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4467b89143
libxml2/c14n.c
Nick Wellnhofer 0bef170486 c14n: Fix memory leak after malloc failure
2024-05-07 17:11:18 +02:00

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/*
* "Canonical XML" implementation
* http://www.w3.org/TR/xml-c14n
*
* "Exclusive XML Canonicalization" implementation
* http://www.w3.org/TR/xml-exc-c14n
*
* See Copyright for the status of this software.
*
* Author: Aleksey Sanin <aleksey@aleksey.com>
*/
#define IN_LIBXML
#include "libxml.h"
#ifdef LIBXML_C14N_ENABLED
#include <stdlib.h>
#include <string.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/uri.h>
#include <libxml/xmlerror.h>
#include <libxml/xpathInternals.h>
#include <libxml/c14n.h>
#include "private/error.h"
#include "private/io.h"
/************************************************************************
* *
* Some declaration better left private ATM *
* *
************************************************************************/
typedef enum {
XMLC14N_BEFORE_DOCUMENT_ELEMENT = 0,
XMLC14N_INSIDE_DOCUMENT_ELEMENT = 1,
XMLC14N_AFTER_DOCUMENT_ELEMENT = 2
} xmlC14NPosition;
typedef struct _xmlC14NVisibleNsStack {
int nsCurEnd; /* number of nodes in the set */
int nsPrevStart; /* the beginning of the stack for previous visible node */
int nsPrevEnd; /* the end of the stack for previous visible node */
int nsMax; /* size of the array as allocated */
xmlNsPtr *nsTab; /* array of ns in no particular order */
xmlNodePtr *nodeTab; /* array of nodes in no particular order */
} xmlC14NVisibleNsStack, *xmlC14NVisibleNsStackPtr;
typedef struct _xmlC14NCtx {
/* input parameters */
xmlDocPtr doc;
xmlC14NIsVisibleCallback is_visible_callback;
void* user_data;
int with_comments;
xmlOutputBufferPtr buf;
/* position in the XML document */
xmlC14NPosition pos;
int parent_is_doc;
xmlC14NVisibleNsStackPtr ns_rendered;
/* C14N mode */
xmlC14NMode mode;
/* exclusive canonicalization */
xmlChar **inclusive_ns_prefixes;
/* error number */
int error;
} xmlC14NCtx, *xmlC14NCtxPtr;
static xmlC14NVisibleNsStackPtr xmlC14NVisibleNsStackCreate (void);
static void xmlC14NVisibleNsStackDestroy (xmlC14NVisibleNsStackPtr cur);
static int xmlC14NVisibleNsStackAdd (xmlC14NVisibleNsStackPtr cur,
xmlNsPtr ns,
xmlNodePtr node);
static void xmlC14NVisibleNsStackSave (xmlC14NVisibleNsStackPtr cur,
xmlC14NVisibleNsStackPtr state);
static void xmlC14NVisibleNsStackRestore (xmlC14NVisibleNsStackPtr cur,
xmlC14NVisibleNsStackPtr state);
static void xmlC14NVisibleNsStackShift (xmlC14NVisibleNsStackPtr cur);
static int xmlC14NVisibleNsStackFind (xmlC14NVisibleNsStackPtr cur,
xmlNsPtr ns);
static int xmlExcC14NVisibleNsStackFind (xmlC14NVisibleNsStackPtr cur,
xmlNsPtr ns,
xmlC14NCtxPtr ctx);
static int xmlC14NIsNodeInNodeset (void *user_data,
xmlNodePtr node,
xmlNodePtr parent);
static int xmlC14NProcessNode(xmlC14NCtxPtr ctx, xmlNodePtr cur);
static int xmlC14NProcessNodeList(xmlC14NCtxPtr ctx, xmlNodePtr cur);
typedef enum {
XMLC14N_NORMALIZE_ATTR = 0,
XMLC14N_NORMALIZE_COMMENT = 1,
XMLC14N_NORMALIZE_PI = 2,
XMLC14N_NORMALIZE_TEXT = 3
} xmlC14NNormalizationMode;
static xmlChar *xmlC11NNormalizeString(const xmlChar * input,
xmlC14NNormalizationMode mode);
#define xmlC11NNormalizeAttr( a ) \
xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_ATTR)
#define xmlC11NNormalizeComment( a ) \
xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_COMMENT)
#define xmlC11NNormalizePI( a ) \
xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_PI)
#define xmlC11NNormalizeText( a ) \
xmlC11NNormalizeString((a), XMLC14N_NORMALIZE_TEXT)
#define xmlC14NIsVisible( ctx, node, parent ) \
(((ctx)->is_visible_callback != NULL) ? \
(ctx)->is_visible_callback((ctx)->user_data, \
(xmlNodePtr)(node), (xmlNodePtr)(parent)) : 1)
#define xmlC14NIsExclusive( ctx ) \
( (ctx)->mode == XML_C14N_EXCLUSIVE_1_0 )
/************************************************************************
* *
* Some factorized error routines *
* *
************************************************************************/
/**
* xmlC14NErrMemory:
* @extra: extra information
*
* Handle a redefinition of memory error
*/
static void
xmlC14NErrMemory(xmlC14NCtxPtr ctxt)
{
if (ctxt != NULL)
ctxt->error = XML_ERR_NO_MEMORY;
xmlRaiseMemoryError(NULL, NULL, NULL, XML_FROM_C14N, NULL);
}
static void
xmlC14NErrFull(xmlC14NCtxPtr ctxt, xmlNodePtr node, int code, const char *str1,
const char *msg, ...)
{
va_list ap;
int res;
if (ctxt != NULL)
ctxt->error = code;
va_start(ap, msg);
res = xmlVRaiseError(NULL, NULL, NULL, ctxt, node,
XML_FROM_C14N, code, XML_ERR_ERROR, NULL, 0,
str1, NULL, NULL, 0, 0,
msg, ap);
va_end(ap);
if (res < 0)
xmlC14NErrMemory(ctxt);
}
/**
* xmlC14NErrParam:
* @extra: extra information
*
* Handle a param error
*/
static void
xmlC14NErrParam(xmlC14NCtxPtr ctxt)
{
xmlC14NErrFull(ctxt, NULL, XML_ERR_ARGUMENT, NULL,
"Invalid argument\n", NULL);
}
/**
* xmlC14NErrInvalidNode:
* @extra: extra information
*
* Handle an invalid node error
*/
static void
xmlC14NErrInvalidNode(xmlC14NCtxPtr ctxt, const char *node_type,
const char *extra)
{
xmlC14NErrFull(ctxt, NULL, XML_C14N_INVALID_NODE, extra,
"Node %s is invalid here : %s\n", node_type, extra);
}
/**
* xmlC14NErrUnknownNode:
* @extra: extra information
*
* Handle an unknown node error
*/
static void
xmlC14NErrUnknownNode(xmlC14NCtxPtr ctxt, int node_type, const char *extra)
{
xmlC14NErrFull(ctxt, NULL, XML_C14N_UNKNOW_NODE, extra,
"Unknown node type %d found : %s\n", node_type, extra);
}
/**
* xmlC14NErrRelativeNamespace:
* @extra: extra information
*
* Handle a relative namespace error
*/
static void
xmlC14NErrRelativeNamespace(xmlC14NCtxPtr ctxt, const char *ns_uri)
{
xmlC14NErrFull(ctxt, NULL, XML_C14N_RELATIVE_NAMESPACE, ns_uri,
"Relative namespace UR is invalid here : %s\n", ns_uri);
}
/**
* xmlC14NErr:
* @ctxt: a C14N evaluation context
* @node: the context node
* @error: the error code
* @msg: the message
* @extra: extra information
*
* Handle an error
*/
static void
xmlC14NErr(xmlC14NCtxPtr ctxt, xmlNodePtr node, int error,
const char * msg)
{
xmlC14NErrFull(ctxt, node, error, NULL, "%s", msg);
}
/************************************************************************
* *
* The implementation internals *
* *
************************************************************************/
#define XML_NAMESPACES_DEFAULT 16
static int
xmlC14NIsNodeInNodeset(void *user_data, xmlNodePtr node, xmlNodePtr parent) {
xmlNodeSetPtr nodes = (xmlNodeSetPtr) user_data;
if((nodes != NULL) && (node != NULL)) {
if(node->type != XML_NAMESPACE_DECL) {
return(xmlXPathNodeSetContains(nodes, node));
} else {
xmlNs ns;
memcpy(&ns, node, sizeof(ns));
/* this is a libxml hack! check xpath.c for details */
if((parent != NULL) && (parent->type == XML_ATTRIBUTE_NODE)) {
ns.next = (xmlNsPtr)parent->parent;
} else {
ns.next = (xmlNsPtr)parent;
}
/*
* If the input is an XPath node-set, then the node-set must explicitly
* contain every node to be rendered to the canonical form.
