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common/number: delete unused package (#16983)

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This package was meant to hold an improved 256 bit integer library, but
the effort was abandoned in 2015. AFAIK nothing ever used this package.
Time to say goodbye.
pull/16985/head
Felix Lange 6 years ago committed by Péter Szilágyi
parent c343f75c26
commit aa34173f13
2 changed files with 0 additions and 305 deletions
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  1. 197
      common/number/int.go
  2. 108
      common/number/uint_test.go

197
common/number/int.go
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@ -1,197 +0,0 @@
// Copyright 2015 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 number
import (
"math/big"
"github.com/ethereum/go-ethereum/common"
)
var (
tt256 = new(big.Int).Lsh(big.NewInt(1), 256)
tt256m1 = new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(1))
tt255 = new(big.Int).Lsh(big.NewInt(1), 255)
)
func limitUnsigned256(x *Number) *Number {
x.num.And(x.num, tt256m1)
return x
}
func limitSigned256(x *Number) *Number {
if x.num.Cmp(tt255) < 0 {
return x
}
x.num.Sub(x.num, tt256)
return x
}
// Initialiser is a Number function
type Initialiser func(n int64) *Number
// A Number represents a generic integer with a bounding function limiter. Limit is called after each operations
// to give "fake" bounded integers. New types of Number can be created through NewInitialiser returning a lambda
// with the new Initialiser.
type Number struct {
num *big.Int
limit func(n *Number) *Number
}
// NewInitialiser returns a new initialiser for a new *Number without having to expose certain fields
func NewInitialiser(limiter func(*Number) *Number) Initialiser {
return func(n int64) *Number {
return &Number{big.NewInt(n), limiter}
}
}
// Uint256 returns a Number with a UNSIGNED limiter up to 256 bits
func Uint256(n int64) *Number {
return &Number{big.NewInt(n), limitUnsigned256}
}
// Int256 returns Number with a SIGNED limiter up to 256 bits
func Int256(n int64) *Number {
return &Number{big.NewInt(n), limitSigned256}
}
// Big returns a Number with a SIGNED unlimited size
func Big(n int64) *Number {
return &Number{big.NewInt(n), func(x *Number) *Number { return x }}
}
// Add sets i to sum of x+y
func (i *Number) Add(x, y *Number) *Number {
i.num.Add(x.num, y.num)
return i.limit(i)
}
// Sub sets i to difference of x-y
func (i *Number) Sub(x, y *Number) *Number {
i.num.Sub(x.num, y.num)
return i.limit(i)
}
// Mul sets i to product of x*y
func (i *Number) Mul(x, y *Number) *Number {
i.num.Mul(x.num, y.num)
return i.limit(i)
}
// Div sets i to the quotient prodject of x/y
func (i *Number) Div(x, y *Number) *Number {
i.num.Div(x.num, y.num)
return i.limit(i)
}
// Mod sets i to x % y
func (i *Number) Mod(x, y *Number) *Number {
i.num.Mod(x.num, y.num)
return i.limit(i)
}
// Lsh sets i to x << s
func (i *Number) Lsh(x *Number, s uint) *Number {
i.num.Lsh(x.num, s)
return i.limit(i)
}
// Pow sets i to x^y
func (i *Number) Pow(x, y *Number) *Number {
i.num.Exp(x.num, y.num, big.NewInt(0))
return i.limit(i)
}
// Setters
// Set sets x to i
func (i *Number) Set(x *Number) *Number {
i.num.Set(x.num)
return i.limit(i)
}
// SetBytes sets x bytes to i
func (i *Number) SetBytes(x []byte) *Number {
i.num.SetBytes(x)
return i.limit(i)
}
// Cmp compares x and y and returns:
//
// -1 if x < y
// 0 if x == y
// +1 if x > y
func (i *Number) Cmp(x *Number) int {
return i.num.Cmp(x.num)
}
// Getters
// String returns the string representation of i
func (i *Number) String() string {
return i.num.String()
}
// Bytes returns the byte representation of i
func (i *Number) Bytes() []byte {
return i.num.Bytes()
}
// Uint64 returns the Uint64 representation of x. If x cannot be represented in an int64, the result is undefined.
func (i *Number) Uint64() uint64 {
return i.num.Uint64()
}
// Int64 returns the int64 representation of x. If x cannot be represented in an int64, the result is undefined.
func (i *Number) Int64() int64 {
return i.num.Int64()
}
// Int256 returns the signed version of i
func (i *Number) Int256() *Number {
return Int(0).Set(i)
}
// Uint256 returns the unsigned version of i
func (i *Number) Uint256() *Number {
return Uint(0).Set(i)
}
// FirstBitSet returns the index of the first bit that's set to 1
func (i *Number) FirstBitSet() int {
for j := 0; j < i.num.BitLen(); j++ {
if i.num.Bit(j) > 0 {
return j
}
}
return i.num.BitLen()
}
// Variables
var (
Zero = Uint(0)
One = Uint(1)
Two = Uint(2)
MaxUint256 = Uint(0).SetBytes(common.Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"))
MinOne = Int(-1)
// "typedefs"
Uint = Uint256
Int = Int256
)

108
common/number/uint_test.go
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// Copyright 2015 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 number
import (
"math/big"
"testing"
"github.com/ethereum/go-ethereum/common"
)
func TestSet(t *testing.T) {
a := Uint(0)
b := Uint(10)
a.Set(b)
if a.num.Cmp(b.num) != 0 {
t.Error("didn't compare", a, b)
}
c := Uint(0).SetBytes(common.Hex2Bytes("0a"))
if c.num.Cmp(big.NewInt(10)) != 0 {
t.Error("c set bytes failed.")
}
}
func TestInitialiser(t *testing.T) {
check := false
init := NewInitialiser(func(x *Number) *Number {
check = true
return x
})
a := init(0).Add(init(1), init(2))
if a.Cmp(init(3)) != 0 {
t.Error("expected 3. got", a)
}
if !check {
t.Error("expected limiter to be called")
}
}
func TestGet(t *testing.T) {
a := Uint(10)
if a.Uint64() != 10 {
t.Error("expected to get 10. got", a.Uint64())
}
a = Uint(10)
if a.Int64() != 10 {
t.Error("expected to get 10. got", a.Int64())
}
}
func TestCmp(t *testing.T) {
a := Uint(10)
b := Uint(10)
c := Uint(11)
if a.Cmp(b) != 0 {
t.Error("a b == 0 failed", a, b)
}
if a.Cmp(c) >= 0 {
t.Error("a c < 0 failed", a, c)
}
if c.Cmp(b) <= 0 {
t.Error("c b > 0 failed", c, b)
}
}
func TestMaxArith(t *testing.T) {
a := Uint(0).Add(MaxUint256, One)
if a.Cmp(Zero) != 0 {
t.Error("expected max256 + 1 = 0 got", a)
}
a = Uint(0).Sub(Uint(0), One)
if a.Cmp(MaxUint256) != 0 {
t.Error("expected 0 - 1 = max256 got", a)
}
a = Int(0).Sub(Int(0), One)
if a.Cmp(MinOne) != 0 {
t.Error("expected 0 - 1 = -1 got", a)
}
}
func TestConversion(t *testing.T) {
a := Int(-1)
b := a.Uint256()
if b.Cmp(MaxUint256) != 0 {
t.Error("expected -1 => unsigned to return max. got", b)
}
}
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