You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
391 lines
12 KiB
391 lines
12 KiB
/* Copyright (C) 2001 by First Peer, Inc. All rights reserved.
|
|
**
|
|
** Redistribution and use in source and binary forms, with or without
|
|
** modification, are permitted provided that the following conditions
|
|
** are met:
|
|
** 1. Redistributions of source code must retain the above copyright
|
|
** notice, this list of conditions and the following disclaimer.
|
|
** 2. Redistributions in binary form must reproduce the above copyright
|
|
** notice, this list of conditions and the following disclaimer in the
|
|
** documentation and/or other materials provided with the distribution.
|
|
** 3. The name of the author may not be used to endorse or promote products
|
|
** derived from this software without specific prior written permission.
|
|
**
|
|
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
** SUCH DAMAGE. */
|
|
|
|
#include "xmlrpc_config.h"
|
|
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <cm_expat.h>
|
|
|
|
#include "xmlrpc.h"
|
|
#include "xmlrpc_int.h"
|
|
#include "xmlrpc_xmlparser.h"
|
|
|
|
/* Define the contents of our internal structure. */
|
|
struct _xml_element {
|
|
struct _xml_element *_parent;
|
|
char *_name;
|
|
xmlrpc_mem_block _cdata; /* char */
|
|
xmlrpc_mem_block _children; /* xml_element* */
|
|
};
|
|
|
|
/* Check that we're using expat in UTF-8 mode, not wchar_t mode.
|
|
** If you need to use expat in wchar_t mode, write a subroutine to
|
|
** copy a wchar_t string to a char string & return an error for
|
|
** any non-ASCII characters. Then call this subroutine on all
|
|
** XML_Char strings passed to our event handlers before using the
|
|
** data. */
|
|
/* #if sizeof(char) != sizeof(XML_Char)
|
|
** #error expat must define XML_Char to be a regular char.
|
|
** #endif
|
|
*/
|
|
|
|
#define XMLRPC_ASSERT_ELEM_OK(elem) \
|
|
XMLRPC_ASSERT((elem) != NULL && (elem)->_name != XMLRPC_BAD_POINTER)
|
|
|
|
|
|
/*=========================================================================
|
|
** xml_element_new
|
|
**=========================================================================
|
|
** Create a new xml_element. This routine isn't exported, because the
|
|
** arguments are implementation-dependent.
|
|
*/
|
|
|
|
static xml_element *xml_element_new (xmlrpc_env *env, char *name)
|
|
{
|
|
xml_element *retval;
|
|
int name_valid, cdata_valid, children_valid;
|
|
|
|
XMLRPC_ASSERT_ENV_OK(env);
|
|
XMLRPC_ASSERT(name != NULL);
|
|
|
|
/* Set up our error-handling preconditions. */
|
|
name_valid = cdata_valid = children_valid = 0;
|
|
|
|
/* Allocate our xml_element structure. */
|
|
retval = (xml_element*) malloc(sizeof(xml_element));
|
|
XMLRPC_FAIL_IF_NULL(retval, env, XMLRPC_INTERNAL_ERROR,
|
|
"Couldn't allocate memory for XML element");
|
|
|
|
/* Set our parent field to NULL. */
|
|
retval->_parent = NULL;
|
|
|
|
/* Copy over the element name. */
|
|
retval->_name = (char*) malloc(strlen(name) + 1);
|
|
XMLRPC_FAIL_IF_NULL(retval->_name, env, XMLRPC_INTERNAL_ERROR,
|
|
"Couldn't allocate memory for XML element");
|
|
name_valid = 1;
|
|
strcpy(retval->_name, name);
|
|
|
|
/* Initialize a block to hold our CDATA. */
|
|
XMLRPC_TYPED_MEM_BLOCK_INIT(char, env, &retval->_cdata, 0);
|
|
XMLRPC_FAIL_IF_FAULT(env);
|
|
cdata_valid = 1;
|
|
|
|
/* Initialize a block to hold our child elements. */
|
|
XMLRPC_TYPED_MEM_BLOCK_INIT(xml_element*, env, &retval->_children, 0);
|
|
XMLRPC_FAIL_IF_FAULT(env);
|
|
children_valid = 1;
|
|
|
|
cleanup:
|
|
if (env->fault_occurred) {
|
|
if (retval) {
|
|
if (name_valid)
|
|
free(retval->_name);
|
|
if (cdata_valid)
|
|
xmlrpc_mem_block_clean(&retval->_cdata);
|
|
if (children_valid)
|
|
xmlrpc_mem_block_clean(&retval->_children);
|
|
free(retval);
|
|
}
|
|
return NULL;
|
|
} else {
|
|
return retval;
