From ae8ca3f4665088015eb790aaf25c64970c5f5dcf Mon Sep 17 00:00:00 2001
From: stefan6419846 <96178532+stefan6419846@users.noreply.github.com>
Date: Wed, 26 Feb 2025 11:39:51 +0100
Subject: [PATCH 1/2] BUG: Use the correct name StandardEncoding for the
 predefined cmap

---
 pypdf/_cmap.py            | 4 ++--
 pypdf/_codecs/__init__.py | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/pypdf/_cmap.py b/pypdf/_cmap.py
index de21b3429..f4b5e4b4c 100644
--- a/pypdf/_cmap.py
+++ b/pypdf/_cmap.py
@@ -177,9 +177,9 @@ def _parse_encoding(
                 f"Advanced encoding {encoding} not implemented yet",
                 __name__,
             )
-            encoding = charset_encoding["/StandardCoding"].copy()
+            encoding = charset_encoding["/StandardEncoding"].copy()
     else:
-        encoding = charset_encoding["/StandardCoding"].copy()
+        encoding = charset_encoding["/StandardEncoding"].copy()
     if "/Differences" in enc:
         x: int = 0
         o: Union[int, str]
diff --git a/pypdf/_codecs/__init__.py b/pypdf/_codecs/__init__.py
index 734c9ece1..540bcc4c3 100644
--- a/pypdf/_codecs/__init__.py
+++ b/pypdf/_codecs/__init__.py
@@ -40,7 +40,7 @@ def rev_encoding(enc: List[str]) -> Dict[str, int]:
 
 
 charset_encoding: Dict[str, List[str]] = {
-    "/StandardCoding": _std_encoding,
+    "/StandardEncoding": _std_encoding,
     "/WinAnsiEncoding": _win_encoding,
     "/MacRomanEncoding": _mac_encoding,
     "/PDFDocEncoding": _pdfdoc_encoding,

From 28844a347a891faa2579f75e44786444f9b03e9a Mon Sep 17 00:00:00 2001
From: stefan6419846 <96178532+stefan6419846@users.noreply.github.com>
Date: Wed, 26 Feb 2025 13:08:45 +0100
Subject: [PATCH 2/2] add test

---
 tests/test_cmap.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tests/test_cmap.py b/tests/test_cmap.py
index 3a2f39d26..94f4c5a8b 100644
--- a/tests/test_cmap.py
+++ b/tests/test_cmap.py
@@ -293,3 +293,15 @@ def test_binascii_odd_length_string(caplog):
     page = reader.pages[0]
     assert "\n(Many other theorems may\n" in page.extract_text()
     assert "Skipping broken line b'143f   143f   10300': Odd-length string\n" in caplog.text
+
+
+@pytest.mark.enable_socket
+def test_standard_encoding(caplog):
+    """Tests for #3156"""
+    url = "https://github.com/user-attachments/files/18983503/standard-encoding.pdf"
+    name = "issue3156.pdf"
+    reader = PdfReader(BytesIO(get_data_from_url(url, name=name)))
+
+    page = reader.pages[0]
+    assert page.extract_text() == "Lorem ipsum"
+    assert "Advanced encoding" not in caplog.text