sxmlc.h

/*
	Copyright (c) 2010, Matthieu Labas
	All rights reserved.

	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.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.

	The views and conclusions contained in the software and documentation are those of the
	authors and should not be interpreted as representing official policies, either expressed
	or implied, of the FreeBSD Project.
*/
#ifndef _SXML_H_
#define _SXML_H_

#define SXMLC_VERSION "4.2.5"

#ifdef __cplusplus
extern "C" {
#endif

#include <stdio.h>

#ifdef SXMLC_UNICODE
	typedef wchar_t SXML_CHAR;
	#define C2SX(c) L ## c
	#define CEOF WEOF
	#define sx_strcmp wcscmp
	#define sx_strncmp wcsncmp
	#define sx_strlen wcslen
	#define sx_strdup wcsdup
	#define sx_strchr wcschr
	#define sx_strrchr wcsrchr
	#define sx_strcpy wcscpy
	#define sx_strncpy wcsncpy
	#define sx_strcat wcscat
	#define sx_printf wprintf
	#define sx_fprintf fwprintf
	#define sx_sprintf swprintf
	#define sx_fgetc fgetwc
	#define sx_fputc fputwc
	#define sx_isspace iswspace
	#if defined(WIN32) || defined(WIN64)
		#define sx_fopen _wfopen
	#else
		#define sx_fopen fopen
	#endif
	#define sx_fclose fclose
#else
	typedef char SXML_CHAR;
	#define C2SX(c) c
	#define CEOF EOF
	#define sx_strcmp strcmp
	#define sx_strncmp strncmp
	#define sx_strlen strlen
	#define sx_strdup __sx_strdup
	#define sx_strchr strchr
	#define sx_strrchr strrchr
	#define sx_strcpy strcpy
	#define sx_strncpy strncpy
	#define sx_strcat strcat
	#define sx_printf printf
	#define sx_fprintf fprintf
	#define sx_sprintf sprintf
	#define sx_fgetc fgetc
	#define sx_fputc fputc
	#define sx_isspace(ch) isspace((int)ch)
	#define sx_fopen fopen
	#define sx_fclose fclose
#endif

#ifdef DBG_MEM
	void* __malloc(size_t sz);
	void* __calloc(size_t count, size_t sz);
	void* __realloc(void* mem, size_t sz);
	void __free(void* mem);
	char* __sx_strdup(const char* s);
#else
	#define __malloc malloc
	#define __calloc calloc
	#define __realloc realloc
	#define __free free
	#define __sx_strdup strdup
#endif

#ifndef MEM_INCR_RLA
#define MEM_INCR_RLA (256*sizeof(SXML_CHAR)) /* Initial buffer size and increment for memory reallocations */
#endif

#ifndef false
#define false 0
#endif

#ifndef true
#define true 1
#endif

#define NULC ((SXML_CHAR)C2SX('\0'))
#define isquote(c) (((c) == C2SX('"')) || ((c) == C2SX('\'')))

/*
 Buffer data source used by 'read_line_alloc' when required.
 'buf' should be 0-terminated.
 */
typedef struct _DataSourceBuffer {
	const SXML_CHAR* buf;
	int cur_pos;
} DataSourceBuffer;

typedef FILE* DataSourceFile;

typedef enum _DataSourceType {
	DATA_SOURCE_FILE = 0,
	DATA_SOURCE_BUFFER,
	DATA_SOURCE_MAX
} DataSourceType;

#ifndef false
#define false 0
#endif

#ifndef true
#define true 1
#endif

/* Node types */
typedef enum _TagType {
	TAG_ERROR = -1,
	TAG_NONE = 0,
	TAG_PARTIAL,	/* Node containing a legal '>' that stopped file reading */
	TAG_FATHER,		/* <tag> - Next nodes will be children of this one. */
	TAG_SELF,		/* <tag/> - Standalone node. */
	TAG_INSTR,		/* <?prolog?> - Processing instructions, or prolog node. */
	TAG_COMMENT,	/* <!--comment--> */
	TAG_CDATA,		/* <![CDATA[ ]]> - CDATA node */
	TAG_DOCTYPE,	/* <!DOCTYPE [ ]> - DOCTYPE node */
	TAG_END,		/* </tag> - End of father node. */
	TAG_TEXT,		/* text node*/

