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path: root/support/dktools/dk4tsp16.ctr
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%%	options

copyright owner	=	Dirk Krause
copyright year	=	2015-xxxx
license		=	bsd


%%	header

/**	@file
	Text stream processing for 16 bit characters.

	CRT on Windows: Optional.
*/

#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 DK4BOM_H_INCLUDED
#include "dk4bom.h"
#endif

#ifndef DK4TSP_H_INCLUDED
#include "dk4tsp.h"
#endif

#ifndef DK4UTF8_H_INCLUDED
#include "dk4utf8.h"
#endif

#ifndef DK4UTF16_H_INCLUDED
#include "dk4utf16.h"
#endif

#ifndef DK4C32_H_INCLUDED
#include "dk4c32.h"
#endif

/**	Handler function for single characters.
	@param	obj	Object to modify while processing the character.
	@param	c	Character to process.
	@param	pos	Current position in file or data stream.
	@param	erp	Error report, may be NULL.
	@return	DK4_TSP_RES_OK		if the character was processed
					successfully,
		DK4_TSP_RES_ERROR	if there was an error but we can
					continue,
		DK4_TSP_RES_FATAL	if there was a fatal error so we
					should abort processing.
*/
typedef int	dk4_c16_handler_t(
  void				*obj,
  dk4_c16_t 			 c,
  dk4_text_stream_position_t	*pos,
  dk4_er_t			*erp
);

/**	Handler function for text lines.
	@param	obj	Object to modify while processing the character.
	@param	line	Text line to process.
	@param	lineno	Current line number.
	@param	erp	Error report, may be NULL.
	@return	DK4_TSP_RES_OK		if the character was processed
					successfully,
		DK4_TSP_RES_ERROR	if there was an error but we can
					continue,
		DK4_TSP_RES_FATAL	if there was a fata error so we
					should abort processing.
*/
typedef int	dk4_c16_line_handler_t(
  void		*obj,
  dk4_c16_t	*line,
  dk4_um_t	 lineno,
  dk4_er_t	*erp
);

/**	Structure for 16 bit character processing.
*/
typedef struct {
  union {
    dk4_utf8_decoder_t		 u08;	/**< UTF-8 decoder. */
    dk4_utf16_byte_decoder_t	 u16;	/**< UTF-16 decoder. */
    dk4_c32_byte_decoder_t	 c32;	/**< 32 bit char decoder. */
  } dec;				/**< Input decoder. */
  dk4_bom_detector_t		 bomd;	/**< BOM detector. */
  dk4_text_stream_position_t	 pos;	/**< Current position. */
  dk4_er_t			 er_en;	/**< Errors in input decoding. */
  dk4_er_t			 er_pr;	/**< Errors in processing. */
  union {
    dk4_c16_line_handler_t	*lh;	/**< Handler function for lines. */
    dk4_c16_handler_t		*ch;	/**< Handler function for char. */
  } fct;				/**< Handler function. */
  dk4_c16_t			*inbuf;	/**< Buffer for input line. */
  void				*obj;	/**< Object to modify in processing. */
  size_t			 in_sz;	/**< Size of input line buffer. */
  size_t			 in_us;	/**< Used bytes in input line buffer. */
  int				 ief;	/**< Input encoding found. */
  int				 iee;	/**< Input encoding expected. */
  int				 pst;	/**< Processing stage. */
} dk4_tsp16_t;



#ifdef __cplusplus
extern "C" {
#endif

/**	Set up processor for byte by byte processing.
	@param	tsp	Processor to set up.
	@param	obj	Object to modify when processing input, may be NULL.
	@param	fct	Handler function to call for each character.
	@param	eie	Expected input encoding.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
*/
int
dk4tsp16_setup_char(
  dk4_tsp16_t		*tsp,
  void			*obj,
  dk4_c16_handler_t	*fct,
  int			 eie,
  dk4_er_t		*erp
);

