Update libxml2 to v2.12.7

modelica-3rdparty · May 20, 2024 · 94c76d2 · 94c76d2
1 parent 9858a41
commit 94c76d2
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diff --git a/.CI/travis_script.sh b/.CI/travis_script.sh
@@ -14,9 +14,9 @@ pushd libxml2/$PLATFORM
 
 which $CMAKE
 
-echo Running cmake: $CMAKE -DZLIB_LIBRARY_RELEASE:FILEPATH="$TRAVIS_BUILD_DIR/ExternData/Resources/Library/$PLATFORM/libzlib.a" -DZLIB_INCLUDE_DIR:PATH="$TRAVIS_BUILD_DIR/ExternData/Resources/C-Sources/zlib/" -DLIBXML2_WITH_C14N:BOOL=OFF -DLIBXML2_WITH_CATALOG:BOOL=OFF -DLIBXML2_WITH_DEBUG:BOOL=OFF -DLIBXML2_WITH_FTP:BOOL=OFF -DLIBXML2_WITH_HTML:BOOL=OFF -DLIBXML2_WITH_HTTP:BOOL=OFF -DLIBXML2_WITH_ICONV:BOOL=OFF -DLIBXML2_WITH_ICU:BOOL=OFF -DLIBXML2_WITH_ISO8859X:BOOL=OFF -DLIBXML2_WITH_LEGACY:BOOL=OFF -DLIBXML2_WITH_LZMA:BOOL=OFF -DLIBXML2_WITH_MEM_DEBUG:BOOL=OFF -DLIBXML2_WITH_MODULES:BOOL=OFF -DLIBXML2_WITH_OUTPUT:BOOL=OFF -DLIBXML2_WITH_PATTERN:BOOL=OFF -DLIBXML2_WITH_PROGRAMS:BOOL=OFF -DLIBXML2_WITH_PUSH:BOOL=OFF -DLIBXML2_WITH_PYTHON:BOOL=OFF -DLIBXML2_WITH_READER:BOOL=OFF -DLIBXML2_WITH_REGEXPS:BOOL=OFF -DLIBXML2_WITH_RUN_DEBUG:BOOL=OFF -DLIBXML2_WITH_SAX1:BOOL=OFF -DLIBXML2_WITH_SCHEMAS:BOOL=OFF -DLIBXML2_WITH_SCHEMATRON:BOOL=OFF -DLIBXML2_WITH_TESTS:BOOL=OFF -DLIBXML2_WITH_THREADS:BOOL=ON -DLIBXML2_WITH_THREAD_ALLOC:BOOL=OFF -DLIBXML2_WITH_TREE:BOOL=OFF -DLIBXML2_WITH_VALID:BOOL=OFF -DLIBXML2_WITH_WRITER:BOOL=OFF -DLIBXML2_WITH_XINCLUDE:BOOL=OFF -DLIBXML2_WITH_XPATH:BOOL=ON -DLIBXML2_WITH_XPTR:BOOL=OFF -DLIBXML2_WITH_XPTR_LOCS:BOOL=OFF -DLIBXML2_WITH_ZLIB:BOOL=ON -DBUILD_SHARED_LIBS:BOOL=OFF -DCPACK_BINARY_7Z:BOOL=OFF -DCPACK_BINARY_IFW:BOOL=OFF -DCPACK_BINARY_NSIS:BOOL=OFF -DCPACK_BINARY_NUGET:BOOL=OFF -DCPACK_BINARY_WIX:BOOL=OFF -DCPACK_BINARY_ZIP:BOOL=OFF -DCPACK_SOURCE_7Z:BOOL=OFF -DCPACK_SOURCE_ZIP:BOOL=OFF -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON ../ -G "${GM}"
