// randFloat32 generates a random float taking the full range of a float32.
func randFloat32(rand *rand.Rand) float32 {
f := rand.Float64() * math.MaxFloat32
if rand.Int()&1 == 1 {
f = -f
}
return float32(f)
}
// randomN creates a random integer in [0..limit), using the space in z if
// possible. n is the bit length of limit.
func randomN(z []Word, rand *rand.Rand, limit []Word, n int) []Word {
bitLengthOfMSW := uint(n % _W)
if bitLengthOfMSW == 0 {
bitLengthOfMSW = _W
}
mask := Word((1 << bitLengthOfMSW) - 1)
z = makeN(z, len(limit), false)
for {
for i := range z {
switch _W {
case 32:
z[i] = Word(rand.Uint32())
case 64:
z[i] = Word(rand.Uint32()) | Word(rand.Uint32())<<32
}
}
z[len(limit)-1] &= mask
if cmpNN(z, limit) < 0 {
break
}
}
return normN(z)
}
// MontePathIn computes montecarlo distribution and flow for pathing
// in to the set minimum depth, N samples per start location.
func (f *Fill) MontePathIn(r *rand.Rand, start []Location, N int, MinDepth uint16) (dist []int, flow [][4]int) {
dist = make([]int, len(f.Depth))
flow = make([][4]int, len(f.Depth))
for _, origloc := range start {
for n := 0; n < N; n++ {
loc := origloc
d := 0
for d < 4 {
depth := f.Depth[loc]
nperm := r.Intn(24)
for d = 0; d < 4; d++ {
nloc := f.LocStep[loc][Perm4[nperm][d]]
if f.Depth[nloc] < depth && f.Depth[nloc] > MinDepth {
flow[loc][Perm4[nperm][d]]++
loc = nloc
dist[loc]++
break
}
}
}
}
}
return
}
// randFloat64 generates a random float taking the full range of a float64.
func randFloat64(rand *rand.Rand) float64 {
f := rand.Float64()
if rand.Int()&1 == 1 {
f = -f
}
return f
}
func (p *Trie) outputDot(vec *vector.StringVector, rune int, serial int64, rgen *rand.Rand) {
this := make([]byte, 10)
child := make([]byte, 10)
utf8.EncodeRune(this, rune)
thisChar := string(this[0])
if serial == -1 {
thisChar = "root"
}
for childRune, childNode := range p.children {
utf8.EncodeRune(child, childRune)
childSerial := rgen.Int63()
childNodeStr := fmt.Sprintf("\"%s(%d)\"", string(child[0]), childSerial)
var notation string
if string(child[0]) == "/" {
notation = fmt.Sprintf("[label=\"%s\" shape=box color=red]", string(child[0]))
} else {
notation = fmt.Sprintf("[label=\"%s\"]", string(child[0]))
}
vec.Push(fmt.Sprintf("\t%s %s\n\t\"%s(%d)\" -> \"%s(%d)\"", childNodeStr, notation, thisChar, serial, string(child[0]), childSerial))
childNode.outputDot(vec, childRune, childSerial, rgen)
}
}
// random creates a random integer in [0..limit), using the space in z if
// possible. n is the bit length of limit.
