--- /dev/null
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* Copyright (C) 2001 by First Peer, Inc. All rights reserved.
+** Copyright (C) 2002 Ximian, Inc.
+**
+** 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>
+#ifdef WIN32
+#include <xmlparser.h>
+#else
+#include <libxml/parser.h>
+#endif
+
+#include "xmlrpc-c/base.h"
+#include "xmlrpc-c/base_int.h"
+#include "xmlrpc-c/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* */
+};
+
+#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. */
+ retval = NULL;
+ 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 = 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.
+*/
+
+const char *xml_element_name (const xml_element * const 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 (const xml_element *const elem)
+{
+ XMLRPC_ASSERT_ELEM_OK(elem);
+ return XMLRPC_TYPED_MEM_BLOCK_SIZE(xml_element*, &elem->_children);
+}
+
+xml_element **xml_element_children (const xml_element *const 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 libxml user data.
+**=========================================================================
+*/
+
+typedef struct {
+ xmlrpc_env *env;
+ xml_element *root;
+ xml_element *current;
+} parse_context;
+
+
+/*=========================================================================
+** LibXML Event Handler Functions
+**=========================================================================
+*/
+
+static void
+start_element (void *user_data, const xmlChar *name, const xmlChar **attrs)
+{
+ 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) {
+
+ /* Set up our error-handling preconditions. */
+ elem = NULL;
+
+ /* Build a new element. */
+ elem = xml_element_new(context->env, (char *) 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, const xmlChar *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, const xmlChar *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, (char *) s, len);
+ XMLRPC_FAIL_IF_FAULT(context->env);
+
+ cleanup:
+ return;
+ }
+}
+
+
+/*=========================================================================
+** LibXML Driver
+**=========================================================================
+** XXX - We should allow the user to specify the encoding of our xml_data.
+*/
+
+static xmlSAXHandler sax_handler = {
+ NULL, /* internalSubset */
+ NULL, /* isStandalone */
+ NULL, /* hasInternalSubset */
+ NULL, /* hasExternalSubset */
+ NULL, /* resolveEntity */
+ NULL, /* getEntity */
+ NULL, /* entityDecl */
+ NULL, /* notationDecl */
+ NULL, /* attributeDecl */
+ NULL, /* elementDecl */
+ NULL, /* unparsedEntityDecl */
+ NULL, /* setDocumentLocator */
+ NULL, /* startDocument */
+ NULL, /* endDocument */
+ start_element, /* startElement */
+ end_element, /* endElement */
+ NULL, /* reference */
+ character_data, /* characters */
+ NULL, /* ignorableWhitespace */
+ NULL, /* processingInstruction */
+ NULL, /* comment */
+ NULL, /* warning */
+ NULL, /* error */
+ NULL, /* fatalError */
+ NULL, /* getParameterEntity */
+ NULL, /* cdataBlock */
+ NULL, /* externalSubset */
+ 1 /* initialized */
+
+ /* Following are SAX2 fields. Any ifdef here? */
+
+ ,NULL, /* _private */
+ NULL, /* startElementNs */
+ NULL, /* endElementNs */
+ NULL /* serror */
+};
+
+
+
+void
+xml_parse(xmlrpc_env * const envP,
+ const char * const xmlData,
+ size_t const xmlDataLen,
+ xml_element ** const resultPP) {
+
+ parse_context context;
+ xmlParserCtxt *parser;
+ int err;
+
+ XMLRPC_ASSERT_ENV_OK(envP);
+ XMLRPC_ASSERT(xmlData != NULL && xmlDataLen >= 0);
+
+ /* Set up our error-handling preconditions. */
+ parser = NULL;
+ context.root = NULL;
+
+ /* Set up the rest of our parse context. */
+ context.env = envP;
+ context.current = NULL;
+
+ /* Set up our XML parser. */
+ parser = xmlCreatePushParserCtxt(&sax_handler, &context, NULL, 0, NULL);
+ XMLRPC_FAIL_IF_NULL(parser, envP, XMLRPC_INTERNAL_ERROR,
+ "Could not create expat parser");
+
+ /* Parse our data. */
+ err = xmlParseChunk(parser, xmlData, xmlDataLen, 1);
+ if (err)
+ XMLRPC_FAIL(envP, XMLRPC_PARSE_ERROR, "XML parsing failed");
+ XMLRPC_FAIL_IF_FAULT(envP);
+
+ /* Perform some sanity checks. */
+ XMLRPC_ASSERT(context.root != NULL);
+ XMLRPC_ASSERT(context.current == NULL);
+
+ *resultPP = context.root;
+
+ cleanup:
+ if (parser)
+ xmlFreeParserCtxt(parser);
+
+ if (envP->fault_occurred) {
+ if (context.root)
+ xml_element_free(context.root);
+ }
+}
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