/*

 * Summary: interface for the encoding conversion functions

 * Description: interface for the encoding conversion functions needed for

 *              XML basic encoding and iconv() support.

 *

 * Related specs are

 * rfc2044        (UTF-8 and UTF-16) F. Yergeau Alis Technologies

 * [ISO-10646]    UTF-8 and UTF-16 in Annexes

 * [ISO-8859-1]   ISO Latin-1 characters codes.

 * [UNICODE]      The Unicode Consortium, "The Unicode Standard --

 *                Worldwide Character Encoding -- Version 1.0", Addison-

 *                Wesley, Volume 1, 1991, Volume 2, 1992.  UTF-8 is

 *                described in Unicode Technical Report #4.

 * [US-ASCII]     Coded Character Set--7-bit American Standard Code for

 *                Information Interchange, ANSI X3.4-1986.

 *

 * Copy: See Copyright for the status of this software.

 *

 * Author: Daniel Veillard

 */

#ifndef __XML_CHAR_ENCODING_H__

#define __XML_CHAR_ENCODING_H__

//#include "Libxml2_xmlversion.h" // enable this when dependency on tree.h is removed 

#include "Libxml2_tree.h"

#ifdef LIBXML_ICONV_ENABLED

#include <iconv.h>

#endif

#ifdef __cplusplus

extern "C" {

#endif

/*

 * xmlCharEncoding:

 *

 * Predefined values for some standard encodings.

 * Libxml does not do beforehand translation on UTF8 and ISOLatinX.

 * It also supports ASCII, ISO-8859-1, and UTF16 (LE and BE) by default.

 *

 * Anything else would have to be translated to UTF8 before being

 * given to the parser itself. The BOM for UTF16 and the encoding

 * declaration are looked at and a converter is looked for at that

 * point. If not found the parser stops here as asked by the XML REC. A

 * converter can be registered by the user using xmlRegisterCharEncodingHandler

 * but the current form doesn't allow stateful transcoding (a serious

 * problem agreed !). If iconv has been found it will be used

 * automatically and allow stateful transcoding, the simplest is then

 * to be sure to enable iconv and to provide iconv libs for the encoding

 * support needed.

 *

 * Note that the generic "UTF-16" is not a predefined value.  Instead, only

 * the specific UTF-16LE and UTF-16BE are present.

 */

typedef enum {

    XML_CHAR_ENCODING_ERROR=   -1, /* No char encoding detected */

    XML_CHAR_ENCODING_NONE=	0, /* No char encoding detected */

    XML_CHAR_ENCODING_UTF8=	1, /* UTF-8 */

    XML_CHAR_ENCODING_UTF16LE=	2, /* UTF-16 little endian */

    XML_CHAR_ENCODING_UTF16BE=	3, /* UTF-16 big endian */

    XML_CHAR_ENCODING_UCS4LE=	4, /* UCS-4 little endian */

    XML_CHAR_ENCODING_UCS4BE=	5, /* UCS-4 big endian */

    XML_CHAR_ENCODING_EBCDIC=	6, /* EBCDIC uh! */

    XML_CHAR_ENCODING_UCS4_2143=7, /* UCS-4 unusual ordering */

    XML_CHAR_ENCODING_UCS4_3412=8, /* UCS-4 unusual ordering */

    XML_CHAR_ENCODING_UCS2=	9, /* UCS-2 */

    XML_CHAR_ENCODING_8859_1=	10,/* ISO-8859-1 ISO Latin 1 */

    XML_CHAR_ENCODING_8859_2=	11,/* ISO-8859-2 ISO Latin 2 */

    XML_CHAR_ENCODING_8859_3=	12,/* ISO-8859-3 */

    XML_CHAR_ENCODING_8859_4=	13,/* ISO-8859-4 */

    XML_CHAR_ENCODING_8859_5=	14,/* ISO-8859-5 */

    XML_CHAR_ENCODING_8859_6=	15,/* ISO-8859-6 */

    XML_CHAR_ENCODING_8859_7=	16,/* ISO-8859-7 */

    XML_CHAR_ENCODING_8859_8=	17,/* ISO-8859-8 */

    XML_CHAR_ENCODING_8859_9=	18,/* ISO-8859-9 */

    XML_CHAR_ENCODING_2022_JP=  19,/* ISO-2022-JP */

    XML_CHAR_ENCODING_SHIFT_JIS=20,/* Shift_JIS */

    XML_CHAR_ENCODING_EUC_JP=   21,/* EUC-JP */

    XML_CHAR_ENCODING_ASCII=    22 /* pure ASCII */

} xmlCharEncoding;

/**

 * xmlCharEncodingInputFunc:

 * @out:  a pointer to an array of bytes to store the UTF-8 result

 * @outlen:  the length of @out

 * @in:  a pointer to an array of chars in the original encoding

 * @inlen:  the length of @in

 *

 * Take a block of chars in the original encoding and try to convert

 * it to an UTF-8 block of chars out.

 *

 * Returns the number of bytes written, -1 if lack of space, or -2

 *     if the transcoding failed.

