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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.)
*/
#include "libbb.h"
#include <sys/kd.h>
enum {
PSF_MAGIC1 = 0x36,
PSF_MAGIC2 = 0x04,
PSF_MODE512 = 0x01,
PSF_MODEHASTAB = 0x02,
PSF_MAXMODE = 0x03,
PSF_SEPARATOR = 0xFFFF
};
struct psf_header {
unsigned char magic1, magic2; /* Magic number */
unsigned char mode; /* PSF font mode */
unsigned char charsize; /* Character size */
};
#define PSF_MAGIC_OK(x) ((x)->magic1 == PSF_MAGIC1 && (x)->magic2 == PSF_MAGIC2)
static void do_loadfont(int fd, unsigned char *inbuf, int unit, int fontsize)
{
char *buf;
int i;
if (unit < 1 || unit > 32)
bb_error_msg_and_die("bad character size %d", unit);
buf = xzalloc(16 * 1024);
for (i = 0; i < fontsize; i++)
memcpy(buf + (32 * i), inbuf + (unit * i), unit);
#if defined(PIO_FONTX) && !defined(__sparc__)
{
struct consolefontdesc cfd;
cfd.charcount = fontsize;
cfd.charheight = unit;
cfd.chardata = buf;
if (!ioctl_or_perror(fd, PIO_FONTX, &cfd, "PIO_FONTX ioctl failed (will try PIO_FONT)"))
goto ret; /* success */
}
#endif
xioctl(fd, PIO_FONT, buf);
ret:
free(buf);
}
static void do_loadtable(int fd, unsigned char *inbuf, int tailsz, int fontsize)
{
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(struct unipair));
for (glyph = 0; glyph < fontsize; glyph++) {
while (tailsz >= 2) {
unicode = (((uint16_t) inbuf[1]) << 8) + inbuf[0];
tailsz -= 2;
inbuf += 2;
if (unicode == PSF_SEPARATOR)
break;
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);
}
static void do_load(int fd, struct psf_header *psfhdr, size_t len)
{
int unit;
int fontsize;
int hastable;
unsigned head0, head = head;
/* test for psf first */
if (len >= sizeof(struct psf_header) && PSF_MAGIC_OK(psfhdr)) {
if (psfhdr->mode > PSF_MAXMODE)
bb_error_msg_and_die("unsupported psf file mode");
fontsize = ((psfhdr->mode & PSF_MODE512) ? 512 : 256);
#if !defined(PIO_FONTX) || defined(__sparc__)
if (fontsize != 256)
bb_error_msg_and_die("only fontsize 256 supported");
#endif
hastable = (psfhdr->mode & PSF_MODEHASTAB);
unit = psfhdr->charsize;
head0 = sizeof(struct psf_header);
head = head0 + fontsize * unit;
if (head > len || (!hastable && head != len))
bb_error_msg_and_die("input file: bad length");
} else {
/* file with three code pages? */
if (len == 9780) {
head0 = 40;
unit = 16;
} else {
/* bare font */
if (len & 0377)
bb_error_msg_and_die("input file: bad length");
head0 = 0;
unit = len / 256;
}
fontsize = 256;
hastable = 0;
}
do_loadfont(fd, (unsigned char *)psfhdr + head0, unit, fontsize);
if (hastable)
do_loadtable(fd, (unsigned char *)psfhdr + head, len - head, fontsize);
}
#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;
struct psf_header *psfhdr;
// 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 = 32*1024; // can't be larger
psfhdr = (struct psf_header *) xmalloc_read(STDIN_FILENO, &len);
// xmalloc_open_zipped_read_close(filename, &len);
if (!psfhdr)
bb_perror_msg_and_die("error reading input font");
do_load(get_console_fd_or_die(), psfhdr, len);
return EXIT_SUCCESS;
}
#endif
#if ENABLE_SETFONT
int setfont_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int setfont_main(int argc UNUSED_PARAM, char **argv)
{
size_t len;
struct psf_header *psfhdr;
char *mapfilename;
int fd;
opt_complementary = "=1";
getopt32(argv, "m:", &mapfilename);
argv += optind;
// load font
len = 32*1024; // can't be larger
psfhdr = (struct psf_header *) xmalloc_open_zipped_read_close(*argv, &len);
fd = get_console_fd_or_die();
do_load(fd, psfhdr, len);
// load the screen map, if any
if (option_mask32 & 1) { // -m
void *map = xmalloc_open_zipped_read_close(mapfilename, &len);
if (len == E_TABSZ || len == 2*E_TABSZ) {
xioctl(fd, (len == 2*E_TABSZ) ? PIO_UNISCRNMAP : PIO_SCRNMAP, map);
}
}
return EXIT_SUCCESS;
}
#endif
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