summaryrefslogtreecommitdiffstatshomepage
path: root/src/lib/util/jedparse.c
blob: 24698acd5fd0f0a74d54778c130410072eb1f82b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
/***************************************************************************

    jedparse.c

    Parser for .JED 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.

****************************************************************************

    Binary file format:

    Offset
        0 = Total number of fuses (32 bits)
        4 = Raw fuse data, packed 8 bits at a time, LSB to MSB

***************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "jedparse.h"



/***************************************************************************
    DEBUGGING
***************************************************************************/

#define LOG_PARSE		0



/***************************************************************************
    TYPE DEFINITIONS
***************************************************************************/

typedef struct _parse_info parse_info;
struct _parse_info
{
	UINT16		checksum;				/* checksum value */
	UINT32		explicit_numfuses;		/* explicitly specified number of fuses */
};



/***************************************************************************
    UTILITIES
***************************************************************************/

/*-------------------------------------------------
    ishex - is a character a valid hex digit?
-------------------------------------------------*/

static int ishex(char c)
{
	return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F');
}



/*-------------------------------------------------
    hexval - the hex value of a given character
-------------------------------------------------*/

static int hexval(char c)
{
	return (c >= '0' && c <= '9') ? (c - '0') : (10 + c - 'A');
}



/*-------------------------------------------------
    isdelim - is a character a JEDEC delimiter?
-------------------------------------------------*/

static int isdelim(char c)
{
	return (c == ' ' || 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;

	/* skip delimiters */
	while (isdelim(*src))
		src++;

	/* 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 JEDEC field
-------------------------------------------------*/

static void process_field(jed_data *data, const UINT8 *cursrc, const UINT8 *srcend, parse_info *pinfo)
{
	/* switch off of the field type */
	switch (*cursrc)
	{
		case 'Q':
			cursrc++;
			switch (*cursrc)
			{
				/* number of fuses */
				case 'F':
					cursrc++;
					pinfo->explicit_numfuses = data->numfuses = suck_number(&cursrc);
					break;
			}
			break;

		/* default fuse state (0 or 1) */
		case 'F':
			cursrc++;
			if (LOG_PARSE) printf("F%c\n", *cursrc);
			if (*cursrc == '0')
				memset(data->fusemap, 0x00, sizeof(data->fusemap));
			else
				memset(data->fusemap, 0xff, sizeof(data->fusemap));
			break;

		/* fuse states */
		case 'L':
		{
			UINT32 curfuse;

			/* read the fuse number */
			cursrc++;
			curfuse = suck_number(&cursrc);
			if (LOG_PARSE) printf("L%d\n", curfuse);

			/* read digits, skipping delimiters */
			for ( ; cursrc < srcend; cursrc++)
				if (*cursrc == '0' || *cursrc == '1')
				{
					jed_set_fuse(data, curfuse, *cursrc - '0');
					if (LOG_PARSE) printf("  fuse %d = %d\n", curfuse, 0);
					if (curfuse >= data->numfuses)
						data->numfuses = curfuse + 1;
					curfuse++;
				}
			break;
		}

		/* fuse checksum */
		case 'C':
			cursrc++;
			if (cursrc < srcend + 4 && ishex(cursrc[0]) && ishex(cursrc[1]) && ishex(cursrc[2]) && ishex(cursrc[3]))
			{
				pinfo->checksum = 0;
				while (ishex(*cursrc) && cursrc < srcend)
					pinfo->checksum = (pinfo->checksum << 4) | hexval(*cursrc++);
			}
			break;
	}
}



/*-------------------------------------------------
    jed_parse - parse a .JED file that has been
    loaded raw into memory
-------------------------------------------------*/

int jed_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;
	UINT16 checksum;
	int i;

	/* initialize the output and the intermediate info struct */
	memset(result, 0, sizeof(*result));
	memset(&pinfo, 0, sizeof(pinfo));

	/* first scan for the STX character; ignore anything prior */
	while (cursrc < srcend && *cursrc != 0x02)
		cursrc++;
	if (cursrc >= srcend)
		return JEDERR_INVALID_DATA;