/**	Set up processor for line processing.
	@param	tsp	Processor to set up.
	@param	obj	Object to modify when processing input, may be NULL.
	@param	fct	Handler function to invoke for each line.
	@param	inbuf	Input line buffer.
	@param	szin	Size of input line buffer (number of dk4_c16_t).
	@param	eie	Expected input encoding.
	@param	erp	Error report, may be NULL.
	@return	1 on success, 0 on error.
*/
int
dk4tsp16_setup_line(
  dk4_tsp16_t			*tsp,
  void				*obj,
  dk4_c16_line_handler_t	*fct,
  dk4_c16_t			*inbuf,
  size_t			 szin,
  int				 eie,
  dk4_er_t			*erp
);

/**	Add one single byte.
	@param	tsp	Text stream processor.
	@param	inbyte	Byte to process.
	@return	DK4_TSP_RES_OK		if the character was processed
					successfully,
		DK4_TSP_RES_ERROR	if there was an error but we can
					continue,
		DK4_TSP_RES_FATAL	if there was a fata error so we
					should abort processing.
*/
int
dk4tsp16_add_one_byte(
  dk4_tsp16_t	*tsp,
  unsigned char	 inbyte
);

/**	Add multiple bytes.
	@param	tsp	Text stream processor.
	@param	buffer	Buffer start address.
	@param	sz	Number of bytes in buffer.
	@return	DK4_TSP_RES_OK		if the character was processed
					successfully,
		DK4_TSP_RES_ERROR	if there was an error but we can
					continue,
		DK4_TSP_RES_FATAL	if there was a fata error so we
					should abort processing.
*/
int
dk4tsp16_add_bytes(
  dk4_tsp16_t		*tsp,
  const unsigned char	*buffer,
  size_t		 sz
);

/**	Finish processing.
	@param	tsp	Text stream processor.
	@return	DK4_TSP_RES_OK		if processing was finished
					successfully,
		DK4_TSP_RES_ERROR	if there was an error,
		DK4_TSP_RES_FATAL	if there was a fatal error.
*/
int
dk4tsp16_finish(dk4_tsp16_t *tsp);

/**	Retrieve error reports for encoding/decoding and processing.
	@param	er_en	Destination error report buffer for encoding/decoding.
	@param	er_pr	Destination error report buffer for processing.
	@param	tsp	Text stream processor to retrieve errors from.
*/
void
dk4tsp16_get_errors(dk4_er_t *er_en, dk4_er_t *er_pr, dk4_tsp16_t *tsp);

#ifdef __cplusplus
}
#endif



%%	module

#include "dk4tsp16.h"
#include "dk4enc.h"
#include "dk4mem.h"
#include "dk4ansi.h"
#include "dk4utf8.h"
#include "dk4utf16.h"
#include "dk4c32.h"



$!trace-include



/**	Initialize text stream processing structure.
	@param	tsp	Text stream processor.
	@param	eie	Expected input encoding.
*/
static
void
dk4tsp16_init(dk4_tsp16_t *tsp, int eie)
{
  DK4_MEMRES(tsp, sizeof(dk4_tsp16_t));
  dk4bom_detect_init(&(tsp->bomd), eie);
  dk4error_init(&(tsp->er_en));
  dk4error_init(&(tsp->er_pr));
  tsp->inbuf = NULL;
  tsp->obj = NULL;
  tsp->in_sz = 0;
  tsp->in_us = 0;
  tsp->ief = eie;
  tsp->iee = eie;
  tsp->pst = 0;
  (tsp->pos).bytes  = (dk4_um_t)0UL;
  (tsp->pos).chars  = (dk4_um_t)1UL;
  (tsp->pos).lineno = (dk4_um_t)1UL;
  (tsp->pos).charil = (dk4_um_t)1UL;
}



