SharpMuPDF/mupdf/source/fitz/xml-imp.h

// Copyright (C) 2022-2025 Artifex Software, Inc.
//
// This file is part of MuPDF.
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#ifndef XML_IMP_H

#define XML_IMP_H

#include "mupdf/fitz.h"

/* These types are required for basic XML operation. */

struct attribute
{
	char *value;
	struct attribute *next;
	char name[FZ_FLEXIBLE_ARRAY];
};

/**
	We use a slightly grotty representation for an XML tree.

	The topmost element of the tree is an fz_xml with up == NULL.
	This signifies that we are a 'doc', rather than a 'node'.

	We only ever get a 'doc' node at the root, and this contains
	a reference count for the entire tree, together with the
	fz_pool pointer used to allocate nodes.

	All other structures are 'nodes'. If down is MAGIC_TEXT then
	they are text nodes (with no children or attributes).
	Otherwise, they are standard XML nodes with attributes
	and children.
*/

struct fz_xml
{
	fz_xml *up, *down;
	union
	{
		struct /* up != NULL */
		{
			fz_xml *prev, *next;
#ifdef FZ_XML_SEQ
			int seq;
#endif
			union
			{
				char text[1]; /* down == MAGIC_TEXT */
				struct /* down != MAGIC_TEXT */
				{
					struct attribute *atts;
					char name[FZ_FLEXIBLE_ARRAY];
				} d;
			} u;
		} node;
		struct /* up == NULL */
		{
			int refs;
			fz_pool *pool;
		} doc;
	} u;
};

#define MAGIC_TEXT ((fz_xml *)1)

#define FZ_TEXT_ITEM(item) (item && item->down == MAGIC_TEXT)
#define FZ_DOCUMENT_ITEM(item) (item && item->up == NULL)

size_t xml_parse_entity(int *c, const char *a);

#endif