From e00131824a10957973d724a5b2cf41b1ab598bf7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Wed, 22 Jan 2025 11:52:27 +0100
Subject: [PATCH] Use cow_deflate in cowboy_decompress_h

The function inflate/3 was moved there to make it
usable from within Cowlib itself.
---
 src/cowboy_decompress_h.erl | 22 ++--------------------
 1 file changed, 2 insertions(+), 20 deletions(-)

diff --git a/src/cowboy_decompress_h.erl b/src/cowboy_decompress_h.erl
index 4e86e230..5a6c302e 100644
--- a/src/cowboy_decompress_h.erl
+++ b/src/cowboy_decompress_h.erl
@@ -68,7 +68,8 @@ data(StreamID, IsFin, Data, State=#state{next=Next0, enabled=false, read_body_bu
 	fold(Commands, State#state{next=Next, read_body_is_fin=IsFin});
 data(StreamID, IsFin, Data, State0=#state{next=Next0, ratio_limit=RatioLimit,
 		inflate=Z, is_reading=true, read_body_buffer=Buffer}) ->
-	case inflate(Z, RatioLimit, buffer_to_iovec([Data|Buffer])) of
+	Limit = iolist_size(Data) * RatioLimit,
+	case cow_deflate:inflate(Z, buffer_to_iovec([Data|Buffer]), Limit) of
 		{error, ErrorType} ->
 			zlib:close(Z),
 			Status = case ErrorType of
@@ -236,22 +237,3 @@ do_build_accept_encoding([{ContentCoding, Q}|Tail], Acc0) ->
 	do_build_accept_encoding(Tail, Acc);
 do_build_accept_encoding([], Acc) ->
 	Acc.
-
-inflate(Z, RatioLimit, Data) ->
-	try
-		{Status, Output} = zlib:safeInflate(Z, Data),
-		Size = iolist_size(Output),
-		do_inflate(Z, Size, iolist_size(Data) * RatioLimit, 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))}.