/// <summary>
/// 用于接收方；对续传时回复长度的数据进行加密
/// </summary>
/// <param name="code">是同意时还是发起方</param>
/// <param name="fileState">FileState</param>
/// <returns>加密之后的数据</returns>
internal static byte[] ReceiveContingueEncryption(byte code, FileState fileState)
{
byte[] haveDate = new byte[15];
haveDate[0] = PasswordCode._fileCode;
haveDate[1] = PasswordCode._receiveUser;
haveDate[2] = code;
ByteToDate.IntToByte(fileState.FileLabel, 3, haveDate);
ByteToDate.IntToByte(fileState.FileOkLenth, 7, haveDate);
return(haveDate);
}
/// <summary>
/// 发送文件初始化；发送文件前先发一个小包让对方进行确认
/// </summary>
/// <param name="date">数据</param>
/// <param name="textCode">什么文件</param>
/// <param name="state">StateBase</param>
/// <returns>加密之后的包头</returns>
internal static byte[] SendHeadEncryption(byte[] date, byte textCode, StateBase state)
{
state.SendFile = new FileBase(date);
state.SendFile.FileLabel = RandomPublic.RandomNumber(14562);
byte[] headDate = new byte[11];
headDate[0] = PasswordCode._bigDateCode; headDate[1] = PasswordCode._fileHeadCode; headDate[2] = textCode;
ByteToDate.IntToByte(state.SendFile.FileLabel, 3, headDate);
ByteToDate.IntToByte(date.Length, 7, headDate);
return(headDate);
}
/// <summary>
/// 一个普通的对数据主体部分进行加密；
/// </summary>
/// <param name="date">要加密的数据</param>
/// <param name="textCode"></param>
/// <param name="state">StateBase</param>
/// <returns>加密之后的数据</returns>
private static byte[] encryptionTemporary(byte[] date, byte textCode, StateBase state)
{
if (date.Length > state.BufferSize - 20)
{
return(EncryptionDecryptSeparateDate.SendHeadEncryption(date, textCode, state)); //超出通过文件系统发送
}
state.SendDateLabel = RandomPublic.RandomNumber(16787); //给发送的数据进行编号
byte[] dateOverall = ByteToDate.OffsetEncryption(date, state.SendDateLabel, 2);
dateOverall[0] = PasswordCode._commonCode; dateOverall[1] = textCode;
return(dateOverall);
}
/// <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);
}
private static byte[] DecryptByte(byte[] receiveDate, ref byte[] residualpackage)
{
byte[] haveDate = null;
bool ddd = false;
int stickPackageCode = ByteToDate.ByteToInt(0, receiveDate);
if (stickPackageCode != PasswordCode._stickPackageCode)
{//第一个与暗号不相同；说明数据有可能是前面一个接下去的
ddd = true;
if (residualpackage != null)
{ //说明真的是前面一个延续下来的
byte[] addDate = new byte[receiveDate.Length + residualpackage.Length];
residualpackage.CopyTo(addDate, 0);
receiveDate.CopyTo(addDate, residualpackage.Length);
receiveDate = addDate; residualpackage = null;
}
else//不知道是什么数据，直接扔掉
{
return(null);
}
}
if (ddd)
{
stickPackageCode = ByteToDate.ByteToInt(0, receiveDate);
}
if (stickPackageCode == PasswordCode._stickPackageCode)
{ //第一个暗号相同，说明是一个新包开始了；不会是一个前面的残留包
if (receiveDate.Length < 9)
{
residualpackage = receiveDate; return(null);
}
int datelenth = ByteToDate.ByteToInt(4, receiveDate);
residualpackage = null; //对残留数据进行初始化
if (datelenth == receiveDate.Length - 8)
{ //说明整个收到的数据就是一个完整包
haveDate = new byte[datelenth];
