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libxml2/xinclude.c
Nick Wellnhofer 15ed75664b xinclude: Fix warning when building --without-xptr
2024-06-06 22:18:05 +02:00

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/*
* xinclude.c : Code to implement XInclude processing
*
* World Wide Web Consortium W3C Last Call Working Draft 10 November 2003
* http://www.w3.org/TR/2003/WD-xinclude-20031110
*
* See Copyright for the status of this software.
*
* daniel@veillard.com
*/
#define IN_LIBXML
#include "libxml.h"
#include <string.h>
#include <libxml/xmlmemory.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/uri.h>
#include <libxml/xpath.h>
#include <libxml/xpointer.h>
#include <libxml/parserInternals.h>
#include <libxml/xmlerror.h>
#include <libxml/encoding.h>
#ifdef LIBXML_XINCLUDE_ENABLED
#include <libxml/xinclude.h>
#include "private/buf.h"
#include "private/error.h"
#include "private/tree.h"
#include "private/xinclude.h"
#define XINCLUDE_MAX_DEPTH 40
/************************************************************************
* *
* XInclude context handling *
* *
************************************************************************/
/*
* An XInclude context
*/
typedef xmlChar *xmlURL;
typedef struct _xmlXIncludeRef xmlXIncludeRef;
typedef xmlXIncludeRef *xmlXIncludeRefPtr;
struct _xmlXIncludeRef {
xmlChar *URI; /* the fully resolved resource URL */
xmlChar *fragment; /* the fragment in the URI */
xmlChar *base; /* base URI of xi:include element */
xmlNodePtr elem; /* the xi:include element */
xmlNodePtr inc; /* the included copy */
int xml; /* xml or txt */
int fallback; /* fallback was loaded */
int expanding; /* flag to detect inclusion loops */
int replace; /* should the node be replaced? */
};
typedef struct _xmlXIncludeDoc xmlXIncludeDoc;
typedef xmlXIncludeDoc *xmlXIncludeDocPtr;
struct _xmlXIncludeDoc {
xmlDocPtr doc; /* the parsed document */
xmlChar *url; /* the URL */
int expanding; /* flag to detect inclusion loops */
};
typedef struct _xmlXIncludeTxt xmlXIncludeTxt;
typedef xmlXIncludeTxt *xmlXIncludeTxtPtr;
struct _xmlXIncludeTxt {
xmlChar *text; /* text string */
xmlChar *url; /* the URL */
};
struct _xmlXIncludeCtxt {
xmlDocPtr doc; /* the source document */
int incNr; /* number of includes */
int incMax; /* size of includes tab */
xmlXIncludeRefPtr *incTab; /* array of included references */
int txtNr; /* number of unparsed documents */
int txtMax; /* size of unparsed documents tab */
xmlXIncludeTxt *txtTab; /* array of unparsed documents */
int urlNr; /* number of documents stacked */
int urlMax; /* size of document stack */
xmlXIncludeDoc *urlTab; /* document stack */
int nbErrors; /* the number of errors detected */
int fatalErr; /* abort processing */
int errNo; /* error code */
int legacy; /* using XINCLUDE_OLD_NS */
int parseFlags; /* the flags used for parsing XML documents */
void *_private; /* application data */
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
unsigned long incTotal; /* total number of processed inclusions */
#endif
int depth; /* recursion depth */
int isStream; /* streaming mode */
xmlXPathContextPtr xpctxt;
xmlStructuredErrorFunc errorHandler;
void *errorCtxt;
};
static xmlXIncludeRefPtr
xmlXIncludeExpandNode(xmlXIncludeCtxtPtr ctxt, xmlNodePtr node);
static int
xmlXIncludeLoadNode(xmlXIncludeCtxtPtr ctxt, xmlXIncludeRefPtr ref);
static int
xmlXIncludeDoProcess(xmlXIncludeCtxtPtr ctxt, xmlNodePtr tree);
/************************************************************************
* *
* XInclude error handler *
* *
************************************************************************/
/**
* xmlXIncludeErrMemory:
* @extra: extra information
*
* Handle an out of memory condition
*/
static void
xmlXIncludeErrMemory(xmlXIncludeCtxtPtr ctxt)
{
ctxt->errNo = XML_ERR_NO_MEMORY;
ctxt->fatalErr = 1;
ctxt->nbErrors++;
xmlRaiseMemoryError(ctxt->errorHandler, NULL, ctxt->errorCtxt,
XML_FROM_XINCLUDE, NULL);
}
/**
* xmlXIncludeErr:
* @ctxt: the XInclude context
* @node: the context node
* @msg: the error message
* @extra: extra information
*
* Handle an XInclude error
*/
static void LIBXML_ATTR_FORMAT(4,0)
xmlXIncludeErr(xmlXIncludeCtxtPtr ctxt, xmlNodePtr node, int error,
const char *msg, const xmlChar *extra)
{
xmlStructuredErrorFunc schannel = NULL;
xmlGenericErrorFunc channel = NULL;
void *data = NULL;
int res;
if (ctxt->fatalErr != 0)
return;
ctxt->nbErrors++;
schannel = ctxt->errorHandler;
data = ctxt->errorCtxt;
if (schannel == NULL) {
channel = xmlGenericError;
data = xmlGenericErrorContext;
}
res = __xmlRaiseError(schannel, channel, data, ctxt, node,
XML_FROM_XINCLUDE, error, XML_ERR_ERROR,
NULL, 0, (const char *) extra, NULL, NULL, 0, 0,
msg, (const char *) extra);
if (res < 0) {
ctxt->errNo = XML_ERR_NO_MEMORY;
ctxt->fatalErr = 1;
} else {
ctxt->errNo = error;
}
}
/**
* xmlXIncludeGetProp:
* @ctxt: the XInclude context
* @cur: the node
* @name: the attribute name
*
* Get an XInclude attribute
*
* Returns the value (to be freed) or NULL if not found
*/
static xmlChar *
xmlXIncludeGetProp(xmlXIncludeCtxtPtr ctxt, xmlNodePtr cur,
const xmlChar *name) {
xmlChar *ret;
if (xmlNodeGetAttrValue(cur, name, XINCLUDE_NS, &ret) < 0)
xmlXIncludeErrMemory(ctxt);
if (ret != NULL)
return(ret);
if (ctxt->legacy != 0) {
if (xmlNodeGetAttrValue(cur, name, XINCLUDE_OLD_NS, &ret) < 0)
xmlXIncludeErrMemory(ctxt);
if (ret != NULL)
return(ret);
}
if (xmlNodeGetAttrValue(cur, name, NULL, &ret) < 0)
xmlXIncludeErrMemory(ctxt);
return(ret);
}
/**
* xmlXIncludeFreeRef:
* @ref: the XInclude reference
*
* Free an XInclude reference
*/
static void
xmlXIncludeFreeRef(xmlXIncludeRefPtr ref) {
if (ref == NULL)
return;
if (ref->URI != NULL)
xmlFree(ref->URI);
if (ref->fragment != NULL)
xmlFree(ref->fragment);
if (ref->base != NULL)
xmlFree(ref->base);
xmlFree(ref);
}
/**
* xmlXIncludeNewContext:
* @doc: an XML Document
*
* Creates a new XInclude context
*
* Returns the new set
*/
xmlXIncludeCtxtPtr
xmlXIncludeNewContext(xmlDocPtr doc) {
xmlXIncludeCtxtPtr ret;
if (doc == NULL)
return(NULL);
ret = (xmlXIncludeCtxtPtr) xmlMalloc(sizeof(xmlXIncludeCtxt));
if (ret == NULL)
return(NULL);
memset(ret, 0, sizeof(xmlXIncludeCtxt));
ret->doc = doc;
ret->incNr = 0;
ret->incMax = 0;
ret->incTab = NULL;
ret->nbErrors = 0;
return(ret);
}
/**
* xmlXIncludeFreeContext:
* @ctxt: the XInclude context
*
* Free an XInclude context
*/
void
xmlXIncludeFreeContext(xmlXIncludeCtxtPtr ctxt) {
int i;
if (ctxt == NULL)
return;
if (ctxt->urlTab != NULL) {
for (i = 0; i < ctxt->urlNr; i++) {
xmlFreeDoc(ctxt->urlTab[i].doc);
xmlFree(ctxt->urlTab[i].url);
}
xmlFree(ctxt->urlTab);
}
for (i = 0;i < ctxt->incNr;i++) {
if (ctxt->incTab[i] != NULL)
xmlXIncludeFreeRef(ctxt->incTab[i]);
}
if (ctxt->incTab != NULL)
xmlFree(ctxt->incTab);
if (ctxt->txtTab != NULL) {
for (i = 0;i < ctxt->txtNr;i++) {
xmlFree(ctxt->txtTab[i].text);
xmlFree(ctxt->txtTab[i].url);
}
xmlFree(ctxt->txtTab);
}
if (ctxt->xpctxt != NULL)
xmlXPathFreeContext(ctxt->xpctxt);
xmlFree(ctxt);
}
/**
* xmlXIncludeParseFile:
* @ctxt: the XInclude context
* @URL: the URL or file path
*
* parse a document for XInclude
*/
static xmlDocPtr
xmlXIncludeParseFile(xmlXIncludeCtxtPtr ctxt, const char *URL) {
xmlDocPtr ret = NULL;
xmlParserCtxtPtr pctxt;
xmlParserInputPtr inputStream;
xmlInitParser();
pctxt = xmlNewParserCtxt();
if (pctxt == NULL) {
xmlXIncludeErrMemory(ctxt);
return(NULL);
}
if (ctxt->errorHandler != NULL)
xmlCtxtSetErrorHandler(pctxt, ctxt->errorHandler, ctxt->errorCtxt);
/*
* pass in the application data to the parser context.
