summaryrefslogtreecommitdiff
path: root/console-tools/loadfont.c
blob: 52605baa198ff843687ae32a75a46f43f0c4582e (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
/* vi: set sw=4 ts=4: */
/*
 * loadfont.c - Eugene Crosser & Andries Brouwer
 *
 * Version 0.96bb
 *
 * Loads the console font, and possibly the corresponding screen map(s).
 * (Adapted for busybox by Matej Vela.)
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */
//config:config LOADFONT
//config:	bool "loadfont"
//config:	default y
//config:	select PLATFORM_LINUX
//config:	help
//config:	  This program loads a console font from standard input.
//config:
//config:config SETFONT
//config:	bool "setfont"
//config:	default y
//config:	select PLATFORM_LINUX
//config:	help
//config:	  Allows to load console screen map. Useful for i18n.
//config:
//config:config FEATURE_SETFONT_TEXTUAL_MAP
//config:	bool "Support reading textual screen maps"
//config:	default y
//config:	depends on SETFONT
//config:	help
//config:	  Support reading textual screen maps.
//config:
//config:config DEFAULT_SETFONT_DIR
//config:	string "Default directory for console-tools files"
//config:	default ""
//config:	depends on SETFONT
//config:	help
//config:	  Directory to use if setfont's params are simple filenames
//config:	  (not /path/to/file or ./file). Default is "" (no default directory).
//config:
//config:comment "Common options for loadfont and setfont"
//config:	depends on LOADFONT || SETFONT
//config:
//config:config FEATURE_LOADFONT_PSF2
//config:	bool "Support for PSF2 console fonts"
//config:	default y
//config:	depends on LOADFONT || SETFONT
//config:	help
//config:	  Support PSF2 console fonts.
//config:
//config:config FEATURE_LOADFONT_RAW
//config:	bool "Support for old (raw) console fonts"
//config:	default y
//config:	depends on LOADFONT || SETFONT
//config:	help
//config:	  Support old (raw) console fonts.

//applet:IF_LOADFONT(APPLET(loadfont, BB_DIR_USR_SBIN, BB_SUID_DROP))
//applet:IF_SETFONT(APPLET(setfont, BB_DIR_USR_SBIN, BB_SUID_DROP))

//kbuild:lib-$(CONFIG_LOADFONT) += loadfont.o
//kbuild:lib-$(CONFIG_SETFONT) += loadfont.o

//usage:#define loadfont_trivial_usage
//usage:       "< font"
//usage:#define loadfont_full_usage "\n\n"
//usage:       "Load a console font from stdin"
/* //usage:     "\n	-C TTY	Affect TTY instead of /dev/tty" */
//usage:
//usage:#define loadfont_example_usage
//usage:       "$ loadfont < /etc/i18n/fontname\n"
//usage:
//usage:#define setfont_trivial_usage
//usage:       "FONT [-m MAPFILE] [-C TTY]"
//usage:#define setfont_full_usage "\n\n"
//usage:       "Load a console font\n"
//usage:     "\n	-m MAPFILE	Load console screen map"
//usage:     "\n	-C TTY		Affect TTY instead of /dev/tty"
//usage:
//usage:#define setfont_example_usage
//usage:       "$ setfont -m koi8-r /etc/i18n/fontname\n"

#include "libbb.h"
#include <sys/kd.h>

#ifndef KDFONTOP
# define KDFONTOP 0x4B72
struct console_font_op {
	unsigned op;            /* KD_FONT_OP_* */
	unsigned flags;         /* KD_FONT_FLAG_* */
	unsigned width, height;
	unsigned charcount;
	unsigned char *data;    /* font data with height fixed to 32 */
};
# define KD_FONT_OP_SET          0  /* Set font */
# define KD_FONT_OP_GET          1  /* Get font */
# define KD_FONT_OP_SET_DEFAULT  2  /* Set font to default, data points to name / NULL */
# define KD_FONT_OP_COPY         3  /* Copy from another console */
# define KD_FONT_FLAG_OLD        0x80000000 /* Invoked via old interface */
# define KD_FONT_FLAG_DONT_RECALC 1 /* Don't call adjust_height() */
                                   /* (Used internally for PIO_FONT support) */
#endif /* KDFONTOP */


