func magicOpen() (C.magic_t, error) {
magic, err := C.magic_open(C.MAGIC_MIME_TYPE)
if err != nil {
return nil, err
}
if magic == nil {
err = magicError(magic)
if err == nil {
panic("unreachable")
}
return nil, err
}
// magic_load set ENOENT, even if it succeed,
// so ignore second value.
code, _ := C.magic_load(magic, nil)
if int(code) != 0 {
err = magicError(magic)
if err == nil {
panic("unreachable")
}
return nil, err
}
return magic, nil
}
func New() (*Magic, error) {
db := C.magic_open(C.int(0))
C.magic_setflags(db, C.int(C.MAGIC_SYMLINK|C.MAGIC_ERROR))
if code := C.magic_load(db, nil); code != 0 {
return nil, errors.New(C.GoString(C.magic_error(db)))
}
return &Magic{db}, nil
}
// Load must be used to load the the colon separated list of database files
// passed in as filename, or "" for the default database file before any
// magic queries can performed.
func (m *Magic) Load(file string) error {
if m.ptr == nil {
return ConnectionError
}
cf := C.CString(file)
defer C.free(unsafe.Pointer(cf))
C.magic_load(m.ptr, cf)
return m.check()
}
// Load must be used to load database files before any magic queries can
// be performed.
//
// We expect either a colon separated list of database file paths, or an
// empty string ("") to use the default, system-installed database.
func (m *Magic) Load(file string) error {
if m.ptr == nil {
return ConnectionError
}
var cf *C.char
if file != "" {
cf = C.CString(file)
defer C.free(unsafe.Pointer(cf))
}
C.magic_load(m.ptr, cf)
return m.check()
}
func New(flags MagicFlag) (*Magic, error) {
db := C.magic_open(C.int(0))
if db == nil {
return nil, errors.New("Error allocating magic cookie")
}
if code := C.magic_setflags(db, C.int(flags)); code != 0 {
return nil, errors.New(C.GoString(C.magic_error(db)))
}
if code := C.magic_load(db, nil); code != 0 {
return nil, errors.New(C.GoString(C.magic_error(db)))
}
return &Magic{db}, nil
}
func Open(flags MagicFlag) error {
db = C.magic_open(C.int(0))
if db == nil {
return errors.New("error opening magic")
}
if code := C.magic_setflags(db, C.int(flags)); code != 0 {
return errors.New(C.GoString(C.magic_error(db)))
}
if code := C.magic_load(db, nil); code != 0 {
return errors.New(C.GoString(C.magic_error(db)))
}
return nil
}
// NewDecoder creates a detector that uses libmagic. It initializes
// the opens the magicmime database with the specified flags. Upon
// success users are expected to call Close on the returned Decoder
// when it is no longer needed.
func NewDecoder(flags Flag) (*Decoder, error) {
db := C.magic_open(C.int(0))
if db == nil {
return nil, errors.New("error opening magic")
}
d := &Decoder{db: db}
if code := C.magic_setflags(db, C.int(flags)); code != 0 {
d.Close()
return nil, errors.New(C.GoString(C.magic_error(d.db)))
}
if code := C.magic_load(db, nil); code != 0 {
d.Close()
return nil, errors.New(C.GoString(C.magic_error(d.db)))
}
return d, nil
}
