forked from cerc-io/plugeth
common/number: delete unused package (#16983)
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.
This commit is contained in:
Felix Lange
Péter Szilágyi
parent
c343f75c26
commit
aa34173f13
@ -1,197 +0,0 @@
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// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package number
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import (
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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)
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var (
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tt256 = new(big.Int).Lsh(big.NewInt(1), 256)
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tt256m1 = new(big.Int).Sub(new(big.Int).Lsh(big.NewInt(1), 256), big.NewInt(1))
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tt255 = new(big.Int).Lsh(big.NewInt(1), 255)
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)
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func limitUnsigned256(x *Number) *Number {
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x.num.And(x.num, tt256m1)
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return x
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}
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func limitSigned256(x *Number) *Number {
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if x.num.Cmp(tt255) < 0 {
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return x
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}
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x.num.Sub(x.num, tt256)
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return x
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}
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// Initialiser is a Number function
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type Initialiser func(n int64) *Number
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// A Number represents a generic integer with a bounding function limiter. Limit is called after each operations
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// to give "fake" bounded integers. New types of Number can be created through NewInitialiser returning a lambda
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// with the new Initialiser.
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type Number struct {
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num *big.Int
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limit func(n *Number) *Number
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}
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// NewInitialiser returns a new initialiser for a new *Number without having to expose certain fields
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func NewInitialiser(limiter func(*Number) *Number) Initialiser {
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return func(n int64) *Number {
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return &Number{big.NewInt(n), limiter}
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}
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}
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// Uint256 returns a Number with a UNSIGNED limiter up to 256 bits
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func Uint256(n int64) *Number {
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return &Number{big.NewInt(n), limitUnsigned256}
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}
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// Int256 returns Number with a SIGNED limiter up to 256 bits
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func Int256(n int64) *Number {
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return &Number{big.NewInt(n), limitSigned256}
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}
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// Big returns a Number with a SIGNED unlimited size
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func Big(n int64) *Number {
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return &Number{big.NewInt(n), func(x *Number) *Number { return x }}
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}
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// Add sets i to sum of x+y
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func (i *Number) Add(x, y *Number) *Number {
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i.num.Add(x.num, y.num)
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return i.limit(i)
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}
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// Sub sets i to difference of x-y
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func (i *Number) Sub(x, y *Number) *Number {
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i.num.Sub(x.num, y.num)
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return i.limit(i)
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}
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// Mul sets i to product of x*y
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func (i *Number) Mul(x, y *Number) *Number {
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i.num.Mul(x.num, y.num)
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return i.limit(i)
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}
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// Div sets i to the quotient prodject of x/y
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func (i *Number) Div(x, y *Number) *Number {
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i.num.Div(x.num, y.num)
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return i.limit(i)
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}
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// Mod sets i to x % y
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func (i *Number) Mod(x, y *Number) *Number {
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i.num.Mod(x.num, y.num)
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return i.limit(i)
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}
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// Lsh sets i to x << s
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func (i *Number) Lsh(x *Number, s uint) *Number {
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i.num.Lsh(x.num, s)
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return i.limit(i)
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}
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// Pow sets i to x^y
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func (i *Number) Pow(x, y *Number) *Number {
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i.num.Exp(x.num, y.num, big.NewInt(0))
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return i.limit(i)
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}
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// Setters
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// Set sets x to i
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func (i *Number) Set(x *Number) *Number {
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i.num.Set(x.num)
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return i.limit(i)
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}
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// SetBytes sets x bytes to i
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func (i *Number) SetBytes(x []byte) *Number {
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i.num.SetBytes(x)
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return i.limit(i)
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}
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// Cmp compares x and y and returns:
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//
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// -1 if x < y
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// 0 if x == y
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// +1 if x > y
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func (i *Number) Cmp(x *Number) int {
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return i.num.Cmp(x.num)
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}
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// Getters
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// String returns the string representation of i
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func (i *Number) String() string {
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return i.num.String()
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}
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// Bytes returns the byte representation of i
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func (i *Number) Bytes() []byte {
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return i.num.Bytes()
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}
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// Uint64 returns the Uint64 representation of x. If x cannot be represented in an int64, the result is undefined.
