From e8290caf23a06ac8d9e40764b5eb9e69bfb792aa Mon Sep 17 00:00:00 2001
From: airmang <38392618+airmang@users.noreply.github.com>
Date: Fri, 16 Oct 2026 14:28:23 +0900
Subject: [PATCH 1/2] fix(layout): read a column gap as a signed 32-bit number

The page estimate reads hp:colPr@sameGap as a signed 32-bit number: a value of 2**31 or more is a negative gap, and Hancom Office widens the columns by it so that they overlap. Before, such a gap was read as a huge one, leaving the columns next to no width. The columns_gap_wrapped fixture is re-saved by Hancom Office 2024.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 CHANGELOG.md                                  |   2 ++
 src/hwpx/layout/pages.py                      |   2 ++
 .../hancom_saved/columns_gap_wrapped.hwpx     | Bin 8317 -> 22614 bytes
 tests/test_layout_page_estimate.py            |   3 +++
 4 files changed, 7 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 70a51509..8b0f5157 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -99,6 +99,8 @@
   - 탭 정의에 자기 탭 위치나 자동 탭이 있는 문단은 전처럼 잰다.
 - 쪽 수 추정에서 강제 줄 바꿈 다음 줄은 첫 줄이 아니다. 들여쓰기를 빼지 않고 다른 줄의 폭으로 잰다. 전에는 첫 줄 폭으로
   재서, 들여쓴 문단에서 줄이 하나 더 생길 수 있었다.
+- 쪽 수 추정이 단 간격(`hp:colPr@sameGap`)을 부호 있는 32비트 수로 읽는다. 2³¹ 이상으로 쓰인 값은 음수 간격이고, 한/글은
+  단이 겹치도록 단 폭을 그만큼 넓힌다. 전에는 아주 큰 간격으로 읽어 단 폭이 거의 없었다.
 - `.hwp`를 열 때 그림의 투명도와 반전을 한/글이 읽는 자리에서 읽는다. 한/글은 그림 레코드의 투명도를 그림 원래 크기
   뒤 마지막 바이트에서 읽고, 바이너리 항목 번호 뒤 바이트는 읽지 않는다(저장할 때 0으로 쓴다). 전에는 그 바이트를
   투명도로 옮겨, 거기에 255가 든 문서의 그림이 HWPX에서 보이지 않았다. 반전(`hp:pic@reverse`)은 그림 개체 속성의
diff --git a/src/hwpx/layout/pages.py b/src/hwpx/layout/pages.py
index 63844fe3..5f69d08e 100644
--- a/src/hwpx/layout/pages.py
+++ b/src/hwpx/layout/pages.py
@@ -1442,6 +1442,8 @@ def _column_layout(settings: Any, text_width: int) -> tuple[int, int, tuple[int,
                        for size in sizes)
         return count, min(widths), widths, 0
     gap = int(settings.get("sameGap", 0))
+    if gap >= 1 << 31:  # a signed 32-bit number written unsigned: Hancom takes a negative gap so
+        gap -= 1 << 32
     return count, (text_width - (count - 1) * gap) // count // 4 * 4, (), gap
 
 
diff --git a/tests/fixtures/hancom_saved/columns_gap_wrapped.hwpx b/tests/fixtures/hancom_saved/columns_gap_wrapped.hwpx
index c54b86c642160af798d336cd5f398e947aea23d6..b5965ffac96f05c18b8939a315ae0fb7d871ab52 100644
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diff --git a/tests/test_layout_page_estimate.py b/tests/test_layout_page_estimate.py
index f3ac879d..b50e8c32 100644
--- a/tests/test_layout_page_estimate.py
+++ b/tests/test_layout_page_estimate.py
@@ -23,6 +23,9 @@
 HH = "{http://www.hancom.co.kr/hwpml/2011/head}"
 FIXTURES = Path(__file__).parent / "fixtures" / "hancom_saved"
 HANCOM_PAGES = {
+    # Two columns whose gap is written 2**32 - 2**15: a signed 32-bit number, -32768, so the columns overlap and
+    # each is (42520 + 32768) / 2 wide, as Hancom lays them out.
+    "columns_gap_wrapped": 1,
     # A picture (or a rectangle) placed top and bottom alone in an empty paragraph whose spacing after is 1000,
     # the next paragraph's spacing before 600, the empty line 1600 tall with its spacing: unless the object
     # moves with the text, may overlap and starts above the line's foot, the empty line stays at the paragraph's

From 52c2ad0d24c6bdb2d14bb80bb5dfed93acc1285b Mon Sep 17 00:00:00 2001
From: airmang <38392618+airmang@users.noreply.github.com>
Date: Fri, 16 Oct 2026 22:37:28 +0900
Subject: [PATCH 2/2] Keep independent review additions at distinct changelog
 and test locations

