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generated by cgit (git 2.34.1) at 2025-07-27 11:46:34 +0800

// Copyright 2017 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 math

import (
    "bytes"
    "encoding/hex"
    "math/big"
    "testing"

    "github.com/ethereum/go-ethereum/common"
)

func TestHexOrDecimal256(t *testing.T) {
    tests := []struct {
        input string
        num   *big.Int
        ok    bool
    }{
        {"", big.NewInt(0), true},
        {"0", big.NewInt(0), true},
        {"0x0", big.NewInt(0), true},
        {"12345678", big.NewInt(12345678), true},
        {"0x12345678", big.NewInt(0x12345678), true},
        {"0X12345678", big.NewInt(0x12345678), true},
        // Tests for leading zero behaviour:
        {"0123456789", big.NewInt(123456789), true}, // note: not octal
        {"00", big.NewInt(0), true},
        {"0x00", big.NewInt(0), true},
        {"0x012345678abc", big.NewInt(0x12345678abc), true},
        // Invalid syntax:
        {"abcdef", nil, false},
        {"0xgg", nil, false},
        // Larger than 256 bits:
        {"115792089237316195423570985008687907853269984665640564039457584007913129639936", nil, false},
    }
    for _, test := range tests {
        var num HexOrDecimal256
        err := num.UnmarshalText([]byte(test.input))
        if (err == nil) != test.ok {
            t.Errorf("ParseBig(%q) -> (err == nil) == %t, want %t", test.input, err == nil, test.ok)
            continue
        }
        if test.num != nil && (*big.Int)(&num).Cmp(test.num) != 0 {
            t.Errorf("ParseBig(%q) -> %d, want %d", test.input, (*big.Int)(&num), test.num)
        }
    }
}

func TestMustParseBig256(t *testing.T) {
    defer func() {
        if recover() == nil {
            t.Error("MustParseBig should've panicked")
        }
    }()
    MustParseBig256("ggg")
}

func TestBigMax(t *testing.T) {
    a := big.NewInt(10)
    b := big.NewInt(5)

    max1 := BigMax(a, b)
    if max1 != a {
        t.Errorf("Expected %d got %d", a, max1)
    }

    max2 := BigMax(b, a)
    if max2 != a {
        t.Errorf("Expected %d got %d", a, max2)
    }
}

func TestBigMin(t *testing.T) {
    a := big.NewInt(10)
    b := big.NewInt(5)

    min1 := BigMin(a, b)
    if min1 != b {
        t.Errorf("Expected %d got %d", b, min1)
    }

    min2 := BigMin(b, a)
    if min2 != b {
        t.Errorf("Expected %d got %d", b, min2)
    }
}

func TestFirstBigSet(t *testing.T) {
    tests := []struct {
        num *big.Int
        ix  int
    }{
        {big.NewInt(0), 0},
        {big.NewInt(1), 0},
        {big.NewInt(2), 1},
        {big.NewInt(0x100), 8},
    }
    for _, test := range tests {
        if ix := FirstBitSet(test.num); ix != test.ix {
            t.Errorf("FirstBitSet(b%b) = %d, want %d", test.num, ix, test.ix)
        }
    }
}

func TestPaddedBigBytes(t *testing.T) {
    tests := []struct {
        num    *big.Int
        n      int
        result []byte
    }{
        {num: big.NewInt(0), n: 4, result: []byte{0, 0, 0, 0}},
        {num: big.NewInt(1), n: 4, result: []byte{0, 0, 0, 1}},
        {num: big.NewInt(512), n: 4, result: []byte{0, 0, 2, 0}},
        {num: BigPow(2, 32), n: 4, result: []byte{1, 0, 0, 0, 0}},
    }
    for _, test := range tests {
        if result := PaddedBigBytes(test.num, test.n); !bytes.Equal(result, test.result) {
            t.Errorf("PaddedBigBytes(%d, %d) = %v, want %v", test.num, test.n, result, test.result)
        }
    }
}

func BenchmarkPaddedBigBytesLargePadding(b *testing.B) {
    bigint := MustParseBig256("123456789123456789123456789123456789")
    for i := 0; i < b.N; i++ {
        PaddedBigBytes(bigint, 200)
    }
}

func BenchmarkPaddedBigBytesSmallPadding(b *testing.B) {
    bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC")
    for i := 0; i < b.N; i++ {
        PaddedBigBytes(bigint, 5)
    }
}

func BenchmarkPaddedBigBytesSmallOnePadding(b *testing.B) {
    bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC")
    for i := 0; i < b.N; i++ {
        PaddedBigBytes(bigint, 32)
    }
}

func BenchmarkByteAtBrandNew(b *testing.B) {
    bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC")
    for i := 0; i < b.N; i++ {
        bigEndianByteAt(bigint, 15)
    }
}

func BenchmarkByteAt(b *testing.B) {
    bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC")
    for i := 0; i < b.N; i++ {
        bigEndianByteAt(bigint, 15)
    }
}

func BenchmarkByteAtOld(b *testing.B) {

    bigint := MustParseBig256("0x18F8F8F1000111000110011100222004330052300000000000000000FEFCF3CC")
    for i := 0; i < b.N; i++ {
        PaddedBigBytes(bigint, 32)
    }
}

func TestReadBits(t *testing.T) {
    check := func(input string) {
        want, _ := hex.DecodeString(input)
        int, _ := new(big.Int).SetString(input, 16)
        buf := make([]byte, len(want))
        ReadBits(int, buf)
        if !bytes.Equal(buf, want) {
            t.Errorf("have: %x\nwant: %x", buf, want)
        }
    }
    check("000000000000000000000000000000000000000000000000000000FEFCF3F8F0")
    check("0000000000012345000000000000000000000000000000000000FEFCF3F8F0")
    check("18F8F8F1000111000110011100222004330052300000000000000000FEFCF3F8F0")
}

