截取20个字节的数字分割方法
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Daisy
parent
9d2b5d9be3
commit
142893cd47
@ -17,38 +17,57 @@ String uint8ToHex(Uint8List byteArr) {
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return "";
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}
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Uint8List result = Uint8List(byteArr.length << 1);
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var hexTable = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F']; //16进制字符表
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var hexTable = [
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'0',
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'1',
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'2',
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'3',
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'4',
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'5',
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'6',
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'7',
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'8',
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'9',
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'A',
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'B',
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'C',
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'D',
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'E',
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'F'
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]; //16进制字符表
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for (var i = 0; i < byteArr.length; i++) {
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var bit = byteArr[i]; //取传入的byteArr的每一位
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var index = bit >> 4 & 15; //右移4位,取剩下四位
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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
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result[i2] = hexTable[index].codeUnitAt(0); //左边的值取字符表,转为Unicode放进resut数组
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index = bit & 15; //取右边四位
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result[i2 + 1] = hexTable[index].codeUnitAt(0); //右边的值取字符表,转为Unicode放进resut数组
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result[i2 + 1] =
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hexTable[index].codeUnitAt(0); //右边的值取字符表,转为Unicode放进resut数组
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}
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return String.fromCharCodes(result); //Unicode转回为对应字符,生成字符串返回
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}
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//TODO:int->两个字节 List 低字节在前，高字节在后(大端存储)=>嵌入式小端接收(协议用到)
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int byteInt8(List<int> dataDetail, int index)=>_toInt8(dataDetail[index]);
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int _toInt8(int value){
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int byteInt8(List<int> dataDetail, int index) => _toInt8(dataDetail[index]);
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int _toInt8(int value) {
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var buffer = Int8List(4).buffer;
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var bData = ByteData.view(buffer);
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bData.setInt8(0, value);
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return bData.getInt8(0);
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}
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int byteInt16(List<int> dataDetail, int index)=>_byteInt16(dataDetail, index);
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int _byteInt16(List<int> dataDetail, int index){
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if(checkListIndex(dataDetail, index, 2)){
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int byteInt16(List<int> dataDetail, int index) => _byteInt16(dataDetail, index);
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int _byteInt16(List<int> dataDetail, int index) {
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if (checkListIndex(dataDetail, index, 2)) {
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return 0;
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}
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int value = (dataDetail[index +1] & 0xff) << 8 | (dataDetail[index] & 0xff);
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int value = (dataDetail[index + 1] & 0xff) << 8 | (dataDetail[index] & 0xff);
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return _toInt16(value);
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}
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int _toInt16(int value){
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int _toInt16(int value) {
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var buffer = Int16List(1).buffer;
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var bData = ByteData.view(buffer);
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bData.setInt16(0, value);
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@ -56,18 +75,19 @@ int _toInt16(int value){
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return outputValue;
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}
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int byteInt32(List<int> dataDetail, int index)=>_byteInt32(dataDetail, index);
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int _byteInt32(List<int> dataDetail, int index){
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if(checkListIndex(dataDetail, index, 4)){
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int byteInt32(List<int> dataDetail, int index) => _byteInt32(dataDetail, index);
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int _byteInt32(List<int> dataDetail, int index) {
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if (checkListIndex(dataDetail, index, 4)) {
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return 0;
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}
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int value = ((0xFF &
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dataDetail[(index + 3)]) << 24 | (0xFF &
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dataDetail[index + 2]) << 16 | (0xFF & dataDetail[index + 1]) << 8 | 0xFF &
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dataDetail[index]);
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int value = ((0xFF & dataDetail[(index + 3)]) << 24 |
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(0xFF & dataDetail[index + 2]) << 16 |
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(0xFF & dataDetail[index + 1]) << 8 |
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0xFF & dataDetail[index]);
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return _toInt32(value);
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}
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int _toInt32(int value){
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int _toInt32(int value) {
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var buffer = Int32List(2).buffer;
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var bData = ByteData.view(buffer);
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bData.setInt32(0, value);
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@ -75,51 +95,54 @@ int _toInt32(int value){
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return outputValue;
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}
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List<int> intToInt8List(int value) =>[value];
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List<int> intToInt8List(int value) => [value];
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List<int> intToByte2ListHigh(int value) => [value,value >> 8];
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List<int> intToByte2ListHigh(int value) => [value, value >> 8];
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//TODO:int->4个字节List 低字节在前，高字节在后(大端存储) 1byte = 8bit
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List<int> intToByte4ListHigh(int value) => [value, value >> 8, value >> 16, value >> 24];
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List<int> intToByte4ListHigh(int value) =>
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[value, value >> 8, value >> 16, value >> 24];
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int byteUInt8(List<int> dataDetail, int index)=>_toUInt8(dataDetail[index]);
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int _toUInt8(int value){
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int byteUInt8(List<int> dataDetail, int index) => _toUInt8(dataDetail[index]);
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int _toUInt8(int value) {
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var buffer = Int8List(1).buffer;