*/
pctxt->_private = ctxt->_private;
/*
* try to ensure that new documents included are actually
* built with the same dictionary as the including document.
*/
if ((ctxt->doc != NULL) && (ctxt->doc->dict != NULL)) {
if (pctxt->dict != NULL)
xmlDictFree(pctxt->dict);
pctxt->dict = ctxt->doc->dict;
xmlDictReference(pctxt->dict);
}
xmlCtxtUseOptions(pctxt, ctxt->parseFlags);
inputStream = xmlLoadExternalEntity(URL, NULL, pctxt);
if (inputStream == NULL)
goto error;
inputPush(pctxt, inputStream);
xmlParseDocument(pctxt);
if (pctxt->wellFormed) {
ret = pctxt->myDoc;
}
else {
ret = NULL;
if (pctxt->myDoc != NULL)
xmlFreeDoc(pctxt->myDoc);
pctxt->myDoc = NULL;
}
error:
if (pctxt->errNo == XML_ERR_NO_MEMORY)
xmlXIncludeErrMemory(ctxt);
xmlFreeParserCtxt(pctxt);
return(ret);
}
/**
* xmlXIncludeAddNode:
* @ctxt: the XInclude context
* @cur: the new node
*
* Add a new node to process to an XInclude context
*/
static xmlXIncludeRefPtr
xmlXIncludeAddNode(xmlXIncludeCtxtPtr ctxt, xmlNodePtr cur) {
xmlXIncludeRefPtr ref = NULL;
xmlXIncludeRefPtr ret = NULL;
xmlURIPtr uri = NULL;
xmlChar *href = NULL;
xmlChar *parse = NULL;
xmlChar *fragment = NULL;
xmlChar *base = NULL;
xmlChar *tmp;
int xml = 1;
int local = 0;
int res;
if (ctxt == NULL)
return(NULL);
if (cur == NULL)
return(NULL);
/*
* read the attributes
*/
fragment = xmlXIncludeGetProp(ctxt, cur, XINCLUDE_PARSE_XPOINTER);
href = xmlXIncludeGetProp(ctxt, cur, XINCLUDE_HREF);
if (href == NULL) {
if (fragment == NULL) {
xmlXIncludeErr(ctxt, cur, XML_XINCLUDE_NO_HREF,
"href or xpointer must be present\n", parse);
goto error;
}
href = xmlStrdup(BAD_CAST ""); /* @@@@ href is now optional */
if (href == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
}
parse = xmlXIncludeGetProp(ctxt, cur, XINCLUDE_PARSE);
if (parse != NULL) {
if (xmlStrEqual(parse, XINCLUDE_PARSE_XML))
xml = 1;
else if (xmlStrEqual(parse, XINCLUDE_PARSE_TEXT))
xml = 0;
else {
xmlXIncludeErr(ctxt, cur, XML_XINCLUDE_PARSE_VALUE,
"invalid value %s for 'parse'\n", parse);
goto error;
}
}
/*
* Check the URL and remove any fragment identifier
*/
res = xmlParseURISafe((const char *)href, &uri);
if (uri == NULL) {
if (res < 0)
xmlXIncludeErrMemory(ctxt);
else
xmlXIncludeErr(ctxt, cur, XML_XINCLUDE_HREF_URI,
"invalid value href %s\n", href);
goto error;
}
if (uri->fragment != NULL) {
if (ctxt->legacy != 0) {
if (fragment == NULL) {
fragment = (xmlChar *) uri->fragment;
} else {
xmlFree(uri->fragment);
}
} else {
xmlXIncludeErr(ctxt, cur, XML_XINCLUDE_FRAGMENT_ID,
"Invalid fragment identifier in URI %s use the xpointer attribute\n",
href);
goto error;
}
uri->fragment = NULL;
}
tmp = xmlSaveUri(uri);
if (tmp == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
xmlFree(href);
href = tmp;
/*
* Resolve URI
*/
if (xmlNodeGetBaseSafe(ctxt->doc, cur, &base) < 0) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
if (href[0] != 0) {
if (xmlBuildURISafe(href, base, &tmp) < 0) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
if (tmp == NULL) {
xmlXIncludeErr(ctxt, cur, XML_XINCLUDE_HREF_URI,
"failed build URL\n", NULL);
goto error;
}
xmlFree(href);
href = tmp;
if (xmlStrEqual(href, ctxt->doc->URL))
local = 1;
} else {
local = 1;
}
/*
* If local and xml then we need a fragment
*/
if ((local == 1) && (xml == 1) &&
((fragment == NULL) || (fragment[0] == 0))) {
xmlXIncludeErr(ctxt, cur, XML_XINCLUDE_RECURSION,
"detected a local recursion with no xpointer in %s\n",
href);
goto error;
}
ref = (xmlXIncludeRefPtr) xmlMalloc(sizeof(xmlXIncludeRef));
if (ref == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
memset(ref, 0, sizeof(xmlXIncludeRef));
ref->elem = cur;
ref->xml = xml;
ref->URI = href;
href = NULL;
ref->fragment = fragment;
fragment = NULL;
/*
* xml:base fixup
*/
if (((ctxt->parseFlags & XML_PARSE_NOBASEFIX) == 0) &&
(cur->doc != NULL) &&
((cur->doc->parseFlags & XML_PARSE_NOBASEFIX) == 0)) {
if (base != NULL) {
ref->base = base;
base = NULL;
} else {
ref->base = xmlStrdup(BAD_CAST "");
if (ref->base == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
}
}
if (ctxt->incNr >= ctxt->incMax) {
xmlXIncludeRefPtr *table;
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
size_t newSize = ctxt->incMax ? ctxt->incMax * 2 : 1;
#else
size_t newSize = ctxt->incMax ? ctxt->incMax * 2 : 4;
#endif
table = (xmlXIncludeRefPtr *) xmlRealloc(ctxt->incTab,
newSize * sizeof(ctxt->incTab[0]));
if (table == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
ctxt->incTab = table;
ctxt->incMax = newSize;
}
ctxt->incTab[ctxt->incNr++] = ref;
ret = ref;
ref = NULL;
error:
xmlXIncludeFreeRef(ref);
xmlFreeURI(uri);
xmlFree(href);
xmlFree(parse);
xmlFree(fragment);
xmlFree(base);
return(ret);
}
/**
* xmlXIncludeRecurseDoc:
* @ctxt: the XInclude context
* @doc: the new document
* @url: the associated URL
*
* The XInclude recursive nature is handled at this point.
*/
static void
xmlXIncludeRecurseDoc(xmlXIncludeCtxtPtr ctxt, xmlDocPtr doc) {
xmlDocPtr oldDoc;
xmlXIncludeRefPtr *oldIncTab;
int oldIncMax, oldIncNr, oldIsStream;
int i;
oldDoc = ctxt->doc;
oldIncMax = ctxt->incMax;
oldIncNr = ctxt->incNr;
oldIncTab = ctxt->incTab;
oldIsStream = ctxt->isStream;
ctxt->doc = doc;
ctxt->incMax = 0;
ctxt->incNr = 0;
ctxt->incTab = NULL;
ctxt->isStream = 0;
xmlXIncludeDoProcess(ctxt, xmlDocGetRootElement(doc));
if (ctxt->incTab != NULL) {
for (i = 0; i < ctxt->incNr; i++)
xmlXIncludeFreeRef(ctxt->incTab[i]);
xmlFree(ctxt->incTab);
}
ctxt->doc = oldDoc;
ctxt->incMax = oldIncMax;
ctxt->incNr = oldIncNr;
ctxt->incTab = oldIncTab;
ctxt->isStream = oldIsStream;
}
/************************************************************************
* *
* Node copy with specific semantic *
* *
************************************************************************/
static void
xmlXIncludeBaseFixup(xmlXIncludeCtxtPtr ctxt, xmlNodePtr cur, xmlNodePtr copy,
const xmlChar *targetBase) {
xmlChar *base = NULL;
xmlChar *relBase = NULL;
xmlNs ns;
int res;
if (cur->type != XML_ELEMENT_NODE)
return;
if (xmlNodeGetBaseSafe(cur->doc, cur, &base) < 0)
xmlXIncludeErrMemory(ctxt);
if ((base != NULL) && !xmlStrEqual(base, targetBase)) {
if (xmlBuildRelativeURISafe(base, targetBase, &relBase) < 0) {
xmlXIncludeErrMemory(ctxt);
goto done;
}
if (relBase == NULL) {
xmlXIncludeErr(ctxt, cur,
XML_XINCLUDE_HREF_URI,
"Building relative URI failed: %s\n",
base);
goto done;
}
/*
* If the new base doesn't contain a slash, it can be omitted.
