protected virtual void Dispose()
{
if (_dataHandle.IsAllocated)
{
_dataHandle.Free();
}
if (_initialized)
{
_dllEntry?.Invoke(_codeBase, DllReason.DLL_PROCESS_DETACH, null);
_initialized = false;
}
if (_modules.Count > 0)
{
foreach (HCoustomMudule module in _modules)
{
if (!InvalidHandle(module)) // INVALID_HANDLE
{
Win.FreeLibrary(module);
}
}
}
if (_codeBase != null)
{
Win.VirtualFree(_codeBase, 0, AllocationType.RELEASE);
}
Disposed = true;
}
private void FinalizeSection(SectionFinalizeData sectionData)
{
uint protect, oldProtect;
int executable;
int readable;
int writeable;
if (sectionData.Size == 0)
{
return;
}
if ((sectionData.Characteristics & Win.IMAGE_SCN_MEM_DISCARDABLE) > 0)
{
// section is not needed any more and can safely be freed
if (sectionData.Address == sectionData.AlignedAddress &&
(sectionData.Last ||
_headers->OptionalHeader.SectionAlignment == _pageSize ||
(sectionData.Size % _pageSize) == 0)
)
{
// Only allowed to decommit whole pages
Win.VirtualFree(sectionData.Address, sectionData.Size, AllocationType.DECOMMIT);
}
return;
}
// determine protection flags based on characteristics
executable = (sectionData.Characteristics & (uint)ImageSectionFlags.IMAGE_SCN_MEM_EXECUTE) != 0 ? 1 : 0;
readable = (sectionData.Characteristics & (uint)ImageSectionFlags.IMAGE_SCN_MEM_READ) != 0 ? 1 : 0;
writeable = (sectionData.Characteristics & (uint)ImageSectionFlags.IMAGE_SCN_MEM_WRITE) != 0 ? 1 : 0;
protect = (uint)ProtectionFlags[executable, readable, writeable];
if ((sectionData.Characteristics & Win.IMAGE_SCN_MEM_NOT_CACHED) > 0)
{
protect |= Win.PAGE_NOCACHE;
}
// change memory access flags
if (!Win.VirtualProtect(sectionData.Address, sectionData.Size, protect, out oldProtect))
{
throw new NativeDllLoadException("Error protecting memory page");
}
}