mirror of
https://github.com/chrislusf/seaweedfs
synced 2024-06-03 01:00:04 +02:00
82 lines
1.7 KiB
Go
82 lines
1.7 KiB
Go
//go:build 5BytesOffset
|
|
// +build 5BytesOffset
|
|
|
|
package types
|
|
|
|
import (
|
|
"fmt"
|
|
)
|
|
|
|
type OffsetHigher struct {
|
|
b4 byte
|
|
}
|
|
|
|
const (
|
|
OffsetSize = 4 + 1
|
|
MaxPossibleVolumeSize uint64 = 4 * 1024 * 1024 * 1024 * 8 * 256 /* 256 is from the extra byte */ // 8TB
|
|
)
|
|
|
|
func OffsetToBytes(bytes []byte, offset Offset) {
|
|
bytes[4] = offset.b4
|
|
bytes[3] = offset.b0
|
|
bytes[2] = offset.b1
|
|
bytes[1] = offset.b2
|
|
bytes[0] = offset.b3
|
|
}
|
|
|
|
// only for testing, will be removed later.
|
|
func Uint32ToOffset(offset uint32) Offset {
|
|
return Offset{
|
|
OffsetHigher: OffsetHigher{
|
|
b4: byte(offset >> 32),
|
|
},
|
|
OffsetLower: OffsetLower{
|
|
b0: byte(offset),
|
|
b1: byte(offset >> 8),
|
|
b2: byte(offset >> 16),
|
|
b3: byte(offset >> 24),
|
|
},
|
|
}
|
|
}
|
|
|
|
func BytesToOffset(bytes []byte) Offset {
|
|
return Offset{
|
|
OffsetHigher: OffsetHigher{
|
|
b4: bytes[4],
|
|
},
|
|
OffsetLower: OffsetLower{
|
|
b0: bytes[3],
|
|
b1: bytes[2],
|
|
b2: bytes[1],
|
|
b3: bytes[0],
|
|
},
|
|
}
|
|
}
|
|
|
|
func (offset Offset) IsZero() bool {
|
|
return offset.b0 == 0 && offset.b1 == 0 && offset.b2 == 0 && offset.b3 == 0 && offset.b4 == 0
|
|
}
|
|
|
|
func ToOffset(offset int64) Offset {
|
|
smaller := offset / int64(NeedlePaddingSize)
|
|
return Offset{
|
|
OffsetHigher: OffsetHigher{
|
|
b4: byte(smaller >> 32),
|
|
},
|
|
OffsetLower: OffsetLower{
|
|
b0: byte(smaller),
|
|
b1: byte(smaller >> 8),
|
|
b2: byte(smaller >> 16),
|
|
b3: byte(smaller >> 24),
|
|
},
|
|
}
|
|
}
|
|
|
|
func (offset Offset) ToActualOffset() (actualOffset int64) {
|
|
return (int64(offset.b0) + int64(offset.b1)<<8 + int64(offset.b2)<<16 + int64(offset.b3)<<24 + int64(offset.b4)<<32) * int64(NeedlePaddingSize)
|
|
}
|
|
|
|
func (offset Offset) String() string {
|
|
return fmt.Sprintf("%d", int64(offset.b0)+int64(offset.b1)<<8+int64(offset.b2)<<16+int64(offset.b3)<<24+int64(offset.b4)<<32)
|
|
}
|