go-bencode

Installation

go get github.com/IncSW/go-bencode

import bencode "github.com/IncSW/go-bencode"

Quick Start

var dict interface{} = map[string]interface{}{
	"int":    123,
	"string": "Hello, World",
	"list":   []interface{}{"foo", "bar"},
}
data, err := bencode.Marshal(dict)
if err != nil {
	panic(err)
}
fmt.Println(string(data))

// Output:
// d3:inti123e4:listl3:foo3:bare6:string12:Hello, Worlde

data, err := bencode.Unmarshal(value)

Performance benchmarks

Go 1.16, Debian 9.1, i7-7700

Marshal

Library	Time	Bytes Allocated	Objects Allocated	Notes
IncSW/go-bencode	598.5 ns/op	512 B/op	1 allocs/op
cristalhq/bencode	939.4 ns/op	928 B/op	4 allocs/op
marksamman/bencode	1002 ns/op	736 B/op	9 allocs/op	4
aleksatr/go-bencode	1060 ns/op	736 B/op	9 allocs/op
chihaya/chihaya	1722 ns/op	1009 B/op	53 allocs/op	1
lajide/bencode	1725 ns/op	1011 B/op	53 allocs/op	1
nabilanam/bencode	2865 ns/op	3192 B/op	54 allocs/op	5
anacrolix/torrent	3179 ns/op	1328 B/op	25 allocs/op
lwch/bencode	3340 ns/op	1792 B/op	75 allocs/op	1, 2
tumdum/bencoding	3419 ns/op	1752 B/op	60 allocs/op
stints/bencode	4018 ns/op	3120 B/op	100 allocs/op	1, 2
ehmry/go-bencode	4569 ns/op	1496 B/op	33 allocs/op
jackpal/bencode-go	4702 ns/op	2016 B/op	45 allocs/op
zeebo/bencode	5003 ns/op	1376 B/op	33 allocs/op
owenliang/dht	5180 ns/op	3279 B/op	80 allocs/op	5
cuberat/go-bencode	5589 ns/op	1929 B/op	71 allocs/op	2

MarshalTo

Library	Time	Bytes Allocated	Objects Allocated	Notes
IncSW/go-bencode	503.0 ns/op	0 B/op	0 allocs/op
cristalhq/bencode	668.4 ns/op	0 B/op	0 allocs/op
chihaya/chihaya	1432 ns/op	307 B/op	49 allocs/op	1
lajide/bencode	1462 ns/op	307 B/op	49 allocs/op	1
anacrolix/torrent	2954 ns/op	720 B/op	21 allocs/op
lwch/bencode	3093 ns/op	1089 B/op	71 allocs/op	1, 2
tumdum/bencoding	3474 ns/op	1752 B/op	60 allocs/op
jackpal/bencode-go	4479 ns/op	1408 B/op	41 allocs/op
ehmry/go-bencode	4650 ns/op	1528 B/op	33 allocs/op
cuberat/go-bencode	5360 ns/op	1321 B/op	67 allocs/op	2

Unmarshal

Library	Time	Bytes Allocated	Objects Allocated	Notes
IncSW/go-bencode	991.5 ns/op	960 B/op	18 allocs/op
cristalhq/bencode	1160 ns/op	960 B/op	18 allocs/op
nabilanam/bencode	1379 ns/op	1240 B/op	39 allocs/op
owenliang/dht	1702 ns/op	1352 B/op	46 allocs/op
aleksatr/go-bencode	2279 ns/op	1816 B/op	51 allocs/op
jackpal/bencode-go	2597 ns/op	1688 B/op	59 allocs/op
marksamman/bencode	2758 ns/op	5768 B/op	54 allocs/op
ehmry/go-bencode	2865 ns/op	2064 B/op	41 allocs/op
chihaya/chihaya	2961 ns/op	5880 B/op	61 allocs/op
lajide/bencode	2973 ns/op	5880 B/op	61 allocs/op
anacrolix/torrent	3723 ns/op	2456 B/op	62 allocs/op
cuberat/go-bencode	4687 ns/op	6544 B/op	119 allocs/op
zeebo/bencode	5954 ns/op	6376 B/op	91 allocs/op
tumdum/bencoding	7891 ns/op	6568 B/op	157 allocs/op
lwch/bencode	-	-	-	3
stints/bencode	-	-	-	6

RealWorld ubuntu-21.04-desktop-amd64.iso.torrent

Library	Time	Bytes Allocated	Objects Allocated
IncSW/go-bencode Unmarshal	1269 ns/op	1016 B/op	21 allocs/op
IncSW/go-bencode Marshal	27929 ns/op	262816 B/op	2 allocs/op
IncSW/go-bencode MarshalTo	7851 ns/op	0 B/op	0 allocs/op
cristalhq/bencode Unmarshal	1552 ns/op	1016 B/op	21 allocs/op
cristalhq/bencode Marshal	49125 ns/op	443168 B/op	5 allocs/op
cristalhq/bencode MarshalTo	8183 ns/op	0 B/op	0 allocs/op
aleksatr/go-bencode Unmarshal	21615 ns/op	223352 B/op	69 allocs/op
aleksatr/go-bencode Marshal	26401 ns/op	222689 B/op	13 allocs/op
jackpal/bencode-go Unmarshal	48384 ns/op	444484 B/op	81 allocs/op
jackpal/bencode-go Marshal	55097 ns/op	445694 B/op	60 allocs/op
jackpal/bencode-go MarshalTo	35800 ns/op	223128 B/op	54 allocs/op

Notes

1. BUG: Keys must be strings and appear in sorted order (sorted as raw strings, not alphanumerics). http://bittorrent.org/beps/bep_0003.html#bencoding
2. BUG: []byte encoding as a list
3. BUG: not supported list in list
4. WARN: ignoring unsupported types without errors
5. INFO: just 4 types supported
6. INFO: files only

License

MIT License.