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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 loadnewfont(int fd);
int loadfont_main(int argc, char **argv);
int loadfont_main(int argc, char **argv)
{
int fd;
if (argc != 1)
bb_show_usage();
fd = xopen(CURRENT_VC, O_RDWR);
loadnewfont(fd);
return EXIT_SUCCESS;
}
static void do_loadfont(int fd, unsigned char *inbuf, int unit, int fontsize)
{
char buf[16384];
int i;
memset(buf, 0, sizeof(buf));
if (unit < 1 || unit > 32)
bb_error_msg_and_die("bad character size %d", unit);
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(fd, PIO_FONTX, &cfd) == 0)
return; /* success */
bb_perror_msg("PIO_FONTX ioctl error (trying PIO_FONT)");
}
#endif
if (ioctl(fd, PIO_FONT, buf))
bb_perror_msg_and_die("PIO_FONT ioctl error");
}
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;
if (ioctl(fd, PIO_UNIMAPCLR, &advice)) {
#ifdef ENOIOCTLCMD
if (errno == ENOIOCTLCMD) {
bb_error_msg("it seems this kernel is older than 1.1.92");
bb_error_msg_and_die("no Unicode mapping table loaded");
} else
#endif
bb_perror_msg_and_die("PIO_UNIMAPCLR");
}
ud.entry_ct = ct;
ud.entries = up;
if (ioctl(fd, PIO_UNIMAP, &ud)) {
bb_perror_msg_and_die("PIO_UNIMAP");
}
}
static void loadnewfont(int fd)
{
int unit;
unsigned char inbuf[32768]; /* primitive */
unsigned int inputlth, offset;
/*
* We used to look at the length of the input file
* with stat(); now that we accept compressed files,
* just read the entire file.
*/
inputlth = fread(inbuf, 1, sizeof(inbuf), stdin);
if (ferror(stdin))
bb_perror_msg_and_die("error reading input font");
/* use malloc/realloc in case of giant files;
maybe these do not occur: 16kB for the font,
and 16kB for the map leaves 32 unicode values
for each font position */
if (!feof(stdin))
bb_perror_msg_and_die("font too large");
/* test for psf first */
{
struct psf_header psfhdr;
int fontsize;
int hastable;
unsigned int head0, head;
if (inputlth < sizeof(struct psf_header))
goto no_psf;
psfhdr = *(struct psf_header *) &inbuf[0];
if (!PSF_MAGIC_OK(psfhdr))
goto no_psf;
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 > inputlth || (!hastable && head != inputlth))
bb_error_msg_and_die("input file: bad length");
do_loadfont(fd, inbuf + head0, unit, fontsize);
if (hastable)
do_loadtable(fd, inbuf + head, inputlth - head, fontsize);
return;
}
no_psf:
/* file with three code pages? */
if (inputlth == 9780) {
offset = 40;
unit = 16;
} else {
/* bare font */
if (inputlth & 0377)
bb_error_msg_and_die("bad input file size");
offset = 0;
unit = inputlth / 256;
}
do_loadfont(fd, inbuf + offset, unit, 256);
}
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