+echo Running cmake: $CMAKE -DZLIB_LIBRARY_RELEASE:FILEPATH="$TRAVIS_BUILD_DIR/ExternData/Resources/Library/$PLATFORM/libzlib.a" -DZLIB_INCLUDE_DIR:PATH="$TRAVIS_BUILD_DIR/ExternData/Resources/C-Sources/zlib/" -DLIBXML2_WITH_C14N:BOOL=OFF -DLIBXML2_WITH_CATALOG:BOOL=OFF -DLIBXML2_WITH_DEBUG:BOOL=OFF -DLIBXML2_WITH_FTP:BOOL=OFF -DLIBXML2_WITH_HTML:BOOL=OFF -DLIBXML2_WITH_HTTP:BOOL=OFF -DLIBXML2_WITH_ICONV:BOOL=OFF -DLIBXML2_WITH_ICU:BOOL=OFF -DLIBXML2_WITH_ISO8859X:BOOL=OFF -DLIBXML2_WITH_LEGACY:BOOL=OFF -DLIBXML2_WITH_LZMA:BOOL=OFF -DLIBXML2_WITH_MEM_DEBUG:BOOL=OFF -DLIBXML2_WITH_MODULES:BOOL=OFF -DLIBXML2_WITH_OUTPUT:BOOL=OFF -DLIBXML2_WITH_PATTERN:BOOL=OFF -DLIBXML2_WITH_PROGRAMS:BOOL=OFF -DLIBXML2_WITH_PUSH:BOOL=OFF -DLIBXML2_WITH_PYTHON:BOOL=OFF -DLIBXML2_WITH_READER:BOOL=OFF -DLIBXML2_WITH_REGEXPS:BOOL=OFF -DLIBXML2_WITH_SAX1:BOOL=OFF -DLIBXML2_WITH_SCHEMAS:BOOL=OFF -DLIBXML2_WITH_SCHEMATRON:BOOL=OFF -DLIBXML2_WITH_TESTS:BOOL=OFF -DLIBXML2_WITH_THREADS:BOOL=ON -DLIBXML2_WITH_THREAD_ALLOC:BOOL=OFF -DLIBXML2_WITH_TREE:BOOL=OFF -DLIBXML2_WITH_VALID:BOOL=OFF -DLIBXML2_WITH_WRITER:BOOL=OFF -DLIBXML2_WITH_XINCLUDE:BOOL=OFF -DLIBXML2_WITH_XPATH:BOOL=ON -DLIBXML2_WITH_XPTR:BOOL=OFF -DLIBXML2_WITH_XPTR_LOCS:BOOL=OFF -DLIBXML2_WITH_ZLIB:BOOL=ON -DBUILD_SHARED_LIBS:BOOL=OFF -DCPACK_BINARY_7Z:BOOL=OFF -DCPACK_BINARY_IFW:BOOL=OFF -DCPACK_BINARY_NSIS:BOOL=OFF -DCPACK_BINARY_NUGET:BOOL=OFF -DCPACK_BINARY_WIX:BOOL=OFF -DCPACK_BINARY_ZIP:BOOL=OFF -DCPACK_SOURCE_7Z:BOOL=OFF -DCPACK_SOURCE_ZIP:BOOL=OFF -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON ../ -G "${GM}"
 
