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busybox/console-tools/loadfont.c
Denys Vlasenko 1b280e4652 loadfont,setfont: make them NOEXEC 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-08-06 19:05:45 +02:00

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/* 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 (5.4 kb)"
//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 (26 kb)"
//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 PSF2 console fonts"
//config: default y
//config: depends on LOADFONT || SETFONT
//config:
//config:config FEATURE_LOADFONT_RAW
//config: bool "Support old (raw) console fonts"
//config: default y
//config: depends on LOADFONT || SETFONT
//applet:IF_LOADFONT(APPLET_NOEXEC(loadfont, loadfont, BB_DIR_USR_SBIN, BB_SUID_DROP, loadfont))
//applet:IF_SETFONT(APPLET_NOEXEC(setfont, setfont, BB_DIR_USR_SBIN, BB_SUID_DROP, setfont))
//kbuild:lib-$(CONFIG_LOADFONT) += loadfont.o
//kbuild:lib-$(CONFIG_SETFONT) += loadfont.o
#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
//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"
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
*/
//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"
# 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
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