RVA to File Offset x86 PE windows

DWORD RVAtoFileOffset(PIMAGE_NT_HEADER pNTHeader, DWORD RVA) {

    PIMAGE_FILE_HEADER fileHeader = &(ntHeader->FileHeader);
    PIMAGE_OPTIONAL_HEADER optionalHeader = &(ntHeader->OptionalHeader);
    WORD sizeOfOptionalHeader = fileHeader->SizeOfOptionalHeader;

    WORD numberOfSections = fileHeader->NumberOfSections;

    PIMAGE_SECTION_HEADER firstSectionHeader;
    firstSectionHeader = (PIMAGE_SECTION_HEADER)(((PBYTE)optionalHeader) + sizeOfOptionalHeader);

    PIMAGE_SECTION_HEADER section = firstSectionHeader;
    for (int i = 0; i < numberOfSections; i++) {

        DWORD VirtualAddress = section->VirtualAddress;
        DWORD VirtualSize = section->Misc.VirtualSize;

        if (VirtualAddress <= RVA && RVA < VirtualAddress + VirtualSize) {
            // RVA is in this section.
            return (RVA - VirtualAddress) + section->PointerToRawData;
        }

        // next section...
        section = (PIMAGE_SECTION_HEADER)(((PBYTE)section) + sizeof(IMAGE_SECTION_HEADER) );
    }

    return 0;
}