182 lines
7.7 KiB
Go
182 lines
7.7 KiB
Go
// Copyright 2017 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package bitutil
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import (
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"bytes"
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"math/rand"
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"testing"
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"github.com/ethereum/go-ethereum/common/hexutil"
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)
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// Tests that data bitset encoding and decoding works and is bijective.
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func TestEncodingCycle(t *testing.T) {
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tests := []string{
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// Tests generated by go-fuzz to maximize code coverage
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"0x000000000000000000",
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"0xef0400",
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"0xdf7070533534333636313639343638373532313536346c1bc33339343837313070706336343035336336346c65fefb3930393233383838ac2f65fefb",
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"0x7b64000000",
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"0x000034000000000000",
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"0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f0000000000000000000",
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"0x4912385c0e7b64000000",
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"0x000034000000000000000000000000000000",
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"0x00",
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"0x000003e834ff7f0000",
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"0x0000",
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"0x0000000000000000000000000000000000000000000000000000000000ff00",
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"0x895f0c6a020f850c6a020f85f88df88d",
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"0xdf7070533534333636313639343638373432313536346c1bc3315aac2f65fefb",
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"0x0000000000",
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"0xdf70706336346c65fefb",
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"0x00006d643634000000",
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"0xdf7070533534333636313639343638373532313536346c1bc333393438373130707063363430353639343638373532313536346c1bc333393438336336346c65fe",
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}
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for i, tt := range tests {
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data := hexutil.MustDecode(tt)
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proc, err := bitsetDecodeBytes(bitsetEncodeBytes(data), len(data))
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if err != nil {
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t.Errorf("test %d: failed to decompress compressed data: %v", i, err)
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continue
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}
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if !bytes.Equal(data, proc) {
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t.Errorf("test %d: compress/decompress mismatch: have %x, want %x", i, proc, data)
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}
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}
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}
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// Tests that data bitset decoding and rencoding works and is bijective.
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func TestDecodingCycle(t *testing.T) {
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tests := []struct {
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size int
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input string
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fail error
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}{
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{size: 0, input: "0x"},
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// Crashers generated by go-fuzz
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{size: 0, input: "0x0020", fail: errUnreferencedData},
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{size: 0, input: "0x30", fail: errUnreferencedData},
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{size: 1, input: "0x00", fail: errUnreferencedData},
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{size: 2, input: "0x07", fail: errMissingData},
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{size: 1024, input: "0x8000", fail: errZeroContent},
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// Tests generated by go-fuzz to maximize code coverage
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{size: 29490, input: "0x343137343733323134333839373334323073333930783e3078333930783e70706336346c65303e", fail: errMissingData},
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{size: 59395, input: "0x00", fail: errUnreferencedData},
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{size: 52574, input: "0x70706336346c65c0de", fail: errExceededTarget},
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{size: 42264, input: "0x07", fail: errMissingData},
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{size: 52, input: "0xa5045bad48f4", fail: errExceededTarget},
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{size: 52574, input: "0xc0de", fail: errMissingData},
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{size: 52574, input: "0x"},
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{size: 29490, input: "0x34313734373332313433383937333432307333393078073034333839373334323073333930783e3078333937333432307333393078073061333930783e70706336346c65303e", fail: errMissingData},
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{size: 29491, input: "0x3973333930783e30783e", fail: errMissingData},
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{size: 1024, input: "0x808080608080"},
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{size: 1024, input: "0x808470705e3632383337363033313434303137393130306c6580ef46806380635a80"},
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{size: 1024, input: "0x8080808070"},
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{size: 1024, input: "0x808070705e36346c6580ef46806380635a80"},
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{size: 1024, input: "0x80808046802680"},
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{size: 1024, input: "0x4040404035"},
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{size: 1024, input: "0x4040bf3ba2b3f684402d353234373438373934409fe5b1e7ada94ebfd7d0505e27be4035"},
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{size: 1024, input: "0x404040bf3ba2b3f6844035"},
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{size: 1024, input: "0x40402d35323437343837393440bfd7d0505e27be4035"},
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}
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for i, tt := range tests {
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data := hexutil.MustDecode(tt.input)
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orig, err := bitsetDecodeBytes(data, tt.size)
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if err != tt.fail {
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t.Errorf("test %d: failure mismatch: have %v, want %v", i, err, tt.fail)
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}
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if err != nil {
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continue
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}
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if comp := bitsetEncodeBytes(orig); !bytes.Equal(comp, data) {
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t.Errorf("test %d: decompress/compress mismatch: have %x, want %x", i, comp, data)
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}
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}
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}
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// TestCompression tests that compression works by returning either the bitset
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// encoded input, or the actual input if the bitset version is longer.