*/
return(xmlXPathNodeSetContains(nodes, (xmlNodePtr)&ns));
}
}
return(1);
}
static xmlC14NVisibleNsStackPtr
xmlC14NVisibleNsStackCreate(void) {
xmlC14NVisibleNsStackPtr ret;
ret = (xmlC14NVisibleNsStackPtr) xmlMalloc(sizeof(xmlC14NVisibleNsStack));
if (ret == NULL)
return(NULL);
memset(ret, 0, sizeof(xmlC14NVisibleNsStack));
return(ret);
}
static void
xmlC14NVisibleNsStackDestroy(xmlC14NVisibleNsStackPtr cur) {
if(cur == NULL) {
xmlC14NErrParam(NULL);
return;
}
if(cur->nsTab != NULL) {
memset(cur->nsTab, 0, cur->nsMax * sizeof(xmlNsPtr));
xmlFree(cur->nsTab);
}
if(cur->nodeTab != NULL) {
memset(cur->nodeTab, 0, cur->nsMax * sizeof(xmlNodePtr));
xmlFree(cur->nodeTab);
}
memset(cur, 0, sizeof(xmlC14NVisibleNsStack));
xmlFree(cur);
}
static int
xmlC14NVisibleNsStackAdd(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns, xmlNodePtr node) {
if((cur == NULL) ||
((cur->nsTab == NULL) && (cur->nodeTab != NULL)) ||
((cur->nsTab != NULL) && (cur->nodeTab == NULL)))
return (1);
if ((cur->nsTab == NULL) && (cur->nodeTab == NULL)) {
cur->nsTab = (xmlNsPtr*) xmlMalloc(XML_NAMESPACES_DEFAULT * sizeof(xmlNsPtr));
cur->nodeTab = (xmlNodePtr*) xmlMalloc(XML_NAMESPACES_DEFAULT * sizeof(xmlNodePtr));
if ((cur->nsTab == NULL) || (cur->nodeTab == NULL))
return (-1);
memset(cur->nsTab, 0 , XML_NAMESPACES_DEFAULT * sizeof(xmlNsPtr));
memset(cur->nodeTab, 0 , XML_NAMESPACES_DEFAULT * sizeof(xmlNodePtr));
cur->nsMax = XML_NAMESPACES_DEFAULT;
} else if(cur->nsMax == cur->nsCurEnd) {
void *tmp;
int tmpSize;
tmpSize = 2 * cur->nsMax;
tmp = xmlRealloc(cur->nsTab, tmpSize * sizeof(xmlNsPtr));
if (tmp == NULL)
return (-1);
cur->nsTab = (xmlNsPtr*)tmp;
tmp = xmlRealloc(cur->nodeTab, tmpSize * sizeof(xmlNodePtr));
if (tmp == NULL)
return (-1);
cur->nodeTab = (xmlNodePtr*)tmp;
cur->nsMax = tmpSize;
}
cur->nsTab[cur->nsCurEnd] = ns;
cur->nodeTab[cur->nsCurEnd] = node;
++cur->nsCurEnd;
return (0);
}
static void
xmlC14NVisibleNsStackSave(xmlC14NVisibleNsStackPtr cur, xmlC14NVisibleNsStackPtr state) {
if((cur == NULL) || (state == NULL)) {
xmlC14NErrParam(NULL);
return;
}
state->nsCurEnd = cur->nsCurEnd;
state->nsPrevStart = cur->nsPrevStart;
state->nsPrevEnd = cur->nsPrevEnd;
}
static void
xmlC14NVisibleNsStackRestore(xmlC14NVisibleNsStackPtr cur, xmlC14NVisibleNsStackPtr state) {
if((cur == NULL) || (state == NULL)) {
xmlC14NErrParam(NULL);
return;
}
cur->nsCurEnd = state->nsCurEnd;
cur->nsPrevStart = state->nsPrevStart;
cur->nsPrevEnd = state->nsPrevEnd;
}
static void
xmlC14NVisibleNsStackShift(xmlC14NVisibleNsStackPtr cur) {
if(cur == NULL) {
xmlC14NErrParam(NULL);
return;
}
cur->nsPrevStart = cur->nsPrevEnd;
cur->nsPrevEnd = cur->nsCurEnd;
}
static int
xmlC14NStrEqual(const xmlChar *str1, const xmlChar *str2) {
if (str1 == str2) return(1);
if (str1 == NULL) return((*str2) == '\0');
if (str2 == NULL) return((*str1) == '\0');
do {
if (*str1++ != *str2) return(0);
} while (*str2++);
return(1);
}
/**
* xmlC14NVisibleNsStackFind:
* @ctx: the C14N context
* @ns: the namespace to check
*
* Checks whether the given namespace was already rendered or not
*
* Returns 1 if we already wrote this namespace or 0 otherwise
*/
static int
xmlC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns)
{
int i;
const xmlChar *prefix;
const xmlChar *href;
int has_empty_ns;
if(cur == NULL) {
xmlC14NErrParam(NULL);
return (0);
}
/*
* if the default namespace xmlns="" is not defined yet then
* we do not want to print it out
*/
prefix = ((ns == NULL) || (ns->prefix == NULL)) ? BAD_CAST "" : ns->prefix;
href = ((ns == NULL) || (ns->href == NULL)) ? BAD_CAST "" : ns->href;
has_empty_ns = (xmlC14NStrEqual(prefix, NULL) && xmlC14NStrEqual(href, NULL));
if (cur->nsTab != NULL) {
int start = (has_empty_ns) ? 0 : cur->nsPrevStart;
for (i = cur->nsCurEnd - 1; i >= start; --i) {
xmlNsPtr ns1 = cur->nsTab[i];
if(xmlC14NStrEqual(prefix, (ns1 != NULL) ? ns1->prefix : NULL)) {
return(xmlC14NStrEqual(href, (ns1 != NULL) ? ns1->href : NULL));
}
}
}
return(has_empty_ns);
}
static int
xmlExcC14NVisibleNsStackFind(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns, xmlC14NCtxPtr ctx) {
int i;
const xmlChar *prefix;
const xmlChar *href;
int has_empty_ns;
if(cur == NULL) {
xmlC14NErrParam(ctx);
return (0);
}
/*
* if the default namespace xmlns="" is not defined yet then
* we do not want to print it out
*/
prefix = ((ns == NULL) || (ns->prefix == NULL)) ? BAD_CAST "" : ns->prefix;
href = ((ns == NULL) || (ns->href == NULL)) ? BAD_CAST "" : ns->href;
has_empty_ns = (xmlC14NStrEqual(prefix, NULL) && xmlC14NStrEqual(href, NULL));
if (cur->nsTab != NULL) {
int start = 0;
for (i = cur->nsCurEnd - 1; i >= start; --i) {
xmlNsPtr ns1 = cur->nsTab[i];
if(xmlC14NStrEqual(prefix, (ns1 != NULL) ? ns1->prefix : NULL)) {
if(xmlC14NStrEqual(href, (ns1 != NULL) ? ns1->href : NULL)) {
return(xmlC14NIsVisible(ctx, ns1, cur->nodeTab[i]));
} else {
return(0);
}
}
}
}
return(has_empty_ns);
}
/**
* xmlC14NIsXmlNs:
* @ns: the namespace to check
*
* Checks whether the given namespace is a default "xml:" namespace
* with href="http://www.w3.org/XML/1998/namespace"
*
* Returns 1 if the node is default or 0 otherwise
*/
/* todo: make it a define? */
static int
xmlC14NIsXmlNs(xmlNsPtr ns)
{
return ((ns != NULL) &&
(xmlStrEqual(ns->prefix, BAD_CAST "xml")) &&
(xmlStrEqual(ns->href, XML_XML_NAMESPACE)));
}
/**
* xmlC14NNsCompare:
* @ns1: the pointer to first namespace
* @ns2: the pointer to second namespace
*
* Compares the namespaces by names (prefixes).
*
* Returns -1 if ns1 < ns2, 0 if ns1 == ns2 or 1 if ns1 > ns2.
*/
static int
xmlC14NNsCompare(const void *data1, const void *data2)
{
const xmlNs *ns1 = data1;
const xmlNs *ns2 = data2;
if (ns1 == ns2)
return (0);
if (ns1 == NULL)
return (-1);
if (ns2 == NULL)
return (1);
return (xmlStrcmp(ns1->prefix, ns2->prefix));
}
/**
* xmlC14NPrintNamespaces:
* @ns: the pointer to namespace
* @ctx: the C14N context
*
* Prints the given namespace to the output buffer from C14N context.
*
* Returns 1 on success or 0 on fail.
