/*
* flickcurl_invoke_photos_list:
* @fc: Flickcurl context
* @xpathExpr: Xpath to the list of photos e.g. '/rsp/photos' or '/rsp/gallery'. The /photos suffix is added internally.
* @format: result format wanted
*
* INTERNAL - Build photos list from XML or get format content result from web service response document
*
* Return value: new photos list or NULL on failure
*/
flickcurl_photos_list*
flickcurl_invoke_photos_list(flickcurl* fc, const xmlChar* xpathExpr,
const char* format)
{
flickcurl_photos_list* photos_list = NULL;
xmlXPathContextPtr xpathCtx = NULL;
xmlXPathObjectPtr xpathObj = NULL;
xmlXPathContextPtr xpathNodeCtx = NULL;
const char *nformat;
size_t format_len;
photos_list = (flickcurl_photos_list*)calloc(1, sizeof(*photos_list));
if(!photos_list) {
fc->failed = 1;
goto tidy;
}
photos_list->page = -1;
photos_list->per_page = -1;
photos_list->total_count = -1;
if(format) {
nformat = format;
format_len = strlen(format);
photos_list->content = flickcurl_invoke_get_content(fc,
&photos_list->content_length);
if(!photos_list->content) {
fc->failed = 1;
goto tidy;
}
} else {
xmlDocPtr doc = NULL;
xmlNodePtr photos_node;
size_t xpathExprLen = strlen((const char*)xpathExpr);
char* value;
xmlChar* photosXpathExpr;
#define SUFFIX "/photo"
#define SUFFIX_LEN 6
nformat = "xml";
format_len = 3;
doc = flickcurl_invoke(fc);
if(!doc)
goto tidy;
xpathCtx = xmlXPathNewContext(doc);
if(!xpathCtx) {
flickcurl_error(fc, "Failed to create XPath context for document");
fc->failed = 1;
goto tidy;
}
/* set up a new XPath context for the top level list-of-photos
* XML element. It may be <photos> or <gallery> or ... - the
* code does not care.
*/
xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx);
if(!xpathObj) {
flickcurl_error(fc, "Unable to evaluate XPath expression \"%s\"",
xpathExpr);
fc->failed = 1;
goto tidy;
}
if(!xpathObj->nodesetval || !xpathObj->nodesetval->nodeTab) {
/* No <photo> elements found in content - not a failure */
goto tidy;
}
photos_node = xpathObj->nodesetval->nodeTab[0];
xpathNodeCtx = xmlXPathNewContext(xpathCtx->doc);
if(!xpathNodeCtx) {
flickcurl_error(fc, "Unable to create XPath context for XPath \"%s\"",
xpathExpr);
fc->failed = 1;
goto tidy;
}
xpathNodeCtx->node = photos_node;
value = flickcurl_xpath_eval(fc, xpathNodeCtx,
(const xmlChar*)"./@page");
if(value) {
photos_list->page = atoi(value);
free(value);
}
value = flickcurl_xpath_eval(fc, xpathNodeCtx,
(const xmlChar*)"./@perpage");
if(value) {
photos_list->per_page = atoi(value);
free(value);
}
value = flickcurl_xpath_eval(fc, xpathNodeCtx,
(const xmlChar*)"./@total");
if(value) {
photos_list->total_count = atoi(value);
free(value);
}
/* finished with these */
xmlXPathFreeContext(xpathNodeCtx);
xpathNodeCtx = NULL;
xmlXPathFreeObject(xpathObj);
xpathObj = NULL;
photosXpathExpr = (xmlChar*)malloc(xpathExprLen + SUFFIX_LEN + 1);
memcpy(photosXpathExpr, xpathExpr, xpathExprLen);
memcpy(photosXpathExpr + xpathExprLen, SUFFIX, SUFFIX_LEN + 1);
photos_list->photos = flickcurl_build_photos(fc, xpathCtx, photosXpathExpr,
&photos_list->photos_count);
if(!photos_list->photos) {
fc->failed = 1;
goto tidy;
}
}
photos_list->format = (char*)malloc(format_len+1);
if(!photos_list->format) {
fc->failed = 1;
goto tidy;
}
memcpy(photos_list->format, nformat, format_len+1);
tidy:
if(xpathNodeCtx)
xmlXPathFreeContext(xpathNodeCtx);
if(xpathObj)
xmlXPathFreeObject(xpathObj);
if(xpathCtx)
xmlXPathFreeContext(xpathCtx);
if(fc->failed) {
if(photos_list)
flickcurl_free_photos_list(photos_list);
photos_list = NULL;
}
return photos_list;
}
flickcurl_photos_list*
flickcurl_invoke_photos_list(flickcurl* fc, const xmlChar* xpathExpr,
const char* format)
{
flickcurl_photos_list* photos_list=NULL;
xmlXPathContextPtr xpathCtx=NULL;
const char *nformat;
size_t format_len;
photos_list=(flickcurl_photos_list*)calloc(1, sizeof(flickcurl_photos_list));
if(!photos_list) {
fc->failed=1;
goto tidy;
}
if(format) {
nformat=format;
format_len=strlen(format);
photos_list->content=flickcurl_invoke_get_content(fc,
&photos_list->content_length);
if(!photos_list->content) {
fc->failed=1;
goto tidy;
}
} else {
xmlDocPtr doc=NULL;
nformat="xml";
format_len=3;
doc=flickcurl_invoke(fc);
if(!doc)
goto tidy;
xpathCtx = xmlXPathNewContext(doc);
if(!xpathCtx) {
flickcurl_error(fc, "Failed to create XPath context for document");
fc->failed=1;
goto tidy;
}
photos_list->photos=flickcurl_build_photos(fc, xpathCtx, xpathExpr,
&photos_list->photos_count);
if(!photos_list->photos) {
fc->failed=1;
goto tidy;
}
}
photos_list->format=(char*)malloc(format_len+1);
if(!photos_list->format) {
fc->failed=1;
goto tidy;
}
memcpy(photos_list->format, nformat, format_len+1);
tidy:
if(xpathCtx)
xmlXPathFreeContext(xpathCtx);
if(fc->failed) {
if(photos_list)
flickcurl_free_photos_list(photos_list);
photos_list=NULL;
}
return photos_list;
}