 * The value of @inlen after return is the number of octets consumed

 *     if the return value is positive, else unpredictiable.

 * The value of @outlen after return is the number of octets consumed.

 */

typedef int (* xmlCharEncodingInputFunc)(unsigned char *out, int *outlen,

                                         const unsigned char *in, int *inlen);

/**

 * xmlCharEncodingOutputFunc:

 * @out:  a pointer to an array of bytes to store the result

 * @outlen:  the length of @out

 * @in:  a pointer to an array of UTF-8 chars

 * @inlen:  the length of @in

 *

 * Take a block of UTF-8 chars in and try to convert it to another

 * encoding.

 * Note: a first call designed to produce heading info is called with

 * in = NULL. If stateful this should also initialize the encoder state.

 *

 * Returns the number of bytes written, -1 if lack of space, or -2

 *     if the transcoding failed.

 * The value of @inlen after return is the number of octets consumed

 *     if the return value is positive, else unpredictiable.

 * The value of @outlen after return is the number of octets produced.

 */

typedef int (* xmlCharEncodingOutputFunc)(unsigned char *out, int *outlen,

                                          const unsigned char *in, int *inlen);

/*

 * Block defining the handlers for non UTF-8 encodings.

 * If iconv is supported, there are two extra fields.

 */

typedef struct _xmlCharEncodingHandler xmlCharEncodingHandler;

typedef xmlCharEncodingHandler *xmlCharEncodingHandlerPtr;

struct _xmlCharEncodingHandler {

    char                       *name;

    xmlCharEncodingInputFunc   input;

    xmlCharEncodingOutputFunc  output;

#ifdef LIBXML_ICONV_ENABLED

    iconv_t                    iconv_in;

    iconv_t                    iconv_out;

#endif /* LIBXML_ICONV_ENABLED */

};

//#ifdef __cplusplus

//}

//#endif

//#ifdef __cplusplus

//extern "C" {

//#endif

/*

 * Interfaces for encoding handlers.

 */

XMLPUBFUN void XMLCALL	

	xmlInitCharEncodingHandlers	(void);

XMLPUBFUN void XMLCALL	

	xmlCleanupCharEncodingHandlers	(void);

XMLPUBFUN void XMLCALL	

	xmlRegisterCharEncodingHandler	(xmlCharEncodingHandlerPtr handler);

XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL

	xmlGetCharEncodingHandler	(xmlCharEncoding enc);

XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL

	xmlFindCharEncodingHandler	(const char *name);

XMLPUBFUN xmlCharEncodingHandlerPtr XMLCALL

	xmlNewCharEncodingHandler	(const char *name, 

                          		 xmlCharEncodingInputFunc input,

                          		 xmlCharEncodingOutputFunc output);

/*

 * Interfaces for encoding names and aliases.

 */

#ifndef XMLENGINE_EXCLUDE_UNUSED

XMLPUBFUN int XMLCALL xmlAddEncodingAlias(const char *name, const char *alias);

XMLPUBFUN int XMLCALL xmlDelEncodingAlias(const char *alias);

#endif

XMLPUBFUN const char * XMLCALL	xmlGetEncodingAlias			(const char *alias);

XMLPUBFUN void XMLCALL			xmlCleanupEncodingAliases	(void);

XMLPUBFUN xmlCharEncoding XMLCALL	xmlParseCharEncoding	(const char *name);

XMLPUBFUN const char * XMLCALL		xmlGetCharEncodingName	(xmlCharEncoding enc);

/*

 * Interfaces directly used by the parsers.

 */

XMLPUBFUN xmlCharEncoding XMLCALL

	xmlDetectCharEncoding		(const unsigned char *in,

					 int len);

// TODO: separate xmlBuffer definitions into standalone header file (and remove dependency on tree.h)

XMLPUBFUN int XMLCALL	

	xmlCharEncOutFunc		(xmlCharEncodingHandler *handler,

					 xmlBufferPtr out,

					 xmlBufferPtr in);

XMLPUBFUN int XMLCALL	

	xmlCharEncInFunc		(xmlCharEncodingHandler *handler,

					 xmlBufferPtr out,

					 xmlBufferPtr in);

XMLPUBFUN int XMLCALL

	xmlCharEncFirstLine		(xmlCharEncodingHandler *handler,

					 xmlBufferPtr out,

					 xmlBufferPtr in);

XMLPUBFUN int XMLCALL	

	xmlCharEncCloseFunc		(xmlCharEncodingHandler *handler);

/*

 * Export a few useful functions

 */

XMLPUBFUN int XMLCALL	

	UTF8Toisolat1			(unsigned char *out,

					 int *outlen,

					 const unsigned char *in,

					 int *inlen);

XMLPUBFUN int XMLCALL	

	isolat1ToUTF8			(unsigned char *out,

					 int *outlen,

					 const unsigned char *in,

					 int *inlen);

#ifdef __cplusplus

}

#endif

#endif /* __XML_CHAR_ENCODING_H__ */