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package flatex
import (
"bytes"
stdflate "compress/flate"
"testing"
)
func compressDeflate(t *testing.T, payload, dict []byte) []byte {
t.Helper()
var buf bytes.Buffer
var (
w *stdflate.Writer
err error
)
if dict != nil {
w, err = stdflate.NewWriterDict(&buf, stdflate.DefaultCompression, dict)
} else {
w, err = stdflate.NewWriter(&buf, stdflate.DefaultCompression)
}
if err != nil {
t.Fatalf("NewWriter: %v", err)
}
if _, err := w.Write(payload); err != nil {
t.Fatalf("Write: %v", err)
}
if err := w.Close(); err != nil {
t.Fatalf("Close: %v", err)
}
return buf.Bytes()
}
func TestDecompress(t *testing.T) {
payload := bytes.Repeat([]byte("golang"), 32)
compressed := compressDeflate(t, payload, nil)
out, _, err := Decompress(compressed)
if err != nil {
t.Fatalf("Decompress: %v", err)
}
defer out.Release()
if !bytes.Equal(out.Bytes(), payload) {
t.Fatalf("unexpected payload: got %q", out.Bytes())
}
}
func TestDecompressDict(t *testing.T) {
dict := []byte("furgit dictionary payload")
payload := append([]byte(nil), dict...)
payload = append(payload, []byte(" -- and some more data repeated -- and some more data repeated")...)
compressed := compressDeflate(t, payload, dict)
out, _, err := DecompressDict(compressed, dict)
if err != nil {
t.Fatalf("DecompressDict: %v", err)
}
defer out.Release()
if !bytes.Equal(out.Bytes(), payload) {
t.Fatalf("unexpected payload: got %q", out.Bytes())
}
}
func TestDecompressDictMissing(t *testing.T) {
dict := []byte("shared prefix to enforce dictionary usage")
payload := append([]byte(nil), dict...)
payload = append(payload, []byte(" trailing data to force reference")...)
compressed := compressDeflate(t, payload, dict)
if _, _, err := Decompress(compressed); err == nil {
t.Fatalf("expected error when dictionary missing")
}
}
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