	TAG_USER = 100	/* User-defined tag start */
} TagType;

/* TODO: Performance improvement with some fixed-sized strings ??? (e.g. XMLAttribute.name[64], XMLNode.tag[64]) */

typedef struct _XMLAttribute {
	SXML_CHAR* name;
	SXML_CHAR* value;
	int active;
} XMLAttribute;

/* Constant to know whether a struct has been initialized (XMLNode or XMLDoc) */
#define XML_INIT_DONE 0x19770522 /* Happy Birthday ;) */

/*
 An XML node.
 */
typedef struct _XMLNode {
	SXML_CHAR* tag;				/* Tag name */
	SXML_CHAR* text;			/* Text inside the node */
	XMLAttribute* attributes;
	int n_attributes;
	
	struct _XMLNode* father;	/* NULL if root */
	struct _XMLNode** children;
	int n_children;
	
	TagType tag_type;	/* Node type ('TAG_FATHER', 'TAG_SELF' or 'TAG_END') */
	int active;		/* 'true' to tell that node is active and should be displayed by 'XMLDoc_print' */

	void* user;	/* Pointer for user data associated to the node */

	/* Keep 'init_value' as the last member */
	int init_value;	/* Initialized to 'XML_INIT_DONE' to indicate that node has been initialized properly */
} XMLNode;

/*
 An XML document.
 */
#ifndef SXMLC_MAX_PATH
#define SXMLC_MAX_PATH 256
#endif
typedef struct _XMLDoc {
	SXML_CHAR filename[SXMLC_MAX_PATH];
#ifdef SXMLC_UNICODE
	BOM_TYPE bom_type;
	unsigned char bom[5];	/* First characters read that might be a BOM when unicode is used */
	int sz_bom;				/* Number of bytes in BOM */
#endif
	XMLNode** nodes;		/* Nodes of the document, including prolog, comments and root nodes */
	int n_nodes;			/* Number of nodes in 'nodes' */
	int i_root;				/* Index of first root node in 'nodes', -1 if document is empty */

	/* Keep 'init_value' as the last member */
	int init_value;	/* Initialized to 'XML_INIT_DONE' to indicate that document has been initialized properly */
} XMLDoc;

/*
 Register an XML tag, giving its 'start' and 'end' string, which should include '<' and '>'.
 The 'tag_type' is user-given and has to be less than or equal to 'TAG_USER'. It will be
 returned as the 'tag_type' member of the XMLNode struct. Note that no test is performed
 to check for an already-existing tag_type.
 Return tag index in user tags table when successful, or '-1' if the 'tag_type' is invalid or
 the new tag could not be registered (e.g. when 'start' does not start with '<' or 'end' does not end with '>').
 */
int XML_register_user_tag(TagType tag_type, SXML_CHAR* start, SXML_CHAR* end);

/*
 Remove a registered user tag.
 Return the new number of registered user tags or '-1' if 'i_tag' is invalid.
 */
int XML_unregister_user_tag(int i_tag);

/*
 Return the number of registered tags.
 */
int XML_get_nb_registered_user_tags(void);

/*
 Return the index of first occurrence of 'tag_type' in registered user tags, or '-1' if not found.
 */
int XML_get_registered_user_tag(TagType tag_type);


typedef enum _ParseError {
	PARSE_ERR_NONE = 0,
	PARSE_ERR_MEMORY = -1,
	PARSE_ERR_UNEXPECTED_TAG_END = -2,
	PARSE_ERR_SYNTAX = -3,
	PARSE_ERR_EOF = -4,
	PARSE_ERR_TEXT_OUTSIDE_NODE = -5, /* During DOM loading */
	PARSE_ERR_UNEXPECTED_NODE_END = -6 /* During DOM loading */
} ParseError;

/*
 Events that can happen when loading an XML document.
 These will be passed to the 'all_event' callback of the SAX parser.
 */
typedef enum _XMLEvent {
	XML_EVENT_START_DOC,
	XML_EVENT_START_NODE,
	XML_EVENT_END_NODE,
	XML_EVENT_TEXT,
	XML_EVENT_ERROR,
	XML_EVENT_END_DOC
} XMLEvent;

