From 634d9249866de10ae60b7261fe03203fe6b04974 Mon Sep 17 00:00:00 2001
From: m-holger <m.holger@qpdf.org>
Date: Fri, 2 Aug 2024 19:23:17 +0100
Subject: [PATCH] In QPDFWriter::willFilterStream remember unfilterable streams

---
 libqpdf/QPDFWriter.cc | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index 39df8d2..2461386 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -1236,8 +1236,8 @@ QPDFWriter::writeTrailer(
 bool
 QPDFWriter::willFilterStream(
     QPDFObjectHandle stream,
-    bool& compress_stream,
-    bool& is_metadata,
+    bool& compress_stream, // out only
+    bool& is_metadata, // out only
     std::shared_ptr<Buffer>* stream_data)
 {
     compress_stream = false;
@@ -1299,9 +1299,10 @@ QPDFWriter::willFilterStream(
             throw std::runtime_error(
                 "error while getting stream data for " + stream.unparse() + ": " + e.what());
         }
-        if (filter && (!filtered)) {
+        if (filter && !filtered) {
             // Try again
             filter = false;
+            stream.setFilterOnWrite(false);
         } else {
             break;
         }
--
libgit2 0.21.4