1// Copyright 2021 Google LLC 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14// 15 16 17package mathfuzzer 18 19import "math/big" 20 21func FuzzBigIntCmp1(data []byte) int { 22 if !isDivisibleBy(len(data), 2) { 23 return -1 24 } 25 i1 := new(big.Int) 26 i2 := new(big.Int) 27 28 half := len(data) / 2 29 30 halfOne := data[:half] 31 halfTwo := data[half:] 32 33 i1.SetBytes(halfOne) 34 i2.SetBytes(halfTwo) 35 36 i1.Cmp(i2) 37 return 1 38} 39 40func FuzzBigIntCmp2(data []byte) int { 41 if !isDivisibleBy(len(data), 2) { 42 return -1 43 } 44 x, y := new(big.Int), new(big.Int) 45 half := len(data)/2 46 if err := x.UnmarshalText(data[:half]); err != nil { 47 return 0 48 } 49 if err := y.UnmarshalText(data[half:]); err != nil { 50 return 0 51 } 52 x.Cmp(y) 53 return 1 54} 55 56func FuzzRatSetString(data []byte) int { 57 _, _ = new(big.Rat).SetString(string(data)) 58 return 1 59} 60 61func isDivisibleBy(n int, divisibleby int) bool { 62 return (n % divisibleby) == 0 63} 64