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Use unsafe blocks in project

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Memory pointer access is needed to improve performance
with basic input report copying as well as CRC32
validation
This commit is contained in:
Travis Nickles 2018-03-05 08:57:30 -06:00
parent f5f6002cdc
commit 8be2f9f271
3 changed files with 92 additions and 77 deletions
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153
DS4Windows/DS4Library/Crc32.cs
View File

@ -276,7 +276,7 @@ namespace DS4Windows
return crc;
}
public static uint CalculateFasterBTHash(ref uint seed, ref byte[] buffer, ref int start, ref int size)
public static unsafe uint CalculateFasterBTHash(ref uint seed, ref byte[] buffer, ref int start, ref int size)
{
/*uint crc = seed;
for (int i = start; i < size + start; i++)
@ -288,85 +288,88 @@ namespace DS4Windows
int i = start;
int bufsize = size;
//while (bufsize >= 16)
for (int j = 0; j < 4; j++)
fixed (byte* byteP = buffer)
{
uint one = (buffer[i++] |
(uint)(buffer[i++] << 8) |
(uint)(buffer[i++] << 16) |
(uint)(buffer[i++] << 24)) ^ crc;
uint two = buffer[i++] |
(uint)(buffer[i++] << 8) |
(uint)(buffer[i++] << 16) |
(uint)(buffer[i++] << 24);
uint three = (buffer[i++] |
(uint)(buffer[i++] << 8) |
(uint)(buffer[i++] << 16) |
(uint)(buffer[i++] << 24));
uint four = buffer[i++] |
(uint)(buffer[i++] << 8) |
(uint)(buffer[i++] << 16) |
(uint)(buffer[i++] << 24);
for (int j = 0; j < 4; j++)
{
uint one = (byteP[i++] |
(uint)(byteP[i++] << 8) |
(uint)(byteP[i++] << 16) |
(uint)(byteP[i++] << 24)) ^ crc;
uint two = byteP[i++] |
(uint)(byteP[i++] << 8) |
(uint)(byteP[i++] << 16) |
(uint)(byteP[i++] << 24);
uint three = (byteP[i++] |
(uint)(byteP[i++] << 8) |
(uint)(byteP[i++] << 16) |
(uint)(byteP[i++] << 24));
uint four = byteP[i++] |
(uint)(byteP[i++] << 8) |
(uint)(byteP[i++] << 16) |
(uint)(byteP[i++] << 24);
crc = secondLook[15, one & 0xFF] ^
secondLook[14, (one >> 8) & 0xFF] ^
secondLook[13, (one >> 16) & 0xFF] ^
secondLook[12, (one >> 24) & 0xFF] ^
secondLook[11, two & 0xFF] ^
secondLook[10, (two >> 8) & 0xFF] ^
secondLook[9, (two >> 16) & 0xFF] ^
secondLook[8, (two >> 24) & 0xFF] ^
secondLook[7, three & 0xFF] ^
secondLook[6, (three >> 8) & 0xFF] ^
secondLook[5, (three >> 16) & 0xFF] ^
secondLook[4, (three >> 24) & 0xFF] ^
secondLook[3, four & 0xFF] ^
secondLook[2, (four >> 8) & 0xFF] ^
secondLook[1, (four >> 16) & 0xFF] ^
defaultTable[(four >> 24) & 0xFF];
crc = secondLook[15, one & 0xFF] ^
secondLook[14, (one >> 8) & 0xFF] ^
secondLook[13, (one >> 16) & 0xFF] ^
secondLook[12, (one >> 24) & 0xFF] ^
secondLook[11, two & 0xFF] ^
secondLook[10, (two >> 8) & 0xFF] ^
secondLook[9, (two >> 16) & 0xFF] ^
secondLook[8, (two >> 24) & 0xFF] ^
secondLook[7, three & 0xFF] ^
secondLook[6, (three >> 8) & 0xFF] ^
secondLook[5, (three >> 16) & 0xFF] ^
secondLook[4, (three >> 24) & 0xFF] ^
secondLook[3, four & 0xFF] ^
secondLook[2, (four >> 8) & 0xFF] ^
secondLook[1, (four >> 16) & 0xFF] ^
defaultTable[(four >> 24) & 0xFF];
bufsize -= 16;
bufsize -= 16;
}
//while (bufsize >= 8)
//if (bufsize >= 8)
uint one8 = (byteP[i++] |
(uint)(byteP[i++] << 8) |
(uint)(byteP[i++] << 16) |
(uint)(byteP[i++] << 24)) ^ crc;
uint two8 = byteP[i++] |
(uint)(byteP[i++] << 8) |
(uint)(byteP[i++] << 16) |
(uint)(byteP[i++] << 24);
crc = secondLook[7, one8 & 0xFF] ^
secondLook[6, (one8 >> 8) & 0xFF] ^
secondLook[5, (one8 >> 16) & 0xFF] ^
secondLook[4, one8 >> 24] ^
secondLook[3, two8 & 0xFF] ^
secondLook[2, (two8 >> 8) & 0xFF] ^
secondLook[1, (two8 >> 16) & 0xFF] ^
defaultTable[two8 >> 24];
bufsize -= 8;
/*crc ^= buffer[i++] |
(uint)(buffer[i++] << 8) |
(uint)(buffer[i++] << 16) |
(uint)(buffer[i++] << 24);// i = i + 4;
//crc ^= buffer[i];
crc = secondLook[3, (crc & 0xFF)] ^
secondLook[2, ((crc >> 8) & 0xFF)] ^
secondLook[1, ((crc >> 16) & 0xFF)] ^
defaultTable[crc >> 24];
bufsize -= 4;
*/
//while (--bufsize >= 0)
//{
crc = (crc >> 8) ^ defaultTable[(crc & 0xFF) ^ byteP[i++]];// i++;
crc = (crc >> 8) ^ defaultTable[(crc & 0xFF) ^ byteP[i++]];// i++;
//}
}
//while (bufsize >= 8)
//if (bufsize >= 8)
uint one8 = (buffer[i++] |
(uint)(buffer[i++] << 8) |
(uint)(buffer[i++] << 16) |
(uint)(buffer[i++] << 24)) ^ crc;
uint two8 = buffer[i++] |
(uint)(buffer[i++] << 8) |
(uint)(buffer[i++] << 16) |
(uint)(buffer[i++] << 24);
crc = secondLook[7, one8 & 0xFF] ^
secondLook[6, (one8 >> 8) & 0xFF] ^
secondLook[5, (one8 >> 16) & 0xFF] ^
secondLook[4, one8 >> 24] ^
secondLook[3, two8 & 0xFF] ^
secondLook[2, (two8 >> 8) & 0xFF] ^
secondLook[1, (two8 >> 16) & 0xFF] ^
defaultTable[two8 >> 24];
bufsize -= 8;
/*crc ^= buffer[i++] |
(uint)(buffer[i++] << 8) |
(uint)(buffer[i++] << 16) |
(uint)(buffer[i++] << 24);// i = i + 4;
//crc ^= buffer[i];
crc = secondLook[3, (crc & 0xFF)] ^
secondLook[2, ((crc >> 8) & 0xFF)] ^
secondLook[1, ((crc >> 16) & 0xFF)] ^
defaultTable[crc >> 24];
bufsize -= 4;
*/
//while (--bufsize >= 0)
//{
crc = (crc >> 8) ^ defaultTable[(crc & 0xFF) ^ buffer[i++]];// i++;
crc = (crc >> 8) ^ defaultTable[(crc & 0xFF) ^ buffer[i++]];// i++;
//}
return crc;
}