/*
 Structure given as an argument for SAX callbacks to retrieve information about
 parsing status
 */
typedef struct _SAX_Data {
	const SXML_CHAR* name;
	int line_num;
	void* user;
} SAX_Data;

/*
 User callbacks used for SAX parsing. Return values of these callbacks should be 0 to stop parsing.
 Members can be set to NULL to disable handling of some events.
 All parameters are pointers to structures that will no longer be available after callback returns.
 It is recommended that the callback uses the information and stores it in its own data structure.
 WARNING! SAX PARSING DOES NOT CHECK FOR XML INTEGRITY! e.g. a tag end without a matching tag start
 will not be detected by the parser and should be detected by the callbacks instead.
 */
typedef struct _SAX_Callbacks {
	/*
	 Callback called when parsing starts, before parsing the first node.
	 */
	int (*start_doc)(SAX_Data* sd);

	/*
	 Callback called when a new node starts (e.g. '<tag>' or '<tag/>').
	 If any, attributes can be read from 'node->attributes'.
	 N.B. '<tag/>' will trigger an immediate call to the 'end_node' callback
	 after the 'start_node' callback.
	 */
	int (*start_node)(const XMLNode* node, SAX_Data* sd);

	/*
	 Callback called when a node ends (e.g. '</tag>' or '<tag/>').
	 */
	int (*end_node)(const XMLNode* node, SAX_Data* sd);

	/*
	 Callback called when text has been found in the last node.
	 */
	int (*new_text)(SXML_CHAR* text, SAX_Data* sd);

	/*
	 Callback called when parsing is finished.
	 No other callbacks will be called after it.
	 */
	int (*end_doc)(SAX_Data* sd);

	/*
	 Callback called when an error occurs during parsing.
	 'error_num' is the error number and 'line_number' is the line number in the stream
	 being read (file or buffer).
	 */
	int (*on_error)(ParseError error_num, int line_number, SAX_Data* sd);

	/*
	 Callback called when text has been found in the last node.
	 'event' is the type of event for which the callback was called:
	 	 XML_EVENT_START_DOC:
	 	 	 'node' is NULL.
	 	 	 'text' is the file name if a file is being parsed, NULL if a buffer is being parsed.
	 	 	 'n' is 0.
	 	 XML_EVENT_START_NODE:
	 	 	 'node' is the node starting, with tag and all attributes initialized.
	 	 	 'text' is NULL.
	 	 	 'n' is the number of lines parsed.
	 	 XML_EVENT_END_NODE:
	 	 	 'node' is the node ending, with tag, attributes and text initialized.
	 	 	 'text' is NULL.
	 	 	 'n' is the number of lines parsed.
	 	 XML_EVENT_TEXT:
	 	 	 'node' is NULL.
	 	 	 'text' is the text to be added to last node started and not finished.
	 	 	 'n' is the number of lines parsed.
	 	 XML_EVENT_ERROR:
	 	 	 Everything is NULL.
	 	 	 'n' is one of the 'PARSE_ERR_*'.
	 	 XML_EVENT_END_DOC:
	 	 	 'node' is NULL.
	 	 	 'text' is the file name if a file is being parsed, NULL if a buffer is being parsed.
	 	 	 'n' is the number of lines parsed.
	 */
	int (*all_event)(XMLEvent event, const XMLNode* node, SXML_CHAR* text, const int n, SAX_Data* sd);
} SAX_Callbacks;

/*
 Helper function to initialize all 'sax' members to NULL.
 Return 'false' is 'sax' is NULL.
 */
int SAX_Callbacks_init(SAX_Callbacks* sax);