*/
static int
xmlC14NPrintNamespaces(const xmlNs *ns, xmlC14NCtxPtr ctx)
{
if ((ns == NULL) || (ctx == NULL)) {
xmlC14NErrParam(ctx);
return 0;
}
if (ns->prefix != NULL) {
xmlOutputBufferWriteString(ctx->buf, " xmlns:");
xmlOutputBufferWriteString(ctx->buf, (const char *) ns->prefix);
xmlOutputBufferWriteString(ctx->buf, "=");
} else {
xmlOutputBufferWriteString(ctx->buf, " xmlns=");
}
if(ns->href != NULL) {
xmlOutputBufferWriteQuotedString(ctx->buf, ns->href);
} else {
xmlOutputBufferWriteString(ctx->buf, "\"\"");
}
return (1);
}
static int
xmlC14NPrintNamespacesWalker(const void *ns, void *ctx) {
return xmlC14NPrintNamespaces(ns, ctx);
}
/**
* xmlC14NProcessNamespacesAxis:
* @ctx: the C14N context
* @node: the current node
*
* Prints out canonical namespace axis of the current node to the
* buffer from C14N context as follows
*
* Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
*
* Namespace Axis
* Consider a list L containing only namespace nodes in the
* axis and in the node-set in lexicographic order (ascending). To begin
* processing L, if the first node is not the default namespace node (a node
* with no namespace URI and no local name), then generate a space followed
* by xmlns="" if and only if the following conditions are met:
* - the element E that owns the axis is in the node-set
* - The nearest ancestor element of E in the node-set has a default
* namespace node in the node-set (default namespace nodes always
* have non-empty values in XPath)
* The latter condition eliminates unnecessary occurrences of xmlns="" in
* the canonical form since an element only receives an xmlns="" if its
* default namespace is empty and if it has an immediate parent in the
* canonical form that has a non-empty default namespace. To finish
* processing L, simply process every namespace node in L, except omit
* namespace node with local name xml, which defines the xml prefix,
* if its string value is http://www.w3.org/XML/1998/namespace.
*
* Exclusive XML Canonicalization v 1.0 (http://www.w3.org/TR/xml-exc-c14n)
* Canonical XML applied to a document subset requires the search of the
* ancestor nodes of each orphan element node for attributes in the xml
* namespace, such as xml:lang and xml:space. These are copied into the
* element node except if a declaration of the same attribute is already
* in the attribute axis of the element (whether or not it is included in
* the document subset). This search and copying are omitted from the
* Exclusive XML Canonicalization method.
*
* Returns 0 on success or -1 on fail.
*/
static int
xmlC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
{
xmlNodePtr n;
xmlNsPtr ns, tmp;
xmlListPtr list;
int already_rendered;
int has_empty_ns = 0;
if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
xmlC14NErrParam(ctx);
return (-1);
}
/*
* Create a sorted list to store element namespaces
*/
list = xmlListCreate(NULL, xmlC14NNsCompare);
if (list == NULL) {
xmlC14NErrMemory(ctx);
return (-1);
}
/* check all namespaces */
for(n = cur; n != NULL; n = n->parent) {
for(ns = n->nsDef; ns != NULL; ns = ns->next) {
tmp = xmlSearchNs(cur->doc, cur, ns->prefix);
if((tmp == ns) && !xmlC14NIsXmlNs(ns) && xmlC14NIsVisible(ctx, ns, cur)) {
already_rendered = xmlC14NVisibleNsStackFind(ctx->ns_rendered, ns);
if(visible) {
if (xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur) < 0) {
xmlC14NErrMemory(ctx);
goto error;
}
}
if(!already_rendered) {
xmlListInsert(list, ns);
}
if(xmlStrlen(ns->prefix) == 0) {
has_empty_ns = 1;
}
}
}
}
/**
* if the first node is not the default namespace node (a node with no
* namespace URI and no local name), then generate a space followed by
* xmlns="" if and only if the following conditions are met:
* - the element E that owns the axis is in the node-set
* - the nearest ancestor element of E in the node-set has a default
* namespace node in the node-set (default namespace nodes always
* have non-empty values in XPath)
*/
if(visible && !has_empty_ns) {
static xmlNs ns_default;
memset(&ns_default, 0, sizeof(ns_default));
if(!xmlC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default)) {
xmlC14NPrintNamespaces(&ns_default, ctx);
}
}
/*
* print out all elements from list
*/
xmlListWalk(list, xmlC14NPrintNamespacesWalker, (void *) ctx);
/*
* Cleanup
*/
error:
xmlListDelete(list);
return (0);
}
/**
* xmlExcC14NProcessNamespacesAxis:
* @ctx: the C14N context
* @node: the current node
*
* Prints out exclusive canonical namespace axis of the current node to the
* buffer from C14N context as follows
*
* Exclusive XML Canonicalization
* http://www.w3.org/TR/xml-exc-c14n
*
* If the element node is in the XPath subset then output the node in
* accordance with Canonical XML except for namespace nodes which are
* rendered as follows:
*
* 1. Render each namespace node iff:
* * it is visibly utilized by the immediate parent element or one of
* its attributes, or is present in InclusiveNamespaces PrefixList, and
* * its prefix and value do not appear in ns_rendered. ns_rendered is
* obtained by popping the state stack in order to obtain a list of
* prefixes and their values which have already been rendered by
* an output ancestor of the namespace node's parent element.
* 2. Append the rendered namespace node to the list ns_rendered of namespace
* nodes rendered by output ancestors. Push ns_rendered on state stack and
* recurse.
* 3. After the recursion returns, pop thestate stack.
*
*
* Returns 0 on success or -1 on fail.
*/
static int
xmlExcC14NProcessNamespacesAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
{
xmlNsPtr ns;
xmlListPtr list;
xmlAttrPtr attr;
int already_rendered;
int has_empty_ns = 0;
int has_visibly_utilized_empty_ns = 0;
int has_empty_ns_in_inclusive_list = 0;
if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
xmlC14NErrParam(ctx);
return (-1);
}
if(!xmlC14NIsExclusive(ctx)) {
xmlC14NErrParam(ctx);
return (-1);
}
/*
* Create a sorted list to store element namespaces
*/
list = xmlListCreate(NULL, xmlC14NNsCompare);
if (list == NULL) {
xmlC14NErrMemory(ctx);
return (-1);
}
/*
* process inclusive namespaces:
* All namespace nodes appearing on inclusive ns list are
* handled as provided in Canonical XML
*/
if(ctx->inclusive_ns_prefixes != NULL) {
xmlChar *prefix;
int i;
for (i = 0; ctx->inclusive_ns_prefixes[i] != NULL; ++i) {
prefix = ctx->inclusive_ns_prefixes[i];
/*
* Special values for namespace with empty prefix
*/
if (xmlStrEqual(prefix, BAD_CAST "#default")
|| xmlStrEqual(prefix, BAD_CAST "")) {
prefix = NULL;
has_empty_ns_in_inclusive_list = 1;
}
ns = xmlSearchNs(cur->doc, cur, prefix);
if((ns != NULL) && !xmlC14NIsXmlNs(ns) && xmlC14NIsVisible(ctx, ns, cur)) {
already_rendered = xmlC14NVisibleNsStackFind(ctx->ns_rendered, ns);
if(visible) {
if (xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur) < 0) {
xmlC14NErrMemory(ctx);
goto error;
}
}
if(!already_rendered) {
xmlListInsert(list, ns);
}
if(xmlStrlen(ns->prefix) == 0) {
has_empty_ns = 1;
}
}
}
}
/* add node namespace */
if(cur->ns != NULL) {
ns = cur->ns;
} else {
ns = xmlSearchNs(cur->doc, cur, NULL);
has_visibly_utilized_empty_ns = 1;
}
if((ns != NULL) && !xmlC14NIsXmlNs(ns)) {
if(visible && xmlC14NIsVisible(ctx, ns, cur)) {
if(!xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, ns, ctx)) {
xmlListInsert(list, ns);
}
}
if(visible) {
if (xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur) < 0) {
xmlC14NErrMemory(ctx);
goto error;
}
}
if(xmlStrlen(ns->prefix) == 0) {
has_empty_ns = 1;
}
}
/* add attributes */
for(attr = cur->properties; attr != NULL; attr = attr->next) {
/*
* we need to check that attribute is visible and has non
* default namespace (XML Namespaces: "default namespaces
* do not apply directly to attributes")
*/
if((attr->ns != NULL) && !xmlC14NIsXmlNs(attr->ns) && xmlC14NIsVisible(ctx, attr, cur)) {
already_rendered = xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, attr->ns, ctx);
if (xmlC14NVisibleNsStackAdd(ctx->ns_rendered, attr->ns, cur) < 0) {
xmlC14NErrMemory(ctx);
goto error;
}
if(!already_rendered && visible) {
xmlListInsert(list, attr->ns);
}
if(xmlStrlen(attr->ns->prefix) == 0) {
has_empty_ns = 1;
}
} else if((attr->ns != NULL) && (xmlStrlen(attr->ns->prefix) == 0) && (xmlStrlen(attr->ns->href) == 0)) {
has_visibly_utilized_empty_ns = 1;
}
}
/*
* Process xmlns=""
*/
if(visible && has_visibly_utilized_empty_ns &&
!has_empty_ns && !has_empty_ns_in_inclusive_list) {
static xmlNs ns_default;
memset(&ns_default, 0, sizeof(ns_default));
already_rendered = xmlExcC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default, ctx);
if(!already_rendered) {
xmlC14NPrintNamespaces(&ns_default, ctx);
}
} else if(visible && !has_empty_ns && has_empty_ns_in_inclusive_list) {
static xmlNs ns_default;
memset(&ns_default, 0, sizeof(ns_default));
if(!xmlC14NVisibleNsStackFind(ctx->ns_rendered, &ns_default)) {
xmlC14NPrintNamespaces(&ns_default, ctx);
}
}
/*
* print out all elements from list
*/
xmlListWalk(list, xmlC14NPrintNamespacesWalker, (void *) ctx);
/*
* Cleanup
*/
error:
xmlListDelete(list);
return (0);
}
/**
* xmlC14NIsXmlAttr:
* @attr: the attr to check
*
* Checks whether the given attribute is a default "xml:" namespace
* with href="http://www.w3.org/XML/1998/namespace"
*
* Returns 1 if the node is default or 0 otherwise
*/
/* todo: make it a define? */
static int
xmlC14NIsXmlAttr(xmlAttrPtr attr)
{
return ((attr->ns != NULL) &&
(xmlC14NIsXmlNs(attr->ns) != 0));
}
/**
* xmlC14NAttrsCompare:
* @attr1: the pointer tls o first attr
* @attr2: the pointer to second attr
*
* Prints the given attribute to the output buffer from C14N context.
