Function TestCompressRegression

huff0/compress_test.go:93–222

(t *testing.T)

}

func TestCompressRegression(t *testing.T) {
	// Match the fuzz function
	var testInput = func(t *testing.T, data []byte) int {
		var enc Scratch
		enc.WantLogLess = 5
		comp, _, err := Compress1X(data, &enc)
		if err == ErrIncompressible || err == ErrUseRLE || err == ErrTooBig {
			return 0
		}
		if err != nil {
			panic(err)
		}
		if len(comp) >= len(data)-len(data)>>enc.WantLogLess {
			panic(fmt.Errorf("too large output provided. got %d, but should be < %d", len(comp), len(data)-len(data)>>enc.WantLogLess))
		}

		dec, remain, err := ReadTable(comp, nil)
		if err != nil {
			panic(err)
		}
		out, err := dec.Decompress1X(remain)
		if err != nil {
			t.Error(err)
		}
		if !bytes.Equal(out, data) {
			t.Error("decompression 1x mismatch")
		}
		// Reuse as 4X
		enc.Reuse = ReusePolicyAllow
		comp, reUsed, err := Compress4X(data, &enc)
		if err == ErrIncompressible || err == ErrUseRLE || err == ErrTooBig {
			return 0
		}
		if err != nil {
			panic(err)
		}
		if len(comp) >= len(data)-len(data)>>enc.WantLogLess {
			panic(fmt.Errorf("too large output provided. got %d, but should be < %d", len(comp), len(data)-len(data)>>enc.WantLogLess))
		}

		remain = comp
		if !reUsed {
			dec, remain, err = ReadTable(comp, dec)
			if err != nil {
				panic(err)
			}
		}
		out, err = dec.Decompress4X(remain, len(data))
		if err != nil {
			t.Error(err)
		}
		if !bytes.Equal(out, data) {
			t.Error("decompression 4x with reuse mismatch")
		}

		enc.Reuse = ReusePolicyNone
		comp, reUsed, err = Compress4X(data, &enc)
		if err == ErrIncompressible || err == ErrUseRLE || err == ErrTooBig {