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path: root/support/dktools/dk4rld.c
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/*
Copyright (C) 2015-2020, Dirk Krause
SPDX-License-Identifier: BSD-3-Clause
*/

/*
	WARNING: This file was generated by the dkct program (see
	http://dktools.sourceforge.net/ for details).
	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
*/

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


#line 139 "dk4rld.ctr"

#include "dk4conf.h"

#if	DK4_HAVE_ASSERT_H
#ifndef	ASSERT_H_INCLUDED
#include <assert.h>
#define	ASSERT_H_INCLUDED 1
#endif
#endif

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





#line 156 "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 187 "dk4rld.ctr"
#if	DK4_USE_ASSERT
  assert(NULL != dec);
#endif
  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 198 "dk4rld.ctr"
}



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

#line 207 "dk4rld.ctr"
#if	DK4_USE_ASSERT
  assert(NULL != dec);
#endif
  if (NULL != dec) {
    switch (dec->st) {
      case RLD_ST_EXPECT_KEY_BYTE : {
        if ((unsigned char)128U > 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)128U < 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 259 "dk4rld.ctr"
  return back;
}



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

#line 269 "dk4rld.ctr"
#if	DK4_USE_ASSERT
  assert(NULL != dec);
#endif
  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 284 "dk4rld.ctr"
  return back;
}



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

#line 299 "dk4rld.ctr"
#if	DK4_USE_ASSERT
  assert(NULL != dptr);
  assert(NULL != szptr);
  assert(NULL != dec);
#endif
  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 316 "dk4rld.ctr"
  return back;
}