/**	Initialize decoder for found input encoding.
	@param	tsp	Text stream processor.
*/
static
void
dk4tsp16_initialize_decoder(dk4_tsp16_t *tsp)
{
  switch (tsp->ief) {
    case DK4_FILE_ENCODING_UTF8: {
      dk4utf8_init(&((tsp->dec).u08));
    } break;
    case DK4_FILE_ENCODING_UTF16_LE: {
      dk4utf16_byte_init(&((tsp->dec).u16), 0);
    } break;
    case DK4_FILE_ENCODING_UTF16_BE: {
      dk4utf16_byte_init(&((tsp->dec).u16), 1);
    } break;
    case DK4_FILE_ENCODING_32_LE: {
      dk4c32_decoder_init(&((tsp->dec).c32), 0);
    } break;
    case DK4_FILE_ENCODING_32_BE: {
      dk4c32_decoder_init(&((tsp->dec).c32), 1);
    } break;
  }
}



#if 0
static
int
dk4tsp16_process_character(
  dk4_tsp16_t	*tsp,
  dk4_c16_t	 chr
)
{
  int		 back	=	DK4_TSP_RES_FATAL;
  $? "+ dk4tsp16_process_character %04x", (unsigned)chr
  /* Increase position */
  (tsp->pos).chars  += (dk4_um_t)1UL;
  (tsp->pos).charil += (dk4_um_t)1UL;
  /* Check for line buffering or direct processing */
  if ((NULL != tsp->inbuf) && (0 < tsp->in_sz) && (NULL != (tsp->fct).lh)) {
    $? ". line buffering"
    if (tsp->in_us < tsp->in_sz) {
      (tsp->inbuf)[tsp->in_us] = chr;
      tsp->in_us += 1;
      back = DK4_TSP_RES_OK;
      if ((dk4_c16_t)'\n' == chr) {
        back = DK4_TSP_RES_FATAL;
        if (tsp->in_us < tsp->in_sz) {
	  (tsp->inbuf)[tsp->in_us] = (dk4_c16_t)'\0';
	  back = (*((tsp->fct).lh))(
	    tsp->obj,tsp->inbuf,(tsp->pos).lineno,&(tsp->er_pr)
	  );
	} else {
	  dk4error_set_with_position(
	    &(tsp->er_en), DK4_E_BUFFER_TOO_SMALL,
	    (tsp->pos).bytes, (tsp->pos).lineno,
	    (tsp->pos).chars, (tsp->pos).charil
	  );
	}
	tsp->in_us = 0;
      }
    } else {
      dk4error_set_with_position(
        &(tsp->er_en), DK4_E_BUFFER_TOO_SMALL,
        (tsp->pos).bytes, (tsp->pos).lineno,
        (tsp->pos).chars, (tsp->pos).charil
      );
    }
  } else {
    $? ". direct processing"
    if (NULL != (tsp->fct).ch) {
      back = (*((tsp->fct).ch))(tsp->obj, chr, &(tsp->pos), &(tsp->er_pr));
    }
  }
  /* Increase line number for newline characters */
  if ((dk4_c16_t)('\n') == chr) {
    (tsp->pos).lineno += (dk4_um_t)1UL;
    (tsp->pos).charil  = (dk4_um_t)1UL;
  } $? "- dk4tsp16_process_character %d", back
  return back;
}
#endif



