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CRC implemented

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This commit is contained in:
Jake Visser 2017-07-20 18:31:57 -07:00
commit 2ecf26bc89
1 changed files with 84 additions and 61 deletions
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73
qcbadge/Controllers/HomeController.cs
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@ -151,7 +151,7 @@ namespace qcbadge.Controllers
// 0x0201040319DC190FFFD304AAAABBCCDDDDDDDDDDEE090841524F5947424956 // 0x0201040319DC190FFFD304AAAABBCCDDDDDDDDDDEE090841524F5947424956
// 0x0201040319DC190FFFD3040122BBCCDDDDDDDDDDEE090841524F5947424956 = Badgeid = 122/290 // 0x0201040319DC190FFFD3040122BBCCDDDDDDDDDDEE090841524F5947424956 = Badgeid = 122/290
// The advt data only.. 0xD304AAAABBCCDDDDDDDDDDEE // The advt data only.. 0xD304AAAABBCCDDDDDDDDDDEE
// The advt data only id 122 0xD3040122BBCCDDDDDDDDDDEE // The advt data only id 122 0xD3040122BBCCDDDDDDDDDDDDEE
// http://localhost:55091/Home/Update?advertdata64=AgEEAxncGQ//0wQBIrvM3d3d3d3uCQhBUk9ZR0JJVg== // http://localhost:55091/Home/Update?advertdata64=AgEEAxncGQ//0wQBIrvM3d3d3d3uCQhBUk9ZR0JJVg==
if (String.IsNullOrEmpty(advertData) && String.IsNullOrEmpty(advertData64)) if (String.IsNullOrEmpty(advertData) && String.IsNullOrEmpty(advertData64))
@ -193,20 +193,21 @@ namespace qcbadge.Controllers
//lets do some CRC things //lets do some CRC things
String crcData = advertData.Substring(6, 20); String crcData = advertData.Substring(6, 20);
System.Diagnostics.Debug.WriteLine("CRC to check: " + crcData.ToString()); System.Diagnostics.Debug.WriteLine("CRC to check: " + crcData);
ushort crcrsp = CCITT_CRC16(crcData); UInt16 crcrsp = CCITT_CRC16(crcData);
System.Diagnostics.Debug.WriteLine("CRC resp: " + crcrsp.ToString()); System.Diagnostics.Debug.WriteLine("CRC resp: " + crcrsp);
byte[] recbytes = new byte[2]; byte[] recbytes = new byte[2];
recbytes[0] = BitConverter.GetBytes(crcrsp)[0]; recbytes[0] = BitConverter.GetBytes(crcrsp)[0];
recbytes[1] = BitConverter.GetBytes(crcrsp)[1]; recbytes[1] = BitConverter.GetBytes(crcrsp)[1];
System.Diagnostics.Debug.WriteLine("CRC 1st byte: " + recbytes[0].ToString()); System.Diagnostics.Debug.WriteLine("CRC 1st byte: " + recbytes[0]);
System.Diagnostics.Debug.WriteLine("CRC 2nd byte: " + recbytes[1].ToString()); System.Diagnostics.Debug.WriteLine("CRC 2nd byte: " + recbytes[1]);
byte crc8res = (byte)(recbytes[0] ^ recbytes[1]); byte crc8res = (byte)(recbytes[0] ^ recbytes[1]);
System.Diagnostics.Debug.WriteLine("CRC the byte: " + crc8res.ToString()); System.Diagnostics.Debug.WriteLine("CRC the byte: " + crc8res);
String crcFinal = advertData.Substring(26, 2);
if(crcFinal.Equals(crc8res))
{
String qcData = advertData.Substring(6, 20); String qcData = advertData.Substring(6, 22);
System.Diagnostics.Debug.WriteLine(qcData); System.Diagnostics.Debug.WriteLine(qcData);
String badgeIdStr = qcData.Substring(0, 4); String badgeIdStr = qcData.Substring(0, 4);
@ -252,6 +253,14 @@ namespace qcbadge.Controllers
{ {
return StatusCode(200); return StatusCode(200);
} }
}
else
{
return StatusCode(200);
}
@ -266,28 +275,42 @@ namespace qcbadge.Controllers
} }
private ushort CCITT_CRC16(string strInput) private UInt16 CCITT_CRC16(string strInput)
{ {
ushort data;
ushort crc = 0xFFFF;
byte[] bytes = StringToByteArray(strInput); byte[] bytes = StringToByteArray(strInput);
for (int j = 0; j < bytes.Length; j++)
UInt16 crc = 0xB8F6;
//crc = (unsigned char)(crc >> 8) | (crc << 8);
//crc ^= (unsigned char) *sbuf;
//crc ^= (unsigned char)(crc & 0xff) >> 4;
//crc ^= (crc << 8) << 4;
//crc ^= ((crc & 0xff) << 4) << 1;
//len--;
//sbuf++;
for(int j = 0; j < 10; j++)
{ {
crc = (ushort)(crc ^ bytes[j]); System.Diagnostics.Debug.WriteLine("sbuf: " + j);
for (int i = 0; i < 8; i++) System.Diagnostics.Debug.WriteLine("byte: " + bytes[j]);
{
if ((crc & 0x0001) == 1) crc = (UInt16)(((crc >> 8) | (crc << 8)) & 0xffff);
crc = (ushort)((crc >> 1) ^ 0x8408); crc ^= (UInt16)(bytes[j] & 0xff);//byte to int, trunc sign
else crc ^= (UInt16)((crc & 0xff) >> 4);
crc >>= 1; crc ^= (UInt16)((crc << 12) & 0xffff );
crc ^= (UInt16)(((crc & 0xff) << 5) & 0xffff);
} }
} crc &= 0xffff;
crc = (ushort)~crc;
data = crc;
crc = (ushort)((crc << 8) ^ (data >> 8 & 0xFF));
return crc; return crc;
} }
public static byte[] StringToByteArray(String hex) public static byte[] StringToByteArray(String hex)
{ {
int NumberChars = hex.Length; int NumberChars = hex.Length;