/* Copyright 2000-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ /** * @file apr_xml.h * @brief APR-UTIL XML Library */ #ifndef APR_XML_H #define APR_XML_H /** * @defgroup APR_Util_XML XML * @ingroup APR_Util * @{ */ #include "apr_pools.h" #include "apr_tables.h" #include "apr_file_io.h" #include "apu.h" #ifdef __cplusplus extern "C" { #endif /** * @package Apache XML library */ /* -------------------------------------------------------------------- */ /* ### these will need to move at some point to a more logical spot */ /** @see apr_text */ typedef struct apr_text apr_text; /** Structure to keep a linked list of pieces of text */ struct apr_text { /** The current piece of text */ const char *text; /** a pointer to the next piece of text */ struct apr_text *next; }; /** @see apr_text_header */ typedef struct apr_text_header apr_text_header; /** A list of pieces of text */ struct apr_text_header { /** The first piece of text in the list */ apr_text *first; /** The last piece of text in the list */ apr_text *last; }; /** * Append a piece of text to the end of a list * @param p The pool to allocate out of * @param hdr The text header to append to * @param text The new text to append */ APU_DECLARE(void) apr_text_append(apr_pool_t *p, apr_text_header *hdr, const char *text); /* -------------------------------------------------------------------- ** ** XML PARSING */ /* ** Qualified namespace values ** ** APR_XML_NS_DAV_ID ** We always insert the "DAV:" namespace URI at the head of the ** namespace array. This means that it will always be at ID==0, ** making it much easier to test for. ** ** APR_XML_NS_NONE ** This special ID is used for two situations: ** ** 1) The namespace prefix begins with "xml" (and we do not know ** what it means). Namespace prefixes with "xml" (any case) as ** their first three characters are reserved by the XML Namespaces ** specification for future use. mod_dav will pass these through ** unchanged. When this identifier is used, the prefix is LEFT in ** the element/attribute name. Downstream processing should not ** prepend another prefix. ** ** 2) The element/attribute does not have a namespace. ** ** a) No prefix was used, and a default namespace has not been ** defined. ** b) No prefix was used, and the default namespace was specified ** to mean "no namespace". This is done with a namespace ** declaration of: xmlns="" ** (this declaration is typically used to override a previous ** specification for the default namespace) ** ** In these cases, we need to record that the elem/attr has no ** namespace so that we will not attempt to prepend a prefix. ** All namespaces that are used will have a prefix assigned to ** them -- mod_dav will never set or use the default namespace ** when generating XML. This means that "no prefix" will always ** mean "no namespace". ** ** In both cases, the XML generation will avoid prepending a prefix. ** For the first case, this means the original prefix/name will be ** inserted into the output stream. For the latter case, it means ** the name will have no prefix, and since we never define a default ** namespace, this means it will have no namespace. ** ** Note: currently, mod_dav understands the "xmlns" prefix and the ** "xml:lang" attribute. These are handled specially (they aren't ** left within the XML tree), so the APR_XML_NS_NONE value won't ever ** really apply to these values. */ #define APR_XML_NS_DAV_ID 0 /**< namespace ID for "DAV:" */ #define APR_XML_NS_NONE -10 /**< no namespace for this elem/attr */ #define APR_XML_NS_ERROR_BASE -100 /**< used only during processing */ /** Is this namespace an error? */ #define APR_XML_NS_IS_ERROR(e) ((e) <= APR_XML_NS_ERROR_BASE) /** @see apr_xml_attr */ typedef struct apr_xml_attr apr_xml_attr; /** @see apr_xml_elem */ typedef struct apr_xml_elem apr_xml_elem; /** @see apr_xml_doc */ typedef struct apr_xml_doc apr_xml_doc; /** apr_xml_attr: holds a parsed XML attribute */ struct apr_xml_attr { /** attribute name */ const char *name; /** index into namespace array */ int ns; /** attribute value */ const char *value; /** next attribute */ struct apr_xml_attr *next; }; /** apr_xml_elem: holds a parsed XML element */ struct apr_xml_elem { /** element name */ const char *name; /** index into namespace array */ int ns; /** xml:lang for attrs/contents */ const char *lang; /** cdata right after start tag */ apr_text_header first_cdata; /** cdata after MY end tag */ apr_text_header following_cdata; /** parent element */ struct apr_xml_elem *parent; /** next (sibling) element */ struct apr_xml_elem *next; /** first child element */ struct apr_xml_elem *first_child; /** first attribute */ struct apr_xml_attr *attr; /* used only during parsing */ /** last child element */ struct apr_xml_elem *last_child; /** namespaces scoped by this elem */ struct apr_xml_ns_scope *ns_scope; /* used by modules during request processing */ /** Place