/// <summary>
/// 从文件中获取数据包，并将其保存在list中
/// </summary>
/// 4G集中器一包512个字节，2G集中器一包1024个字节
public static void GetDataPack(int FileSize, string romPath)
{
//清空缓存数据包列表
Frm_Main.DataPacks.Clear();
//新建缓存buffer
byte[] buffer = new byte[FileSize];
//打开文件
System.IO.FileStream file = new System.IO.FileStream(romPath, FileMode.Open, FileAccess.Read); //句柄
//循环读取文件
while (true)
{
//加锁
lock (buffer)
{
//情况缓存buffer
Array.Clear(buffer, 0, FileSize);
//异步读取文件
Task <int> r = file.ReadAsync(buffer, 0, FileSize);
//返回结果为零则表示读取完了
if (r.Result == 0)
{
file.Close();
return;
}
//将读取到的buffer封包
Dstruct bufStruct = (Dstruct)UpdateHelper.BytesToStruct(buffer, typeof(Dstruct));
//添加到缓存列表中
DataPacks.Add(bufStruct);
}
}
}
/// <summary>
/// 获取固件包
/// </summary>
/// <param name="reportBuffer">串口上报的数据，用于解析请求的index</param>
/// <returns></returns>
public static byte[] getFirmwarePag(byte[] reportBuffer)
{
try
{
//转读固件包结构
ReadUpdateP readPag = (ReadUpdateP)BytesToStruct(reportBuffer, typeof(ReadUpdateP));
//获取Index
int index = readPag.index;
//Index 赋值
Frm_Main.packetIndex = index + 1;
//取升级固件包
Dstruct dataSt = Frm_Main.DataPacks[index];
byte[] data = StructToBytes(dataSt);
//升级包数据域
Updatestruct upStruct = new Updatestruct();
//创建包头
StructHeader header = new StructHeader();
// 添加包头
header.HEAD = GSMCMDEnum.frameHead;
//通信地址
byte[] comAddr = { 0xAA, 0xAA, 0xAA, 0xAA, 0xAA };
header.COMADDR = comAddr;
//源类型
header.SRC = 0xE1;
//目标类型
header.DEST = 0xA1;
//命令码
header.CMD = GSMCMDEnum.ackFirmware;
//帧长度
header.LEN = 14 + 256 + 2 + 3;
//转换大小端
header.LEN = BytesArrayHelper.SwapUInt16(header.LEN);
//升级包编号
upStruct.index = (byte)index;
//固件总长度
UInt16 fileLength = (UInt16)Frm_Main.fileLenth;
//转换大端
fileLength = BytesArrayHelper.SwapUInt16(fileLength);
//设置总长度
upStruct.fileLength = fileLength;
//升级包
upStruct.dPack = data;
//数据域
byte[] dataBytes = new byte[259];
//赋值固件包数据
dataBytes = StructToBytes(upStruct);
//转换包头
byte[] headerBytes = StructToBytes(header);
//创建总包bytes
byte[] sendBytes = new byte[headerBytes.Length + dataBytes.Length + 2 + 3];
//拷贝Header
Array.Copy(headerBytes, 0, sendBytes, 0, headerBytes.Length);
//拷贝xxTea
Array.Copy(dataBytes, 0, sendBytes, headerBytes.Length, dataBytes.Length);
//crc
UInt16 crc = Crc16.GetCRC16(sendBytes, sendBytes.Length - 5);
// 创建2字节byte数组用于存放校验位
byte[] Check_Arr = new byte[2];
// 获取校验位高8位
Check_Arr[1] = Convert.ToByte(crc >> 8);
// 获取校验位低8位
Check_Arr[0] = Convert.ToByte(crc & 0xFF);
//拷贝crc
Array.Copy(Check_Arr, 0, sendBytes, sendBytes.Length - 5, 2);
//包尾
sendBytes[sendBytes.Length - 3] = 0x2d;
sendBytes[sendBytes.Length - 2] = 0x2d;
sendBytes[sendBytes.Length - 1] = 0x45;
//返回数据
return(sendBytes);
}
catch (Exception)
{
//若发送报错则关闭套接字
return(null);
}
}
