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c14n.c
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c14n.c
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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 <[email protected]>
*/
#define IN_LIBXML
#include "libxml.h"
#ifdef LIBXML_C14N_ENABLED
#ifdef LIBXML_OUTPUT_ENABLED
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <string.h>
#include <libxml/tree.h>
#include <libxml/parser.h>
#include <libxml/uri.h>
#include <libxml/xmlerror.h>
#include <libxml/globals.h>
#include <libxml/xpathInternals.h>
#include <libxml/c14n.h>
#include "buf.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 void 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(const char *extra)
{
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
XML_ERR_NO_MEMORY, XML_ERR_ERROR, NULL, 0, extra,
NULL, NULL, 0, 0,
"Memory allocation failed : %s\n", extra);
}
/**
* xmlC14NErrParam:
* @extra: extra information
*
* Handle a redefinition of param error
*/
static void
xmlC14NErrParam(const char *extra)
{
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
XML_ERR_INTERNAL_ERROR, XML_ERR_ERROR, NULL, 0, extra,
NULL, NULL, 0, 0,
"Invalid parameter : %s\n", extra);
}
/**
* xmlC14NErrInternal:
* @extra: extra information
*
* Handle a redefinition of internal error
*/
static void
xmlC14NErrInternal(const char *extra)
{
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
XML_ERR_INTERNAL_ERROR, XML_ERR_ERROR, NULL, 0, extra,
NULL, NULL, 0, 0,
"Internal error : %s\n", extra);
}
/**
* xmlC14NErrInvalidNode:
* @extra: extra information
*
* Handle a redefinition of invalid node error
*/
static void
xmlC14NErrInvalidNode(const char *node_type, const char *extra)
{
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
XML_C14N_INVALID_NODE, XML_ERR_ERROR, NULL, 0, extra,
NULL, NULL, 0, 0,
"Node %s is invalid here : %s\n", node_type, extra);
}
/**
* xmlC14NErrUnknownNode:
* @extra: extra information
*
* Handle a redefinition of unknown node error
*/
static void
xmlC14NErrUnknownNode(int node_type, const char *extra)
{
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
XML_C14N_UNKNOW_NODE, XML_ERR_ERROR, NULL, 0, extra,
NULL, NULL, 0, 0,
"Unknown node type %d found : %s\n", node_type, extra);
}
/**
* xmlC14NErrRelativeNamespace:
* @extra: extra information
*
* Handle a redefinition of relative namespace error
*/
static void
xmlC14NErrRelativeNamespace(const char *ns_uri)
{
__xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_C14N,
XML_C14N_RELATIVE_NAMESPACE, XML_ERR_ERROR, NULL, 0, NULL,
NULL, NULL, 0, 0,
"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 a redefinition of attribute error
*/
static void
xmlC14NErr(xmlC14NCtxPtr ctxt, xmlNodePtr node, int error,
const char * msg)
{
if (ctxt != NULL)
ctxt->error = error;
__xmlRaiseError(NULL, NULL, NULL,
ctxt, node, XML_FROM_C14N, error,
XML_ERR_ERROR, NULL, 0,
NULL, NULL, NULL, 0, 0, "%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) {
xmlC14NErrMemory("creating namespaces stack");
return(NULL);
}
memset(ret, 0 , (size_t) sizeof(xmlC14NVisibleNsStack));
return(ret);
}
static void
xmlC14NVisibleNsStackDestroy(xmlC14NVisibleNsStackPtr cur) {
if(cur == NULL) {
xmlC14NErrParam("destroying namespaces stack");
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 void
xmlC14NVisibleNsStackAdd(xmlC14NVisibleNsStackPtr cur, xmlNsPtr ns, xmlNodePtr node) {
if((cur == NULL) ||
((cur->nsTab == NULL) && (cur->nodeTab != NULL)) ||
((cur->nsTab != NULL) && (cur->nodeTab == NULL))) {
xmlC14NErrParam("adding namespace to stack");
return;
}
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)) {
xmlC14NErrMemory("adding node to stack");
return;
}
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) {
xmlC14NErrMemory("adding node to stack");
return;
}
cur->nsTab = (xmlNsPtr*)tmp;
tmp = xmlRealloc(cur->nodeTab, tmpSize * sizeof(xmlNodePtr));
if (tmp == NULL) {
xmlC14NErrMemory("adding node to stack");
return;
}
cur->nodeTab = (xmlNodePtr*)tmp;
cur->nsMax = tmpSize;
}
cur->nsTab[cur->nsCurEnd] = ns;
cur->nodeTab[cur->nsCurEnd] = node;
++cur->nsCurEnd;
}
static void
xmlC14NVisibleNsStackSave(xmlC14NVisibleNsStackPtr cur, xmlC14NVisibleNsStackPtr state) {
if((cur == NULL) || (state == NULL)) {
xmlC14NErrParam("saving namespaces stack");
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("restoring namespaces stack");
return;
}
cur->nsCurEnd = state->nsCurEnd;
cur->nsPrevStart = state->nsPrevStart;
cur->nsPrevEnd = state->nsPrevEnd;
}
static void
xmlC14NVisibleNsStackShift(xmlC14NVisibleNsStackPtr cur) {
if(cur == NULL) {
xmlC14NErrParam("shifting namespaces stack");
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("searching namespaces stack (c14n)");
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("searching namespaces stack (exc c14n)");
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 xmlNsPtr ns1 = (const xmlNsPtr) data1;
const xmlNsPtr ns2 = (const xmlNsPtr) 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 xmlNsPtr ns, xmlC14NCtxPtr ctx)
{
if ((ns == NULL) || (ctx == NULL)) {
xmlC14NErrParam("writing namespaces");
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) {
xmlBufWriteQuotedString(ctx->buf->buffer, ns->href);
} else {
xmlOutputBufferWriteString(ctx->buf, "\"\"");
}
return (1);
}
static int
xmlC14NPrintNamespacesWalker(const void *ns, void *ctx) {
return xmlC14NPrintNamespaces((const xmlNsPtr) ns, (xmlC14NCtxPtr) 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("processing namespaces axis (c14n)");
return (-1);
}
/*
* Create a sorted list to store element namespaces
*/
list = xmlListCreate(NULL, xmlC14NNsCompare);
if (list == NULL) {
xmlC14NErrInternal("creating namespaces list (c14n)");
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) {
xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur);
}
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
*/
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("processing namespaces axis (exc c14n)");
return (-1);
}
if(!xmlC14NIsExclusive(ctx)) {
xmlC14NErrParam("processing namespaces axis (exc c14n)");
return (-1);
}
/*
* Create a sorted list to store element namespaces
*/
list = xmlListCreate(NULL, xmlC14NNsCompare);
if (list == NULL) {
xmlC14NErrInternal("creating namespaces list (exc c14n)");
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) {
xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur);
}
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) {
xmlC14NVisibleNsStackAdd(ctx->ns_rendered, ns, cur);
}
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);
xmlC14NVisibleNsStackAdd(ctx->ns_rendered, attr->ns, cur);
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
*/
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 xmlAttrPtr attr1 = (const xmlAttrPtr) data1;
const xmlAttrPtr attr2 = (const xmlAttrPtr) 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 xmlAttrPtr attr = (const xmlAttrPtr) data;
xmlC14NCtxPtr ctx = (xmlC14NCtxPtr) user;
xmlChar *value;
xmlChar *buffer;
if ((attr == NULL) || (ctx == NULL)) {
xmlC14NErrParam("writing attributes");
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 {
xmlC14NErrInternal("normalizing attributes axis");
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;
}