	/* then scan to see if we have an ETX */
	scan = cursrc;
	checksum = 0;
	while (scan < srcend && *scan != 0x03)
		checksum += *scan++ & 0x7f;
	if (scan >= srcend)
		return JEDERR_INVALID_DATA;

	/* see if there is a transmission checksum at the end */
	checksum += *scan;
	if (scan + 4 < srcend && ishex(scan[1]) && ishex(scan[2]) && ishex(scan[3]) && ishex(scan[4]))
	{
		UINT16 dessum = (hexval(scan[1]) << 12) | (hexval(scan[2]) << 8) | (hexval(scan[3]) << 4) | hexval(scan[4] << 0);
		if (dessum != 0 && dessum != checksum)
			return JEDERR_BAD_XMIT_SUM;
	}

	/* the ETX becomes the real srcend */
	srcend = scan;

	/* blast through the comment field */
	cursrc++;
	while (cursrc < srcend && *cursrc != '*')
		cursrc++;

	/* now loop over fields and decide which ones go in the file output */
	cursrc++;
	while (cursrc < srcend)
	{
		/* skip over delimiters */
		while (cursrc < srcend && isdelim(*cursrc))
			cursrc++;
		if (cursrc >= srcend)
			break;

		/* end of field is an asterisk -- find it */
		scan = cursrc;
		while (scan < srcend && *scan != '*')
			scan++;
		if (scan >= srcend)
			return JEDERR_INVALID_DATA;

		/* process the field */
		process_field(result, cursrc, scan, &pinfo);

		/* advance past it */
		cursrc = scan + 1;
	}

	/* if we got an explicit fuse count, override our computed count */
	if (pinfo.explicit_numfuses != 0)
		result->numfuses = pinfo.explicit_numfuses;

	/* clear out leftover bits */
	if (result->numfuses % 8 != 0)
		result->fusemap[result->numfuses / 8] &= (1 << (result->numfuses % 8)) - 1;
	memset(&result->fusemap[(result->numfuses + 7) / 8], 0, sizeof(result->fusemap) - (result->numfuses + 7) / 8);

	/* validate the checksum */
	checksum = 0;
	for (i = 0; i < (result->numfuses + 7) / 8; i++)
		checksum += result->fusemap[i];
	if (pinfo.checksum != 0 && checksum != pinfo.checksum)
		return JEDERR_BAD_FUSE_SUM;

	return JEDERR_NONE;
}



/*-------------------------------------------------
    jed_output - generate a new .JED file based
    on the jed_data provided
-------------------------------------------------*/

size_t jed_output(const jed_data *data, void *result, size_t length)
{
	UINT8 *curdst = (UINT8 *)result;
	UINT8 *dstend = curdst + length;
	int i, zeros, ones;
	char tempbuf[256];
	UINT16 checksum;
	UINT8 defbyte;
	UINT8 *temp;

	/* always start the DST with a standard header and an STX */
	tempbuf[0] = 0x02;
	sprintf(&tempbuf[1], "JEDEC file generated by jedutil*\n");
	if (curdst + strlen(tempbuf) <= dstend)
		memcpy(curdst, tempbuf, strlen(tempbuf));
	curdst += strlen(tempbuf);

	/* append the package information */
	sprintf(tempbuf, "QF%d*\n", data->numfuses);
	if (curdst + strlen(tempbuf) <= dstend)
		memcpy(curdst, tempbuf, strlen(tempbuf));
	curdst += strlen(tempbuf);

	/* compute the checksum */
	checksum = 0;
	for (i = 0; i < data->numfuses / 8; i++)
		checksum += data->fusemap[i];
	if (data->numfuses % 8 != 0)
		checksum += data->fusemap[data->numfuses / 8] & ((1 << (data->numfuses % 8)) - 1);

	/* determine if we are mostly 0's or mostly 1's */
	for (i = zeros = ones = 0; i < data->numfuses / 8; i++)
		if (data->fusemap[i] == 0x00)
			zeros++;
		else if (data->fusemap[i] == 0xff)
			ones++;
	defbyte = (ones > zeros) ? 0xff : 0x00;

