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287 lines
8.2 KiB
287 lines
8.2 KiB
package storage
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import (
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"errors"
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"fmt"
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"io"
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"os"
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"github.com/chrislusf/weed-fs/go/glog"
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"github.com/chrislusf/weed-fs/go/util"
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)
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const (
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FlagGzip = 0x01
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FlagHasName = 0x02
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FlagHasMime = 0x04
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FlagHasLastModifiedDate = 0x08
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FlagHasTtl = 0x10
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LastModifiedBytesLength = 5
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TtlBytesLength = 2
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)
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func (n *Needle) DiskSize() int64 {
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padding := NeedlePaddingSize - ((NeedleHeaderSize + int64(n.Size) + NeedleChecksumSize) % NeedlePaddingSize)
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return NeedleHeaderSize + int64(n.Size) + padding + NeedleChecksumSize
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}
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func (n *Needle) Append(w io.Writer, version Version) (size uint32, err error) {
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if s, ok := w.(io.Seeker); ok {
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if end, e := s.Seek(0, 1); e == nil {
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defer func(s io.Seeker, off int64) {
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if err != nil {
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if _, e = s.Seek(off, 0); e != nil {
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glog.V(0).Infof("Failed to seek %s back to %d with error: %s", w, off, e.Error())
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}
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}
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}(s, end)
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} else {
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err = fmt.Errorf("Cnnot Read Current Volume Position: %s", e.Error())
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return
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}
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}
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switch version {
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case Version1:
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header := make([]byte, NeedleHeaderSize)
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util.Uint32toBytes(header[0:4], n.Cookie)
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util.Uint64toBytes(header[4:12], n.Id)
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n.Size = uint32(len(n.Data))
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size = n.Size
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util.Uint32toBytes(header[12:16], n.Size)
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if _, err = w.Write(header); err != nil {
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return
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}
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if _, err = w.Write(n.Data); err != nil {
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return
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}
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padding := NeedlePaddingSize - ((NeedleHeaderSize + n.Size + NeedleChecksumSize) % NeedlePaddingSize)
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util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value())
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_, err = w.Write(header[0 : NeedleChecksumSize+padding])
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return
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case Version2:
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header := make([]byte, NeedleHeaderSize)
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util.Uint32toBytes(header[0:4], n.Cookie)
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util.Uint64toBytes(header[4:12], n.Id)
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n.DataSize, n.NameSize, n.MimeSize = uint32(len(n.Data)), uint8(len(n.Name)), uint8(len(n.Mime))
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if n.DataSize > 0 {
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n.Size = 4 + n.DataSize + 1
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if n.HasName() {
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n.Size = n.Size + 1 + uint32(n.NameSize)
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}
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if n.HasMime() {
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n.Size = n.Size + 1 + uint32(n.MimeSize)
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}
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if n.HasLastModifiedDate() {
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n.Size = n.Size + LastModifiedBytesLength
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}
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if n.HasTtl() {
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n.Size = n.Size + TtlBytesLength
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}
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}
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size = n.DataSize
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util.Uint32toBytes(header[12:16], n.Size)
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if _, err = w.Write(header); err != nil {
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return
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}
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if n.DataSize > 0 {
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util.Uint32toBytes(header[0:4], n.DataSize)
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if _, err = w.Write(header[0:4]); err != nil {
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return
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}
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if _, err = w.Write(n.Data); err != nil {
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return
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}
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util.Uint8toBytes(header[0:1], n.Flags)
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if _, err = w.Write(header[0:1]); err != nil {
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return
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}
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if n.HasName() {
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util.Uint8toBytes(header[0:1], n.NameSize)
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if _, err = w.Write(header[0:1]); err != nil {
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return
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}
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if _, err = w.Write(n.Name); err != nil {
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return
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}
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}
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if n.HasMime() {
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util.Uint8toBytes(header[0:1], n.MimeSize)
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if _, err = w.Write(header[0:1]); err != nil {
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return
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}
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if _, err = w.Write(n.Mime); err != nil {
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return
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}
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}
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if n.HasLastModifiedDate() {
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util.Uint64toBytes(header[0:8], n.LastModified)
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if _, err = w.Write(header[8-LastModifiedBytesLength : 8]); err != nil {
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return
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}
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}
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if n.HasTtl() {
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n.Ttl.ToBytes(header[0:TtlBytesLength])
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if _, err = w.Write(header[0:TtlBytesLength]); err != nil {
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return
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}
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}
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}
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padding := NeedlePaddingSize - ((NeedleHeaderSize + n.Size + NeedleChecksumSize) % NeedlePaddingSize)
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util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value())
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_, err = w.Write(header[0 : NeedleChecksumSize+padding])
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return n.DataSize, err
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}
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return 0, fmt.Errorf("Unsupported Version! (%d)", version)
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}
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func (n *Needle) Read(r *os.File, offset int64, size uint32, version Version) (ret int, err error) {
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switch version {
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case Version1:
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bytes := make([]byte, NeedleHeaderSize+size+NeedleChecksumSize)
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if ret, err = r.ReadAt(bytes, offset); err != nil {
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return
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}
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n.readNeedleHeader(bytes)
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n.Data = bytes[NeedleHeaderSize : NeedleHeaderSize+size]
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checksum := util.BytesToUint32(bytes[NeedleHeaderSize+size : NeedleHeaderSize+size+NeedleChecksumSize])
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newChecksum := NewCRC(n.Data)
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if checksum != newChecksum.Value() {
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return 0, errors.New("CRC error! Data On Disk Corrupted!")