enum {
	PSF1_MAGIC0 = 0x36,
	PSF1_MAGIC1 = 0x04,
	PSF1_MODE512 = 0x01,
	PSF1_MODEHASTAB = 0x02,
	PSF1_MODEHASSEQ = 0x04,
	PSF1_MAXMODE = 0x05,
	PSF1_STARTSEQ = 0xfffe,
	PSF1_SEPARATOR = 0xffff,
};

struct psf1_header {
	unsigned char magic[2];         /* Magic number */
	unsigned char mode;             /* PSF font mode */
	unsigned char charsize;         /* Character size */
};

#define psf1h(x) ((struct psf1_header*)(x))

#define PSF1_MAGIC_OK(x) ( \
     (x)->magic[0] == PSF1_MAGIC0 \
  && (x)->magic[1] == PSF1_MAGIC1 \
)

#if ENABLE_FEATURE_LOADFONT_PSF2
enum {
	PSF2_MAGIC0 = 0x72,
	PSF2_MAGIC1 = 0xb5,
	PSF2_MAGIC2 = 0x4a,
	PSF2_MAGIC3 = 0x86,
	PSF2_HAS_UNICODE_TABLE = 0x01,
	PSF2_MAXVERSION = 0,
	PSF2_STARTSEQ = 0xfe,
	PSF2_SEPARATOR = 0xff
};

struct psf2_header {
	unsigned char magic[4];
	unsigned int version;
	unsigned int headersize;    /* offset of bitmaps in file */
	unsigned int flags;
	unsigned int length;        /* number of glyphs */
	unsigned int charsize;      /* number of bytes for each character */
	unsigned int height;        /* max dimensions of glyphs */
	unsigned int width;         /* charsize = height * ((width + 7) / 8) */
};

#define psf2h(x) ((struct psf2_header*)(x))

#define PSF2_MAGIC_OK(x) ( \
     (x)->magic[0] == PSF2_MAGIC0 \
  && (x)->magic[1] == PSF2_MAGIC1 \
  && (x)->magic[2] == PSF2_MAGIC2 \
  && (x)->magic[3] == PSF2_MAGIC3 \
)
#endif /* ENABLE_FEATURE_LOADFONT_PSF2 */


static void do_loadfont(int fd, unsigned char *inbuf, int height, int width, int charsize, int fontsize)
{
	unsigned char *buf;
	int charwidth = 32 * ((width+7)/8);
	int i;

	if (height < 1 || height > 32 || width < 1 || width > 32)
		bb_error_msg_and_die("bad character size %dx%d", height, width);

	buf = xzalloc(charwidth * ((fontsize < 128) ? 128 : fontsize));
	for (i = 0; i < fontsize; i++)
		memcpy(buf + (i*charwidth), inbuf + (i*charsize), charsize);

	{ /* KDFONTOP */
		struct console_font_op cfo;
		cfo.op = KD_FONT_OP_SET;
		cfo.flags = 0;
		cfo.width = width;
		cfo.height = height;
		cfo.charcount = fontsize;
		cfo.data = buf;
		xioctl(fd, KDFONTOP, &cfo);
	}

