decodedsource/reader_test.go at main · saveweb/decodedsource · GitHub

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package decodedsource

import (
	"bytes"
	"compress/gzip"
	"encoding/base64"
	"io"
	"testing"

	"github.com/klauspost/compress/zstd"
	"github.com/pierrec/lz4/v4"
	"github.com/ulikunitz/xz"
)

var testPayload = []byte("WARC/1.1\r\nContent-Length: 0\r\n\r\n\r\n\r\n")

func TestNewReaderExplicitAndAuto(t *testing.T) {
	tests := []struct {
		name        string
		compression Compression
		encode      func(*testing.T, []byte) []byte
	}{
		{name: "plain", compression: CompressionPlain, encode: func(_ *testing.T, data []byte) []byte { return data }},
		{name: "gzip", compression: CompressionGzip, encode: gzipBytes},
		{name: "zstd", compression: CompressionZstd, encode: zstdBytes},
		{name: "bzip2", compression: CompressionBzip2, encode: bzip2Bytes},
		{name: "xz", compression: CompressionXZ, encode: xzBytes},
		{name: "lz4", compression: CompressionLZ4, encode: lz4Bytes},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			encoded := tt.encode(t, testPayload)
			for _, compression := range []Compression{tt.compression, CompressionAuto} {
				reader, err := NewReader(bytes.NewReader(encoded), compression)
				if err != nil {
					t.Fatal(err)
				}
				decoded, readErr := io.ReadAll(reader)
				closeErr := reader.Close()
				if readErr != nil {
					t.Fatal(readErr)
				}
				if closeErr != nil {
					t.Fatal(closeErr)
				}
				if !bytes.Equal(decoded, testPayload) {
					t.Fatalf("decoded = %q, want %q", decoded, testPayload)
				}
			}
		})
	}
}

func TestNewReaderRejectsUnknownCompression(t *testing.T) {
	_, err := NewReader(bytes.NewReader(nil), Compression(255))
	if err == nil {
		t.Fatal("NewReader accepted unknown compression")
	}
}

func gzipBytes(t *testing.T, data []byte) []byte {
	t.Helper()
	var out bytes.Buffer
	writer := gzip.NewWriter(&out)
	if _, err := writer.Write(data); err != nil {
		t.Fatal(err)
	}
	if err := writer.Close(); err != nil {
		t.Fatal(err)
	}
	return out.Bytes()
}

func zstdBytes(t *testing.T, data []byte) []byte {
	t.Helper()
	var out bytes.Buffer
	writer, err := zstd.NewWriter(&out)
	if err != nil {
		t.Fatal(err)
	}
	if _, err := writer.Write(data); err != nil {
		t.Fatal(err)
	}
	if err := writer.Close(); err != nil {
		t.Fatal(err)
	}
	return out.Bytes()
}

func xzBytes(t *testing.T, data []byte) []byte {
	t.Helper()
	var out bytes.Buffer
	writer, err := xz.NewWriter(&out)
	if err != nil {
		t.Fatal(err)
	}
	if _, err := writer.Write(data); err != nil {
		t.Fatal(err)
	}
	if err := writer.Close(); err != nil {
		t.Fatal(err)
	}
	return out.Bytes()
}

func lz4Bytes(t *testing.T, data []byte) []byte {
	t.Helper()
	var out bytes.Buffer
	writer := lz4.NewWriter(&out)
	if _, err := writer.Write(data); err != nil {
		t.Fatal(err)
	}
	if err := writer.Close(); err != nil {
		t.Fatal(err)
	}
	return out.Bytes()
}

func bzip2Bytes(t *testing.T, _ []byte) []byte {
	t.Helper()
	const encoded = "QlpoOTFBWSZTWTBtifkAAAvfgAASQAPgECgEEIACwYQAIAAhqZBo0GmmhTCaaA0xCkLGEK8TymFdmXfDbXicRygj4u5IpwoSBg2xPyA="
	data, err := base64.StdEncoding.DecodeString(encoded)
	if err != nil {
		t.Fatal(err)
	}
	return data
}