77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
package main
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import (
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"bytes"
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"crypto/sha1"
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"flag"
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"fmt"
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"io"
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"log"
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"os"
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"path/filepath"
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"github.com/bradfitz/iter"
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"github.com/edsrzf/mmap-go"
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"github.com/anacrolix/torrent/metainfo"
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"github.com/anacrolix/torrent/mmap_span"
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)
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var (
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torrentPath = flag.String("torrent", "/path/to/the.torrent", "path of the torrent file")
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dataPath = flag.String("path", "/torrent/data", "path of the torrent data")
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)
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func fileToMmap(filename string, length int64) mmap.MMap {
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osFile, err := os.Open(filename)
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if os.IsNotExist(err) {
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return nil
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}
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if err != nil {
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log.Fatal(err)
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}
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goMMap, err := mmap.MapRegion(osFile, int(length), mmap.RDONLY, mmap.COPY, 0)
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if err != nil {
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log.Fatal(err)
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}
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if int64(len(goMMap)) != length {
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log.Printf("file mmap has wrong size: %#v", filename)
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}
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osFile.Close()
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return goMMap
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}
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func main() {
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log.SetFlags(log.Flags() | log.Lshortfile)
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flag.Parse()
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metaInfo, err := metainfo.LoadFromFile(*torrentPath)
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if err != nil {
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log.Fatal(err)
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}
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info := metaInfo.UnmarshalInfo()
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mMapSpan := &mmap_span.MMapSpan{}
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if len(info.Files) > 0 {
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for _, file := range info.Files {
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filename := filepath.Join(append([]string{*dataPath, info.Name}, file.Path...)...)
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goMMap := fileToMmap(filename, file.Length)
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mMapSpan.Append(goMMap)
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}
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log.Println(len(info.Files))
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} else {
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goMMap := fileToMmap(*dataPath, info.Length)
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mMapSpan.Append(goMMap)
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}
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log.Println(mMapSpan.Size())
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log.Println(len(info.Pieces))
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for i := range iter.N(info.NumPieces()) {
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p := info.Piece(i)
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hash := sha1.New()
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_, err := io.Copy(hash, io.NewSectionReader(mMapSpan, p.Offset(), p.Length()))
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if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("%d: %x: %v\n", i, p.Hash(), bytes.Equal(hash.Sum(nil), p.Hash().Bytes()))
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}
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}
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