DIR_READ_MODE = 0755
DIR_WRITE_MODE = 0777
FILE_READ_MODE = 0644
FILE_WRITE_MODE = 0666
FOPEN_READ = 'rb'
FOPEN_READ_WRITE = 'r+b'
FOPEN_READ_WRITE_CREATE = 'a+b'
FOPEN_READ_WRITE_CREATE_DESTRUCTIVE = 'w+b'
FOPEN_READ_WRITE_CREATE_STRICT = 'x+b'
FOPEN_WRITE_CREATE = 'ab'
FOPEN_WRITE_CREATE_DESTRUCTIVE = 'wb'
FOPEN_WRITE_CREATE_STRICT = 'xb'