From 4bb81417a8484b9399596fe70eec9bb003293617 Mon Sep 17 00:00:00 2001
From: Michael R Sweet <michael.r.sweet@gmail.com>
Date: Sat, 15 May 2021 09:29:37 -0400
Subject: [PATCH] Start fleshing out writing/copying interfaces.

---
 pdfio-object.c | 16 ++++++++++++++++
 pdfio-value.c  | 17 ++++++++++++++---
 pdfio.h        |  1 +
 3 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/pdfio-object.c b/pdfio-object.c
index 996cb11..6c8ecf1 100644
--- a/pdfio-object.c
+++ b/pdfio-object.c
@@ -29,6 +29,22 @@ pdfioObjClose(pdfio_obj_t *obj)		// I - Object
 }
 
 
+//
+// 'pdfioObjCopy()' - Copy an object to another PDF file.
+//
+
+pdfio_obj_t *				// O - New object or `NULL` on error
+pdfioObjCopy(pdfio_file_t *pdf,		// I - PDF file
+             pdfio_obj_t  *srcobj)	// I - Object to copy
+{
+  // TODO: Implement pdfioObjCopy
+  (void)pdf;
+  (void)srcobj;
+
+  return (NULL);
+}
+
+
 //
 // 'pdfioObjCreateStream()' - Create an object (data) stream for writing.
 //
diff --git a/pdfio-value.c b/pdfio-value.c
index e4f907e..9bbfd8b 100644
--- a/pdfio-value.c
+++ b/pdfio-value.c
@@ -24,6 +24,9 @@ _pdfioValueCopy(pdfio_file_t   *pdfdst,	// I - Destination PDF file
                 pdfio_file_t   *pdfsrc,	// I - Source PDF file
                 _pdfio_value_t *vsrc)	// I - Source value
 {
+  pdfio_obj_t	*obj;			// Object reference
+
+
   if (pdfdst == pdfsrc && vsrc->type != PDFIO_VALTYPE_BINARY)
   {
     // For the same document we can copy the values without any other effort
@@ -36,9 +39,17 @@ _pdfioValueCopy(pdfio_file_t   *pdfdst,	// I - Destination PDF file
   switch (vsrc->type)
   {
     case PDFIO_VALTYPE_INDIRECT :
-        // Object references don't copy to other documents
-        _pdfioFileError(pdfdst, "Unable to copy indirect object reference between PDF files.");
-        return (NULL);
+        if ((obj = _pdfioFileFindMappedObject(pdfdst, pdfsrc, vsrc->value.indirect.number)) == NULL)
+        {
+          obj = pdfioObjCopy(pdfdst, pdfioFileFindObject(pdfsrc, vsrc->value.indirect.number));
+	}
+
+        if (!obj)
+          return (NULL);
+
+	vdst->value.indirect.number     = obj->number;
+	vdst->value.indirect.generation = obj->generation;
+	break;
 
     default :
         return (NULL);
diff --git a/pdfio.h b/pdfio.h
index d17888a..6052470 100644
--- a/pdfio.h
+++ b/pdfio.h
@@ -161,6 +161,7 @@ extern const char	*pdfioFileGetVersion(pdfio_file_t *pdf) PDFIO_PUBLIC;
 extern pdfio_file_t	*pdfioFileOpen(const char *filename, pdfio_error_cb_t error_cb, void *error_data) PDFIO_PUBLIC;
 
 extern bool		pdfioObjClose(pdfio_obj_t *obj) PDFIO_PUBLIC;
+extern pdfio_obj_t	*pdfioObjCopy(pdfio_file_t *pdf, pdfio_obj_t *srcobj) PDFIO_PUBLIC;
 extern pdfio_stream_t	*pdfioObjCreateStream(pdfio_obj_t *obj, pdfio_filter_t compression) PDFIO_PUBLIC;
 extern pdfio_array_t	*pdfioObjGetArray(pdfio_obj_t *obj) PDFIO_PUBLIC;
 extern pdfio_dict_t	*pdfioObjGetDict(pdfio_obj_t *obj) PDFIO_PUBLIC;