From d4da3b42779dd14c33fc9a6d71ea438a6373d6d4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E8=88=AA=E5=AE=87?= <3364451258@qq.com>
Date: Wed, 17 Jun 2026 09:06:18 +0800
Subject: [PATCH] =?UTF-8?q?fix:=20placement.rs=20=E2=80=94=20actual=5Fcol?=
 =?UTF-8?q?=3D=3D0=20=E6=97=B6=E4=B8=8B=E6=BA=A2=E4=BF=9D=E6=8A=A4?=
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---
 core/src/matrix/placement.rs | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/core/src/matrix/placement.rs b/core/src/matrix/placement.rs
index afc1b74..f26369c 100644
--- a/core/src/matrix/placement.rs
+++ b/core/src/matrix/placement.rs
@@ -34,13 +34,15 @@ pub fn place_data(matrix: &mut Matrix, codewords: &[u8]) {
                 if bit_idx >= bits.len() {
                     break;
                 }
-                place_bit(
-                    matrix,
-                    (actual_col - 1) as u8,
-                    row as u8,
-                    bits[bit_idx],
-                    &mut bit_idx,
-                );
+                if actual_col > 0 {
+                    place_bit(
+                        matrix,
+                        (actual_col - 1) as u8,
+                        row as u8,
+                        bits[bit_idx],
+                        &mut bit_idx,
+                    );
+                }
             }
         } else {
             for row in 0..size {
@@ -57,13 +59,15 @@ pub fn place_data(matrix: &mut Matrix, codewords: &[u8]) {
                 if bit_idx >= bits.len() {
                     break;
                 }
-                place_bit(
-                    matrix,
-                    (actual_col - 1) as u8,
-                    row as u8,
-                    bits[bit_idx],
-                    &mut bit_idx,
-                );
+                if actual_col > 0 {
+                    place_bit(
+                        matrix,
+                        (actual_col - 1) as u8,
+                        row as u8,
+                        bits[bit_idx],
+                        &mut bit_idx,
+                    );
+                }
             }
         }