| // Copyright 2019 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| package zopfli |
| |
| import ( |
| "bytes" |
| "compress/gzip" |
| "io/ioutil" |
| "math/rand" |
| "strings" |
| "testing" |
| ) |
| |
| func getRandomBytes(length uint64) []byte { |
| rng := rand.New(rand.NewSource(1)) // Make test repeatable. |
| data := make([]byte, length) |
| for i := uint64(0); i < length; i++ { |
| data[i] = (byte)(rng.Int()) |
| } |
| return data |
| } |
| |
| // TestGzip verifies that Gzip compresses data correctly. |
| func TestGzip(t *testing.T) { |
| compressibleString := "compressthis" + strings.Repeat("_foobar", 1000) + "$" |
| |
| for _, test := range []struct { |
| name string |
| data []byte |
| maxSize int |
| }{ |
| {"compressible string", []byte(compressibleString), 500}, |
| {"random binary data", getRandomBytes(3000), 3100}, |
| {"empty string", []byte(""), 20}, |
| } { |
| compressed := Gzip(test.data) |
| gzipReader, err := gzip.NewReader(bytes.NewReader(compressed)) |
| if err != nil { |
| t.Errorf("%s: gzip.NewReader: got error %v, expected no error", |
| test.name, err) |
| continue |
| } |
| decompressed, err := ioutil.ReadAll(gzipReader) |
| if err != nil { |
| t.Errorf("%s: reading gzip stream: got error %v, expected no error", |
| test.name, err) |
| continue |
| } |
| if bytes.Compare(test.data, decompressed) != 0 { |
| t.Errorf("%s: mismatch between input and decompressed data", test.name) |
| continue |
| } |
| if test.maxSize > 0 && len(compressed) > test.maxSize { |
| t.Errorf("%s: compressed data is %d bytes, expected %d or less", |
| test.name, len(compressed), test.maxSize) |
| } |
| } |
| } |