---
 CHANGELOG.md                       | 4 ++--
 tests/test_layout_page_estimate.py | 6 +++---
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 657f1089..36575785 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -107,8 +107,6 @@
     않으면 탭은 폭이 없다. 내어쓰기 자동 탭은 둘째 줄이 시작하는 곳에 왼쪽 위치를 둔다.
 - 쪽 수 추정에서 강제 줄 바꿈 다음 줄은 첫 줄이 아니다. 들여쓰기를 빼지 않고 다른 줄의 폭으로 잰다. 전에는 첫 줄 폭으로
   재서, 들여쓴 문단에서 줄이 하나 더 생길 수 있었다.
-- 쪽 수 추정이 단 간격(`hp:colPr@sameGap`)을 부호 있는 32비트 수로 읽는다. 2³¹ 이상으로 쓰인 값은 음수 간격이고, 한/글은
-  단이 겹치도록 단 폭을 그만큼 넓힌다. 전에는 아주 큰 간격으로 읽어 단 폭이 거의 없었다.
 - FormFit과 쪽 수 추정이 텍스트 내보내기가 쓰지 않는 번호 형식(`KOREAN_DIGIT`, `HANGUL` 등)의 문단 번호를 만나도
   멈추지 않는다. 한/글이 재는 번호(`useInstWidth`)이면 그 숫자를 한글 한 글자 폭으로 잰다. 전에는 번호가 자기 글자
   모양을 가진 문단에서 `KeyError`가 났다.
@@ -146,6 +144,8 @@
   다음 줄이 쪽 끝을 넘으면 다음 쪽 맨 위에서 시작한다(개체 아래 간격은 그 쪽으로 가져가지 않는다). 개체의 앵커 줄이
   다음 쪽으로 넘어가면 개체도 그 줄과 함께 넘어가, 그 줄 위에서 오프셋만큼 아래에 선다. 전에는 앞의 경우를 지원하지
   않았고, 뒤의 경우 개체를 다음 쪽 맨 위에, 앵커 줄을 그 아래에 놓았다.
+- 쪽 수 추정이 단 간격(`hp:colPr@sameGap`)을 부호 있는 32비트 수로 읽는다. 2³¹ 이상으로 쓰인 값은 음수 간격이고, 한/글은
+  단이 겹치도록 단 폭을 그만큼 넓힌다. 전에는 아주 큰 간격으로 읽어 단 폭이 거의 없었다.
 - 쪽 수 추정이 빈 문단에 홀로 든 위아래 배치 개체(그림·도형) 뒤의 다음 문단을 한/글처럼 놓는다. 개체가
   글과 함께 움직이고 겹침을 허용하며 빈 줄의 글자 높이 안에서 시작할 때만 빈 줄이 개체 아래로 내려간다.
   그 밖에는 빈 줄이 문단 위에 그대로 있고, 다음 문단은 개체의 아래끝과 빈 줄에 두 문단 간격(앞 문단 아래·다음
diff --git a/tests/test_layout_page_estimate.py b/tests/test_layout_page_estimate.py
index 42a7fa7a..d623bc26 100644
--- a/tests/test_layout_page_estimate.py
+++ b/tests/test_layout_page_estimate.py
@@ -23,9 +23,6 @@
 HH = "{http://www.hancom.co.kr/hwpml/2011/head}"
 FIXTURES = Path(__file__).parent / "fixtures" / "hancom_saved"
 HANCOM_PAGES = {
-    # Two columns whose gap is written 2**32 - 2**15: a signed 32-bit number, -32768, so the columns overlap and
-    # each is (42520 + 32768) / 2 wide, as Hancom lays them out.
-    "columns_gap_wrapped": 1,
     # A picture (or a rectangle) placed top and bottom alone in an empty paragraph whose spacing after is 1000,
     # the next paragraph's spacing before 600, the empty line 1600 tall with its spacing: unless the object
     # moves with the text, may overlap and starts above the line's foot, the empty line stays at the paragraph's
@@ -243,6 +240,9 @@
     "pages_line_ends_1_above_page_foot": 2,    # and one ending 1 above it
     "pages_line_ends_100_above_page_foot": 2,  # and 100 above it: no room is kept below lines
     "pages_keep_keep_with_next": 3,       # keep with next
+    # Two columns whose gap is written 2**32 - 2**15: a signed 32-bit number, -32768, so the columns overlap and
+    # each is (42520 + 32768) / 2 wide, as Hancom lays them out.
+    "columns_gap_wrapped": 1,
     "pages_columns_2_break": 4,           # two columns and a column break
     # Columns changing inside the section (10 pt lines spaced 160%): three lines in one column, a paragraph
     # starting two columns (gap 1200) and the lines after it, then one starting one column and three lines.