From 14932d1b860cc59d51054b8db0b9756cb74bc7dd Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Wed, 7 Oct 2015 14:36:32 +0200
Subject: [PATCH] allow to load huge VST plugin states -fixes #6623

by default libxml has a XML_MAX_TEXT_LENGTH of 10M
with base64 encoding that allows at most 2.5MB state.

set XML_PARSE_HUGE to read large sessions
---
 libs/pbd/xml++.cc | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/libs/pbd/xml++.cc b/libs/pbd/xml++.cc
index 4e566a7800..963531c5f5 100644
--- a/libs/pbd/xml++.cc
+++ b/libs/pbd/xml++.cc
@@ -82,26 +82,23 @@ XMLTree::read_internal(bool validate)
 		_doc = 0;
 	}
 
-	xmlParserCtxtPtr ctxt = NULL; /* the parser context */
+	/* create a parser context */
+	xmlParserCtxtPtr ctxt = xmlNewParserCtxt();
+	if (ctxt == NULL) {
+		return false;
+	}
 
 	xmlKeepBlanksDefault(0);
 	/* parse the file, activating the DTD validation option */
 	if (validate) {
-		/* create a parser context */
-		ctxt = xmlNewParserCtxt();
-		if (ctxt == NULL) {
-			return false;
-		}
 		_doc = xmlCtxtReadFile(ctxt, _filename.c_str(), NULL, XML_PARSE_DTDVALID);
 	} else {
-		_doc = xmlParseFile(_filename.c_str());
+		_doc = xmlCtxtReadFile(ctxt, _filename.c_str(), NULL, XML_PARSE_HUGE);
 	}
 
 	/* check if parsing suceeded */
 	if (_doc == NULL) {
-		if (validate) {
-			xmlFreeParserCtxt(ctxt);
-		}
+		xmlFreeParserCtxt(ctxt);
 		return false;
 	} else {
 		/* check if validation suceeded */
@@ -114,9 +111,7 @@ XMLTree::read_internal(bool validate)
 	_root = readnode(xmlDocGetRootElement(_doc));
 
 	/* free up the parser context */
-	if (validate) {
-		xmlFreeParserCtxt(ctxt);
-	}
+	xmlFreeParserCtxt(ctxt);
 
 	return true;
 }