1 /* vi: set sw=4 ts=4: */
2 /*
3 * loadfont.c - Eugene Crosser & Andries Brouwer
4 *
5 * Version 0.96bb
6 *
7 * Loads the console font, and possibly the corresponding screen map(s).
8 * (Adapted for busybox by Matej Vela.)
9 *
10 * Licensed under GPLv2, see file LICENSE in this source tree.
11 */
12 //config:config LOADFONT
13 //config: bool "loadfont (5.2 kb)"
14 //config: default y
15 //config: help
16 //config: This program loads a console font from standard input.
17 //config:
18 //config:config SETFONT
19 //config: bool "setfont (24 kb)"
20 //config: default y
21 //config: help
22 //config: Allows to load console screen map. Useful for i18n.
23 //config:
24 //config:config FEATURE_SETFONT_TEXTUAL_MAP
25 //config: bool "Support reading textual screen maps"
26 //config: default y
27 //config: depends on SETFONT
28 //config: help
29 //config: Support reading textual screen maps.
30 //config:
31 //config:config DEFAULT_SETFONT_DIR
32 //config: string "Default directory for console-tools files"
33 //config: default ""
34 //config: depends on SETFONT
35 //config: help
36 //config: Directory to use if setfont's params are simple filenames
37 //config: (not /path/to/file or ./file). Default is "" (no default directory).
38 //config:
39 //config:comment "Common options for loadfont and setfont"
40 //config: depends on LOADFONT || SETFONT
41 //config:
42 //config:config FEATURE_LOADFONT_PSF2
43 //config: bool "Support PSF2 console fonts"
44 //config: default y
45 //config: depends on LOADFONT || SETFONT
46 //config:
47 //config:config FEATURE_LOADFONT_RAW
48 //config: bool "Support old (raw) console fonts"
49 //config: default y
50 //config: depends on LOADFONT || SETFONT
51
52 //applet:IF_LOADFONT(APPLET_NOEXEC(loadfont, loadfont, BB_DIR_USR_SBIN, BB_SUID_DROP, loadfont))
53 //applet:IF_SETFONT(APPLET_NOEXEC(setfont, setfont, BB_DIR_USR_SBIN, BB_SUID_DROP, setfont))
54
55 //kbuild:lib-$(CONFIG_LOADFONT) += loadfont.o
56 //kbuild:lib-$(CONFIG_SETFONT) += loadfont.o
57
58 #include "libbb.h"
59 #include <sys/kd.h>
60
61 #ifndef KDFONTOP
62 # define KDFONTOP 0x4B72
63 struct console_font_op {
64 unsigned op; /* KD_FONT_OP_* */
65 unsigned flags; /* KD_FONT_FLAG_* */
66 unsigned width, height;
67 unsigned charcount;
68 unsigned char *data; /* font data with height fixed to 32 */
69 };
70 # define KD_FONT_OP_SET 0 /* Set font */
71 # define KD_FONT_OP_GET 1 /* Get font */
72 # define KD_FONT_OP_SET_DEFAULT 2 /* Set font to default, data points to name / NULL */
73 # define KD_FONT_OP_COPY 3 /* Copy from another console */
74 # define KD_FONT_FLAG_OLD 0x80000000 /* Invoked via old interface */
75 # define KD_FONT_FLAG_DONT_RECALC 1 /* Don't call adjust_height() */
76 /* (Used internally for PIO_FONT support) */
77 #endif /* KDFONTOP */
78
79
80 enum {
81 PSF1_MAGIC0 = 0x36,
82 PSF1_MAGIC1 = 0x04,
83 PSF1_MODE512 = 0x01,
84 PSF1_MODEHASTAB = 0x02,
85 PSF1_MODEHASSEQ = 0x04,
86 PSF1_MAXMODE = 0x05,
87 PSF1_STARTSEQ = 0xfffe,
88 PSF1_SEPARATOR = 0xffff,
89 };
90
91 struct psf1_header {
