mirror of
https://github.com/vmware-tanzu/velero.git
synced 2026-07-24 17:12:43 +00:00
118 lines
2.4 KiB
Go
118 lines
2.4 KiB
Go
/*
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Copyright The Velero Contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cbt
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import (
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"math/bits"
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"github.com/RoaringBitmap/roaring"
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"github.com/vmware-tanzu/velero/pkg/uploader/cbt/types"
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)
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const (
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InvalidOffset64 = ^uint64(0)
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)
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type bitmapImpl struct {
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bitmap *roaring.Bitmap
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blockSize uint
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blockSizeLog int
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length uint64
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snapshot string
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changeID string
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volumeID string
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}
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type bitmapIterator struct {
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bitmapImpl
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iterator roaring.IntPeekable
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}
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func NewBitmap(blockSize uint, length uint64, snapshot string, changeID string, volumeID string) types.Bitmap {
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return &bitmapImpl{
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bitmap: roaring.New(),
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blockSize: blockSize,
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blockSizeLog: bits.Len(blockSize) - 1,
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length: length,
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snapshot: snapshot,
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changeID: changeID,
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volumeID: volumeID,
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}
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}
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func (c *bitmapImpl) Set(offset, length uint64) {
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if offset >= c.length {
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return
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}
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if offset+length > c.length {
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length = c.length - offset
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}
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start := offset >> c.blockSizeLog
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end := (offset + length + uint64(c.blockSize) - 1) >> c.blockSizeLog
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c.bitmap.AddRange(start, end)
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}
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func (c *bitmapImpl) SetFull() {
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start := uint64(0)
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end := (c.length + uint64(c.blockSize) - 1) >> c.blockSizeLog
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c.bitmap.AddRange(start, end)
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}
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func (c *bitmapImpl) Snapshot() string {
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return c.snapshot
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}
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func (c *bitmapImpl) ChangeID() string {
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return c.changeID
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}
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func (c *bitmapImpl) VolumeID() string {
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return c.volumeID
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}
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func (c *bitmapImpl) Iterator() types.Iterator {
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if c.bitmap == nil {
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return nil
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}
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return &bitmapIterator{
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bitmapImpl: *c,
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iterator: c.bitmap.Iterator(),
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}
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}
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func (c *bitmapIterator) Next() (uint64, bool) {
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if !c.iterator.HasNext() {
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return InvalidOffset64, false
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}
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return uint64(c.iterator.Next()) << c.blockSizeLog, true
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}
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func (c *bitmapIterator) Count() uint64 {
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return c.bitmap.GetCardinality()
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}
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func (c *bitmapIterator) BlockSize() uint {
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return c.blockSize
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}
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