public int ReadInt(void *statePtr)
{
Debug.Assert(sizeInBits != 0);
var valuePtr = (byte *)statePtr + (int)byteOffset;
var fmt = (int)format;
switch (fmt)
{
case kFormatBit:
if (sizeInBits == 1)
{
return(MemoryHelpers.ReadSingleBit(valuePtr, bitOffset) ? 1 : 0);
}
return((int)MemoryHelpers.ReadMultipleBitsAsUInt(valuePtr, bitOffset, sizeInBits));
case kFormatSBit:
if (sizeInBits == 1)
{
return(MemoryHelpers.ReadSingleBit(valuePtr, bitOffset) ? 1 : -1);
}
return(MemoryHelpers.ReadExcessKMultipleBitsAsInt(valuePtr, bitOffset, sizeInBits));
case kFormatInt:
case kFormatUInt:
Debug.Assert(sizeInBits == 32, "INT and UINT state must have sizeInBits=32");
Debug.Assert(bitOffset == 0, "INT and UINT state must be byte-aligned");
if (fmt == kFormatUInt)
{
Debug.Assert(*(uint *)valuePtr <= int.MaxValue, "UINT must fit in the int");
}
return(*(int *)valuePtr);
case kFormatShort:
Debug.Assert(sizeInBits == 16, "SHRT state must have sizeInBits=16");
Debug.Assert(bitOffset == 0, "SHRT state must be byte-aligned");
return(*(short *)valuePtr);
case kFormatUShort:
Debug.Assert(sizeInBits == 16, "USHT state must have sizeInBits=16");
Debug.Assert(bitOffset == 0, "USHT state must be byte-aligned");
return(*(ushort *)valuePtr);
case kFormatByte:
Debug.Assert(sizeInBits == 8, "BYTE state must have sizeInBits=8");
Debug.Assert(bitOffset == 0, "BYTE state must be byte-aligned");
return(*valuePtr);
case kFormatSByte:
Debug.Assert(sizeInBits == 8, "SBYT state must have sizeInBits=8");
Debug.Assert(bitOffset == 0, "SBYT state must be byte-aligned");
return(*(sbyte *)valuePtr);
// Not supported:
// - kFormatLong
// - kFormatULong
// - kFormatFloat
// - kFormatDouble
default:
throw new InvalidOperationException($"State format '{format}' is not supported as integer format");
}
}