func (z nat) random(rand *rand.Rand, limit nat, n int) nat {
bitLengthOfMSW := uint(n % _W)
if bitLengthOfMSW == 0 {
bitLengthOfMSW = _W
}
mask := Word((1 << bitLengthOfMSW) - 1)
z = z.make(len(limit))
for {
for i := range z {
switch _W {
case 32:
z[i] = Word(rand.Uint32())
case 64:
z[i] = Word(rand.Uint32()) | Word(rand.Uint32())<<32
}
}
z[len(limit)-1] &= mask
if z.cmp(limit) < 0 {
break
}
}
return z.norm()
}
func (*certificateMsg) Generate(rand *rand.Rand, size int) reflect.Value {
m := &certificateMsg{}
numCerts := rand.Intn(20)
m.certificates = make([][]byte, numCerts)
for i := 0; i < numCerts; i++ {
m.certificates[i] = randomBytes(rand.Intn(10)+1, rand)
}
return reflect.ValueOf(m)
}
func (*certificateRequestMsg) Generate(rand *rand.Rand, size int) reflect.Value {
m := &certificateRequestMsg{}
m.certificateTypes = randomBytes(rand.Intn(5)+1, rand)
numCAs := rand.Intn(100)
m.certificateAuthorities = make([][]byte, numCAs)
for i := 0; i < numCAs; i++ {
m.certificateAuthorities[i] = randomBytes(rand.Intn(15)+1, rand)
}
return reflect.ValueOf(m)
}
func (*certificateStatusMsg) Generate(rand *rand.Rand, size int) reflect.Value {
m := &certificateStatusMsg{}
if rand.Intn(10) > 5 {
m.statusType = statusTypeOCSP
m.response = randomBytes(rand.Intn(10)+1, rand)
} else {
m.statusType = 42
}
return reflect.ValueOf(m)
}
func randomNameList(rand *rand.Rand) []string {
ret := make([]string, rand.Int31()&15)
for i := range ret {
s := make([]byte, 1+(rand.Int31()&15))
for j := range s {
s[j] = 'a' + uint8(rand.Int31()&15)
}
ret[i] = string(s)
}
return ret
}
func choose(fork forkChoice, random *rand.Rand) {
pivot := random.Float64() * fork.TotalMass()
fork.Reset()
for prob, _, ok := fork.Next(); ok; prob, _, ok = fork.Next() {
pivot -= prob
if pivot <= 0.0 {
fork.Pick()
return
}
}
}
// Sample returns N random points sampled from a fill with step
// distance between low and hi inclusive. it will return a count > 1
// if the sample size is smaller than N. If n < 1 then return all
// points.
func (f *Fill) Sample(r *rand.Rand, n, low, high int) ([]Location, []int) {
pool := make([]Location, 0, 200)
lo, hi := uint16(low), uint16(high)
for i, depth := range f.Depth {
if depth >= lo && depth <= hi {
pool = append(pool, Location(i))
}
}
if n < 1 {
return pool, nil
}
if len(pool) == 0 {
return nil, nil
}
over := n / len(pool)
perm := r.Perm(len(pool))[0 : n%len(pool)]
if Debug[DBG_Sample] {
log.Printf("Sample: Looking for %d explore points %d-%d, have %d possible", n, low, hi, len(pool))
}
var count []int
if over > 0 {
count = make([]int, len(pool))
for i := range count {
count[i] = over
}
} else {
count = make([]int, len(perm))
}
for i := range perm {
count[i]++
}
if over > 0 {
return pool, count
} else {
pout := make([]Location, len(perm))
for i, pi := range perm {
if Debug[DBG_Sample] {
log.Printf("Sample: adding location %d to output pool", pool[pi])
}
pout[i] = pool[pi]
}
return pout, count
}
return nil, nil
}
func (*clientHelloMsg) Generate(rand *rand.Rand, size int) reflect.Value {
m := &clientHelloMsg{}
m.major = uint8(rand.Intn(256))
m.minor = uint8(rand.Intn(256))
m.random = randomBytes(32, rand)
m.sessionId = randomBytes(rand.Intn(32), rand)
m.cipherSuites = make([]uint16, rand.Intn(63)+1)
for i := 0; i < len(m.cipherSuites); i++ {
m.cipherSuites[i] = uint16(rand.Int31())
}
m.compressionMethods = randomBytes(rand.Intn(63)+1, rand)
return reflect.NewValue(m)
}
func randomBytes(n int, rand *rand.Rand) []byte {
r := make([]byte, n)
for i := 0; i < n; i++ {
r[i] = byte(rand.Int31())
}
return r
}