	/* output the default fuse state */
	sprintf(tempbuf, "F%d*\n", defbyte & 1);
	if (curdst + strlen(tempbuf) <= dstend)
		memcpy(curdst, tempbuf, strlen(tempbuf));
	curdst += strlen(tempbuf);

	/* now loop over groups of 32 fuses and output non-default groups */
	for (i = 0; i < data->numfuses; i += 32)
		if (data->fusemap[i / 8 + 0] != defbyte ||
			data->fusemap[i / 8 + 1] != defbyte ||
			data->fusemap[i / 8 + 2] != defbyte ||
			data->fusemap[i / 8 + 3] != defbyte)
		{
			int stroffs;
			int j;

			/* build up a string of 32 fuses */
			stroffs = sprintf(tempbuf, "L%05d ", i);
			for (j = 0; j < 32 && i+j < data->numfuses; j++)
				tempbuf[stroffs++] = '0' + jed_get_fuse(data, i + j);
			stroffs += sprintf(&tempbuf[stroffs], "*\n");

			/* append to the buffer */
			if (curdst + strlen(tempbuf) <= dstend)
				memcpy(curdst, tempbuf, strlen(tempbuf));
			curdst += strlen(tempbuf);
		}

	/* write the checksum */
	sprintf(tempbuf, "C%04X*\n", checksum);
	if (curdst + strlen(tempbuf) <= dstend)
		memcpy(curdst, tempbuf, strlen(tempbuf));
	curdst += strlen(tempbuf);

	/* now compute the transmission checksum */
	checksum = 0;
	for (temp = (UINT8 *)result; temp < curdst && temp < dstend; temp++)
		checksum += *temp & 0x7f;
	checksum += 0x03;

	/* append the ETX and the transmission checksum */
	tempbuf[0] = 0x03;
	sprintf(&tempbuf[1], "%04X", checksum);
	if (curdst + strlen(tempbuf) <= dstend)
		memcpy(curdst, tempbuf, strlen(tempbuf));
	curdst += strlen(tempbuf);

	/* return the final size */
	return curdst - (UINT8 *)result;
}



/*-------------------------------------------------
    jedbin_parse - parse a binary JED file that
    has been loaded raw into memory
-------------------------------------------------*/

int jedbin_parse(const void *data, size_t length, jed_data *result)
{
	const UINT8 *cursrc = (const UINT8 *)data;

	/* initialize the output */
	memset(result, 0, sizeof(*result));

	/* need at least 4 bytes */
	if (length < 4)
		return JEDERR_INVALID_DATA;

	/* first unpack the number of fuses */
	result->numfuses = (cursrc[0] << 24) | (cursrc[1] << 16) | (cursrc[2] << 8) | cursrc[3];
	cursrc += 4;
	if (result->numfuses == 0 || result->numfuses > JED_MAX_FUSES)
		return JEDERR_INVALID_DATA;

	/* now make sure we have enough data in the source */
	if (length < 4 + (result->numfuses + 7) / 8)
		return JEDERR_INVALID_DATA;

	/* copy in the data */
	memcpy(result->fusemap, cursrc, (result->numfuses + 7) / 8);
	return JEDERR_NONE;
}



/*-------------------------------------------------
    jedbin_output - generate a new binary JED file
    based on the jed_data provided
-------------------------------------------------*/

size_t jedbin_output(const jed_data *data, void *result, size_t length)
{
	UINT8 *curdst = (UINT8 *)result;

	/* ensure we have enough room */
	if (length >= 4 + (data->numfuses + 7) / 8)
	{
		/* store the number of fuses */
		*curdst++ = data->numfuses >> 24;
		*curdst++ = data->numfuses >> 16;
		*curdst++ = data->numfuses >> 8;
		*curdst++ = data->numfuses >> 0;

		/* copy in the rest of the data */
		memcpy(curdst, data->fusemap, (data->numfuses + 7) / 8);
	}

	/* return the final size */
	return 4 + (data->numfuses + 7) / 8;
}