private SectionHeader *FindSection(uint virtualAddress)
{
if (PEHeader->NumberOfSections == 0)
{
return(null);
}
//1. Find the greatest lower bound of virtualAddress in the section table.
var first = SectionTable;
var min = SectionTable;
var max = SectionTable + PEHeader->NumberOfSections - 1;
while (max >= first && max != min)
{
var mid = (((max - min) + 1) / 2) + min;
if (mid->VirtualAddress == virtualAddress)
{
return(mid);
}
if (virtualAddress < mid->VirtualAddress)
{
max = mid - 1;
}
else
{
virtualAddress.AssumeGT(mid->VirtualAddress);
min = mid;
}
}
if (max < first)
{
return(null);
}
//2. Verify that the virtual address fits within the found section
//(if we select the last section as the glb, the virtual address might be outside it).
try {
virtualAddress.AssumeGTE(min->VirtualAddress);
if (virtualAddress > checked (min->VirtualAddress + min->VirtualSize))
{
return(null);
}
}
catch (OverflowException) {
return(null);
}
return(min);
}