Use libxml2 if requested (with --enable-libxml2) or if expat is not

available.
reviewed by: plam

ChangeLog

@@ -1,3 +1,14 @@
+2005-09-29  Mathias Hasselmann  <mathias.hasselmann@gmx.de>
+
+        reviewed by: plam
+	
+	* configure.in:
+	* src/Makefile.am:
+	* src/fcxml.c:
+
+	Use libxml2 if requested (with --enable-libxml2) or if
+	expat is not available.
+
 2005-09-29  Patrick Lam  <plam@mit.edu>
 	* src/fccache.c (FcGlobalCacheSave, FcDirCacheWrite):
 

configure.in

@@ -197,10 +197,11 @@ AC_ARG_WITH(expat,             [  --with-expat=DIR              Use Expat in DIR
 AC_ARG_WITH(expat-includes,    [  --with-expat-includes=DIR     Use Expat includes in DIR], expat_includes=$withval, expat_includes=yes)
 AC_ARG_WITH(expat-lib,         [  --with-expat-lib=DIR          Use Expat library in DIR], expat_lib=$withval, expat_lib=yes)
 
-case "$expat" in
-no)
+if test "$enable_libxml2" != "yes"; then
+	case "$expat" in
+	no)
 	;;
-*)
+	*)
 		case "$expat_includes" in
 		yes)
 			case "$expat" in
@@ -284,15 +285,34 @@ no)
 		CPPFLAGS="$expatsaved_CPPFLAGS"
 		LIBS="$expatsaved_LIBS"
 		;;
-esac
-AC_SUBST(EXPAT_LIBS)
-AC_SUBST(EXPAT_CFLAGS)
+	esac
 	
-case "$expat" in
-no)
-	AC_MSG_ERROR([Cannot find usable expat library. This could mean that your version is too old.])
+	AC_SUBST(EXPAT_CFLAGS)
+	AC_SUBST(EXPAT_LIBS)
+
+	case "$expat" in
+	no)
+		EXPAT_CFLAGS=""
+		EXPAT_LIBS=""
+
+		AC_MSG_WARN([Cannot find usable expat library. Trying to use libxml2 as fallback.])
 		;;
-esac
+	esac
+fi
+
+#
+# Check libxml2 configuration
+#
+
+AC_ARG_ENABLE(libxml2,         [  --enable-libxml2              Use libxml2 instead of Expat])
+
+if test "$enable_libxml2" = "yes" -o "$expat" = "no"; then
+    PKG_CHECK_MODULES([LIBXML2], [libxml-2.0 >= 2.6])
+    AC_DEFINE_UNQUOTED(ENABLE_LIBXML2,1,[Use libxml2 instead of Expat])
+
+    AC_SUBST(LIBXML2_CFLAGS)
+    AC_SUBST(LIBXML2_LIBS)
+fi
 
 #
 # Set default font directory

src/Makefile.am

@@ -66,6 +66,7 @@ endif
 
 INCLUDES = 						\
 	$(FREETYPE_CFLAGS)				\
+	$(LIBXML2_CFLAGS)				\
 	$(EXPAT_CFLAGS)					\
 	$(WARN_CFLAGS)					\
 	-DFONTCONFIG_PATH='"$(CONFDIR)"'		\
@@ -102,7 +103,7 @@ lib_LTLIBRARIES = libfontconfig.la
 libfontconfig_la_LDFLAGS =			\
 	-version-info @LT_VERSION_INFO@ $(no_undefined) $(export_symbols)
 
-libfontconfig_la_LIBADD = $(FREETYPE_LIBS) $(EXPAT_LIBS)
+libfontconfig_la_LIBADD = $(FREETYPE_LIBS) $(LIBXML2_LIBS) $(EXPAT_LIBS)
 
 install-data-local: install-ms-import-lib install-libtool-import-lib
 

src/fcxml.c

@@ -26,6 +26,19 @@
 #include "fcint.h"
 #include <dirent.h>
 
+#if ENABLE_LIBXML2
+
+#include <libxml/parser.h>
+
+#define XML_Char			xmlChar
+#define XML_Parser			xmlParserCtxtPtr
+#define XML_ParserFree			xmlFreeParserCtxt
+#define XML_GetCurrentLineNumber	xmlSAX2GetLineNumber
+#define XML_GetErrorCode		xmlCtxtGetLastError
+#define XML_ErrorString(Error)		(Error)->message
+
+#else /* ENABLE_LIBXML2 */
+
 #ifndef HAVE_XMLPARSE_H
 #define HAVE_XMLPARSE_H 0
 #endif
@@ -36,6 +49,8 @@
 #include <expat.h>
 #endif
 
