Method MmapMemorySource

src/io/mmap_memory_source.cpp:33–68

class MmapMemorySource : public MemorySource {
public:
    explicit MmapMemorySource(const std::filesystem::path& p) : name_(p.string()) {
        file_ = CreateFileW(p.wstring().c_str(),
                            GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
                            nullptr, OPEN_EXISTING,
                            FILE_ATTRIBUTE_NORMAL | FILE_FLAG_SEQUENTIAL_SCAN,
                            nullptr);
        if (file_ == INVALID_HANDLE_VALUE)
            throw_error("MmapMemorySource: CreateFile failed on '{}'", name_);

        LARGE_INTEGER sz{};
        if (!GetFileSizeEx(file_, &sz)) {
            CloseHandle(file_);
            throw_error("MmapMemorySource: GetFileSizeEx failed");
        }
        size_ = static_cast<u64>(sz.QuadPart);
        if (size_ == 0) {
            CloseHandle(file_);
            throw_error("MmapMemorySource: zero-byte file '{}'", name_);
        }

        mapping_ = CreateFileMappingW(file_, nullptr, PAGE_READONLY, 0, 0, nullptr);
        if (!mapping_) {
            CloseHandle(file_);
            throw_error("MmapMemorySource: CreateFileMapping failed (size={})", size_);
        }

        view_ = MapViewOfFile(mapping_, FILE_MAP_READ, 0, 0, 0);
        if (!view_) {
            CloseHandle(mapping_);
            CloseHandle(file_);
            throw_error("MmapMemorySource: MapViewOfFile failed (size={})", size_);
        }

        log::info("Mapped '{}' ({} bytes) into process address space at {}",
                  name_, size_, view_);
    }

    ~MmapMemorySource() override {
        if (view_)    UnmapViewOfFile(view_);