*/
if (xmlStrchr(relBase, '/') != NULL) {
res = xmlNodeSetBase(copy, relBase);
if (res < 0)
xmlXIncludeErrMemory(ctxt);
goto done;
}
}
/*
* Delete existing xml:base if bases are equal
*/
memset(&ns, 0, sizeof(ns));
ns.href = XML_XML_NAMESPACE;
xmlUnsetNsProp(copy, &ns, BAD_CAST "base");
done:
xmlFree(base);
xmlFree(relBase);
}
/**
* xmlXIncludeCopyNode:
* @ctxt: the XInclude context
* @elem: the element
* @copyChildren: copy children instead of node if true
*
* Make a copy of the node while expanding nested XIncludes.
*
* Returns a node list, not a single node.
*/
static xmlNodePtr
xmlXIncludeCopyNode(xmlXIncludeCtxtPtr ctxt, xmlNodePtr elem,
int copyChildren, const xmlChar *targetBase) {
xmlNodePtr result = NULL;
xmlNodePtr insertParent = NULL;
xmlNodePtr insertLast = NULL;
xmlNodePtr cur;
xmlNodePtr item;
int depth = 0;
if (copyChildren) {
cur = elem->children;
if (cur == NULL)
return(NULL);
} else {
cur = elem;
}
while (1) {
xmlNodePtr copy = NULL;
int recurse = 0;
if ((cur->type == XML_DOCUMENT_NODE) ||
(cur->type == XML_DTD_NODE)) {
;
} else if ((cur->type == XML_ELEMENT_NODE) &&
(cur->ns != NULL) &&
(xmlStrEqual(cur->name, XINCLUDE_NODE)) &&
((xmlStrEqual(cur->ns->href, XINCLUDE_NS)) ||
(xmlStrEqual(cur->ns->href, XINCLUDE_OLD_NS)))) {
xmlXIncludeRefPtr ref = xmlXIncludeExpandNode(ctxt, cur);
if (ref == NULL)
goto error;
/*
* TODO: Insert XML_XINCLUDE_START and XML_XINCLUDE_END nodes
*/
for (item = ref->inc; item != NULL; item = item->next) {
copy = xmlStaticCopyNode(item, ctxt->doc, insertParent, 1);
if (copy == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
if (result == NULL)
result = copy;
if (insertLast != NULL) {
insertLast->next = copy;
copy->prev = insertLast;
} else if (insertParent != NULL) {
insertParent->children = copy;
}
insertLast = copy;
if ((depth == 0) && (targetBase != NULL))
xmlXIncludeBaseFixup(ctxt, item, copy, targetBase);
}
} else {
copy = xmlStaticCopyNode(cur, ctxt->doc, insertParent, 2);
if (copy == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
if (result == NULL)
result = copy;
if (insertLast != NULL) {
insertLast->next = copy;
copy->prev = insertLast;
} else if (insertParent != NULL) {
insertParent->children = copy;
}
insertLast = copy;
if ((depth == 0) && (targetBase != NULL))
xmlXIncludeBaseFixup(ctxt, cur, copy, targetBase);
recurse = (cur->type != XML_ENTITY_REF_NODE) &&
(cur->children != NULL);
}
if (recurse) {
cur = cur->children;
insertParent = insertLast;
insertLast = NULL;
depth += 1;
continue;
}
if (cur == elem)
return(result);
while (cur->next == NULL) {
if (insertParent != NULL)
insertParent->last = insertLast;
cur = cur->parent;
if (cur == elem)
return(result);
insertLast = insertParent;
insertParent = insertParent->parent;
depth -= 1;
}
cur = cur->next;
}
error:
xmlFreeNodeList(result);
return(NULL);
}
#ifdef LIBXML_XPTR_LOCS_ENABLED
/**
* xmlXIncludeGetNthChild:
* @cur: the node
* @no: the child number
*
* Returns the @n'th element child of @cur or NULL
*/
static xmlNodePtr
xmlXIncludeGetNthChild(xmlNodePtr cur, int no) {
int i;
if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL))
return(NULL);
cur = cur->children;
for (i = 0;i <= no;cur = cur->next) {
if (cur == NULL)
return(cur);
if ((cur->type == XML_ELEMENT_NODE) ||
(cur->type == XML_DOCUMENT_NODE) ||
(cur->type == XML_HTML_DOCUMENT_NODE)) {
i++;
if (i == no)
break;
}
}
return(cur);
}
xmlNodePtr xmlXPtrAdvanceNode(xmlNodePtr cur, int *level); /* in xpointer.c */
/**
* xmlXIncludeCopyRange:
* @ctxt: the XInclude context
* @obj: the XPointer result from the evaluation.
*
* Build a node list tree copy of the XPointer result.
*
* Returns an xmlNodePtr list or NULL.
* The caller has to free the node tree.
*/
static xmlNodePtr
xmlXIncludeCopyRange(xmlXIncludeCtxtPtr ctxt, xmlXPathObjectPtr range) {
/* pointers to generated nodes */
xmlNodePtr list = NULL, last = NULL, listParent = NULL;
xmlNodePtr tmp, tmp2;
/* pointers to traversal nodes */
xmlNodePtr start, cur, end;
int index1, index2;
int level = 0, lastLevel = 0, endLevel = 0, endFlag = 0;
if ((ctxt == NULL) || (range == NULL))
return(NULL);
if (range->type != XPATH_RANGE)
return(NULL);
start = (xmlNodePtr) range->user;
if ((start == NULL) || (start->type == XML_NAMESPACE_DECL))
return(NULL);
end = range->user2;
if (end == NULL)
return(xmlDocCopyNode(start, ctxt->doc, 1));
if (end->type == XML_NAMESPACE_DECL)
return(NULL);
cur = start;
index1 = range->index;
index2 = range->index2;
/*
* level is depth of the current node under consideration
* list is the pointer to the root of the output tree
* listParent is a pointer to the parent of output tree (within
the included file) in case we need to add another level
* last is a pointer to the last node added to the output tree
* lastLevel is the depth of last (relative to the root)
*/
while (cur != NULL) {
/*
* Check if our output tree needs a parent
*/
if (level < 0) {
while (level < 0) {
/* copy must include namespaces and properties */
tmp2 = xmlDocCopyNode(listParent, ctxt->doc, 2);
xmlAddChild(tmp2, list);
list = tmp2;
listParent = listParent->parent;
level++;
}
last = list;
lastLevel = 0;
}
/*
* Check whether we need to change our insertion point
*/
while (level < lastLevel) {
last = last->parent;
lastLevel --;
}
if (cur == end) { /* Are we at the end of the range? */
if (cur->type == XML_TEXT_NODE) {
const xmlChar *content = cur->content;
int len;
if (content == NULL) {
tmp = xmlNewDocTextLen(ctxt->doc, NULL, 0);
} else {
len = index2;
if ((cur == start) && (index1 > 1)) {
content += (index1 - 1);
len -= (index1 - 1);
} else {
len = index2;
}
tmp = xmlNewDocTextLen(ctxt->doc, content, len);
}
/* single sub text node selection */
if (list == NULL)
return(tmp);
/* prune and return full set */
if (level == lastLevel)
xmlAddNextSibling(last, tmp);
else
xmlAddChild(last, tmp);
return(list);
} else { /* ending node not a text node */
endLevel = level; /* remember the level of the end node */
endFlag = 1;
/* last node - need to take care of properties + namespaces */
tmp = xmlDocCopyNode(cur, ctxt->doc, 2);
if (list == NULL) {
list = tmp;
listParent = cur->parent;
last = tmp;
} else {
if (level == lastLevel)
last = xmlAddNextSibling(last, tmp);
else {
last = xmlAddChild(last, tmp);
lastLevel = level;
}
}
if (index2 > 1) {
end = xmlXIncludeGetNthChild(cur, index2 - 1);
index2 = 0;
}
if ((cur == start) && (index1 > 1)) {
cur = xmlXIncludeGetNthChild(cur, index1 - 1);
index1 = 0;
} else {
cur = cur->children;
}
level++; /* increment level to show change */
/*
* Now gather the remaining nodes from cur to end
*/
continue; /* while */
}
} else if (cur == start) { /* Not at the end, are we at start? */
if ((cur->type == XML_TEXT_NODE) ||
(cur->type == XML_CDATA_SECTION_NODE)) {
const xmlChar *content = cur->content;
if (content == NULL) {
tmp = xmlNewDocTextLen(ctxt->doc, NULL, 0);
} else {
if (index1 > 1) {
content += (index1 - 1);
index1 = 0;
}
tmp = xmlNewDocText(ctxt->doc, content);
}
last = list = tmp;
listParent = cur->parent;
} else { /* Not text node */
/*
* start of the range - need to take care of
* properties and namespaces
*/
tmp = xmlDocCopyNode(cur, ctxt->doc, 2);
list = last = tmp;
listParent = cur->parent;
if (index1 > 1) { /* Do we need to position? */
cur = xmlXIncludeGetNthChild(cur, index1 - 1);
level = lastLevel = 1;
index1 = 0;
/*
* Now gather the remaining nodes from cur to end
*/
continue; /* while */
}
}
} else {
tmp = NULL;
switch (cur->type) {
case XML_DTD_NODE:
case XML_ELEMENT_DECL:
case XML_ATTRIBUTE_DECL:
case XML_ENTITY_NODE:
/* Do not copy DTD information */
break;
case XML_ENTITY_DECL:
/* handle crossing entities -> stack needed */
break;
case XML_XINCLUDE_START:
case XML_XINCLUDE_END:
/* don't consider it part of the tree content */
break;
case XML_ATTRIBUTE_NODE:
/* Humm, should not happen ! */
break;
default:
/*
* Middle of the range - need to take care of
* properties and namespaces
*/
tmp = xmlDocCopyNode(cur, ctxt->doc, 2);
break;
}
if (tmp != NULL) {
if (level == lastLevel)
last = xmlAddNextSibling(last, tmp);
else {
last = xmlAddChild(last, tmp);
lastLevel = level;
}
}
}
/*
* Skip to next node in document order
*/
cur = xmlXPtrAdvanceNode(cur, &level);
if (endFlag && (level >= endLevel))
break;
}
return(list);
}
#endif /* LIBXML_XPTR_LOCS_ENABLED */
#ifdef LIBXML_XPTR_ENABLED
/**
* xmlXIncludeCopyXPointer:
* @ctxt: the XInclude context
* @obj: the XPointer result from the evaluation.