-$CMAKE -DZLIB_LIBRARY_RELEASE:FILEPATH="$TRAVIS_BUILD_DIR/ExternData/Resources/Library/$PLATFORM/libzlib.a" -DZLIB_INCLUDE_DIR:PATH="$TRAVIS_BUILD_DIR/ExternData/Resources/C-Sources/zlib/" -DLIBXML2_WITH_C14N:BOOL=OFF -DLIBXML2_WITH_CATALOG:BOOL=OFF -DLIBXML2_WITH_DEBUG:BOOL=OFF -DLIBXML2_WITH_FTP:BOOL=OFF -DLIBXML2_WITH_HTML:BOOL=OFF -DLIBXML2_WITH_HTTP:BOOL=OFF -DLIBXML2_WITH_ICONV:BOOL=OFF -DLIBXML2_WITH_ICU:BOOL=OFF -DLIBXML2_WITH_ISO8859X:BOOL=OFF -DLIBXML2_WITH_LEGACY:BOOL=OFF -DLIBXML2_WITH_LZMA:BOOL=OFF -DLIBXML2_WITH_MEM_DEBUG:BOOL=OFF -DLIBXML2_WITH_MODULES:BOOL=OFF -DLIBXML2_WITH_OUTPUT:BOOL=OFF -DLIBXML2_WITH_PATTERN:BOOL=OFF -DLIBXML2_WITH_PROGRAMS:BOOL=OFF -DLIBXML2_WITH_PUSH:BOOL=OFF -DLIBXML2_WITH_PYTHON:BOOL=OFF -DLIBXML2_WITH_READER:BOOL=OFF -DLIBXML2_WITH_REGEXPS:BOOL=OFF -DLIBXML2_WITH_RUN_DEBUG:BOOL=OFF -DLIBXML2_WITH_SAX1:BOOL=OFF -DLIBXML2_WITH_SCHEMAS:BOOL=OFF -DLIBXML2_WITH_SCHEMATRON:BOOL=OFF -DLIBXML2_WITH_TESTS:BOOL=OFF -DLIBXML2_WITH_THREADS:BOOL=ON -DLIBXML2_WITH_THREAD_ALLOC:BOOL=OFF -DLIBXML2_WITH_TREE:BOOL=OFF -DLIBXML2_WITH_VALID:BOOL=OFF -DLIBXML2_WITH_WRITER:BOOL=OFF -DLIBXML2_WITH_XINCLUDE:BOOL=OFF -DLIBXML2_WITH_XPATH:BOOL=ON -DLIBXML2_WITH_XPTR:BOOL=OFF -DLIBXML2_WITH_XPTR_LOCS:BOOL=OFF -DLIBXML2_WITH_ZLIB:BOOL=ON -DBUILD_SHARED_LIBS:BOOL=OFF -DCPACK_BINARY_7Z:BOOL=OFF -DCPACK_BINARY_IFW:BOOL=OFF -DCPACK_BINARY_NSIS:BOOL=OFF -DCPACK_BINARY_NUGET:BOOL=OFF -DCPACK_BINARY_WIX:BOOL=OFF -DCPACK_BINARY_ZIP:BOOL=OFF -DCPACK_SOURCE_7Z:BOOL=OFF -DCPACK_SOURCE_ZIP:BOOL=OFF -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON ../ -G "${GM}"
+$CMAKE -DZLIB_LIBRARY_RELEASE:FILEPATH="$TRAVIS_BUILD_DIR/ExternData/Resources/Library/$PLATFORM/libzlib.a" -DZLIB_INCLUDE_DIR:PATH="$TRAVIS_BUILD_DIR/ExternData/Resources/C-Sources/zlib/" -DLIBXML2_WITH_C14N:BOOL=OFF -DLIBXML2_WITH_CATALOG:BOOL=OFF -DLIBXML2_WITH_DEBUG:BOOL=OFF -DLIBXML2_WITH_FTP:BOOL=OFF -DLIBXML2_WITH_HTML:BOOL=OFF -DLIBXML2_WITH_HTTP:BOOL=OFF -DLIBXML2_WITH_ICONV:BOOL=OFF -DLIBXML2_WITH_ICU:BOOL=OFF -DLIBXML2_WITH_ISO8859X:BOOL=OFF -DLIBXML2_WITH_LEGACY:BOOL=OFF -DLIBXML2_WITH_LZMA:BOOL=OFF -DLIBXML2_WITH_MEM_DEBUG:BOOL=OFF -DLIBXML2_WITH_MODULES:BOOL=OFF -DLIBXML2_WITH_OUTPUT:BOOL=OFF -DLIBXML2_WITH_PATTERN:BOOL=OFF -DLIBXML2_WITH_PROGRAMS:BOOL=OFF -DLIBXML2_WITH_PUSH:BOOL=OFF -DLIBXML2_WITH_PYTHON:BOOL=OFF -DLIBXML2_WITH_READER:BOOL=OFF -DLIBXML2_WITH_REGEXPS:BOOL=OFF -DLIBXML2_WITH_SAX1:BOOL=OFF -DLIBXML2_WITH_SCHEMAS:BOOL=OFF -DLIBXML2_WITH_SCHEMATRON:BOOL=OFF -DLIBXML2_WITH_TESTS:BOOL=OFF -DLIBXML2_WITH_THREADS:BOOL=ON -DLIBXML2_WITH_THREAD_ALLOC:BOOL=OFF -DLIBXML2_WITH_TREE:BOOL=OFF -DLIBXML2_WITH_VALID:BOOL=OFF -DLIBXML2_WITH_WRITER:BOOL=OFF -DLIBXML2_WITH_XINCLUDE:BOOL=OFF -DLIBXML2_WITH_XPATH:BOOL=ON -DLIBXML2_WITH_XPTR:BOOL=OFF -DLIBXML2_WITH_XPTR_LOCS:BOOL=OFF -DLIBXML2_WITH_ZLIB:BOOL=ON -DBUILD_SHARED_LIBS:BOOL=OFF -DCPACK_BINARY_7Z:BOOL=OFF -DCPACK_BINARY_IFW:BOOL=OFF -DCPACK_BINARY_NSIS:BOOL=OFF -DCPACK_BINARY_NUGET:BOOL=OFF -DCPACK_BINARY_WIX:BOOL=OFF -DCPACK_BINARY_ZIP:BOOL=OFF -DCPACK_SOURCE_7Z:BOOL=OFF -DCPACK_SOURCE_ZIP:BOOL=OFF -DCMAKE_VERBOSE_MAKEFILE:BOOL=ON ../ -G "${GM}"
 