/**	Process a group of 16 bit characters, the group represents
	one 32 bit character.
	@param	tsp	Text stream processor.
	@param	buf	Buffer of 16 bit characters.
	@param	sz	Number of 16 bit characters.
	@return	DK4_TSP_RES_OK		if the characters were processed
					successfully,
		DK4_TSP_RES_ERROR	if there was an error but we can
					continue,
		DK4_TSP_RES_FATAL	if there was a fatal error so
					we should abort processing.
*/
static
int
dk4tsp16_process_group(dk4_tsp16_t *tsp, dk4_c16_t *buf, size_t sz)
{
  size_t	 i	= 	0;
  int		 back	=	DK4_TSP_RES_FATAL;
  int		 res	=	DK4_TSP_RES_FATAL;
  $? "+ dk4tsp16_process_group"
  /* Increase position */
  (tsp->pos).chars  += (dk4_um_t)1UL;
  (tsp->pos).charil += (dk4_um_t)1UL;
  /* Check for line buffering or direct processing */
  if ((NULL != tsp->inbuf) && (0 < tsp->in_sz) && (NULL != (tsp->fct).lh)) {
    $? ". line buffering"
    if (sz < tsp->in_sz) {
      if (tsp->in_us < (tsp->in_sz - sz)) {
        /* Append group to line and increase used size */
        DK4_MEMCPY(&((tsp->inbuf)[tsp->in_us]),buf,(sizeof(dk4_c16_t)*sz));
	tsp->in_us += sz;
	back = DK4_TSP_RES_OK;
	/* On newline, process the line buffer */
	if ((1 == sz) && ((dk4_c16_t)'\n' == buf[0])) {
	  back = DK4_TSP_RES_FATAL;
	  if (tsp->in_us < tsp->in_sz) {
	    (tsp->inbuf)[tsp->in_us] = (dk4_c16_t)'\0';
	    back = (*((tsp->fct).lh))(
	      tsp->obj,tsp->inbuf,(tsp->pos).lineno,&(tsp->er_pr)
	    );
	  } else {
	    /* ERROR: Buffer too small */
	    dk4error_set_with_position(
	      &(tsp->er_en), DK4_E_BUFFER_TOO_SMALL,
	      (tsp->pos).bytes, (tsp->pos).lineno,
	      (tsp->pos).chars, (tsp->pos).charil
	    );
	  }
	  tsp->in_us = 0;
	}
      } else {
        /* ERROR: Buffer too small */
	back = DK4_TSP_RES_FATAL;
	dk4error_set_with_position(
	  &(tsp->er_en), DK4_E_BUFFER_TOO_SMALL,
	  (tsp->pos).bytes, (tsp->pos).lineno,
	  (tsp->pos).chars, (tsp->pos).charil
	);
      }
    } else {
      /* ERROR: Buffer too small */
      back = DK4_TSP_RES_FATAL;
      dk4error_set_with_position(
        &(tsp->er_en), DK4_E_BUFFER_TOO_SMALL,
        (tsp->pos).bytes, (tsp->pos).lineno,
        (tsp->pos).chars, (tsp->pos).charil
      );
    }
  } else {
    $? ". direct char processing"
    if (NULL != (tsp->fct).ch) {
      back = DK4_TSP_RES_OK;
      for (i = 0; i < sz; i++) {
        res = (*((tsp->fct).ch))(tsp->obj, buf[i], &(tsp->pos), &(tsp->er_pr));
	switch (res) {
	  case DK4_TSP_RES_FATAL: {
	    back = DK4_TSP_RES_FATAL;
	  } break;
	  case DK4_TSP_RES_ERROR: {
	    if (DK4_TSP_RES_OK == back) { back = DK4_TSP_RES_ERROR; }
	  } break;
	}
      }
    } else {
      dk4error_set_with_position(
        &(tsp->er_en), DK4_E_INVALID_ARGUMENTS,
        (tsp->pos).bytes, (tsp->pos).lineno,
        (tsp->pos).chars, (tsp->pos).charil
      );
    }
  }
  /* If we have a newline, increase line number and reset char in line */
  if (1 == sz) {
    if ((dk4_c16_t)('\n') == buf[0]) {
      (tsp->pos).lineno += (dk4_um_t)1UL;
      (tsp->pos).charil  = (dk4_um_t)1UL;
    }
  }
  $? "- dk4tsp16_process_group %d", back
  return back;
}



