From 44eb22213b1b5573e645a3b464df076a6f667420 Mon Sep 17 00:00:00 2001
From: Sebastian Rasmussen <sebras@hotmail.com>
Date: Tue, 23 Jun 2009 00:15:32 +0200
Subject: Handle JBIG2 stream global segment dictionary entry.

---
 fitz/fitz_stream.h |  2 ++
 mupdf/mupdf.h      |  2 +-
 mupdf/pdf_image.c  |  2 +-
 mupdf/pdf_stream.c | 42 +++++++++++++++++++++++++++++++++---------
 4 files changed, 37 insertions(+), 11 deletions(-)

diff --git a/fitz/fitz_stream.h b/fitz/fitz_stream.h
index cbd80109..cbead237 100644
--- a/fitz/fitz_stream.h
+++ b/fitz/fitz_stream.h
@@ -268,6 +268,8 @@ fz_error fz_newpredicte(fz_filter **filterp, fz_obj *param);
 fz_error fz_newjbig2d(fz_filter **filterp, fz_obj *param);
 fz_error fz_newjpxd(fz_filter **filterp, fz_obj *param);
 
+fz_error fz_setjbig2dglobalstream(fz_filter *filter, unsigned char *buf, int len);
+
 /*
  * Basic crypto functions.
  * Independent of the rest of fitz.
diff --git a/mupdf/mupdf.h b/mupdf/mupdf.h
index 95df9f24..9100edee 100644
--- a/mupdf/mupdf.h
+++ b/mupdf/mupdf.h
@@ -148,7 +148,7 @@ fz_error pdf_loadindirect(fz_obj **objp, pdf_xref *, fz_obj *ref);
 fz_error pdf_resolve(fz_obj **reforobj, pdf_xref *);
 
 int pdf_isstream(pdf_xref *xref, int oid, int gen);
-fz_error pdf_buildinlinefilter(fz_filter **filterp, fz_obj *stmobj);
+fz_error pdf_buildinlinefilter(fz_filter **filterp, pdf_xref *xref, fz_obj *stmobj);
 fz_error pdf_loadrawstream(fz_buffer **bufp, pdf_xref *xref, int oid, int gen);
 fz_error pdf_loadstream(fz_buffer **bufp, pdf_xref *xref, int oid, int gen);
 fz_error pdf_openrawstream(fz_stream **stmp, pdf_xref *, int oid, int gen);
diff --git a/mupdf/pdf_image.c b/mupdf/pdf_image.c
index c632eee8..83de575d 100644
--- a/mupdf/pdf_image.c
+++ b/mupdf/pdf_image.c
@@ -142,7 +142,7 @@ pdf_loadinlineimage(pdf_image **imgp, pdf_xref *xref,
 	{
 		fz_stream *tempfile;
 
-		error = pdf_buildinlinefilter(&filter, dict);
+		error = pdf_buildinlinefilter(&filter, xref, dict);
 		if (error)
 			return error;
 
diff --git a/mupdf/pdf_stream.c b/mupdf/pdf_stream.c
index 77ff809a..e05bed65 100644
--- a/mupdf/pdf_stream.c
+++ b/mupdf/pdf_stream.c
@@ -26,7 +26,7 @@ pdf_isstream(pdf_xref *xref, int oid, int gen)
  * Create a filter given a name and param dictionary.
  */
 static fz_error
-buildonefilter(fz_filter **fp, fz_obj *f, fz_obj *p)
+buildonefilter(fz_filter **fp, pdf_xref *xref, fz_obj *f, fz_obj *p)
 {
 	fz_filter *decompress;
 	fz_filter *predict;
@@ -111,7 +111,31 @@ buildonefilter(fz_filter **fp, fz_obj *f, fz_obj *p)
 #ifdef HAVE_JBIG2DEC
 	else if (!strcmp(s, "JBIG2Decode"))
 	{
-		/* TODO: extract and feed JBIG2Global */
+		if (fz_isdict(p))
+		{
+			fz_obj *obj = fz_dictgets(p, "JBIG2Globals");
+			if (obj)
+			{
+				fz_buffer *globals;
+
+				error = fz_newjbig2d(fp, p);
+				if (error)
+					return fz_rethrow(error, "cannot create jbig2 filter");
+
+				error = pdf_loadstream(&globals, xref, fz_tonum(obj), fz_togen(obj));
+				if (error)
+					return fz_rethrow(error, "cannot load jbig2 global segments");
+
+				error = fz_setjbig2dglobalstream(*fp, globals->rp, globals->wp - globals->rp);
+				if (error)
+					return fz_rethrow(error, "cannot apply jbig2 global segments");
+
+				fz_dropbuffer(globals);
+
+				return fz_okay;
+			}
+		}
+
 		error = fz_newjbig2d(fp, p);
 	}
 #endif
@@ -137,7 +161,7 @@ buildonefilter(fz_filter **fp, fz_obj *f, fz_obj *p)
  * Assume ownership of head.
  */
 static fz_error
-buildfilterchain(fz_filter **filterp, fz_filter *head, fz_obj *fs, fz_obj *ps)
+buildfilterchain(fz_filter **filterp, pdf_xref *xref, fz_filter *head, fz_obj *fs, fz_obj *ps)
 {
 	fz_error error;
 	fz_filter *newhead;
@@ -154,7 +178,7 @@ buildfilterchain(fz_filter **filterp, fz_filter *head, fz_obj *fs, fz_obj *ps)
 		else
 			p = nil;
 
-		error = buildonefilter(&tail, f, p);
+		error = buildonefilter(&tail, xref, f, p);
 		if (error)
 			return fz_rethrow(error, "cannot create filter");
 
@@ -240,7 +264,7 @@ buildrawfilter(fz_filter **filterp, pdf_xref *xref, fz_obj *stmobj, int oid, int
  * constraining to stream length, and without decryption.
  */
 fz_error
-pdf_buildinlinefilter(fz_filter **filterp, fz_obj *stmobj)
+pdf_buildinlinefilter(fz_filter **filterp, pdf_xref *xref, fz_obj *stmobj)
 {
 	fz_error error;
 	fz_obj *filters;
@@ -252,9 +276,9 @@ pdf_buildinlinefilter(fz_filter **filterp, fz_obj *stmobj)
 	if (filters)
 	{
 		if (fz_isname(filters))
-			error = buildonefilter(filterp, filters, params);
+			error = buildonefilter(filterp, xref, filters, params);
 		else
-			error = buildfilterchain(filterp, nil, filters, params);
+			error = buildfilterchain(filterp, xref, nil, filters, params);
 	}
 	else
 		error = fz_newnullfilter(filterp, -1);
@@ -304,7 +328,7 @@ pdf_buildfilter(fz_filter **filterp, pdf_xref *xref, fz_obj *stmobj, int oid, in
 
 		if (fz_isname(filters))
 		{
-			error = buildonefilter(&tmp, filters, params);
+			error = buildonefilter(&tmp, xref, filters, params);
 			if (error)
 			{
 				error = fz_rethrow(error, "cannot create filter");
@@ -322,7 +346,7 @@ pdf_buildfilter(fz_filter **filterp, pdf_xref *xref, fz_obj *stmobj, int oid, in
 		}
 		else
 		{
-			error = buildfilterchain(&pipe, base, filters, params);
+			error = buildfilterchain(&pipe, xref, base, filters, params);
 			if (error)
 			{
 				error = fz_rethrow(error, "cannot create filter chain");
-- 
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