Beispiel #1
0
func TestCorrectness() {
	fmt.Printf("\n\nCorrectness test")

	// Test behavior
	for ii := 1; ii < 20; ii++ {
		fmt.Printf("\nTest %v", ii)
		var values []byte
		rand.Seed(time.Now().UTC().UnixNano())

		if ii == 1 {
			values = []byte{13, 3, 15, 11, 12, 14, 11, 15, 7, 9, 5, 7, 4, 3, 15, 12}
		} else {
			values = make([]byte, 32)

			for i := range values {
				values[i] = byte(rand.Intn(32) - 16*(ii&1))
			}
		}

		fmt.Printf("\nOriginal: ")

		for i := range values {
			fmt.Printf("%d ", values[i])
		}

		signed := true

		if ii&1 == 0 {
			signed = false
		}

		fmt.Printf("\nEncoded: ")
		buffer := make([]byte, 16384)
		oFile, _ := util.NewByteArrayOutputStream(buffer, true)
		defer oFile.Close()
		obs, _ := bitstream.NewDefaultOutputBitStream(oFile, 16384)
		dbgbs, _ := bitstream.NewDebugOutputBitStream(obs, os.Stdout)

		// Alternate signed / unsigned coding
		fpc, _ := entropy.NewRiceGolombEncoder(dbgbs, signed, 4)

		if _, err := fpc.Encode(values); err != nil {
			fmt.Printf("Error during encoding: %s", err)
			os.Exit(1)
		}

		fpc.Dispose()
		dbgbs.Close()
		println()

		iFile, _ := util.NewByteArrayInputStream(buffer, true)
		defer iFile.Close()
		ibs, _ := bitstream.NewDefaultInputBitStream(iFile, 16384)
		dbgbs2, _ := bitstream.NewDebugInputBitStream(ibs, os.Stdout)
		dbgbs2.Mark(true)

		fpd, _ := entropy.NewRiceGolombDecoder(dbgbs2, signed, 4)

		ok := true
		values2 := make([]byte, len(values))

		if _, err := fpd.Decode(values2); err != nil {
			fmt.Printf("Error during decoding: %s", err)
			os.Exit(1)
		}

		fmt.Printf("\nDecoded: ")

		for i := range values2 {
			fmt.Printf("%v ", values2[i])

			if values[i] != values2[i] {
				ok = false
			}
		}

		if ok == true {
			fmt.Printf("\nIdentical")
		} else {
			fmt.Printf("\n! *** Different *** !")
			os.Exit(1)
		}

		fpd.Dispose()
		dbgbs2.Close()
		fmt.Printf("\n")
	}
}
Beispiel #2
0
func TestSpeed() {
	fmt.Printf("\n\nSpeed test\n")
	repeats := []int{3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, 9, 3}

	for jj := 0; jj < 3; jj++ {
		fmt.Printf("Test %v\n", jj+1)
		delta1 := int64(0)
		delta2 := int64(0)
		size := 50000
		iter := 2000
		buffer := make([]byte, size*2)
		values1 := make([]byte, size)
		values2 := make([]byte, size)

		for ii := 0; ii < iter; ii++ {
			idx := jj

			for i := 0; i < len(values1); i++ {
				i0 := i

				length := repeats[idx]
				idx = (idx + 1) & 0x0F

				if i0+length >= len(values1) {
					length = 1
				}

				for j := i0; j < i0+length; j++ {
					values1[j] = byte(i0)
					i++
				}
			}

			oFile, _ := util.NewByteArrayOutputStream(buffer, false)
			defer oFile.Close()
			obs, _ := bitstream.NewDefaultOutputBitStream(oFile, uint(size))
			rc, _ := entropy.NewRiceGolombEncoder(obs, true, 4)

			// Encode
			before := time.Now()

			if _, err := rc.Encode(values1); err != nil {
				fmt.Printf("An error occured during encoding: %v\n", err)
				os.Exit(1)
			}

			rc.Dispose()
			obs.Close()

			if _, err := obs.Close(); err != nil {
				fmt.Printf("Error during close: %v\n", err)
				os.Exit(1)
			}

			after := time.Now()
			delta1 += after.Sub(before).Nanoseconds()
		}

		for ii := 0; ii < iter; ii++ {
			iFile, _ := util.NewByteArrayInputStream(buffer, false)
			defer iFile.Close()
			ibs, _ := bitstream.NewDefaultInputBitStream(iFile, uint(size))
			rd, _ := entropy.NewRiceGolombDecoder(ibs, true, 4)

			// Decode
			before := time.Now()

			if _, err := rd.Decode(values2); err != nil {
				fmt.Printf("An error occured during decoding: %v\n", err)
				os.Exit(1)
			}

			rd.Dispose()
			ibs.Close()

			if _, err := ibs.Close(); err != nil {
				fmt.Printf("Error during close: %v\n", err)
				os.Exit(1)
			}

			after := time.Now()
			delta2 += after.Sub(before).Nanoseconds()
		}

		prod := int64(iter) * int64(size)
		fmt.Printf("Encode [ms]      : %d\n", delta1/1000000)
		fmt.Printf("Throughput [KB/s]: %d\n", prod*1000000/delta1*1000/1024)
		fmt.Printf("Decode [ms]      : %d\n", delta2/1000000)
		fmt.Printf("Throughput [KB/s]: %d\n", prod*1000000/delta2*1000/1024)
	}
}