*
* Build a node list tree copy of the XPointer result.
* This will drop Attributes and Namespace declarations.
*
* Returns an xmlNodePtr list or NULL.
* the caller has to free the node tree.
*/
static xmlNodePtr
xmlXIncludeCopyXPointer(xmlXIncludeCtxtPtr ctxt, xmlXPathObjectPtr obj,
const xmlChar *targetBase) {
xmlNodePtr list = NULL, last = NULL, copy;
int i;
if ((ctxt == NULL) || (obj == NULL))
return(NULL);
switch (obj->type) {
case XPATH_NODESET: {
xmlNodeSetPtr set = obj->nodesetval;
if (set == NULL)
break;
for (i = 0;i < set->nodeNr;i++) {
xmlNodePtr node;
if (set->nodeTab[i] == NULL)
continue;
switch (set->nodeTab[i]->type) {
case XML_DOCUMENT_NODE:
case XML_HTML_DOCUMENT_NODE:
node = xmlDocGetRootElement(
(xmlDocPtr) set->nodeTab[i]);
if (node == NULL) {
xmlXIncludeErr(ctxt, set->nodeTab[i],
XML_ERR_INTERNAL_ERROR,
"document without root\n", NULL);
continue;
}
break;
case XML_TEXT_NODE:
case XML_CDATA_SECTION_NODE:
case XML_ELEMENT_NODE:
case XML_PI_NODE:
case XML_COMMENT_NODE:
node = set->nodeTab[i];
break;
default:
xmlXIncludeErr(ctxt, set->nodeTab[i],
XML_XINCLUDE_XPTR_RESULT,
"invalid node type in XPtr result\n",
NULL);
continue; /* for */
}
/*
* OPTIMIZE TODO: External documents should already be
* expanded, so xmlDocCopyNode should work as well.
* xmlXIncludeCopyNode is only required for the initial
* document.
*/
copy = xmlXIncludeCopyNode(ctxt, node, 0, targetBase);
if (copy == NULL) {
xmlFreeNodeList(list);
return(NULL);
}
if (last == NULL) {
list = copy;
} else {
while (last->next != NULL)
last = last->next;
copy->prev = last;
last->next = copy;
}
last = copy;
}
break;
}
#ifdef LIBXML_XPTR_LOCS_ENABLED
case XPATH_LOCATIONSET: {
xmlLocationSetPtr set = (xmlLocationSetPtr) obj->user;
if (set == NULL)
return(NULL);
for (i = 0;i < set->locNr;i++) {
if (last == NULL)
list = last = xmlXIncludeCopyXPointer(ctxt,
set->locTab[i],
targetBase);
else
xmlAddNextSibling(last,
xmlXIncludeCopyXPointer(ctxt, set->locTab[i],
targetBase));
if (last != NULL) {
while (last->next != NULL)
last = last->next;
}
}
break;
}
case XPATH_RANGE:
return(xmlXIncludeCopyRange(ctxt, obj));
case XPATH_POINT:
/* points are ignored in XInclude */
break;
#endif
default:
break;
}
return(list);
}
#endif
/************************************************************************
* *
* XInclude I/O handling *
* *
************************************************************************/
typedef struct _xmlXIncludeMergeData xmlXIncludeMergeData;
typedef xmlXIncludeMergeData *xmlXIncludeMergeDataPtr;
struct _xmlXIncludeMergeData {
xmlDocPtr doc;
xmlXIncludeCtxtPtr ctxt;
};
/**
* xmlXIncludeMergeOneEntity:
* @ent: the entity
* @doc: the including doc
* @name: the entity name
*
* Implements the merge of one entity
*/
static void
xmlXIncludeMergeEntity(void *payload, void *vdata,
const xmlChar *name ATTRIBUTE_UNUSED) {
xmlEntityPtr ent = (xmlEntityPtr) payload;
xmlXIncludeMergeDataPtr data = (xmlXIncludeMergeDataPtr) vdata;
xmlEntityPtr ret, prev;
xmlDocPtr doc;
xmlXIncludeCtxtPtr ctxt;
if ((ent == NULL) || (data == NULL))
return;
ctxt = data->ctxt;
doc = data->doc;
if ((ctxt == NULL) || (doc == NULL))
return;
switch (ent->etype) {
case XML_INTERNAL_PARAMETER_ENTITY:
case XML_EXTERNAL_PARAMETER_ENTITY:
case XML_INTERNAL_PREDEFINED_ENTITY:
return;
case XML_INTERNAL_GENERAL_ENTITY:
case XML_EXTERNAL_GENERAL_PARSED_ENTITY:
case XML_EXTERNAL_GENERAL_UNPARSED_ENTITY:
break;
}
prev = xmlGetDocEntity(doc, ent->name);
if (prev == NULL) {
ret = xmlAddDocEntity(doc, ent->name, ent->etype, ent->ExternalID,
ent->SystemID, ent->content);
if (ret == NULL) {
xmlXIncludeErrMemory(ctxt);
return;
}
if (ent->URI != NULL) {
ret->URI = xmlStrdup(ent->URI);
if (ret->URI == 0)
xmlXIncludeErrMemory(ctxt);
}
} else {
if (ent->etype != prev->etype)
goto error;
if ((ent->SystemID != NULL) && (prev->SystemID != NULL)) {
if (!xmlStrEqual(ent->SystemID, prev->SystemID))
goto error;
} else if ((ent->ExternalID != NULL) &&
(prev->ExternalID != NULL)) {
if (!xmlStrEqual(ent->ExternalID, prev->ExternalID))
goto error;
} else if ((ent->content != NULL) && (prev->content != NULL)) {
if (!xmlStrEqual(ent->content, prev->content))
goto error;
} else {
goto error;
}
}
return;
error:
switch (ent->etype) {
case XML_INTERNAL_PARAMETER_ENTITY:
case XML_EXTERNAL_PARAMETER_ENTITY:
case XML_INTERNAL_PREDEFINED_ENTITY:
case XML_INTERNAL_GENERAL_ENTITY:
case XML_EXTERNAL_GENERAL_PARSED_ENTITY:
return;
case XML_EXTERNAL_GENERAL_UNPARSED_ENTITY:
break;
}
xmlXIncludeErr(ctxt, (xmlNodePtr) ent, XML_XINCLUDE_ENTITY_DEF_MISMATCH,
"mismatch in redefinition of entity %s\n",
ent->name);
}
/**
* xmlXIncludeMergeEntities:
* @ctxt: an XInclude context
* @doc: the including doc
* @from: the included doc
*
* Implements the entity merge
*
* Returns 0 if merge succeeded, -1 if some processing failed
*/
static int
xmlXIncludeMergeEntities(xmlXIncludeCtxtPtr ctxt, xmlDocPtr doc,
xmlDocPtr from) {
xmlNodePtr cur;
xmlDtdPtr target, source;
if (ctxt == NULL)
return(-1);
if ((from == NULL) || (from->intSubset == NULL))
return(0);
target = doc->intSubset;
if (target == NULL) {
cur = xmlDocGetRootElement(doc);
if (cur == NULL)
return(-1);
target = xmlCreateIntSubset(doc, cur->name, NULL, NULL);
if (target == NULL) {
xmlXIncludeErrMemory(ctxt);
return(-1);
}
}
source = from->intSubset;
if ((source != NULL) && (source->entities != NULL)) {
xmlXIncludeMergeData data;
data.ctxt = ctxt;
data.doc = doc;
xmlHashScan((xmlHashTablePtr) source->entities,
xmlXIncludeMergeEntity, &data);
}
source = from->extSubset;
if ((source != NULL) && (source->entities != NULL)) {
xmlXIncludeMergeData data;
data.ctxt = ctxt;
data.doc = doc;
/*
* don't duplicate existing stuff when external subsets are the same
*/
if ((!xmlStrEqual(target->ExternalID, source->ExternalID)) &&
(!xmlStrEqual(target->SystemID, source->SystemID))) {
xmlHashScan((xmlHashTablePtr) source->entities,
xmlXIncludeMergeEntity, &data);
}
}
return(0);
}
/**
* xmlXIncludeLoadDoc:
* @ctxt: the XInclude context
* @url: the associated URL
* @ref: an XMLXincludeRefPtr
*
* Load the document, and store the result in the XInclude context
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
xmlXIncludeLoadDoc(xmlXIncludeCtxtPtr ctxt, xmlXIncludeRefPtr ref) {
xmlXIncludeDocPtr cache;
xmlDocPtr doc;
const xmlChar *url = ref->URI;
const xmlChar *fragment = ref->fragment;
int i = 0;
int ret = -1;
int cacheNr;
#ifdef LIBXML_XPTR_ENABLED
int saveFlags;
#endif
/*
* Handling of references to the local document are done
* directly through ctxt->doc.
