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package main
import (
"bytes"
"fmt"
"io"
)
type File 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 NewFile() *File {
return &File{}
}
func (f *File) ReadFrom(r io.ReadCloser) error {
buf := new(bytes.Buffer)
_, err := buf.ReadFrom(r)
if err != nil {
return err
}
defer func(r io.ReadCloser) {
err := r.Close()
if err != nil {
fmt.Printf("failed to close: %v+\n", err)
}
}(r)
if err != nil {
return err
}
decoded, err := NewDecoder(buf.String()).Decode()
if err != nil {
return err
}
content, ok := decoded.(map[string]any)
if !ok {
return fmt.Errorf("invalid contents")
}
f.Announce, ok = content["announce"].(string)
if !ok {
return fmt.Errorf("invalid announce field")
}
info, ok := content["info"].(map[string]any)
if !ok {
return fmt.Errorf("invalid info field")
}
f.Info.Length, ok = info["length"].(int)
if !ok {
return fmt.Errorf("invalid info.length field")
}
f.Info.Name, ok = info["name"].(string)
if !ok {
return fmt.Errorf("invalid info.name field")
}
f.Info.PieceLength, ok = info["piece length"].(int)
if !ok {
return fmt.Errorf("invalid info.piece length field")
}
f.Info.Pieces, ok = info["pieces"].(string)
if !ok {
return fmt.Errorf("invalid info.pieces field")
}
return nil
}
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