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Use metainfo.ChoosePieceLength from more locations

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This commit is contained in:
Matt Joiner 2022-06-27 19:25:38 +10:00
parent 12279621e4
commit ae2e4bf7e7
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GPG Key ID: 6B990B8185E7F782
4 changed files with 13 additions and 12 deletions
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2
cmd/torrent/serve.go
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@ -31,7 +31,7 @@ func serve(ctx args.SubCmdCtx) error {
if err != nil {
return fmt.Errorf("calculating total length of %q: %v", filePath, err)
}
pieceLength := choosePieceLength(totalLength)
pieceLength := metainfo.ChoosePieceLength(totalLength)
info := metainfo.Info{
PieceLength: pieceLength,
}

3
metainfo/info.go
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@ -74,6 +74,9 @@ func (info *Info) BuildFromFilePath(root string) (err error) {
slices.Sort(info.Files, func(l, r FileInfo) bool {
return strings.Join(l.Path, "/") < strings.Join(r.Path, "/")
})
if info.PieceLength == 0 {
info.PieceLength = ChoosePieceLength(info.TotalLength())
}
err = info.GeneratePieces(func(fi FileInfo) (io.ReadCloser, error) {
return os.Open(filepath.Join(root, strings.Join(fi.Path, string(filepath.Separator))))
})

2
metainfo/metainfo.go
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@ -62,10 +62,8 @@ func (mi MetaInfo) Write(w io.Writer) error {
// Set good default values in preparation for creating a new MetaInfo file.
func (mi *MetaInfo) SetDefaults() {
mi.Comment = ""
mi.CreatedBy = "github.com/anacrolix/torrent"
mi.CreationDate = time.Now().Unix()
// mi.Info.PieceLength = 256 * 1024
}
// Creates a Magnet from a MetaInfo. Optional infohash and parsed info can be provided.

18
cmd/torrent/piece-length.go → metainfo/piece-length.go
View File

@ -28,24 +28,24 @@
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package main
package metainfo
// For more context on why these numbers, see http://wiki.vuze.com/w/Torrent_Piece_Size
const MinimumPieceLength = 16 * 1024
const TargetPieceCountLog2 = 10
const TargetPieceCountMin = 1 << TargetPieceCountLog2
const minimumPieceLength = 16 * 1024
const targetPieceCountLog2 = 10
const targetPieceCountMin = 1 << targetPieceCountLog2
// Target piece count should be < TargetPieceCountMax
const TargetPieceCountMax = TargetPieceCountMin << 1
// Target piece count should be < targetPieceCountMax
const targetPieceCountMax = targetPieceCountMin << 1
// Choose a good piecelength.
func choosePieceLength(totalLength int64) (pieceLength int64) {
func ChoosePieceLength(totalLength int64) (pieceLength int64) {
// Must be a power of 2.
// Must be a multiple of 16KB
// Prefer to provide around 1024..2048 pieces.
pieceLength = MinimumPieceLength
pieceLength = minimumPieceLength
pieces := totalLength / pieceLength
for pieces >= TargetPieceCountMax {
for pieces >= targetPieceCountMax {
pieceLength <<= 1
pieces >>= 1
}