From 5754ab8b39646404801931ed065f985efa0b34a7 Mon Sep 17 00:00:00 2001
From: m-holger <m-holger@kubitscheck.org>
Date: Sat, 8 Jul 2023 14:04:10 +0100
Subject: Tune QPDF::readObjectInStream

---
 include/qpdf/QPDF.hh |  2 +-
 libqpdf/QPDF.cc      | 14 +++++++-------
 2 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/include/qpdf/QPDF.hh b/include/qpdf/QPDF.hh
index 61510c17..2ee2bb34 100644
--- a/include/qpdf/QPDF.hh
+++ b/include/qpdf/QPDF.hh
@@ -1010,7 +1010,7 @@ class QPDF
     QPDFObjectHandle readObject(std::string const& description, QPDFObjGen og);
     void readStream(QPDFObjectHandle& object, QPDFObjGen og, qpdf_offset_t offset);
     void validateStreamLineEnd(QPDFObjectHandle& object, QPDFObjGen og, qpdf_offset_t offset);
-    QPDFObjectHandle readObjectInStream(std::shared_ptr<InputSource>, QPDFObjGen og);
+    QPDFObjectHandle readObjectInStream(std::shared_ptr<InputSource>& input, int obj);
     size_t recoverStreamLength(
         std::shared_ptr<InputSource> input, QPDFObjGen const& og, qpdf_offset_t stream_offset);
     QPDFTokenizer::Token readToken(std::shared_ptr<InputSource>, size_t max_len = 0);
diff --git a/libqpdf/QPDF.cc b/libqpdf/QPDF.cc
index 05929764..8a6a346e 100644
--- a/libqpdf/QPDF.cc
+++ b/libqpdf/QPDF.cc
@@ -1413,10 +1413,11 @@ QPDF::validateStreamLineEnd(QPDFObjectHandle& object, QPDFObjGen og, qpdf_offset
 }
 
 QPDFObjectHandle
-QPDF::readObjectInStream(std::shared_ptr<InputSource> input, QPDFObjGen og)
+QPDF::readObjectInStream(std::shared_ptr<InputSource>& input, int obj)
 {
-    setLastObjectDescription("", og);
-    qpdf_offset_t offset = input->tell();
+    m->last_object_description.erase(7); // last_object_description starts with "object "
+    m->last_object_description += std::to_string(obj);
+    m->last_object_description += " 0";
 
     bool empty = false;
     auto object = QPDFParser(input, m->last_object_description, m->tokenizer, nullptr, this)
@@ -1426,9 +1427,6 @@ QPDF::readObjectInStream(std::shared_ptr<InputSource> input, QPDFObjGen og)
         // actual PDF files and Adobe Reader appears to ignore them.
         warn(damagedPDF(input, input->getLastOffset(), "empty object treated as null"));
     }
-
-    // Override last_offset so that it points to the beginning of the object we just read
-    input->setLastOffset(offset);
     return object;
 }
 
@@ -1787,13 +1785,15 @@ QPDF::resolveObjectsInStream(int obj_stream_number)
     // found here in the cache.  Remember that some objects stored here might have been overridden
     // by new objects appended to the file, so it is necessary to recheck the xref table and only
     // cache what would actually be resolved here.
+    m->last_object_description.clear();
+    m->last_object_description += "object ";
     for (auto const& iter: offsets) {
         QPDFObjGen og(iter.first, 0);
         QPDFXRefEntry const& entry = m->xref_table[og];
         if ((entry.getType() == 2) && (entry.getObjStreamNumber() == obj_stream_number)) {
             int offset = iter.second;
             input->seek(offset, SEEK_SET);
-            QPDFObjectHandle oh = readObjectInStream(input, og);
+            QPDFObjectHandle oh = readObjectInStream(input, iter.first);
             updateCache(og, oh.getObj(), end_before_space, end_after_space);
         } else {
             QTC::TC("qpdf", "QPDF not caching overridden objstm object");
-- 
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