From 27c7ccc10dc024c7cbad756606ba6d3d7ff77eca Mon Sep 17 00:00:00 2001
From: HapeLee <63206378+HapeLee@users.noreply.github.com>
Date: Mon, 11 May 2026 01:08:52 +0800
Subject: [PATCH] =?UTF-8?q?=E7=BC=96=E8=BE=91=E6=9C=AC=E5=9C=B0=E4=B9=A6?=
 =?UTF-8?q?=E7=B1=8D=E6=97=B6=EF=BC=8C=E9=94=99=E8=AF=AF=E5=88=A0=E9=99=A4?=
 =?UTF-8?q?=E6=8D=A2=E8=A1=8C=E7=AC=A6=E7=9A=84=E9=97=AE=E9=A2=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/io/legado/app/help/book/BookHelp.kt  | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/app/src/main/java/io/legado/app/help/book/BookHelp.kt b/app/src/main/java/io/legado/app/help/book/BookHelp.kt
index 18562a43d..9d79cfd18 100644
--- a/app/src/main/java/io/legado/app/help/book/BookHelp.kt
+++ b/app/src/main/java/io/legado/app/help/book/BookHelp.kt
@@ -215,10 +215,6 @@ object BookHelp {
         val uri = book.getLocalUri()
         val charset = book.fileCharset()
         val oldTitle = bookChapter.title
-        val newContent = oldTitle + "\n" + content
-        val newBytes = newContent.toByteArray(charset)
-        val oldLength = end - start
-        val diff = newBytes.size - oldLength
 
         val pfd = if (uri.isContentScheme()) {
             appCtx.contentResolver.openFileDescriptor(uri, "rw")
@@ -231,6 +227,21 @@ object BookHelp {
             try {
                 val totalLength = Os.fstat(fd).st_size
 
+                // 尝试保留章节末尾的换行符
+                val oldLength = end - start
+                val readLen = if (oldLength > 32) 32 else oldLength.toInt()
+                var gap = ""
+                if (readLen > 0) {
+                    val lastBytes = ByteArray(readLen)
+                    Os.pread(fd, lastBytes, 0, readLen, end - readLen)
+                    val lastString = String(lastBytes, charset)
+                    gap = lastString.takeLastWhile { c -> c == '\n' || c == '\r' }
+                }
+
+                val newContent = oldTitle + "\n" + content + gap
+                val newBytes = newContent.toByteArray(charset)
+                val diff = newBytes.size - oldLength
+
                 if (diff != 0L) {
                     val remaining = totalLength - end
                     if (remaining > 0) {