/// <summary>
/// 解包NP层协议数据包
/// </summary>
/// <param name="npData"></param>
/// <param name="npLayer"></param>
/// <param name="mapLayer"></param>
/// <returns></returns>
private static CmccUnpacketResult UnpacketNPA(byte[] npData, ref NPLayer npLayer, ref MapLayer mapLayer)
{
if (npData.Length <= 9)
{
return CmccUnpacketResult.OtherError; // without map data
}
int offset = 0;
npLayer.siteId = BitConverter.ToUInt32(npData, offset);
offset += 4;
npLayer.subId = npData[offset++];
npLayer.packetId = BitConverter.ToUInt16(npData, offset);
offset += 2;
npLayer.npFlag = npData[offset++];
mapLayer.mapId = npData[offset++];
byte[] mapData = new byte[npData.Length - 9];
Array.Copy(npData, offset, mapData, 0, mapData.Length);
offset += mapData.Length;
switch (mapLayer.mapId)
{
case CmccConst.MapId.A:
case CmccConst.MapId.B:
case CmccConst.MapId.C:
return UnpacketMapLayer(mapData, ref mapLayer);
default:
return CmccUnpacketResult.OtherError;
}
}
/// <summary>
/// 解包AP.A协议数据包
/// </summary>
/// <param name="apData"></param>
/// <param name="npLayer"></param>
/// <param name="mapLayer"></param>
/// <returns></returns>
private static CmccUnpacketResult UnpacketAPC(byte[] apData, ref NPLayer npLayer, ref MapLayer mapLayer)
{
List<byte> apDataEx = new List<byte>(); // Cancel Converting and remove start/stop flag
ProtocolBase.PrintBytes("apData", apData);
bool convert = false;
foreach (byte element in apData)
{
if (element == CmccConst.ApFlag.A)
{
continue;
}
if (convert)
{
convert = false;
switch (element)
{
case 0x5D:
apDataEx.Add(0x5E);
break;
case 0x7D:
apDataEx.Add(0x7E);
break;
default:
return CmccUnpacketResult.OtherError;
}
}
else
{
if (element == 0x5E)
{
convert = true;
}
else
{
apDataEx.Add(element);
}
}
}
byte[] bytes = apDataEx.ToArray();
if (bytes.Length <= 4)
{
return CmccUnpacketResult.OtherError; // without np data
}
int offset = 0;
ProtocolBase.PrintBytes("UnpacketAPA", bytes);
if (bytes[offset++] != CmccConst.ApId.C)
{
return CmccUnpacketResult.OtherError;
}
npLayer.npId = bytes[offset++];
byte[] npData = new byte[bytes.Length - 4];
Array.Copy(bytes, offset, npData, 0, npData.Length);
offset += npData.Length;
ushort crc_count = 0;
ushort crc_read = 0;
crc_count = ProtocolBase.CRC16(bytes[0], crc_count);
crc_count = ProtocolBase.CRC16(bytes[1], crc_count);
crc_count = ProtocolBase.CRC16(npData, crc_count);
crc_read = BitConverter.ToUInt16(bytes, offset);
offset += 2;
if (crc_count != crc_read)
{
return CmccUnpacketResult.CrcError;
}
switch (npLayer.npId)
{
case CmccConst.NpId.A:
return UnpacketNPA(npData, ref npLayer, ref mapLayer);
default:
return CmccUnpacketResult.OtherError;
}
}
/// <summary>
/// 解包AP.B层协议数据包
/// </summary>
/// <param name="apData"></param>
/// <param name="npLayer"></param>
/// <param name="mapLayer"></param>
/// <returns></returns>
private static CmccUnpacketResult UnpacketAPB(byte[] apData, ref NPLayer npLayer, ref MapLayer mapLayer)
{
List<byte> apDataEx = new List<byte>(); // Cancel Spliting and remove start/stop flag
char hiChar = '-';
char loChar = '-';
byte combine = 0;
foreach (byte element in apData)
{
if (element == CmccConst.ApFlag.B)
{
continue;
}
if (hiChar != '-')
{
loChar = (char)element;
if (!ProtocolBase.CombineByte(hiChar, loChar, out combine))
{
return CmccUnpacketResult.OtherError;
}
apDataEx.Add(combine);
hiChar = '-';
}
else
{
hiChar = (char)element;
}
}
byte[] bytes = apDataEx.ToArray();
if (bytes.Length <= 4)
{
return CmccUnpacketResult.OtherError; // without np data
}
int offset = 0;
if (bytes[offset++] != CmccConst.ApId.B)
{
return CmccUnpacketResult.OtherError;
}