for modules to store private data */ void *priv; }; /** Is this XML element empty? */ #define APR_XML_ELEM_IS_EMPTY(e) ((e)->first_child == NULL && \ (e)->first_cdata.first == NULL) /** apr_xml_doc: holds a parsed XML document */ struct apr_xml_doc { /** root element */ apr_xml_elem *root; /** array of namespaces used */ apr_array_header_t *namespaces; }; /** Opaque XML parser structure */ typedef struct apr_xml_parser apr_xml_parser; /** * Create an XML parser * @param pool The pool for allocating the parser and the parse results. * @return The new parser. */ APU_DECLARE(apr_xml_parser *) apr_xml_parser_create(apr_pool_t *pool); /** * Parse a File, producing a xml_doc * @param p The pool for allocating the parse results. * @param parser A pointer to *parser (needed so calling function can get * errors), will be set to NULL on successfull completion. * @param ppdoc A pointer to *apr_xml_doc (which has the parsed results in it) * @param xmlfd A file to read from. * @param buffer_length Buffer length which would be suitable * @return Any errors found during parsing. */ APU_DECLARE(apr_status_t) apr_xml_parse_file(apr_pool_t *p, apr_xml_parser **parser, apr_xml_doc **ppdoc, apr_file_t *xmlfd, apr_size_t buffer_length); /** * Feed input into the parser * @param parser The XML parser for parsing this data. * @param data The data to parse. * @param len The length of the data. * @return Any errors found during parsing. * @remark Use apr_xml_parser_geterror() to get more error information. */ APU_DECLARE(apr_status_t) apr_xml_parser_feed(apr_xml_parser *parser, const char *data, apr_size_t len); /** * Terminate the parsing and return the result * @param parser The XML parser for parsing this data. * @param pdoc The resulting parse information. May be NULL to simply * terminate the parsing without fetching the info. * @return Any errors found during the final stage of parsing. * @remark Use apr_xml_parser_geterror() to get more error information. */ APU_DECLARE(apr_status_t) apr_xml_parser_done(apr_xml_parser *parser, apr_xml_doc **pdoc); /** * Fetch additional error information from the parser. * @param parser The XML parser to query for errors. * @param errbuf A buffer for storing error text. * @param errbufsize The length of the error text buffer. * @return The error buffer */ APU_DECLARE(char *) apr_xml_parser_geterror(apr_xml_parser *parser, char *errbuf, apr_size_t errbufsize); /** * Converts an XML element tree to flat text * @param p The pool to allocate out of * @param elem The XML element to convert * @param style How to covert the XML. One of: * 
 *     APR_XML_X2T_FULL                start tag, contents, end tag 
 *     APR_XML_X2T_INNER               contents only 
 *     APR_XML_X2T_LANG_INNER          xml:lang + inner contents 
 *     APR_XML_X2T_FULL_NS_LANG        FULL + ns defns + xml:lang 
 *
* @param namespaces The namespace of the current XML element * @param ns_map Namespace mapping * @param pbuf Buffer to put the converted text into * @param psize Size of the converted text */ APU_DECLARE(void) apr_xml_to_text(apr_pool_t *p, const apr_xml_elem *elem, int style, apr_array_header_t *namespaces, int *ns_map, const char **pbuf, apr_size_t *psize); /* style argument values: */ #define APR_XML_X2T_FULL 0 /**< start tag, contents, end tag */ #define APR_XML_X2T_INNER 1 /**< contents only */ #define APR_XML_X2T_LANG_INNER 2 /**< xml:lang + inner contents */ #define APR_XML_X2T_FULL_NS_LANG 3 /**< FULL + ns defns + xml:lang */ /** * empty XML element * @param p The pool to allocate out of * @param elem The XML element to empty * @return the string that was stored in the XML element */ APU_DECLARE(const char *) apr_xml_empty_elem(apr_pool_t *p, const apr_xml_elem *elem); /** * quote an XML string * Replace '<', '>', and '&' with '<', '>', and '&'. * @param p The pool to allocate out of * @param s The string to quote * @param quotes If quotes is true, then replace '"' with '"'. * @return The quoted string * @note If the string does not contain special characters, it is not * duplicated into the pool and the original string is returned. */ APU_DECLARE(const char *) apr_xml_quote_string(apr_pool_t *p, const char *s, int quotes); /** * Quote an XML element * @param p The pool to allocate out of * @param elem The element to quote */ APU_DECLARE(void) apr_xml_quote_elem(apr_pool_t *p, apr_xml_elem *elem); /* manage an array of unique URIs: apr_xml_insert_uri() and APR_XML_URI_ITEM() */ /** * return the URI's (existing) index, or insert it and return a new index * @param uri_array array to insert into * @param uri The uri to insert * @return int The uri's index */ APU_DECLARE(int) apr_xml_insert_uri(apr_array_header_t *uri_array, const char *uri); /** Get the URI item for this XML element */ #define APR_XML_GET_URI_ITEM(ary, i) (((const char * const *)(ary)->elts)[i]) #ifdef __cplusplus } #endif /** @} */ #endif /* APR_XML_H */