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/*
	WARNING: This file was generated by dkct.
	Changes you make here will be lost if dkct is run again!
	You should modify the original source and run dkct on it.
	Original source: dk4utf8.ctr
*/

/*
Copyright (C) 2015-2017, Dirk Krause

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice,
  this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above opyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.
* Neither the name of the author nor the names of contributors may be used
  to endorse or promote products derived from this software without specific
  prior written permission.

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 OWNER 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.
*/

#ifndef DK4UTF8_H_INCLUDED
/** Avoid multiple inclusions. */
#define DK4UTF8_H_INCLUDED 1


#line 10 "dk4utf8.ctr"

/**	@file
	UTF-8 decoding and encoding.

To decode an UTF-8 encoded data stream, use a dk4_utf8_decoder_t object.
Use dk4utf8_init() to initialize the object before you start decoding.
For each byte from the data stream use dk4utf8_add(). Possible
return values are DK4_EDSTM_ACCEPT, DK4_EDSTM_FINISHED,
and DK4_EDSTM_ERROR.
DK4_EDSTM_ACCEPT indicates the byte was processed successfully,
but more bytes are required to complete the UNICODE character.
DK4_EDSTM_FINISHED indicates an UNICODE character was completed,
use dk4utf8_get() to retrieve it.
DK4_EDSTM_ERROR indicates an error, invalid input.

The older RFC2279 allows a wider range of UNICODE characters,
RFC3629 restricts the UNICODE character range to 0x0010FFFF.
Routines in this module use the range defined by RFC2279.
To be RFC3629 compliant, check UNICODE values and make sure
to use the range 0...0x0010FFFF only.

CRT on Windows: Not used.
*/


#ifndef DK4CONF_H_INCLUDED
#include "dk4conf.h"
#endif

#ifndef DK4TYPES_H_INCLUDED
#include "dk4types.h"
#endif

#ifndef DK4ERROR_H_INCLUDED
#include "dk4error.h"
#endif

#ifndef DK4DEC_H_INCLUDED
#include "dk4edstm.h"
#endif


/**	State machine to decode UTF-8 encoded data byte by byte.
*/
typedef struct {
  dk4_c32_t	uc;	/**< Unicode character to produce. */
  int		bfc;	/**< Bytes needed for character. */
  int		bfn;	/**< Bytes already found. */
} dk4_utf8_decoder_t;



#ifdef __cplusplus
extern "C" {
#endif

/**	Initialize the UTF-8 decoder.
	@param	ptr	Decoder to initialize.
*/
void
dk4utf8_init(dk4_utf8_decoder_t *ptr);

/**	Add one byte to the decoder.
	@param	ptr	Decoder to use.
	@param	byte	Byte to add.
	@return Operation result, one from:
	DK4_EDSTM_ACCEPT if the byte was added to the next output
	without completing output,
	DK4_EDSTM_FINISHED  if the byte was added to the next output
	completing the output, or
	DK4_EDSTM_ERROR on error.
*/
int
dk4utf8_add(dk4_utf8_decoder_t *ptr, unsigned char byte);

/**	Retrieve a completed Unicode character from the decoder.
	@param	ptr	Decoder to obtain character from.
*/
dk4_c32_t
dk4utf8_get(dk4_utf8_decoder_t *ptr);

/**	Check whether the decoder is empty.
	@param	ptr	Decoder to check.
	@return	1 on success, 0 on error.
*/
int
dk4utf8_is_empty(dk4_utf8_decoder_t *ptr);

/**	UTF-8 encode UNICODE character.
	@param	rb	Result buffer, at least 7 bytes.
	@param	pszrb	Size of result buffer, in: available, out: used.
	@param	c	Character to encode.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
	
	Error codes:
	- DK4_E_INVALID_ARGUMENTS<br>
	  if rb or pszrb is NULL,
	- DK4_E_BUFFER_TOO_SMALL<br>
	  if the size specified in pszrb is less than 7.
*/
int
dk4utf8_encode(unsigned char *rb, size_t *pszrb, dk4_c32_t c, dk4_er_t *erp);

#ifdef __cplusplus
}
#endif




#endif