*/
if ((url[0] == 0) || (url[0] == '#') ||
((ctxt->doc != NULL) && (xmlStrEqual(url, ctxt->doc->URL)))) {
doc = ctxt->doc;
goto loaded;
}
/*
* Prevent reloading the document twice.
*/
for (i = 0; i < ctxt->urlNr; i++) {
if (xmlStrEqual(url, ctxt->urlTab[i].url)) {
if (ctxt->urlTab[i].expanding) {
xmlXIncludeErr(ctxt, ref->elem, XML_XINCLUDE_RECURSION,
"inclusion loop detected\n", NULL);
goto error;
}
doc = ctxt->urlTab[i].doc;
if (doc == NULL)
goto error;
goto loaded;
}
}
/*
* Load it.
*/
#ifdef LIBXML_XPTR_ENABLED
/*
* If this is an XPointer evaluation, we want to assure that
* all entities have been resolved prior to processing the
* referenced document
*/
saveFlags = ctxt->parseFlags;
if (fragment != NULL) { /* if this is an XPointer eval */
ctxt->parseFlags |= XML_PARSE_NOENT;
}
#endif
doc = xmlXIncludeParseFile(ctxt, (const char *)url);
#ifdef LIBXML_XPTR_ENABLED
ctxt->parseFlags = saveFlags;
#endif
/* Also cache NULL docs */
if (ctxt->urlNr >= ctxt->urlMax) {
xmlXIncludeDoc *tmp;
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
size_t newSize = ctxt->urlMax ? ctxt->urlMax * 2 : 1;
#else
size_t newSize = ctxt->urlMax ? ctxt->urlMax * 2 : 8;
#endif
tmp = xmlRealloc(ctxt->urlTab, sizeof(xmlXIncludeDoc) * newSize);
if (tmp == NULL) {
xmlXIncludeErrMemory(ctxt);
xmlFreeDoc(doc);
goto error;
}
ctxt->urlMax = newSize;
ctxt->urlTab = tmp;
}
cache = &ctxt->urlTab[ctxt->urlNr];
cache->doc = doc;
cache->url = xmlStrdup(url);
if (cache->url == NULL) {
xmlXIncludeErrMemory(ctxt);
xmlFreeDoc(doc);
goto error;
}
cache->expanding = 0;
cacheNr = ctxt->urlNr++;
if (doc == NULL)
goto error;
/*
* It's possible that the requested URL has been mapped to a
* completely different location (e.g. through a catalog entry).
* To check for this, we compare the URL with that of the doc
* and change it if they disagree (bug 146988).
*/
if ((doc->URL != NULL) && (!xmlStrEqual(url, doc->URL)))
url = doc->URL;
/*
* Make sure we have all entities fixed up
*/
xmlXIncludeMergeEntities(ctxt, ctxt->doc, doc);
/*
* We don't need the DTD anymore, free up space
if (doc->intSubset != NULL) {
xmlUnlinkNode((xmlNodePtr) doc->intSubset);
xmlFreeNode((xmlNodePtr) doc->intSubset);
doc->intSubset = NULL;
}
if (doc->extSubset != NULL) {
xmlUnlinkNode((xmlNodePtr) doc->extSubset);
xmlFreeNode((xmlNodePtr) doc->extSubset);
doc->extSubset = NULL;
}
*/
cache->expanding = 1;
xmlXIncludeRecurseDoc(ctxt, doc);
/* urlTab might be reallocated. */
cache = &ctxt->urlTab[cacheNr];
cache->expanding = 0;
loaded:
if (fragment == NULL) {
xmlNodePtr root;
root = xmlDocGetRootElement(doc);
if (root == NULL) {
xmlXIncludeErr(ctxt, ref->elem, XML_ERR_INTERNAL_ERROR,
"document without root\n", NULL);
goto error;
}
ref->inc = xmlDocCopyNode(root, ctxt->doc, 1);
if (ref->inc == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
if (ref->base != NULL)
xmlXIncludeBaseFixup(ctxt, root, ref->inc, ref->base);
}
#ifdef LIBXML_XPTR_ENABLED
else {
/*
* Computes the XPointer expression and make a copy used
* as the replacement copy.
*/
xmlXPathObjectPtr xptr;
xmlNodeSetPtr set;
if (ctxt->isStream && doc == ctxt->doc) {
xmlXIncludeErr(ctxt, ref->elem, XML_XINCLUDE_XPTR_FAILED,
"XPointer expressions not allowed in streaming"
" mode\n", NULL);
goto error;
}
if (ctxt->xpctxt == NULL) {
ctxt->xpctxt = xmlXPtrNewContext(doc, NULL, NULL);
if (ctxt->xpctxt == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
if (ctxt->errorHandler != NULL)
xmlXPathSetErrorHandler(ctxt->xpctxt, ctxt->errorHandler,
ctxt->errorCtxt);
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
ctxt->xpctxt->opLimit = 100000;
#endif
}
xptr = xmlXPtrEval(fragment, ctxt->xpctxt);
if (xptr == NULL) {
if (ctxt->xpctxt->lastError.code == XML_ERR_NO_MEMORY)
xmlXIncludeErrMemory(ctxt);
else
xmlXIncludeErr(ctxt, ref->elem, XML_XINCLUDE_XPTR_FAILED,
"XPointer evaluation failed: #%s\n",
fragment);
goto error;
}
switch (xptr->type) {
case XPATH_UNDEFINED:
case XPATH_BOOLEAN:
case XPATH_NUMBER:
case XPATH_STRING:
#ifdef LIBXML_XPTR_LOCS_ENABLED
case XPATH_POINT:
#endif
case XPATH_USERS:
case XPATH_XSLT_TREE:
xmlXIncludeErr(ctxt, ref->elem, XML_XINCLUDE_XPTR_RESULT,
"XPointer is not a range: #%s\n",
fragment);
xmlXPathFreeObject(xptr);
goto error;
case XPATH_NODESET:
break;
#ifdef LIBXML_XPTR_LOCS_ENABLED
case XPATH_RANGE:
case XPATH_LOCATIONSET:
break;
#endif
}
set = xptr->nodesetval;
if (set != NULL) {
for (i = 0;i < set->nodeNr;i++) {
if (set->nodeTab[i] == NULL)
continue;
switch (set->nodeTab[i]->type) {
case XML_ELEMENT_NODE:
case XML_TEXT_NODE:
case XML_CDATA_SECTION_NODE:
case XML_ENTITY_REF_NODE:
case XML_ENTITY_NODE:
case XML_PI_NODE:
case XML_COMMENT_NODE:
case XML_DOCUMENT_NODE:
case XML_HTML_DOCUMENT_NODE:
continue;
case XML_ATTRIBUTE_NODE:
xmlXIncludeErr(ctxt, ref->elem,
XML_XINCLUDE_XPTR_RESULT,
"XPointer selects an attribute: #%s\n",
fragment);
set->nodeTab[i] = NULL;
continue;
case XML_NAMESPACE_DECL:
xmlXIncludeErr(ctxt, ref->elem,
XML_XINCLUDE_XPTR_RESULT,
"XPointer selects a namespace: #%s\n",
fragment);
set->nodeTab[i] = NULL;
continue;
case XML_DOCUMENT_TYPE_NODE:
case XML_DOCUMENT_FRAG_NODE:
case XML_NOTATION_NODE:
case XML_DTD_NODE:
case XML_ELEMENT_DECL:
case XML_ATTRIBUTE_DECL:
case XML_ENTITY_DECL:
case XML_XINCLUDE_START:
case XML_XINCLUDE_END:
xmlXIncludeErr(ctxt, ref->elem,
XML_XINCLUDE_XPTR_RESULT,
"XPointer selects unexpected nodes: #%s\n",
fragment);
set->nodeTab[i] = NULL;
set->nodeTab[i] = NULL;
continue; /* for */
}
}
}
ref->inc = xmlXIncludeCopyXPointer(ctxt, xptr, ref->base);
xmlXPathFreeObject(xptr);
}
#endif
ret = 0;
error:
return(ret);
}
/**
* xmlXIncludeLoadTxt:
* @ctxt: the XInclude context
* @ref: an XMLXincludeRefPtr
*
* Load the content, and store the result in the XInclude context
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
xmlXIncludeLoadTxt(xmlXIncludeCtxtPtr ctxt, xmlXIncludeRefPtr ref) {
xmlParserInputBufferPtr buf;
xmlNodePtr node = NULL;
const xmlChar *url = ref->URI;
int i;
int ret = -1;
xmlChar *encoding = NULL;
xmlCharEncodingHandlerPtr handler = NULL;
xmlParserCtxtPtr pctxt = NULL;
xmlParserInputPtr inputStream = NULL;
int len;
int res;
const xmlChar *content;
/*
* Handling of references to the local document are done
* directly through ctxt->doc.
