mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-01-19 02:48:24 +00:00
53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
|
package storage
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"io"
|
||
|
|
"os"
|
||
|
|
"pkg/util"
|
||
|
|
)
|
||
|
|
|
||
|
|
func (n *Needle) Append(w io.Writer) uint32 {
|
||
|
|
header := make([]byte, 16)
|
||
|
|
util.Uint32toBytes(header[0:4], n.Cookie)
|
||
|
|
util.Uint64toBytes(header[4:12], n.Id)
|
||
|
|
n.Size = uint32(len(n.Data))
|
||
|
|
util.Uint32toBytes(header[12:16], n.Size)
|
||
|
|
w.Write(header)
|
||
|
|
w.Write(n.Data)
|
||
|
|
rest := 8 - ((n.Size + 16 + 4) % 8)
|
||
|
|
util.Uint32toBytes(header[0:4], n.Checksum.Value())
|
||
|
|
w.Write(header[0 : rest+4])
|
||
|
|
return n.Size
|
||
|
|
}
|
||
|
|
func (n *Needle) Read(r io.Reader, size uint32, version Version) (int, error) {
|
||
|
|
if version == Version1 {
|
||
|
|
bytes := make([]byte, size+16+4)
|
||
|
|
ret, e := r.Read(bytes)
|
||
|
|
n.Cookie = util.BytesToUint32(bytes[0:4])
|
||
|
|
n.Id = util.BytesToUint64(bytes[4:12])
|
||
|
|
n.Size = util.BytesToUint32(bytes[12:16])
|
||
|
|
n.Data = bytes[16 : 16+size]
|
||
|
|
checksum := util.BytesToUint32(bytes[16+size : 16+size+4])
|
||
|
|
if checksum != NewCRC(n.Data).Value() {
|
||
|
|
return 0, errors.New("CRC error! Data On Disk Corrupted!")
|
||
|
|
}
|
||
|
|
return ret, e
|
||
|
|
}else if version == Version2 {
|
||
|
|
}
|
||
|
|
return 0, errors.New("Unsupported Version!")
|
||
|
|
}
|
||
|
|
func ReadNeedle(r *os.File) (*Needle, uint32) {
|
||
|
|
n := new(Needle)
|
||
|
|
bytes := make([]byte, 16)
|
||
|
|
count, e := r.Read(bytes)
|
||
|
|
if count <= 0 || e != nil {
|
||
|
|
return nil, 0
|
||
|
|
}
|
||
|
|
n.Cookie = util.BytesToUint32(bytes[0:4])
|
||
|
|
n.Id = util.BytesToUint64(bytes[4:12])
|
||
|
|
n.Size = util.BytesToUint32(bytes[12:16])
|
||
|
|
rest := 8 - ((n.Size + 16 + 4) % 8)
|
||
|
|
return n, n.Size + 4 + rest
|
||
|
|
}
|