func (b Bitmask) Generate(rand *rand.Rand, size int) reflect.Value {
result := Bitmask{
x: size - rand.Intn(size),
y: size - rand.Intn(size),
w: rand.Intn(size),
h: rand.Intn(size),
}
result.lines = make([][]part, result.h)
completeness := rand.Intn(size)
for y := 0; y < result.h; y++ {
result.lines[y] = make([]part, result.w/sz+1)
for x := 0; x < result.w; x++ {
result.SetRel(x, y, rand.Intn(completeness) == 0)
}
}
return reflect.NewValue(result)
}
func (*clientHelloMsg) Generate(rand *rand.Rand, size int) reflect.Value {
m := &clientHelloMsg{}
m.vers = uint16(rand.Intn(65536))
m.random = randomBytes(32, rand)
m.sessionId = randomBytes(rand.Intn(32), rand)
m.cipherSuites = make([]uint16, rand.Intn(63)+1)
for i := 0; i < len(m.cipherSuites); i++ {
m.cipherSuites[i] = uint16(rand.Int31())
}
m.compressionMethods = randomBytes(rand.Intn(63)+1, rand)
if rand.Intn(10) > 5 {
m.nextProtoNeg = true
}
if rand.Intn(10) > 5 {
m.serverName = randomString(rand.Intn(255), rand)
}
m.ocspStapling = rand.Intn(10) > 5
return reflect.NewValue(m)
}
func (*kexInitMsg) Generate(rand *rand.Rand, size int) reflect.Value {
ki := &kexInitMsg{}
randomBytes(ki.Cookie[:], rand)
ki.KexAlgos = randomNameList(rand)
ki.ServerHostKeyAlgos = randomNameList(rand)
ki.CiphersClientServer = randomNameList(rand)
ki.CiphersServerClient = randomNameList(rand)
ki.MACsClientServer = randomNameList(rand)
ki.MACsServerClient = randomNameList(rand)
ki.CompressionClientServer = randomNameList(rand)
ki.CompressionServerClient = randomNameList(rand)
ki.LanguagesClientServer = randomNameList(rand)
ki.LanguagesServerClient = randomNameList(rand)
if rand.Int31()&1 == 1 {
ki.FirstKexFollows = true
}
return reflect.ValueOf(ki)
}
func (s *shadowMap) Init(corr_dist float64, Rgen2 *rand.Rand) {
nval := int(Field / corr_dist / shadow_sampling)
//fmt.Println(" shadowMap down Sampling ", shadow_sampling, " ", nval)
s.xcos = make([]float64, nval)
s.ycos = make([]float64, nval)
s.xsin = make([]float64, nval)
s.ysin = make([]float64, nval)
for i := 0; i < nval; i++ {
s.xcos[i] = Rgen2.NormFloat64()
//s.xcos[i] *= s.xcos[i]
s.ycos[i] = Rgen2.NormFloat64()
s.xsin[i] = Rgen2.Float64() * 2 * math.Pi
s.ysin[i] = Rgen2.Float64() * 2 * math.Pi
if s.xcos[i] < mval {
s.xcos[i] = 0
}
if s.ycos[i] < mval {
s.ycos[i] = 0
}
s.power += s.xcos[i] * s.xcos[i]
s.power += s.ycos[i] * s.ycos[i]
}
s.power = math.Sqrt(s.power) / shadow_deviance
for i := 0; i < nval; i++ {
s.xcos[i] /= s.power
s.ycos[i] /= s.power
}
s.smap = make([][]float32, mapsize)
for i := 0; i < mapsize; i++ {
s.smap[i] = make([]float32, mapsize)
x := (float64(i) - mapsize/2) / mapres
for j := 0; j < mapsize; j++ {
d := geom.Pos{x, (float64(j) - mapsize/2) / mapres}
s.smap[i][j] = float32(s.evalShadowFadingDirect(d))
//lets not have -Inf here
if s.smap[i][j] < 0.0000001 {
s.smap[i][j] = 0.0000001
}
}
}
}
func (*serverHelloMsg) Generate(rand *rand.Rand, size int) reflect.Value {
m := &serverHelloMsg{}
m.vers = uint16(rand.Intn(65536))
m.random = randomBytes(32, rand)
m.sessionId = randomBytes(rand.Intn(32), rand)
m.cipherSuite = uint16(rand.Int31())
m.compressionMethod = uint8(rand.Intn(256))
if rand.Intn(10) > 5 {
m.nextProtoNeg = true
n := rand.Intn(10)
m.nextProtos = make([]string, n)
for i := 0; i < n; i++ {
m.nextProtos[i] = randomString(20, rand)
}
}
return reflect.ValueOf(m)
}
// Value returns an arbitrary value of the given type.
// If the type implements the Generator interface, that will be used.
// Note: in order to create arbitrary values for structs, all the members must be public.