*/
if (url[0] == 0) {
xmlXIncludeErr(ctxt, ref->elem, XML_XINCLUDE_TEXT_DOCUMENT,
"text serialization of document not available\n", NULL);
goto error;
}
/*
* Prevent reloading the document twice.
*/
for (i = 0; i < ctxt->txtNr; i++) {
if (xmlStrEqual(url, ctxt->txtTab[i].url)) {
node = xmlNewDocText(ctxt->doc, ctxt->txtTab[i].text);
if (node == NULL)
xmlXIncludeErrMemory(ctxt);
goto loaded;
}
}
/*
* Try to get the encoding if available
*/
if (ref->elem != NULL) {
encoding = xmlXIncludeGetProp(ctxt, ref->elem, XINCLUDE_PARSE_ENCODING);
}
if (encoding != NULL) {
res = xmlOpenCharEncodingHandler((const char *) encoding,
/* output */ 0, &handler);
if (res != 0) {
if (res == XML_ERR_NO_MEMORY) {
xmlXIncludeErrMemory(ctxt);
} else if (res == XML_ERR_UNSUPPORTED_ENCODING) {
xmlXIncludeErr(ctxt, ref->elem, XML_XINCLUDE_UNKNOWN_ENCODING,
"encoding %s not supported\n", encoding);
goto error;
} else {
xmlXIncludeErr(ctxt, ref->elem, res,
"unexpected error from iconv or ICU\n", NULL);
goto error;
}
}
}
/*
* Load it.
*/
pctxt = xmlNewParserCtxt();
if (pctxt == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
inputStream = xmlLoadExternalEntity((const char*)url, NULL, pctxt);
if (inputStream == NULL) {
if (pctxt->errNo == XML_ERR_NO_MEMORY)
xmlXIncludeErrMemory(ctxt);
else
xmlXIncludeErr(ctxt, NULL, pctxt->errNo, "load error", NULL);
goto error;
}
buf = inputStream->buf;
if (buf == NULL)
goto error;
if (buf->encoder)
xmlCharEncCloseFunc(buf->encoder);
buf->encoder = handler;
handler = NULL;
node = xmlNewDocText(ctxt->doc, NULL);
if (node == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
/*
* Scan all chars from the resource and add the to the node
*/
do {
res = xmlParserInputBufferRead(buf, 4096);
} while (res > 0);
if (res < 0) {
if (buf->error == XML_ERR_NO_MEMORY)
xmlXIncludeErrMemory(ctxt);
else
xmlXIncludeErr(ctxt, NULL, buf->error, "read error", NULL);
goto error;
}
content = xmlBufContent(buf->buffer);
len = xmlBufLength(buf->buffer);
for (i = 0; i < len;) {
int cur;
int l;
l = len - i;
cur = xmlGetUTF8Char(&content[i], &l);
if ((cur < 0) || (!IS_CHAR(cur))) {
xmlXIncludeErr(ctxt, ref->elem, XML_XINCLUDE_INVALID_CHAR,
"%s contains invalid char\n", url);
goto error;
}
i += l;
}
if (xmlNodeAddContentLen(node, content, len) < 0)
xmlXIncludeErrMemory(ctxt);
if (ctxt->txtNr >= ctxt->txtMax) {
xmlXIncludeTxt *tmp;
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
size_t newSize = ctxt->txtMax ? ctxt->txtMax * 2 : 1;
#else
size_t newSize = ctxt->txtMax ? ctxt->txtMax * 2 : 8;
#endif
tmp = xmlRealloc(ctxt->txtTab, sizeof(xmlXIncludeTxt) * newSize);
if (tmp == NULL) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
ctxt->txtMax = newSize;
ctxt->txtTab = tmp;
}
ctxt->txtTab[ctxt->txtNr].text = xmlStrdup(node->content);
if ((node->content != NULL) &&
(ctxt->txtTab[ctxt->txtNr].text == NULL)) {
xmlXIncludeErrMemory(ctxt);
goto error;
}
ctxt->txtTab[ctxt->txtNr].url = xmlStrdup(url);
if (ctxt->txtTab[ctxt->txtNr].url == NULL) {
xmlXIncludeErrMemory(ctxt);
xmlFree(ctxt->txtTab[ctxt->txtNr].text);
goto error;
}
ctxt->txtNr++;
loaded:
/*
* Add the element as the replacement copy.
*/
ref->inc = node;
node = NULL;
ret = 0;
error:
xmlFreeNode(node);
xmlFreeInputStream(inputStream);
xmlFreeParserCtxt(pctxt);
xmlCharEncCloseFunc(handler);
xmlFree(encoding);
return(ret);
}
/**
* xmlXIncludeLoadFallback:
* @ctxt: the XInclude context
* @fallback: the fallback node
* @ref: an XMLXincludeRefPtr
*
* Load the content of the fallback node, and store the result
* in the XInclude context
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
xmlXIncludeLoadFallback(xmlXIncludeCtxtPtr ctxt, xmlNodePtr fallback,
xmlXIncludeRefPtr ref) {
int ret = 0;
int oldNbErrors;
if ((fallback == NULL) || (fallback->type == XML_NAMESPACE_DECL) ||
(ctxt == NULL))
return(-1);
if (fallback->children != NULL) {
/*
* It's possible that the fallback also has 'includes'
* (Bug 129969), so we re-process the fallback just in case
*/
oldNbErrors = ctxt->nbErrors;
ref->inc = xmlXIncludeCopyNode(ctxt, fallback, 1, ref->base);
if (ctxt->nbErrors > oldNbErrors)
ret = -1;
} else {
ref->inc = NULL;
}
ref->fallback = 1;
return(ret);
}
/************************************************************************
* *
* XInclude Processing *
* *
************************************************************************/
/**
* xmlXIncludeExpandNode:
* @ctxt: an XInclude context
* @node: an XInclude node
*
* If the XInclude node wasn't processed yet, create a new RefPtr,
* add it to ctxt->incTab and load the included items.
*
* Returns the new or existing xmlXIncludeRefPtr, or NULL in case of error.
*/
static xmlXIncludeRefPtr
xmlXIncludeExpandNode(xmlXIncludeCtxtPtr ctxt, xmlNodePtr node) {
xmlXIncludeRefPtr ref;
int i;
if (ctxt->fatalErr)
return(NULL);
if (ctxt->depth >= XINCLUDE_MAX_DEPTH) {
xmlXIncludeErr(ctxt, node, XML_XINCLUDE_RECURSION,
"maximum recursion depth exceeded\n", NULL);
ctxt->fatalErr = 1;
return(NULL);
}
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
/*
* The XInclude engine offers no protection against exponential
* expansion attacks similar to "billion laughs". Avoid timeouts by
* limiting the total number of replacements when fuzzing.
