rules.c

IRDA 1.0 标准协议源代码

/*
  Copyright (C) 2002-2003 Gerd Rausch, BlauLogic (http://blaulogic.com)
  All rights reserved.

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

  1. Redistributions of source code must retain the above copyright
     notice, this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.

  3. Except as contained in this notice, neither the name of BlauLogic
     nor the name(s) of the author(s) may be used to endorse or promote
     products derived from this software without specific prior written
     permission.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  IN NO EVENT SHALL THE AUTHOR(S) OR BLAULOGIC BE LIABLE FOR ANY CLAIM,
  DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
  THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

#include <inttypes.h>
#include <string.h>
#include <pgmspace.h>
#include <eeprom.h>
#include <io.h>

#include "rules.h"

#if E2END>=3

static inline uint8_t digit_count(char *number)
{
  uint8_t count;
  char *cp;

  count=0;
  for(cp=number; *cp && *cp!=','; cp++) {
    if((*cp>='0' && *cp<='9') ||
       *cp=='*' || *cp=='#')
      count++;
  }

  return count;
}

static inline uint8_t number_matches(char *number, uint16_t prefix_addr, uint8_t prefix_len)
{
  uint8_t i;

  for(i=0; number[i] && i<prefix_len; i++) {
    if(number[i]!=(char)eeprom_rb(prefix_addr+i))
      return 0;
  }

  return i==prefix_len;
}

static void replace_number(char *buf, uint16_t buf_size,
			   uint16_t repl_addr, uint8_t repl_len,
			   char *number)
{
  uint16_t number_len, i;

  number_len=strlen(number);

  if(number_len+repl_len>=buf_size) {
    buf[0]=0;
    return;
  }

  memmove(buf+repl_len, number, number_len+1);

  for(i=0; i<repl_len; i++)
    buf[i]=(char)eeprom_rb(repl_addr+i);
}

void rules_apply(char *number, uint16_t size)
{
  uint16_t addr, next_addr;
  Rule rule;
  uint8_t state;

  state=0;
  for(addr=2; addr+sizeof(Rule)<=E2END+1 && eeprom_rw(addr)!=0xFFFF; addr=next_addr) {
    eeprom_read_block(&rule, addr, sizeof(Rule));

    next_addr=addr+sizeof(Rule)+rule.prefix_len+rule.repl_len;
    if(next_addr>E2END+1)
      break;

    if(rule.digit_count!=0xFF &&
       digit_count(number)!=rule.digit_count)
      continue;

    if((state & rule.state_filter_mask)!=rule.state_filter_value ||
       !number_matches(number, addr+sizeof(Rule), rule.prefix_len))
      continue;

    replace_number(number, size,
		   addr+sizeof(Rule)+rule.prefix_len, rule.repl_len,
		   number+rule.prefix_len);

    state&=rule.state_mod_mask;
    state^=rule.state_mod_toggle;
  }
}

void rules_parse(Rules_Parse_Context *context_p, uint8_t *data, uint16_t size)
{
  uint16_t addr, i;
#ifndef IRDIAL_SLOW_EEPROM
  uint16_t j;
#endif

