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package main
import (
"crypto/sha1"
bencode "github.com/jackpal/bencode-go"
)
type Meta struct {
Announce string `bencode:"announce"`
Info FileInfo `bencode:"info"`
}
type FileInfo struct {
Length int `bencode:"length"`
Name string `bencode:"name"`
PieceLength int `bencode:"piece length"`
Pieces string `bencode:"pieces"`
}
func (m Meta) InfoHash() ([]byte, error) {
sha := sha1.New()
if err := bencode.Marshal(sha, m.Info); err != nil {
return nil, err
}
return sha.Sum(nil), nil
}
func (m Meta) PieceHashes() []string {
hashes := make([]string, 0, len(m.Info.Pieces)/20)
for i := 0; i < len(m.Info.Pieces); i += 20 {
hashes = append(hashes, m.Info.Pieces[i:i+20])
}
return hashes
}
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