Array.Copy(receiveDate, 8, haveDate, 0, datelenth);
}
else if (datelenth > receiveDate.Length - 8)
{ //说明数据没有收完全,把数据放在残留包里进行下一轮接收
residualpackage = receiveDate;
}
else
{//说明有至少二个包粘在一起
haveDate = new byte[datelenth];
Array.Copy(receiveDate, 8, haveDate, 0, datelenth);
residualpackage = new byte[receiveDate.Length - 8 - datelenth];
Array.Copy(receiveDate, 8 + datelenth, residualpackage, 0, receiveDate.Length - 8 - datelenth);
//把剩下的扔然放在残留里
}
}
return(haveDate);
}
/// <summary>
/// 发送方对一个文件包头进行加密得到一个byte[]
/// </summary>
/// <param name="fileSend"></param>
/// <returns></returns>
internal static byte[] FileHeadEncryption(FileState fileSend)
{
string fileName = EngineTool.StringRight(fileSend.FileName, "\\");
byte[] fileNameByte = Encoding.UTF8.GetBytes(fileName);
byte[] haveDate = new byte[15 + fileNameByte.Length];
haveDate[0] = PasswordCode._fileCode;
haveDate[1] = PasswordCode._sendUser;
haveDate[2] = PasswordCode._fileHeadCode;
ByteToDate.IntToByte(fileSend.FileLabel, 3, haveDate);
ByteToDate.IntToByte(fileSend.FileLenth, 7, haveDate);
fileNameByte.CopyTo(haveDate, 15);
return(haveDate);
}
/// <summary>
/// 把缓冲区的数据拿出来；并且把缓冲区清空；
/// </summary>
/// <param name="stateOne">StateBase</param>
/// <param name="insert">数据实际长度</param>
/// <returns>需要的数据</returns>
internal static byte[] DateOneManage(StateBase stateOne, int insert)
{
byte[] receiveByte = null;
if (stateOne.Buffer[0] == 0 && stateOne.BufferBackup != null && stateOne.BufferBackup.Length >= insert)
{
receiveByte = stateOne.BufferBackup; stateOne.BufferBackup = null;
} //主要用于缓冲区有扩大缩小
else
{
receiveByte = stateOne.Buffer;
}
byte[] haveDate = ByteToDate.ByteToByte(receiveByte, insert, 0);
Array.Clear(stateOne.Buffer, 0, stateOne.Buffer.Length);
return(haveDate);
}
/// <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>
/// 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);
}
/// <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);
}
/// <summary>
/// 文件数据分析处理中心；如果是发送方发过来的数据让接收方去处理
/// </summary>
/// <param name="fileDate">文件数据</param>
/// <param name="stateOne">StateBase</param>
/// <returns>处理以后的数据</returns>
internal static byte[] ReceiveDateTO(byte[] fileDate, StateBase stateOne)
{
if (fileDate.Length < 7)
{
return(null);
}
byte[] haveDate = null;
byte code = fileDate[1];
if (code == PasswordCode._receiveUser)
{
if (fileSend == null)//这里没有开启；直接让对方取消
{
haveDate = EncryptionDecryptFile.FileSevenEncryption(PasswordCode._sendUser, PasswordCode._fileCancel, ByteToDate.ByteToInt(3, fileDate));
}
else
{
haveDate = fileSend.ReceiveDateTO(fileDate, stateOne);
}
}
else if (code == PasswordCode._sendUser)
{
if (fileReceive == null)//这里没有开启；直接让对方取消
{
haveDate = EncryptionDecryptFile.FileSevenEncryption(PasswordCode._receiveUser, PasswordCode._fileCancel, ByteToDate.ByteToInt(3, fileDate));
}
else
{
haveDate = fileReceive.ReceiveDateTO(fileDate, stateOne);
}
}
return(haveDate);
}
/// <summary>
/// 发送方发过来的数据；
/// </summary>
