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/***************************************************************************
plaparse.h
Parser for Berkeley standard PLA files into raw fusemaps.
****************************************************************************
Copyright Aaron Giles
All rights reserved.
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 copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the
distribution.
* Neither the name 'MAME' nor the names of its contributors may be
used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY AARON GILES ''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 AARON GILES 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.
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "jedparse.h"
#include "plaparse.h"
/***************************************************************************
DEBUGGING
***************************************************************************/
#define LOG_PARSE 0
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
struct parse_info
{
UINT32 inputs;
UINT32 outputs;
UINT32 terms;
};
/***************************************************************************
UTILITIES
***************************************************************************/
/*-------------------------------------------------
iscrlf - is a line feed character
-------------------------------------------------*/
static int iscrlf(char c)
{
return (c == 13 || c == 10);
}
/*-------------------------------------------------
suck_number - read a decimal value from the
character stream
-------------------------------------------------*/
static UINT32 suck_number(const UINT8 **psrc)
{
const UINT8 *src = *psrc;
UINT32 value = 0;
// loop over and accumulate digits
while (isdigit(*src))
{
value = value * 10 + *src - '0';
src++;
}
// return a pointer to the string afterwards
*psrc = src;
return value;
}
/***************************************************************************
CORE IMPLEMENTATION
***************************************************************************/
/*-------------------------------------------------
process_field - process a single field
-------------------------------------------------*/
static void process_field(jed_data *data, const UINT8 *cursrc, const UINT8 *srcend, parse_info *pinfo)
{
cursrc++;
// switch off of the field type
switch (*cursrc)
{
// number of inputs
case 'i':
cursrc += 2;
pinfo->inputs = suck_number(&cursrc);
if (LOG_PARSE) printf("Inputs: %u\n", pinfo->inputs);
break;
// number of outputs
case 'o':
cursrc += 2;
pinfo->outputs = suck_number(&cursrc);
if (LOG_PARSE) printf("Outputs: %u\n", pinfo->outputs);
break;
// number of product terms
case 'p':
{
cursrc += 2;
pinfo->terms = suck_number(&cursrc);
if (LOG_PARSE) printf("Terms: %u\n", pinfo->terms);
UINT32 curfuse = 0;
bool outputs = false;
cursrc++;
while (cursrc < srcend && *cursrc != '.')
{
switch (*cursrc)
{
case '-':
if (!outputs)
{
jed_set_fuse(data, curfuse++, 1);
jed_set_fuse(data, curfuse++, 1);
if (LOG_PARSE) printf("11");
}
break;
case '1':
if (outputs)
{
jed_set_fuse(data, curfuse++, 0);
if (LOG_PARSE) printf("0");
}
else
{
jed_set_fuse(data, curfuse++, 1);
jed_set_fuse(data, curfuse++, 0);
if (LOG_PARSE) printf("10");
}
break;
case '0':
if (outputs)
{
jed_set_fuse(data, curfuse++, 1);
if (LOG_PARSE) printf("1");
}
else
{
jed_set_fuse(data, curfuse++, 0);
jed_set_fuse(data, curfuse++, 1);
if (LOG_PARSE) printf("01");
}
break;
case ' ':
outputs = true;
if (LOG_PARSE) printf(" ");
break;
}
if (iscrlf(*cursrc) && outputs)
{
outputs = false;
if (LOG_PARSE) printf("\n");
}
cursrc++;
}
data->numfuses = curfuse;
break;
}
// end of file
case 'e':
printf("End of file\n");
break;
}
cursrc++;
}
/*-------------------------------------------------
pla_parse - parse a Berkeley standard PLA file
that has been loaded raw into memory
-------------------------------------------------*/
int pla_parse(const void *data, size_t length, jed_data *result)
{
const UINT8 *cursrc = (const UINT8 *)data;
const UINT8 *srcend = cursrc + length;
const UINT8 *scan;
parse_info pinfo;
result->numfuses = 0;
memset(result->fusemap, 0x00, sizeof(result->fusemap));
while (cursrc < srcend)
{
if (*cursrc == '#')
{
cursrc++;
while (cursrc < srcend && !iscrlf(*cursrc))
cursrc++;
}
else if (*cursrc == '.')
{
scan = cursrc;
while (scan < srcend && !iscrlf(*scan))
scan++;
if (scan >= srcend)
return JEDERR_INVALID_DATA;
process_field(result, cursrc, srcend, &pinfo);
cursrc = scan + 1;
}
cursrc++;
}
return JEDERR_NONE;
}
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