92 unsigned char magic[2]; /* Magic number */
93 unsigned char mode; /* PSF font mode */
94 unsigned char charsize; /* Character size */
95 };
96
97 #define psf1h(x) ((struct psf1_header*)(x))
98
99 #define PSF1_MAGIC_OK(x) ( \
100 (x)->magic[0] == PSF1_MAGIC0 \
101 && (x)->magic[1] == PSF1_MAGIC1 \
102 )
103
104 #if ENABLE_FEATURE_LOADFONT_PSF2
105 enum {
106 PSF2_MAGIC0 = 0x72,
107 PSF2_MAGIC1 = 0xb5,
108 PSF2_MAGIC2 = 0x4a,
109 PSF2_MAGIC3 = 0x86,
110 PSF2_HAS_UNICODE_TABLE = 0x01,
111 PSF2_MAXVERSION = 0,
112 PSF2_STARTSEQ = 0xfe,
113 PSF2_SEPARATOR = 0xff
114 };
115
116 struct psf2_header {
117 unsigned char magic[4];
118 unsigned int version;
119 unsigned int headersize; /* offset of bitmaps in file */
120 unsigned int flags;
121 unsigned int length; /* number of glyphs */
122 unsigned int charsize; /* number of bytes for each character */
123 unsigned int height; /* max dimensions of glyphs */
124 unsigned int width; /* charsize = height * ((width + 7) / 8) */
125 };
126
127 #define psf2h(x) ((struct psf2_header*)(x))
128
129 #define PSF2_MAGIC_OK(x) ( \
130 (x)->magic[0] == PSF2_MAGIC0 \
131 && (x)->magic[1] == PSF2_MAGIC1 \
132 && (x)->magic[2] == PSF2_MAGIC2 \
133 && (x)->magic[3] == PSF2_MAGIC3 \
134 )
135 #endif /* ENABLE_FEATURE_LOADFONT_PSF2 */
136
137
do_loadfont(int fd,unsigned char * inbuf,int height,int width,int charsize,int fontsize)138 static void do_loadfont(int fd, unsigned char *inbuf, int height, int width, int charsize, int fontsize)
139 {
140 unsigned char *buf;
141 int charwidth = 32 * ((width+7)/8);
142 int i;
143
144 if (height < 1 || height > 32 || width < 1 || width > 32)
145 bb_error_msg_and_die("bad character size %dx%d", height, width);
146
147 buf = xzalloc(charwidth * ((fontsize < 128) ? 128 : fontsize));
148 for (i = 0; i < fontsize; i++)
149 memcpy(buf + (i*charwidth), inbuf + (i*charsize), charsize);
150
151 { /* KDFONTOP */
152 struct console_font_op cfo;
153 cfo.op = KD_FONT_OP_SET;
154 cfo.flags = 0;
155 cfo.width = width;
156 cfo.height = height;
157 cfo.charcount = fontsize;
158 cfo.data = buf;
159 xioctl(fd, KDFONTOP, &cfo);
160 }
161
162 free(buf);
163 }
164
165 /*
166 * Format of the Unicode information:
167 *
168 * For each font position <uc>*<seq>*<term>
169 * where <uc> is a 2-byte little endian Unicode value (PSF1)
170 * or an UTF-8 coded value (PSF2),
171 * <seq> = <ss><uc><uc>*, <ss> = psf1 ? 0xFFFE : 0xFE,
172 * <term> = psf1 ? 0xFFFF : 0xFF.
173 * and * denotes zero or more occurrences of the preceding item.
174 *
175 * Semantics:
176 * The leading <uc>* part gives Unicode symbols that are all
177 * represented by this font position. The following sequences
178 * are sequences of Unicode symbols - probably a symbol
179 * together with combining accents - also represented by
180 * this font position.
181 *
182 * Example:
183 * At the font position for a capital A-ring glyph, we
184 * may have:
185 * 00C5,212B,FFFE,0041,030A,FFFF
186 * Some font positions may be described by sequences only,
187 * namely when there is no precomposed Unicode value for the glyph.
