From 516c6b9aceb43782a35b3f68010eff44bad39ec8 Mon Sep 17 00:00:00 2001
From: Michael R Sweet <michael.r.sweet@gmail.com>
Date: Tue, 4 May 2021 12:24:29 -0400
Subject: [PATCH] Load trailer dict.

---
 pdfio-file.c                    | 41 ++++++++++++++++++++++++++++-----
 pdfio-private.h                 |  2 ++
 pdfio.xcodeproj/project.pbxproj | 29 +++++++++++++++++++++++
 3 files changed, 66 insertions(+), 6 deletions(-)

diff --git a/pdfio-file.c b/pdfio-file.c
index 5f1273b..373cfc4 100644
--- a/pdfio-file.c
+++ b/pdfio-file.c
@@ -453,9 +453,10 @@ static bool				// O - `true` on success, `false` on failure
 load_xref(pdfio_file_t *pdf,		// I - PDF file
           off_t        xref_offset)	// I - Offset to xref
 {
-  bool	done = false;			// Are we done?
-  char	line[1024],			// Line from file
-	*ptr;				// Pointer into line
+  bool		done = false;		// Are we done?
+  char		line[1024],		// Line from file
+		*ptr;			// Pointer into line
+  _pdfio_value_t trailer;		// Trailer dictionary
 
 
   while (!done)
@@ -496,7 +497,7 @@ load_xref(pdfio_file_t *pdf,		// I - PDF file
       // Read this group of objects...
       for (; num_objects > 0; num_objects --, number ++)
       {
-	intmax_t		offset;		// Offset in file
+	intmax_t	offset;		// Offset in file
 	int		generation;	// Generation number
 	pdfio_obj_t	*obj;		// Object
 
@@ -558,8 +559,36 @@ load_xref(pdfio_file_t *pdf,		// I - PDF file
       return (false);
     }
 
-    // TODO: Read trailer dict...
-    done = true;
+    if (!_pdfioValueRead(pdf, &trailer))
+    {
+      _pdfioFileError(pdf, "Unable to read trailer dictionary.");
+      return (false);
+    }
+    else
+    {
+      _pdfioFileError(pdf, "Trailer is not a dictionary.");
+      return (false);
+    }
+
+    if (!pdf->trailer)
+    {
+      // Save the trailer dictionary and grab the root (catalog) and info
+      // objects...
+      pdf->trailer = trailer.value.dict;
+
+      if ((pdf->root = pdfioDictGetObject(pdf->trailer, "Root")) == NULL)
+      {
+        _pdfioFileError(pdf, "Missing Root object.");
+        return (false);
+      }
+
+      pdf->info     = pdfioDictGetObject(pdf->trailer, "Info");
+      pdf->encrypt  = pdfioDictGetObject(pdf->trailer, "Encrypt");
+      pdf->id_array = pdfioDictGetArray(pdf->trailer, "ID");
+    }
+
+    if ((xref_offset = (off_t)pdfioDictGetNumber(pdf->trailer, "Prev")) <= 0)
+      done = true;
   }
 
   return (true);
diff --git a/pdfio-private.h b/pdfio-private.h
index 807fb2a..dc8c0c7 100644
--- a/pdfio-private.h
+++ b/pdfio-private.h
@@ -127,6 +127,8 @@ struct _pdfio_file_s			// PDF file structure
   pdfio_dict_t	*trailer;		// Trailer dictionary
   pdfio_obj_t	*root;			// Root object/dictionary
   pdfio_obj_t	*info;			// Information object/dictionary
+  pdfio_obj_t	*encrypt;		// Encryption object/dictionary
+  pdfio_array_t	*id_array;		// ID array
 
   // Allocated data elements
   size_t	num_arrays,		// Number of arrays
diff --git a/pdfio.xcodeproj/project.pbxproj b/pdfio.xcodeproj/project.pbxproj
index e5f5200..c1cbb3f 100644
--- a/pdfio.xcodeproj/project.pbxproj
+++ b/pdfio.xcodeproj/project.pbxproj
@@ -20,8 +20,19 @@
 		273440CD263D727800FBFD63 /* pdfio-page.c in Sources */ = {isa = PBXBuildFile; fileRef = 273440C2263D727800FBFD63 /* pdfio-page.c */; };
 		273440D8263D72E100FBFD63 /* testpdfio.c in Sources */ = {isa = PBXBuildFile; fileRef = 273440D7263D72E100FBFD63 /* testpdfio.c */; };
 		273440E4263DD7EA00FBFD63 /* pdfio-token.c in Sources */ = {isa = PBXBuildFile; fileRef = 273440E3263DD7EA00FBFD63 /* pdfio-token.c */; };
+		27ECBD8926419DAB0025312A /* libpdfio.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 273440B0263D6FE200FBFD63 /* libpdfio.a */; };
 /* End PBXBuildFile section */
 
+/* Begin PBXContainerItemProxy section */
+		27ECBD8626419DA40025312A /* PBXContainerItemProxy */ = {
+			isa = PBXContainerItemProxy;
+			containerPortal = 273440A8263D6FE200FBFD63 /* Project object */;
+			proxyType = 1;
+			remoteGlobalIDString = 273440AF263D6FE200FBFD63;
+			remoteInfo = pdfio;
+		};
+/* End PBXContainerItemProxy section */
+
 /* Begin PBXCopyFilesBuildPhase section */
 		273440D0263D72AE00FBFD63 /* CopyFiles */ = {
 			isa = PBXCopyFilesBuildPhase;
@@ -73,6 +84,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				27ECBD8926419DAB0025312A /* libpdfio.a in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -98,6 +110,7 @@
 				273440D7263D72E100FBFD63 /* testpdfio.c */,
 				273440D9263D72EF00FBFD63 /* Documentation */,
 				273440B1263D6FE200FBFD63 /* Products */,
+				27ECBD8826419DAB0025312A /* Frameworks */,
 			);
 			sourceTree = "<group>";
 		};
@@ -125,6 +138,13 @@
 			name = Documentation;
 			sourceTree = "<group>";
 		};
+		27ECBD8826419DAB0025312A /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXHeadersBuildPhase section */
@@ -168,6 +188,7 @@
 			buildRules = (
 			);
 			dependencies = (
+				27ECBD8726419DA40025312A /* PBXTargetDependency */,
 			);
 			name = testpdfio;
 			productName = testpdfio;
@@ -237,6 +258,14 @@
 		};
 /* End PBXSourcesBuildPhase section */
 
+/* Begin PBXTargetDependency section */
+		27ECBD8726419DA40025312A /* PBXTargetDependency */ = {
+			isa = PBXTargetDependency;
+			target = 273440AF263D6FE200FBFD63 /* pdfio */;
+			targetProxy = 27ECBD8626419DA40025312A /* PBXContainerItemProxy */;
+		};
+/* End PBXTargetDependency section */
+
 /* Begin XCBuildConfiguration section */
 		273440B2263D6FE200FBFD63 /* Debug */ = {
 			isa = XCBuildConfiguration;