // Remove both levels of directory
    SC_TEST_EXPECT(fs.removeEmptyDirectoryRecursive("Test3/Subdir"));
 
    // Check that directory has been removed
    SC_TEST_EXPECT(not fs.existsAndIsDirectory("Test3"));

existsAndIsFile

Check if a file exists at given path.

Parameters

file	File path to check

Returns

true if a file exists at the given path

Example:

    FileSystem fs;
    // Make all operations relative to applicationRootDirectory
    SC_TEST_EXPECT(fs.init(report.applicationRootDirectory));
 
    // Create a File names 'sourceFile.txt'
    StringView contentSource = "this is some content";
    SC_TEST_EXPECT(not fs.exists("sourceFile.txt"));
    SC_TEST_EXPECT(fs.writeString("sourceFile.txt", contentSource));
 
    // Check that 'sourceFile.txt' exist, but not 'destinationFile.txt'
    SC_TEST_EXPECT(fs.existsAndIsFile("sourceFile.txt"));
    SC_TEST_EXPECT(not fs.exists("destinationFile.txt"));
 
    // Ask to copy sourceFile.txt to destinationFile.txt (eventually overwriting, but without cloning)
    SC_TEST_EXPECT(fs.copyFile("sourceFile.txt", "destinationFile.txt",
                               FileSystem::CopyFlags().setOverwrite(true).setUseCloneIfSupported(false)));
 
    // Now read the destinationFile.txt content and check if it's the same as source
    String content;
    SC_TEST_EXPECT(fs.read("destinationFile.txt", content, StringEncoding::Ascii));
    SC_TEST_EXPECT(content.view() == contentSource);
 
    // Copy again sourceFile.txt to destinationFile.txt but using clone this time
    SC_TEST_EXPECT(fs.copyFile("sourceFile.txt", "destinationFile.txt",
                               FileSystem::CopyFlags().setOverwrite(true).setUseCloneIfSupported(true)));
 
    // Check again if file exists and its content
    SC_TEST_EXPECT(fs.existsAndIsFile("destinationFile.txt"));
    SC_TEST_EXPECT(fs.read("destinationFile.txt", content, StringEncoding::Ascii));
    SC_TEST_EXPECT(content.view() == contentSource);
 
    // Remove all files created by the test
    SC_TEST_EXPECT(fs.removeFiles({"sourceFile.txt", "destinationFile.txt"}));
    SC_TEST_EXPECT(not fs.exists("sourceFile.txt"));
    SC_TEST_EXPECT(not fs.exists("destinationFile.txt"));

existsAndIsDirectory

Check if a directory exists at given path.

Parameters

directory

Directory path to check

Returns

true if a directory exists at the given path

write

Writes a block of memory to a file.

Parameters

file	Path to the file that is meant to be written
data	Block of memory to write

Returns

Valid Result if the memory was successfully written

Example:

    FileSystem fs;
    // Make all operations relative to applicationRootDirectory
    SC_TEST_EXPECT(fs.init(report.applicationRootDirectory));
    StringView content = "ASDF content";
 
    // Check that file doesn't exists before write-ing it and then check that it exist
    SC_TEST_EXPECT(not fs.exists("file.txt"));
    SC_TEST_EXPECT(fs.writeString("file.txt", content));
    SC_TEST_EXPECT(fs.existsAndIsFile("file.txt"));
 
    // Read the file and check its content
    String newString;
    SC_TEST_EXPECT(fs.read("file.txt", newString, StringEncoding::Ascii));
    SC_TEST_EXPECT(newString.view() == content);
 
    // Remove all files created by the test
    SC_TEST_EXPECT(fs.removeFile("file.txt"));
    SC_TEST_EXPECT(not fs.exists("file.txt"));

read

Reads contents of a file into a SC::Vector buffer.

Parameters

	file	Path to the file to read
[out]	data	Destination buffer that will receive data

Returns

Valid Result if file was fully read successfully

See also

write (for an usage example)

Roadmap

🟦 Complete Features:

• stat
• fstat
• rename
• chmod
• chown
• fsync
• link (hardlink)
• symlink
• sendfile

💡 Unplanned Features: There are many fs operations tat can be added

• fchmod
• fchown
• lchown
• access
• ftruncate
• lstat
• statfs
• fdatasync
• ftruncate
• readlink