188 */
189 #if !ENABLE_FEATURE_LOADFONT_PSF2
190 #define do_loadtable(fd, inbuf, tailsz, fontsize, psf2) \
191 do_loadtable(fd, inbuf, tailsz, fontsize)
192 #endif
do_loadtable(int fd,unsigned char * inbuf,int tailsz,int fontsize,int psf2)193 static void do_loadtable(int fd, unsigned char *inbuf, int tailsz, int fontsize, int psf2)
194 {
195 #if !ENABLE_FEATURE_LOADFONT_PSF2
196 /* gcc 4.3.1 code size: */
197 # define psf2 0 /* +0 bytes */
198 // const int psf2 = 0; /* +8 bytes */
199 // enum { psf2 = 0 }; /* +13 bytes */
200 #endif
201 struct unimapinit advice;
202 struct unimapdesc ud;
203 struct unipair *up;
204 int ct = 0, maxct;
205 int glyph;
206 uint16_t unicode;
207
208 maxct = tailsz; /* more than enough */
209 up = xmalloc(maxct * sizeof(*up));
210
211 for (glyph = 0; glyph < fontsize; glyph++) {
212 while (tailsz > 0) {
213 if (!psf2) { /* PSF1 */
214 unicode = (((uint16_t) inbuf[1]) << 8) + inbuf[0];
215 tailsz -= 2;
216 inbuf += 2;
217 if (unicode == PSF1_SEPARATOR)
218 break;
219 } else { /* PSF2 */
220 #if ENABLE_FEATURE_LOADFONT_PSF2
221 --tailsz;
222 unicode = *inbuf++;
223 if (unicode == PSF2_SEPARATOR) {
224 break;
225 } else if (unicode == PSF2_STARTSEQ) {
226 bb_simple_error_msg_and_die("unicode sequences not implemented");
227 } else if (unicode >= 0xC0) {
228 if (unicode >= 0xFC)
229 unicode &= 0x01, maxct = 5;
230 else if (unicode >= 0xF8)
231 unicode &= 0x03, maxct = 4;
232 else if (unicode >= 0xF0)
233 unicode &= 0x07, maxct = 3;
234 else if (unicode >= 0xE0)
235 unicode &= 0x0F, maxct = 2;
236 else
237 unicode &= 0x1F, maxct = 1;
238 do {
239 if (tailsz <= 0 || *inbuf < 0x80 || *inbuf > 0xBF)
240 bb_simple_error_msg_and_die("illegal UTF-8 character");
241 --tailsz;
242 unicode = (unicode << 6) + (*inbuf++ & 0x3F);
243 } while (--maxct > 0);
244 } else if (unicode >= 0x80) {
245 bb_simple_error_msg_and_die("illegal UTF-8 character");
246 }
247 #else
248 return;
249 #endif
250 }
251 up[ct].unicode = unicode;
252 up[ct].fontpos = glyph;
253 ct++;
254 }
255 }
256
257 /* Note: after PIO_UNIMAPCLR and before PIO_UNIMAP
258 * this printf did not work on many kernels */
259
260 advice.advised_hashsize = 0;
261 advice.advised_hashstep = 0;
262 advice.advised_hashlevel = 0;
263 xioctl(fd, PIO_UNIMAPCLR, &advice);
264 ud.entry_ct = ct;
265 ud.entries = up;
266 xioctl(fd, PIO_UNIMAP, &ud);
267 #undef psf2
268 }
269
do_load(int fd,unsigned char * buffer,size_t len)270 static void do_load(int fd, unsigned char *buffer, size_t len)
271 {
272 int height;
273 int width = 8;
274 int charsize;
275 int fontsize = 256;
276 int has_table = 0;
277 unsigned char *font = buffer;
278 unsigned char *table;
279
280 if (len >= sizeof(struct psf1_header) && PSF1_MAGIC_OK(psf1h(buffer))) {
281 if (psf1h(buffer)->mode > PSF1_MAXMODE)
282 bb_simple_error_msg_and_die("unsupported psf file mode");
283 if (psf1h(buffer)->mode & PSF1_MODE512)
284 fontsize = 512;
285 if (psf1h(buffer)->mode & PSF1_MODEHASTAB)
286 has_table = 1;
287 height = charsize = psf1h(buffer)->charsize;
288 font += sizeof(struct psf1_header);
289 } else
290 #if ENABLE_FEATURE_LOADFONT_PSF2
291 if (len >= sizeof(struct psf2_header) && PSF2_MAGIC_OK(psf2h(buffer))) {
292 if (psf2h(buffer)->version > PSF2_MAXVERSION)
293 bb_simple_error_msg_and_die("unsupported psf file version");
294 fontsize = psf2h(buffer)->length;
295 if (psf2h(buffer)->flags & PSF2_HAS_UNICODE_TABLE)