/*
 Set of SAX callbacks used by 'XMLDoc_parse_file_DOM'.
 These are made available to be able to load an XML document using DOM implementation
 with user-defined code at some point (e.g. counting nodes, running search, ...).
 In this case, the 'XMLDoc_parse_file_SAX' has to be called instead of the 'XMLDoc_parse_file_DOM',
 providing either these callbacks directly, or a functions calling these callbacks.
 To do that, you should initialize the 'doc' member of the 'DOM_through_SAX' struct and call the
 'XMLDoc_parse_file_SAX' giving this struct as a the 'user' data pointer.
 */

typedef struct _DOM_through_SAX {
	XMLDoc* doc;		/* Document to fill up */
	XMLNode* current;	/* For internal use (current father node) */
	ParseError error;	/* For internal use (parse status) */
	int line_error;		/* For internal use (line number when error occurred) */
	int text_as_nodes;	/* For internal use (store text inside nodes as sequential TAG_TEXT nodes) */
} DOM_through_SAX;

int DOMXMLDoc_doc_start(SAX_Data* dom);
int DOMXMLDoc_node_start(const XMLNode* node, SAX_Data* dom);
int DOMXMLDoc_node_text(SXML_CHAR* text, SAX_Data* dom);
int DOMXMLDoc_node_end(const XMLNode* node, SAX_Data* dom);
int DOMXMLDoc_parse_error(ParseError error_num, int line_number, SAX_Data* sd);
int DOMXMLDoc_doc_end(SAX_Data* dom);

/*
 Initialize 'sax' with the "official" DOM callbacks.
 */
int SAX_Callbacks_init_DOM(SAX_Callbacks* sax);

/* --- XMLNode methods --- */

/*
 Fills 'xmlattr' with 'xmlattr->name' to 'attrName' and 'xmlattr->value' to 'attr Value'.
 'str' is supposed to be like 'attrName[ ]=[ ]["]attr Value["]'.
 Return 0 if not enough memory or bad parameters (NULL 'str' or 'xmlattr').
        2 if last quote is missing in the attribute value.
        1 if 'xmlattr' was filled correctly.
 */
int XML_parse_attribute_to(const SXML_CHAR* str, int to, XMLAttribute* xmlattr);

#define XML_parse_attribute(str, xmlattr) XML_parse_attribute_to(str, -1, xmlattr)

/*
 Reads a string that is supposed to be an xml tag like '<tag (attribName="attribValue")* [/]>' or '</tag>'.
 Fills the 'xmlnode' structure with the tag name and its attributes.
 Returns 0 if an error occurred (malformed 'str' or memory). 'TAG_*' when string is recognized.
 */
TagType XML_parse_1string(const SXML_CHAR* str, XMLNode* xmlnode);

/*
 Allocate and initialize XML nodes.
 'n' is the number of contiguous elements to allocate (to create and array).
 Return 'NULL' if not enough memory, or the pointer to the elements otherwise.
 */
XMLNode* XMLNode_allocN(int n);

/*
 Shortcut to allocate one node only.
 */
#define XMLNode_alloc() XMLNode_allocN(1)

/*
 Initialize an already-allocated XMLNode.
 */
int XMLNode_init(XMLNode* node);

/*
 Free a node and all its children.
 */
int XMLNode_free(XMLNode* node);

/*
 Free XMLNode 'dst' and copy 'src' to 'dst', along with its children if specified.
 If 'src' is NULL, 'dst' is freed and initialized.
 */
int XMLNode_copy(XMLNode* dst, const XMLNode* src, int copy_children);

/*
 Allocate a node and copy 'node' into it.
 If 'copy_children' is 'true', all children of 'node' will be copied to the new node.
 Return 'NULL' if not enough memory, or a pointer to the new node otherwise.
 */
XMLNode* XMLNode_dup(const XMLNode* node, int copy_children);

/*
 Set the active/inactive state of 'node'.
 Set 'active' to 'true' to activate 'node' and all its children, and enable its use
 in other functions (e.g. 'XMLDoc_print', 'XMLNode_search_child').
 */
int XMLNode_set_active(XMLNode* node, int active);

/*
 Set 'node' tag.
 Return 'false' for memory error, 'true' otherwise.
 */
int XMLNode_set_tag(XMLNode* node, const SXML_CHAR* tag);

/*
 Set the node type among one of the valid ones (TAG_FATHER, TAG_SELF, TAG_INSTR,
 TAG_COMMENT, TAG_CDATA, TAG_DOCTYPE) or any user-registered tag.
 Return 'false' when the node or the 'tag_type' is invalid.
 */
int XMLNode_set_type(XMLNode* node, const TagType tag_type);

