From d2250034a7e629455b9bfbf735473ea39638a701 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Fri, 1 Apr 2011 16:02:09 +0200
Subject: Use a function pointer for resolveindirect.

This removes a static dependency between fitz and mupdf.
Fitz should now be link time independent of mupdf again.
---
 fitz/fitz.h       |  6 +++---
 fitz/obj_simple.c | 32 ++++++++------------------------
 mupdf/pdf_xref.c  | 28 ++++++++++++++++++++++++++++
 xps/xpstop.c      |  6 ------
 4 files changed, 39 insertions(+), 33 deletions(-)

diff --git a/fitz/fitz.h b/fitz/fitz.h
index f8bef4c3..d4ab8ff4 100644
--- a/fitz/fitz.h
+++ b/fitz/fitz.h
@@ -406,13 +406,15 @@ struct fz_obj_s
 	} u;
 };
 
+extern fz_obj* (*fz_resolveindirect)(fz_obj*);
+
 fz_obj *fz_newnull(void);
 fz_obj *fz_newbool(int b);
 fz_obj *fz_newint(int i);
 fz_obj *fz_newreal(float f);
 fz_obj *fz_newname(char *str);
 fz_obj *fz_newstring(char *str, int len);
-fz_obj *fz_newindirect(int num, int gen, struct pdf_xref_s *xref);
+fz_obj *fz_newindirect(int num, int gen, void *xref);
 
 fz_obj *fz_newarray(int initialcap);
 fz_obj *fz_newdict(int initialcap);
@@ -435,8 +437,6 @@ int fz_isindirect(fz_obj *obj);
 
 int fz_objcmp(fz_obj *a, fz_obj *b);
 
-fz_obj *fz_resolveindirect(fz_obj *obj);
-
 /* silent failure, no error reporting */
 int fz_tobool(fz_obj *obj);
 int fz_toint(fz_obj *obj);
diff --git a/fitz/obj_simple.c b/fitz/obj_simple.c
index f279bd55..b629974e 100644
--- a/fitz/obj_simple.c
+++ b/fitz/obj_simple.c
@@ -1,9 +1,15 @@
 #include "fitz.h"
-#include "mupdf.h" /* for pdf_loadobject */
 
 extern void fz_freearray(fz_obj *array);
 extern void fz_freedict(fz_obj *dict);
 
+static fz_obj *fz_resolve_indirect_null(fz_obj *ref)
+{
+	return ref;
+}
+
+fz_obj* (*fz_resolveindirect)(fz_obj*) = fz_resolve_indirect_null;
+
 fz_obj *
 fz_newnull(void)
 {
@@ -66,7 +72,7 @@ fz_newname(char *str)
 }
 
 fz_obj *
-fz_newindirect(int num, int gen, pdf_xref *xref)
+fz_newindirect(int num, int gen, void *xref)
 {
 	fz_obj *o = fz_malloc(sizeof(fz_obj));
 	o->refs = 1;
@@ -219,28 +225,6 @@ int fz_togen(fz_obj *obj)
 	return 0;
 }
 
-fz_obj *fz_resolveindirect(fz_obj *ref)
-{
-	if (fz_isindirect(ref))
-	{
-		pdf_xref *xref = ref->u.r.xref;
-		int num = fz_tonum(ref);
-		int gen = fz_togen(ref);
-		if (xref)
-		{
-			fz_error error = pdf_cacheobject(xref, num, gen);
-			if (error)
-			{
-				fz_catch(error, "cannot load object (%d %d R) into cache", num, gen);
-				return ref;
-			}
-			if (xref->table[num].obj)
-				return xref->table[num].obj;
-		}
-	}
-	return ref;
-}
-
 int
 fz_objcmp(fz_obj *a, fz_obj *b)
 {
diff --git a/mupdf/pdf_xref.c b/mupdf/pdf_xref.c
index 7174cfc5..4ec23a30 100644
--- a/mupdf/pdf_xref.c
+++ b/mupdf/pdf_xref.c
@@ -1,6 +1,8 @@
 #include "fitz.h"
 #include "mupdf.h"
 
+static fz_obj *pdf_resolveindirect(fz_obj *ref);
+
 static inline int iswhite(int ch)
 {
 	return
@@ -535,6 +537,9 @@ pdf_openxrefwithstream(pdf_xref **xrefp, fz_stream *file, char *password)
 	fz_obj *dict, *obj;
 	int i, repaired = 0;
 
+	/* install pdf specific callback */
+	fz_resolveindirect = pdf_resolveindirect;
+
 	xref = fz_malloc(sizeof(pdf_xref));
 
 	memset(xref, 0, sizeof(pdf_xref));
@@ -893,6 +898,29 @@ pdf_loadobject(fz_obj **objp, pdf_xref *xref, int num, int gen)
 	return fz_okay;
 }
 
+static fz_obj *
+pdf_resolveindirect(fz_obj *ref)
+{
+	if (fz_isindirect(ref))
+	{
+		pdf_xref *xref = ref->u.r.xref;
+		int num = fz_tonum(ref);
+		int gen = fz_togen(ref);
+		if (xref)
+		{
+			fz_error error = pdf_cacheobject(xref, num, gen);
+			if (error)
+			{
+				fz_catch(error, "cannot load object (%d %d R) into cache", num, gen);
+				return ref;
+			}
+			if (xref->table[num].obj)
+				return xref->table[num].obj;
+		}
+	}
+	return ref;
+}
+
 /* Replace numbered object -- for use by pdfclean and similar tools */
 void
 pdf_updateobject(pdf_xref *xref, int num, int gen, fz_obj *newobj)
diff --git a/xps/xpstop.c b/xps/xpstop.c
index 2ae1d585..921d677a 100644
--- a/xps/xpstop.c
+++ b/xps/xpstop.c
@@ -21,12 +21,6 @@ fz_colorspace *colorspace;
 fz_glyphcache *glyphcache;
 char *filename;
 
-/* stub function for automatic resolution of indirect objects in obj_simple.c */
-int pdf_cacheobject(struct pdf_xref_s *xref, int num, int gen)
-{
-	return fz_throw("not a pdf");
-}
-
 struct {
 	int count, total;
 	int min, max;
-- 
cgit v1.2.3