/**	Normal processing for one byte.
	Retrieve a 32 bit character first, either by decoding directly
	or by adding to a decoder. In the next step encode the 32 bit
	character in one or two 16 bit characters and process these.
	@param	tsp	Text stream processor.
	@param	inbyte	Byte to process.
	@return	Operation result, one from DK4_TSP_RES_OK,
	DK4_TSP_RES_ERROR or DK4_TSP_RES_FATAL.
*/
static
int
dk4tsp16_process_byte(dk4_tsp16_t *tsp, unsigned char inbyte)
{
  dk4_c16_t	 buf[8];
  dk4_c32_t	 c32;
  size_t	 sz;
  int		 back	=	DK4_TSP_RES_FATAL;
  int		 cuc32	=	0;
  int		 res	=	0;
  /* Add byte to decoder, attempt to retrieve a 32 bit character */
  switch (tsp->ief) {
    case DK4_FILE_ENCODING_ASCII: {
      c32 = (dk4_c32_t)inbyte;
      cuc32 = 1;
    } break;
    case DK4_FILE_ENCODING_ANSI: {
      if (0 != dk4ansi_decode(&c32, inbyte)) {
        cuc32 = 1;
      } else {
	dk4error_set_with_position(
	  &(tsp->er_en), DK4_E_DECODING_FAILED,
	  (tsp->pos).bytes, (tsp->pos).lineno,
	  (tsp->pos).chars, (tsp->pos).charil
	);
      }
    } break;
    case DK4_FILE_ENCODING_UTF8: {
      res = dk4utf8_add(&((tsp->dec).u08), inbyte);
      switch (res) {
        case DK4_EDSTM_ERROR: {
	  dk4error_set_with_position(
	    &(tsp->er_en), DK4_E_DECODING_FAILED,
	    (tsp->pos).bytes, (tsp->pos).lineno,
	    (tsp->pos).chars, (tsp->pos).charil
	  );
	} break;
	case DK4_EDSTM_FINISHED: {
	  c32 = dk4utf8_get(&((tsp->dec).u08));
	  cuc32 = 1;
	  dk4utf8_init(&((tsp->dec).u08));
	} break;
	case DK4_EDSTM_ACCEPT: {
	  back = DK4_TSP_RES_OK;
	} break;
      }
    } break;
    case DK4_FILE_ENCODING_UTF16_LE: {
      res = dk4utf16_byte_add(&((tsp->dec).u16), inbyte);
      switch (res) {
        case DK4_EDSTM_ERROR: {
	  dk4error_set_with_position(
	    &(tsp->er_en), DK4_E_DECODING_FAILED,
	    (tsp->pos).bytes, (tsp->pos).lineno,
	    (tsp->pos).chars, (tsp->pos).charil
	  );
	} break;
	case DK4_EDSTM_FINISHED: {
	  c32 = dk4utf16_byte_get(&((tsp->dec).u16));
	  cuc32 = 1;
	  dk4utf16_byte_init(&((tsp->dec).u16), 0);
	} break;
	case DK4_EDSTM_ACCEPT: {
	  back = DK4_TSP_RES_OK;
	} break;
      }
    } break;
    case DK4_FILE_ENCODING_UTF16_BE: {
      res = dk4utf16_byte_add(&((tsp->dec).u16), inbyte);
      switch (res) {
        case DK4_EDSTM_ERROR: {
	  dk4error_set_with_position(
	    &(tsp->er_en), DK4_E_DECODING_FAILED,
	    (tsp->pos).bytes, (tsp->pos).lineno,
	    (tsp->pos).chars, (tsp->pos).charil
	  );
	} break;
	case DK4_EDSTM_FINISHED: {
	  c32 = dk4utf16_byte_get(&((tsp->dec).u16));
	  cuc32 = 1;
	  dk4utf16_byte_init(&((tsp->dec).u16), 1);
	} break;
	case DK4_EDSTM_ACCEPT: {
	  back = DK4_TSP_RES_OK;
	} break;
      }
    } break;
    case DK4_FILE_ENCODING_32_LE: {
      res = dk4c32_decoder_add(&((tsp->dec).c32), inbyte);
      switch (res) {
        case DK4_EDSTM_ERROR: {
	  dk4error_set_with_position(
	    &(tsp->er_en), DK4_E_DECODING_FAILED,
	    (tsp->pos).bytes, (tsp->pos).lineno,
	    (tsp->pos).chars, (tsp->pos).charil
	  );
	} break;
	case DK4_EDSTM_FINISHED: {
	  c32 = dk4c32_decoder_get(&((tsp->dec).c32));
	  cuc32 = 1;
	  dk4c32_decoder_init(&((tsp->dec).c32), 0);
	} break;
	case DK4_EDSTM_ACCEPT: {
	  back = DK4_TSP_RES_OK;
	} break;
      }
    } break;
    case DK4_FILE_ENCODING_32_BE: {
      res = dk4c32_decoder_add(&((tsp->dec).c32), inbyte);
      switch (res) {
        case DK4_EDSTM_ERROR: {
	  dk4error_set_with_position(
	    &(tsp->er_en), DK4_E_DECODING_FAILED,
	    (tsp->pos).bytes, (tsp->pos).lineno,
	    (tsp->pos).chars, (tsp->pos).charil
	  );
	} break;
	case DK4_EDSTM_FINISHED: {
	  c32 = dk4c32_decoder_get(&((tsp->dec).c32));
	  cuc32 = 1;
	  dk4c32_decoder_init(&((tsp->dec).c32), 1);
	} break;
	case DK4_EDSTM_ACCEPT: {
	  back = DK4_TSP_RES_OK;
	} break;
      }
    } break;
  }
  /* Process 32 bit character if we have a 32 bit char to process */
  if (0 != cuc32) {
    sz = DK4_SIZEOF(buf,dk4_c16_t);
    if (0 != dk4utf16_encode(buf, &sz, c32, NULL)) {
#if 0
      back = DK4_TSP_RES_OK;
      for (i = 0; ((i < sz) && (DK4_TSP_RES_FATAL != back)); i++) {
        switch (dk4tsp16_process_character(tsp, buf[i])) {
	  case DK4_TSP_RES_FATAL: {
	    back = DK4_TSP_RES_FATAL;
	  } break;
	  case DK4_TSP_RES_ERROR: {
	    if (DK4_TSP_RES_OK == back) { back = DK4_TSP_RES_ERROR; }
	  } break;
	}
      }
#else
      back = dk4tsp16_process_group(tsp, buf, sz);
#endif
    } else {
      dk4error_set_with_position(
        &(tsp->er_en), DK4_E_ENCODING_FAILED,
        (tsp->pos).bytes, (tsp->pos).lineno,
        (tsp->pos).chars, (tsp->pos).charil
      );
    }
  }
  if (DK4_TSP_RES_FATAL == back) {
    tsp->pst = 2;
  }
  return back;
}



