forked from Shiloh/githaven
119 lines
2.6 KiB
Go
119 lines
2.6 KiB
Go
// +build !amd64,!386 appengine
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package roaring
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import (
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"encoding/binary"
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"io"
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)
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func (b *arrayContainer) writeTo(stream io.Writer) (int, error) {
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buf := make([]byte, 2*len(b.content))
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for i, v := range b.content {
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base := i * 2
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buf[base] = byte(v)
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buf[base+1] = byte(v >> 8)
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}
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return stream.Write(buf)
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}
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func (b *arrayContainer) readFrom(stream io.Reader) (int, error) {
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err := binary.Read(stream, binary.LittleEndian, b.content)
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if err != nil {
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return 0, err
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}
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return 2 * len(b.content), nil
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}
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func (b *bitmapContainer) writeTo(stream io.Writer) (int, error) {
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// Write set
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buf := make([]byte, 8*len(b.bitmap))
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for i, v := range b.bitmap {
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base := i * 8
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buf[base] = byte(v)
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buf[base+1] = byte(v >> 8)
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buf[base+2] = byte(v >> 16)
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buf[base+3] = byte(v >> 24)
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buf[base+4] = byte(v >> 32)
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buf[base+5] = byte(v >> 40)
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buf[base+6] = byte(v >> 48)
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buf[base+7] = byte(v >> 56)
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}
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return stream.Write(buf)
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}
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func (b *bitmapContainer) readFrom(stream io.Reader) (int, error) {
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err := binary.Read(stream, binary.LittleEndian, b.bitmap)
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if err != nil {
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return 0, err
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}
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b.computeCardinality()
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return 8 * len(b.bitmap), nil
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}
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func (bc *bitmapContainer) asLittleEndianByteSlice() []byte {
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by := make([]byte, len(bc.bitmap)*8)
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for i := range bc.bitmap {
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binary.LittleEndian.PutUint64(by[i*8:], bc.bitmap[i])
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}
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return by
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}
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func uint64SliceAsByteSlice(slice []uint64) []byte {
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by := make([]byte, len(slice)*8)
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for i, v := range slice {
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binary.LittleEndian.PutUint64(by[i*8:], v)
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}
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return by
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}
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func byteSliceAsUint16Slice(slice []byte) []uint16 {
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if len(slice)%2 != 0 {
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panic("Slice size should be divisible by 2")
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}
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b := make([]uint16, len(slice)/2)
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for i := range b {
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b[i] = binary.LittleEndian.Uint16(slice[2*i:])
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}
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return b
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}
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func byteSliceAsUint64Slice(slice []byte) []uint64 {
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if len(slice)%8 != 0 {
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panic("Slice size should be divisible by 8")
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}
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b := make([]uint64, len(slice)/8)
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for i := range b {
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b[i] = binary.LittleEndian.Uint64(slice[8*i:])
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}
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return b
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}
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// Converts a byte slice to a interval16 slice.
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// The function assumes that the slice byte buffer is run container data
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// encoded according to Roaring Format Spec
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func byteSliceAsInterval16Slice(byteSlice []byte) []interval16 {
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if len(byteSlice)%4 != 0 {
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panic("Slice size should be divisible by 4")
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}
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intervalSlice := make([]interval16, len(byteSlice)/4)
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for i := range intervalSlice {
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intervalSlice[i] = interval16{
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start: binary.LittleEndian.Uint16(byteSlice[i*4:]),
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length: binary.LittleEndian.Uint16(byteSlice[i*4+2:]),
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}
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}
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return intervalSlice
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}
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