87 lines
1.6 KiB
Go
87 lines
1.6 KiB
Go
package storage
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import (
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"io"
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"os"
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"github.com/anacrolix/missinggo"
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"github.com/anacrolix/torrent/metainfo"
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)
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type Client struct {
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ci ClientImpl
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}
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func NewClient(cl ClientImpl) *Client {
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return &Client{cl}
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}
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func (cl Client) OpenTorrent(info *metainfo.Info, infoHash metainfo.Hash) (*Torrent, error) {
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t, err := cl.ci.OpenTorrent(info, infoHash)
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return &Torrent{t}, err
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}
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type Torrent struct {
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TorrentImpl
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}
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func (t Torrent) Piece(p metainfo.Piece) Piece {
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return Piece{t.TorrentImpl.Piece(p), p}
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}
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type Piece struct {
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PieceImpl
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mip metainfo.Piece
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}
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func (p Piece) WriteAt(b []byte, off int64) (n int, err error) {
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// Callers should not be writing to completed pieces, but it's too
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// expensive to be checking this on every single write using uncached
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// completions.
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// c := p.Completion()
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// if c.Ok && c.Complete {
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// err = errors.New("piece already completed")
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// return
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// }
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if off+int64(len(b)) > p.mip.Length() {
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panic("write overflows piece")
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}
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b = missinggo.LimitLen(b, p.mip.Length()-off)
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return p.PieceImpl.WriteAt(b, off)
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}
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func (p Piece) ReadAt(b []byte, off int64) (n int, err error) {
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if off < 0 {
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err = os.ErrInvalid
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return
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}
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if off >= p.mip.Length() {
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err = io.EOF
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return
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}
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b = missinggo.LimitLen(b, p.mip.Length()-off)
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if len(b) == 0 {
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return
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}
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n, err = p.PieceImpl.ReadAt(b, off)
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if n > len(b) {
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panic(n)
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}
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off += int64(n)
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if err == io.EOF && off < p.mip.Length() {
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err = io.ErrUnexpectedEOF
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}
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if err == nil && off >= p.mip.Length() {
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err = io.EOF
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}
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if n == 0 && err == nil {
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err = io.ErrUnexpectedEOF
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}
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if off < p.mip.Length() && err != nil {
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p.MarkNotComplete()
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}
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return
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}
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