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}
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n.Checksum = newChecksum
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return
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case Version2:
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if size == 0 {
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return 0, nil
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}
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bytes := make([]byte, NeedleHeaderSize+size+NeedleChecksumSize)
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if ret, err = r.ReadAt(bytes, offset); err != nil {
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return
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}
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if ret != int(NeedleHeaderSize+size+NeedleChecksumSize) {
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return 0, errors.New("File Entry Not Found!")
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}
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n.readNeedleHeader(bytes)
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if n.Size != size {
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return 0, fmt.Errorf("File Entry Not Found! Needle %d Memory %d", n.Size, size)
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}
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n.readNeedleDataVersion2(bytes[NeedleHeaderSize : NeedleHeaderSize+int(n.Size)])
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checksum := util.BytesToUint32(bytes[NeedleHeaderSize+n.Size : NeedleHeaderSize+n.Size+NeedleChecksumSize])
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newChecksum := NewCRC(n.Data)
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if checksum != newChecksum.Value() {
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return 0, errors.New("CRC error! Data On Disk Corrupted!")
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}
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n.Checksum = newChecksum
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return
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}
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return 0, fmt.Errorf("Unsupported Version! (%d)", version)
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}
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func (n *Needle) readNeedleHeader(bytes []byte) {
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n.Cookie = util.BytesToUint32(bytes[0:4])
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n.Id = util.BytesToUint64(bytes[4:12])
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n.Size = util.BytesToUint32(bytes[12:NeedleHeaderSize])
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}
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func (n *Needle) readNeedleDataVersion2(bytes []byte) {
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index, lenBytes := 0, len(bytes)
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if index < lenBytes {
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n.DataSize = util.BytesToUint32(bytes[index : index+4])
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index = index + 4
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n.Data = bytes[index : index+int(n.DataSize)]
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index = index + int(n.DataSize)
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n.Flags = bytes[index]
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index = index + 1
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}
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if index < lenBytes && n.HasName() {
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n.NameSize = uint8(bytes[index])
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index = index + 1
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n.Name = bytes[index : index+int(n.NameSize)]
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index = index + int(n.NameSize)
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}
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if index < lenBytes && n.HasMime() {
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n.MimeSize = uint8(bytes[index])
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index = index + 1
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n.Mime = bytes[index : index+int(n.MimeSize)]
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index = index + int(n.MimeSize)
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}
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if index < lenBytes && n.HasLastModifiedDate() {
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n.LastModified = util.BytesToUint64(bytes[index : index+LastModifiedBytesLength])
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index = index + LastModifiedBytesLength
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}
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if index < lenBytes && n.HasTtl() {
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n.Ttl = LoadTTLFromBytes(bytes[index : index+TtlBytesLength])
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index = index + TtlBytesLength
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}
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}
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func ReadNeedleHeader(r *os.File, version Version, offset int64) (n *Needle, bodyLength uint32, err error) {
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n = new(Needle)
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if version == Version1 || version == Version2 {
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bytes := make([]byte, NeedleHeaderSize)
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var count int
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count, err = r.ReadAt(bytes, offset)
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if count <= 0 || err != nil {
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return nil, 0, err
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}
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n.readNeedleHeader(bytes)
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padding := NeedlePaddingSize - ((n.Size + NeedleHeaderSize + NeedleChecksumSize) % NeedlePaddingSize)
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bodyLength = n.Size + NeedleChecksumSize + padding
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}
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return
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}
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//n should be a needle already read the header
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//the input stream will read until next file entry
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func (n *Needle) ReadNeedleBody(r *os.File, version Version, offset int64, bodyLength uint32) (err error) {
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if bodyLength <= 0 {
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return nil
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}
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switch version {
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case Version1:
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bytes := make([]byte, bodyLength)
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if _, err = r.ReadAt(bytes, offset); err != nil {
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return
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}
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n.Data = bytes[:n.Size]
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n.Checksum = NewCRC(n.Data)
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case Version2:
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bytes := make([]byte, bodyLength)
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if _, err = r.ReadAt(bytes, offset); err != nil {
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return
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}
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n.readNeedleDataVersion2(bytes[0:n.Size])
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n.Checksum = NewCRC(n.Data)
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default:
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err = fmt.Errorf("Unsupported Version! (%d)", version)
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}
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return
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}
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func (n *Needle) IsGzipped() bool {
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return n.Flags&FlagGzip > 0
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}
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func (n *Needle) SetGzipped() {
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n.Flags = n.Flags | FlagGzip
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}
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func (n *Needle) HasName() bool {
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return n.Flags&FlagHasName > 0
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}
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func (n *Needle) SetHasName() {
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n.Flags = n.Flags | FlagHasName
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}
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func (n *Needle) HasMime() bool {
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return n.Flags&FlagHasMime > 0
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}
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func (n *Needle) SetHasMime() {
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n.Flags = n.Flags | FlagHasMime
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}
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func (n *Needle) HasLastModifiedDate() bool {
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return n.Flags&FlagHasLastModifiedDate > 0
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}
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func (n *Needle) SetHasLastModifiedDate() {
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n.Flags = n.Flags | FlagHasLastModifiedDate
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}
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func (n *Needle) HasTtl() bool {
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return n.Flags&FlagHasTtl > 0
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}
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func (n *Needle) SetHasTtl() {
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n.Flags = n.Flags | FlagHasTtl
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}
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