-module(create_zlib_bomb).
-export([do_it/1]).

-define(CHUNK_SZ, (128 * (1 bsl 10))).

do_it(Size) ->
    Z = zlib:open(),
    zlib:deflateInit(Z, 9, deflated, 15, 9, default),
    Data = deflate_zeroes(Z, Size),
    zlib:deflateEnd(Z),
    iolist_to_binary(Data).

deflate_zeroes(Z, Size) ->
    Chunk = bin_zeroes(?CHUNK_SZ),
    deflate_zeroes(Z, Size, Chunk).

deflate_zeroes(Z, Size, Chunk) when Size >= byte_size(Chunk) ->
    zlib:deflate(Z, Chunk, none),
    deflate_zeroes(Z, Size - byte_size(Chunk), Chunk);
deflate_zeroes(Z, Size, _Chunk) ->
    TailChunk = bin_zeroes(Size),
    zlib:deflate(Z, TailChunk, finish).

bin_zeroes(Size) ->
    bin_zeroes(Size, []).

bin_zeroes(Size, Acc) when Size < 1 ->
    list_to_binary(Acc);
bin_zeroes(Size, Acc) ->
    bin_zeroes(Size - 1, [0 | Acc]).