libxml2/backport-Remove-unneeded-code-in-xmlreader.c.patch

From 274a1b5bec980ababa23e267a8fdcd8b71a5b2b7 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Sun, 20 Feb 2022 16:05:53 +0100
Subject: [PATCH 2/3] Remove unneeded code in xmlreader.c

Now that no references to ID and IDREF attributes are stored in
streaming validation mode, there's no need to try and remove them.

Also remove xmlTextReaderFreeIDTable which was identical to
xmlFreeIDTable.
---
 xmlreader.c | 137 +---------------------------------------------------
 1 file changed, 1 insertion(+), 136 deletions(-)

diff --git a/xmlreader.c b/xmlreader.c
index 72e40b03..b20c70ad 100644
--- a/xmlreader.c
+++ b/xmlreader.c
@@ -228,116 +228,6 @@ static int xmlTextReaderNextTree(xmlTextReaderPtr reader);
 static void xmlTextReaderFreeNode(xmlTextReaderPtr reader, xmlNodePtr cur);
 static void xmlTextReaderFreeNodeList(xmlTextReaderPtr reader, xmlNodePtr cur);
 
-/**
- * xmlFreeID:
- * @not:  A id
- *
- * Deallocate the memory used by an id definition
- */
-static void
-xmlFreeID(xmlIDPtr id) {
-    xmlDictPtr dict = NULL;
-
-    if (id == NULL) return;
-
-    if (id->doc != NULL)
-        dict = id->doc->dict;
-
-    if (id->value != NULL)
-	DICT_FREE(id->value)
-    if (id->name != NULL)
-	DICT_FREE(id->name)
-    xmlFree(id);
-}
-
-/**
- * xmlTextReaderRemoveID:
- * @doc:  the document
- * @attr:  the attribute
- *
- * Remove the given attribute from the ID table maintained internally.
- *
- * Returns -1 if the lookup failed and 0 otherwise
- */
-static int
-xmlTextReaderRemoveID(xmlDocPtr doc, xmlAttrPtr attr) {
-    xmlIDTablePtr table;
-    xmlIDPtr id;
-    xmlChar *ID;
-
-    if (doc == NULL) return(-1);
-    if (attr == NULL) return(-1);
-    table = (xmlIDTablePtr) doc->ids;
-    if (table == NULL)
-        return(-1);
-
-    ID = xmlNodeListGetString(doc, attr->children, 1);
-    if (ID == NULL)
-	return(-1);
-    id = xmlHashLookup(table, ID);
-    xmlFree(ID);
-    if (id == NULL || id->attr != attr) {
-	return(-1);
-    }
-    id->name = attr->name;
-    attr->name = NULL;
-    id->attr = NULL;
-    return(0);
-}
-
-/**
- * xmlTextReaderWalkRemoveRef:
- * @data:  Contents of current link
- * @user:  Value supplied by the user
- *
- * Returns 0 to abort the walk or 1 to continue
- */
-static int
-xmlTextReaderWalkRemoveRef(const void *data, void *user)
-{
-    xmlRefPtr ref = (xmlRefPtr)data;
-    xmlAttrPtr attr = (xmlAttrPtr)user;
-
-    if (ref->attr == attr) { /* Matched: remove and terminate walk */
-        ref->name = xmlStrdup(attr->name);
-        ref->attr = NULL;
-        return 0;
-    }
-    return 1;
-}
-
-/**
- * xmlTextReaderRemoveRef:
- * @doc:  the document
- * @attr:  the attribute
- *
- * Remove the given attribute from the Ref table maintained internally.
- *
- * Returns -1 if the lookup failed and 0 otherwise
- */
-static int
-xmlTextReaderRemoveRef(xmlDocPtr doc, xmlAttrPtr attr) {
-    xmlListPtr ref_list;
-    xmlRefTablePtr table;
-    xmlChar *ID;
-
-    if (doc == NULL) return(-1);
-    if (attr == NULL) return(-1);
-    table = (xmlRefTablePtr) doc->refs;
-    if (table == NULL)
-        return(-1);
-
-    ID = xmlNodeListGetString(doc, attr->children, 1);
-    if (ID == NULL)
-        return(-1);
-    ref_list = xmlHashLookup(table, ID);
-    xmlFree(ID);
-    if(ref_list == NULL)
-        return (-1);
-    xmlListWalk(ref_list, xmlTextReaderWalkRemoveRef, attr);
-    return(0);
-}
-
 /**
  * xmlTextReaderFreeProp:
  * @reader:  the xmlTextReaderPtr used
@@ -358,15 +248,6 @@ xmlTextReaderFreeProp(xmlTextReaderPtr reader, xmlAttrPtr cur) {
     if ((__xmlRegisterCallbacks) && (xmlDeregisterNodeDefaultValue))
 	xmlDeregisterNodeDefaultValue((xmlNodePtr) cur);
 
-    /* Check for ID removal -> leading to invalid references ! */
-    if ((cur->parent != NULL) && (cur->parent->doc != NULL)) {
-        if (xmlIsID(cur->parent->doc, cur->parent, cur))
-	    xmlTextReaderRemoveID(cur->parent->doc, cur);
-	if (((cur->parent->doc->intSubset != NULL) ||
-	     (cur->parent->doc->extSubset != NULL)) &&
-            (xmlIsRef(cur->parent->doc, cur->parent, cur)))
-            xmlTextReaderRemoveRef(cur->parent->doc, cur);
-    }
     if (cur->children != NULL)
         xmlTextReaderFreeNodeList(reader, cur->children);
 
@@ -570,22 +451,6 @@ xmlTextReaderFreeNode(xmlTextReaderPtr reader, xmlNodePtr cur) {
     }
 }
 
-static void
-xmlTextReaderFreeIDTableEntry(void *id, const xmlChar *name ATTRIBUTE_UNUSED) {
-    xmlFreeID((xmlIDPtr) id);
-}
-
-/**
- * xmlTextReaderFreeIDTable:
- * @table:  An id table
- *
- * Deallocate the memory used by an ID hash table.
- */
-static void
-xmlTextReaderFreeIDTable(xmlIDTablePtr table) {
-    xmlHashFree(table, xmlTextReaderFreeIDTableEntry);
-}
-
 /**
  * xmlTextReaderFreeDoc:
  * @reader:  the xmlTextReaderPtr used
@@ -605,7 +470,7 @@ xmlTextReaderFreeDoc(xmlTextReaderPtr reader, xmlDocPtr cur) {
     /*
      * Do this before freeing the children list to avoid ID lookups
      */
-    if (cur->ids != NULL) xmlTextReaderFreeIDTable((xmlIDTablePtr) cur->ids);
+    if (cur->ids != NULL) xmlFreeIDTable((xmlIDTablePtr) cur->ids);
     cur->ids = NULL;
     if (cur->refs != NULL) xmlFreeRefTable((xmlRefTablePtr) cur->refs);
     cur->refs = NULL;
-- 
2.27.0