fromPtr

        pub fn fromPtr(header: *elf.gnu_hash.Header) @This() {
            const header_offset = @intFromPtr(header);
            const bloom_offset = header_offset + @sizeOf(elf.gnu_hash.Header);
            const buckets_offset = bloom_offset + header.bloom_size * @sizeOf(u64);
            const chain_offset = buckets_offset + header.nbuckets * @sizeOf(u32);

            const bloom_ptr: [*]u64 = @ptrFromInt(bloom_offset);
            const buckets_ptr: [*]u32 = @ptrFromInt(buckets_offset);
            const chain_ptr: [*]elf.gnu_hash.ChainEntry = @ptrFromInt(chain_offset);

            return .{
                .symoffset = header.symoffset,
                .bloom_shift = header.bloom_shift,
                .bloom = bloom_ptr[0..header.bloom_size],
                .buckets = buckets_ptr[0..header.nbuckets],
                .chain = chain_ptr,
            };
        }