/// <param name="receiveToDate">收到的数据</param>
/// <param name="stateOne">StateBase</param>
/// <returns>需要回复的数据</returns>
internal byte[] ReceiveDateTO(byte[] receiveToDate, StateBase stateOne)
{
byte[] haveDate = null;
int fileLabel = ByteToDate.ByteToInt(3, receiveToDate);
byte code = receiveToDate[2];
if (code == PasswordCode._fileHeadCode)//说明发送过来的是文件是否传输的包头信息
{
FileStream fs = null;
FileState stateHead = EncryptionDecryptFile.FileHeadDecrypt(receiveToDate, fs);
string fileName = ReceiveMust.ReceiveOrNo(stateHead.FileLabel, stateHead.FileName, stateHead.FileLenth);
if (fileName == "")
{
haveDate = EncryptionDecryptFile.FileSevenEncryption(PasswordCode._receiveUser, PasswordCode._fileRefuse, fileLabel);
}
else
{
fs = EngineTool.FileStreamWrite(fileName);
if (fs == null)
{
haveDate = EncryptionDecryptFile.FileSevenEncryption(PasswordCode._receiveUser, PasswordCode._fileRefuse, fileLabel);
}
else
{
ExpandBuffer(stateHead, stateOne);
stateHead.FileName = fileName; stateHead.Filestream = fs; stateHead.StateFile = 1;
FS.Add(stateHead);
haveDate = EncryptionDecryptFile.FileSevenEncryption(PasswordCode._receiveUser, PasswordCode._fileOk, fileLabel);
}
}
return(haveDate);
}
FileState state = FileLabelToState(fileLabel);
if (state == null)
{
if (code == PasswordCode._fileCancel)
{
return(null);
}
else
{
return(EncryptionDecryptFile.FileSevenEncryption(PasswordCode._receiveUser, PasswordCode._fileCancel, fileLabel));
}
}
else
{
switch (code)
{
case PasswordCode._fileSubjectCode: //收到的是文件主体代码
haveDate = EncryptionDecryptFile.FileSubjectDecrypt(state, receiveToDate);
ReceiveMust.FileProgress(state); //输出文件进度
if (state.FileOkLenth >= state.FileLenth) //说明文件接收完成了
{
FileRemove(fileLabel); ReceiveMust.ReceiveSuccess(fileLabel);
}
break;
case PasswordCode._fileCancel: //对方已经取消了这个文件；
FileRemove(fileLabel);
ReceiveMust.FileCancel(fileLabel);
break;
case PasswordCode._sendStop: //对方暂停发送
FileStopIn(state, ReceiveMust);
break;
case PasswordCode._fileContinue: //对方发过来一个续传的确认信息;你是否同意；
ExpandBuffer(state, stateOne); //有可能是stateOne换过了；
FileStopIn(state, ReceiveMust); //对方已经暂停了这个文件；我这边肯定也要先暂停掉
bool orStop = ReceiveMust.FileOrNotContingue(fileLabel); //让客户确认；是否续传
if (orStop)
{
haveDate = EncryptionDecryptFile.ReceiveContingueEncryption(PasswordCode._fileContinueOk, state);
state.StateFile = 1;
ReceiveMust.FileContinue(fileLabel);
}
else
{
haveDate = EncryptionDecryptFile.FileSevenEncryption(PasswordCode._receiveUser, PasswordCode._fileContinueNo, fileLabel);
}
break;
case PasswordCode._fileContinueOk: //对方同意续传
state.StateFile = 1;
ReceiveMust.FileContinue(fileLabel);
haveDate = EncryptionDecryptFile.FileSubjectDecrypt(state, receiveToDate);
if (state.FileOkLenth >= state.FileLenth) //说明文件接收完成了
{
FileRemove(fileLabel); ReceiveMust.ReceiveSuccess(fileLabel);
}
break;
case PasswordCode._fileContinueNo: //对方拒绝续传
ReceiveMust.FileNoContinue(fileLabel);
FileStopIn(state, ReceiveMust);
break;
}
}
return(haveDate);
}
