summaryrefslogtreecommitdiff
path: root/source3/utils/regedit_hexedit.c
blob: d70c521fa67a6c5cbb2a4fc0b351b895e59cbdb1 (plain)
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
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
/*
 * Samba Unix/Linux SMB client library
 * Registry Editor
 * Copyright (C) Christopher Davis 2012
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "includes.h"
#include "regedit_hexedit.h"

/*
 offset    hex1         hex2         ascii
 00000000  FF FF FF FF  FF FF FF FF  ........
*/

#define HEX_COL1 10
#define HEX_COL1_END 21
#define HEX_COL2 23
#define HEX_COL2_END 34
#define ASCII_COL 36
#define ASCII_COL_END LINE_WIDTH
#define BYTES_PER_LINE 8

struct hexedit {
	size_t offset;
	size_t len;
	size_t alloc_size;
	int cursor_y;
	int cursor_x;
	size_t cursor_offset;
	size_t cursor_line_offset;
	int nibble;
	uint8_t *data;
	WINDOW *win;
};

static int max_rows(WINDOW *win)
{
	int maxy;

	maxy = getmaxy(win);

	return maxy - 1;
}

struct hexedit *hexedit_new(TALLOC_CTX *ctx, WINDOW *parent, const void *data,
			    size_t sz)
{
	WERROR rv;
	struct hexedit *buf;

	buf = talloc_zero(ctx, struct hexedit);
	if (buf == NULL) {
		return NULL;
	}

	buf->win = parent;

	rv = hexedit_set_buf(buf, data, sz);
	if (!W_ERROR_IS_OK(rv)) {
		goto fail;
	}

	return buf;

fail:
	talloc_free(buf);

	return NULL;
}

WERROR hexedit_set_buf(struct hexedit *buf, const void *data, size_t sz)
{
	TALLOC_FREE(buf->data);

	buf->data = talloc_zero_array(buf, uint8_t, sz);
	if (buf->data == NULL) {
		return WERR_NOMEM;
	}

	if (data != NULL) {
		memcpy(buf->data, data, sz);
	}

	buf->len = sz;
	buf->alloc_size = sz;
	buf->cursor_x = HEX_COL1;
	buf->cursor_y = 0;
	buf->cursor_offset = 0;
	buf->cursor_line_offset = 0;
	buf->nibble = 0;

	return WERR_OK;
}

const void *hexedit_get_buf(struct hexedit *buf)
{
	return buf->data;
}

size_t hexedit_get_buf_len(struct hexedit *buf)
{
	return buf->len;
}

static size_t bytes_per_screen(WINDOW *win)
{
	return max_rows(win) * BYTES_PER_LINE;
}

void hexedit_set_cursor(struct hexedit *buf)
{
	wmove(buf->win, max_rows(buf->win), 0);
	wattron(buf->win, A_REVERSE | A_STANDOUT);
	wclrtoeol(buf->win);
	if (buf->cursor_offset < buf->len) {
		wprintw(buf->win, "Len:%lu Off:%lu Val:0x%X", buf->len,
			buf->cursor_offset, buf->data[buf->cursor_offset]);
	} else {
		wprintw(buf->win, "Len:%lu Off:%lu", buf->len,
			buf->cursor_offset);
	}
	wattroff(buf->win, A_REVERSE | A_STANDOUT);
	wmove(buf->win, buf->cursor_y, buf->cursor_x);
	wcursyncup(buf->win);
	wsyncup(buf->win);
	untouchwin(buf->win);
}

void hexedit_refresh(struct hexedit *buf)
{
	size_t end;
	size_t lineno;
	size_t off;

	werase(buf->win);
	if (buf->len == 0) {
		mvwprintw(buf->win, 0, 0, "%08X", 0);
		return;
	}

	end = buf->offset + bytes_per_screen(buf->win);
	if (end > buf->len) {
		end = buf->len;
	}

	for (off = buf->offset, lineno = 0;
	     off < end;
	     off += BYTES_PER_LINE, ++lineno) {
		uint8_t *line = buf->data + off;
		size_t i, endline;

		wmove(buf->win, lineno, 0);
		wprintw(buf->win, "%08X  ", off);

		endline = BYTES_PER_LINE;

		if (off + BYTES_PER_LINE > buf->len) {
			endline = buf->len - off;
		}

		for (i = 0; i < endline; ++i) {
			wprintw(buf->win, "%02X", line[i]);
			if (i + 1 < endline) {
				if (i == 3) {
					wprintw(buf->win, "  ");
				} else {
					wprintw(buf->win, " ");
				}
			}
		}

		wmove(buf->win, lineno, ASCII_COL);
		for (i = 0; i < endline; ++i) {
			if (isprint(line[i])) {
				waddch(buf->win, line[i]);
			} else {
				waddch(buf->win, '.');
			}
		}
	}
}

