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Diffstat (limited to 'common/bitutil/compress_test.go')
| -rw-r--r-- | common/bitutil/compress_test.go | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/common/bitutil/compress_test.go b/common/bitutil/compress_test.go new file mode 100644 index 000000000..805ab0369 --- /dev/null +++ b/common/bitutil/compress_test.go @@ -0,0 +1,181 @@ +// 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 bitutil + +import ( + "bytes" + "math/rand" + "testing" + + "github.com/ethereum/go-ethereum/common/hexutil" +) + +// Tests that data bitset encoding and decoding works and is bijective. +func TestEncodingCycle(t *testing.T) { + tests := []string{ + // Tests generated by go-fuzz to maximize code coverage + "0x000000000000000000", + "0xef0400", + "0xdf7070533534333636313639343638373532313536346c1bc33339343837313070706336343035336336346c65fefb3930393233383838ac2f65fefb", + "0x7b64000000", + "0x000034000000000000", + "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f0000000000000000000", + "0x4912385c0e7b64000000", + "0x000034000000000000000000000000000000", + "0x00", + "0x000003e834ff7f0000", + "0x0000", + "0x0000000000000000000000000000000000000000000000000000000000ff00", + "0x895f0c6a020f850c6a020f85f88df88d", + "0xdf7070533534333636313639343638373432313536346c1bc3315aac2f65fefb", + "0x0000000000", + "0xdf70706336346c65fefb", + "0x00006d643634000000", + "0xdf7070533534333636313639343638373532313536346c1bc333393438373130707063363430353639343638373532313536346c1bc333393438336336346c65fe", + } + for i, tt := range tests { + data := hexutil.MustDecode(tt) + + proc, err := bitsetDecodeBytes(bitsetEncodeBytes(data), len(data)) + if err != nil { + t.Errorf("test %d: failed to decompress compressed data: %v", i, err) + continue + } + if !bytes.Equal(data, proc) { + t.Errorf("test %d: compress/decompress mismatch: have %x, want %x", i, proc, data) + } + } +} + +// Tests that data bitset decoding and rencoding works and is bijective. +func TestDecodingCycle(t *testing.T) { + tests := []struct { + size int + input string + fail error + }{ + {size: 0, input: "0x"}, + + // Crashers generated by go-fuzz + {size: 0, input: "0x0020", fail: errUnreferencedData}, + {size: 0, input: "0x30", fail: errUnreferencedData}, + {size: 1, input: "0x00", fail: errUnreferencedData}, + {size: 2, input: "0x07", fail: errMissingData}, + {size: 1024, input: "0x8000", fail: errZeroContent}, + + // Tests generated by go-fuzz to maximize code coverage + {size: 29490, input: "0x343137343733323134333839373334323073333930783e3078333930783e70706336346c65303e", fail: errMissingData}, + {size: 59395, input: "0x00", fail: errUnreferencedData}, + {size: 52574, input: "0x70706336346c65c0de", fail: errExceededTarget}, + {size: 42264, input: "0x07", fail: errMissingData}, + {size: 52, input: "0xa5045bad48f4", fail: errExceededTarget}, + {size: 52574, input: "0xc0de", fail: errMissingData}, + {size: 52574, input: "0x"}, + {size: 29490, input: "0x34313734373332313433383937333432307333393078073034333839373334323073333930783e3078333937333432307333393078073061333930783e70706336346c65303e", fail: errMissingData}, + {size: 29491, input: "0x3973333930783e30783e", fail: errMissingData}, + + {size: 1024, input: "0x808080608080"}, + {size: 1024, input: "0x808470705e3632383337363033313434303137393130306c6580ef46806380635a80"}, + {size: 1024, input: "0x8080808070"}, + {size: 1024, input: "0x808070705e36346c6580ef46806380635a80"}, + {size: 1024, input: "0x80808046802680"}, + {size: 1024, input: "0x4040404035"}, + {size: 1024, input: "0x4040bf3ba2b3f684402d353234373438373934409fe5b1e7ada94ebfd7d0505e27be4035"}, + {size: 1024, input: "0x404040bf3ba2b3f6844035"}, + {size: 1024, input: "0x40402d35323437343837393440bfd7d0505e27be4035"}, + } + for