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package zlibx
import (
"bytes"
stdzlib "compress/zlib"
"testing"
)
func compressZlib(t *testing.T, payload, dict []byte) []byte {
t.Helper()
var buf bytes.Buffer
var (
w *stdzlib.Writer
err error
)
if dict != nil {
w, err = stdzlib.NewWriterLevelDict(&buf, stdzlib.DefaultCompression, dict)
} else {
w = stdzlib.NewWriter(&buf)
}
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 := []byte("hello, zlib world!")
compressed := compressZlib(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 %q", out.Bytes())
}
}
func TestDecompressDict(t *testing.T) {
dict := []byte("git dictionary for zlib")
payload := append([]byte(nil), dict...)
payload = append(payload, []byte(" -- extended body -- extended body")...)
compressed := compressZlib(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 %q", out.Bytes())
}
}
func TestDecompressDictMissing(t *testing.T) {
dict := []byte("preset dictionary")
payload := append([]byte(nil), dict...)
payload = append(payload, []byte(" .. more data ..")...)
compressed := compressZlib(t, payload, dict)
if _, err := Decompress(compressed); err != ErrDictionary {
t.Fatalf("expected ErrDictionary, got %v", err)
}
}
func TestDecompressChecksumError(t *testing.T) {
payload := []byte("checksum check")
compressed := compressZlib(t, payload, nil)
compressed[len(compressed)-1] ^= 0xff
if _, err := Decompress(compressed); err != ErrChecksum {
t.Fatalf("expected ErrChecksum, got %v", err)
}
}
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