diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/cow_deflate.erl | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/cow_deflate.erl b/src/cow_deflate.erl new file mode 100644 index 0000000..051c8e4 --- /dev/null +++ b/src/cow_deflate.erl @@ -0,0 +1,39 @@ +%% Copyright (c) 2024-2025, jdamanalo <[email protected]> +%% Copyright (c) 2024-2025, Loïc Hoguin <[email protected]> +%% +%% Permission to use, copy, modify, and/or distribute this software for any +%% purpose with or without fee is hereby granted, provided that the above +%% copyright notice and this permission notice appear in all copies. +%% +%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES +%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF +%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR +%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES +%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN +%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF +%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + +-module(cow_deflate). + +-export([inflate/3]). + +-spec inflate(zlib:zstream(), iodata(), non_neg_integer() | infinity) + -> {ok, binary()} | {error, data_error | size_error}. + +inflate(Z, Data, Limit) -> + try + {Status, Output} = zlib:safeInflate(Z, Data), + do_inflate(Z, iolist_size(Output), Limit, Status, [Output]) + catch + error:data_error -> + {error, data_error} + end. + +do_inflate(_, Size, Limit, _, _) when Size > Limit -> + {error, size_error}; +do_inflate(Z, Size0, Limit, continue, Acc) -> + {Status, Output} = zlib:safeInflate(Z, []), + Size = Size0 + iolist_size(Output), + do_inflate(Z, Size, Limit, Status, [Output | Acc]); +do_inflate(_, _, _, finished, Acc) -> + {ok, iolist_to_binary(lists:reverse(Acc))}. |