  i=0;
  while(i<size) {
    switch(context_p->state) {
    case RULES_PARSE_STATE_INITIAL:
      if(data[i]=='\r' || data[i]=='\n') {
	context_p->state=RULES_PARSE_STATE_WHITESPACE;
	context_p->access_code=0xFFFF;
	context_p->eeprom_addr=2;
	memset(&context_p->rule, 0, sizeof(Rule));
	context_p->rule.digit_count=0xFF;
      }
      i++;
      break;
    case RULES_PARSE_STATE_WHITESPACE:
      switch(data[i]) {
      case '#':
	context_p->state=RULES_PARSE_STATE_ACCESS_CODE;
	context_p->access_code=0;
	break;
      case '=':
	context_p->state=RULES_PARSE_STATE_DIGIT_COUNT;
	context_p->rule.digit_count=0;
	break;
      case '-':
	context_p->state=RULES_PARSE_STATE_FILTER;
	context_p->mask_bit_on=0;
	context_p->mask_bit_shift=0;
	break;
      case '+':
	context_p->state=RULES_PARSE_STATE_FILTER;
	context_p->mask_bit_on=1;
	context_p->mask_bit_shift=0;
	break;
      case '/':
	if(context_p->access_code==eeprom_rw(0))
	  context_p->state=RULES_PARSE_STATE_PREFIX;
	else
	  context_p->state=RULES_PARSE_STATE_DONE;
	break;
      case ' ':
      case '\t':
      case '\r':
      case '\n':
	break;
      default:
	context_p->state=RULES_PARSE_STATE_DONE;
      }
      i++;
      break;
    case RULES_PARSE_STATE_ACCESS_CODE:
      if(data[i]>='0' && data[i]<='9') {
	context_p->access_code=context_p->access_code*10+data[i++]-'0';
      } else {
	if(eeprom_rw(0)==0xFFFF) {
	  eeprom_wb(0, context_p->access_code);
	  eeprom_wb(1, context_p->access_code>>8);
	}
	context_p->state=RULES_PARSE_STATE_WHITESPACE;
      }
      break;
    case RULES_PARSE_STATE_DIGIT_COUNT:
      if(data[i]>='0' && data[i]<='9') {
	context_p->rule.digit_count=context_p->rule.digit_count*10+data[i++]-'0';
      } else
	context_p->state=RULES_PARSE_STATE_WHITESPACE;
      break;
    case RULES_PARSE_STATE_FILTER:
      if(data[i]>='0' && data[i]<='9') {
	context_p->mask_bit_shift=context_p->mask_bit_shift*10+data[i++]-'0';
      } else {
	context_p->rule.state_filter_mask|=1<<context_p->mask_bit_shift;
	context_p->rule.state_filter_value|=context_p->mask_bit_on<<context_p->mask_bit_shift;
	context_p->state=RULES_PARSE_STATE_WHITESPACE;
      }
      break;
    case RULES_PARSE_STATE_PREFIX:
      if(data[i]!='/') {
	addr=context_p->eeprom_addr+sizeof(Rule)+context_p->rule.prefix_len;
	if(addr<=E2END) {
#ifdef IRDIAL_SLOW_EEPROM
	  context_p->tmp_eeprom[addr]=data[i];
#else
	  eeprom_wb(addr, data[i]);
#endif
	}
	context_p->rule.prefix_len++;
      } else
	context_p->state=RULES_PARSE_STATE_REPL;
      i++;
      break;
    case RULES_PARSE_STATE_REPL:
      if(data[i]!='/') {
	addr=context_p->eeprom_addr+sizeof(Rule)+context_p->rule.prefix_len+context_p->rule.repl_len;
	if(addr<=E2END) {
#ifdef IRDIAL_SLOW_EEPROM
	  context_p->tmp_eeprom[addr]=data[i];
#else
	  eeprom_wb(addr, data[i]);
#endif
	}
	context_p->rule.repl_len++;
      } else
	context_p->state=RULES_PARSE_STATE_MOD_TEST;
      i++;
      break;
    case RULES_PARSE_STATE_MOD_TEST:
      switch(data[i]) {
      case '-':
	context_p->state=RULES_PARSE_STATE_MOD;
	context_p->mask_bit_on=0;
	context_p->mask_bit_shift=0;
	i++;
	break;
      case '+':
	context_p->state=RULES_PARSE_STATE_MOD;
	context_p->mask_bit_on=1;
	context_p->mask_bit_shift=0;
	i++;
	break;
      default:
	context_p->rule.state_mod_mask^=0xFF;

	addr=context_p->eeprom_addr+sizeof(Rule)+context_p->rule.prefix_len+context_p->rule.repl_len;
	if(addr<=E2END-1) {
#ifdef IRDIAL_SLOW_EEPROM
	  memcpy(context_p->tmp_eeprom+context_p->eeprom_addr, &context_p->rule, sizeof(Rule));
#else
	  for(j=0; j<sizeof(Rule); j++)
	    eeprom_wb(context_p->eeprom_addr+j, ((uint8_t *)&context_p->rule)[j]);
#endif

	  context_p->eeprom_addr=addr;

	  context_p->state=RULES_PARSE_STATE_WHITESPACE;
	  memset(&context_p->rule, 0, sizeof(Rule));
	  context_p->rule.digit_count=0xFF;
	} else
	  context_p->state=RULES_PARSE_STATE_DONE;
      }
      break;
    case RULES_PARSE_STATE_MOD:
      if(data[i]>='0' && data[i]<='9') {
	context_p->mask_bit_shift=context_p->mask_bit_shift*10+data[i++]-'0';
      } else {
	context_p->rule.state_mod_mask|=1<<context_p->mask_bit_shift;
	context_p->rule.state_mod_toggle|=context_p->mask_bit_on<<context_p->mask_bit_shift;
	context_p->state=RULES_PARSE_STATE_MOD_TEST;
      }
      break;
    default:
      return;
    }
  }
}

void rules_parse_finish(Rules_Parse_Context *context_p, uint8_t success)
{
#ifdef IRDIAL_SLOW_EEPROM
  uint16_t addr;
#endif

  if(context_p->access_code!=eeprom_rw(0))
    return;

  if(!success)
    context_p->eeprom_addr=2;

#ifdef IRDIAL_SLOW_EEPROM
  for(addr=2; addr<context_p->eeprom_addr; addr++)
    eeprom_wb(addr, context_p->tmp_eeprom[addr]);
#endif

  /* write sentinel */
  eeprom_wb(context_p->eeprom_addr, 0xFF);
  eeprom_wb(context_p->eeprom_addr+1, 0xFF);
}

#else /* E2END<3 */

void rules_apply(char *number, uint16_t size)
{
}
void rules_parse(Rules_Parse_Context *context_p, uint8_t *data, uint16_t size)
{
}
void rules_parse_finish(Rules_Parse_Context *context_p, uint8_t success)
{
}

#endif /* E2END<3 */