*
* Returns -1 if attr1 < attr2, 0 if attr1 == attr2 or 1 if attr1 > attr2.
*/
static int
xmlC14NAttrsCompare(const void *data1, const void *data2)
{
const xmlAttr *attr1 = data1;
const xmlAttr *attr2 = data2;
int ret = 0;
/*
* Simple cases
*/
if (attr1 == attr2)
return (0);
if (attr1 == NULL)
return (-1);
if (attr2 == NULL)
return (1);
if (attr1->ns == attr2->ns) {
return (xmlStrcmp(attr1->name, attr2->name));
}
/*
* Attributes in the default namespace are first
* because the default namespace is not applied to
* unqualified attributes
*/
if (attr1->ns == NULL)
return (-1);
if (attr2->ns == NULL)
return (1);
if (attr1->ns->prefix == NULL)
return (-1);
if (attr2->ns->prefix == NULL)
return (1);
ret = xmlStrcmp(attr1->ns->href, attr2->ns->href);
if (ret == 0) {
ret = xmlStrcmp(attr1->name, attr2->name);
}
return (ret);
}
/**
* xmlC14NPrintAttrs:
* @attr: the pointer to attr
* @ctx: the C14N context
*
* Prints out canonical attribute urrent node to the
* buffer from C14N context as follows
*
* Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
*
* Returns 1 on success or 0 on fail.
*/
static int
xmlC14NPrintAttrs(const void *data, void *user)
{
const xmlAttr *attr = data;
xmlC14NCtxPtr ctx = (xmlC14NCtxPtr) user;
xmlChar *value;
xmlChar *buffer;
if ((attr == NULL) || (ctx == NULL)) {
xmlC14NErrParam(ctx);
return (0);
}
xmlOutputBufferWriteString(ctx->buf, " ");
if (attr->ns != NULL && xmlStrlen(attr->ns->prefix) > 0) {
xmlOutputBufferWriteString(ctx->buf,
(const char *) attr->ns->prefix);
xmlOutputBufferWriteString(ctx->buf, ":");
}
xmlOutputBufferWriteString(ctx->buf, (const char *) attr->name);
xmlOutputBufferWriteString(ctx->buf, "=\"");
value = xmlNodeListGetString(ctx->doc, attr->children, 1);
/* todo: should we log an error if value==NULL ? */
if (value != NULL) {
buffer = xmlC11NNormalizeAttr(value);
xmlFree(value);
if (buffer != NULL) {
xmlOutputBufferWriteString(ctx->buf, (const char *) buffer);
xmlFree(buffer);
} else {
xmlC14NErrMemory(ctx);
return (0);
}
}
xmlOutputBufferWriteString(ctx->buf, "\"");
return (1);
}
/**
* xmlC14NFindHiddenParentAttr:
*
* Finds an attribute in a hidden parent node.
*
* Returns a pointer to the attribute node (if found) or NULL otherwise.
*/
static xmlAttrPtr
xmlC14NFindHiddenParentAttr(xmlC14NCtxPtr ctx, xmlNodePtr cur, const xmlChar * name, const xmlChar * ns)
{
xmlAttrPtr res;
while((cur != NULL) && (!xmlC14NIsVisible(ctx, cur, cur->parent))) {
res = xmlHasNsProp(cur, name, ns);
if(res != NULL) {
return res;
}
cur = cur->parent;
}
return NULL;
}
/**
* xmlC14NFixupBaseAttr:
*
* Fixes up the xml:base attribute
*
* Returns the newly created attribute or NULL
*/
static xmlAttrPtr
xmlC14NFixupBaseAttr(xmlC14NCtxPtr ctx, xmlAttrPtr xml_base_attr)
{
xmlChar * res = NULL;
xmlNodePtr cur;
xmlAttrPtr attr;
xmlChar * tmp_str;
xmlChar * tmp_str2;
int tmp_str_len;
if ((ctx == NULL) || (xml_base_attr == NULL) || (xml_base_attr->parent == NULL)) {
xmlC14NErrParam(ctx);
return (NULL);
}
/* start from current value */
res = xmlNodeListGetString(ctx->doc, xml_base_attr->children, 1);
if(res == NULL) {
xmlC14NErrMemory(ctx);
return (NULL);
}
/* go up the stack until we find a node that we rendered already */
cur = xml_base_attr->parent->parent;
while((cur != NULL) && (!xmlC14NIsVisible(ctx, cur, cur->parent))) {
int code;
attr = xmlHasNsProp(cur, BAD_CAST "base", XML_XML_NAMESPACE);
if(attr != NULL) {
/* get attr value */
tmp_str = xmlNodeListGetString(ctx->doc, attr->children, 1);
if(tmp_str == NULL) {
xmlFree(res);
xmlC14NErrMemory(ctx);
return (NULL);
}
/* we need to add '/' if our current base uri ends with '..' or '.'
to ensure that we are forced to go "up" all the time */
tmp_str_len = xmlStrlen(tmp_str);
if(tmp_str_len > 1 && tmp_str[tmp_str_len - 2] == '.') {
tmp_str2 = xmlStrcat(tmp_str, BAD_CAST "/");
if(tmp_str2 == NULL) {
xmlFree(tmp_str);
xmlFree(res);
xmlC14NErrMemory(ctx);
return (NULL);
}
tmp_str = tmp_str2;
}
/* build uri */
code = xmlBuildURISafe(res, tmp_str, &tmp_str2);
if (code != 0) {
xmlFree(tmp_str);
xmlFree(res);
if (code < 0)
xmlC14NErrMemory(ctx);
else
xmlC14NErr(ctx, cur, XML_ERR_INVALID_URI,
"processing xml:base attribute - "
"can't construct uri");
return (NULL);
}
/* cleanup and set the new res */
xmlFree(tmp_str);
xmlFree(res);
res = tmp_str2;
}
/* next */
cur = cur->parent;
}
/* check if result uri is empty or not */
if((res == NULL) || xmlStrEqual(res, BAD_CAST "")) {
xmlFree(res);
return (NULL);
}
/* create and return the new attribute node */
attr = xmlNewNsProp(NULL, xml_base_attr->ns, BAD_CAST "base", res);
if(attr == NULL) {
xmlFree(res);
xmlC14NErrMemory(ctx);
return (NULL);
}
/* done */
xmlFree(res);
return (attr);
}
/**
* xmlC14NProcessAttrsAxis:
* @ctx: the C14N context
* @cur: the current node
* @parent_visible: the visibility of parent node
* @all_parents_visible: the visibility of all parent nodes
*
* Prints out canonical attribute axis of the current node to the
* buffer from C14N context as follows
*
* Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
*
* Attribute Axis
* In lexicographic order (ascending), process each node that
* is in the element's attribute axis and in the node-set.