 echo Building with cmake
 $CMAKE --build .

diff --git a/.travis.yml b/.travis.yml
@@ -97,19 +97,21 @@ before_install:
         export msys2+='& set MSYS=winsymlinks:nativestrict '
         export msys2+='& C:\\tools\\msys64\\msys2_shell.cmd -defterm -no-start'
         ## 32bit mingw
-        export mingw32="$msys2 -mingw32 -full-path -here -c \$\* --"
+        export mingw32="$msys2 -mingw32 -full-path -here -c "\"\$@"\" --"
         ## 64bit mingw
-        export mingw64="$msys2 -mingw64 -full-path -here -c \$\* --"
-        export msys2+=" -msys2 -c \$\* --"
-        $msys2 pacman --sync --noconfirm --needed autoconf autoconf-archive automake automake-wrapper binutils cmake gettext git libtool m4 make pkg-config mingw-w64-{i686,x86_64}-toolchain mingw-w64-{i686,x86_64}-clang mingw-w64-{i686,x86_64}-make mingw-w64-{i686,x86_64}-cmake mingw-w64-{i686,x86_64}-extra-cmake-modules mingw-w64-{i686,x86_64}-{gcc,binutils} mingw-w64-{i686,x86_64}-hdf5
+        export mingw64="$msys2 -mingw64 -full-path -here -c "\"\$@"\" --"
+        export msys2+=" -msys2 -c "\"\$@"\" --"
+        $msys2 pacman --sync --noconfirm --needed mingw-w64-{i686,x86_64}-toolchain
         ## Install more MSYS2 packages from https://packages.msys2.org/base here
+        $msys2 pacman --sync --noconfirm --needed autoconf autoconf-archive automake automake-wrapper binutils gettext git libtool m4 make pkg-config mingw-w64-{i686,x86_64}-clang mingw-w64-{i686,x86_64}-make mingw-w64-{i686,x86_64}-cmake mingw-w64-{i686,x86_64}-extra-cmake-modules mingw-w64-{i686,x86_64}-{gcc,binutils} mingw-w64-{i686,x86_64}-hdf5
         taskkill //IM gpg-agent.exe //F  # https://travis-ci.community/t/4967
         export PATH=/C/tools/msys64/mingw64/bin:$PATH
+        export MAKE=mingw32-make  # so that Autotools can find it
         ;;
     esac
   - curl https://bitbucket.org/Swyter/bitbucket-curl-upload-to-repo-downloads/raw/default/upload-to-bitbucket.sh -O -J -L
   - chmod +x ./upload-to-bitbucket.sh
-  - git clone --branch v2.12.5 --depth 1 https://gitlab.gnome.org/GNOME/libxml2
+  - git clone --branch v2.12.7 --depth 1 https://gitlab.gnome.org/GNOME/libxml2
   - mkdir -p libxml2/$PLATFORM
 