func TestU256(t *testing.T) {
    tests := []struct{ x, y *big.Int }{
        {x: big.NewInt(0), y: big.NewInt(0)},
        {x: big.NewInt(1), y: big.NewInt(1)},
        {x: BigPow(2, 255), y: BigPow(2, 255)},
        {x: BigPow(2, 256), y: big.NewInt(0)},
        {x: new(big.Int).Add(BigPow(2, 256), big.NewInt(1)), y: big.NewInt(1)},
        // negative values
        {x: big.NewInt(-1), y: new(big.Int).Sub(BigPow(2, 256), big.NewInt(1))},
        {x: big.NewInt(-2), y: new(big.Int).Sub(BigPow(2, 256), big.NewInt(2))},
        {x: BigPow(2, -255), y: big.NewInt(1)},
    }
    for _, test := range tests {
        if y := U256(new(big.Int).Set(test.x)); y.Cmp(test.y) != 0 {
            t.Errorf("U256(%x) = %x, want %x", test.x, y, test.y)
        }
    }
}

func TestBigEndianByteAt(t *testing.T) {
    tests := []struct {
        x   string
        y   int
        exp byte
    }{
        {"00", 0, 0x00},
        {"01", 1, 0x00},
        {"00", 1, 0x00},
        {"01", 0, 0x01},
        {"0000000000000000000000000000000000000000000000000000000000102030", 0, 0x30},
        {"0000000000000000000000000000000000000000000000000000000000102030", 1, 0x20},
        {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 31, 0xAB},
        {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 32, 0x00},
        {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 500, 0x00},
    }
    for _, test := range tests {
        v := new(big.Int).SetBytes(common.Hex2Bytes(test.x))
        actual := bigEndianByteAt(v, test.y)
        if actual != test.exp {
            t.Fatalf("Expected  [%v] %v:th byte to be %v, was %v.", test.x, test.y, test.exp, actual)
        }

    }
}
func TestLittleEndianByteAt(t *testing.T) {
    tests := []struct {
        x   string
        y   int
        exp byte
    }{
        {"00", 0, 0x00},
        {"01", 1, 0x00},
        {"00", 1, 0x00},
        {"01", 0, 0x00},
        {"0000000000000000000000000000000000000000000000000000000000102030", 0, 0x00},
        {"0000000000000000000000000000000000000000000000000000000000102030", 1, 0x00},
        {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 31, 0x00},
        {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 32, 0x00},
        {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 0, 0xAB},
        {"ABCDEF0908070605040302010000000000000000000000000000000000000000", 1, 0xCD},
        {"00CDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff", 0, 0x00},
        {"00CDEF090807060504030201ffffffffffffffffffffffffffffffffffffffff", 1, 0xCD},
        {"0000000000000000000000000000000000000000000000000000000000102030", 31, 0x30},
        {"0000000000000000000000000000000000000000000000000000000000102030", 30, 0x20},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 32, 0x0},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 31, 0xFF},
        {"ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 0xFFFF, 0x0},
    }
    for _, test := range tests {
        v := new(big.Int).SetBytes(common.Hex2Bytes(test.x))
        actual := Byte(v, 32, test.y)
        if actual != test.exp {
            t.Fatalf("Expected  [%v] %v:th byte to be %v, was %v.", test.x, test.y, test.exp, actual)
        }

    }
}

func TestS256(t *testing.T) {
    tests := []struct{ x, y *big.Int }{
        {x: big.NewInt(0), y: big.NewInt(0)},
        {x: big.NewInt(1), y: big.NewInt(1)},
        {x: big.NewInt(2), y: big.NewInt(2)},
        {
            x: new(big.Int).Sub(BigPow(2, 255), big.NewInt(1)),
            y: new(big.Int).Sub(BigPow(2, 255), big.NewInt(1)),
        },
        {
            x: BigPow(2, 255),
            y: new(big.Int).Neg(BigPow(2, 255)),
        },
        {
            x: new(big.Int).Sub(BigPow(2, 256), big.NewInt(1)),
            y: big.NewInt(-1),
        },
        {
            x: new(big.Int).Sub(BigPow(2, 256), big.NewInt(2)),
            y: big.NewInt(-2),
        },
    }
    for _, test := range tests {
        if y := S256(test.x); y.Cmp(test.y) != 0 {
            t.Errorf("S256(%x) = %x, want %x", test.x, y, test.y)
        }
    }
}

func TestExp(t *testing.T) {
    tests := []struct{ base, exponent, result *big.Int }{
        {base: big.NewInt(0), exponent: big.NewInt(0), result: big.NewInt(1)},
        {base: big.NewInt(1), exponent: big.NewInt(0), result: big.NewInt(1)},
        {base: big.NewInt(1), exponent: big.NewInt(1), result: big.NewInt(1)},
        {base: big.NewInt(1), exponent: big.NewInt(2), result: big.NewInt(1)},
        {base: big.NewInt(3), exponent: big.NewInt(144), result: MustParseBig256("507528786056415600719754159741696356908742250191663887263627442114881")},
        {base: big.NewInt(2), exponent: big.NewInt(255), result: MustParseBig256("57896044618658097711785492504343953926634992332820282019728792003956564819968")},
    }
    for _, test := range tests {
        if result := Exp(test.base, test.exponent); result.Cmp(test.result) != 0 {
            t.Errorf("Exp(%d, %d) = %d, want %d", test.base, test.exponent, result, test.result)
        }
    }
}