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// Copyright 2020 Google LLC All Rights Reserved.
//
// 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
//
// http://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 compression
import (
"bytes"
"io"
"testing"
"github.com/google/go-containerregistry/internal/and"
"github.com/google/go-containerregistry/internal/gzip"
"github.com/google/go-containerregistry/internal/zstd"
)
type Compressor = func(rc io.ReadCloser) io.ReadCloser
type Decompressor = func(rc io.ReadCloser) (io.ReadCloser, error)
func testPeekCompression(t *testing.T,
compressionExpected string,
compress Compressor,
decompress Decompressor,
) {
content := "This is the input string."
contentBuf := bytes.NewBufferString(content)
compressed := compress(io.NopCloser(contentBuf))
compressionDetected, pr, err := PeekCompression(compressed)
if err != nil {
t.Error("PeekCompression() =", err)
}
if got := string(compressionDetected); got != compressionExpected {
t.Errorf("PeekCompression(); got %q, content %q", got, compressionExpected)
}
decompressed, err := decompress(withCloser(pr, compressed))
if err != nil {
t.Fatal(err)
}
b, err := io.ReadAll(decompressed)
if err != nil {
t.Error("ReadAll() =", err)
}
if got := string(b); got != content {
t.Errorf("ReadAll(); got %q, content %q", got, content)
}
}
func TestPeekCompression(t *testing.T) {
testPeekCompression(t, "gzip", gzip.ReadCloser, gzip.UnzipReadCloser)
testPeekCompression(t, "zstd", zstd.ReadCloser, zstd.UnzipReadCloser)
nopCompress := func(rc io.ReadCloser) io.ReadCloser { return rc }
nopDecompress := func(rc io.ReadCloser) (io.ReadCloser, error) { return rc, nil }
testPeekCompression(t, "none", nopCompress, nopDecompress)
}
func withCloser(pr PeekReader, rc io.ReadCloser) io.ReadCloser {
return &and.ReadCloser{
Reader: pr,
CloseFunc: rc.Close,
}
}
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