[glabels/glabels_2_2] Relax libxml limits when parsing label files

[Jim Evins <jimevins src gnome org>]

commit 01b54d65f1bc32538314f01cbe89d89b2d0baa77
Author: Jim Evins <evins snaught com>
Date:   Sat Feb 6 20:21:26 2010 -0500

    Relax libxml limits when parsing label files
    
    Glabels bug #2940758.  Back port from master:  Use XML_PARSE_HUGE parser option
    so that we can handle large text nodes, such as encoded images.  This
    modification is only applied if libxml 2.7+ is available, as to not introduce
    new dependencies.

 configure.in    |    9 +++++++++
 src/Makefile.am |    1 +
 src/xml-label.c |   10 +++++++++-
 3 files changed, 19 insertions(+), 1 deletions(-)
---
diff --git a/configure.in b/configure.in
index 12c9cd3..1d11adc 100644
--- a/configure.in
+++ b/configure.in
@@ -130,6 +130,15 @@ AC_SUBST(MYGAL_LIBS)
 
 
 dnl ---------------------------------------------------------------------------
+dnl - Is XML_PARSE_HUGE available?
+dnl ---------------------------------------------------------------------------
+PKG_CHECK_MODULES(XML_PARSE_HUGE, libxml-2.0 >= 2.7.0,
+                  HAVE_XML_PARSE_HUGE="-DHAVE_XML_PARSE_HUGE",
+                  HAVE_XML_PARSE_HUGE="-UHAVE_XML_PARSE_HUGE")
+AC_SUBST(HAVE_XML_PARSE_HUGE)
+
+
+dnl ---------------------------------------------------------------------------
 dnl - Enable deprecation testing
 dnl ---------------------------------------------------------------------------
 AC_ARG_ENABLE(deprecations,
diff --git a/src/Makefile.am b/src/Makefile.am
index d687e1b..aea2482 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -11,6 +11,7 @@ INCLUDES = \
 	-I$(LIB_BARCODE_DIR)					\
 	-I$(LIB_IEC16022_DIR)					\
 	$(GLABELS_CFLAGS) 					\
+	$(HAVE_XML_PARSE_HUGE)					\
 	$(DISABLE_DEPRECATED_CFLAGS)				\
 	-DPREFIX=\""$(prefix)"\"                        	\
 	-DSYSCONFDIR=\""$(sysconfdir)"\"                	\
diff --git a/src/xml-label.c b/src/xml-label.c
index 5a56d8c..07452b2 100644
--- a/src/xml-label.c
+++ b/src/xml-label.c
@@ -184,7 +184,11 @@ gl_xml_label_open (const gchar      *utf8_filename,
 	filename = g_filename_from_utf8 (utf8_filename, -1, NULL, NULL, NULL);
 	g_return_val_if_fail (filename, NULL);
 
+#ifndef HAVE_XML_PARSE_HUGE
 	doc = xmlParseFile (filename);
+#else
+        doc = xmlReadFile (filename, NULL, XML_PARSE_HUGE);
+#endif
 	if (!doc) {
 		g_message (_("xmlParseFile error"));
 		*status = XML_LABEL_ERROR_OPEN_PARSE;
@@ -221,9 +225,13 @@ gl_xml_label_open_buffer (const gchar      *buffer,
 
 	gl_debug (DEBUG_XML, "START");
 
+#ifndef HAVE_XML_PARSE_HUGE
 	doc = xmlParseDoc ((xmlChar *) buffer);
+#else
+        doc = xmlReadDoc ((xmlChar *) buffer, NULL, NULL, XML_PARSE_HUGE);
+#endif
 	if (!doc) {
-		g_message (_("xmlParseFile error"));
+		g_message (_("xmlParseDoc error"));
 		*status = XML_LABEL_ERROR_OPEN_PARSE;
 		return NULL;
 	}