/*
 Add an attribute to 'node' or update an existing one.
 The attribute has a 'name' and a 'value'.
 Return the new number of attributes, or -1 for memory problem.
 */
int XMLNode_set_attribute(XMLNode* node, const SXML_CHAR* attr_name, const SXML_CHAR* attr_value);

/*
 Retrieve an attribute value, based on its name, allocating 'attr_value'.
 If the attribute name does not exist, set 'attr_value' to the given default value.
 Return 'false' when the node is invalid, 'attr_name' is NULL or empty, or 'attr_value' is NULL.
 */
int XMLNode_get_attribute_with_default(XMLNode* node, const SXML_CHAR* attr_name, const SXML_CHAR** attr_value, const SXML_CHAR* default_attr_value);

/*
 Helper macro that retrieve an attribute value, or an empty string if the attribute does
 not exist.
 */
#define XMLNode_get_attribute(node, attr_name, attr_value) XMLNode_get_attribute_with_default(node, attr_name, attr_value, C2SX(""))

/*
 Return the number of active attributes of 'node', or '-1' if 'node' is invalid.
*/
int XMLNode_get_attribute_count(const XMLNode* node);

/*
 Search for the active attribute 'attr_name' in 'node', starting from index 'isearch'
 and returns its index, or -1 if not found or error.
 */
int XMLNode_search_attribute(const XMLNode* node, const SXML_CHAR* attr_name, int isearch);

/*
 Remove attribute index 'i_attr'.
 Return the new number of attributes or -1 on invalid arguments.
 */
int XMLNode_remove_attribute(XMLNode* node, int i_attr);

/*
 Remove all attributes from 'node'.
 */
int XMLNode_remove_all_attributes(XMLNode* node);

/*
 Set node text.
 Return 'true' when successful, 'false' on error.
 */
int XMLNode_set_text(XMLNode* node, const SXML_CHAR* text);

/*
 Helper macro to remove text from 'node'.
 */
#define XMLNode_remove_text(node) XMLNode_set_text(node, NULL);

/*
 Add a child to a node.
 Return 'false' for memory problem, 'true' otherwise.
 */
int XMLNode_add_child(XMLNode* node, XMLNode* child);

/*
 Return the number of active children nodes of 'node', or '-1' if 'node' is invalid.
 */
int XMLNode_get_children_count(const XMLNode* node);

/*
 Return a reference to the 'i_child'th active node.
 */
XMLNode* XMLNode_get_child(const XMLNode* node, int i_child);

/*
 Remove the 'i_child'th active child of 'node'.
 If 'free_child' is 'true', free the child node itself. This parameter is usually 'true'
 but should be 'false' when child nodes are pointers to local or global variables instead of
 user-allocated memory.
 Return the new number of children or -1 on invalid arguments.
 */
int XMLNode_remove_child(XMLNode* node, int i_child, int free_child);

/*
 Remove all children from 'node'.
 */
int XMLNode_remove_children(XMLNode* node);

/*
 Return 'true' if 'node1' is the same as 'node2' (i.e. same tag, same active attributes).
 */
int XMLNode_equal(const XMLNode* node1, const XMLNode* node2);

/*
 Return the next sibling of node 'node', or NULL if 'node' is invalid or the last child
 or if its father could not be determined (i.e. 'node' is a root node).
 */
XMLNode* XMLNode_next_sibling(const XMLNode* node);

/*
 Return the next node in XML order i.e. first child or next sibling, or NULL
 if 'node' is invalid or the end of its root node is reached.
 */
XMLNode* XMLNode_next(const XMLNode* node);


/* --- XMLDoc methods --- */


/*
 Initializes an already-allocated XML document.
 */
int XMLDoc_init(XMLDoc* doc);

/*
 Free an XML document.
 Return 'false' if 'doc' was not initialized.
 */
int XMLDoc_free(XMLDoc* doc);

/*
 Set the new 'doc' root node among all existing nodes in 'doc'.
 Return 'false' if bad arguments, 'true' otherwise.
 */
int XMLDoc_set_root(XMLDoc* doc, int i_root);

/*
 Add a node to the document, specifying the type.
 If its type is TAG_FATHER, it also sets the document root node if previously undefined.
 Return the node index, or -1 if bad arguments or memory error.
 */
int XMLDoc_add_node(XMLDoc* doc, XMLNode* node);

