(offset int64, whence int)
| 66 | } |
| 67 | |
| 68 | func (r *DynamicReadAtSeeker) Seek(offset int64, whence int) (int64, error) { |
| 69 | switch whence { |
| 70 | case io.SeekStart: |
| 71 | case io.SeekCurrent: |
| 72 | if offset == 0 { |
| 73 | return r.offset, nil |
| 74 | } |
| 75 | offset = r.offset + offset |
| 76 | case io.SeekEnd: |
| 77 | offset = r.block.Size() + offset |
| 78 | default: |
| 79 | return 0, errors.New("Seek: invalid whence") |
| 80 | } |
| 81 | |
| 82 | if offset < 0 || offset > r.block.Size() { |
| 83 | return 0, errors.New("Seek: invalid offset") |
| 84 | } |
| 85 | r.offset = offset |
| 86 | return offset, nil |
| 87 | } |
| 88 | |
| 89 | func NewDynamicReadAtSeeker(block Block) *DynamicReadAtSeeker { |
| 90 | return &DynamicReadAtSeeker{ |
no test coverage detected