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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: dk4rld.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.
*/

/**	@file dk4rld.c The dk4rld module.
*/


#line 121 "dk4rld.ctr"

#include "dk4rld.h"
#include "dk4edstm.h"
#include "dk4mem.h"





#line 129 "dk4rld.ctr"



/**	Decoder states.
*/
enum {
				/**	Start state, exepect run length
					or literal data length.
				*/
  RLD_ST_EXPECT_KEY_BYTE	=	0,

				/**	Expect byte value for run.
				*/
  RLD_ST_EXPECT_RUN_BYTE ,

				/**	Expect literal byte.
				*/
  RLD_ST_EXPECT_LITERAL_BYTE ,

				/**	No further input accepted as
					EOD marker was found.
				*/
  RLD_ST_EOD_FOUND 
};



void
dk4rld_init(dk4_rl_dec_t *dec, dk4_er_t *erp)
{
  

#line 160 "dk4rld.ctr"
  if (NULL != dec) {
    DK4_MEMRES(dec, sizeof(dk4_rl_dec_t));
    dec->oused = 0;
    dec->ll    = 0;
    dec->st    = RLD_ST_EXPECT_KEY_BYTE;
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  } 

#line 168 "dk4rld.ctr"
}



int
dk4rld_add(dk4_rl_dec_t *dec, unsigned char inbyte, dk4_er_t *erp)
{
  int		 back	=	DK4_EDSTM_ERROR;
  

#line 177 "dk4rld.ctr"
  if (NULL != dec) {
    switch (dec->st) {
      case RLD_ST_EXPECT_KEY_BYTE : {
        if ((unsigned char)128 > inbyte) {
	  /*
	  	Literal byte sequence
	  */
	  dec->st = RLD_ST_EXPECT_LITERAL_BYTE;
	  dec->ll = (size_t)inbyte + 1;
	  back    = DK4_EDSTM_ACCEPT;
	} else {
	  if ((unsigned char)128 < inbyte) {
	    /*
	    	Run of equal bytes
	    */
	    dec->st = RLD_ST_EXPECT_RUN_BYTE;
	    dec->ll = (size_t)257 - (size_t)inbyte;
	    back    = DK4_EDSTM_ACCEPT;
	  } else {
	    /*
	    	EOD marker found
	    */
	    dec->st = RLD_ST_EOD_FOUND;
	    back    = DK4_EDSTM_STOP;
	  }
	}
      } break;
      case RLD_ST_EXPECT_RUN_BYTE : {
        dk4mem_set(&(dec->ob[0]), dec->ll, inbyte, NULL);
	dec->oused = dec->ll;
	dec->st = RLD_ST_EXPECT_KEY_BYTE;
	back = DK4_EDSTM_FINISHED;
      } break;
      case RLD_ST_EXPECT_LITERAL_BYTE : {
        dec->ob[0] = inbyte;
	dec->oused = 1;
	dec->ll -= 1;
	if (0 == dec->ll) {
	  dec->st = RLD_ST_EXPECT_KEY_BYTE;
	}
	back = DK4_EDSTM_FINISHED;
      } break;
      default : {
        dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
      } break;
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  } 

#line 226 "dk4rld.ctr"
  return back;
}



int
dk4rld_finish(dk4_rl_dec_t *dec, dk4_er_t *erp)
{
  int		 back	=	DK4_EDSTM_ERROR;
  

#line 236 "dk4rld.ctr"
  if (NULL != dec) {
    switch (dec->st) {
      case RLD_ST_EXPECT_KEY_BYTE : case RLD_ST_EOD_FOUND : {
        back = DK4_EDSTM_ACCEPT;
      } break;
      default : {
        dk4error_set_simple_error_code(erp, DK4_E_SYNTAX);
      } break;
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  } 

#line 248 "dk4rld.ctr"
  return back;
}



int
dk4rld_output(
  const unsigned char **dptr, size_t *szptr, dk4_rl_dec_t *dec, dk4_er_t *erp
)
{
  int		 back	=	0;
  

#line 260 "dk4rld.ctr"
  if (NULL != dec) {
    if (0 < dec->oused) {
      *dptr = &(dec->ob[0]);
      *szptr = dec->oused;
      back = 1;
    } else {
      *dptr = NULL;
      *szptr = 0;
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  } 

#line 272 "dk4rld.ctr"
  return back;
}