npLayer.npId = bytes[offset++];
byte[] npData = new byte[bytes.Length - 4];
Array.Copy(bytes, offset, npData, 0, npData.Length);
offset += npData.Length;
ushort crc_count = 0;
ushort crc_read = 0;
crc_count = ProtocolBase.CRC16(bytes[0], crc_count);
crc_count = ProtocolBase.CRC16(bytes[1], crc_count);
crc_count = ProtocolBase.CRC16(npData, crc_count);
crc_read = BitConverter.ToUInt16(bytes, offset);
offset += 2;
if (crc_count != crc_read)
{
return CmccUnpacketResult.CrcError;
}
switch (npLayer.npId)
{
case CmccConst.NpId.A:
return UnpacketNPA(npData, ref npLayer, ref mapLayer);
default:
return CmccUnpacketResult.OtherError;
}
}
/// <summary>
/// 打包NP.A
/// </summary>
/// <param name="npLayer"></param>
/// <param name="mapId"></param>
/// <param name="mapData"></param>
/// <returns></returns>
private static List<byte> PacketNPLayer(NPLayer npLayer, byte mapId, List<byte> mapData)
{
List<byte> npData = new List<byte>();
byte[] bytes = null;
bytes = BitConverter.GetBytes(npLayer.siteId);
foreach (byte element in bytes)
{
npData.Add(element);
}
npData.Add(npLayer.subId);
bytes = BitConverter.GetBytes(npLayer.packetId);
foreach (byte element in bytes)
{
npData.Add(element);
}
npData.Add(npLayer.npFlag);
npData.Add(mapId);
foreach (byte element in mapData)
{
npData.Add(element);
}
return npData;
}
/// <summary>
/// 探测并解包数据,属于外部接口
/// </summary>
/// <param name="data"></param>
/// <param name="apLayer"></param>
/// <param name="npLayer"></param>
/// <param name="mapLayer"></param>
/// <returns></returns>
public static CmccUnpacketResult Unpacket(byte[] data, ref APLayer apLayer, ref NPLayer npLayer, ref MapLayer mapLayer)
{
if (data == null)
{
return CmccUnpacketResult.OtherError;
}
int begin = -1;
int end = -1;
for (int n = 0; n < data.Length; n++)
{
if (data[n] == CmccConst.ApFlag.A)
{
if (data[n + 1] == CmccConst.ApId.A)
{
apLayer.apId = CmccConst.ApId.A;
begin = n;
break;
}
else if (data[n + 1] == CmccConst.ApId.C)
{
apLayer.apId = CmccConst.ApId.C;
begin = n;
break;
}
}
if (data[n] == CmccConst.ApFlag.B)
{
apLayer.apId = CmccConst.ApId.B;
begin = n;
break;
}
}
if (begin < 0)
{
return CmccUnpacketResult.OtherError;
}
for (int n = begin + 1; n < data.Length; n++)
{
if (data[n] == data[begin])
{
end = n;
break;
}
}
if (end < 0)
{
return CmccUnpacketResult.OtherError;
}
byte[] apData = new byte[end - begin + 1];
for (int n = 0; n < apData.Length; n++)
{
apData[n] = data[n + begin];
}
switch (apLayer.apId)
{
case CmccConst.ApId.A:
return UnpacketAPA(apData, ref npLayer, ref mapLayer);
case CmccConst.ApId.B:
return UnpacketAPB(apData, ref npLayer, ref mapLayer);
case CmccConst.ApId.C:
return UnpacketAPC(apData, ref npLayer, ref mapLayer);
default:
return CmccUnpacketResult.OtherError;
}
}
/// <summary>
/// 提供给用户的打包接口
/// </summary>
/// <param name="apLayer"></param>
/// <param name="npLayer"></param>
/// <param name="mapLayer"></param>
/// <returns></returns>
public static byte[] Packet(APLayer apLayer, NPLayer npLayer, MapLayer mapLayer)
{
List<byte> apData = new List<byte>();
List<byte> npData = new List<byte>();
List<byte> mapData = new List<byte>();
// 打包MAP层数据包
mapData = PacketMapLayer(mapLayer);
switch (npLayer.npId)
{
case CmccConst.NpId.A:
npData = PacketNPLayer(npLayer, mapLayer.mapId, mapData);
break;
default:
npData = mapData;
break;
}
switch (apLayer.apId)
{
case CmccConst.ApId.A:
apData = PacketAPA(npLayer.npId, npData);
break;
case CmccConst.ApId.B:
apData = PacketAPB(npLayer.npId, npData);
break;
case CmccConst.ApId.C:
apData = PacketAPC(npLayer.npId, npData);
break;
default:
apData = npData;
break;
}
return apData.ToArray();
}