Dan Willemsen | bc60c3c | 2021-12-15 01:09:00 -0800 | [diff] [blame] | 1 | // Copyright 2021 The Go Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style |
| 3 | // license that can be found in the LICENSE file. |
| 4 | |
| 5 | package fuzz |
| 6 | |
| 7 | import ( |
| 8 | "bytes" |
| 9 | "testing" |
| 10 | ) |
| 11 | |
| 12 | type mockRand struct { |
| 13 | values []int |
| 14 | counter int |
| 15 | b bool |
| 16 | } |
| 17 | |
| 18 | func (mr *mockRand) uint32() uint32 { |
| 19 | c := mr.values[mr.counter] |
| 20 | mr.counter++ |
| 21 | return uint32(c) |
| 22 | } |
| 23 | |
| 24 | func (mr *mockRand) intn(n int) int { |
| 25 | c := mr.values[mr.counter] |
| 26 | mr.counter++ |
| 27 | return c % n |
| 28 | } |
| 29 | |
| 30 | func (mr *mockRand) uint32n(n uint32) uint32 { |
| 31 | c := mr.values[mr.counter] |
| 32 | mr.counter++ |
| 33 | return uint32(c) % n |
| 34 | } |
| 35 | |
| 36 | func (mr *mockRand) exp2() int { |
| 37 | c := mr.values[mr.counter] |
| 38 | mr.counter++ |
| 39 | return c |
| 40 | } |
| 41 | |
| 42 | func (mr *mockRand) bool() bool { |
| 43 | b := mr.b |
| 44 | mr.b = !mr.b |
| 45 | return b |
| 46 | } |
| 47 | |
| 48 | func (mr *mockRand) save(*uint64, *uint64) { |
| 49 | panic("unimplemented") |
| 50 | } |
| 51 | |
| 52 | func (mr *mockRand) restore(uint64, uint64) { |
| 53 | panic("unimplemented") |
| 54 | } |
| 55 | |
| 56 | func TestByteSliceMutators(t *testing.T) { |
| 57 | for _, tc := range []struct { |
| 58 | name string |
| 59 | mutator func(*mutator, []byte) []byte |
| 60 | randVals []int |
| 61 | input []byte |
| 62 | expected []byte |
| 63 | }{ |
| 64 | { |
| 65 | name: "byteSliceRemoveBytes", |
| 66 | mutator: byteSliceRemoveBytes, |
| 67 | input: []byte{1, 2, 3, 4}, |
| 68 | expected: []byte{4}, |
| 69 | }, |
| 70 | { |
| 71 | name: "byteSliceInsertRandomBytes", |
| 72 | mutator: byteSliceInsertRandomBytes, |
| 73 | input: make([]byte, 4, 8), |
| 74 | expected: []byte{3, 4, 5, 0, 0, 0, 0}, |
| 75 | }, |
| 76 | { |
| 77 | name: "byteSliceDuplicateBytes", |
| 78 | mutator: byteSliceDuplicateBytes, |
| 79 | input: append(make([]byte, 0, 13), []byte{1, 2, 3, 4}...), |
| 80 | expected: []byte{1, 1, 2, 3, 4, 2, 3, 4}, |
| 81 | }, |
| 82 | { |
| 83 | name: "byteSliceOverwriteBytes", |
| 84 | mutator: byteSliceOverwriteBytes, |
| 85 | input: []byte{1, 2, 3, 4}, |
| 86 | expected: []byte{1, 1, 3, 4}, |
| 87 | }, |
| 88 | { |
| 89 | name: "byteSliceBitFlip", |
| 90 | mutator: byteSliceBitFlip, |
| 91 | input: []byte{1, 2, 3, 4}, |
| 92 | expected: []byte{3, 2, 3, 4}, |
| 93 | }, |
| 94 | { |
| 95 | name: "byteSliceXORByte", |
| 96 | mutator: byteSliceXORByte, |
| 97 | input: []byte{1, 2, 3, 4}, |
| 98 | expected: []byte{3, 2, 3, 4}, |
| 99 | }, |
| 100 | { |
| 101 | name: "byteSliceSwapByte", |
| 102 | mutator: byteSliceSwapByte, |