/*
 Remove a node from 'doc' root nodes, base on its index.
 If 'free_node' is 'true', free the node itself. This parameter is usually 'true'
 but should be 'false' when the node is a pointer to local or global variable instead of
 user-allocated memory.
 Return 'true' if node was removed or 'false' if 'doc' or 'i_node' is invalid.
 */
int XMLDoc_remove_node(XMLDoc* doc, int i_node, int free_node);

/*
 Shortcut macro to retrieve root node from a document.
 Equivalent to
 doc->nodes[doc->i_root]
 */
#define XMLDoc_root(doc) ((doc)->nodes[(doc)->i_root])

/*
 Shortcut macro to add a node to 'doc' root node.
 Equivalent to
 XMLDoc_add_child_root(XMLDoc* doc, XMLNode* child);
 */
#define XMLDoc_add_child_root(doc, child) XMLNode_add_child((doc)->nodes[(doc)->i_root], (child))

/*
 Default quote to use to print attribute value.
 User can redefine it with its own character by adding a #define XML_DEFAULT_QUOTE before including
 this file.
 */
#ifndef XML_DEFAULT_QUOTE
#define XML_DEFAULT_QUOTE C2SX('"')
#endif

/*
 Print the node and its children to a file (that can be stdout).
 - 'tag_sep' is the string to use to separate nodes from each other (usually "\n").
 - 'child_sep' is the additional string to put for each child level (usually "\t").
 - 'keep_text_spaces' indicates that text should not be printed if it is composed of
   spaces, tabs or new lines only (e.g. when XML document spans on several lines due to
   pretty-printing).
 - 'sz_line' is the maximum number of characters that can be put on a single line. The
   node remainder will be output to extra lines.
 - 'nb_char_tab' is how many characters should be counted for a tab when counting characters
   in the line. It usually is 8 or 4, but at least 1.
 - 'depth' is an internal parameter that is used to determine recursively how deep we are in
   the tree. It should be initialized to 0 at first call.
 Return 'false' on invalid arguments (NULL 'node' or 'f'), 'true' otherwise.
 */
int XMLNode_print_attr_sep(const XMLNode* node, FILE* f, const SXML_CHAR* tag_sep, const SXML_CHAR* child_sep, const SXML_CHAR* attr_sep, int keep_text_spaces, int sz_line, int nb_char_tab);

/* For backward compatibility */
#define XMLNode_print(node, f, tag_sep, child_sep, keep_text_spaces, sz_line, nb_char_tab) XMLNode_print_attr_sep(node, f, tag_sep, child_sep, C2SX(" "), keep_text_spaces, sz_line, nb_char_tab)

/*
 Print the node "header": <tagname attribname="attibval" ...[/]>, spanning it on several lines if needed.
 Return 'false' on invalid arguments (NULL 'node' or 'f'), 'true' otherwise.
 */
int XMLNode_print_header(const XMLNode* node, FILE* f, int sz_line, int nb_char_tab);

/*
 Prints the XML document using 'XMLNode_print' on all document root nodes.
 */
int XMLDoc_print_attr_sep(const XMLDoc* doc, FILE* f, const SXML_CHAR* tag_sep, const SXML_CHAR* child_sep, const SXML_CHAR* attr_sep, int keep_text_spaces, int sz_line, int nb_char_tab);

/* For backward compatibility */
#define XMLDoc_print(doc, f, tag_sep, child_sep, keep_text_spaces, sz_line, nb_char_tab) XMLDoc_print_attr_sep(doc, f, tag_sep, child_sep, C2SX(" "), keep_text_spaces, sz_line, nb_char_tab)

/*
 Create a new XML document from a given 'filename' and load it to 'doc'.
 'text_as_nodes' should be non-zero to put text into separate TAG_TEXT nodes.
 Return 'false' in case of error (memory or unavailable filename, malformed document), 'true' otherwise.
 */
int XMLDoc_parse_file_DOM_text_as_nodes(const SXML_CHAR* filename, XMLDoc* doc, int text_as_nodes);

/* For backward compatibility */
#define XMLDoc_parse_file_DOM(filename, doc) XMLDoc_parse_file_DOM_text_as_nodes(filename, doc, 0)