func Value(t reflect.Type, rand *rand.Rand) (value reflect.Value, ok bool) {
if m, ok := reflect.Zero(t).Interface().(Generator); ok {
return m.Generate(rand, complexSize), true
}
switch concrete := t; concrete.Kind() {
case reflect.Bool:
return reflect.ValueOf(rand.Int()&1 == 0), true
case reflect.Float32:
return reflect.ValueOf(randFloat32(rand)), true
case reflect.Float64:
return reflect.ValueOf(randFloat64(rand)), true
case reflect.Complex64:
return reflect.ValueOf(complex(randFloat32(rand), randFloat32(rand))), true
case reflect.Complex128:
return reflect.ValueOf(complex(randFloat64(rand), randFloat64(rand))), true
case reflect.Int16:
return reflect.ValueOf(int16(randInt64(rand))), true
case reflect.Int32:
return reflect.ValueOf(int32(randInt64(rand))), true
case reflect.Int64:
return reflect.ValueOf(randInt64(rand)), true
case reflect.Int8:
return reflect.ValueOf(int8(randInt64(rand))), true
case reflect.Int:
return reflect.ValueOf(int(randInt64(rand))), true
case reflect.Uint16:
return reflect.ValueOf(uint16(randInt64(rand))), true
case reflect.Uint32:
return reflect.ValueOf(uint32(randInt64(rand))), true
case reflect.Uint64:
return reflect.ValueOf(uint64(randInt64(rand))), true
case reflect.Uint8:
return reflect.ValueOf(uint8(randInt64(rand))), true
case reflect.Uint:
return reflect.ValueOf(uint(randInt64(rand))), true
case reflect.Uintptr:
return reflect.ValueOf(uintptr(randInt64(rand))), true
case reflect.Map:
numElems := rand.Intn(complexSize)
m := reflect.MakeMap(concrete)
for i := 0; i < numElems; i++ {
key, ok1 := Value(concrete.Key(), rand)
value, ok2 := Value(concrete.Elem(), rand)
if !ok1 || !ok2 {
return reflect.Value{}, false
}
m.SetMapIndex(key, value)
}
return m, true
case reflect.Ptr:
v, ok := Value(concrete.Elem(), rand)
if !ok {
return reflect.Value{}, false
}
p := reflect.New(concrete.Elem())
p.Elem().Set(v)
return p, true
case reflect.Slice:
numElems := rand.Intn(complexSize)
s := reflect.MakeSlice(concrete, numElems, numElems)
for i := 0; i < numElems; i++ {
v, ok := Value(concrete.Elem(), rand)
if !ok {
return reflect.Value{}, false
}
s.Index(i).Set(v)
}
return s, true
case reflect.String:
numChars := rand.Intn(complexSize)
codePoints := make([]int, numChars)
for i := 0; i < numChars; i++ {
codePoints[i] = rand.Intn(0x10ffff)
}
return reflect.ValueOf(string(codePoints)), true
case reflect.Struct:
s := reflect.New(t).Elem()
for i := 0; i < s.NumField(); i++ {
v, ok := Value(concrete.Field(i).Type, rand)
if !ok {
return reflect.Value{}, false
}
s.Field(i).Set(v)
}
return s, true
default:
return reflect.Value{}, false
}
return
}
// Return a set of directions with d first, opposite last an the other 3 permuted.
func Permute5D(d Direction, r *rand.Rand) *[5]Direction {
return &PermStepD5[d][r.Intn(6)]
}
// Draw from the arrays with rand.Intn(120) for a random permutation of directions including NoMovement
func Permute5(r *rand.Rand) *[5]Direction {
return &Perm5[r.Intn(120)]
}
// Returns a permute4 + guard used in eg NPathIn
func Permute4G(r *rand.Rand) *[5]Direction {
return &Perm4G[r.Intn(24)]
}
// Draw from the arrays with rand.Intn(24) for a random permutation of directions.
func Permute4(r *rand.Rand) *[4]Direction {
return &Perm4[r.Intn(24)]
}
// randVector generates a random vector whose components are each in the range
// [-1, 1). The dimensionality of the vector is len(c).
func randVector(c []float64, rnd *rand.Rand) {
for i := range c {
c[i] = 2*rnd.Float64() - 1
}
}
func (*nextProtoMsg) Generate(rand *rand.Rand, size int) reflect.Value {
m := &nextProtoMsg{}
m.proto = randomString(rand.Intn(255), rand)
return reflect.ValueOf(m)
}
func (*clientKeyExchangeMsg) Generate(rand *rand.Rand, size int) reflect.Value {
m := &clientKeyExchangeMsg{}
m.ciphertext = randomBytes(rand.Intn(1000)+1, rand)
return reflect.ValueOf(m)
}
func (p Player) performance(r *rand.Rand) float64 {
dev := (r.Float64()*2.0 - 1.0)
dev = math.Fabs(dev) * dev * p.dev
return p.mean + dev
}
func (*certificateVerifyMsg) Generate(rand *rand.Rand, size int) reflect.Value {
m := &certificateVerifyMsg{}
m.signature = randomBytes(rand.Intn(15)+1, rand)
return reflect.ValueOf(m)
}
// randInt64 returns a random integer taking half the range of an int64.
func randInt64(rand *rand.Rand) int64 { return rand.Int63() - 1<<62 }