*
* The processing of an element node E MUST be modified slightly
* when an XPath node-set is given as input and the element's
* parent is omitted from the node-set.
*
*
* Exclusive XML Canonicalization v 1.0 (http://www.w3.org/TR/xml-exc-c14n)
*
* Canonical XML applied to a document subset requires the search of the
* ancestor nodes of each orphan element node for attributes in the xml
* namespace, such as xml:lang and xml:space. These are copied into the
* element node except if a declaration of the same attribute is already
* in the attribute axis of the element (whether or not it is included in
* the document subset). This search and copying are omitted from the
* Exclusive XML Canonicalization method.
*
* Returns 0 on success or -1 on fail.
*/
static int
xmlC14NProcessAttrsAxis(xmlC14NCtxPtr ctx, xmlNodePtr cur, int parent_visible)
{
xmlAttrPtr attr;
xmlListPtr list;
xmlAttrPtr attrs_to_delete = NULL;
/* special processing for 1.1 spec */
xmlAttrPtr xml_base_attr = NULL;
xmlAttrPtr xml_lang_attr = NULL;
xmlAttrPtr xml_space_attr = NULL;
if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
xmlC14NErrParam(ctx);
return (-1);
}
/*
* Create a sorted list to store element attributes
*/
list = xmlListCreate(NULL, xmlC14NAttrsCompare);
if (list == NULL) {
xmlC14NErrMemory(ctx);
return (-1);
}
switch(ctx->mode) {
case XML_C14N_1_0:
/* The processing of an element node E MUST be modified slightly when an XPath node-set is
* given as input and the element's parent is omitted from the node-set. The method for processing
* the attribute axis of an element E in the node-set is enhanced. All element nodes along E's
* ancestor axis are examined for nearest occurrences of attributes in the xml namespace, such
* as xml:lang and xml:space (whether or not they are in the node-set). From this list of attributes,
* remove any that are in E's attribute axis (whether or not they are in the node-set). Then,
* lexicographically merge this attribute list with the nodes of E's attribute axis that are in
* the node-set. The result of visiting the attribute axis is computed by processing the attribute
* nodes in this merged attribute list.
*/
/*
* Add all visible attributes from current node.
*/
attr = cur->properties;
while (attr != NULL) {
/* check that attribute is visible */
if (xmlC14NIsVisible(ctx, attr, cur)) {
xmlListInsert(list, attr);
}
attr = attr->next;
}
/*
* Handle xml attributes
*/
if (parent_visible && (cur->parent != NULL) &&
(!xmlC14NIsVisible(ctx, cur->parent, cur->parent->parent)))
{
xmlNodePtr tmp;
/*
* If XPath node-set is not specified then the parent is always
* visible!
*/
tmp = cur->parent;
while (tmp != NULL) {
attr = tmp->properties;
while (attr != NULL) {
if (xmlC14NIsXmlAttr(attr) != 0) {
if (xmlListSearch(list, attr) == NULL) {
xmlListInsert(list, attr);
}
}
attr = attr->next;
}
tmp = tmp->parent;
}
}
/* done */
break;
case XML_C14N_EXCLUSIVE_1_0:
/* attributes in the XML namespace, such as xml:lang and xml:space
* are not imported into orphan nodes of the document subset
*/
/*
* Add all visible attributes from current node.
*/
attr = cur->properties;
while (attr != NULL) {
/* check that attribute is visible */
if (xmlC14NIsVisible(ctx, attr, cur)) {
xmlListInsert(list, attr);
}
attr = attr->next;
}
/* do nothing special for xml attributes */
break;
case XML_C14N_1_1:
/* The processing of an element node E MUST be modified slightly when an XPath node-set is
* given as input and some of the element's ancestors are omitted from the node-set.
*
* Simple inheritable attributes are attributes that have a value that requires at most a simple
* redeclaration. This redeclaration is done by supplying a new value in the child axis. The
* redeclaration of a simple inheritable attribute A contained in one of E's ancestors is done
* by supplying a value to an attribute Ae inside E with the same name. Simple inheritable attributes
* are xml:lang and xml:space.
*
* The method for processing the attribute axis of an element E in the node-set is hence enhanced.
* All element nodes along E's ancestor axis are examined for the nearest occurrences of simple
* inheritable attributes in the xml namespace, such as xml:lang and xml:space (whether or not they
* are in the node-set). From this list of attributes, any simple inheritable attributes that are
* already in E's attribute axis (whether or not they are in the node-set) are removed. Then,
* lexicographically merge this attribute list with the nodes of E's attribute axis that are in
* the node-set. The result of visiting the attribute axis is computed by processing the attribute
* nodes in this merged attribute list.
*
* The xml:id attribute is not a simple inheritable attribute and no processing of these attributes is
* performed.
*
* The xml:base attribute is not a simple inheritable attribute and requires special processing beyond
* a simple redeclaration.
*
* Attributes in the XML namespace other than xml:base, xml:id, xml:lang, and xml:space MUST be processed
* as ordinary attributes.
*/
/*
* Add all visible attributes from current node.
*/
attr = cur->properties;
while (attr != NULL) {
/* special processing for XML attribute kiks in only when we have invisible parents */
if ((!parent_visible) || (xmlC14NIsXmlAttr(attr) == 0)) {
/* check that attribute is visible */
if (xmlC14NIsVisible(ctx, attr, cur)) {
xmlListInsert(list, attr);
}
} else {
int matched = 0;
/* check for simple inheritance attributes */
if((!matched) && (xml_lang_attr == NULL) && xmlStrEqual(attr->name, BAD_CAST "lang")) {
xml_lang_attr = attr;
matched = 1;
}
if((!matched) && (xml_space_attr == NULL) && xmlStrEqual(attr->name, BAD_CAST "space")) {
xml_space_attr = attr;
matched = 1;
}
/* check for base attr */
if((!matched) && (xml_base_attr == NULL) && xmlStrEqual(attr->name, BAD_CAST "base")) {
xml_base_attr = attr;
matched = 1;
}
/* otherwise, it is a normal attribute, so just check if it is visible */
if((!matched) && xmlC14NIsVisible(ctx, attr, cur)) {
xmlListInsert(list, attr);
}
}
/* move to the next one */
attr = attr->next;
}
/* special processing for XML attribute kiks in only when we have invisible parents */
if ((parent_visible)) {
/* simple inheritance attributes - copy */
if(xml_lang_attr == NULL) {
xml_lang_attr = xmlC14NFindHiddenParentAttr(ctx, cur->parent, BAD_CAST "lang", XML_XML_NAMESPACE);
}
if(xml_lang_attr != NULL) {
xmlListInsert(list, xml_lang_attr);
}
if(xml_space_attr == NULL) {
xml_space_attr = xmlC14NFindHiddenParentAttr(ctx, cur->parent, BAD_CAST "space", XML_XML_NAMESPACE);
}
if(xml_space_attr != NULL) {
xmlListInsert(list, xml_space_attr);
}
/* base uri attribute - fix up */
if(xml_base_attr == NULL) {
/* if we don't have base uri attribute, check if we have a "hidden" one above */
xml_base_attr = xmlC14NFindHiddenParentAttr(ctx, cur->parent, BAD_CAST "base", XML_XML_NAMESPACE);
}
if(xml_base_attr != NULL) {
xml_base_attr = xmlC14NFixupBaseAttr(ctx, xml_base_attr);
if(xml_base_attr != NULL) {
xmlListInsert(list, xml_base_attr);
/* note that we MUST delete returned attr node ourselves! */
xml_base_attr->next = attrs_to_delete;
attrs_to_delete = xml_base_attr;
}
}
}
/* done */
break;
}
/*
* print out all elements from list
*/
xmlListWalk(list, xmlC14NPrintAttrs, (void *) ctx);
/*
* Cleanup
*/
xmlFreePropList(attrs_to_delete);
xmlListDelete(list);
return (0);
}
/**
* xmlC14NCheckForRelativeNamespaces:
* @ctx: the C14N context
* @cur: the current element node
*
* Checks that current element node has no relative namespaces defined
*
* Returns 0 if the node has no relative namespaces or -1 otherwise.
