Method read_db

ogsr_engine/xrCore/arc_db.cpp:117–158

}

IReader* CLocatorAPI::archive::read_db(const char* fname, const struct file& desc, u32 gran) const
{
    size_t start = (desc.ptr / gran) * gran;
    size_t end = (desc.ptr + desc.size_compressed) / gran;
    if ((desc.ptr + desc.size_compressed) % gran)
        end += 1;
    end *= gran;
    if (end > size)
        end = size;
    size_t sz = end - start;

    u8* ptr = (u8*)MapViewOfFile(hSrcMap, FILE_MAP_READ, 0, start, sz);
    if (!ptr)
    {
        VERIFY(ptr, "cannot create file mapping on file", fname);
        return nullptr;
    }

#ifdef DEBUG
    string512 temp;
    sprintf_s(temp, "%s:%s", *path, fname);

    register_file_mapping(ptr, sz, temp);
#endif // DEBUG

    size_t ptr_offs = desc.ptr - start;
    if (desc.size_real == desc.size_compressed)
        return xr_new<CPackReader>(ptr, ptr + ptr_offs, desc.size_real);

    // Compressed
    u8* dest = xr_alloc<u8>(desc.size_real);
    rtc_decompress(dest, desc.size_real, ptr + ptr_offs, desc.size_compressed);

    auto* R = xr_new<CTempReader>(dest, desc.size_real, 0);
    UnmapViewOfFile(ptr);

#ifdef DEBUG
    unregister_file_mapping(ptr, sz);
#endif // DEBUG

    return R;
}

CStreamReader* CLocatorAPI::archive::stream_db(const char* fname, const struct file& desc) const
{