/**	Add one byte to internal data structures
	(BOM detection and/or normal processing).
	@param	tsp	Text stream processor.
	@param	inbyte	Byte to add.
	@return	Operation result, one from DK4_TSP_RES_OK,
	DK4_TSP_RES_ERROR or DK4_TSP_RES_FATAL.
*/
static
int
dk4tsp16_i_add_one_byte(
  dk4_tsp16_t	*tsp,
  unsigned char	 inbyte
)
{
  size_t	 nrej;
  size_t	 i;
  int		 back	=	DK4_TSP_RES_FATAL;
  int		 res;
  unsigned char	 uc;
  $? "+ dk4tsp16_i_add_one_byte"
  (tsp->pos).bytes += (dk4_um_t)1UL;
  switch (tsp->pst) {
    case 0: {			$? ". bom detection"
      res = dk4bom_detect_add(&(tsp->bomd), inbyte);
      switch (res) {
        case DK4_EDSTM_ACCEPT: {
	  back = DK4_TSP_RES_OK;
	} break;
	case DK4_EDSTM_FINISHED: case DK4_EDSTM_FINISHED_WITH_UNUSED: {
	  /* Result is acceptable */
	  back = DK4_TSP_RES_OK;
	  /* Retrieve found encoding */
	  tsp->ief = dk4bom_detect_get_encoding(&(tsp->bomd));
	  /* If necessary, initialize decoder */
	  dk4tsp16_initialize_decoder(tsp);
	  /* Switch to normal processing */
	  tsp->pst = 1;
	  /* Process bytes stored in BOM detector */
	  if (DK4_EDSTM_FINISHED_WITH_UNUSED == res) {
	    nrej = dk4bom_detect_num_unused_bytes(&(tsp->bomd));
	    if (0 < nrej) {
	      for (i = 0; ((i < nrej) && (DK4_TSP_RES_FATAL != back)); i++) {
	        uc = dk4bom_detect_unused_byte(&(tsp->bomd), i);
		switch (dk4tsp16_process_byte(tsp, uc)) {
		  case DK4_TSP_RES_FATAL: {
		    back = DK4_TSP_RES_FATAL;
		  } break;
		  case DK4_TSP_RES_ERROR: {
		    if (DK4_TSP_RES_OK == back) {
		      back = DK4_TSP_RES_ERROR;
		    }
		  } break;
		}
	      }
	    }
	  }
	} break;
      }
    } break;
    case 1: {			$? ". normal processing"
      back = dk4tsp16_process_byte(tsp, inbyte);
    } break;
    /*
    	Processing stage 2 indicates there was a serious error
	before, we must skip further processing.
	This situation is covered by the initialization value
	DK4_TSP_RES_FATAL, so we do not need a case branch here.
    */
  }
  $? "- dk4tsp16_i_add_one_byte %d", back
  return back;
}



