CopyFromReaderToDir copies file from src to dst where dst is the destination file path.

CopyToDir copies the src file to dst.

DetectFileType returns a file's content type given path.

IsRegularFile checks if path is a regular file.

ValidateSHA256Sum returns nil if SHA256 of file at path equals to checksum.

WriteFile writes to a path with all parent directories created.

WriteFileWithPermission writes to a path with all parent directories created.

256 MiB.