+++ /dev/null
-/** **************************************************************************
- * simplexml.c
- *
- * Copyright 2008 Bryan Ischo <bryan@ischo.com>
- *
- * This file is part of libs3.
- *
- * libs3 is free software: you can redistribute it and/or modify it under the
- * terms of the GNU General Public License as published by the Free Software
- * Foundation, version 3 of the License.
- *
- * In addition, as a special exception, the copyright holders give
- * permission to link the code of this library and its programs with the
- * OpenSSL library, and distribute linked combinations including the two.
- *
- * libs3 is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
- * details.
- *
- * You should have received a copy of the GNU General Public License version 3
- * along with libs3, in a file named COPYING. If not, see
- * <http://www.gnu.org/licenses/>.
- *
- ************************************************************************** **/
-
-#include <libxml/parser.h>
-#include <string.h>
-#include "simplexml.h"
-
-// Use libxml2 for parsing XML. XML is severely overused in modern
-// computing. It is useful for only a very small subset of tasks, but
-// software developers who don't know better and are afraid to go against the
-// grain use it for everything, and in most cases, it is completely
-// inappropriate. Usually, the document structure is severely under-specified
-// as well, as is the case with S3. We do our best by just caring about the
-// most important aspects of the S3 "XML document" responses: the elements and
-// their values. The SAX API (just about the lamest API ever devised and
-// proof that XML sucks - well, the real proof is how crappy all of the XML
-// parsing libraries are, including libxml2 - but I digress) is used here
-// because we don't need much from the parser and SAX is fast and low memory.
-//
-// Note that for simplicity we assume all ASCII here. No attempts are made to
-// detect non-ASCII sequences in utf-8 and convert them into ASCII in any way.
-// S3 appears to only use ASCII anyway.
-
-
-static xmlEntityPtr saxGetEntity(void *user_data, const xmlChar *name)
-{
- (void) user_data;
-
- return xmlGetPredefinedEntity(name);
-}
-
-
-static void saxStartElement(void *user_data, const xmlChar *nameUtf8,
- const xmlChar **attr)
-{
- (void) attr;
-
- SimpleXml *simpleXml = (SimpleXml *) user_data;
-
- if (simpleXml->status != S3StatusOK) {
- return;
- }
-
- // Assume that name has no non-ASCII in it
- char *name = (char *) nameUtf8;
-
- // Append the element to the element path
- int len = strlen(name);
-
- if ((simpleXml->elementPathLen + len + 1) >=
- (int) sizeof(simpleXml->elementPath)) {
- // Cannot handle this element, stop!
- simpleXml->status = S3StatusXmlParseFailure;
- return;
- }
-
- if (simpleXml->elementPathLen) {
- simpleXml->elementPath[simpleXml->elementPathLen++] = '/';
- }
- strcpy(&(simpleXml->elementPath[simpleXml->elementPathLen]), name);
- simpleXml->elementPathLen += len;
-}
-
-
-static void saxEndElement(void *user_data, const xmlChar *name)
-{
- (void) name;
-
- SimpleXml *simpleXml = (SimpleXml *) user_data;
-
- if (simpleXml->status != S3StatusOK) {
- return;
- }
-
- // Call back with 0 data
- simpleXml->status = (*(simpleXml->callback))
- (simpleXml->elementPath, 0, 0, simpleXml->callbackData);
-
- while ((simpleXml->elementPathLen > 0) &&
- (simpleXml->elementPath[simpleXml->elementPathLen] != '/')) {
- simpleXml->elementPathLen--;
- }
-
- simpleXml->elementPath[simpleXml->elementPathLen] = 0;
-}
-
-
-static void saxCharacters(void *user_data, const xmlChar *ch, int len)
-{
- SimpleXml *simpleXml = (SimpleXml *) user_data;
-
- if (simpleXml->status != S3StatusOK) {
- return;
- }
-
- simpleXml->status = (*(simpleXml->callback))
- (simpleXml->elementPath, (char *) ch, len, simpleXml->callbackData);
-}
-
-
-static void saxError(void *user_data, const char *msg, ...)
-{
- (void) msg;
-
- SimpleXml *simpleXml = (SimpleXml *) user_data;
-
- if (simpleXml->status != S3StatusOK) {
- return;
- }
-
- simpleXml->status = S3StatusXmlParseFailure;
-}
-
-
-static struct _xmlSAXHandler saxHandlerG =
-{
- 0, // internalSubsetSAXFunc
- 0, // isStandaloneSAXFunc
- 0, // hasInternalSubsetSAXFunc
- 0, // hasExternalSubsetSAXFunc
- 0, // resolveEntitySAXFunc
- &saxGetEntity, // getEntitySAXFunc
- 0, // entityDeclSAXFunc
- 0, // notationDeclSAXFunc
- 0, // attributeDeclSAXFunc
- 0, // elementDeclSAXFunc
- 0, // unparsedEntityDeclSAXFunc
- 0, // setDocumentLocatorSAXFunc
- 0, // startDocumentSAXFunc
- 0, // endDocumentSAXFunc
- &saxStartElement, // startElementSAXFunc
- &saxEndElement, // endElementSAXFunc
- 0, // referenceSAXFunc
- &saxCharacters, // charactersSAXFunc
- 0, // ignorableWhitespaceSAXFunc
- 0, // processingInstructionSAXFunc
- 0, // commentSAXFunc
- 0, // warningSAXFunc
- &saxError, // errorSAXFunc
- &saxError, // fatalErrorSAXFunc
- 0, // getParameterEntitySAXFunc
- &saxCharacters, // cdataBlockSAXFunc
- 0, // externalSubsetSAXFunc
- 0, // initialized
- 0, // _private
- 0, // startElementNsSAX2Func
- 0, // endElementNsSAX2Func
- 0 // xmlStructuredErrorFunc serror;
-};
-
-void simplexml_initialize(SimpleXml *simpleXml,
- SimpleXmlCallback *callback, void *callbackData)
-{
- simpleXml->callback = callback;
- simpleXml->callbackData = callbackData;
- simpleXml->elementPathLen = 0;
- simpleXml->status = S3StatusOK;
- simpleXml->xmlParser = 0;
-}
-
-
-void simplexml_deinitialize(SimpleXml *simpleXml)
-{
- if (simpleXml->xmlParser) {
- xmlFreeParserCtxt(simpleXml->xmlParser);
- }
-}
-
-
-S3Status simplexml_add(SimpleXml *simpleXml, const char *data, int dataLen)
-{
- if (!simpleXml->xmlParser &&
- (!(simpleXml->xmlParser = xmlCreatePushParserCtxt
- (&saxHandlerG, simpleXml, 0, 0, 0)))) {
- return S3StatusInternalError;
- }
-
- if (xmlParseChunk((xmlParserCtxtPtr) simpleXml->xmlParser,
- data, dataLen, 0)) {
- return S3StatusXmlParseFailure;
- }
-
- return simpleXml->status;
-}
projects / bluesky.git / blobdiff