/// <summary>
/// 对文件主体进行加密
/// </summary>
/// <param name="fileSend">FileState</param>
/// <param name="bufferSize">缓冲区大小</param>
/// <returns>加密之后数据</returns>
internal static byte[] FileSubjectEncryption(FileState fileSend, int bufferSize)
{
byte[] dateOverall = null;
if (fileSend.StateFile == 2)//说明我这里已经暂停了；要发一个暂停的消息给对方
{
dateOverall = FileSevenEncryption(CipherCode._sendUser, CipherCode._sendStop, fileSend.FileLabel);
return(dateOverall);
}
int BufferSize = bufferSize - 24;
if (fileSend.FileLenth - fileSend.FileOkLenth < BufferSize)
{
BufferSize = (int)(fileSend.FileLenth - fileSend.FileOkLenth);
}
byte[] haveDate = new byte[BufferSize];
int haveDatelenth = 1;
try
{
haveDatelenth = fileSend.Filestream.Read(haveDate, 0, BufferSize);
}//异常说明这个文件已经被我方取消掉；返回一个取消信息给对方
catch { return(EncDecFile.FileSevenEncryption(CipherCode._sendUser, CipherCode._fileCancel, fileSend.FileLabel)); }
if (haveDatelenth <= 0)
{
return(null); //说明数据发完了,文件会到外面去关掉
}
fileSend.FileOkLenth = fileSend.FileOkLenth + haveDatelenth;
dateOverall = ByteToDate.OffsetEncryption(haveDate, fileSend.FileLabel, 3);
dateOverall[0] = CipherCode._fileCode;
dateOverall[1] = CipherCode._sendUser;
dateOverall[2] = CipherCode._fileSubjectCode;
return(dateOverall);
}
/// <summary>
/// 对文件主体进行解密；
/// </summary>
/// <param name="fileSend"></param>
/// <param name="receiveDate"></param>
/// <returns></returns>
internal static byte[] FileSubjectDecrypt(FileState fileSend, byte[] receiveDate)
{
byte[] haveDate = null;
if (fileSend.StateFile == 2)//说明我这里已经暂停了；要发一个暂停的消息给对方
{
return(FileSevenEncryption(CipherCode._receiveUser, CipherCode._sendStop, fileSend.FileLabel));
}
haveDate = new byte[receiveDate.Length - 7];
Array.Copy(receiveDate, 7, haveDate, 0, haveDate.Length);
try
{
fileSend.Filestream.Write(haveDate, 0, haveDate.Length);
}//异常说明这个文件已经被我方取消掉；返回一个取消信息给对方
catch { return(EncDecFile.FileSevenEncryption(CipherCode._receiveUser, CipherCode._fileCancel, fileSend.FileLabel)); }
fileSend.FileOkLenth = fileSend.FileOkLenth + haveDate.Length;
haveDate = FileSevenEncryption(CipherCode._receiveUser, CipherCode._dateSuccess, fileSend.FileLabel);
return(haveDate);
}