From 0b01b7f7306beb5cf6d93d9f6dcfd7e00c508e01 Mon Sep 17 00:00:00 2001
From: pubpub-zz <4083478+pubpub-zz@users.noreply.github.com>
Date: Wed, 18 Jan 2023 23:06:16 +0100
Subject: [PATCH 1/4] remove erroneous assertion check

closes #1559
This is due to a bad interpretation of text at bottom of page 108 of pdf 1.7 reference
---
 pypdf/_reader.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pypdf/_reader.py b/pypdf/_reader.py
index 21520ed8f..0ac387b5d 100644
--- a/pypdf/_reader.py
+++ b/pypdf/_reader.py
@@ -1904,7 +1904,7 @@ def _read_xref_subsections(
         last_end = 0
         for start, size in self._pairs(idx_pairs):
             # The subsections must increase
-            assert start >= last_end
+            # assert start >= last_end
             last_end = start + size
             for num in range(start, start + size):
                 # The first entry is the type

From d39988acff000eae4baf94f36baa17ebd71ced59 Mon Sep 17 00:00:00 2001
From: pubpub-zz <4083478+pubpub-zz@users.noreply.github.com>
Date: Wed, 18 Jan 2023 23:11:12 +0100
Subject: [PATCH 2/4] flake8

---
 pypdf/_reader.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pypdf/_reader.py b/pypdf/_reader.py
index 0ac387b5d..4d8837aa6 100644
--- a/pypdf/_reader.py
+++ b/pypdf/_reader.py
@@ -1905,7 +1905,7 @@ def _read_xref_subsections(
         for start, size in self._pairs(idx_pairs):
             # The subsections must increase
             # assert start >= last_end
-            last_end = start + size
+            # last_end = start + size
             for num in range(start, start + size):
                 # The first entry is the type
                 xref_type = get_entry(0)

From b7f7a199910ae641a0cb1e59dfb52d69bd39ff04 Mon Sep 17 00:00:00 2001
From: pubpub-zz <4083478+pubpub-zz@users.noreply.github.com>
Date: Fri, 20 Jan 2023 18:21:22 +0100
Subject: [PATCH 3/4] flake8

---
 pypdf/_reader.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pypdf/_reader.py b/pypdf/_reader.py
index 4d8837aa6..4ec380b88 100644
--- a/pypdf/_reader.py
+++ b/pypdf/_reader.py
@@ -1901,7 +1901,7 @@ def _read_xref_subsections(
         get_entry: Callable[[int], Union[int, Tuple[int, ...]]],
         used_before: Callable[[int, Union[int, Tuple[int, ...]]], bool],
     ) -> None:
-        last_end = 0
+        # last_end = 0
         for start, size in self._pairs(idx_pairs):
             # The subsections must increase
             # assert start >= last_end

From 222a7820716c21f762f5a9a4a118409bfeff8c75 Mon Sep 17 00:00:00 2001
From: pubpub-zz <4083478+pubpub-zz@users.noreply.github.com>
Date: Fri, 20 Jan 2023 18:42:18 +0100
Subject: [PATCH 4/4] add test

---
 tests/test_reader.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tests/test_reader.py b/tests/test_reader.py
index 62eb7b7bd..81dee1f0e 100644
--- a/tests/test_reader.py
+++ b/tests/test_reader.py
@@ -1279,3 +1279,11 @@ def test_build_outline_item(caplog):
 def test_page_labels(src, page_labels):
     max_indices = 6
     assert PdfReader(src).page_labels[:max_indices] == page_labels[:max_indices]
+
+
+def test_iss1559():
+    url = "https://github.com/py-pdf/pypdf/files/10441992/default.pdf"
+    name = "iss1559.pdf"
+    reader = PdfReader(BytesIO(get_pdf_from_url(url, name=name)))
+    for p in reader.pages:
+        p.extract_text()