int
dk4tsp16_setup_char(
  dk4_tsp16_t		*tsp,
  void			*obj,
  dk4_c16_handler_t	*fct,
  int			 eie,
  dk4_er_t		*erp
)
{
  int		 back	=	0;
  if (NULL != tsp) {
    dk4tsp16_init(tsp, eie);
    if (NULL != fct) {
      tsp->obj = obj;
      (tsp->fct).ch = fct;
      tsp->iee = eie;
      tsp->ief = eie;
      tsp->pst = 0;
      back = 1;
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
      tsp->pst = 2;
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}



int
dk4tsp16_setup_line(
  dk4_tsp16_t			*tsp,
  void				*obj,
  dk4_c16_line_handler_t	*fct,
  dk4_c16_t			*inbuf,
  size_t			 szin,
  int				 eie,
  dk4_er_t			*erp
)
{
  int		 back	=	0;
  if (NULL != tsp) {
    dk4tsp16_init(tsp, eie);
    if ((NULL != fct) && (NULL != inbuf) && (0 < szin)) {
      tsp->obj = obj;
      (tsp->fct).lh = fct;
      tsp->inbuf = inbuf;
      tsp->in_sz = szin;
      tsp->in_us = 0;
      tsp->iee = eie;
      tsp->ief = eie;
      tsp->pst = 0;
      back = 1;
    } else {
      dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
      tsp->pst = 2;
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}



int
dk4tsp16_add_one_byte(
  dk4_tsp16_t	*tsp,
  unsigned char	 inbyte
)
{
  int		 back	=	DK4_TSP_RES_FATAL;
  if (NULL != tsp) {
    if (2 > tsp->pst) {
      back = dk4tsp16_i_add_one_byte(tsp, inbyte);
    }
  }
  return back;
}