	free(buf);
}

/*
 * Format of the Unicode information:
 *
 * For each font position <uc>*<seq>*<term>
 * where <uc> is a 2-byte little endian Unicode value (PSF1)
 * or an UTF-8 coded value (PSF2),
 * <seq> = <ss><uc><uc>*, <ss> = psf1 ? 0xFFFE : 0xFE,
 * <term> = psf1 ? 0xFFFF : 0xFF.
 * and * denotes zero or more occurrences of the preceding item.
 *
 * Semantics:
 * The leading <uc>* part gives Unicode symbols that are all
 * represented by this font position. The following sequences
 * are sequences of Unicode symbols - probably a symbol
 * together with combining accents - also represented by
 * this font position.
 *
 * Example:
 * At the font position for a capital A-ring glyph, we
 * may have:
 *   00C5,212B,FFFE,0041,030A,FFFF
 * Some font positions may be described by sequences only,
 * namely when there is no precomposed Unicode value for the glyph.
 */
#if !ENABLE_FEATURE_LOADFONT_PSF2
#define do_loadtable(fd, inbuf, tailsz, fontsize, psf2) \
	do_loadtable(fd, inbuf, tailsz, fontsize)
#endif
static void do_loadtable(int fd, unsigned char *inbuf, int tailsz, int fontsize, int psf2)
{
#if !ENABLE_FEATURE_LOADFONT_PSF2
/* gcc 4.3.1 code size: */
# define psf2 0 /* +0 bytes */
//	const int psf2 = 0; /* +8 bytes */
//	enum { psf2 = 0 }; /* +13 bytes */
#endif
	struct unimapinit advice;
	struct unimapdesc ud;
	struct unipair *up;
	int ct = 0, maxct;
	int glyph;
	uint16_t unicode;

	maxct = tailsz; /* more than enough */
	up = xmalloc(maxct * sizeof(*up));

	for (glyph = 0; glyph < fontsize; glyph++) {
		while (tailsz > 0) {
			if (!psf2) { /* PSF1 */
				unicode = (((uint16_t) inbuf[1]) << 8) + inbuf[0];
				tailsz -= 2;
				inbuf += 2;
				if (unicode == PSF1_SEPARATOR)
					break;
			} else { /* PSF2 */
#if ENABLE_FEATURE_LOADFONT_PSF2
				--tailsz;
				unicode = *inbuf++;
				if (unicode == PSF2_SEPARATOR) {
					break;
				} else if (unicode == PSF2_STARTSEQ) {
					bb_error_msg_and_die("unicode sequences not implemented");
				} else if (unicode >= 0xC0) {
					if (unicode >= 0xFC)
						unicode &= 0x01, maxct = 5;
					else if (unicode >= 0xF8)
						unicode &= 0x03, maxct = 4;
					else if (unicode >= 0xF0)
						unicode &= 0x07, maxct = 3;
					else if (unicode >= 0xE0)
						unicode &= 0x0F, maxct = 2;
					else
						unicode &= 0x1F, maxct = 1;
					do {
						if (tailsz <= 0 || *inbuf < 0x80 || *inbuf > 0xBF)
							bb_error_msg_and_die("illegal UTF-8 character");
						--tailsz;
						unicode = (unicode << 6) + (*inbuf++ & 0x3F);
					} while (--maxct > 0);
				} else if (unicode >= 0x80) {
					bb_error_msg_and_die("illegal UTF-8 character");
				}
#else
				return;
#endif
			}
			up[ct].unicode = unicode;
			up[ct].fontpos = glyph;
			ct++;
		}
	}

	/* Note: after PIO_UNIMAPCLR and before PIO_UNIMAP
	 * this printf did not work on many kernels */

	advice.advised_hashsize = 0;
	advice.advised_hashstep = 0;
	advice.advised_hashlevel = 0;
	xioctl(fd, PIO_UNIMAPCLR, &advice);
	ud.entry_ct = ct;
	ud.entries = up;
	xioctl(fd, PIO_UNIMAP, &ud);
#undef psf2
}

static void do_load(int fd, unsigned char *buffer, size_t len)
{
	int height;
	int width = 8;
	int charsize;
	int fontsize = 256;
	int has_table = 0;
	unsigned char *font = buffer;
	unsigned char *table;