|
|
}
|
|
}
|
|
|
|
|
|
/*=========================================================================
|
|
** xml_element_free
|
|
**=========================================================================
|
|
** Blow away an existing element & all of its child elements.
|
|
*/
|
|
|
|
void xml_element_free (xml_element *elem)
|
|
{
|
|
xmlrpc_mem_block *children;
|
|
int size, i;
|
|
xml_element **contents;
|
|
|
|
XMLRPC_ASSERT_ELEM_OK(elem);
|
|
|
|
free(elem->_name);
|
|
elem->_name = XMLRPC_BAD_POINTER;
|
|
xmlrpc_mem_block_clean(&elem->_cdata);
|
|
|
|
/* Deallocate all of our children recursively. */
|
|
children = &elem->_children;
|
|
contents = XMLRPC_TYPED_MEM_BLOCK_CONTENTS(xml_element*, children);
|
|
size = (int)XMLRPC_TYPED_MEM_BLOCK_SIZE(xml_element*, children);
|
|
for (i = 0; i < size; i++)
|
|
xml_element_free(contents[i]);
|
|
|
|
xmlrpc_mem_block_clean(&elem->_children);
|
|
free(elem);
|
|
}
|
|
|
|
|
|
/*=========================================================================
|
|
** Miscellaneous Accessors
|
|
**=========================================================================
|
|
** Return the fields of the xml_element. See the header for more
|
|
** documentation on each function works.
|
|
*/
|
|
|
|
char *xml_element_name (xml_element *elem)
|
|
{
|
|
XMLRPC_ASSERT_ELEM_OK(elem);
|
|
return elem->_name;
|
|
}
|
|
|
|
/* The result of this function is NOT VALID until the end_element handler
|
|
** has been called! */
|
|
size_t xml_element_cdata_size (xml_element *elem)
|
|
{
|
|
XMLRPC_ASSERT_ELEM_OK(elem);
|
|
return XMLRPC_TYPED_MEM_BLOCK_SIZE(char, &elem->_cdata) - 1;
|
|
}
|
|
|
|
char *xml_element_cdata (xml_element *elem)
|
|
{
|
|
XMLRPC_ASSERT_ELEM_OK(elem);
|
|
return XMLRPC_TYPED_MEM_BLOCK_CONTENTS(char, &elem->_cdata);
|
|
}
|
|
|
|
size_t xml_element_children_size (xml_element *elem)
|
|
{
|
|
XMLRPC_ASSERT_ELEM_OK(elem);
|
|
return XMLRPC_TYPED_MEM_BLOCK_SIZE(xml_element*, &elem->_children);
|
|
}
|
|
|
|
xml_element **xml_element_children (xml_element *elem)
|
|
{
|
|
XMLRPC_ASSERT_ELEM_OK(elem);
|
|
return XMLRPC_TYPED_MEM_BLOCK_CONTENTS(xml_element*, &elem->_children);
|
|
}
|
|
|
|
|
|
/*=========================================================================
|
|
** Internal xml_element Utility Functions
|
|
**=========================================================================
|
|
*/
|
|
|
|
static void xml_element_append_cdata (xmlrpc_env *env,
|
|
xml_element *elem,
|
|
char *cdata,
|
|
size_t size)
|
|
{
|
|
XMLRPC_ASSERT_ENV_OK(env);
|
|
XMLRPC_ASSERT_ELEM_OK(elem);
|
|
|
|
XMLRPC_TYPED_MEM_BLOCK_APPEND(char, env, &elem->_cdata, cdata, size);
|
|
}
|
|
|
|
/* Whether or not this function succeeds, it takes ownership of the 'child'
|
|
** argument.
|
|
** WARNING - This is the exact opposite of the usual memory ownership
|
|
** rules for xmlrpc_value! So please pay attention. */
|
|
static void xml_element_append_child (xmlrpc_env *env,
|
|
xml_element *elem,
|
|
xml_element *child)
|
|
{
|
|
XMLRPC_ASSERT_ENV_OK(env);
|
|
XMLRPC_ASSERT_ELEM_OK(elem);
|
|
XMLRPC_ASSERT_ELEM_OK(child);
|
|
XMLRPC_ASSERT(child->_parent == NULL);
|
|
|
|
XMLRPC_TYPED_MEM_BLOCK_APPEND(xml_element*, env, &elem->_children,
|
|
&child, 1);
|
|
if (!env->fault_occurred)
|
|
child->_parent = elem;
|
|
else
|
|
xml_element_free(child);
