84 lines
1.5 KiB
Go
84 lines
1.5 KiB
Go
package storage
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
"os"
|
|
|
|
"github.com/anacrolix/missinggo"
|
|
|
|
"github.com/anacrolix/torrent/metainfo"
|
|
)
|
|
|
|
type Client struct {
|
|
ci ClientImpl
|
|
}
|
|
|
|
func NewClient(cl ClientImpl) *Client {
|
|
return &Client{cl}
|
|
}
|
|
|
|
func (cl Client) OpenTorrent(info *metainfo.Info, infoHash metainfo.Hash) (*Torrent, error) {
|
|
t, err := cl.ci.OpenTorrent(info, infoHash)
|
|
return &Torrent{t}, err
|
|
}
|
|
|
|
type Torrent struct {
|
|
TorrentImpl
|
|
}
|
|
|
|
func (t Torrent) Piece(p metainfo.Piece) Piece {
|
|
return Piece{t.TorrentImpl.Piece(p), p}
|
|
}
|
|
|
|
type Piece struct {
|
|
PieceImpl
|
|
mip metainfo.Piece
|
|
}
|
|
|
|
func (p Piece) WriteAt(b []byte, off int64) (n int, err error) {
|
|
c := p.Completion()
|
|
if c.Ok && c.Complete {
|
|
err = errors.New("piece already completed")
|
|
return
|
|
}
|
|
if off+int64(len(b)) > p.mip.Length() {
|
|
panic("write overflows piece")
|
|
}
|
|
b = missinggo.LimitLen(b, p.mip.Length()-off)
|
|
return p.PieceImpl.WriteAt(b, off)
|
|
}
|
|
|
|
func (p Piece) ReadAt(b []byte, off int64) (n int, err error) {
|
|
if off < 0 {
|
|
err = os.ErrInvalid
|
|
return
|
|
}
|
|
if off >= p.mip.Length() {
|
|
err = io.EOF
|
|
return
|
|
}
|
|
b = missinggo.LimitLen(b, p.mip.Length()-off)
|
|
if len(b) == 0 {
|
|
return
|
|
}
|
|
n, err = p.PieceImpl.ReadAt(b, off)
|
|
if n > len(b) {
|
|
panic(n)
|
|
}
|
|
off += int64(n)
|
|
if err == io.EOF && off < p.mip.Length() {
|
|
err = io.ErrUnexpectedEOF
|
|
}
|
|
if err == nil && off >= p.mip.Length() {
|
|
err = io.EOF
|
|
}
|
|
if n == 0 && err == nil {
|
|
err = io.ErrUnexpectedEOF
|
|
}
|
|
if off < p.mip.Length() && err != nil {
|
|
p.MarkNotComplete()
|
|
}
|
|
return
|
|
}
|