//============================================================================
// NDataEncoder::Hex_Decode : Decode from hex.
//----------------------------------------------------------------------------
NData NDataEncoder::Hex_Decode(const NString &theValue)
{ NIndex n, theSize;
NData theResult;
uint8_t *dataPtr;
const char *textPtr;
unsigned int byteVal;
// Validate our parameters
NN_ASSERT(theValue.IsEmpty() || (theValue.GetSize() % 2) == 0);
// Get the state we need
theSize = theValue.GetSize() / 2;
dataPtr = theResult.AppendData(theSize);
textPtr = theValue.GetUTF8();
if (theSize == 0 || dataPtr == NULL || textPtr == NULL)
return(theResult);
// Convert the string
//
// Visual Studio does not support 'hh' correctly, so we need to read byte
// values into a temporary variable:
//
// https://connect.microsoft.com/VisualStudio/feedback/details/416843/sscanf-cannot-not-handle-hhd-format
for (n = 0; n < theSize; n++)
{
sscanf(textPtr, "%2x", &byteVal);
NN_ASSERT((byteVal & 0xFFFFFF00) == 0);
dataPtr[n] = (uint8_t) byteVal;
textPtr += 2;
}
return(theResult);
}
//============================================================================
// NNumber::SetValue : Set the value.
//----------------------------------------------------------------------------
bool NNumber::SetValue(const NString &theValue)
{ NRange foundDot, foundE;
NIndex thePrecision;
int64_t valueInteger;
float64_t valueReal;
// Parse the value
//
// Some integers will also pass parsing as floats, however we coerce these
// back to integers when possible to allow us to use more tightly packed
// types for storage in the future.
if (sscanf(theValue.GetUTF8(), "%lf", &valueReal) == 1)
{
// Get the state we need
foundDot = theValue.Find(".");
foundE = theValue.Find("e", kNStringNoCase);
if (foundDot.IsEmpty() || !foundE.IsEmpty())
thePrecision = kDecimalsFloat64;
else
thePrecision = theValue.GetSize() - foundDot.GetNext();
// Cast the value
if (foundDot.IsEmpty() && foundE.IsEmpty() && valueReal >= kInt64Min && valueReal <= kInt64Max)
SetInt64((int64_t) valueReal);
else if (thePrecision <= kDecimalsFloat32 && valueReal >= kFloat32Min && valueReal <= kFloat32Max)
SetFloat32((float32_t) valueReal);
else
SetFloat64(valueReal);
return(true);
}
else if (sscanf(theValue.GetUTF8(), "%lld", &valueInteger) == 1 ||
sscanf(theValue.GetUTF8(), "%llx", &valueInteger) == 1 ||
sscanf(theValue.GetUTF8(), "0x%llx", &valueInteger) == 1 ||
sscanf(theValue.GetUTF8(), "0X%llx", &valueInteger) == 1)
{
SetInt64(valueInteger);
return(true);
}
return(false);
}