296 has_table = 2;
297 charsize = psf2h(buffer)->charsize;
298 height = psf2h(buffer)->height;
299 width = psf2h(buffer)->width;
300 font += psf2h(buffer)->headersize;
301 } else
302 #endif
303 #if ENABLE_FEATURE_LOADFONT_RAW
304 if (len == 9780) { /* file with three code pages? */
305 charsize = height = 16;
306 font += 40;
307 } else if ((len & 0377) == 0) { /* bare font */
308 charsize = height = len / 256;
309 } else
310 #endif
311 {
312 bb_simple_error_msg_and_die("input file: bad length or unsupported font type");
313 }
314
315 #if !defined(PIO_FONTX) || defined(__sparc__)
316 if (fontsize != 256)
317 bb_simple_error_msg_and_die("only fontsize 256 supported");
318 #endif
319
320 table = font + fontsize * charsize;
321 buffer += len;
322
323 if (table > buffer || (!has_table && table != buffer))
324 bb_simple_error_msg_and_die("input file: bad length");
325
326 do_loadfont(fd, font, height, width, charsize, fontsize);
327
328 if (has_table)
329 do_loadtable(fd, table, buffer - table, fontsize, has_table - 1);
330 }
331
332
333 #if ENABLE_LOADFONT
334 //usage:#define loadfont_trivial_usage
335 //usage: "< font"
336 //usage:#define loadfont_full_usage "\n\n"
337 //usage: "Load a console font from stdin"
338 /* //usage: "\n -C TTY Affect TTY instead of /dev/tty" */
339 //usage:
340 //usage:#define loadfont_example_usage
341 //usage: "$ loadfont < /etc/i18n/fontname\n"
342 int loadfont_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
loadfont_main(int argc UNUSED_PARAM,char ** argv)343 int loadfont_main(int argc UNUSED_PARAM, char **argv)
344 {
345 size_t len;
346 unsigned char *buffer;
347
348 // no arguments allowed!
349 getopt32(argv, "^" "" "\0" "=0");
350
351 /*
352 * We used to look at the length of the input file
353 * with stat(); now that we accept compressed files,
354 * just read the entire file.
355 * Len was 32k, but latarcyrheb-sun32.psfu is 34377 bytes
356 * (it has largish Unicode map).
357 */
358 len = 128*1024;
359 buffer = xmalloc_read(STDIN_FILENO, &len);
360 // xmalloc_open_zipped_read_close(filename, &len);
361 if (!buffer)
362 bb_simple_perror_msg_and_die("error reading input font");
363 do_load(get_console_fd_or_die(), buffer, len);
364
365 return EXIT_SUCCESS;
366 }
367 #endif
368
369
370 #if ENABLE_SETFONT
371 /* kbd-1.12:
372 setfont [-O font+umap.orig] [-o font.orig] [-om cmap.orig]
373 [-ou umap.orig] [-N] [font.new ...] [-m cmap] [-u umap] [-C console]
374 [-hNN] [-v] [-V]
375
376 -h NN Override font height
377 -o file
378 Save previous font in file
379 -O file
380 Save previous font and Unicode map in file
381 -om file
382 Store console map in file
383 -ou file
384 Save previous Unicode map in file
385 -m file
386 Load console map or Unicode console map from file
387 -u file
388 Load Unicode table describing the font from file
389 Example:
390 # cp866
391 0x00-0x7f idem
392 #
393 0x80 U+0410 # CYRILLIC CAPITAL LETTER A
394 0x81 U+0411 # CYRILLIC CAPITAL LETTER BE
395 0x82 U+0412 # CYRILLIC CAPITAL LETTER VE
396 -C console
397 Set the font for the indicated console
398 -v Verbose
399 -V Version
400 */
401 //usage:#define setfont_trivial_usage
402 //usage: "[-m MAPFILE] [-C TTY] FILE"
403 //usage:#define setfont_full_usage "\n\n"
404 //usage: "Load a console font\n"
405 //usage: "\n -m MAPFILE Load console screen map"
406 //usage: "\n -C TTY Affect TTY instead of /dev/tty"
407 //usage:
408 //usage:#define setfont_example_usage
409 //usage: "$ setfont -m koi8-r /etc/i18n/fontname\n"
410
411 # if ENABLE_FEATURE_SETFONT_TEXTUAL_MAP
ctoi(char * s)412 static int ctoi(char *s)
413 {
414 if (s[0] == '\'' && s[1] != '\0' && s[2] == '\'' && s[3] == '\0')
415 return s[1];
416 // U+ means 0x
417 if (s[0] == 'U' && s[1] == '+') {
418 s[0] = '0';
419 s[1] = 'x';
420 }
421 if (!isdigit(s[0]))
422 return -1;
423 return xstrtoul(s, 0);
424 }
425 # endif
426
427 int setfont_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
setfont_main(int argc UNUSED_PARAM,char ** argv)428 int setfont_main(int argc UNUSED_PARAM, char **argv)
429 {
430 size_t len;
431 unsigned opts;
432 int fd;
433 unsigned char *buffer;
434 char *mapfilename;
435 const char *tty_name = CURRENT_TTY;
436
437 opts = getopt32(argv, "^" "m:C:" "\0" "=1", &mapfilename, &tty_name);
438 argv += optind;
439
440 fd = xopen_nonblocking(tty_name);
441
442 if (sizeof(CONFIG_DEFAULT_SETFONT_DIR) > 1) { // if not ""
443 if (*argv[0] != '/') {
444 // goto default fonts location. don't die if doesn't exist
445 chdir(CONFIG_DEFAULT_SETFONT_DIR "/consolefonts");
446 }
447 }
448 // load font
449 len = 128*1024;
450 buffer = xmalloc_open_zipped_read_close(*argv, &len);
451 if (!buffer)
452 bb_simple_perror_msg_and_die(*argv);
453 do_load(fd, buffer, len);
454
455 // load the screen map, if any
456 if (opts & 1) { // -m
457 unsigned mode = PIO_SCRNMAP;
458 void *map;
459
460 if (sizeof(CONFIG_DEFAULT_SETFONT_DIR) > 1) { // if not ""
461 if (mapfilename[0] != '/') {
462 // goto default keymaps location
463 chdir(CONFIG_DEFAULT_SETFONT_DIR "/consoletrans");
464 }
465 }
466 // fetch keymap
467 map = xmalloc_open_zipped_read_close(mapfilename, &len);
468 if (!map)
469 bb_simple_perror_msg_and_die(mapfilename);
470 // file size is 256 or 512 bytes? -> assume binary map
471 if (len == E_TABSZ || len == 2*E_TABSZ) {
472 if (len == 2*E_TABSZ)
473 mode = PIO_UNISCRNMAP;
474 }
475 # if ENABLE_FEATURE_SETFONT_TEXTUAL_MAP
476 // assume textual Unicode console maps:
477 // 0x00 U+0000 # NULL (NUL)
478 // 0x01 U+0001 # START OF HEADING (SOH)
479 // 0x02 U+0002 # START OF TEXT (STX)
480 // 0x03 U+0003 # END OF TEXT (ETX)
481 else {
482 int i;
483 char *token[2];
484 parser_t *parser;
485
486 if (ENABLE_FEATURE_CLEAN_UP)
487 free(map);
488 map = xmalloc(E_TABSZ * sizeof(unsigned short));
489
490 #define unicodes ((unsigned short *)map)
491 // fill vanilla map
492 for (i = 0; i < E_TABSZ; i++)
493 unicodes[i] = 0xf000 + i;
494
495 parser = config_open(mapfilename);
496 while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
497 // parse code/value pair
498 int a = ctoi(token[0]);
499 int b = ctoi(token[1]);
500 if (a < 0 || a >= E_TABSZ
501 || b < 0 || b > 65535
502 ) {
503 bb_simple_error_msg_and_die("map format");
504 }
505 // patch map
506 unicodes[a] = b;
507 // unicode character is met?
508 if (b > 255)
509 mode = PIO_UNISCRNMAP;
510 }
511 if (ENABLE_FEATURE_CLEAN_UP)
512 config_close(parser);
513
514 if (mode != PIO_UNISCRNMAP) {
515 #define asciis ((unsigned char *)map)
516 for (i = 0; i < E_TABSZ; i++)
517 asciis[i] = unicodes[i];
518 #undef asciis
519 }
520 #undef unicodes
521 }
522 # endif // ENABLE_FEATURE_SETFONT_TEXTUAL_MAP
523
524 // do set screen map
525 xioctl(fd, mode, map);
526
527 if (ENABLE_FEATURE_CLEAN_UP)
528 free(map);
529 }
530
531 return EXIT_SUCCESS;
532 }
533 #endif
534