Restrict to one open file of each type at a time
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60a0daa82e
commit
2f23dd3348
@ -11,6 +11,8 @@ var (
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ErrFileWriteOnly = errors.New("file is write only")
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ErrInvalidOffset = errors.New("invalid file offset")
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ErrOffsetChanged = errors.New("offset has already been changed")
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ErrReadOpen = errors.New("only one file can be opened for reading at a time")
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ErrWriteOpen = errors.New("only one file can be opened for writing at a time")
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)
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// FSError represents an error returned by BLE FS
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@ -24,6 +24,10 @@ type File struct {
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// Open opens a file and returns it as an fs.File to
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// satisfy the fs.FS interface
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func (blefs *FS) Open(path string) (*File, error) {
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if blefs.readOpen {
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return nil, ErrReadOpen
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}
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blefs.readOpen = true
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// Make a read file request. This opens the file for reading.
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err := blefs.request(
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FSCmdReadFile,
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@ -49,6 +53,10 @@ func (blefs *FS) Open(path string) (*File, error) {
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// Create makes a new file on the BLE file system and returns it.
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func (blefs *FS) Create(path string, size uint32) (*File, error) {
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if blefs.writeOpen {
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return nil, ErrWriteOpen
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}
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blefs.writeOpen = true
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// Make a write file request. This will create and open a file for writing.
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err := blefs.request(
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FSCmdWriteFile,
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@ -316,9 +324,14 @@ func (fl *File) Seek(offset int64, whence int) (int64, error) {
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return int64(newOffset), nil
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}
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// Close implements the fs.File interface.
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// It just returns nil.
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// Close must be called before opening another file
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func (fl *File) Close() error {
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if fl.isReadOnly {
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fl.fs.readOpen = false
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} else if fl.isWriteOnly {
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fl.fs.writeOpen = false
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}
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return nil
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}
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@ -50,6 +50,8 @@ var btOptsCmd = map[string]interface{}{"type": "command"}
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type FS struct {
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transferChar *gatt.GattCharacteristic1
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transferRespCh <-chan *bluez.PropertyChanged
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readOpen bool
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writeOpen bool
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}
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// New creates a new fs given the transfer characteristic
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