 before_cache:

diff --git a/ExternData/Resources/C-Sources/libxml2/HTMLparser.c b/ExternData/Resources/C-Sources/libxml2/HTMLparser.c
@@ -5987,7 +5987,7 @@ htmlCreatePushParserCtxt(htmlSAXHandlerPtr sax, void *user_data,
 
     xmlInitParser();
 
-    buf = xmlAllocParserInputBuffer(enc);
+    buf = xmlAllocParserInputBuffer(XML_CHAR_ENCODING_NONE);
     if (buf == NULL) return(NULL);
 
     ctxt = htmlNewSAXParserCtxt(sax, user_data);
@@ -6018,6 +6018,9 @@ htmlCreatePushParserCtxt(htmlSAXHandlerPtr sax, void *user_data,
 
     inputPush(ctxt, inputStream);
 
+    if (enc != XML_CHAR_ENCODING_NONE)
+        xmlSwitchEncoding(ctxt, enc);
+
     if ((size > 0) && (chunk != NULL) && (ctxt->input != NULL) &&
         (ctxt->input->buf != NULL))  {
 	size_t pos = ctxt->input->cur - ctxt->input->base;

diff --git a/ExternData/Resources/C-Sources/libxml2/SAX2.c b/ExternData/Resources/C-Sources/libxml2/SAX2.c
@@ -955,17 +955,7 @@ xmlSAX2EndDocument(void *ctx)
 
     doc = ctxt->myDoc;
     if ((doc != NULL) && (doc->encoding == NULL)) {
-        const xmlChar *encoding = NULL;
-
-        if ((ctxt->input->flags & XML_INPUT_USES_ENC_DECL) ||
-            (ctxt->input->flags & XML_INPUT_AUTO_ENCODING)) {
-            /* Preserve encoding exactly */
-            encoding = ctxt->encoding;
-        } else if ((ctxt->input->buf) && (ctxt->input->buf->encoder)) {
-            encoding = BAD_CAST ctxt->input->buf->encoder->name;
-        } else if (ctxt->input->flags & XML_INPUT_HAS_ENCODING) {
-            encoding = BAD_CAST "UTF-8";
-        }
+        const xmlChar *encoding = xmlGetActualEncoding(ctxt);
 
         if (encoding != NULL) {
             doc->encoding = xmlStrdup(encoding);

diff --git a/ExternData/Resources/C-Sources/libxml2/include/libxml/xmlversion.h b/ExternData/Resources/C-Sources/libxml2/include/libxml/xmlversion.h
@@ -29,21 +29,21 @@ XMLPUBFUN void xmlCheckVersion(int version);
  *
  * the version string like "1.2.3"
  */
-#define LIBXML_DOTTED_VERSION "2.12.5"
+#define LIBXML_DOTTED_VERSION "2.12.7"
 
 /**
  * LIBXML_VERSION:
  *
  * the version number: 1.2.3 value is 10203
  */
-#define LIBXML_VERSION 21205
+#define LIBXML_VERSION 21207
 
 /**
  * LIBXML_VERSION_STRING:
  *
  * the version number string, 1.2.3 value is "10203"
  */
-#define LIBXML_VERSION_STRING "21205"
+#define LIBXML_VERSION_STRING "21207"
 
 /**
  * LIBXML_VERSION_EXTRA:
@@ -58,7 +58,7 @@ XMLPUBFUN void xmlCheckVersion(int version);
  * Macro to check that the libxml version in use is compatible with
  * the version the software has been compiled against
  */
-#define LIBXML_TEST_VERSION xmlCheckVersion(21205);
+#define LIBXML_TEST_VERSION xmlCheckVersion(21207);
 
