| 26 | } |
| 27 | |
| 28 | func (this *LazyFileHeader) FileHeaderUnsafe() (*FileHeader, error) { |
| 29 | if this.fileHeader != nil { |
| 30 | return this.fileHeader, nil |
| 31 | } |
| 32 | |
| 33 | var jsonPrefix = []byte("json:") |
| 34 | |
| 35 | var header = &FileHeader{} |
| 36 | |
| 37 | // json |
| 38 | if bytes.HasPrefix(this.rawData, jsonPrefix) { |
| 39 | err := json.Unmarshal(this.rawData[len(jsonPrefix):], header) |
| 40 | if err != nil { |
| 41 | return nil, err |
| 42 | } |
| 43 | return header, nil |
| 44 | } |
| 45 | |
| 46 | decompressor, err := SharedDecompressPool.Get(bytes.NewBuffer(this.rawData)) |
| 47 | if err != nil { |
| 48 | return nil, err |
| 49 | } |
| 50 | |
| 51 | defer func() { |
| 52 | _ = decompressor.Close() |
| 53 | SharedDecompressPool.Put(decompressor) |
| 54 | }() |
| 55 | |
| 56 | err = json.NewDecoder(decompressor).Decode(header) |
| 57 | if err != nil { |
| 58 | return nil, err |
| 59 | } |
| 60 | |
| 61 | header.IsWriting = false |
| 62 | |
| 63 | this.fileHeader = header |
| 64 | this.rawData = nil |
| 65 | |
| 66 | return header, nil |
| 67 | } |