codec

func DecodeBytes ¶

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

DecodeBytes decodes bytes which is encoded by EncodeBytes before, returns the leftover bytes and decoded value if no error. `buf` is used to buffer data to avoid the cost of makeslice in decodeBytes when DecodeBytes is called by Decoder.DecodeOne.

func DecodeBytesDesc ¶

func DecodeBytesDesc(b []byte, buf []byte) ([]byte, []byte, error)

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

func DecodeCmpUintToInt ¶

func DecodeCmpUintToInt(u uint64) int64

DecodeCmpUintToInt decodes the u that encoded by EncodeIntToCmpUint

func DecodeCompactBytes ¶

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

DecodeCompactBytes decodes bytes which is encoded by EncodeCompactBytes before.

func DecodeComparableUvarint ¶

func DecodeComparableUvarint(b []byte) ([]byte, uint64, error)

DecodeComparableUvarint decodes mem-comparable uvarint.

func DecodeComparableVarint ¶

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

DecodeComparableVarint decodes mem-comparable varint.

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.

func DecodeIntDesc ¶

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

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

func DecodeUint ¶

func DecodeUint(b []byte) ([]byte, uint64, error)

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

func DecodeUintDesc ¶

func DecodeUintDesc(b []byte) ([]byte, uint64, error)

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

func DecodeUvarint ¶

func DecodeUvarint(b []byte) ([]byte, uint64, error)

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

func DecodeVarint ¶

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

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

func EncodeBytes ¶

func EncodeBytes(b []byte, data []byte) []byte

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 EncodeBytesDesc ¶

func EncodeBytesDesc(b []byte, data []byte) []byte

EncodeBytesDesc first encodes bytes using EncodeBytes, then bitwise reverses encoded value to guarantee the encoded value is in descending order for comparison.

func EncodeCompactBytes ¶

func EncodeCompactBytes(b []byte, data []byte) []byte

EncodeCompactBytes joins bytes with its length into a byte slice. It is more efficient in both space and time compare to EncodeBytes. Note that the encoded result is not memcomparable.

func EncodeComparableUvarint ¶

func EncodeComparableUvarint(b []byte, v uint64) []byte

EncodeComparableUvarint encodes uint64 into mem-comparable bytes.

func EncodeComparableVarint ¶

func EncodeComparableVarint(b []byte, v int64) []byte

EncodeComparableVarint encodes an int64 to a mem-comparable bytes.

func EncodeInt ¶

func EncodeInt(b []byte, v int64) []byte

EncodeInt appends the encoded value to slice b and returns the appended slice. EncodeInt guarantees that the encoded value is in ascending order for comparison.

func EncodeIntDesc ¶

func EncodeIntDesc(b []byte, v int64) []byte

EncodeIntDesc appends the encoded value to slice b and returns the appended slice. EncodeIntDesc guarantees that the encoded value is in descending order for comparison.

func EncodeIntToCmpUint ¶

func EncodeIntToCmpUint(v int64) uint64

EncodeIntToCmpUint make int v to comparable uint type

func EncodeUint ¶

func EncodeUint(b []byte, v uint64) []byte

EncodeUint appends the encoded value to slice b and returns the appended slice. EncodeUint guarantees that the encoded value is in ascending order for comparison.

func EncodeUintDesc ¶

func EncodeUintDesc(b []byte, v uint64) []byte

EncodeUintDesc appends the encoded value to slice b and returns the appended slice. EncodeUintDesc guarantees that the encoded value is in descending order for comparison.

func EncodeUvarint ¶

func EncodeUvarint(b []byte, v uint64) []byte

EncodeUvarint appends the encoded value to slice b and returns the appended slice. Note that the encoded result is not memcomparable.

func EncodeVarint ¶

func EncodeVarint(b []byte, v int64) []byte

EncodeVarint appends the encoded value to slice b and returns the appended slice. Note that the encoded result is not memcomparable.

func EncodedBytesLength ¶

func EncodedBytesLength(dataLen int) int

EncodedBytesLength returns the length of data after encoded