From ad4f13d17412f529f3f595c5c295c31788110931 Mon Sep 17 00:00:00 2001
From: pubpub-zz <4083478+pubpub-zz@users.noreply.github.com>
Date: Fri, 8 Sep 2023 13:39:01 +0200
Subject: [PATCH] BUG: Accept tabs in cmaps (#2174)

Closes #2173
---
 pypdf/_cmap.py     | 5 +++--
 tests/test_cmap.py | 9 +++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/pypdf/_cmap.py b/pypdf/_cmap.py
index 369ab1904..b09119d3d 100644
--- a/pypdf/_cmap.py
+++ b/pypdf/_cmap.py
@@ -232,7 +232,7 @@ def parse_to_unicode(
     cm = prepare_cm(ft)
     for line in cm.split(b"\n"):
         process_rg, process_char, multiline_rg = process_cm_line(
-            line.strip(b" "),
+            line.strip(b" \t"),
             process_rg,
             process_char,
             multiline_rg,
@@ -295,8 +295,9 @@ def process_cm_line(
     map_dict: Dict[Any, Any],
     int_entry: List[int],
 ) -> Tuple[bool, bool, Union[None, Tuple[int, int]]]:
-    if line in (b"", b" ") or line[0] == 37:  # 37 = %
+    if line == b"" or line[0] == 37:  # 37 = %
         return process_rg, process_char, multiline_rg
+    line = line.replace(b"\t", b" ")
     if b"beginbfrange" in line:
         process_rg = True
     elif b"endbfrange" in line:
diff --git a/tests/test_cmap.py b/tests/test_cmap.py
index fe769e1c5..262869c94 100644
--- a/tests/test_cmap.py
+++ b/tests/test_cmap.py
@@ -189,3 +189,12 @@ def test_unixxx_glyphs():
     txt = reader.pages[0].extract_text()  # no error
     for pat in ("闫耀庭", "龚龑", "张江水", "1′′.2"):
         assert pat in txt
+
+
+@pytest.mark.enable_socket()
+def test_tabs_in_cmap():
+    """Issue #2173"""
+    url = "https://github.com/py-pdf/pypdf/files/12552700/tt.pdf"
+    name = "iss2173.pdf"
+    reader = PdfReader(BytesIO(get_data_from_url(url, name=name)))
+    reader.pages[0].extract_text()