From d2dee29c9e95daae2057addb52d80df47ea3f92d Mon Sep 17 00:00:00 2001
From: WMJ <wmj@live.cn>
Date: Mon, 2 Jun 2025 15:26:38 +0800
Subject: [PATCH] =?UTF-8?q?=EF=BC=8D=E4=BF=AE=E5=A4=8D=E5=A4=84=E7=90=86?=
 =?UTF-8?q?=E5=85=B1=E7=94=A8=20Root=20=E5=92=8C=20Info=20=E7=9A=84?=
 =?UTF-8?q?=E6=96=87=E6=A1=A3=E5=90=8E=EF=BC=8C=E5=AF=BC=E8=87=B4=E6=96=87?=
 =?UTF-8?q?=E6=A1=A3=E6=8D=9F=E5=9D=8F=E7=9A=84=E9=97=AE=E9=A2=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 App/Processor/PdfHelper.cs        | 15 +++++++++++++++
 App/Processor/PdfPageExtractor.cs | 13 ++-----------
 App/Processor/Worker.cs           |  1 +
 更新历史.txt                      |  1 +
 4 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/App/Processor/PdfHelper.cs b/App/Processor/PdfHelper.cs
index 82f69c5..692ddd8 100644
--- a/App/Processor/PdfHelper.cs
+++ b/App/Processor/PdfHelper.cs
@@ -90,6 +90,21 @@ namespace PDFPatcher.Processor
 			return r;
 		}
 
+		/// <summary>
+		/// 有些奇怪的 PDF 会让 Root 和 Info 共用一个对象，
+		/// 这将导致处理后的文档无法读取，应将其复制成副本，分别修改。
+		/// </summary>
+		internal static void SeparateConjoinedRootAndInfo(this PdfReader pdf) {
+			if (pdf.Catalog == pdf.Trailer.GetAsDict(PdfName.INFO)) {
+				var d = new PdfDictionary();
+				pdf.Trailer.Put(PdfName.INFO, d);
+				d.Merge(pdf.Catalog);
+				d.Put(PdfName.TYPE, PdfName.INFO);
+				d.Remove(PdfName.PAGES);
+				d.Remove(PdfName.OUTLINES);
+			}
+		}
+
 		internal static MuPDF.Document OpenMuDocument(string sourceFile) {
 			var d = MuPDF.Context.Instance.OpenDocument(sourceFile);
 			if (d.NeedsPassword) {
diff --git a/App/Processor/PdfPageExtractor.cs b/App/Processor/PdfPageExtractor.cs
index bf65e8d..34a2fcf 100644
--- a/App/Processor/PdfPageExtractor.cs
+++ b/App/Processor/PdfPageExtractor.cs
@@ -197,8 +197,8 @@ namespace PDFPatcher.Processor
 					pdf.Trailer.Remove(PdfName.INFO);
 					pdf.Catalog.Remove(PdfName.METADATA);
 				}
-				else if (pdf.Catalog == pdf.Trailer.GetAsDict(PdfName.INFO)) {
-					FixIncorrectTrailerInfo(pdf);
+				else {
+					pdf.SeparateConjoinedRootAndInfo();
 				}
 				if (options.EnableFullCompression) {
 					pdf.RemoveUnusedObjects();
@@ -215,15 +215,6 @@ namespace PDFPatcher.Processor
 			Tracker.TraceMessage(Tracker.Category.Alert, $"成功提取文件内容到 <<{targetFile}>>。");
 		}
 
-		static void FixIncorrectTrailerInfo(PdfReader pdf) {
-			var d = new PdfDictionary();
-			pdf.Trailer.Put(PdfName.INFO, d);
-			d.Merge(pdf.Catalog);
-			d.Put(PdfName.TYPE, PdfName.INFO);
-			d.Remove(PdfName.PAGES);
-			d.Remove(PdfName.OUTLINES);
-		}
-
 		static string RewriteTargetFileName(string sourceFile, string targetFile, PdfReader pdf) {
 			DocInfoExporter.RewriteDocInfoWithEncoding(pdf, AppContext.Encodings.DocInfoEncoding);
 			targetFile = Worker.ReplaceTargetFileNameMacros(sourceFile, targetFile, pdf);
diff --git a/App/Processor/Worker.cs b/App/Processor/Worker.cs
index e57c9ae..c339150 100644
--- a/App/Processor/Worker.cs
+++ b/App/Processor/Worker.cs
@@ -350,6 +350,7 @@ namespace PDFPatcher.Processor
 			if (pdf == null) {
 				return false;
 			}
+			pdf.SeparateConjoinedRootAndInfo();
 			try {
 				DocInfoImporter import;
 				var xInfoDoc = infoDoc as PdfInfoXmlDocument;
diff --git a/更新历史.txt b/更新历史.txt
index b01db21..a6aa190 100644
--- a/更新历史.txt
+++ b/更新历史.txt
@@ -23,6 +23,7 @@
 	自动生成书签功能可能生成空白的书签。
 	自动生成书签列表框导入之前保存的条件后，插入新书签将清空规则列表。
 	列出系统安装字体时，对于异常的字体不要抛出异常。
+	处理共用 Root 和 Info 的文档后，导致文档损坏。
 
 1.0.4.4512 2024年9月30日
 新增功能：