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截取20个字节的数字分割方法

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Daisy 2023-08-09 09:35:10 +08:00
parent 9d2b5d9be3
commit 142893cd47
1 changed files with 123 additions and 83 deletions
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84
star_lock/lib/blue/io_tool/io_tool.dart
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@ -17,14 +17,32 @@ String uint8ToHex(Uint8List byteArr) {
return "";
}
Uint8List result = Uint8List(byteArr.length << 1);
var hexTable = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F']; //16进制字符表
var hexTable = [
'0',
'1',
'2',
'3',
'4',
'5',
'6',
'7',
'8',
'9',
'A',
'B',
'C',
'D',
'E',
'F'
]; //16进制字符表
for (var i = 0; i < byteArr.length; i++) {
var bit = byteArr[i]; //取传入的byteArr的每一位
var index = bit >> 4 & 15; //右移4位,取剩下四位
var i2 = i << 1; //byteArr的每一位对应结果的两位,所以对于结果的操作位数要乘2
result[i2] = hexTable[index].codeUnitAt(0); //左边的值取字符表,转为Unicode放进resut数组
index = bit & 15; //取右边四位
result[i2 + 1] = hexTable[index].codeUnitAt(0); //右边的值取字符表,转为Unicode放进resut数组
result[i2 + 1] =
hexTable[index].codeUnitAt(0); //右边的值取字符表,转为Unicode放进resut数组
}
return String.fromCharCodes(result); //Unicode转回为对应字符,生成字符串返回
}
@ -48,6 +66,7 @@ int _byteInt16(List<int> dataDetail, int index){
int value = (dataDetail[index + 1] & 0xff) << 8 | (dataDetail[index] & 0xff);
return _toInt16(value);
}
int _toInt16(int value) {
var buffer = Int16List(1).buffer;
var bData = ByteData.view(buffer);
@ -61,12 +80,13 @@ int _byteInt32(List<int> dataDetail, int index){
if (checkListIndex(dataDetail, index, 4)) {
return 0;
}
int value = ((0xFF &
dataDetail[(index + 3)]) << 24 | (0xFF &
dataDetail[index + 2]) << 16 | (0xFF & dataDetail[index + 1]) << 8 | 0xFF &
dataDetail[index]);
int value = ((0xFF & dataDetail[(index + 3)]) << 24 |
(0xFF & dataDetail[index + 2]) << 16 |
(0xFF & dataDetail[index + 1]) << 8 |
0xFF & dataDetail[index]);
return _toInt32(value);
}
int _toInt32(int value) {
var buffer = Int32List(2).buffer;
var bData = ByteData.view(buffer);
@ -80,7 +100,8 @@ List<int> intToInt8List(int value) =>[value];
List<int> intToByte2ListHigh(int value) => [value, value >> 8];
//TODO:int->4个字节List 低字节在前，高字节在后(大端存储) 1byte = 8bit
List<int> intToByte4ListHigh(int value) => [value, value >> 8, value >> 16, value >> 24];
List<int> intToByte4ListHigh(int value) =>
[value, value >> 8, value >> 16, value >> 24];
int byteUInt8(List<int> dataDetail, int index) => _toUInt8(dataDetail[index]);
int _toUInt8(int value) {
@ -90,7 +111,8 @@ int _toUInt8(int value){
return bData.getUint8(0);
}
int byteUInt16(List<int> dataDetail, int index)=>_byteUInt16(dataDetail, index);
int byteUInt16(List<int> dataDetail, int index) =>
_byteUInt16(dataDetail, index);
_byteUInt16(List<int> dataDetail, int index) {
if (checkListIndex(dataDetail, index, 2)) {
return 0;
@ -98,6 +120,7 @@ _byteUInt16(List<int> dataDetail, int index){
int value = (dataDetail[index + 1]) << 8 | dataDetail[index];
return _toUInt16(value);
}
int _toUInt16(int value) {
var buffer = Uint16List(2).buffer;
var bData = ByteData.view(buffer);
@ -105,17 +128,17 @@ int _toUInt16(int value){
return bData.getUint16(0);
}
int byteUInt32(List<int> dataDetail, int index)=>_byteUInt32(dataDetail, index);
int byteUInt32(List<int> dataDetail, int index) =>
_byteUInt32(dataDetail, index);
int _byteUInt32(List<int> dataDetail, int index) {
if (checkListIndex(dataDetail, index, 4)) {
return 0;
}
int value = ((0xFF &
dataDetail[(index + 3)]) << 24 | (0xFF &
dataDetail[index + 2]) << 16 | (0xFF & dataDetail[index + 1]) << 8 | 0xFF &
dataDetail[index]);
int value = ((0xFF & dataDetail[(index + 3)]) << 24 |
(0xFF & dataDetail[index + 2]) << 16 |
(0xFF & dataDetail[index + 1]) << 8 |
0xFF & dataDetail[index]);
return _toUInt32(value);
}
@ -134,8 +157,7 @@ bool checkListIndex(List<int> dataDetail, int index, int offsetLength){
}
var len = dataDetail.length;
bool result = index + offsetLength > len;
if(result){
}
if (result) {}
return result;
}
@ -152,6 +174,28 @@ Future<List<int>> loadAssetsFile(String assetsPath) async{
return byteData.buffer.asUint8List().toList();
}
//获取截取后的数组
List<List<T>> splitList<T>(List<T> list, int len) {
if (len <= 1) {
return [list];
}
List<List<T>> result = [];
int index = 1;
while (true) {
if (index * len < list.length) {
List<T> temp = list.skip((index - 1) * len).take(len).toList();
result.add(temp);
index++;
continue;
}
List<T> temp = list.skip((index - 1) * len).toList();
result.add(temp);
break;
}
return result;
}
//TODO:获取数据包分包后包的数量
int getPackageCount(List<int> data, {required int averageLen}) {
@ -159,11 +203,8 @@ int getPackageCount(List<int> data,{required int averageLen}){
return len % averageLen > 0 ? (len ~/ averageLen + 1) : len ~/ averageLen;
}
List<int> getSubData({
required int index,
required int average,
required List<int> data
}){
List<int> getSubData(
{required int index, required int average, required List<int> data}) {
if (data.isEmpty) {
return [];
}
@ -205,7 +246,6 @@ List<int> reverseList(List<int> srcData){
//TODO:int->两个字节 List 高字节在前，低字节在后(小端存储) 本工程只有配置 WiFi用到的!!!!
List<int> intToByte2ListLow(int value) => [value >> 8, value];
int dealWeekDays({
required int mon,
required int tue,