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swarm/multihash: remove unused package

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This commit is contained in:
Javier Peletier 2018-11-26 00:58:10 +01:00
parent ec60336eac
commit 3f1fb4948e
3 changed files with 0 additions and 146 deletions
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1
swarm/OWNERS
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@ -7,7 +7,6 @@ swarm
├── fuse ────────────────── @jmozah, @holisticode ├── fuse ────────────────── @jmozah, @holisticode
├── grafana_dashboards ──── @nonsense ├── grafana_dashboards ──── @nonsense
├── metrics ─────────────── @nonsense, @holisticode ├── metrics ─────────────── @nonsense, @holisticode
├── multihash ───────────── @nolash
├── network ─────────────── ethersphere ├── network ─────────────── ethersphere
│ ├── bitvector ───────── @zelig, @janos, @gbalint │ ├── bitvector ───────── @zelig, @janos, @gbalint
│ ├── priorityqueue ───── @zelig, @janos, @gbalint │ ├── priorityqueue ───── @zelig, @janos, @gbalint

92
swarm/multihash/multihash.go
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@ -1,92 +0,0 @@
// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package multihash
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
)
const (
defaultMultihashLength = 32
defaultMultihashTypeCode = 0x1b
)
var (
multihashTypeCode uint8
MultihashLength = defaultMultihashLength
)
func init() {
multihashTypeCode = defaultMultihashTypeCode
MultihashLength = defaultMultihashLength
}
// check if valid swarm multihash
func isSwarmMultihashType(code uint8) bool {
return code == multihashTypeCode
}
// GetMultihashLength returns the digest length of the provided multihash
// It will fail if the multihash is not a valid swarm mulithash
func GetMultihashLength(data []byte) (int, int, error) {
cursor := 0
typ, c := binary.Uvarint(data)
if c <= 0 {
return 0, 0, errors.New("unreadable hashtype field")
}
if !isSwarmMultihashType(uint8(typ)) {
return 0, 0, fmt.Errorf("hash code %x is not a swarm hashtype", typ)
}
cursor += c
hashlength, c := binary.Uvarint(data[cursor:])
if c <= 0 {
return 0, 0, errors.New("unreadable length field")
}
cursor += c
// we cheekily assume hashlength < maxint
inthashlength := int(hashlength)
if len(data[c:]) < inthashlength {
return 0, 0, errors.New("length mismatch")
}
return inthashlength, cursor, nil
}
// FromMulithash returns the digest portion of the multihash
// It will fail if the multihash is not a valid swarm multihash
func FromMultihash(data []byte) ([]byte, error) {
hashLength, _, err := GetMultihashLength(data)
if err != nil {
return nil, err
}
return data[len(data)-hashLength:], nil
}
// ToMulithash wraps the provided digest data with a swarm mulithash header
func ToMultihash(hashData []byte) []byte {
buf := bytes.NewBuffer(nil)
b := make([]byte, 8)
c := binary.PutUvarint(b, uint64(multihashTypeCode))
buf.Write(b[:c])
c = binary.PutUvarint(b, uint64(len(hashData)))
buf.Write(b[:c])
buf.Write(hashData)
return buf.Bytes()
}

53
swarm/multihash/multihash_test.go
View file

@ -1,53 +0,0 @@
// Copyright 2018 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package multihash
import (
"bytes"
"math/rand"
"testing"
)
// parse multihash, and check that invalid multihashes fail
func TestCheckMultihash(t *testing.T) {
hashbytes := make([]byte, 32)
c, err := rand.Read(hashbytes)
if err != nil {
t.Fatal(err)
} else if c < 32 {
t.Fatal("short read")
}
expected := ToMultihash(hashbytes)
l, hl, _ := GetMultihashLength(expected)
if l != 32 {
t.Fatalf("expected length %d, got %d", 32, l)
} else if hl != 2 {
t.Fatalf("expected header length %d, got %d", 2, hl)
}
if _, _, err := GetMultihashLength(expected[1:]); err == nil {
t.Fatal("expected failure on corrupt header")
}
if _, _, err := GetMultihashLength(expected[:len(expected)-2]); err == nil {
t.Fatal("expected failure on short content")
}
dh, _ := FromMultihash(expected)
if !bytes.Equal(dh, hashbytes) {
t.Fatalf("expected content hash %x, got %x", hashbytes, dh)
}
}