|
|
}
|
|
|
|
|
|
/*=========================================================================
|
|
** Our parse context. We pass this around as expat user data.
|
|
**=========================================================================
|
|
*/
|
|
|
|
typedef struct {
|
|
xmlrpc_env *env;
|
|
xml_element *root;
|
|
xml_element *current;
|
|
} parse_context;
|
|
|
|
|
|
/*=========================================================================
|
|
** Expat Event Handler Functions
|
|
**=========================================================================
|
|
*/
|
|
|
|
static void
|
|
start_element (void *user_data, XML_Char *name, XML_Char **atts ATTR_UNUSED)
|
|
{
|
|
parse_context *context;
|
|
xml_element *elem, *new_current;
|
|
|
|
XMLRPC_ASSERT(user_data != NULL && name != NULL);
|
|
|
|
/* Get our context and see if an error has already occured. */
|
|
context = (parse_context*) user_data;
|
|
if (!context->env->fault_occurred) {
|
|
|
|
/* Build a new element. */
|
|
elem = xml_element_new(context->env, name);
|
|
XMLRPC_FAIL_IF_FAULT(context->env);
|
|
|
|
/* Insert it in the appropriate place. */
|
|
if (!context->root) {
|
|
context->root = elem;
|
|
context->current = elem;
|
|
elem = NULL;
|
|
} else {
|
|
XMLRPC_ASSERT(context->current != NULL);
|
|
|
|
/* (We need to watch our error handling invariants very carefully
|
|
** here. Read the docs for xml_element_append_child. */
|
|
new_current = elem;
|
|
xml_element_append_child(context->env, context->current, elem);
|
|
elem = NULL;
|
|
XMLRPC_FAIL_IF_FAULT(context->env);
|
|
context->current = new_current;
|
|
}
|
|
|
|
cleanup:
|
|
if (elem)
|
|
xml_element_free(elem);
|
|
}
|
|
}
|
|
|
|
static void end_element (void *user_data, XML_Char *name)
|
|
{
|
|
parse_context *context;
|
|
|
|
XMLRPC_ASSERT(user_data != NULL && name != NULL);
|
|
|
|
/* Get our context and see if an error has already occured. */
|
|
context = (parse_context*) user_data;
|
|
if (!context->env->fault_occurred) {
|
|
|
|
/* XXX - I think expat enforces these facts, but I want to be sure.
|
|
** If one of these assertion ever fails, it should be replaced by a
|
|
** non-assertion runtime error check. */
|
|
XMLRPC_ASSERT(strcmp(name, context->current->_name) == 0);
|
|
XMLRPC_ASSERT(context->current->_parent != NULL ||
|
|
context->current == context->root);
|
|
|
|
/* Add a trailing '\0' to our cdata. */
|
|
xml_element_append_cdata(context->env, context->current, "\0", 1);
|
|
XMLRPC_FAIL_IF_FAULT(context->env);
|
|
|
|
/* Pop our "stack" of elements. */
|
|
context->current = context->current->_parent;
|
|
|
|
cleanup:
|
|
return;
|
|
}
|
|
}
|
|
|
|
static void character_data (void *user_data, XML_Char *s, int len)
|
|
{
|
|
parse_context *context;
|
|
|
|
XMLRPC_ASSERT(user_data != NULL && s != NULL && len >= 0);
|
|
|
|
/* Get our context and see if an error has already occured. */
|
|
context = (parse_context*) user_data;
|
|
if (!context->env->fault_occurred) {
|
|
|
|
XMLRPC_ASSERT(context->current != NULL);
|
|
|
|
xml_element_append_cdata(context->env, context->current, s, len);
|
|
XMLRPC_FAIL_IF_FAULT(context->env);
|
|
|
|
cleanup:
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/*=========================================================================
|
|
** Expat Driver
|
|
**=========================================================================
|
|
** XXX - We should allow the user to specify the encoding of our xml_data.
|
|
*/
|
|
|
|
xml_element *xml_parse (xmlrpc_env *env, const char *xml_data, int xml_len)
|
|
{
|
|
parse_context context;
|
|
XML_Parser parser;
|
|
int ok;
|
|
|
|
XMLRPC_ASSERT_ENV_OK(env);
|
|
XMLRPC_ASSERT(xml_data != NULL && xml_len >= 0);
|
|
|
|
/* Set up our error-handling preconditions. */
|
|
context.root = NULL;
|
|
|
|
/* Set up the rest of our parse context. */
|
|
context.env = env;
|
|
context.current = NULL;
|
|
|
|
/* Set up our XML parser. */
|
|
parser = XML_ParserCreate(NULL);
|
|
XMLRPC_FAIL_IF_NULL(parser, env, XMLRPC_INTERNAL_ERROR,
|
|
"Could not create expat parser");
|
|
XML_SetUserData(parser, &context);
|
|
XML_SetElementHandler(parser,
|
|
(XML_StartElementHandler) start_element,
|
|
(XML_EndElementHandler) end_element);
|
|
XML_SetCharacterDataHandler(parser,
|
|
(XML_CharacterDataHandler) character_data);
|
|
|
|
/* Parse our data. */
|
|
ok = XML_Parse(parser, xml_data, xml_len, 1);
|
|
if (!ok)
|
|
XMLRPC_FAIL(env, XMLRPC_PARSE_ERROR,
|
|
(char*) XML_ErrorString(XML_GetErrorCode(parser)));
|
|
XMLRPC_FAIL_IF_FAULT(env);
|
|
|
|
/* Perform some sanity checks. */
|
|
XMLRPC_ASSERT(context.root != NULL);
|
|
XMLRPC_ASSERT(context.current == NULL);
|
|
|
|
cleanup:
|
|
if (parser)
|
|
XML_ParserFree(parser);
|
|
|
|
if (env->fault_occurred) {
|
|
if (context.root)
|
|
xml_element_free(context.root);
|
|
return NULL;
|
|
} else {
|
|
return context.root;
|
|
}
|
|
}
|