/*
 Create a new XML document from a memory buffer 'buffer' that can be given a name 'name', and load
 it into 'doc'.
 'text_as_nodes' should be non-zero to put text into separate TAG_TEXT nodes.
 Return 'false' in case of error (memory or unavailable filename, malformed document), 'true' otherwise.
 */
int XMLDoc_parse_buffer_DOM_text_as_nodes(const SXML_CHAR* buffer, const SXML_CHAR* name, XMLDoc* doc, int text_as_nodes);

/* For backward compatibility */
#define XMLDoc_parse_buffer_DOM(buffer, name, doc) XMLDoc_parse_buffer_DOM_text_as_nodes(buffer, name, doc, 0)

/*
 Parse an XML document from a given 'filename', calling SAX callbacks given in the 'sax' structure.
 'user' is a user-given pointer that will be given back to all callbacks.
 Return 'false' in case of error (memory or unavailable filename, malformed document), 'true' otherwise.
 */
int XMLDoc_parse_file_SAX(const SXML_CHAR* filename, const SAX_Callbacks* sax, void* user);

/*
 Parse an XML document from a memory buffer 'buffer' that can be given a name 'name',
 calling SAX callbacks given in the 'sax' structure.
 'user' is a user-given pointer that will be given back to all callbacks.
 Return 'false' in case of error (memory or unavailable filename, malformed document), 'true' otherwise.
 */
int XMLDoc_parse_buffer_SAX(const SXML_CHAR* buffer, const SXML_CHAR* name, const SAX_Callbacks* sax, void* user);

/*
 Parse an XML file using the DOM implementation.
 */
#define XMLDoc_parse_file XMLDOC_parse_file_DOM



/* --- Utility functions --- */

/*
 Functions to get next byte from buffer data source and know if the end has been reached.
 Return as 'fgetc' and 'feof' would for 'FILE*'.
 */
int _bgetc(DataSourceBuffer* ds);
int _beob(DataSourceBuffer* ds);
/*
 Reads a line from data source 'in', eventually (re-)allocating a given buffer 'line'.
 Characters read will be stored in 'line' starting at 'i0' (this allows multiple calls to
 'read_line_alloc' on the same 'line' buffer without overwriting it at each call).
 'in_type' specifies the type of data source to be read: 'in' is 'FILE*' if 'in_type'
 'sz_line' is the size of the buffer 'line' if previously allocated. 'line' can point
 to NULL, in which case it will be allocated '*sz_line' bytes. After the function returns,
 '*sz_line' is the actual buffer size. This allows multiple calls to this function using the
 same buffer (without re-allocating/freeing).
 If 'sz_line' is non NULL and non 0, it means that '*line' is a VALID pointer to a location
 of '*sz_line' SXML_CHAR (not bytes! Multiply by sizeof(SXML_CHAR) to get number of bytes).
 Searches for character 'from' until character 'to'. If 'from' is 0, starts from
 current position. If 'to' is 0, it is replaced by '\n'.
 If 'keep_fromto' is 0, removes characters 'from' and 'to' from the line.
 If 'interest_count' is not NULL, will receive the count of 'interest' characters while searching
 for 'to' (e.g. use 'interest'='\n' to count lines in file).
 Returns the number of characters in the line or 0 if an error occurred.
 'read_line_alloc' uses constant 'MEM_INCR_RLA' to reallocate memory when needed. It is possible
 to override this definition to use another value.
 */
int read_line_alloc(void* in, DataSourceType in_type, SXML_CHAR** line, int* sz_line, int i0, SXML_CHAR from, SXML_CHAR to, int keep_fromto, SXML_CHAR interest, int* interest_count);

/*
 Concatenates the string pointed at by 'src1' with 'src2' into '*src1' and
 return it ('*src1').
 Return NULL when out of memory.
 */
SXML_CHAR* strcat_alloc(SXML_CHAR** src1, const SXML_CHAR* src2);

/*
 Strip spaces at the beginning and end of 'str', modifying 'str'.
 If 'repl_sq' is not '\0', squeezes spaces to an single character ('repl_sq').
 If not '\0', 'protect' is used to protect spaces from being deleted (usually a backslash).
 Returns the string or NULL if 'protect' is a space (which would not make sense).
 */
SXML_CHAR* strip_spaces(SXML_CHAR* str, SXML_CHAR repl_sq);

