0001-pdftopdf-add-newline-to-avoid-mangling.patch

From 7992eb7c6e4abeffd766f54c98cbb2cbb45c5c04 Mon Sep 17 00:00:00 2001
From: Sergio <Sergio.G.delReal@gmail.com>
Date: Thu, 12 Sep 2024 15:18:53 -0500
Subject: [PATCH] pdftopdf: Add newline after each content stream in
 ::provideStreamData (#587)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When concatenating the data streams for the page's contents, add a new
line at the end of each data stream to avoid cases where the
concatenation might result in a corruption.
Eg (extracted from a real pdf):

        %% Contents for page 1
        %% Stream 1
        9 0 obj
        <<
          /Length 10 0 R
        >>
        stream
        q
        endstream
        endobj

        10 0 obj
        1
        endobj

        %% Stream 2
        11 0 obj
        <<
          /Length 12 0 R
        >>
        stream
        q 0.1 0 0 0.1 0 0 cm

the output pdf results in
        qq 0.1 0 0 0.1 0 0 cm

with the effect that 'qq' is not being parsed correctly, effectively
mangling the contents.

Signed-off-by: Sergio Gómez <sergio.g.delreal@gmail.com>
---
 filter/pdftopdf/qpdf_xobject.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/filter/pdftopdf/qpdf_xobject.cc b/filter/pdftopdf/qpdf_xobject.cc
index cc33f43a5..12732f1e9 100644
--- a/filter/pdftopdf/qpdf_xobject.cc
+++ b/filter/pdftopdf/qpdf_xobject.cc
@@ -29,8 +29,10 @@ void CombineFromContents_Provider::provideStreamData(int objid, int generation,
 {
   Pl_Concatenate concat("concat", pipeline);
   const int clen=contents.size();
-  for (int iA=0;iA<clen;iA++) {
+  for (int iA=0;iA<clen;iA++)
+  {
     contents[iA].pipeStreamData(&concat, true, false, false);
+    concat << "\n";
   }
   concat.manualFinish();
 }