*
* Unfortuately, a single XInclude can already result in quadratic
* behavior:
*
* <doc xmlns:xi="http://www.w3.org/2001/XInclude">
* <xi:include xpointer="xpointer(//e)"/>
* <e>
* <e>
* <e>
* <!-- more nested elements -->
* </e>
* </e>
* </e>
* </doc>
*/
if (ctxt->incTotal >= 20)
return(NULL);
ctxt->incTotal++;
#endif
for (i = 0; i < ctxt->incNr; i++) {
if (ctxt->incTab[i]->elem == node) {
if (ctxt->incTab[i]->expanding) {
xmlXIncludeErr(ctxt, node, XML_XINCLUDE_RECURSION,
"inclusion loop detected\n", NULL);
return(NULL);
}
return(ctxt->incTab[i]);
}
}
ref = xmlXIncludeAddNode(ctxt, node);
if (ref == NULL)
return(NULL);
ref->expanding = 1;
ctxt->depth++;
xmlXIncludeLoadNode(ctxt, ref);
ctxt->depth--;
ref->expanding = 0;
return(ref);
}
/**
* xmlXIncludeLoadNode:
* @ctxt: an XInclude context
* @ref: an xmlXIncludeRefPtr
*
* Find and load the infoset replacement for the given node.
*
* Returns 0 if substitution succeeded, -1 if some processing failed
*/
static int
xmlXIncludeLoadNode(xmlXIncludeCtxtPtr ctxt, xmlXIncludeRefPtr ref) {
xmlNodePtr cur;
int ret;
if ((ctxt == NULL) || (ref == NULL))
return(-1);
cur = ref->elem;
if (cur == NULL)
return(-1);
if (ref->xml) {
ret = xmlXIncludeLoadDoc(ctxt, ref);
/* xmlXIncludeGetFragment(ctxt, cur, URI); */
} else {
ret = xmlXIncludeLoadTxt(ctxt, ref);
}
if (ret < 0) {
xmlNodePtr children;
/*
* Time to try a fallback if available
*/
children = cur->children;
while (children != NULL) {
if ((children->type == XML_ELEMENT_NODE) &&
(children->ns != NULL) &&
(xmlStrEqual(children->name, XINCLUDE_FALLBACK)) &&
((xmlStrEqual(children->ns->href, XINCLUDE_NS)) ||
(xmlStrEqual(children->ns->href, XINCLUDE_OLD_NS)))) {
ret = xmlXIncludeLoadFallback(ctxt, children, ref);
break;
}
children = children->next;
}
}
if (ret < 0) {
xmlXIncludeErr(ctxt, cur, XML_XINCLUDE_NO_FALLBACK,
"could not load %s, and no fallback was found\n",
ref->URI);
}
return(0);
}
/**
* xmlXIncludeIncludeNode:
* @ctxt: an XInclude context
* @ref: an xmlXIncludeRefPtr
*
* Implement the infoset replacement for the given node
*
* Returns 0 if substitution succeeded, -1 if some processing failed
*/
static int
xmlXIncludeIncludeNode(xmlXIncludeCtxtPtr ctxt, xmlXIncludeRefPtr ref) {
xmlNodePtr cur, end, list, tmp;
if ((ctxt == NULL) || (ref == NULL))
return(-1);
cur = ref->elem;
if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL))
return(-1);
list = ref->inc;
ref->inc = NULL;
/*
* Check against the risk of generating a multi-rooted document
*/
if ((cur->parent != NULL) &&
(cur->parent->type != XML_ELEMENT_NODE)) {
int nb_elem = 0;
tmp = list;
while (tmp != NULL) {
if (tmp->type == XML_ELEMENT_NODE)
nb_elem++;
tmp = tmp->next;
}
if (nb_elem > 1) {
xmlXIncludeErr(ctxt, ref->elem, XML_XINCLUDE_MULTIPLE_ROOT,
"XInclude error: would result in multiple root nodes\n",
NULL);
xmlFreeNodeList(list);
return(-1);
}
}
if (ctxt->parseFlags & XML_PARSE_NOXINCNODE) {
/*
* Add the list of nodes
*
* TODO: Coalesce text nodes unless we are streaming mode.
*/
while (list != NULL) {
end = list;
list = list->next;
if (xmlAddPrevSibling(cur, end) == NULL) {
xmlUnlinkNode(end);
xmlFreeNode(end);
goto err_memory;
}
}
xmlUnlinkNode(cur);
xmlFreeNode(cur);
} else {
xmlNodePtr child, next;
/*
* Change the current node as an XInclude start one, and add an
* XInclude end one
*/
if (ref->fallback)
xmlUnsetProp(cur, BAD_CAST "href");
cur->type = XML_XINCLUDE_START;
/* Remove fallback children */
for (child = cur->children; child != NULL; child = next) {
next = child->next;
xmlUnlinkNode(child);
xmlFreeNode(child);
}
end = xmlNewDocNode(cur->doc, cur->ns, cur->name, NULL);
if (end == NULL)
goto err_memory;
end->type = XML_XINCLUDE_END;
if (xmlAddNextSibling(cur, end) == NULL) {
xmlFreeNode(end);
goto err_memory;
}
/*
* Add the list of nodes
*/
while (list != NULL) {
cur = list;
list = list->next;
if (xmlAddPrevSibling(end, cur) == NULL) {
xmlUnlinkNode(cur);
xmlFreeNode(cur);
goto err_memory;
}
}
}
return(0);
err_memory:
xmlXIncludeErrMemory(ctxt);
xmlFreeNodeList(list);
return(-1);
}
/**
* xmlXIncludeTestNode:
* @ctxt: the XInclude processing context
* @node: an XInclude node
*
* test if the node is an XInclude node
*
* Returns 1 true, 0 otherwise
*/
static int
xmlXIncludeTestNode(xmlXIncludeCtxtPtr ctxt, xmlNodePtr node) {
if (node == NULL)
return(0);
if (node->type != XML_ELEMENT_NODE)
return(0);
if (node->ns == NULL)
return(0);
if ((xmlStrEqual(node->ns->href, XINCLUDE_NS)) ||
(xmlStrEqual(node->ns->href, XINCLUDE_OLD_NS))) {
if (xmlStrEqual(node->ns->href, XINCLUDE_OLD_NS)) {
if (ctxt->legacy == 0) {
#if 0 /* wait for the XML Core Working Group to get something stable ! */
xmlXIncludeWarn(ctxt, node, XML_XINCLUDE_DEPRECATED_NS,
"Deprecated XInclude namespace found, use %s",
XINCLUDE_NS);
#endif
ctxt->legacy = 1;
}
}
if (xmlStrEqual(node->name, XINCLUDE_NODE)) {
xmlNodePtr child = node->children;
int nb_fallback = 0;
while (child != NULL) {
if ((child->type == XML_ELEMENT_NODE) &&
(child->ns != NULL) &&
((xmlStrEqual(child->ns->href, XINCLUDE_NS)) ||
(xmlStrEqual(child->ns->href, XINCLUDE_OLD_NS)))) {
if (xmlStrEqual(child->name, XINCLUDE_NODE)) {
xmlXIncludeErr(ctxt, node,
XML_XINCLUDE_INCLUDE_IN_INCLUDE,
"%s has an 'include' child\n",
XINCLUDE_NODE);
return(0);
}
if (xmlStrEqual(child->name, XINCLUDE_FALLBACK)) {
nb_fallback++;
}
}
child = child->next;
}
if (nb_fallback > 1) {
xmlXIncludeErr(ctxt, node, XML_XINCLUDE_FALLBACKS_IN_INCLUDE,
"%s has multiple fallback children\n",
XINCLUDE_NODE);
return(0);
}
return(1);
}
if (xmlStrEqual(node->name, XINCLUDE_FALLBACK)) {
if ((node->parent == NULL) ||
(node->parent->type != XML_ELEMENT_NODE) ||
(node->parent->ns == NULL) ||
((!xmlStrEqual(node->parent->ns->href, XINCLUDE_NS)) &&
(!xmlStrEqual(node->parent->ns->href, XINCLUDE_OLD_NS))) ||
(!xmlStrEqual(node->parent->name, XINCLUDE_NODE))) {
xmlXIncludeErr(ctxt, node,
XML_XINCLUDE_FALLBACK_NOT_IN_INCLUDE,
"%s is not the child of an 'include'\n",
XINCLUDE_FALLBACK);
}
}
}
return(0);
}
/**
* xmlXIncludeDoProcess:
* @ctxt: the XInclude processing context
* @tree: the top of the tree to process
*
* Implement the XInclude substitution on the XML document @doc
*
* Returns 0 if no substitution were done, -1 if some processing failed
* or the number of substitutions done.
*/
static int
xmlXIncludeDoProcess(xmlXIncludeCtxtPtr ctxt, xmlNodePtr tree) {
xmlXIncludeRefPtr ref;
xmlNodePtr cur;
int ret = 0;
int i, start;
/*
* First phase: lookup the elements in the document
*/
start = ctxt->incNr;
cur = tree;
do {
/* TODO: need to work on entities -> stack */
if (xmlXIncludeTestNode(ctxt, cur) == 1) {
ref = xmlXIncludeExpandNode(ctxt, cur);
/*
* Mark direct includes.