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func (i *Number) Uint64() uint64 {
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return i.num.Uint64()
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}
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// Int64 returns the int64 representation of x. If x cannot be represented in an int64, the result is undefined.
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func (i *Number) Int64() int64 {
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return i.num.Int64()
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}
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// Int256 returns the signed version of i
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func (i *Number) Int256() *Number {
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return Int(0).Set(i)
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}
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// Uint256 returns the unsigned version of i
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func (i *Number) Uint256() *Number {
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return Uint(0).Set(i)
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}
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// FirstBitSet returns the index of the first bit that's set to 1
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func (i *Number) FirstBitSet() int {
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for j := 0; j < i.num.BitLen(); j++ {
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if i.num.Bit(j) > 0 {
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return j
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}
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}
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return i.num.BitLen()
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}
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// Variables
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var (
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Zero = Uint(0)
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One = Uint(1)
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Two = Uint(2)
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MaxUint256 = Uint(0).SetBytes(common.Hex2Bytes("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"))
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MinOne = Int(-1)
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// "typedefs"
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Uint = Uint256
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Int = Int256
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)
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@ -1,108 +0,0 @@
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// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package number
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import (
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"math/big"
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"testing"
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"github.com/ethereum/go-ethereum/common"
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)
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func TestSet(t *testing.T) {
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a := Uint(0)
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b := Uint(10)
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a.Set(b)
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if a.num.Cmp(b.num) != 0 {
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t.Error("didn't compare", a, b)
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}
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c := Uint(0).SetBytes(common.Hex2Bytes("0a"))
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if c.num.Cmp(big.NewInt(10)) != 0 {
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t.Error("c set bytes failed.")
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}
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}
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func TestInitialiser(t *testing.T) {
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check := false
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init := NewInitialiser(func(x *Number) *Number {
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check = true
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return x
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})
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a := init(0).Add(init(1), init(2))
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if a.Cmp(init(3)) != 0 {
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t.Error("expected 3. got", a)
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}
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if !check {
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t.Error("expected limiter to be called")
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}
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}
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func TestGet(t *testing.T) {
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a := Uint(10)
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if a.Uint64() != 10 {
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t.Error("expected to get 10. got", a.Uint64())
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}
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a = Uint(10)
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if a.Int64() != 10 {
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t.Error("expected to get 10. got", a.Int64())
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}
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}
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func TestCmp(t *testing.T) {
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a := Uint(10)
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b := Uint(10)
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c := Uint(11)
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if a.Cmp(b) != 0 {
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t.Error("a b == 0 failed", a, b)
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}
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if a.Cmp(c) >= 0 {
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t.Error("a c < 0 failed", a, c)
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}
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if c.Cmp(b) <= 0 {
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t.Error("c b > 0 failed", c, b)
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}
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}
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func TestMaxArith(t *testing.T) {
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a := Uint(0).Add(MaxUint256, One)
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if a.Cmp(Zero) != 0 {
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t.Error("expected max256 + 1 = 0 got", a)
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}
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a = Uint(0).Sub(Uint(0), One)
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if a.Cmp(MaxUint256) != 0 {
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t.Error("expected 0 - 1 = max256 got", a)
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}
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a = Int(0).Sub(Int(0), One)
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if a.Cmp(MinOne) != 0 {
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t.Error("expected 0 - 1 = -1 got", a)
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}
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}
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func TestConversion(t *testing.T) {
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a := Int(-1)
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b := a.Uint256()
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if b.Cmp(MaxUint256) != 0 {
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t.Error("expected -1 => unsigned to return max. got", b)
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}
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}
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