static void calc_cursor_offset(struct hexedit *buf)
{
	buf->cursor_offset = buf->offset + buf->cursor_y * BYTES_PER_LINE +
				buf->cursor_line_offset;
}

static int offset_to_hex_col(size_t pos)
{
	switch (pos) {
	case 0:
		return HEX_COL1;
	case 1:
		return HEX_COL1 + 3;
	case 2:
		return HEX_COL1 + 6;
	case 3:
		return HEX_COL1 + 9;

	case 4:
		return HEX_COL2;
	case 5:
		return HEX_COL2 + 3;
	case 6:
		return HEX_COL2 + 6;
	case 7:
		return HEX_COL2 + 9;
	}

	return -1;
}

static bool scroll_up(struct hexedit *buf)
{
	if (buf->offset == 0) {
		return false;
	}

	buf->offset -= BYTES_PER_LINE;

	return true;
}

static void cursor_down(struct hexedit *buf)
{
	size_t space;
	bool need_refresh = false;

	space = buf->offset + (buf->cursor_y + 1) * BYTES_PER_LINE;
	if (space > buf->len) {
		return;
	}

	if (buf->cursor_y + 1 == max_rows(buf->win)) {
		buf->offset += BYTES_PER_LINE;
		need_refresh = true;
	} else {
		buf->cursor_y++;
	}

	if (buf->cursor_offset + BYTES_PER_LINE > buf->len) {
		buf->nibble = 0;
		buf->cursor_offset = buf->len;
		buf->cursor_line_offset = buf->len - space;
		if (buf->cursor_x >= ASCII_COL) {
			buf->cursor_x = ASCII_COL + buf->cursor_line_offset;
		} else {
			buf->cursor_x = offset_to_hex_col(buf->cursor_line_offset);
		}
	}
	if (need_refresh) {
		hexedit_refresh(buf);
	}
	calc_cursor_offset(buf);
}

static void cursor_up(struct hexedit *buf)
{
	if (buf->cursor_y == 0) {
		if (scroll_up(buf)) {
			hexedit_refresh(buf);
		}
	} else {
		buf->cursor_y--;
	}

	calc_cursor_offset(buf);
}

static bool is_over_gap(struct hexedit *buf)
{
	int col;

	if (buf->cursor_x < ASCII_COL) {
		if (buf->cursor_x >= HEX_COL2) {
			col = buf->cursor_x - HEX_COL2;
		} else {
			col = buf->cursor_x - HEX_COL1;
		}

		switch (col) {
		case 2:
		case 5:
		case 8:
			return true;
		}
	}

	return false;
}

static void cursor_left(struct hexedit *buf)
{
	if (buf->cursor_x == HEX_COL1) {
		return;
	}
	if (buf->cursor_x == HEX_COL2) {
		buf->cursor_x = HEX_COL1_END - 1;
		buf->cursor_line_offset = 3;
		buf->nibble = 1;
	} else if (buf->cursor_x == ASCII_COL) {
		size_t off = buf->offset + buf->cursor_y * BYTES_PER_LINE;
		if (off + 7 >= buf->len) {
			size_t lastpos = buf->len - off;
			buf->cursor_x = offset_to_hex_col(lastpos) + 1;
			buf->cursor_line_offset = lastpos;
		} else {
			buf->cursor_x = HEX_COL2_END - 1;
			buf->cursor_line_offset = 7;
		}
		buf->nibble = 1;
	} else {
		if (buf->cursor_x > ASCII_COL || buf->nibble == 0) {
			buf->cursor_line_offset--;
		}
		buf->cursor_x--;
		buf->nibble = !buf->nibble;
	}

	if (is_over_gap(buf)) {
		buf->cursor_x--;
	}

	calc_cursor_offset(buf);
}

static void cursor_right(struct hexedit *buf)
{
	int new_x = buf->cursor_x + 1;

	if (new_x == ASCII_COL_END) {
		return;
	}
	if ((buf->cursor_x >= ASCII_COL || buf->nibble == 1) &&
	    buf->cursor_offset == buf->len) {
		if (buf->cursor_x < ASCII_COL) {
			new_x = ASCII_COL;
			buf->cursor_line_offset = 0;
			buf->nibble = 0;
		} else {
			return;
		}
	}
	if (new_x == HEX_COL1_END) {
		new_x = HEX_COL2;
		buf->cursor_line_offset = 4;
		buf->nibble = 0;
	} else if (new_x == HEX_COL2_END) {
		new_x = ASCII_COL;
		buf->cursor_line_offset = 0;
		buf->nibble = 0;
	} else {
		if (buf->cursor_x >= ASCII_COL || buf->nibble == 1) {
			buf->cursor_line_offset++;
		}
		buf->nibble = !buf->nibble;
	}

	buf->cursor_x = new_x;

