codec

Documentation

Index

• func DecodeBytes(b []byte) ([]byte, []byte, error)
• func DecodeInt(b []byte) ([]byte, int64, error)
• type Key
  • func EncodeBytes(data []byte) Key
  • func (k Key) MetaOrTable() (bool, int64)
  • func (k Key) TableID() int64

Functions

func DecodeBytes

func DecodeBytes(b []byte) ([]byte, []byte, error)

DecodeBytes decodes bytes which is encoded by EncodeBytes before, returns the leftover bytes and decoded value if no error.

func DecodeInt

func DecodeInt(b []byte) ([]byte, int64, error)

DecodeInt decodes value encoded by EncodeInt before. It returns the leftover un-decoded slice, decoded value if no error.

Types

type Key

type Key []byte

Key represents high-level Key type.

func EncodeBytes

func EncodeBytes(data []byte) Key

EncodeBytes guarantees the encoded value is in ascending order for comparison, encoding with the following rule:

[group1][marker1]...[groupN][markerN]
group is 8 bytes slice which is padding with 0.
marker is `0xFF - padding 0 count`

For example:

[] -> [0, 0, 0, 0, 0, 0, 0, 0, 247]
[1, 2, 3] -> [1, 2, 3, 0, 0, 0, 0, 0, 250]
[1, 2, 3, 0] -> [1, 2, 3, 0, 0, 0, 0, 0, 251]
[1, 2, 3, 4, 5, 6, 7, 8] -> [1, 2, 3, 4, 5, 6, 7, 8, 255, 0, 0, 0, 0, 0, 0, 0, 0, 247]

Refer: https://github.com/facebook/mysql-5.6/wiki/MyRocks-record-format#memcomparable-format

func (Key) MetaOrTable

func (k Key) MetaOrTable() (bool, int64)

MetaOrTable checks if the key is a meta key or table key. If the key is a meta key, it returns true and 0. If the key is a table key, it returns false and table ID. Otherwise, it returns false and 0.

func (Key) TableID

func (k Key) TableID() int64

TableID returns the table ID of the key, if the key is not table key, returns 0.