internal

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v0.0.0-...-8b3d7ad Latest Latest Go to latest Published: Feb 16, 2026 License: MIT Imports: 5 Imported by: 0

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github.com/ach968/alpine

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Documentation ¶

Index ¶

Constants
func ALPDecode(input []int64, exponent int) []float64
func ALPEncode(input []float64, exponent int) ([]int64, int, error)
func AutoRiceParam(deltas []int64) int
func DeltaDecode(deltas []int64, first int64, second int64) ([]int64, error)
func DeltaEncode(input []int64) (deltas []int64, first int64, second int64, err error)
func GolombRiceDecode(data []byte, bitCount int, valueCount int, m int) ([]uint64, error)
func SimpleDeltaDecode(deltas []int64, first int64) ([]int64, error)
func SimpleDeltaEncode(input []int64) (deltas []int64, first int64, err error)
func ZigZagDecode(input []uint64) ([]int64, error)
func ZigZagEncode(input []int64) ([]uint64, error)
type Header
- func Unmarshal(data []byte) (*Header, error)
- func (h *Header) Marshal() []byte
- func (h *Header) Validate() error
type Mode
- func ModeFromByte(b byte) Mode
- func (m Mode) Byte() byte
type PackedData
- func GolombRiceEncode(input []uint64, m int) (PackedData, error)

Constants ¶

View Source

const HeaderSize = 24

Variables ¶

This section is empty.

Functions ¶

func ALPDecode ¶

func ALPDecode(input []int64, exponent int) []float64

func ALPEncode ¶

func ALPEncode(input []float64, exponent int) ([]int64, int, error)

func AutoRiceParam ¶

func AutoRiceParam(deltas []int64) int

AutoRiceParam calculates the optimal Rice parameter for given data. Uses the median of absolute values as a heuristic, rounded to nearest power of 2. This provides good compression without requiring manual tuning.

func DeltaDecode ¶

func DeltaDecode(deltas []int64, first int64, second int64) ([]int64, error)

func DeltaEncode ¶

func DeltaEncode(input []int64) (deltas []int64, first int64, second int64, err error)

func GolombRiceDecode ¶

func GolombRiceDecode(data []byte, bitCount int, valueCount int, m int) ([]uint64, error)

func SimpleDeltaDecode ¶

func SimpleDeltaDecode(deltas []int64, first int64) ([]int64, error)

func SimpleDeltaEncode ¶

func SimpleDeltaEncode(input []int64) (deltas []int64, first int64, err error)

Returns deltas starting from idx 1. Faster than predictive delta but less effective for linear data.

func ZigZagDecode ¶

func ZigZagDecode(input []uint64) ([]int64, error)

func ZigZagEncode ¶

func ZigZagEncode(input []int64) ([]uint64, error)

Types ¶

type Header ¶

type Header struct {
	Mode       Mode
	RiceParam  int
	ALPExp     int
	First      int64
	Second     int64
	ValueCount int
}

func Unmarshal ¶

func Unmarshal(data []byte) (*Header, error)

func (h *Header) Marshal() []byte

func (h *Header) Validate() error

Validate checks if the header is valid

type Mode ¶

type Mode int

Mode represents the encoding strategy used

const (
	// ModeFloat uses ALP + Predictive Delta for float64 data
	ModeFloat Mode = iota

	// ModeInt uses simple delta: value[i] - value[i-1]
	// Best for: Monotonically increasing/decreasing integers
	ModeInt
)

func ModeFromByte ¶

func ModeFromByte(b byte) Mode

ModeFromByte converts a byte to Mode

func (Mode) Byte ¶

func (m Mode) Byte() byte

Byte returns the byte representation of Mode

type PackedData ¶

type PackedData struct {
	Data       []byte
	BitCount   int
	ValueCount int
}

PackedData holds the encoded byte data along with metadata needed for decoding

func GolombRiceEncode ¶

func GolombRiceEncode(input []uint64, m int) (PackedData, error)

Source Files ¶

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