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84 lines
2.1 KiB
84 lines
2.1 KiB
package roaring
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import (
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"github.com/tinylib/msgp/msgp"
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)
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// writeTo for runContainer16 follows this
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// spec: https://github.com/RoaringBitmap/RoaringFormatSpec
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//
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func (b *runContainer16) writeTo(stream io.Writer) (int, error) {
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buf := make([]byte, 2+4*len(b.iv))
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binary.LittleEndian.PutUint16(buf[0:], uint16(len(b.iv)))
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for i, v := range b.iv {
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binary.LittleEndian.PutUint16(buf[2+i*4:], v.start)
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binary.LittleEndian.PutUint16(buf[2+2+i*4:], v.length)
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}
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return stream.Write(buf)
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}
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func (b *runContainer32) writeToMsgpack(stream io.Writer) (int, error) {
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bts, err := b.MarshalMsg(nil)
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if err != nil {
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return 0, err
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}
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return stream.Write(bts)
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}
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func (b *runContainer16) writeToMsgpack(stream io.Writer) (int, error) {
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bts, err := b.MarshalMsg(nil)
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if err != nil {
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return 0, err
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}
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return stream.Write(bts)
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}
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func (b *runContainer32) readFromMsgpack(stream io.Reader) (int, error) {
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err := msgp.Decode(stream, b)
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return 0, err
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}
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func (b *runContainer16) readFromMsgpack(stream io.Reader) (int, error) {
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err := msgp.Decode(stream, b)
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return 0, err
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}
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var errCorruptedStream = errors.New("insufficient/odd number of stored bytes, corrupted stream detected")
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func (b *runContainer16) readFrom(stream io.Reader) (int, error) {
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b.iv = b.iv[:0]
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b.card = 0
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var numRuns uint16
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err := binary.Read(stream, binary.LittleEndian, &numRuns)
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if err != nil {
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return 0, err
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}
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nr := int(numRuns)
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encRun := make([]uint16, 2*nr)
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by := make([]byte, 4*nr)
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err = binary.Read(stream, binary.LittleEndian, &by)
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if err != nil {
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return 0, err
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}
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for i := range encRun {
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if len(by) < 2 {
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return 0, errCorruptedStream
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}
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encRun[i] = binary.LittleEndian.Uint16(by)
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by = by[2:]
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}
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for i := 0; i < nr; i++ {
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if i > 0 && b.iv[i-1].last() >= encRun[i*2] {
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return 0, fmt.Errorf("error: stored runContainer had runs that were not in sorted order!! (b.iv[i-1=%v].last = %v >= encRun[i=%v] = %v)", i-1, b.iv[i-1].last(), i, encRun[i*2])
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}
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b.iv = append(b.iv, interval16{start: encRun[i*2], length: encRun[i*2+1]})
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b.card += int64(encRun[i*2+1]) + 1
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}
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return 0, err
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}
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