[libxml2] When calling xmlNodeDump make sure we grow the buffer quickly

[Daniel Veillard <veillard src gnome org>]

commit 23922c536c97e0eaac4bd7fbe68cbf9fceb66b36
Author: Daniel Veillard <veillard redhat com>
Date:   Mon Feb 11 11:52:44 2013 +0800

    When calling xmlNodeDump make sure we grow the buffer quickly
    
    Make sure the underlying new buffer allocated use a double-it scheme
    for the time of the dump.

 xmlsave.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/xmlsave.c b/xmlsave.c
index 829abb3..774404b 100644
--- a/xmlsave.c
+++ b/xmlsave.c
@@ -2247,6 +2247,7 @@ xmlBufNodeDump(xmlBufPtr buf, xmlDocPtr doc, xmlNodePtr cur, int level,
     size_t use;
     int ret;
     xmlOutputBufferPtr outbuf;
+    int oldalloc;
 
     xmlInitParser();
 
@@ -2278,7 +2279,10 @@ xmlBufNodeDump(xmlBufPtr buf, xmlDocPtr doc, xmlNodePtr cur, int level,
     outbuf->written = 0;
 
     use = xmlBufUse(buf);
+    oldalloc = xmlBufGetAllocationScheme(buf);
+    xmlBufSetAllocationScheme(buf, XML_BUFFER_ALLOC_DOUBLEIT);
     xmlNodeDumpOutput(outbuf, doc, cur, level, format, NULL);
+    xmlBufSetAllocationScheme(buf, oldalloc);
     xmlFree(outbuf);
     ret = xmlBufUse(buf) - use;
     return (ret);