memfile

type AppendableLookupFile ¶

type AppendableLookupFile interface {
	LookupFile
}

AppendableLookupFile is a LookupFile that may be optimized for the following scenario. The file typically grows by aggressive appending, one element at a time.

type AppendableLookupFileReadAll ¶ added in v0.0.22

type AppendableLookupFileReadAll interface {
	AppendableLookupFile
	ReadAll() ([]byte, error)
}

AppendableLookupFileReadAll adds the ability to read the whole file

func NewAppendOptimizedFile(file *os.File) (AppendableLookupFileReadAll, error)

type FileWithSize ¶ added in v0.0.7

type FileWithSize struct {
	// contains filtered or unexported fields
}

func NewFileWithSize(file *os.File) *FileWithSize

func (fws *FileWithSize) Close() error

func (fws *FileWithSize) ReadAll() ([]byte, error)

func (fws *FileWithSize) ReadAt(b []byte, off int64) (int, error)

func (fws *FileWithSize) Size() int64

func (fws *FileWithSize) Sync() error

func (fws *FileWithSize) WriteAt(p []byte, off int64) (int, error)

type LookupFile ¶

type LookupFile interface {
	io.ReaderAt
	io.WriterAt
	io.Closer
	Sync() error
}

LookupFile is a file-like array-like object. The file has array elements each a fixed number of bytes. Elements are written or read one at a time. By referring to io interfaces, we can arrange for os.File to be a naive non-optimized implementation.

type LookupFileWithSize ¶

type LookupFileWithSize interface {
	LookupFile
	Size() int64
}

type MmapReadOnly ¶ added in v0.0.24

type MmapReadOnly struct {
	// contains filtered or unexported fields
}

func NewMmapReadOnly(f *os.File) (*MmapReadOnly, error)

func (m *MmapReadOnly) Close() error

func (m *MmapReadOnly) ReadAll() ([]byte, error)

func (m *MmapReadOnly) ReadAt(p []byte, off int64) (n int, err error)

func (m *MmapReadOnly) Size() int64

func (m *MmapReadOnly) Sync() error

func (m *MmapReadOnly) WriteAt(p []byte, off int64) (n int, err error)

type SparseLookupFile ¶

type SparseLookupFile interface {
	LookupFile
}

SparseLookupFile is a LookupFile that may be optimized for the following scenario. The file is fixed size, and starts life full of zeros. Elements are written or read one at a time.

func NewFixedSizeMemFile(filename string, perm os.FileMode) (SparseLookupFile, error)