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// uint256: Fixed size 256-bit math library
// Copyright 2020 uint256 Authors
// SPDX-License-Identifier: BSD-3-Clause
package uint256
import (
"errors"
"fmt"
"math/big"
"testing"
)
// Test SetFromDecimal
func testSetFromDec(tc string) error {
a := new(Int).SetAllOne()
err := a.SetFromDecimal(tc)
{ // Check the FromDecimal too
b, err2 := FromDecimal(tc)
if (err == nil) != (err2 == nil) {
return fmt.Errorf("err != err2: %v %v", err, err2)
}
// Test the MustFromDecimal too
if err != nil {
if !causesPanic(func() { MustFromDecimal(tc) }) {
return errors.New("expected panic")
}
} else {
MustFromDecimal(tc) // must not manic
}
if err == nil {
if a.Cmp(b) != 0 {
return fmt.Errorf("a != b: %v %v", a, b)
}
}
}
// If input is negative, we should eror
if len(tc) > 0 && tc[0] == '-' {
if err == nil {
return fmt.Errorf("want error on negative input")
}
return nil
}
// Need to compare with big.Int
bigA, ok := big.NewInt(0).SetString(tc, 10)
if !ok {
if err == nil {
return fmt.Errorf("want error")
}
return nil // both agree that input is bad
}
if bigA.BitLen() > 256 {
if err == nil {
return fmt.Errorf("want error (bitlen > 256)")
}
return nil
}
want := bigA.String()
have := a.Dec()
if want != have {
return fmt.Errorf("want %v, have %v", want, have)
}
return nil
}
var cases = []string{
"0000000000000000000000000000000000000000000000000000000000000000000000000000000",
"0000000000000000000000000000000000000000000000000000000000000000000000000000097",
"-000000000000000000000000000000000000000000000000000000000000000000000000000000",
"1157920892373161954235709850086879078532699846656405640394575840079131296399351",
"215792089237316195423570985008687907853269984665640564039457584007913129639935",
"115792089237316195423570985008687907853269984665640564039457584007913129639935",
"15792089237316195423570985008687907853269984665640564039457584007913129639935",
"+115792089237316195423570985008687907853269984665640564039457584007913129639935",
"115792089237316195423570985008687907853269984665640564039457584007913129639936",
"115792089237316195423570985008687907853269984665640564039457584007913129639935",
"+0b00000000000000000000000000000000000000000000000000000000000000010",
"340282366920938463463374607431768211456",
"3402823669209384634633746074317682114561",
"+3402823669209384634633746074317682114561",
"+-3402823669209384634633746074317682114561",
"40282366920938463463374607431768211456",
"00000000000000000000000097",
"184467440737095516161",
"8446744073709551616",
"banana",
"+0x10",
"000",
"+000",
"010",
"0xab",
"-10",
"01",
"ab",
"0",
"-0",
"+0",
"",
"熊熊熊熊熊熊熊熊",
"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"-0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"0x10101011010",
"熊熊熊熊熊熊熊熊",
"0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"-0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"-0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
"0x10000000000000000000000000000000000000000000000000000000000000000",
"+0x10000000000000000000000000000000000000000000000000000000000000000",
"+0x00000000000000000000000000000000000000000000000000000000000000000",
"-0x00000000000000000000000000000000000000000000000000000000000000000",
}
func TestStringScan(t *testing.T) {
for i, tc := range cases {
if err := testSetFromDec(tc); err != nil {
t.Errorf("test %d, input '%s', SetFromDecimal err: %v", i, tc, err)
}
// TODO testSetFromHex(tc)
}
}
func FuzzBase10StringCompare(f *testing.F) {
for _, tc := range cases {
f.Add(tc)
}
f.Fuzz(func(t *testing.T, tc string) {
if err := testSetFromDec(tc); err != nil {
t.Errorf("input '%s', SetFromDecimal err: %v", tc, err)
}
// TODO testSetFromHex(tc)
})
}
func BenchmarkFromDecimalString(b *testing.B) {
input := twoPow256Sub1
b.Run("big", func(b *testing.B) {
val := new(big.Int)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
for j := 1; j < len(input); j++ {
if _, ok := val.SetString(input[:j], 10); !ok {
b.Fatalf("Error on %v", string(input[:j]))
}
}
}
})
b.Run("uint256", func(b *testing.B) {
val := new(Int)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
for j := 1; j < len(input); j++ {
if err := val.SetFromDecimal(input[:j]); err != nil {
b.Fatalf("%v: %v", err, string(input[:j]))
}
}
}
})
}
|
