Example #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 == 3 {
			values = []byte{0, 0, 32, 15, -4 & 0xFF, 16, 0, 16, 0, 7, -1 & 0xFF, -4 & 0xFF, -32 & 0xFF, 0, 31, -1 & 0xFF}
		} else if ii == 2 {
			values = []byte{0x3d, 0x4d, 0x54, 0x47, 0x5a, 0x36, 0x39, 0x26, 0x72, 0x6f, 0x6c, 0x65, 0x3d, 0x70, 0x72, 0x65}
		} else if ii == 4 {
			values = []byte{65, 71, 74, 66, 76, 65, 69, 77, 74, 79, 68, 75, 73, 72, 77, 68, 78, 65, 79, 79, 78, 66, 77, 71, 64, 70, 74, 77, 64, 67, 71, 64}
		} else if ii == 1 {
			values = make([]byte, 32)

			for i := range values {
				values[i] = byte(2) // all identical
			}
		} else if ii == 5 {
			values = make([]byte, 32)

			for i := range values {
				values[i] = byte(2 + (i & 1)) // 2 symbols
			}
		} else {
			values = make([]byte, 32)

			for i := range values {
				values[i] = byte(64 + 3*ii + rand.Intn(ii+1))
			}
		}

		fmt.Printf("\nOriginal: ")

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

		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)
		dbgbs.ShowByte(true)
		dbgbs.Mark(true)
		hc, _ := entropy.NewANSRangeEncoder(dbgbs)

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

		hc.Dispose()
		dbgbs.Close()
		println()

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

		hd, _ := entropy.NewANSRangeDecoder(dbgbs2)

		ok := true
		values2 := make([]byte, len(values))
		if _, err := hd.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)
		}

		hd.Dispose()
		println()
	}
}
Example #2
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{17, 8, 30, 28, 6, 26, 2, 9, 31, 0, 15, 30, 11, 27, 17, 11, 24, 6, 10, 24, 15, 10, 16, 13, 6, 21, 1, 18, 0, 3, 23, 6}
		} 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.NewExpGolombEncoder(dbgbs, signed)

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

		fpc.Dispose()
		dbgbs.Close()

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

		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.NewExpGolombDecoder(dbgbs2, signed)

		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")
	}
}