/// <summary>
/// 对文本和图片数据进行加密;如果长度超过限制，直接抛给文件处理中心
/// </summary>
/// <param name="stateCode">StateCode</param>
/// <param name="state">StateBase</param>
/// <returns>要发送的数据</returns>
internal static byte[] encryption(StateCode stateCode, StateBase state)
{
byte[] returnByte = null;
if (stateCode.State == PasswordCode._textCode)
{
byte textCode = PasswordCode._textCode;
byte[] date = Encoding.UTF8.GetBytes(stateCode.Datestring);
returnByte = encryptionTemporary(date, textCode, state);
}
else if (stateCode.State == PasswordCode._photographCode)
{
byte photographCode = stateCode.State;
returnByte = encryptionTemporary(stateCode.DateByte, photographCode, state);
}
return(returnByte);
}
/// <summary>
/// 一个分配函数;返回是NULL说明不是本系统的数据；违法数据等等
/// </summary>
/// <param name="date">数据</param>
/// <returns>StateCode</returns>
internal static StateCode Distribution(byte[] date)
{
StateCode statecode = null;
if (date.Length < 2)
{
return(statecode);
}
byte headcode = date[0];
if (headcode == PasswordCode._fileCode || headcode == PasswordCode._bigDateCode || headcode == PasswordCode._commonCode || headcode == PasswordCode._verificationCode)
{
statecode = new StateCode(headcode, date);
}
return(statecode);
}
/// <summary>
/// 对文本和图片数据进行解密;
/// </summary>
/// <param name="date">接收到的数据</param>
/// <param name="state">StateBase</param>
/// <returns>StateCode</returns>
internal static StateCode deciphering(byte[] date, StateBase state)
{
StateCode stateCode = null;
if (date.Length < 6)
{
return(stateCode);//收到的数据不正确
}
byte headDate = date[1];
if (headDate == PasswordCode._textCode || headDate == PasswordCode._photographCode)//解密到的是文本数据
{
int SendDateLabel = 0;
byte[] dateAll = ByteToDate.OffsetDecrypt(date, out SendDateLabel, 2);
byte[] ReplyDate = ByteToDate.CombinationTwo(PasswordCode._commonCode, PasswordCode._dateSuccess, SendDateLabel);//直接回复发送成功
if (headDate == PasswordCode._textCode)
{
string str = Encoding.UTF8.GetString(dateAll);
stateCode = new StateCode(PasswordCode._textCode, str, ReplyDate); //解析出来是文本数据
}
else
{
stateCode = new StateCode(PasswordCode._photographCode, dateAll, ReplyDate); //解释出来是图片数据
}
}
else if (headDate == PasswordCode._dateSuccess) //数据成功或重发
{
int SendDateLabel = ByteToDate.ByteToInt(2, date); //找出已发数据的标签
if (headDate == PasswordCode._dateSuccess)
{
stateCode = new StateCode(headDate);
if (SendDateLabel == state.SendDateLabel)
{
state.SendDate = null;
} //已经成功对已发数据进行删除
}
}
return(stateCode);
}
/// <summary>
/// 当收到是分组数据代码的到这里来统一处理
/// </summary>
/// <param name="date">数据</param>
/// <param name="state">StateBase</param>
/// <returns>StateCode</returns>
internal static StateCode FileDecrypt(byte[] date, StateBase state)
{
StateCode stateCode = null;
if (date.Length < 6)
{
return(stateCode);
}
byte headDate = date[1];
if (headDate == PasswordCode._fileAgreeReceive)
{//对方同意接收文件;我应该怎么处理
int FileLabel = ByteToDate.ByteToInt(2, date);
if (state.SendFile != null && state.SendFile.FileLabel == FileLabel)
{
byte[] SendSubjectDate = FileGetSendDate(state);
if (SendSubjectDate == null)
{
stateCode = new StateCode(PasswordCode._dateSuccess);
}
else
{
stateCode = new StateCode(SendSubjectDate);//直接发送
}
}
}
else if (headDate == PasswordCode._dateSuccess)
{//对方已经接收到数据
int FileLabel = ByteToDate.ByteToInt(2, date);
if (state.SendFile != null && state.SendFile.FileLabel == FileLabel)
{
byte[] SendSubjectDate = FileGetSendDate(state);
if (SendSubjectDate == null)
{
stateCode = new StateCode(PasswordCode._dateSuccess);
}
else
{
stateCode = new StateCode(SendSubjectDate);//直接发送
}
}
}
//上面是发送方接收要做的;下面是接收方发送要做的事情
else if (headDate == PasswordCode._fileHeadCode)
{//收到的是文件包头部分
byte whatCode = date[2];
int fileLabel = ByteToDate.ByteToInt(3, date);
int fileLenth = ByteToDate.ByteToInt(7, date);
state.ReceiveFile = new FileBase(whatCode, fileLabel, fileLenth);
byte[] dateAll = new byte[6];
dateAll[0] = PasswordCode._bigDateCode;
dateAll[1] = PasswordCode._fileAgreeReceive;
ByteToDate.IntToByte(fileLabel, 2, dateAll);
stateCode = new StateCode(dateAll);
}
else if (headDate == PasswordCode._fileSubjectCode)
{//收到的是文件主体部分
int SendDateLabel = 0;
byte[] dateAll = ByteToDate.OffsetDecrypt(date, out SendDateLabel, 2);
byte[] ReplyDate = ByteToDate.CombinationTwo(PasswordCode._bigDateCode, PasswordCode._dateSuccess, state.ReceiveFile.FileLabel);
if (state.ReceiveFile.FileDateAll == null)
{
state.ReceiveFile.FileDateAll = dateAll;//是第一次接收到主体数据
stateCode = new StateCode(ReplyDate);
}
else
{
byte[] FileDateAll = new byte[state.ReceiveFile.FileDateAll.Length + dateAll.Length];
state.ReceiveFile.FileDateAll.CopyTo(FileDateAll, 0);
dateAll.CopyTo(FileDateAll, state.ReceiveFile.FileDateAll.Length);
state.ReceiveFile.FileDateAll = FileDateAll;
if (FileDateAll.Length == state.ReceiveFile.FileLenth)
{
if (state.ReceiveFile.FileClassification == PasswordCode._textCode)
{
string str = Encoding.UTF8.GetString(FileDateAll);
stateCode = new StateCode(PasswordCode._textCode, str, ReplyDate);
}
else
{
stateCode = new StateCode(PasswordCode._photographCode, FileDateAll, ReplyDate);
}
state.ReceiveFile = null;//文件接收完成；释放接收器
}
else
{
stateCode = new StateCode(ReplyDate);
}
}
}
return(stateCode);
}