	if (is_over_gap(buf)) {
		buf->cursor_x++;
	}

	calc_cursor_offset(buf);
}

static void do_edit(struct hexedit *buf, int c)
{
	uint8_t *byte;

	if (buf->cursor_offset == buf->len) {
		hexedit_resize_buffer(buf, buf->len + 1);
	}

	byte = buf->data + buf->cursor_offset;

	if (buf->cursor_x >= ASCII_COL) {
		*byte = (uint8_t)c;

		mvwprintw(buf->win, buf->cursor_y,
			  offset_to_hex_col(buf->cursor_line_offset), "%X", c);
		if (!isprint(c)) {
			c = '.';
		}
		mvwaddch(buf->win, buf->cursor_y,
			 ASCII_COL + buf->cursor_line_offset, c);
		if (buf->cursor_x + 1 != ASCII_COL_END) {
			cursor_right(buf);
		} else {
			cursor_down(buf);
		}
	} else {
		if (!isxdigit(c)) {
			return;
		}
		c = toupper(c);
		waddch(buf->win, c);

		if (isdigit(c)) {
			c = c - '0';
		} else {
			c = c - 'A' + 10;
		}
		if (buf->nibble == 0) {
			*byte = (*byte & 0x0f) | c << 4;
		} else {
			*byte = (*byte & 0xf0) | c;
		}

		c = *byte;
		if (!isprint(c)) {
			c = '.';
		}
		mvwaddch(buf->win, buf->cursor_y,
			 ASCII_COL + buf->cursor_line_offset, c);

		if (buf->cursor_x + 1 != HEX_COL2_END) {
			cursor_right(buf);
		} else {
			cursor_down(buf);
		}
	}

	hexedit_refresh(buf);
}

static void erase_at(struct hexedit *buf, size_t pos)
{
	if (pos >= buf->len) {
		return;
	}

	if (pos < buf->len - 1) {
		/* squeeze the character out of the buffer */
		uint8_t *p = buf->data + pos;
		uint8_t *end = buf->data + buf->len;
		memmove(p, p + 1, end - p - 1);
	}

	buf->len--;
	hexedit_refresh(buf);
}

static void do_backspace(struct hexedit *buf)
{
	size_t off;
	bool do_erase = true;

	if (buf->cursor_offset == 0) {
		return;
	}

	off = buf->cursor_offset;
	if (buf->cursor_x == ASCII_COL) {
		cursor_up(buf);
		buf->cursor_line_offset = 7;
		buf->cursor_x = ASCII_COL_END - 1;
		calc_cursor_offset(buf);
	} else if (buf->cursor_x == HEX_COL1) {
		cursor_up(buf);
		buf->cursor_line_offset = 7;
		buf->cursor_x = HEX_COL2_END - 1;
		buf->nibble = 1;
		calc_cursor_offset(buf);
	} else {
		if (buf->cursor_x < ASCII_COL && buf->nibble) {
			do_erase = false;
		}
		cursor_left(buf);
	}
	if (do_erase) {
		erase_at(buf, off - 1);
	}
}

static void do_delete(struct hexedit *buf)
{
	erase_at(buf, buf->cursor_offset);
}

void hexedit_driver(struct hexedit *buf, int c)
{
	switch (c) {
	case HE_CURSOR_UP:
		cursor_up(buf);
		break;
	case HE_CURSOR_DOWN:
		cursor_down(buf);
		break;
	case HE_CURSOR_LEFT:
		cursor_left(buf);
		break;
	case HE_CURSOR_RIGHT:
		cursor_right(buf);
		break;
	case HE_CURSOR_PGUP:
		break;
	case HE_CURSOR_PGDN:
		break;
	case HE_BACKSPACE:
		do_backspace(buf);
		break;
	case HE_DELETE:
		do_delete(buf);
		break;
	default:
		do_edit(buf, c & 0xff);
		break;
	}

	hexedit_set_cursor(buf);
}

WERROR hexedit_resize_buffer(struct hexedit *buf, size_t newsz)
{
	/* reset the cursor if it'll be out of bounds
	   after the resize */
	if (buf->cursor_offset > newsz) {
		buf->cursor_y = 0;
		buf->cursor_x = HEX_COL1;
		buf->offset = 0;
		buf->cursor_offset = 0;
		buf->cursor_line_offset = 0;
		buf->nibble = 0;
	}

	if (newsz > buf->len) {
		if (newsz > buf->alloc_size) {
			uint8_t *d;
			buf->alloc_size *= 2;
			if (newsz > buf->alloc_size) {
				buf->alloc_size = newsz;
			}
			d = talloc_realloc(buf, buf->data, uint8_t,
					   buf->alloc_size);
			if (d == NULL) {
				return WERR_NOMEM;
			}
			buf->data = d;
		}
		memset(buf->data + buf->len, '\0', newsz - buf->len);
		buf->len = newsz;
	} else {
		buf->len = newsz;
	}

	return WERR_OK;
}