int
dk4tsp16_add_bytes(
  dk4_tsp16_t		*tsp,
  const unsigned char	*buffer,
  size_t		 sz
)
{
  int		back	=	DK4_TSP_RES_FATAL;	/* Function result */
  int		res;					/* Processing result */
  if ((NULL != tsp) && (NULL != buffer) && (0 < sz)) {
    if (2 > tsp->pst) {
      back = DK4_TSP_RES_OK;
      while ((sz--) && (2 > tsp->pst)) {
        res = dk4tsp16_i_add_one_byte(tsp, *(buffer++));
	switch (res) {
	  case DK4_TSP_RES_FATAL: {
	    back = DK4_TSP_RES_FATAL;
	  } break;
	  case DK4_TSP_RES_ERROR: {
	    if (DK4_TSP_RES_OK == back) {
	      back = DK4_TSP_RES_ERROR;
	    }
	  } break;
	}
      }
    }
  }
  return back;
}



int
dk4tsp16_finish(dk4_tsp16_t *tsp)
{
  size_t	 nrej =	0;			/* Number of unused bytes */
  size_t	 i    =	0;			/* Current unused byte index */
  int		 back =	DK4_TSP_RES_FATAL;	/* Function result */
  int		 res;				/* Operation result */
  unsigned char	 uc;				/* Current unused byte */
  if (NULL != tsp) {
    /*	Flush all unprocessed output
	1. If there are unprocessed bytes in the BOM detector as BOM
	   detection was not completed, process these bytes.
	2. If there are characters in the line buffer,
	   finalize the line buffer text and process it.
    */
    back = DK4_TSP_RES_OK;
    /* Retrieve an process bytes stored in BOM detector */
    if (0 == tsp->pst) {
      tsp->pst = 1;
      nrej = dk4bom_detect_num_unused_bytes(&(tsp->bomd));
      if (0 < nrej) {
        dk4tsp16_initialize_decoder(tsp);
	for (i = 0; ((i < nrej) && (2 > tsp->pst)); i++) {
	  uc = dk4bom_detect_unused_byte(&(tsp->bomd), i);
	  switch (dk4tsp16_process_byte(tsp, uc)) {
	    case DK4_TSP_RES_FATAL: {
	      back = DK4_TSP_RES_FATAL;
	      tsp->pst = 2;
	    } break;
	    case DK4_TSP_RES_ERROR: {
	      if (DK4_TSP_RES_OK == back) { back = DK4_TSP_RES_ERROR; }
	    } break;
	  }
	}
      }
    }
    /* Process final line */
    if ((NULL != tsp->inbuf) && (0 < tsp->in_sz) && (NULL != (tsp->fct).lh)) {
      if (0 < tsp->in_us) {
        if (2 > tsp->pst) {
	  if (tsp->in_us < tsp->in_sz) {
	    (tsp->inbuf)[tsp->in_us] = (dk4_c16_t)'\0';
	    res =
	    (*((tsp->fct).lh))(
	      tsp->obj,tsp->inbuf,(tsp->pos).lineno,&(tsp->er_pr)
	    );
	    switch (res) {
	      case DK4_TSP_RES_FATAL: {
	        back = DK4_TSP_RES_FATAL;
		tsp->pst = 2;
	      } break;
	      case DK4_TSP_RES_ERROR: {
	        if (DK4_TSP_RES_OK == back) { back = DK4_TSP_RES_ERROR; }
	      } break;
	    }
	  } else {
            back = DK4_TSP_RES_FATAL;
	    tsp->pst = 2;
            dk4error_set_with_position(
              &(tsp->er_en), DK4_E_BUFFER_TOO_SMALL,
              (tsp->pos).bytes, (tsp->pos).lineno,
              (tsp->pos).chars, (tsp->pos).charil
            );
	  }
        }
      }
    }
  }
  return back;
}



void
dk4tsp16_get_errors(dk4_er_t *er_en, dk4_er_t *er_pr, dk4_tsp16_t *tsp)
{
  if (NULL != tsp) {
    if (NULL != er_en) {
      DK4_MEMCPY(er_en, &(tsp->er_en), sizeof(dk4_er_t));
    }
    if (NULL != er_pr) {
      DK4_MEMCPY(er_pr, &(tsp->er_pr), sizeof(dk4_er_t));
    }
  }
}