From 8a9015bdd0e4d26c7c14b415895badd6607ed16b Mon Sep 17 00:00:00 2001
From: m-holger <m.holger@qpdf.org>
Date: Sun, 2 Nov 2025 13:08:26 +0000
Subject: [PATCH] Update `Stream::copy_data_to` to avoid unnecessary replacement filters and decode parameters with their existing values.

---
 libqpdf/QPDF_Stream.cc | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libqpdf/QPDF_Stream.cc b/libqpdf/QPDF_Stream.cc
index 0bd46c0..f77b6e3 100644
--- a/libqpdf/QPDF_Stream.cc
+++ b/libqpdf/QPDF_Stream.cc
@@ -311,9 +311,9 @@ Stream::copy_data_to(Stream& dest)
     if (qpdf()->doc().config().immediate_copy_from() && !s->stream_data) {
         // Pull the stream data into a buffer before attempting the copy operation. Do it on the
         // source stream so that if the source stream is copied multiple times, we don't have to
-        // keep duplicating the memory.
-        replaceStreamData(
-            getRawStreamData(), s->stream_dict["/Filter"], s->stream_dict["/DecodeParms"]);
+        // keep duplicating the memory. Passing uninitialised object handles will preserve the
+        // existing filters and decode parameters.
+        replaceStreamData(getRawStreamData(), {}, {});
     }
     if (s->stream_data) {
         dest.replaceStreamData(s->stream_data, dict["/Filter"], dict["/DecodeParms"]);
--
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