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")
}
}
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 := 4000
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.NewExpGolombEncoder(obs, true)
// 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.NewExpGolombDecoder(ibs, true)
// 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)
}
}