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// slang-fossil.cpp
#include "slang-fossil.h"
namespace Slang
{
namespace Fossil
{
const char Fossil::Header::kMagic[16] = {
'\xAB', // byte 0
'f', // byte 1
'o', // byte 2
's', // byte 3
's', // byte 4
'i', // byte 5
'l', // byte 6
' ', // byte 7
'1', // byte 8
'0', // byte 9
'0', // byte 10
'\xBB', // byte 11
'\r', // byte 12
'\n', // byte 13
'\x1A', // byte 14
'\n' // byte 15
};
Fossil::AnyValPtr getRootValue(ISlangBlob* blob)
{
return getRootValue(blob->getBufferPointer(), blob->getBufferSize());
}
Fossil::AnyValPtr getRootValue(void const* data, Size size)
{
if (!data)
{
SLANG_UNEXPECTED("bad format for fossil");
}
// There must be enough data to at least hold the header.
//
// (In practice there would need to be more data than
// just the header, but checking this invariant is a start).
//
if (size < sizeof(Fossil::Header))
{
SLANG_UNEXPECTED("bad format for fossil");
}
// Once we've checked that there's enough data, we can read
// the contents of the header.
//
auto header = reinterpret_cast<Fossil::Header const*>(data);
// The "magic" bytes at the start of the header must be
// what we expect (which is the contents of `Fossil::Header::kMagic`).
//
if (memcmp(header->magic, Fossil::Header::kMagic, sizeof(Fossil::Header::kMagic)) != 0)
{
SLANG_UNEXPECTED("bad format for fossil");
}
auto reportedSize = header->totalSizeIncludingHeader;
if (reportedSize > size)
{
SLANG_UNEXPECTED("bad format for fossil");
}
auto rootValueVariant = header->rootValue.get();
if (!rootValueVariant)
{
SLANG_UNEXPECTED("bad format for fossil");
}
return getVariantContentPtr(rootValueVariant);
}
} // namespace Fossil
Size FossilizedStringObj::getSize() const
{
auto sizePtr = (FossilUInt*)this - 1;
return Size(*sizePtr);
}
UnownedTerminatedStringSlice FossilizedStringObj::get() const
{
auto size = getSize();
return UnownedTerminatedStringSlice((char*)this, size);
}
Count FossilizedContainerObjBase::getElementCount() const
{
auto countPtr = (FossilUInt*)this - 1;
return Size(*countPtr);
}
FossilizedValLayout* FossilizedVariantObj::getContentLayout() const
{
auto layoutPtrPtr = (FossilizedPtr<FossilizedValLayout>*)this - 1;
return (*layoutPtrPtr).get();
}
Fossil::AnyValRef Fossil::ValRef<FossilizedContainerObjBase>::getElement(Index index) const
{
SLANG_ASSERT(index >= 0);
SLANG_ASSERT(index < getElementCount());
auto containerLayout = getLayout();
auto elementLayout = containerLayout->elementLayout.get();
auto elementStride = containerLayout->elementStride;
auto elementsPtr = (Byte*)getDataPtr();
auto elementPtr = (void*)(elementsPtr + elementStride * index);
return Fossil::AnyValRef(elementPtr, elementLayout);
}
FossilizedRecordElementLayout* FossilizedRecordLayout::getField(Index index) const
{
SLANG_ASSERT(index >= 0);
SLANG_ASSERT(index < fieldCount);
auto fieldsPtr = (FossilizedRecordElementLayout*)(this + 1);
return fieldsPtr + index;
}
Fossil::AnyValRef Fossil::ValRef<FossilizedRecordVal>::getField(Index index) const
{
SLANG_ASSERT(index >= 0);
SLANG_ASSERT(index < getFieldCount());
auto recordLayout = getLayout();
auto fieldInfo = recordLayout->getField(index);
auto fieldsPtr = (Byte*)getDataPtr();
auto fieldPtr = (void*)(fieldsPtr + fieldInfo->offset);
return Fossil::AnyValRef(fieldPtr, fieldInfo->layout);
}
#if 0
FossilizedValRef getVariantContent(FossilizedVariantObjRef variantRef)
{
return getVariantContent(variantRef.getData());
}
#endif
Fossil::AnyValPtr getVariantContentPtr(FossilizedVariantObj* variantPtr)
{
return Fossil::AnyValPtr(variantPtr->getContentDataPtr(), variantPtr->getContentLayout());
}
} // namespace Slang
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