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swarm/storage: change Proximity function and add TestProximity test (e…
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// 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 storage | ||
|
||
import ( | ||
"strconv" | ||
"testing" | ||
) | ||
|
||
// TestProximity validates Proximity function with explicit | ||
// values in a table-driven test. It is highly dependant on | ||
// MaxPO constant and it validates cases up to MaxPO=32. | ||
func TestProximity(t *testing.T) { | ||
// integer from base2 encoded string | ||
bx := func(s string) uint8 { | ||
i, err := strconv.ParseUint(s, 2, 8) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
return uint8(i) | ||
} | ||
// adjust expected bins in respect to MaxPO | ||
limitPO := func(po uint8) uint8 { | ||
if po > MaxPO { | ||
return MaxPO | ||
} | ||
return po | ||
} | ||
base := []byte{bx("00000000"), bx("00000000"), bx("00000000"), bx("00000000")} | ||
for _, tc := range []struct { | ||
addr []byte | ||
po uint8 | ||
}{ | ||
{ | ||
addr: base, | ||
po: MaxPO, | ||
}, | ||
{ | ||
addr: []byte{bx("10000000"), bx("00000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(0), | ||
}, | ||
{ | ||
addr: []byte{bx("01000000"), bx("00000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(1), | ||
}, | ||
{ | ||
addr: []byte{bx("00100000"), bx("00000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(2), | ||
}, | ||
{ | ||
addr: []byte{bx("00010000"), bx("00000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(3), | ||
}, | ||
{ | ||
addr: []byte{bx("00001000"), bx("00000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(4), | ||
}, | ||
{ | ||
addr: []byte{bx("00000100"), bx("00000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(5), | ||
}, | ||
{ | ||
addr: []byte{bx("00000010"), bx("00000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(6), | ||
}, | ||
{ | ||
addr: []byte{bx("00000001"), bx("00000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(7), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("10000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(8), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("01000000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(9), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00100000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(10), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00010000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(11), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00001000"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(12), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000100"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(13), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000010"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(14), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000001"), bx("00000000"), bx("00000000")}, | ||
po: limitPO(15), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("10000000"), bx("00000000")}, | ||
po: limitPO(16), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("01000000"), bx("00000000")}, | ||
po: limitPO(17), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00100000"), bx("00000000")}, | ||
po: limitPO(18), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00010000"), bx("00000000")}, | ||
po: limitPO(19), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00001000"), bx("00000000")}, | ||
po: limitPO(20), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000100"), bx("00000000")}, | ||
po: limitPO(21), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000010"), bx("00000000")}, | ||
po: limitPO(22), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000001"), bx("00000000")}, | ||
po: limitPO(23), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000000"), bx("10000000")}, | ||
po: limitPO(24), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000000"), bx("01000000")}, | ||
po: limitPO(25), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000000"), bx("00100000")}, | ||
po: limitPO(26), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000000"), bx("00010000")}, | ||
po: limitPO(27), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000000"), bx("00001000")}, | ||
po: limitPO(28), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000000"), bx("00000100")}, | ||
po: limitPO(29), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000000"), bx("00000010")}, | ||
po: limitPO(30), | ||
}, | ||
{ | ||
addr: []byte{bx("00000000"), bx("00000000"), bx("00000000"), bx("00000001")}, | ||
po: limitPO(31), | ||
}, | ||
} { | ||
got := uint8(Proximity(base, tc.addr)) | ||
if got != tc.po { | ||
t.Errorf("got %v bin, want %v", got, tc.po) | ||
} | ||
} | ||
} |