bool CheckCRC(HeaderType type, Byte[] args, Byte[] crc)
{
Crc16Ccitt crc16 = new Crc16Ccitt(ZModem_Protocol.Crc16Ccitt.InitialCrcValue.Zeros);
Byte[] HeaderCrc = crc16.ComputeChecksumBytes(new Byte[5] {
Convert.ToByte((int)type), args[0], args[1], args[2], args[3]
});
if ((HeaderCrc[0] == crc[1]) && (HeaderCrc[1] == crc[0]))
{
return(true);
}
else
{
return(false);
}
}
public static byte[] BuildZFILEFrame(string FileName, int FileSize)
{
Queue <byte> bframe2send = new Queue <byte>();
string frame = BuildHexFrame(HeaderType.ZFILE, (int)ZFILE_Header_ZF0.NOTHING, (int)ZFILE_Header_ZF1.ZMCLOB, (int)ZFILE_Header_ZF2.NOTHING, (int)ZFILE_Header_ZF3.NOTHING);
foreach (char c in frame)
{
bframe2send.Enqueue((byte)c);
}
Queue <byte> binframe = new Queue <byte>();
foreach (char c in FileName)
{
binframe.Enqueue((byte)c);
}
binframe.Enqueue((byte)'\0');
byte[] b4crc = binframe.Concat(new byte[] { (byte)ZDLE_Sequence.ZCRCW }).ToArray();
//string size = FileSize.ToString();
//foreach (char c in size)
// binframe.Enqueue((byte)c);
//binframe.Enqueue((byte)' ');
//for (int i = 0; i < 7; i++)
//{
// binframe.Enqueue((byte)'0');
// binframe.Enqueue((byte)'');
//}
binframe.Enqueue((byte)ControlBytes.ZDLE);
binframe.Enqueue((byte)ZDLE_Sequence.ZCRCW);
Crc16Ccitt crc = new Crc16Ccitt(Crc16Ccitt.InitialCrcValue.Zeros);
byte[] crcdata = crc.ComputeChecksumBytes(b4crc);
binframe.Enqueue(crcdata[0]);
binframe.Enqueue(crcdata[1]);
return(bframe2send.Concat(binframe).ToArray());
}
bool CheckCRC()
{
Crc16Ccitt crc16 = new Crc16Ccitt(ZModem_Protocol.Crc16Ccitt.InitialCrcValue.Zeros);
if (data.Length > sizeOfFrame)
{
Array.Resize <byte>(ref data, sizeOfFrame);
}
Byte[] r = crc16.ComputeChecksumBytes(data);
MemoryStream ms = new MemoryStream();
if ((r[0] == crc2) && (r[1] == crc1))
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Constructor. It decode a Byte array to a ZModem header.
/// </summary>
/// <param name="data">Byte array</param>
/// <param name="startIndex">index of the byte in the array</param>
public Header(Byte[] data, int startIndex)
{
if (startIndex < 0)
{
return;
}
int index = startIndex;
if (data[index] == Convert.ToByte(ControlBytes.ZPAD))
{
index++;
if (data[index] == Convert.ToByte(ControlBytes.ZDLE))
{
index++;
if (data[index] == Convert.ToByte(ControlBytes.ZBIN))
{
index++;
type = (HeaderType)Enum.Parse(typeof(HeaderType), ((int)DecodeByte(data, ref index)).ToString());
index++;
arg1 = DecodeByte(data, ref index);
index++;
arg2 = DecodeByte(data, ref index);
index++;
arg3 = DecodeByte(data, ref index);
index++;
arg4 = DecodeByte(data, ref index);
index++;
crc1 = DecodeByte(data, ref index);
index++;
crc2 = DecodeByte(data, ref index);
Byte[] b = new Byte[5];
b[0] = Convert.ToByte((int)type);
b[1] = arg1;
b[2] = arg2;
b[3] = arg3;
b[4] = arg4;
Crc16Ccitt crccomp = new Crc16Ccitt(0);
Byte[] crcAttempted = crccomp.ComputeChecksumBytes(b);
if ((crc1 != crcAttempted[1]) || (crc2 != crcAttempted[0]))
{
valid = false;
return; //erreur crc
}
else
{
valid = true;
}
endofHeader = index;
}
}
else if (data[index] == Convert.ToByte(ControlBytes.ZPAD)) //Header Hex
{
index++;
if (data[index] == Convert.ToByte(ControlBytes.ZDLE))
{
index++;
if (data[index] == Convert.ToByte(ControlBytes.ZHEX))
{
index++;
string val = ((char)DecodeByte(data, ref index)).ToString();
index++;
val += ((char)DecodeByte(data, ref index)).ToString();
type = (HeaderType)Enum.Parse(typeof(HeaderType), val);
index++;
val = ((char)DecodeByte(data, ref index)).ToString();
index++;
val += ((char)DecodeByte(data, ref index)).ToString();
int a1 = Convert.ToInt32(val, 16);
arg1 = Convert.ToByte(a1);
index++;
val = ((char)DecodeByte(data, ref index)).ToString();
index++;
val += ((char)DecodeByte(data, ref index)).ToString();
int a2 = Convert.ToInt32(val, 16);
arg2 = Convert.ToByte(a2);
index++;
val = ((char)DecodeByte(data, ref index)).ToString();
index++;
val += ((char)DecodeByte(data, ref index)).ToString();
int a3 = Convert.ToInt32(val, 16);
arg3 = Convert.ToByte(a3);
index++;
val = ((char)DecodeByte(data, ref index)).ToString();
index++;
val += ((char)DecodeByte(data, ref index)).ToString();
int a4 = Convert.ToInt32(val, 16);
arg4 = Convert.ToByte(a4);
index++;
val = ((char)DecodeByte(data, ref index)).ToString();
index++;
val += ((char)DecodeByte(data, ref index)).ToString();
int c1 = Convert.ToInt32(val, 16);
crc1 = Convert.ToByte(c1);
index++;
val = ((char)DecodeByte(data, ref index)).ToString();
index++;
val += ((char)DecodeByte(data, ref index)).ToString();
int c2 = Convert.ToInt32(val, 16);
crc2 = Convert.ToByte(c2);
Byte[] b = new Byte[5];
b[0] = Convert.ToByte((int)type);
b[1] = arg1;
b[2] = arg2;
b[3] = arg3;
b[4] = arg4;
Crc16Ccitt crccomp = new Crc16Ccitt(0);
Byte[] crcAttempted = crccomp.ComputeChecksumBytes(b);
if ((crc1 != crcAttempted[1]) || (crc2 != crcAttempted[0]))
{
valid = false;
return; //erreur crc
}
else
{
valid = true;
}
endofHeader = index;
}
}
}
}
}