*/
static int
xmlC14NCheckForRelativeNamespaces(xmlC14NCtxPtr ctx, xmlNodePtr cur)
{
xmlNsPtr ns;
if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
xmlC14NErrParam(ctx);
return (-1);
}
ns = cur->nsDef;
while (ns != NULL) {
if (xmlStrlen(ns->href) > 0) {
xmlURIPtr uri;
int code;
code = xmlParseURISafe((const char *) ns->href, &uri);
if (uri == NULL) {
if (code < 0)
xmlC14NErrMemory(ctx);
else
xmlC14NErr(ctx, cur, XML_ERR_INVALID_URI,
"parsing namespace uri");
return (-1);
}
if (xmlStrlen((const xmlChar *) uri->scheme) == 0) {
xmlC14NErrRelativeNamespace(ctx, uri->scheme);
xmlFreeURI(uri);
return (-1);
}
xmlFreeURI(uri);
}
ns = ns->next;
}
return (0);
}
/**
* xmlC14NProcessElementNode:
* @ctx: the pointer to C14N context object
* @cur: the node to process
* @visible: this node is visible
* @all_parents_visible: whether all the parents of this node are visible
*
* Canonical XML v 1.0 (http://www.w3.org/TR/xml-c14n)
*
* Element Nodes
* If the element is not in the node-set, then the result is obtained
* by processing the namespace axis, then the attribute axis, then
* processing the child nodes of the element that are in the node-set
* (in document order). If the element is in the node-set, then the result
* is an open angle bracket (<), the element QName, the result of
* processing the namespace axis, the result of processing the attribute
* axis, a close angle bracket (>), the result of processing the child
* nodes of the element that are in the node-set (in document order), an
* open angle bracket, a forward slash (/), the element QName, and a close
* angle bracket.
*
* Returns non-negative value on success or negative value on fail
*/
static int
xmlC14NProcessElementNode(xmlC14NCtxPtr ctx, xmlNodePtr cur, int visible)
{
int ret;
xmlC14NVisibleNsStack state;
int parent_is_doc = 0;
if ((ctx == NULL) || (cur == NULL) || (cur->type != XML_ELEMENT_NODE)) {
xmlC14NErrParam(ctx);
return (-1);
}
/*
* Check relative relative namespaces:
* implementations of XML canonicalization MUST report an operation
* failure on documents containing relative namespace URIs.
*/
if (xmlC14NCheckForRelativeNamespaces(ctx, cur) < 0)
return (-1);
/*
* Save ns_rendered stack position
*/
memset(&state, 0, sizeof(state));
xmlC14NVisibleNsStackSave(ctx->ns_rendered, &state);
if (visible) {
if (ctx->parent_is_doc) {
/* save this flag into the stack */
parent_is_doc = ctx->parent_is_doc;
ctx->parent_is_doc = 0;
ctx->pos = XMLC14N_INSIDE_DOCUMENT_ELEMENT;
}
xmlOutputBufferWriteString(ctx->buf, "<");
if ((cur->ns != NULL) && (xmlStrlen(cur->ns->prefix) > 0)) {
xmlOutputBufferWriteString(ctx->buf,
(const char *) cur->ns->prefix);
xmlOutputBufferWriteString(ctx->buf, ":");
}
xmlOutputBufferWriteString(ctx->buf, (const char *) cur->name);
}
if (!xmlC14NIsExclusive(ctx)) {
ret = xmlC14NProcessNamespacesAxis(ctx, cur, visible);
} else {
ret = xmlExcC14NProcessNamespacesAxis(ctx, cur, visible);
}
if (ret < 0)
return (-1);
/* todo: shouldn't this go to "visible only"? */
if(visible) {
xmlC14NVisibleNsStackShift(ctx->ns_rendered);
}
ret = xmlC14NProcessAttrsAxis(ctx, cur, visible);
if (ret < 0)
return (-1);
if (visible) {
xmlOutputBufferWriteString(ctx->buf, ">");
}
if (cur->children != NULL) {
ret = xmlC14NProcessNodeList(ctx, cur->children);
if (ret < 0)
return (-1);
}
if (visible) {
xmlOutputBufferWriteString(ctx->buf, "</");
if ((cur->ns != NULL) && (xmlStrlen(cur->ns->prefix) > 0)) {
xmlOutputBufferWriteString(ctx->buf,
(const char *) cur->ns->prefix);
xmlOutputBufferWriteString(ctx->buf, ":");
}
xmlOutputBufferWriteString(ctx->buf, (const char *) cur->name);
xmlOutputBufferWriteString(ctx->buf, ">");
if (parent_is_doc) {
/* restore this flag from the stack for next node */
ctx->parent_is_doc = parent_is_doc;
ctx->pos = XMLC14N_AFTER_DOCUMENT_ELEMENT;
}
}
/*
* Restore ns_rendered stack position
*/
xmlC14NVisibleNsStackRestore(ctx->ns_rendered, &state);
return (0);
}
/**
* xmlC14NProcessNode:
* @ctx: the pointer to C14N context object
* @cur: the node to process
*
* Processes the given node
*
* Returns non-negative value on success or negative value on fail
*/
static int
xmlC14NProcessNode(xmlC14NCtxPtr ctx, xmlNodePtr cur)
{
int ret = 0;
int visible;
if ((ctx == NULL) || (cur == NULL)) {
xmlC14NErrParam(ctx);
return (-1);
}
visible = xmlC14NIsVisible(ctx, cur, cur->parent);
switch (cur->type) {
case XML_ELEMENT_NODE:
ret = xmlC14NProcessElementNode(ctx, cur, visible);
break;
case XML_CDATA_SECTION_NODE:
case XML_TEXT_NODE:
/*
* Text Nodes
* the string value, except all ampersands are replaced
* by &amp;, all open angle brackets (<) are replaced by &lt;, all closing
* angle brackets (>) are replaced by &gt;, and all #xD characters are
* replaced by &#xD;.
*/
/* cdata sections are processed as text nodes */
/* todo: verify that cdata sections are included in XPath nodes set */
if ((visible) && (cur->content != NULL)) {
xmlChar *buffer;
buffer = xmlC11NNormalizeText(cur->content);
if (buffer != NULL) {
xmlOutputBufferWriteString(ctx->buf,
(const char *) buffer);
xmlFree(buffer);
} else {
xmlC14NErrMemory(ctx);
return (-1);
}
}
break;
case XML_PI_NODE:
/*
* Processing Instruction (PI) Nodes-
* The opening PI symbol (<?), the PI target name of the node,
* a leading space and the string value if it is not empty, and
* the closing PI symbol (?>). If the string value is empty,
* then the leading space is not added. Also, a trailing #xA is
* rendered after the closing PI symbol for PI children of the
* root node with a lesser document order than the document
* element, and a leading #xA is rendered before the opening PI
* symbol of PI children of the root node with a greater document
* order than the document element.
*/
if (visible) {
if (ctx->pos == XMLC14N_AFTER_DOCUMENT_ELEMENT) {
xmlOutputBufferWriteString(ctx->buf, "\x0A<?");
} else {
xmlOutputBufferWriteString(ctx->buf, "<?");
}
xmlOutputBufferWriteString(ctx->buf,
(const char *) cur->name);
if ((cur->content != NULL) && (*(cur->content) != '\0')) {
xmlChar *buffer;
xmlOutputBufferWriteString(ctx->buf, " ");
/* todo: do we need to normalize pi? */
buffer = xmlC11NNormalizePI(cur->content);
if (buffer != NULL) {
xmlOutputBufferWriteString(ctx->buf,
(const char *) buffer);
xmlFree(buffer);
} else {
xmlC14NErrMemory(ctx);
return (-1);
}
}
if (ctx->pos == XMLC14N_BEFORE_DOCUMENT_ELEMENT) {
xmlOutputBufferWriteString(ctx->buf, "?>\x0A");
} else {
xmlOutputBufferWriteString(ctx->buf, "?>");
}
}
break;
case XML_COMMENT_NODE:
/*
* Comment Nodes
* Nothing if generating canonical XML without comments. For
* canonical XML with comments, generate the opening comment
* symbol (<!--), the string value of the node, and the
* closing comment symbol (-->). Also, a trailing #xA is rendered
* after the closing comment symbol for comment children of the
* root node with a lesser document order than the document
* element, and a leading #xA is rendered before the opening
* comment symbol of comment children of the root node with a
* greater document order than the document element. (Comment
* children of the root node represent comments outside of the
* top-level document element and outside of the document type
* declaration).
