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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: dk4ahd.ctr
*/

/**	@file dk4ahd.c The dk4ahd module.
*/


#line 118 "dk4ahd.ctr"

#include "dk4conf.h"

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

#include "dk4ahd.h"
#include "dk4mem.h"
#include "dk4edstm.h"





#line 135 "dk4ahd.ctr"



void
dk4ahex_dec_init(dk4_ahex_dec_t *dec, dk4_er_t *erp)
{
#if	DK4_USE_ASSERT
  assert(NULL != dec);
#endif
  if (NULL != dec) {
    DK4_MEMRES(dec, sizeof(dk4_ahex_dec_t));
    dec->cpos =  0;
    dec->obyte = 0x00;
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
}



int
dk4ahex_dec_add(dk4_ahex_dec_t *dec, char tc, dk4_er_t *erp)
{
  int		 back = DK4_EDSTM_ERROR;
#if	DK4_USE_ASSERT
  assert(NULL != dec);
#endif
  if (NULL != dec) {
    switch (tc) {
      case ' ' : case '\t' : case '\r' : case '\n' : case 0x00 : case 0x0C : {
        back = DK4_EDSTM_ACCEPT;
      } break;
      case '>' : {
        back = DK4_EDSTM_STOP;
      } break;
      case '0' : {
        if (0 != dec->cpos) {
          dec->cpos  = 2;
	} else {
	  dec->obyte = 0x00;
	  dec->cpos  = 1;
	}
      } break;
      case '1' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x01; dec->cpos  = 2;
	} else {
	  dec->obyte = 0x10; dec->cpos  = 1;
	}
      } break;
      case '2' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x02; dec->cpos  = 2;
	} else {
	  dec->obyte = 0x20; dec->cpos  = 1;
	}
      } break;
      case '3' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x03; dec->cpos  = 2;
	} else {
	  dec->obyte = 0x30; dec->cpos  = 1;
	}
      } break;
      case '4' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x04; dec->cpos  = 2;
	} else {
	  dec->obyte = 0x40; dec->cpos  = 1;
	}
      } break;
      case '5' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x05; dec->cpos  = 2;
	} else {
	  dec->obyte = 0x50; dec->cpos  = 1;
	}
      } break;
      case '6' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x06; dec->cpos  = 2;
	} else {
	  dec->obyte = 0x60; dec->cpos  = 1;
	}
      } break;
      case '7' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x07; dec->cpos  = 2;
	} else {
	  dec->obyte = 0x70; dec->cpos  = 1;
	}
      } break;
      case '8' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x08; dec->cpos  = 2;
	} else {
	  dec->obyte = 0x80; dec->cpos  = 1;
	}
      } break;
      case '9' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x09; dec->cpos  = 2;
	} else {
	  dec->obyte = 0x90; dec->cpos  = 1;
	}
      } break;
      case 'a' : case 'A' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x0A; dec->cpos  = 2;
	} else {
	  dec->obyte = 0xA0; dec->cpos  = 1;
	}
      } break;
      case 'b' : case 'B' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x0B; dec->cpos  = 2;
	} else {
	  dec->obyte = 0xB0; dec->cpos  = 1;
	}
      } break;
      case 'c' : case 'C' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x0C; dec->cpos  = 2;
	} else {
	  dec->obyte = 0xC0; dec->cpos  = 1;
	}
      } break;
      case 'd' : case 'D' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x0D; dec->cpos  = 2;
	} else {
	  dec->obyte = 0xD0; dec->cpos  = 1;
	}
      } break;
      case 'e' : case 'E' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x0E; dec->cpos  = 2;
	} else {
	  dec->obyte = 0xE0; dec->cpos  = 1;
	}
      } break;
      case 'f' : case 'F' : {
        if (0 != dec->cpos) {
	  dec->obyte |= 0x0F; dec->cpos  = 2;
	} else {
	  dec->obyte = 0xF0; dec->cpos  = 1;
	}
      } break;
    }
    if (2 == dec->cpos) {
      dec->cpos = 0;
      back = DK4_EDSTM_FINISHED;
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}



int
dk4ahex_finish(dk4_ahex_dec_t *dec, dk4_er_t *erp)
{
  int		 back	=	DK4_EDSTM_ERROR;
#if	DK4_USE_ASSERT
  assert(NULL != dec);
#endif
  if (NULL != dec) {
    switch (dec->cpos) {
      case 1: {
        back = DK4_EDSTM_FINISHED;
      } break;
      default : {
        back = DK4_EDSTM_ACCEPT;
      } break;
    }
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}



unsigned char
dk4ahex_output(dk4_ahex_dec_t const *dec, dk4_er_t *erp)
{
  unsigned char back	= 0x00;
#if	DK4_USE_ASSERT
  assert(NULL != dec);
#endif
  if (NULL != dec) {
    back = dec->obyte;
  } else {
    dk4error_set_simple_error_code(erp, DK4_E_INVALID_ARGUMENTS);
  }
  return back;
}