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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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"
#if APR_CHARSET_EBCDIC
#include "apr_xlate.h"
#endif
#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 successful 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:
* <PRE>
* 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
* APR_XML_X2T_PARSED original prefixes
* </PRE>
* @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 */
#define APR_XML_X2T_PARSED 4 /**< original prefixes */
/**
* 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])
#if APR_CHARSET_EBCDIC
/**
* Convert parsed tree in EBCDIC
* @param p The pool to allocate out of
* @param pdoc The apr_xml_doc to convert.
* @param xlate The translation handle to use.
* @return Any errors found during conversion.
*/
APU_DECLARE(apr_status_t) apr_xml_parser_convert_doc(apr_pool_t *p,
apr_xml_doc *pdoc,
apr_xlate_t *convset);
#endif
#ifdef __cplusplus
}
#endif
/** @} */
#endif /* APR_XML_H */
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