Golang Needle.Buffer Examples

Example #1

File: supper_block.go Project: Terry-Mao/bfs

// WriteAt write a needle by specified offset;
func (b *SuperBlock) WriteAt(offset uint32, n *needle.Needle) (err error) {
	if b.LastErr != nil {
		return b.LastErr
	}
	if _, err = b.w.WriteAt(n.Buffer(), needle.BlockOffset(offset)); err != nil {
		b.LastErr = err
	}
	return
}

Example #2

File: supper_block.go Project: Terry-Mao/bfs

// ReadAt read a needle by specified offset, before call it, must set needle
// TotalSize.
func (b *SuperBlock) ReadAt(n *needle.Needle) (err error) {
	if b.LastErr != nil {
		return b.LastErr
	}
	if _, err = b.r.ReadAt(n.Buffer(), needle.BlockOffset(n.Offset)); err == nil {
		err = n.Parse()
	} else {
		b.LastErr = err
	}
	return
}

Example #3

File: supper_block.go Project: Terry-Mao/bfs

// Write write needle to the block.
func (b *SuperBlock) Write(n *needle.Needle) (err error) {
	if b.LastErr != nil {
		return b.LastErr
	}
	if _maxOffset-n.IncrOffset < b.Offset {
		err = errors.ErrSuperBlockNoSpace
		return
	}
	if _, err = b.w.Write(n.Buffer()); err == nil {
		err = b.flush(false)
	} else {
		b.LastErr = err
		return
	}
	b.Offset += n.IncrOffset
	b.Size += int64(n.TotalSize)
	return
}