	if (len >= sizeof(struct psf1_header) && PSF1_MAGIC_OK(psf1h(buffer))) {
		if (psf1h(buffer)->mode > PSF1_MAXMODE)
			bb_error_msg_and_die("unsupported psf file mode");
		if (psf1h(buffer)->mode & PSF1_MODE512)
			fontsize = 512;
		if (psf1h(buffer)->mode & PSF1_MODEHASTAB)
			has_table = 1;
		height = charsize = psf1h(buffer)->charsize;
		font += sizeof(struct psf1_header);
	} else
#if ENABLE_FEATURE_LOADFONT_PSF2
	if (len >= sizeof(struct psf2_header) && PSF2_MAGIC_OK(psf2h(buffer))) {
		if (psf2h(buffer)->version > PSF2_MAXVERSION)
			bb_error_msg_and_die("unsupported psf file version");
		fontsize = psf2h(buffer)->length;
		if (psf2h(buffer)->flags & PSF2_HAS_UNICODE_TABLE)
			has_table = 2;
		charsize = psf2h(buffer)->charsize;
		height = psf2h(buffer)->height;
		width = psf2h(buffer)->width;
		font += psf2h(buffer)->headersize;
	} else
#endif
#if ENABLE_FEATURE_LOADFONT_RAW
	if (len == 9780) {  /* file with three code pages? */
		charsize = height = 16;
		font += 40;
	} else if ((len & 0377) == 0) {  /* bare font */
		charsize = height = len / 256;
	} else
#endif
	{
		bb_error_msg_and_die("input file: bad length or unsupported font type");
	}

#if !defined(PIO_FONTX) || defined(__sparc__)
	if (fontsize != 256)
		bb_error_msg_and_die("only fontsize 256 supported");
#endif

	table = font + fontsize * charsize;
	buffer += len;

	if (table > buffer || (!has_table && table != buffer))
		bb_error_msg_and_die("input file: bad length");

	do_loadfont(fd, font, height, width, charsize, fontsize);

	if (has_table)
		do_loadtable(fd, table, buffer - table, fontsize, has_table - 1);
}


#if ENABLE_LOADFONT
int loadfont_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int loadfont_main(int argc UNUSED_PARAM, char **argv)
{
	size_t len;
	unsigned char *buffer;

	// no arguments allowed!
	opt_complementary = "=0";
	getopt32(argv, "");

	/*
	 * We used to look at the length of the input file
	 * with stat(); now that we accept compressed files,
	 * just read the entire file.
	 * Len was 32k, but latarcyrheb-sun32.psfu is 34377 bytes
	 * (it has largish Unicode map).
	 */
	len = 128*1024;
	buffer = xmalloc_read(STDIN_FILENO, &len);
	// xmalloc_open_zipped_read_close(filename, &len);
	if (!buffer)
		bb_perror_msg_and_die("error reading input font");
	do_load(get_console_fd_or_die(), buffer, len);

	return EXIT_SUCCESS;
}
#endif

#if ENABLE_SETFONT

/*
kbd-1.12:

setfont [-O font+umap.orig] [-o font.orig] [-om cmap.orig]
[-ou umap.orig] [-N] [font.new ...] [-m cmap] [-u umap] [-C console]
[-hNN] [-v] [-V]

-h NN  Override font height
-o file
       Save previous font in file
-O file
       Save previous font and Unicode map in file
-om file
       Store console map in file
-ou file
       Save previous Unicode map in file
-m file
       Load console map or Unicode console map from file
-u file
       Load Unicode table describing the font from file
       Example:
       # cp866
       0x00-0x7f       idem
       #
       0x80    U+0410  # CYRILLIC CAPITAL LETTER A
       0x81    U+0411  # CYRILLIC CAPITAL LETTER BE
       0x82    U+0412  # CYRILLIC CAPITAL LETTER VE
-C console
       Set the font for the indicated console
-v     Verbose
-V     Version
*/