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var bData = ByteData.view(buffer);
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bData.setInt8(0, value);
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return bData.getUint8(0);
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}
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int byteUInt16(List<int> dataDetail, int index)=>_byteUInt16(dataDetail, index);
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_byteUInt16(List<int> dataDetail, int index){
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if(checkListIndex(dataDetail, index, 2)){
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int byteUInt16(List<int> dataDetail, int index) =>
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_byteUInt16(dataDetail, index);
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_byteUInt16(List<int> dataDetail, int index) {
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if (checkListIndex(dataDetail, index, 2)) {
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return 0;
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}
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int value = (dataDetail[index + 1]) << 8 | dataDetail[index];
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return _toUInt16(value);
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}
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int _toUInt16(int value){
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int _toUInt16(int value) {
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var buffer = Uint16List(2).buffer;
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var bData = ByteData.view(buffer);
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bData.setInt16(0, value);
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return bData.getUint16(0);
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}
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int byteUInt32(List<int> dataDetail, int index) =>
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_byteUInt32(dataDetail, index);
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int byteUInt32(List<int> dataDetail, int index)=>_byteUInt32(dataDetail, index);
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int _byteUInt32(List<int> dataDetail, int index){
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if(checkListIndex(dataDetail, index, 4)){
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int _byteUInt32(List<int> dataDetail, int index) {
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if (checkListIndex(dataDetail, index, 4)) {
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return 0;
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}
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int value = ((0xFF &
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dataDetail[(index + 3)]) << 24 | (0xFF &
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dataDetail[index + 2]) << 16 | (0xFF & dataDetail[index + 1]) << 8 | 0xFF &
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dataDetail[index]);
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int value = ((0xFF & dataDetail[(index + 3)]) << 24 |
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(0xFF & dataDetail[index + 2]) << 16 |
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(0xFF & dataDetail[index + 1]) << 8 |
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0xFF & dataDetail[index]);
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return _toUInt32(value);
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}
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int _toUInt32(int value){
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int _toUInt32(int value) {
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var buffer = Int32List(2).buffer;
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var bData = ByteData.view(buffer);
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bData.setInt32(0, value);
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@ -127,84 +150,101 @@ int _toUInt32(int value){
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return outputValue;
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}
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bool checkListIndex(List<int> dataDetail, int index, int offsetLength){
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if(dataDetail == null){
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bool checkListIndex(List<int> dataDetail, int index, int offsetLength) {
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if (dataDetail == null) {
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print('❌解析 dataDetail == null');
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return true;
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}
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var len = dataDetail.length;
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bool result = index + offsetLength > len;
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if(result){
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}
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if (result) {}
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return result;
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}
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int checkSum(List<int> data) {
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int checkSum(List<int> data) {
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int sum = 0;
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for(int v in data){
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for (int v in data) {
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sum ^= v;
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}
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return sum;
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}
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Future<List<int>> loadAssetsFile(String assetsPath) async{
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var byteData = await rootBundle.load(assetsPath);
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Future<List<int>> loadAssetsFile(String assetsPath) async {
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var byteData = await rootBundle.load(assetsPath);
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return byteData.buffer.asUint8List().toList();
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}
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//获取截取后的数组
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List<List<T>> splitList<T>(List<T> list, int len) {
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if (len <= 1) {
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return [list];
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}
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//TODO:获取数据包分包后包的数量
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int getPackageCount(List<int> data,{required int averageLen}){
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int len = data.length;
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return len%averageLen > 0 ? (len~/averageLen + 1) : len~/averageLen;
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List<List<T>> result = [];
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int index = 1;
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while (true) {
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if (index * len < list.length) {
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List<T> temp = list.skip((index - 1) * len).take(len).toList();
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result.add(temp);
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index++;
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continue;
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}
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List<T> temp = list.skip((index - 1) * len).toList();
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result.add(temp);
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break;
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}
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return result;
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}
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List<int> getSubData({
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required int index,
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required int average,
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required List<int> data
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}){
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if(data.isEmpty){
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//TODO:获取数据包分包后包的数量
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int getPackageCount(List<int> data, {required int averageLen}) {
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int len = data.length;