 #ifndef VMS
 #if 0

diff --git a/ExternData/Resources/C-Sources/libxml2/include/private/parser.h b/ExternData/Resources/C-Sources/libxml2/include/private/parser.h
@@ -48,6 +48,8 @@ XML_HIDDEN void
 xmlDetectEncoding(xmlParserCtxtPtr ctxt);
 XML_HIDDEN void
 xmlSetDeclaredEncoding(xmlParserCtxtPtr ctxt, xmlChar *encoding);
+XML_HIDDEN const xmlChar *
+xmlGetActualEncoding(xmlParserCtxtPtr ctxt);
 
 XML_HIDDEN xmlParserNsData *
 xmlParserNsCreate(void);

diff --git a/ExternData/Resources/C-Sources/libxml2/parser.c b/ExternData/Resources/C-Sources/libxml2/parser.c
@@ -9424,7 +9424,7 @@ xmlAttrHashInsert(xmlParserCtxtPtr ctxt, unsigned size, const xmlChar *name,
             int nsIndex = (int) (ptrdiff_t) atts[2];
 
             if ((nsIndex == NS_INDEX_EMPTY) ? (uri == NULL) :
-                (nsIndex == NS_INDEX_XML) ? (uri == ctxt->str_xml) :
+                (nsIndex == NS_INDEX_XML) ? (uri == ctxt->str_xml_ns) :
                 (uri == ctxt->nsTab[nsIndex * 2 + 1]))
                 return(bucket->index);
         }

diff --git a/ExternData/Resources/C-Sources/libxml2/parserInternals.c b/ExternData/Resources/C-Sources/libxml2/parserInternals.c
@@ -1479,6 +1479,30 @@ xmlSetDeclaredEncoding(xmlParserCtxtPtr ctxt, xmlChar *encoding) {
     }
 }
 
+/**
+ * xmlGetActualEncoding:
+ * @ctxt:  the parser context
+ *
+ * Returns the actual used to parse the document. This can differ from
+ * the declared encoding.
+ */
+const xmlChar *
+xmlGetActualEncoding(xmlParserCtxtPtr ctxt) {
+    const xmlChar *encoding = NULL;
+
+    if ((ctxt->input->flags & XML_INPUT_USES_ENC_DECL) ||
+        (ctxt->input->flags & XML_INPUT_AUTO_ENCODING)) {
+        /* Preserve encoding exactly */
+        encoding = ctxt->encoding;
+    } else if ((ctxt->input->buf) && (ctxt->input->buf->encoder)) {
+        encoding = BAD_CAST ctxt->input->buf->encoder->name;
+    } else if (ctxt->input->flags & XML_INPUT_HAS_ENCODING) {
+        encoding = BAD_CAST "UTF-8";
+    }
+
+    return(encoding);
+}
+
 /************************************************************************
  *									*
  *	Commodity functions to handle entities processing		*

diff --git a/ExternData/Resources/C-Sources/libxml2/xmlreader.c b/ExternData/Resources/C-Sources/libxml2/xmlreader.c
@@ -40,6 +40,7 @@
 #endif
 
 #include "private/buf.h"
+#include "private/parser.h"
 #include "private/tree.h"
 #ifdef LIBXML_XINCLUDE_ENABLED
 #include "private/xinclude.h"
@@ -2795,20 +2796,17 @@ xmlTextReaderReadAttributeValue(xmlTextReaderPtr reader) {
  */
 const xmlChar *
 xmlTextReaderConstEncoding(xmlTextReaderPtr reader) {
-    xmlDocPtr doc = NULL;
+    const xmlChar *encoding = NULL;
+
     if (reader == NULL)
-	return(NULL);
-    if (reader->doc != NULL)
-        doc = reader->doc;
-    else if (reader->ctxt != NULL)
-	doc = reader->ctxt->myDoc;
-    if (doc == NULL)
-	return(NULL);
+        return(NULL);
 