*/
if (visible && ctx->with_comments) {
if (ctx->pos == XMLC14N_AFTER_DOCUMENT_ELEMENT) {
xmlOutputBufferWriteString(ctx->buf, "\x0A<!--");
} else {
xmlOutputBufferWriteString(ctx->buf, "<!--");
}
if (cur->content != NULL) {
xmlChar *buffer;
/* todo: do we need to normalize comment? */
buffer = xmlC11NNormalizeComment(cur->content);
if (buffer != NULL) {
xmlOutputBufferWriteString(ctx->buf,
(const char *) buffer);
xmlFree(buffer);
} else {
xmlC14NErrMemory(ctx);
return (-1);
}
}
if (ctx->pos == XMLC14N_BEFORE_DOCUMENT_ELEMENT) {
xmlOutputBufferWriteString(ctx->buf, "-->\x0A");
} else {
xmlOutputBufferWriteString(ctx->buf, "-->");
}
}
break;
case XML_DOCUMENT_NODE:
case XML_DOCUMENT_FRAG_NODE: /* should be processed as document? */
#ifdef LIBXML_HTML_ENABLED
case XML_HTML_DOCUMENT_NODE: /* should be processed as document? */
#endif
if (cur->children != NULL) {
ctx->pos = XMLC14N_BEFORE_DOCUMENT_ELEMENT;
ctx->parent_is_doc = 1;
ret = xmlC14NProcessNodeList(ctx, cur->children);
}
break;
case XML_ATTRIBUTE_NODE:
xmlC14NErrInvalidNode(ctx, "XML_ATTRIBUTE_NODE", "processing node");
return (-1);
case XML_NAMESPACE_DECL:
xmlC14NErrInvalidNode(ctx, "XML_NAMESPACE_DECL", "processing node");
return (-1);
case XML_ENTITY_REF_NODE:
xmlC14NErrInvalidNode(ctx, "XML_ENTITY_REF_NODE", "processing node");
return (-1);
case XML_ENTITY_NODE:
xmlC14NErrInvalidNode(ctx, "XML_ENTITY_NODE", "processing node");
return (-1);
case XML_DOCUMENT_TYPE_NODE:
case XML_NOTATION_NODE:
case XML_DTD_NODE:
case XML_ELEMENT_DECL:
case XML_ATTRIBUTE_DECL:
case XML_ENTITY_DECL:
#ifdef LIBXML_XINCLUDE_ENABLED
case XML_XINCLUDE_START:
case XML_XINCLUDE_END:
#endif
/*
* should be ignored according to "W3C Canonical XML"
*/
break;
default:
xmlC14NErrUnknownNode(ctx, cur->type, "processing node");
return (-1);
}
return (ret);
}
/**
* xmlC14NProcessNodeList:
* @ctx: the pointer to C14N context object
* @cur: the node to start from
*
* Processes all nodes in the row starting from cur.
*
* Returns non-negative value on success or negative value on fail
*/
static int
xmlC14NProcessNodeList(xmlC14NCtxPtr ctx, xmlNodePtr cur)
{
int ret;
if (ctx == NULL) {
xmlC14NErrParam(ctx);
return (-1);
}
for (ret = 0; cur != NULL && ret >= 0; cur = cur->next) {
ret = xmlC14NProcessNode(ctx, cur);
}
return (ret);
}
/**
* xmlC14NFreeCtx:
* @ctx: the pointer to C14N context object
*
* Cleanups the C14N context object.
*/
static void
xmlC14NFreeCtx(xmlC14NCtxPtr ctx)
{
if (ctx == NULL) {
xmlC14NErrParam(ctx);
return;
}
if (ctx->ns_rendered != NULL) {
xmlC14NVisibleNsStackDestroy(ctx->ns_rendered);
}
xmlFree(ctx);
}
/**
* xmlC14NNewCtx:
* @doc: the XML document for canonization
* @is_visible_callback:the function to use to determine is node visible
* or not
* @user_data: the first parameter for @is_visible_callback function
* (in most cases, it is nodes set)
* @mode: the c14n mode (see @xmlC14NMode)
* @inclusive_ns_prefixe the list of inclusive namespace prefixes
* ended with a NULL or NULL if there is no
* inclusive namespaces (only for `
* canonicalization)
* @with_comments: include comments in the result (!=0) or not (==0)
* @buf: the output buffer to store canonical XML; this
* buffer MUST have encoder==NULL because C14N requires
* UTF-8 output
*
* Creates new C14N context object to store C14N parameters.
*
* Returns pointer to newly created object (success) or NULL (fail)
*/
static xmlC14NCtxPtr
xmlC14NNewCtx(xmlDocPtr doc,
xmlC14NIsVisibleCallback is_visible_callback, void* user_data,
xmlC14NMode mode, xmlChar ** inclusive_ns_prefixes,
int with_comments, xmlOutputBufferPtr buf)
{
xmlC14NCtxPtr ctx = NULL;
if ((doc == NULL) || (buf == NULL)) {
xmlC14NErrParam(ctx);
return (NULL);
}
/*
* Validate the encoding output buffer encoding
*/
if (buf->encoder != NULL) {
xmlC14NErr(ctx, (xmlNodePtr) doc, XML_C14N_REQUIRES_UTF8,
"xmlC14NNewCtx: output buffer encoder != NULL but C14N requires UTF8 output\n");
return (NULL);
}
/*
* Allocate a new xmlC14NCtxPtr and fill the fields.
*/
ctx = (xmlC14NCtxPtr) xmlMalloc(sizeof(xmlC14NCtx));
if (ctx == NULL) {
xmlC14NErrMemory(ctx);
return (NULL);
}
memset(ctx, 0, sizeof(xmlC14NCtx));
/*
* initialize C14N context
*/
ctx->doc = doc;
ctx->with_comments = with_comments;
ctx->is_visible_callback = is_visible_callback;
ctx->user_data = user_data;
ctx->buf = buf;
ctx->parent_is_doc = 1;
ctx->pos = XMLC14N_BEFORE_DOCUMENT_ELEMENT;
ctx->ns_rendered = xmlC14NVisibleNsStackCreate();
if(ctx->ns_rendered == NULL) {
xmlC14NErrMemory(ctx);
xmlC14NFreeCtx(ctx);
return (NULL);
}
/*
* Set "mode" flag and remember list of inclusive prefixes
* for exclusive c14n
*/
ctx->mode = mode;
if(xmlC14NIsExclusive(ctx)) {
ctx->inclusive_ns_prefixes = inclusive_ns_prefixes;
}
return (ctx);
}
/**
* xmlC14NExecute:
* @doc: the XML document for canonization
* @is_visible_callback:the function to use to determine is node visible
* or not
* @user_data: the first parameter for @is_visible_callback function
* (in most cases, it is nodes set)
* @mode: the c14n mode (see @xmlC14NMode)
* @inclusive_ns_prefixes: the list of inclusive namespace prefixes
* ended with a NULL or NULL if there is no
* inclusive namespaces (only for exclusive
* canonicalization, ignored otherwise)
* @with_comments: include comments in the result (!=0) or not (==0)
* @buf: the output buffer to store canonical XML; this
* buffer MUST have encoder==NULL because C14N requires
* UTF-8 output
*
* Dumps the canonized image of given XML document into the provided buffer.
* For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
* "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
*
* Returns non-negative value on success or a negative value on fail
*/
int
xmlC14NExecute(xmlDocPtr doc, xmlC14NIsVisibleCallback is_visible_callback,
void* user_data, int mode, xmlChar **inclusive_ns_prefixes,
int with_comments, xmlOutputBufferPtr buf) {
xmlC14NCtxPtr ctx;
xmlC14NMode c14n_mode = XML_C14N_1_0;
int ret;
if ((buf == NULL) || (doc == NULL)) {
xmlC14NErrParam(NULL);
return (-1);
}
/* for backward compatibility, we have to have "mode" as "int"
and here we check that user gives valid value */
switch(mode) {
case XML_C14N_1_0:
case XML_C14N_EXCLUSIVE_1_0:
case XML_C14N_1_1:
c14n_mode = (xmlC14NMode)mode;
break;
default:
xmlC14NErrParam(NULL);
return (-1);
}
/*
* Validate the encoding output buffer encoding
*/
if (buf->encoder != NULL) {
xmlC14NErr(NULL, (xmlNodePtr) doc, XML_C14N_REQUIRES_UTF8,
"xmlC14NExecute: output buffer encoder != NULL but C14N requires UTF8 output\n");
return (-1);
}
ctx = xmlC14NNewCtx(doc, is_visible_callback, user_data,
c14n_mode, inclusive_ns_prefixes,
with_comments, buf);
if (ctx == NULL) {
xmlC14NErr(NULL, (xmlNodePtr) doc, XML_C14N_CREATE_CTXT,
"xmlC14NExecute: unable to create C14N context\n");
return (-1);
}
/*
* Root Node
* The root node is the parent of the top-level document element. The
* result of processing each of its child nodes that is in the node-set
* in document order. The root node does not generate a byte order mark,
* XML declaration, nor anything from within the document type
* declaration.