15
DS4Windows/DS4Library/DS4Device.cs
View File

@ -697,7 +697,7 @@ namespace DS4Windows
const uint DefaultPolynomial = 0xedb88320u;
uint HamSeed = 2351727372;
private void performDs4Input()
private unsafe void performDs4Input()
{
firstActive = DateTime.UtcNow;
NativeMethods.HidD_SetNumInputBuffers(hDevice.safeReadHandle.DangerousGetHandle(), 2);
@ -749,7 +749,18 @@ namespace DS4Windows
timeoutEvent = false;
if (res == HidDevice.ReadStatus.Success)
{
Array.Copy(btInputReport, 2, inputReport, 0, inputReport.Length);
//Array.Copy(btInputReport, 2, inputReport, 0, inputReport.Length);
fixed (byte* byteP = &btInputReport[2], imp = inputReport)
{
byte* btImp = byteP;
byte* finImp = imp;
for (int j = 0; j < BT_INPUT_REPORT_LENGTH-2;j++)
{
finImp[j] = btImp[j];
//*finImp = *btImp;
//btImp++; finImp++;
}
}
//uint recvCrc32 = BitConverter.ToUInt32(btInputReport, BT_INPUT_REPORT_CRC32_POS);
uint recvCrc32 = btInputReport[BT_INPUT_REPORT_CRC32_POS] |

1
DS4Windows/DS4Windows.csproj
View File

@ -92,6 +92,7 @@
<GenerateSerializationAssemblies>On</GenerateSerializationAssemblies>
<LangVersion>6</LangVersion>
<DebugSymbols>false</DebugSymbols>
<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
</PropertyGroup>
<PropertyGroup Condition="'$(Configuration)|$(Platform)' == 'Debug|x86'">
<DebugSymbols>true</DebugSymbols>