-    if (doc->encoding == NULL)
-	return(NULL);
-    else
-      return(CONSTSTR(doc->encoding));
+    if (reader->ctxt != NULL)
+        encoding = xmlGetActualEncoding(reader->ctxt);
+    else if (reader->doc != NULL)
+        encoding = reader->doc->encoding;
+
+    return(CONSTSTR(encoding));
 }
 
 

diff --git a/ExternData/Resources/C-Sources/libxml2/xmlsave.c b/ExternData/Resources/C-Sources/libxml2/xmlsave.c
@@ -1391,13 +1391,14 @@ xhtmlAttrListDumpOutput(xmlSaveCtxtPtr ctxt, xmlAttrPtr cur) {
 static void
 xhtmlNodeDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
     int format = ctxt->format, addmeta;
-    xmlNodePtr tmp, root, unformattedNode = NULL;
+    xmlNodePtr tmp, root, unformattedNode = NULL, parent;
     xmlChar *start, *end;
     xmlOutputBufferPtr buf = ctxt->buf;
 
     if (cur == NULL) return;
 
     root = cur;
+    parent = cur->parent;
     while (1) {
         switch (cur->type) {
         case XML_DOCUMENT_NODE:
@@ -1414,7 +1415,9 @@ xhtmlNodeDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
 	    break;
 
         case XML_DOCUMENT_FRAG_NODE:
-            if (cur->children) {
+            /* Always validate cur->parent when descending. */
+            if ((cur->parent == parent) && (cur->children != NULL)) {
+                parent = cur;
                 cur = cur->children;
                 continue;
             }
@@ -1441,6 +1444,16 @@ xhtmlNodeDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
 				      ctxt->indent_nr : ctxt->level),
 				     ctxt->indent);
 
+            /*
+             * Some users like lxml are known to pass nodes with a corrupted
+             * tree structure. Fall back to a recursive call to handle this
+             * case.
+             */
+            if ((cur->parent != parent) && (cur->children != NULL)) {
+                xhtmlNodeDumpOutput(ctxt, cur);
+                break;
+            }
+
             xmlOutputBufferWrite(buf, 1, "<");
             if ((cur->ns != NULL) && (cur->ns->prefix != NULL)) {
                 xmlOutputBufferWriteString(buf, (const char *)cur->ns->prefix);
@@ -1461,10 +1474,10 @@ xhtmlNodeDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
             if (cur->properties != NULL)
                 xhtmlAttrListDumpOutput(ctxt, cur->properties);
 
-            if ((cur->parent != NULL) &&
-                (cur->parent->parent == (xmlNodePtr) cur->doc) &&
+            if ((parent != NULL) &&
+                (parent->parent == (xmlNodePtr) cur->doc) &&
                 xmlStrEqual(cur->name, BAD_CAST"head") &&
-                xmlStrEqual(cur->parent->name, BAD_CAST"html")) {
+                xmlStrEqual(parent->name, BAD_CAST"html")) {
 
                 tmp = cur->children;
                 while (tmp != NULL) {
@@ -1570,6 +1583,7 @@ xhtmlNodeDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
 
                 if (ctxt->format == 1) xmlOutputBufferWrite(buf, 1, "\n");
                 if (ctxt->level >= 0) ctxt->level++;
+                parent = cur;
                 cur = cur->children;
                 continue;
             }
@@ -1664,13 +1678,9 @@ xhtmlNodeDumpOutput(xmlSaveCtxtPtr ctxt, xmlNodePtr cur) {
                 break;
             }
 
-            /*
-             * The parent should never be NULL here but we want to handle
-             * corrupted documents gracefully.
-             */
-            if (cur->parent == NULL)
-                return;
-            cur = cur->parent;
+            cur = parent;
+            /* cur->parent was validated when descending. */
+            parent = cur->parent;
 
             if (cur->type == XML_ELEMENT_NODE) {
                 if (ctxt->level > 0) ctxt->level--;