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: \n")
for i := range values {
fmt.Printf("%d ", values[i])
}
fmt.Printf("\nEncoded: \n")
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.NewHuffmanEncoder(dbgbs)
if _, err := hc.Encode(values); err != nil {
fmt.Printf("Error during encoding: %s", err)
os.Exit(1)
}
hc.Dispose()
dbgbs.Close()
fmt.Printf("\nDecoded: \n")
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.NewHuffmanDecoder(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)
}
println()
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()
}
}
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)
iter := 4000
size := 50000
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
}
b := byte(rand.Intn(256))
for j := i0; j < i0+length; j++ {
values1[j] = b
i++
}
}
oFile, _ := util.NewByteArrayOutputStream(buffer, false)
defer oFile.Close()
obs, _ := bitstream.NewDefaultOutputBitStream(oFile, uint(size))
rc, _ := entropy.NewHuffmanEncoder(obs)
// 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()
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.NewHuffmanDecoder(ibs)
// 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()
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()
}
fmt.Printf("Encode [ms] : %d\n", delta1/1000000)
fmt.Printf("Throughput [KB/s]: %d\n", (int64(iter*size))*1000000/delta1*1000/1024)
fmt.Printf("Decode [ms] : %d\n", delta2/1000000)
fmt.Printf("Throughput [KB/s]: %d\n", (int64(iter*size))*1000000/delta2*1000/1024)
}
}