i, tt := range tests { + data := hexutil.MustDecode(tt.input) + + orig, err := bitsetDecodeBytes(data, tt.size) + if err != tt.fail { + t.Errorf("test %d: failure mismatch: have %v, want %v", i, err, tt.fail) + } + if err != nil { + continue + } + if comp := bitsetEncodeBytes(orig); !bytes.Equal(comp, data) { + t.Errorf("test %d: decompress/compress mismatch: have %x, want %x", i, comp, data) + } + } +} + +// TestCompression tests that compression works by returning either the bitset +// encoded input, or the actual input if the bitset version is longer. +func TestCompression(t *testing.T) { + // Check the the compression returns the bitset encoding is shorter + in := hexutil.MustDecode("0x4912385c0e7b64000000") + out := hexutil.MustDecode("0x80fe4912385c0e7b64") + + if data := CompressBytes(in); bytes.Compare(data, out) != 0 { + t.Errorf("encoding mismatch for sparse data: have %x, want %x", data, out) + } + if data, err := DecompressBytes(out, len(in)); err != nil || bytes.Compare(data, in) != 0 { + t.Errorf("decoding mismatch for sparse data: have %x, want %x, error %v", data, in, err) + } + // Check the the compression returns the input if the bitset encoding is longer + in = hexutil.MustDecode("0xdf7070533534333636313639343638373532313536346c1bc33339343837313070706336343035336336346c65fefb3930393233383838ac2f65fefb") + out = hexutil.MustDecode("0xdf7070533534333636313639343638373532313536346c1bc33339343837313070706336343035336336346c65fefb3930393233383838ac2f65fefb") + + if data := CompressBytes(in); bytes.Compare(data, out) != 0 { + t.Errorf("encoding mismatch for dense data: have %x, want %x", data, out) + } + if data, err := DecompressBytes(out, len(in)); err != nil || bytes.Compare(data, in) != 0 { + t.Errorf("decoding mismatch for dense data: have %x, want %x, error %v", data, in, err) + } + // Check that decompressing a longer input than the target fails + if _, err := DecompressBytes([]byte{0xc0, 0x01, 0x01}, 2); err != errExceededTarget { + t.Errorf("decoding error mismatch for long data: have %v, want %v", err, errExceededTarget) + } +} + +// Crude benchmark for compressing random slices of bytes. +func BenchmarkEncoding1KBVerySparse(b *testing.B) { benchmarkEncoding(b, 1024, 0.0001) } +func BenchmarkEncoding2KBVerySparse(b *testing.B) { benchmarkEncoding(b, 2048, 0.0001) } +func BenchmarkEncoding4KBVerySparse(b *testing.B) { benchmarkEncoding(b, 4096, 0.0001) } + +func BenchmarkEncoding1KBSparse(b *testing.B) { benchmarkEncoding(b, 1024, 0.001) } +func BenchmarkEncoding2KBSparse(b *testing.B) { benchmarkEncoding(b, 2048, 0.001) } +func BenchmarkEncoding4KBSparse(b *testing.B) { benchmarkEncoding(b, 4096, 0.001) } + +func BenchmarkEncoding1KBDense(b *testing.B) { benchmarkEncoding(b, 1024, 0.1) } +func BenchmarkEncoding2KBDense(b *testing.B) { benchmarkEncoding(b, 2048, 0.1) } +func BenchmarkEncoding4KBDense(b *testing.B) { benchmarkEncoding(b, 4096, 0.1) } + +func BenchmarkEncoding1KBSaturated(b *testing.B) { benchmarkEncoding(b, 1024, 0.5) } +func BenchmarkEncoding2KBSaturated(b *testing.B) { benchmarkEncoding(b, 2048, 0.5) } +func BenchmarkEncoding4KBSaturated(b *testing.B) { benchmarkEncoding(b, 4096, 0.5) } + +func benchmarkEncoding(b *testing.B, bytes int, fill float64) { + // Generate a random slice of bytes to compress + random := rand.NewSource(0) // reproducible and comparable + + data := make([]byte, bytes) + bits := int(float64(bytes) * 8 * fill) + + for i := 0; i < bits; i++ { + idx := random.Int63() % int64(len(data)) + bit := uint(random.Int63() % 8) + data[idx] |= 1 << bit + } + // Reset the benchmark and measure encoding/decoding + b.ResetTimer() + b.ReportAllocs() + for i := 0; i < b.N; i++ { + bitsetDecodeBytes(bitsetEncodeBytes(data), len(data)) + } +} |