/*
 Remove '\' characters from 'str', modifying it.
 Return 'str'.
 */
SXML_CHAR* str_unescape(SXML_CHAR* str);

/*
 Split 'str' into a left and right part around a separator 'sep'.
 The left part is located between indexes 'l0' and 'l1' while the right part is
 between 'r0' and 'r1' and the separator position is at 'i_sep' (whenever these are
 not NULL).
 If 'ignore_spaces' is 'true', computed indexes will not take into account potential
 spaces around the separator as well as before left part and after right part.
 if 'ignore_quotes' is 'true', " or ' will not be taken into account when parsing left
 and right members.
 Whenever the right member is empty (e.g. "attrib" or "attrib="), '*r0' is initialized
 to 'str' size and '*r1' to '*r0-1' (crossed).
 If the separator was not found (i.e. left member only), '*i_sep' is '-1'.
 Return 'false' when 'str' is malformed, 'true' when splitting was successful.
 */
int split_left_right(SXML_CHAR* str, SXML_CHAR sep, int* l0, int* l1, int* i_sep, int* r0, int* r1, int ignore_spaces, int ignore_quotes);

typedef enum _BOM_TYPE {
	BOM_NONE = 0x00,
	BOM_UTF_8 = 0xefbbbf,
	BOM_UTF_16BE = 0xfeff,
	BOM_UTF_16LE = 0xfffe,
	BOM_UTF_32BE = 0x0000feff,
	BOM_UTF_32LE = 0xfffe0000
} BOM_TYPE;
/*
 Detect a potential BOM at the current file position and read it into 'bom' (if not NULL,
 'bom' should be at least 5 bytes). It also moves the 'f' beyond the BOM so it's possible to
 skip it by calling 'freadBOM(f, NULL, NULL)'. If no BOM is found, it leaves 'f' file pointer
 is reset to its original location.
 If not null, 'sz_bom' is filled with how many bytes are stored in 'bom'.
 Return the BOM type or BOM_NONE if none found (empty 'bom' in this case).
 */
BOM_TYPE freadBOM(FILE* f, unsigned char* bom, int* sz_bom);

/*
 Replace occurrences of special HTML characters escape sequences (e.g. '&amp;') found in 'html'
 by its character equivalent (e.g. '&') into 'str'.
 If 'html' and 'str' are the same pointer replacement is made in 'str' itself, overwriting it.
 If 'str' is NULL, replacement is made into 'html', overwriting it.
 Returns 'str' (or 'html' if 'str' was NULL).
 */
SXML_CHAR* html2str(SXML_CHAR* html, SXML_CHAR* str);

/*
 Replace occurrences of special characters (e.g. '&') found in 'str' into their XML escaped
 equivalent (e.g. '&amp;') into 'xml'.
 'xml' is supposed allocated to the correct size (e.g. using 'malloc(strlen_html(str)+30)') and
 different from 'str' (unlike 'html2str'), as string will expand. If it is NULL, 'str' will be
 analyzed and a string will be allocated to the exact size, before being returned. In that case,
 it is the responsibility of the caller to free() the result!
 Return 'xml' or NULL if 'str' or 'xml' are NULL, or when 'xml' is 'str'.
*/
SXML_CHAR* str2html(SXML_CHAR* str, SXML_CHAR* xml);

/*
 Return the length of 'str' as if all its special character were replaced by their HTML
 equivalent.
 Return 0 if 'str' is NULL.
 */
int strlen_html(SXML_CHAR* str);

/*
 Print 'str' to 'f', transforming special characters into their HTML equivalent.
 Returns the number of output characters.
 */
int fprintHTML(FILE* f, SXML_CHAR* str);

/*
 Checks whether 'str' corresponds to 'pattern'.
 'pattern' can use wildcads such as '*' (any potentially empty string) or
 '?' (any character) and use '\' as an escape character.
 Returns 'true' when 'str' matches 'pattern', 'false' otherwise.
 */
int regstrcmp(SXML_CHAR* str, SXML_CHAR* pattern);

#ifdef __cplusplus
}
#endif

#endif