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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
// Package byteops provides helper functions to (un-) marshal objects from or into a buffer
package byteops
import (
"encoding/binary"
"errors"
"math"
)
const (
uint64Len = 8
uint32Len = 4
uint16Len = 2
uint8Len = 1
)
type ReadWriter struct {
Position uint64
Buffer []byte
}
func WithPosition(pos uint64) func(*ReadWriter) {
return func(rw *ReadWriter) {
rw.Position = pos
}
}
func NewReadWriter(buf []byte, opts ...func(writer *ReadWriter)) ReadWriter {
rw := ReadWriter{Buffer: buf}
for _, opt := range opts {
opt(&rw)
}
return rw
}
func (bo *ReadWriter) ResetBuffer(buf []byte) {
bo.Buffer = buf
bo.Position = 0
}
func (bo *ReadWriter) ReadUint64() uint64 {
bo.Position += uint64Len
return binary.LittleEndian.Uint64(bo.Buffer[bo.Position-uint64Len : bo.Position])
}
func (bo *ReadWriter) ReadUint16() uint16 {
bo.Position += uint16Len
return binary.LittleEndian.Uint16(bo.Buffer[bo.Position-uint16Len : bo.Position])
}
func (bo *ReadWriter) ReadUint32() uint32 {
bo.Position += uint32Len
return binary.LittleEndian.Uint32(bo.Buffer[bo.Position-uint32Len : bo.Position])
}
func (bo *ReadWriter) ReadUint8() uint8 {
bo.Position += uint8Len
return bo.Buffer[bo.Position-uint8Len]
}
func (bo *ReadWriter) CopyBytesFromBuffer(length uint64, out []byte) ([]byte, error) {
if out == nil {
out = make([]byte, length)
}
bo.Position += length
numCopiedBytes := copy(out, bo.Buffer[bo.Position-length:bo.Position])
if numCopiedBytes != int(length) {
return nil, errors.New("could not copy data from buffer")
}
return out, nil
}
func (bo *ReadWriter) ReadBytesFromBuffer(length uint64) []byte {
subslice := bo.Buffer[bo.Position : bo.Position+length]
bo.Position += length
return subslice
}
func (bo *ReadWriter) ReadBytesFromBufferWithUint64LengthIndicator() []byte {
bo.Position += uint64Len
bufLen := binary.LittleEndian.Uint64(bo.Buffer[bo.Position-uint64Len : bo.Position])
bo.Position += bufLen
subslice := bo.Buffer[bo.Position-bufLen : bo.Position]
return subslice
}
func (bo *ReadWriter) DiscardBytesFromBufferWithUint64LengthIndicator() uint64 {
bo.Position += uint64Len
bufLen := binary.LittleEndian.Uint64(bo.Buffer[bo.Position-uint64Len : bo.Position])
bo.Position += bufLen
return bufLen
}
func (bo *ReadWriter) ReadBytesFromBufferWithUint32LengthIndicator() []byte {
bo.Position += uint32Len
bufLen := uint64(binary.LittleEndian.Uint32(bo.Buffer[bo.Position-uint32Len : bo.Position]))
if bufLen == 0 {
return nil
}
bo.Position += bufLen
subslice := bo.Buffer[bo.Position-bufLen : bo.Position]
return subslice
}
func (bo *ReadWriter) DiscardBytesFromBufferWithUint32LengthIndicator() uint32 {
bo.Position += uint32Len
bufLen := binary.LittleEndian.Uint32(bo.Buffer[bo.Position-uint32Len : bo.Position])
bo.Position += uint64(bufLen)
return bufLen
}
func (bo *ReadWriter) WriteUint64(value uint64) {
bo.Position += uint64Len
binary.LittleEndian.PutUint64(bo.Buffer[bo.Position-uint64Len:bo.Position], value)
}
func (bo *ReadWriter) WriteUint32(value uint32) {
bo.Position += uint32Len