#if ENABLE_FEATURE_SETFONT_TEXTUAL_MAP
static int ctoi(char *s)
{
	if (s[0] == '\'' && s[1] != '\0' && s[2] == '\'' && s[3] == '\0')
		return s[1];
	// U+ means 0x
	if (s[0] == 'U' && s[1] == '+') {
		s[0] = '0';
		s[1] = 'x';
	}
	if (!isdigit(s[0]))
		return -1;
	return xstrtoul(s, 0);
}
#endif

int setfont_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int setfont_main(int argc UNUSED_PARAM, char **argv)
{
	size_t len;
	unsigned opts;
	int fd;
	unsigned char *buffer;
	char *mapfilename;
	const char *tty_name = CURRENT_TTY;

	opt_complementary = "=1";
	opts = getopt32(argv, "m:C:", &mapfilename, &tty_name);
	argv += optind;

	fd = xopen_nonblocking(tty_name);

	if (sizeof(CONFIG_DEFAULT_SETFONT_DIR) > 1) { // if not ""
		if (*argv[0] != '/') {
			// goto default fonts location. don't die if doesn't exist
			chdir(CONFIG_DEFAULT_SETFONT_DIR "/consolefonts");
		}
	}
	// load font
	len = 128*1024;
	buffer = xmalloc_open_zipped_read_close(*argv, &len);
	if (!buffer)
		bb_simple_perror_msg_and_die(*argv);
	do_load(fd, buffer, len);

	// load the screen map, if any
	if (opts & 1) { // -m
		unsigned mode = PIO_SCRNMAP;
		void *map;

		if (sizeof(CONFIG_DEFAULT_SETFONT_DIR) > 1) { // if not ""
			if (mapfilename[0] != '/') {
				// goto default keymaps location
				chdir(CONFIG_DEFAULT_SETFONT_DIR "/consoletrans");
			}
		}
		// fetch keymap
		map = xmalloc_open_zipped_read_close(mapfilename, &len);
		if (!map)
			bb_simple_perror_msg_and_die(mapfilename);
		// file size is 256 or 512 bytes? -> assume binary map
		if (len == E_TABSZ || len == 2*E_TABSZ) {
			if (len == 2*E_TABSZ)
				mode = PIO_UNISCRNMAP;
		}
#if ENABLE_FEATURE_SETFONT_TEXTUAL_MAP
		// assume textual Unicode console maps:
		// 0x00 U+0000  #  NULL (NUL)
		// 0x01 U+0001  #  START OF HEADING (SOH)
		// 0x02 U+0002  #  START OF TEXT (STX)
		// 0x03 U+0003  #  END OF TEXT (ETX)
		else {
			int i;
			char *token[2];
			parser_t *parser;

			if (ENABLE_FEATURE_CLEAN_UP)
				free(map);
			map = xmalloc(E_TABSZ * sizeof(unsigned short));

#define unicodes ((unsigned short *)map)
			// fill vanilla map
			for (i = 0; i < E_TABSZ; i++)
				unicodes[i] = 0xf000 + i;

			parser = config_open(mapfilename);
			while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
				// parse code/value pair
				int a = ctoi(token[0]);
				int b = ctoi(token[1]);
				if (a < 0 || a >= E_TABSZ
				 || b < 0 || b > 65535
				) {
					bb_error_msg_and_die("map format");
				}
				// patch map
				unicodes[a] = b;
				// unicode character is met?
				if (b > 255)
					mode = PIO_UNISCRNMAP;
			}
			if (ENABLE_FEATURE_CLEAN_UP)
				config_close(parser);

			if (mode != PIO_UNISCRNMAP) {
#define asciis ((unsigned char *)map)
				for (i = 0; i < E_TABSZ; i++)
					asciis[i] = unicodes[i];
#undef asciis
			}
#undef unicodes
		}
#endif // ENABLE_FEATURE_SETFONT_TEXTUAL_MAP

		// do set screen map
		xioctl(fd, mode, map);

		if (ENABLE_FEATURE_CLEAN_UP)
			free(map);
	}

	return EXIT_SUCCESS;
}
#endif