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func TestCompression(t *testing.T) {
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// Check the the compression returns the bitset encoding is shorter
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in := hexutil.MustDecode("0x4912385c0e7b64000000")
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out := hexutil.MustDecode("0x80fe4912385c0e7b64")
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if data := CompressBytes(in); bytes.Compare(data, out) != 0 {
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t.Errorf("encoding mismatch for sparse data: have %x, want %x", data, out)
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}
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if data, err := DecompressBytes(out, len(in)); err != nil || bytes.Compare(data, in) != 0 {
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t.Errorf("decoding mismatch for sparse data: have %x, want %x, error %v", data, in, err)
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}
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// Check the the compression returns the input if the bitset encoding is longer
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in = hexutil.MustDecode("0xdf7070533534333636313639343638373532313536346c1bc33339343837313070706336343035336336346c65fefb3930393233383838ac2f65fefb")
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out = hexutil.MustDecode("0xdf7070533534333636313639343638373532313536346c1bc33339343837313070706336343035336336346c65fefb3930393233383838ac2f65fefb")
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if data := CompressBytes(in); bytes.Compare(data, out) != 0 {
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t.Errorf("encoding mismatch for dense data: have %x, want %x", data, out)
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}
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if data, err := DecompressBytes(out, len(in)); err != nil || bytes.Compare(data, in) != 0 {
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t.Errorf("decoding mismatch for dense data: have %x, want %x, error %v", data, in, err)
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}
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// Check that decompressing a longer input than the target fails
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if _, err := DecompressBytes([]byte{0xc0, 0x01, 0x01}, 2); err != errExceededTarget {
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t.Errorf("decoding error mismatch for long data: have %v, want %v", err, errExceededTarget)
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}
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}
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// Crude benchmark for compressing random slices of bytes.
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func BenchmarkEncoding1KBVerySparse(b *testing.B) { benchmarkEncoding(b, 1024, 0.0001) }
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func BenchmarkEncoding2KBVerySparse(b *testing.B) { benchmarkEncoding(b, 2048, 0.0001) }
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func BenchmarkEncoding4KBVerySparse(b *testing.B) { benchmarkEncoding(b, 4096, 0.0001) }
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func BenchmarkEncoding1KBSparse(b *testing.B) { benchmarkEncoding(b, 1024, 0.001) }
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func BenchmarkEncoding2KBSparse(b *testing.B) { benchmarkEncoding(b, 2048, 0.001) }
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func BenchmarkEncoding4KBSparse(b *testing.B) { benchmarkEncoding(b, 4096, 0.001) }
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func BenchmarkEncoding1KBDense(b *testing.B) { benchmarkEncoding(b, 1024, 0.1) }
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func BenchmarkEncoding2KBDense(b *testing.B) { benchmarkEncoding(b, 2048, 0.1) }
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func BenchmarkEncoding4KBDense(b *testing.B) { benchmarkEncoding(b, 4096, 0.1) }
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func BenchmarkEncoding1KBSaturated(b *testing.B) { benchmarkEncoding(b, 1024, 0.5) }
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func BenchmarkEncoding2KBSaturated(b *testing.B) { benchmarkEncoding(b, 2048, 0.5) }
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func BenchmarkEncoding4KBSaturated(b *testing.B) { benchmarkEncoding(b, 4096, 0.5) }
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func benchmarkEncoding(b *testing.B, bytes int, fill float64) {
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// Generate a random slice of bytes to compress
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random := rand.NewSource(0) // reproducible and comparable
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data := make([]byte, bytes)
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bits := int(float64(bytes) * 8 * fill)
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for i := 0; i < bits; i++ {
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idx := random.Int63() % int64(len(data))
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bit := uint(random.Int63() % 8)
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data[idx] |= 1 << bit
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}
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// Reset the benchmark and measure encoding/decoding
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b.ResetTimer()
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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bitsetDecodeBytes(bitsetEncodeBytes(data), len(data))
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}
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}
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