private static unsafe bool ProcessSection(LockdownSha1.Context context, LockdownHeap heap, byte *baseaddr, byte *preferredBaseAddr,
PeFileReader.ImageSectionHeader *section, int sectionAlignment, int seed)
{
int eax, virtualAddr, virtualSize, value;
int index, bytes;
int i;
using (HeapPtr hpLockdownMem = heap.ToPointer())
{
int * lockdown_memory = (int *)hpLockdownMem.ToPointer();
byte *allocatedMemoryBase;
int lowerOffset = (int)baseaddr - (int)preferredBaseAddr;
virtualAddr = section->VirtualAddress;
virtualSize = section->VirtualSize;
bytes = ((virtualSize + sectionAlignment - 1) & ~(sectionAlignment - 1)) - virtualSize;
if (section->Characteristics < 0)
{
LockdownSha1.Pad(context, bytes + virtualSize);
}
else
{
index = 0;
if (heap.CurrentLength > 0)
{
for (i = 0; index < heap.CurrentLength && lockdown_memory[i] < virtualAddr; i += 4)
{
index++;
}
}
if (virtualSize > 0)
{
byte *startingMemory = baseaddr + virtualAddr;
byte *ptrMemory = startingMemory;
int memoryOffset = index * 4;
do
{
int sectionLength = (int)(startingMemory - ptrMemory + virtualSize);
eax = 0;
if (index < heap.CurrentLength)
{
eax = (int)(lockdown_memory[memoryOffset] + startingMemory - virtualAddr);
}
if (eax != 0)
{
eax -= (int)ptrMemory;
if (eax < sectionLength)
{
sectionLength = eax;
}
}
if (sectionLength != 0)
{
LockdownSha1.Update(context, ptrMemory, sectionLength);
ptrMemory += sectionLength;
}
else
{
//int* heapBuffer = stackalloc int[0x10];
int *heapBuffer = (int *)Marshal.AllocHGlobal(0x10 * sizeof(int));
Native.Memcpy((void *)heapBuffer, lockdown_memory + memoryOffset, 0x10);
value = (*(int *)ptrMemory - lowerOffset) ^ seed;
LockdownSha1.Update(context, (byte *)&value, 4);
ptrMemory += heapBuffer[1];
index++;
memoryOffset += 4;
Marshal.FreeHGlobal((IntPtr)heapBuffer);
heapBuffer = null;
}
} while ((ptrMemory - startingMemory) < virtualSize);
}
if (bytes > 0)
{
int i2 = 0;
IntPtr memoryAllocation = Marshal.AllocHGlobal(bytes);
allocatedMemoryBase = (byte *)memoryAllocation.ToPointer();
Native.Memset(allocatedMemoryBase, 0, bytes);
do
{
eax = 0;
if (index < heap.CurrentLength)
{
value = *(int *)(((byte *)lockdown_memory) + (index * 16));
eax = (int)(value - virtualSize - virtualAddr + allocatedMemoryBase);
}
bytes += i2;
if (eax != 0)
{
eax -= ((int *)allocatedMemoryBase)[i2 / 4];
if (eax < bytes)
{
bytes = eax;
}
}
if (bytes != 0)
{
LockdownSha1.Update(context, &allocatedMemoryBase[i2], bytes);
i2 += bytes;
}
} while (i2 < bytes);
Marshal.FreeHGlobal(memoryAllocation);
}
}
}
return(true);
}