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return len % averageLen > 0 ? (len ~/ averageLen + 1) : len ~/ averageLen;
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}
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List<int> getSubData(
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{required int index, required int average, required List<int> data}) {
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if (data.isEmpty) {
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return [];
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}
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int totalLength = data.length;
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if(average >= totalLength){
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if (average >= totalLength) {
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return data;
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}
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if(index*average > totalLength){
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if((index - 1)*average > totalLength){
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if (index * average > totalLength) {
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if ((index - 1) * average > totalLength) {
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return [];
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}else{
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int tempCount = average*(index - 1);
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return data.sublist(tempCount,totalLength);
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} else {
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int tempCount = average * (index - 1);
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return data.sublist(tempCount, totalLength);
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}
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}else{
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return data.sublist(average*(index - 1),average*index);
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} else {
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return data.sublist(average * (index - 1), average * index);
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}
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}
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List<int> reverseList(List<int> srcData){
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List<int> reverseList(List<int> srcData) {
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print('srcData:$srcData'); //[1,3]
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int srcLen = srcData.length;
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int halfLen = srcLen ~/2;
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int halfLen = srcLen ~/ 2;
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List<int> dstData = [];
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dstData.addAll(srcData);
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for(int i =0; i < halfLen; i++){
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for (int i = 0; i < halfLen; i++) {
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int begin = i;
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int end = srcLen-i-1;
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List<int> beginData = srcData.sublist(begin,begin+1);
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List<int> endData = srcData.sublist(end,end + 1);
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dstData.replaceRange(begin, begin+1, endData);
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dstData.replaceRange(end, end+1, beginData);
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int end = srcLen - i - 1;
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List<int> beginData = srcData.sublist(begin, begin + 1);
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List<int> endData = srcData.sublist(end, end + 1);
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dstData.replaceRange(begin, begin + 1, endData);
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dstData.replaceRange(end, end + 1, beginData);
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}
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print('dstData:$dstData');
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return dstData;
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}
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//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!!!!
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List<int> intToByte2ListLow(int value) =>[value >> 8,value];
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List<int> intToByte2ListLow(int value) => [value >> 8, value];
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int dealWeekDays({
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required int mon,
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@ -214,37 +254,37 @@ int dealWeekDays({
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required int fri,
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required int sat,
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required int sun,
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}){
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}) {
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return mon + tue * 2 + wed * 4 + thu * 8 + fri * 16 + sat * 32 + sun * 64;
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}
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String radixString(List<int> codeUnits){
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String radixString(List<int> codeUnits) {
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String result = '';
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codeUnits.forEach((value){
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result += value.toRadixString(16).padLeft(2,'0');
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codeUnits.forEach((value) {
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result += value.toRadixString(16).padLeft(2, '0');
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});
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return result;
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}
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String asciiString(List<int> codeUnits){
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String asciiString(List<int> codeUnits) {
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String result = '';
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codeUnits.forEach((value){
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codeUnits.forEach((value) {
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result += String.fromCharCode(value);
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});
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return result;
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}
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String utf8String(List<int> codeUnits){
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String utf8String(List<int> codeUnits) {
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return utf8.decode(codeUnits);
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}
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bool compareTwoList({List<int>? list1,List<int>? list2}) {
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if(list1!.length != list2!.length)return false;
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bool compareTwoList({List<int>? list1, List<int>? list2}) {
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if (list1!.length != list2!.length) return false;
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int ctn = list1.length;
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for(int i = 0; i < ctn;i++){
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for (int i = 0; i < ctn; i++) {
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int v1 = list1[i];
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int v2 = list2[i];
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if(v1 != v2){
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if (v1 != v2) {
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print('不包含 $i');
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return false;
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}
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@ -252,4 +292,4 @@ bool compareTwoList({List<int>? list1,List<int>? list2}) {
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return true;
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}
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List<int> encodeStringToInt(String input)=>utf8.encode(input);
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List<int> encodeStringToInt(String input) => utf8.encode(input);
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