| 103 | input: []byte{1, 2, 3, 4}, |
| 104 | expected: []byte{2, 1, 3, 4}, |
| 105 | }, |
| 106 | { |
| 107 | name: "byteSliceArithmeticUint8", |
| 108 | mutator: byteSliceArithmeticUint8, |
| 109 | input: []byte{1, 2, 3, 4}, |
| 110 | expected: []byte{255, 2, 3, 4}, |
| 111 | }, |
| 112 | { |
| 113 | name: "byteSliceArithmeticUint16", |
| 114 | mutator: byteSliceArithmeticUint16, |
| 115 | input: []byte{1, 2, 3, 4}, |
| 116 | expected: []byte{1, 3, 3, 4}, |
| 117 | }, |
| 118 | { |
| 119 | name: "byteSliceArithmeticUint32", |
| 120 | mutator: byteSliceArithmeticUint32, |
| 121 | input: []byte{1, 2, 3, 4}, |
| 122 | expected: []byte{2, 2, 3, 4}, |
| 123 | }, |
| 124 | { |
| 125 | name: "byteSliceArithmeticUint64", |
| 126 | mutator: byteSliceArithmeticUint64, |
| 127 | input: []byte{1, 2, 3, 4, 5, 6, 7, 8}, |
| 128 | expected: []byte{2, 2, 3, 4, 5, 6, 7, 8}, |
| 129 | }, |
| 130 | { |
| 131 | name: "byteSliceOverwriteInterestingUint8", |
| 132 | mutator: byteSliceOverwriteInterestingUint8, |
| 133 | input: []byte{1, 2, 3, 4}, |
| 134 | expected: []byte{255, 2, 3, 4}, |
| 135 | }, |
| 136 | { |
| 137 | name: "byteSliceOverwriteInterestingUint16", |
| 138 | mutator: byteSliceOverwriteInterestingUint16, |
| 139 | input: []byte{1, 2, 3, 4}, |
| 140 | expected: []byte{255, 127, 3, 4}, |
| 141 | }, |
| 142 | { |
| 143 | name: "byteSliceOverwriteInterestingUint32", |
| 144 | mutator: byteSliceOverwriteInterestingUint32, |
| 145 | input: []byte{1, 2, 3, 4}, |
| 146 | expected: []byte{250, 0, 0, 250}, |
| 147 | }, |
| 148 | { |
| 149 | name: "byteSliceInsertConstantBytes", |
| 150 | mutator: byteSliceInsertConstantBytes, |
| 151 | input: append(make([]byte, 0, 8), []byte{1, 2, 3, 4}...), |
| 152 | expected: []byte{3, 3, 3, 1, 2, 3, 4}, |
| 153 | }, |
| 154 | { |
| 155 | name: "byteSliceOverwriteConstantBytes", |
| 156 | mutator: byteSliceOverwriteConstantBytes, |
| 157 | input: []byte{1, 2, 3, 4}, |
| 158 | expected: []byte{3, 3, 3, 4}, |
| 159 | }, |
| 160 | { |
| 161 | name: "byteSliceShuffleBytes", |
| 162 | mutator: byteSliceShuffleBytes, |
| 163 | input: []byte{1, 2, 3, 4}, |
| 164 | expected: []byte{2, 3, 1, 4}, |
| 165 | }, |
| 166 | { |
| 167 | name: "byteSliceSwapBytes", |
| 168 | mutator: byteSliceSwapBytes, |
| 169 | randVals: []int{0, 2, 0, 2}, |
| 170 | input: append(make([]byte, 0, 9), []byte{1, 2, 3, 4}...), |
| 171 | expected: []byte{3, 2, 1, 4}, |
| 172 | }, |
| 173 | } { |
| 174 | t.Run(tc.name, func(t *testing.T) { |
| 175 | r := &mockRand{values: []int{0, 1, 2, 3, 4, 5}} |
| 176 | if tc.randVals != nil { |
| 177 | r.values = tc.randVals |
| 178 | } |
| 179 | m := &mutator{r: r} |
| 180 | b := tc.mutator(m, tc.input) |
| 181 | if !bytes.Equal(b, tc.expected) { |
| 182 | t.Errorf("got %x, want %x", b, tc.expected) |
| 183 | } |
| 184 | }) |
| 185 | } |
| 186 | } |