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add Decoder constructor with magic database file #27

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add Decoder constructor with magic database file #27

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0fdbb80
add Decoder constructor with magic database file
Oct 14, 2016
adda3df
Update magicmime.go
SuperGod Apr 18, 2017
7ef5e55
Update magicmime.go
SuperGod Apr 18, 2017
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27 changes: 26 additions & 1 deletion magicmime.go
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@
// See the License for the specific language governing permissions and
// limitations under the License.

// +build linux darwin
// +build linux darwin windows

// Package magicmime detects mimetypes using libmagic.
// This package requires libmagic, install it by the following
Expand Down Expand Up @@ -143,6 +143,31 @@ func NewDecoder(flags Flag) (*Decoder, error) {
return d, nil
}

// NewDecoderWithMagicDB creates a detector with the magic database file and the specified flags. Upon
// success users are expected to call Close on the returned Decoder
// when it is no longer needed.
func NewDecoderWithMagicDB(flags Flag, magicDB string) (*Decoder, error) {
db := C.magic_open(C.int(0))
if db == nil {
return nil, errors.New("error opening magic")
}
d := &Decoder{db: db}
var err error
if code := C.magic_setflags(db, C.int(flags)); code != 0 {
err = errors.New(C.GoString(C.magic_error(d.db)))
d.Close()
return nil, err
}
path := C.CString(magicDB)
defer C.free(unsafe.Pointer(path))
if code := C.magic_load(db, path); code != 0 {
err = errors.New(C.GoString(C.magic_error(d.db)))
d.Close()
return nil, err
}
return d, nil
}

// TypeByFile looks up for a file's mimetype by its content.
// It uses a magic number database which is described in magic(5).
func (d *Decoder) TypeByFile(filename string) (string, error) {
Expand Down