*/
if (doc->children != NULL) {
ret = xmlC14NProcessNodeList(ctx, doc->children);
if (ret < 0) {
xmlC14NFreeCtx(ctx);
return (-1);
}
}
/*
* Flush buffer to get number of bytes written
*/
ret = xmlOutputBufferFlush(buf);
if (ret < 0) {
xmlC14NErr(ctx, NULL, buf->error, "flushing output buffer");
xmlC14NFreeCtx(ctx);
return (-1);
}
/*
* Cleanup
*/
xmlC14NFreeCtx(ctx);
return (ret);
}
/**
* xmlC14NDocSaveTo:
* @doc: the XML document for canonization
* @nodes: the nodes set to be included in the canonized image
* or NULL if all document nodes should be included
* @mode: the c14n mode (see @xmlC14NMode)
* @inclusive_ns_prefixes: the list of inclusive namespace prefixes
* ended with a NULL or NULL if there is no
* inclusive namespaces (only for exclusive
* canonicalization, ignored otherwise)
* @with_comments: include comments in the result (!=0) or not (==0)
* @buf: the output buffer to store canonical XML; this
* buffer MUST have encoder==NULL because C14N requires
* UTF-8 output
*
* Dumps the canonized image of given XML document into the provided buffer.
* For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
* "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
*
* Returns non-negative value on success or a negative value on fail
*/
int
xmlC14NDocSaveTo(xmlDocPtr doc, xmlNodeSetPtr nodes,
int mode, xmlChar ** inclusive_ns_prefixes,
int with_comments, xmlOutputBufferPtr buf) {
return(xmlC14NExecute(doc,
xmlC14NIsNodeInNodeset,
nodes,
mode,
inclusive_ns_prefixes,
with_comments,
buf));
}
/**
* xmlC14NDocDumpMemory:
* @doc: the XML document for canonization
* @nodes: the nodes set to be included in the canonized image
* or NULL if all document nodes should be included
* @mode: the c14n mode (see @xmlC14NMode)
* @inclusive_ns_prefixes: the list of inclusive namespace prefixes
* ended with a NULL or NULL if there is no
* inclusive namespaces (only for exclusive
* canonicalization, ignored otherwise)
* @with_comments: include comments in the result (!=0) or not (==0)
* @doc_txt_ptr: the memory pointer for allocated canonical XML text;
* the caller of this functions is responsible for calling
* xmlFree() to free allocated memory
*
* Dumps the canonized image of given XML document into memory.
* For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
* "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
*
* Returns the number of bytes written on success or a negative value on fail
*/
int
xmlC14NDocDumpMemory(xmlDocPtr doc, xmlNodeSetPtr nodes,
int mode, xmlChar ** inclusive_ns_prefixes,
int with_comments, xmlChar ** doc_txt_ptr)
{
int ret;
xmlOutputBufferPtr buf;
if (doc_txt_ptr == NULL) {
xmlC14NErrParam(NULL);
return (-1);
}
*doc_txt_ptr = NULL;
/*
* create memory buffer with UTF8 (default) encoding
*/
buf = xmlAllocOutputBuffer(NULL);
if (buf == NULL) {
xmlC14NErrMemory(NULL);
return (-1);
}
/*
* canonize document and write to buffer
*/
ret = xmlC14NDocSaveTo(doc, nodes, mode, inclusive_ns_prefixes,
with_comments, buf);
if (ret < 0) {
(void) xmlOutputBufferClose(buf);
return (-1);
}
ret = xmlBufUse(buf->buffer);
if (ret >= 0) {
*doc_txt_ptr = xmlStrndup(xmlBufContent(buf->buffer), ret);
}
(void) xmlOutputBufferClose(buf);
if ((*doc_txt_ptr == NULL) && (ret >= 0)) {
xmlC14NErrMemory(NULL);
return (-1);
}
return (ret);
}
/**
* xmlC14NDocSave:
* @doc: the XML document for canonization
* @nodes: the nodes set to be included in the canonized image
* or NULL if all document nodes should be included
* @mode: the c14n mode (see @xmlC14NMode)
* @inclusive_ns_prefixes: the list of inclusive namespace prefixes
* ended with a NULL or NULL if there is no
* inclusive namespaces (only for exclusive
* canonicalization, ignored otherwise)
* @with_comments: include comments in the result (!=0) or not (==0)
* @filename: the filename to store canonical XML image
* @compression: the compression level (zlib required):
* -1 - libxml default,
* 0 - uncompressed,
* >0 - compression level
*
* Dumps the canonized image of given XML document into the file.
* For details see "Canonical XML" (http://www.w3.org/TR/xml-c14n) or
* "Exclusive XML Canonicalization" (http://www.w3.org/TR/xml-exc-c14n)
*
* Returns the number of bytes written success or a negative value on fail
*/
int
xmlC14NDocSave(xmlDocPtr doc, xmlNodeSetPtr nodes,
int mode, xmlChar ** inclusive_ns_prefixes,
int with_comments, const char *filename, int compression)
{
xmlOutputBufferPtr buf;
int ret;
if (filename == NULL) {
xmlC14NErrParam(NULL);
return (-1);
}
#ifdef LIBXML_ZLIB_ENABLED
if (compression < 0)
compression = xmlGetCompressMode();
#endif
/*
* save the content to a temp buffer, use default UTF8 encoding.
*/
buf = xmlOutputBufferCreateFilename(filename, NULL, compression);
if (buf == NULL) {
xmlC14NErr(NULL, NULL, XML_IO_UNKNOWN, "creating temporary filename");
return (-1);
}
/*
* canonize document and write to buffer
*/
ret = xmlC14NDocSaveTo(doc, nodes, mode, inclusive_ns_prefixes,
with_comments, buf);
if (ret < 0) {
(void) xmlOutputBufferClose(buf);
return (-1);
}
/*
* get the numbers of bytes written
*/
ret = xmlOutputBufferClose(buf);
return (ret);
}
/**
* xmlC11NNormalizeString:
* @input: the input string
* @mode: the normalization mode (attribute, comment, PI or text)
*
* Converts a string to a canonical (normalized) format. The code is stolen
* from xmlEncodeEntitiesReentrant(). Added normalization of \x09, \x0a, \x0A
* and the @mode parameter
*
* Returns a normalized string (caller is responsible for calling xmlFree())
* or NULL if an error occurs
*/
static xmlChar *
xmlC11NNormalizeString(const xmlChar * input,
xmlC14NNormalizationMode mode)
{
const xmlChar *cur = input;
xmlChar *buffer = NULL;
xmlChar *out = NULL;
int buffer_size = 0;
if (input == NULL)
return (NULL);
/*
* allocate an translation buffer.
*/
buffer_size = 1000;
buffer = (xmlChar *) xmlMallocAtomic(buffer_size);
if (buffer == NULL)
return (NULL);
out = buffer;
while (*cur != '\0') {
if ((out - buffer) > (buffer_size - 10)) {
xmlChar *tmp;
int indx = out - buffer;
buffer_size *= 2;
tmp = xmlRealloc(buffer, buffer_size);
if (tmp == NULL) {
xmlFree(buffer);
return(NULL);
}
buffer = tmp;
out = &buffer[indx];
}
if ((*cur == '<') && ((mode == XMLC14N_NORMALIZE_ATTR) ||
(mode == XMLC14N_NORMALIZE_TEXT))) {
*out++ = '&';
*out++ = 'l';
*out++ = 't';
*out++ = ';';
} else if ((*cur == '>') && (mode == XMLC14N_NORMALIZE_TEXT)) {
*out++ = '&';
*out++ = 'g';
*out++ = 't';
*out++ = ';';
} else if ((*cur == '&') && ((mode == XMLC14N_NORMALIZE_ATTR) ||
(mode == XMLC14N_NORMALIZE_TEXT))) {
*out++ = '&';
*out++ = 'a';
*out++ = 'm';
*out++ = 'p';
*out++ = ';';
} else if ((*cur == '"') && (mode == XMLC14N_NORMALIZE_ATTR)) {
*out++ = '&';
*out++ = 'q';
*out++ = 'u';
*out++ = 'o';
*out++ = 't';
*out++ = ';';
} else if ((*cur == '\x09') && (mode == XMLC14N_NORMALIZE_ATTR)) {
*out++ = '&';
*out++ = '#';
*out++ = 'x';
*out++ = '9';
*out++ = ';';
} else if ((*cur == '\x0A') && (mode == XMLC14N_NORMALIZE_ATTR)) {
*out++ = '&';
*out++ = '#';
*out++ = 'x';
*out++ = 'A';
*out++ = ';';
} else if ((*cur == '\x0D') && ((mode == XMLC14N_NORMALIZE_ATTR) ||
(mode == XMLC14N_NORMALIZE_TEXT) ||
(mode == XMLC14N_NORMALIZE_COMMENT) ||
(mode == XMLC14N_NORMALIZE_PI))) {
*out++ = '&';
*out++ = '#';
*out++ = 'x';
*out++ = 'D';
*out++ = ';';
} else {
/*
* Works because on UTF-8, all extended sequences cannot
* result in bytes in the ASCII range.
*/
*out++ = *cur;
}
cur++;
}
*out = 0;
return (buffer);
}
#endif /* LIBXML_C14N_ENABLED */
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