*/
if (ref != NULL)
ref->replace = 1;
} else if ((cur->children != NULL) &&
((cur->type == XML_DOCUMENT_NODE) ||
(cur->type == XML_ELEMENT_NODE))) {
cur = cur->children;
continue;
}
do {
if (cur == tree)
break;
if (cur->next != NULL) {
cur = cur->next;
break;
}
cur = cur->parent;
} while (cur != NULL);
} while ((cur != NULL) && (cur != tree));
/*
* Second phase: extend the original document infoset.
*/
for (i = start; i < ctxt->incNr; i++) {
if (ctxt->incTab[i]->replace != 0) {
xmlXIncludeIncludeNode(ctxt, ctxt->incTab[i]);
ctxt->incTab[i]->replace = 0;
} else {
/*
* Ignore includes which were added indirectly, for example
* inside xi:fallback elements.
*/
if (ctxt->incTab[i]->inc != NULL) {
xmlFreeNodeList(ctxt->incTab[i]->inc);
ctxt->incTab[i]->inc = NULL;
}
}
ret++;
}
if (ctxt->isStream) {
/*
* incTab references nodes which will eventually be deleted in
* streaming mode. The table is only required for XPointer
* expressions which aren't allowed in streaming mode.
*/
for (i = 0;i < ctxt->incNr;i++) {
xmlXIncludeFreeRef(ctxt->incTab[i]);
}
ctxt->incNr = 0;
}
return(ret);
}
/**
* xmlXIncludeDoProcessRoot:
* @ctxt: the XInclude processing context
* @tree: the top of the tree to process
*
* Implement the XInclude substitution on the XML document @doc
*
* Returns 0 if no substitution were done, -1 if some processing failed
* or the number of substitutions done.
*/
static int
xmlXIncludeDoProcessRoot(xmlXIncludeCtxtPtr ctxt, xmlNodePtr tree) {
if ((tree == NULL) || (tree->type == XML_NAMESPACE_DECL))
return(-1);
if (ctxt == NULL)
return(-1);
return(xmlXIncludeDoProcess(ctxt, tree));
}
/**
* xmlXIncludeGetLastError:
* @ctxt: an XInclude processing context
*
* Available since 2.13.0.
*
* Returns the last error code.
*/
int
xmlXIncludeGetLastError(xmlXIncludeCtxtPtr ctxt) {
if (ctxt == NULL)
return(XML_ERR_ARGUMENT);
return(ctxt->errNo);
}
/**
* xmlXIncludeSetErrorHandler:
* @ctxt: an XInclude processing context
* @handler: error handler
* @data: user data which will be passed to the handler
*
* Register a callback function that will be called on errors and
* warnings. If handler is NULL, the error handler will be deactivated.
*
* Available since 2.13.0.
*/
void
xmlXIncludeSetErrorHandler(xmlXIncludeCtxtPtr ctxt,
xmlStructuredErrorFunc handler, void *data) {
if (ctxt == NULL)
return;
ctxt->errorHandler = handler;
ctxt->errorCtxt = data;
}
/**
* xmlXIncludeSetFlags:
* @ctxt: an XInclude processing context
* @flags: a set of xmlParserOption used for parsing XML includes
*
* Set the flags used for further processing of XML resources.
*
* Returns 0 in case of success and -1 in case of error.
*/
int
xmlXIncludeSetFlags(xmlXIncludeCtxtPtr ctxt, int flags) {
if (ctxt == NULL)
return(-1);
ctxt->parseFlags = flags;
return(0);
}
/**
* xmlXIncludeSetStreamingMode:
* @ctxt: an XInclude processing context
* @mode: whether streaming mode should be enabled
*
* In streaming mode, XPointer expressions aren't allowed.
*
* Returns 0 in case of success and -1 in case of error.
*/
int
xmlXIncludeSetStreamingMode(xmlXIncludeCtxtPtr ctxt, int mode) {
if (ctxt == NULL)
return(-1);
ctxt->isStream = !!mode;
return(0);
}
/**
* xmlXIncludeProcessTreeFlagsData:
* @tree: an XML node
* @flags: a set of xmlParserOption used for parsing XML includes
* @data: application data that will be passed to the parser context
* in the _private field of the parser context(s)
*
* Implement the XInclude substitution on the XML node @tree
*
* Returns 0 if no substitution were done, -1 if some processing failed
* or the number of substitutions done.
*/
int
xmlXIncludeProcessTreeFlagsData(xmlNodePtr tree, int flags, void *data) {
xmlXIncludeCtxtPtr ctxt;
int ret = 0;
if ((tree == NULL) || (tree->type == XML_NAMESPACE_DECL) ||
(tree->doc == NULL))
return(-1);
ctxt = xmlXIncludeNewContext(tree->doc);
if (ctxt == NULL)
return(-1);
ctxt->_private = data;
xmlXIncludeSetFlags(ctxt, flags);
ret = xmlXIncludeDoProcessRoot(ctxt, tree);
if ((ret >= 0) && (ctxt->nbErrors > 0))
ret = -1;
xmlXIncludeFreeContext(ctxt);
return(ret);
}
/**
* xmlXIncludeProcessFlagsData:
* @doc: an XML document
* @flags: a set of xmlParserOption used for parsing XML includes
* @data: application data that will be passed to the parser context
* in the _private field of the parser context(s)
*
* Implement the XInclude substitution on the XML document @doc
*
* Returns 0 if no substitution were done, -1 if some processing failed
* or the number of substitutions done.
*/
int
xmlXIncludeProcessFlagsData(xmlDocPtr doc, int flags, void *data) {
xmlNodePtr tree;
if (doc == NULL)
return(-1);
tree = xmlDocGetRootElement(doc);
if (tree == NULL)
return(-1);
return(xmlXIncludeProcessTreeFlagsData(tree, flags, data));
}
/**
* xmlXIncludeProcessFlags:
* @doc: an XML document
* @flags: a set of xmlParserOption used for parsing XML includes
*
* Implement the XInclude substitution on the XML document @doc
*
* Returns 0 if no substitution were done, -1 if some processing failed
* or the number of substitutions done.
*/
int
xmlXIncludeProcessFlags(xmlDocPtr doc, int flags) {
return xmlXIncludeProcessFlagsData(doc, flags, NULL);
}
/**
* xmlXIncludeProcess:
* @doc: an XML document
*
* Implement the XInclude substitution on the XML document @doc
*
* Returns 0 if no substitution were done, -1 if some processing failed
* or the number of substitutions done.
*/
int
xmlXIncludeProcess(xmlDocPtr doc) {
return(xmlXIncludeProcessFlags(doc, 0));
}
/**
* xmlXIncludeProcessTreeFlags:
* @tree: a node in an XML document
* @flags: a set of xmlParserOption used for parsing XML includes
*
* Implement the XInclude substitution for the given subtree
*
* Returns 0 if no substitution were done, -1 if some processing failed
* or the number of substitutions done.
*/
int
xmlXIncludeProcessTreeFlags(xmlNodePtr tree, int flags) {
xmlXIncludeCtxtPtr ctxt;
int ret = 0;
if ((tree == NULL) || (tree->type == XML_NAMESPACE_DECL) ||
(tree->doc == NULL))
return(-1);
ctxt = xmlXIncludeNewContext(tree->doc);
if (ctxt == NULL)
return(-1);
xmlXIncludeSetFlags(ctxt, flags);
ret = xmlXIncludeDoProcessRoot(ctxt, tree);
if ((ret >= 0) && (ctxt->nbErrors > 0))
ret = -1;
xmlXIncludeFreeContext(ctxt);
return(ret);
}
/**
* xmlXIncludeProcessTree:
* @tree: a node in an XML document
*
* Implement the XInclude substitution for the given subtree
*
* Returns 0 if no substitution were done, -1 if some processing failed
* or the number of substitutions done.
*/
int
xmlXIncludeProcessTree(xmlNodePtr tree) {
return(xmlXIncludeProcessTreeFlags(tree, 0));
}
/**
* xmlXIncludeProcessNode:
* @ctxt: an existing XInclude context
* @node: a node in an XML document
*
* Implement the XInclude substitution for the given subtree reusing
* the information and data coming from the given context.
*
* Returns 0 if no substitution were done, -1 if some processing failed
* or the number of substitutions done.
*/
int
xmlXIncludeProcessNode(xmlXIncludeCtxtPtr ctxt, xmlNodePtr node) {
int ret = 0;
if ((node == NULL) || (node->type == XML_NAMESPACE_DECL) ||
(node->doc == NULL) || (ctxt == NULL))
return(-1);
ret = xmlXIncludeDoProcessRoot(ctxt, node);
if ((ret >= 0) && (ctxt->nbErrors > 0))
ret = -1;
return(ret);
}
#else /* !LIBXML_XINCLUDE_ENABLED */
#endif
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