/// <summary>
/// 对包头文件进行解密
/// </summary>
/// <param name="fileDate"></param>
/// <param name="fs"></param>
/// <returns></returns>
internal static FileState FileHeadDecrypt(byte[] fileDate, FileStream fs)
{
int lable = ByteToDate.ByteToInt(3, fileDate);
long fileLenth = ByteToDate.ByteToLong(7, fileDate);
byte[] fileNameByte = new byte[fileDate.Length - 15];
Array.Copy(fileDate, 15, fileNameByte, 0, fileNameByte.Length);
string fileName = Encoding.UTF8.GetString(fileNameByte);
FileState haveState = new FileState(lable, fileLenth, fileName, fs);
return(haveState);
}
/// <summary>
/// 接收方发过来的数据；
/// </summary>
/// <param name="receiveToDate">收到的数据</param>
/// <param name="stateOne">StateBase</param>
/// <returns>回复的数据</returns>
internal byte[] ReceiveDateTO(byte[] receiveToDate, StateBase stateOne)
{
byte[] haveDate = null;
int fileLabel = ByteToDate.ByteToInt(3, receiveToDate);
byte code = receiveToDate[2];
FileState state = FileLabelToState(fileLabel);
if (state == null)
{
if (code == PasswordCode._fileCancel)
{
return(null);
}
else
{
return(EncryptionDecryptFile.FileSevenEncryption(PasswordCode._sendUser, PasswordCode._fileCancel, fileLabel));
}
}
else
{
switch (code)
{
case PasswordCode._fileOk: //对方同意接收文件
Thread.Sleep(500);
state.StateFile = 1;
haveDate = EncryptionDecryptFile.FileSubjectEncryption(state, stateOne.BufferSize);
SendMust.FileStartOn(fileLabel); //第一次发送用原来尺寸
break;
case PasswordCode._fileRefuse: //对方拒绝接收文件
FileRemove(fileLabel);
SendMust.FileRefuse(fileLabel);
break;
case PasswordCode._dateSuccess: //主体部分数据发送成功；准备发送下一批
haveDate = EncryptionDecryptFile.FileSubjectEncryption(state, BufferSize);
SendMust.FileProgress(state);
if (haveDate == null)//说明这个文件已经发送成功了
{
FileRemove(fileLabel); SendMust.SendSuccess(fileLabel);
}
break;
case PasswordCode._fileCancel: //对方已经取消了这个文件；
FileRemove(fileLabel);
SendMust.FileCancel(fileLabel);
break;
case PasswordCode._sendStop: //对方暂停发送
FileStopIn(state, SendMust);
break;
case PasswordCode._fileContinue: //对方发过来一个续传的确认信息;你是否同意；
state.StateOne = stateOne; //有可能stateOne会有变化
FileStopIn(state, SendMust); //对方已经暂停了这个文件；我这边肯定也要先暂停掉
bool orStop = SendMust.FileOrNotContingue(fileLabel); //让客户确认；是否续传
if (orStop)
{
state.StateFile = 1;
state.FileOkLenth = ByteToDate.ByteToLong(7, receiveToDate);
state.Filestream.Position = state.FileOkLenth; //设置流的当前读位置
haveDate = EncryptionDecryptFile.FileSubjectEncryption(state, stateOne.BufferSize);
if (haveDate != null)
{
haveDate[2] = PasswordCode._fileContinueOk;
SendMust.FileContinue(fileLabel);
}
}
else
{
haveDate = EncryptionDecryptFile.FileSevenEncryption(PasswordCode._sendUser, PasswordCode._fileContinueNo, fileLabel);
}
break;
case PasswordCode._fileContinueOk: //对方同意续传
state.FileOkLenth = ByteToDate.ByteToLong(7, receiveToDate);
state.StateFile = 1;
state.Filestream.Position = state.FileOkLenth; //设置流的当前读位置
haveDate = EncryptionDecryptFile.FileSubjectEncryption(state, stateOne.BufferSize);
SendMust.FileContinue(fileLabel);
break;
case PasswordCode._fileContinueNo: //对方拒绝续传
SendMust.FileNoContinue(fileLabel);
FileStopIn(state, SendMust);
break;
}
}
return(haveDate);
}
