import 'dart:math';
|
|
class NumberUtils {
|
///二进制数组转字节数组
|
static List<int> intListFromBits(List<int> bits) {
|
//print("${bits.toString()} ${bits.length ~/ 8}");
|
List<int> result = List.generate(bits.length >> 3, (index) => 0);
|
for (int i = 0; i < bits.length; i++) {
|
result[i >> 3] |= (bits[i] << (7 - i & 7));
|
}
|
return result;
|
}
|
|
///字节数组转二进制数组
|
static List<int> bitsFromIntList(List<int> ints) {
|
List<int> result = List.filled(ints.length << 3,0);
|
for (int i = 0; i < (ints.length << 3); ++i) {
|
result[i] = (ints[i >> 3] >> (7 - i & 7)) & 1;
|
}
|
return result;
|
// List<int> result = [];
|
// ints.forEach((i) {
|
// result.addAll(to8Bit(i));
|
// });
|
// return result;
|
}
|
|
///二进制字符串转数字
|
static int intFromBits(List<int> bits) {
|
//return int.parse(bits.join(), radix: 2);
|
int result = 0;
|
for (int i = 0; i < bits.length; i++) {
|
result |= (bits[i] << (7 - i & 7));
|
}
|
return result;
|
}
|
|
///to8Bit 01100100
|
static List<int> t8Bit(List<int> bytes) {
|
List<int> result = List.filled(8 * bytes.length,0);
|
for (int i = 0; i < 8 * bytes.length; ++i) {
|
result[i] = (bytes[i >> 3] >> (7 - i & 7)) & 1;
|
}
|
return result;
|
}
|
|
/// 4 -> 00000100
|
static List<int> to8Bit(int num) {
|
List<int> result = List.filled(8,0);
|
for (int i = 0; i < 8; i++) {
|
result[i] = (num >> (7 - i & 7)) & 1;
|
}
|
return result;
|
|
String temp = num.toRadixString(2);
|
int zeroLen = 8 - temp.length;
|
for (int i = 0; i < 8; i++) {
|
if (i < zeroLen) {
|
result[i] = 0;
|
} else {
|
result[i] = (temp.codeUnitAt(i - zeroLen) - 48);
|
}
|
}
|
return result;
|
}
|
|
/// 4 -> 0100
|
static List<int> to4Bit(int num) {
|
List<int> result = List.filled(4,0);
|
for (int i = 0; i < 4; i++) {
|
result[i] = (num >> (3 - i & 3)) & 1;
|
}
|
return result;
|
|
String temp = num.toRadixString(2);
|
temp.codeUnits.forEach((code) {
|
result.add(code - 48);
|
});
|
int len = result.length;
|
if (len < 4) {
|
result.insertAll(0, List.generate(4, (index) => 0).sublist(len));
|
}
|
return result;
|
}
|
|
static String formatSeeds(int seeds) {
|
if (seeds > 9999) {
|
return '${(seeds / 10000.0).toStringAsFixed(1)}w';
|
} else if (seeds > 999) {
|
return '${(seeds / 1000.0).toStringAsFixed(1)}k';
|
} else {
|
return '$seeds';
|
}
|
}
|
}
|
