public static EInteger RandomEInteger(RandomGenerator r)
{
if (r == null)
{
throw new ArgumentNullException(nameof(r));
}
int selection = r.UniformInt(100);
if (selection < 40)
{
StringAndBigInt sabi = StringAndBigInt.Generate(r, 16);
return(sabi.BigIntValue);
}
if (selection < 50)
{
StringAndBigInt sabi = StringAndBigInt.Generate(
r,
2 + r.UniformInt(35));
return(sabi.BigIntValue);
}
else
{
int count = r.UniformInt(60) + 1;
var bytes = new byte[count];
for (var i = 0; i < count; ++i)
{
bytes[i] = (byte)((int)r.UniformInt(256));
}
return(EInteger.FromBytes(bytes, true));
}
}
public static StringAndBigInt Generate(
RandomGenerator rand,
int radix,
int maxNumDigits)
{
if (radix < 2)
{
throw new ArgumentException("radix(" + radix +
") is less than 2");
}
if (radix > 36)
{
throw new ArgumentException("radix(" + radix +
") is more than 36");
}
EInteger bv = EInteger.Zero;
var sabi = new StringAndBigInt();
int numDigits = 1 + rand.UniformInt(maxNumDigits);
var negative = false;
var builder = new StringBuilder();
if (rand.UniformInt(2) == 0)
{
builder.Append('-');
negative = true;
}
int radixpowint = radix * radix * radix * radix;
EInteger radixpow4 = EInteger.FromInt32(radixpowint);
EInteger radixpow1 = EInteger.FromInt32(radix);
var count = 0;
for (int i = 0; i < numDigits - 4; i += 4)
{
int digitvalues = rand.UniformInt(radixpowint);
int digit = digitvalues % radix;
digitvalues /= radix;
int digit2 = digitvalues % radix;
digitvalues /= radix;
int digit3 = digitvalues % radix;
digitvalues /= radix;
int digit4 = digitvalues % radix;
digitvalues /= radix;
count += 4;
int bits = rand.UniformInt(16);
if ((bits & 0x01) == 0)
{
builder.Append(ValueDigits[digit]);
}
else
{
builder.Append(ValueDigitsLower[digit]);
}
if ((bits & 0x02) == 0)
{
builder.Append(ValueDigits[digit2]);
}
else
{
builder.Append(ValueDigitsLower[digit2]);
}
if ((bits & 0x04) == 0)
{
builder.Append(ValueDigits[digit3]);
}
else
{
builder.Append(ValueDigitsLower[digit3]);
}
if ((bits & 0x08) == 0)
{
builder.Append(ValueDigits[digit4]);
}
else
{
builder.Append(ValueDigitsLower[digit4]);
}
int digits = (((((digit * radix) + digit2) *
radix) + digit3) * radix) + digit4;
bv *= radixpow4;
var bigintTmp = (EInteger)digits;
bv += bigintTmp;
}
for (int i = count; i < numDigits; ++i)
{
int digit = rand.UniformInt(radix);
if (rand.UniformInt(2) == 0)
{
builder.Append(ValueDigits[digit]);
}
else
{
builder.Append(ValueDigitsLower[digit]);
}
bv *= radixpow1;
var bigintTmp = (EInteger)digit;
bv += bigintTmp;
}
if (negative)
{
bv = -bv;
}
sabi.bigintValue = bv;
sabi.stringValue = builder.ToString();
return(sabi);
}
public static StringAndBigInt Generate(RandomGenerator rand, int radix) {
if (radix < 2) {
throw new ArgumentException("radix (" + radix +
") is less than 2");
}
if (radix > 36) {
throw new ArgumentException("radix (" + radix +
") is more than 36");
}
EInteger bv = EInteger.Zero;
var sabi = new StringAndBigInt();
int numDigits = 1 + rand.UniformInt(400);
var negative = false;
var builder = new StringBuilder();
if (rand.UniformInt(2) == 0) {
builder.Append('-');
negative = true;
}
int radixpowint = radix * radix * radix * radix;
EInteger radixpow4 = EInteger.FromInt32(radixpowint);
EInteger radixpow1 = EInteger.FromInt32(radix);
var count = 0;
for (int i = 0; i < numDigits - 4; i += 4) {
int digitvalues = rand.UniformInt(radixpowint);
int digit = digitvalues % radix;
digitvalues /= radix;
int digit2 = digitvalues % radix;
digitvalues /= radix;
int digit3 = digitvalues % radix;
digitvalues /= radix;
int digit4 = digitvalues % radix;
digitvalues /= radix;
count += 4;
int bits = rand.UniformInt(16);
if ((bits & 0x01) == 0) {
builder.Append(ValueDigits[digit]);
} else {
builder.Append(ValueDigitsLower[digit]);
}
if ((bits & 0x02) == 0) {
builder.Append(ValueDigits[digit2]);
} else {
builder.Append(ValueDigitsLower[digit2]);
}
if ((bits & 0x04) == 0) {
builder.Append(ValueDigits[digit3]);
} else {
builder.Append(ValueDigitsLower[digit3]);
}
if ((bits & 0x08) == 0) {
builder.Append(ValueDigits[digit4]);
} else {
builder.Append(ValueDigitsLower[digit4]);
}
int digits = (((((digit * radix) + digit2) *
radix) + digit3) * radix) + digit4;
bv *= radixpow4;
var bigintTmp = (EInteger)digits;
bv += bigintTmp;
}
for (int i = count; i < numDigits; ++i) {
int digit = rand.UniformInt(radix);
if (rand.UniformInt(2) == 0) {
builder.Append(ValueDigits[digit]);
} else {
builder.Append(ValueDigitsLower[digit]);
}
bv *= radixpow1;
var bigintTmp = (EInteger)digit;
bv += bigintTmp;
}
if (negative) {
bv = -bv;
}
sabi.bigintValue = bv;
sabi.stringValue = builder.ToString();
return sabi;
}