+#endif /* ENABLE_LIBXML2 */
+
 #ifdef _WIN32
 #define STRICT
 #include <windows.h>
@@ -2213,11 +2228,35 @@ FcStartDoctypeDecl (void	    *userData,
 	FcConfigMessage (parse, FcSevereError, "invalid doctype \"%s\"", doctypeName);
 }
 
+#if ENABLE_LIBXML2
+
+static void
+FcInternalSubsetDecl (void            *userData,
+		      const XML_Char  *doctypeName,
+		      const XML_Char  *sysid,
+		      const XML_Char  *pubid)
+{
+    FcStartDoctypeDecl (userData, doctypeName, sysid, pubid, 1);
+}
+
+static void
+FcExternalSubsetDecl (void            *userData,
+		      const XML_Char  *doctypeName,
+		      const XML_Char  *sysid,
+		      const XML_Char  *pubid)
+{
+    FcStartDoctypeDecl (userData, doctypeName, sysid, pubid, 0);
+}
+
+#else /* ENABLE_LIBXML2 */
+
 static void
 FcEndDoctypeDecl (void *userData)
 {
 }
 
+#endif /* ENABLE_LIBXML2 */
+
 static FcBool
 FcConfigParseAndLoadDir (FcConfig	*config,
 			 const FcChar8	*name,
@@ -2311,10 +2350,16 @@ FcConfigParseAndLoad (FcConfig	    *config,
     FcChar8	    *filename;
     FILE	    *f;
     int		    len;
-    void	    *buf;
     FcConfigParse   parse;
     FcBool	    error = FcTrue;
     
+#if ENABLE_LIBXML2
+    xmlSAXHandler   sax;
+    char            buf[BUFSIZ];
+#else
+    void	    *buf;
+#endif
+    
     filename = FcConfigFilename (name);
     if (!filename)
 	goto bail0;
@@ -2340,33 +2385,57 @@ FcConfigParseAndLoad (FcConfig	    *config,
     if (!f)
 	goto bail0;
     
+#if ENABLE_LIBXML2
+    memset(&sax, 0, sizeof(sax));
+
+    sax.internalSubset = FcInternalSubsetDecl;
+    sax.externalSubset = FcExternalSubsetDecl;
+    sax.startElement = FcStartElement;
+    sax.endElement = FcEndElement;
+    sax.characters = FcCharacterData;
+
+    p = xmlCreatePushParserCtxt (&sax, &parse, NULL, 0, filename);
+#else
     p = XML_ParserCreate ("UTF-8");
+#endif
+
     if (!p)
 	goto bail1;
 
     if (!FcConfigInit (&parse, name, config, p))
 	goto bail2;
 
+#if !ENABLE_LIBXML2
+
     XML_SetUserData (p, &parse);
     
     XML_SetDoctypeDeclHandler (p, FcStartDoctypeDecl, FcEndDoctypeDecl);
     XML_SetElementHandler (p, FcStartElement, FcEndElement);
     XML_SetCharacterDataHandler (p, FcCharacterData);
 	
+#endif /* ENABLE_LIBXML2 */
+
     do {
+#if !ENABLE_LIBXML2
 	buf = XML_GetBuffer (p, BUFSIZ);
 	if (!buf)
 	{
 	    FcConfigMessage (&parse, FcSevereError, "cannot get parse buffer");
 	    goto bail3;
 	}
+#endif
 	len = fread (buf, 1, BUFSIZ, f);
 	if (len < 0)
 	{
 	    FcConfigMessage (&parse, FcSevereError, "failed reading config file");
 	    goto bail3;
 	}
+
+#if ENABLE_LIBXML2
+	if (xmlParseChunk (p, buf, len, len == 0))
+#else
 	if (!XML_ParseBuffer (p, len, len == 0))
+#endif
 	{
 	    FcConfigMessage (&parse, FcSevereError, "%s", 
 			   XML_ErrorString (XML_GetErrorCode (p)));