binary.LittleEndian.PutUint32(bo.Buffer[bo.Position-uint32Len:bo.Position], value)
}
func (bo *ReadWriter) WriteUint16(value uint16) {
bo.Position += uint16Len
binary.LittleEndian.PutUint16(bo.Buffer[bo.Position-uint16Len:bo.Position], value)
}
func (bo *ReadWriter) CopyBytesToBuffer(copyBytes []byte) error {
lenCopyBytes := uint64(len(copyBytes))
bo.Position += lenCopyBytes
numCopiedBytes := copy(bo.Buffer[bo.Position-lenCopyBytes:bo.Position], copyBytes)
if numCopiedBytes != int(lenCopyBytes) {
return errors.New("could not copy data into buffer")
}
return nil
}
// Writes a uint64 length indicator about the buffer that's about to follow,
// then writes the buffer itself
func (bo *ReadWriter) CopyBytesToBufferWithUint64LengthIndicator(copyBytes []byte) error {
lenCopyBytes := uint64(len(copyBytes))
bo.Position += uint64Len
binary.LittleEndian.PutUint64(bo.Buffer[bo.Position-uint64Len:bo.Position], lenCopyBytes)
bo.Position += lenCopyBytes
numCopiedBytes := copy(bo.Buffer[bo.Position-lenCopyBytes:bo.Position], copyBytes)
if numCopiedBytes != int(lenCopyBytes) {
return errors.New("could not copy data into buffer")
}
return nil
}
// Writes a uint32 length indicator about the buffer that's about to follow,
// then writes the buffer itself
func (bo *ReadWriter) CopyBytesToBufferWithUint32LengthIndicator(copyBytes []byte) error {
lenCopyBytes := uint32(len(copyBytes))
bo.Position += uint32Len
binary.LittleEndian.PutUint32(bo.Buffer[bo.Position-uint32Len:bo.Position], lenCopyBytes)
bo.Position += uint64(lenCopyBytes)
numCopiedBytes := copy(bo.Buffer[bo.Position-uint64(lenCopyBytes):bo.Position], copyBytes)
if numCopiedBytes != int(lenCopyBytes) {
return errors.New("could not copy data into buffer")
}
return nil
}
func (bo *ReadWriter) MoveBufferPositionForward(length uint64) {
bo.Position += length
}
func (bo *ReadWriter) MoveBufferToAbsolutePosition(pos uint64) {
bo.Position = pos
}
func (bo *ReadWriter) WriteByte(b byte) {
bo.Buffer[bo.Position] = b
bo.Position += 1
}
func Float32ToByteVector(vec []float32) []byte {
byteVec := make([]byte, len(vec)*uint32Len)
for i := 0; i < len(vec); i++ {
binary.LittleEndian.PutUint32(byteVec[i*uint32Len:i*uint32Len+uint32Len], math.Float32bits(vec[i]))
}
return byteVec
}
func Float64ToByteVector(vec []float64) []byte {
byteVec := make([]byte, len(vec)*uint64Len)
for i := 0; i < len(vec); i++ {
binary.LittleEndian.PutUint64(byteVec[i*uint64Len:i*uint64Len+uint64Len], math.Float64bits(vec[i]))
}
return byteVec
}
func Float32FromByteVector(vecByte []byte) []float32 {
vector := make([]float32, len(vecByte)/uint32Len)
for i := 0; i < len(vector); i++ {
asUint := binary.LittleEndian.Uint32(vecByte[i*uint32Len : i*uint32Len+uint32Len])
vector[i] = math.Float32frombits(asUint)
}
return vector
}
func Float64FromByteVector(vecByte []byte) []float64 {
vector := make([]float64, len(vecByte)/uint64Len)
for i := 0; i < len(vector); i++ {
asUint := binary.LittleEndian.Uint64(vecByte[i*uint64Len : i*uint64Len+uint64Len])
vector[i] = math.Float64frombits(asUint)
}
return vector
}
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