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/*
* 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 "internal.h"
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <memory.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/kd.h>
#include <endian.h>
#define PSF_MAGIC1 0x36
#define PSF_MAGIC2 0x04
#define PSF_MODE512 0x01
#define PSF_MODEHASTAB 0x02
#define PSF_MAXMODE 0x03
#define PSF_SEPARATOR 0xFFFF
static const char loadfont_usage[] = "loadfont\n"
"\n"
"\tLoad a console font from standard input.\n"
"\n";
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);
extern int
loadfont_main(int argc, char **argv)
{
int fd;
fd = open("/dev/tty0", O_RDWR);
if (fd < 0) {
fprintf(stderr, "Error opening /dev/tty0: %s\n", strerror(errno));
return 1;
}
loadnewfont(fd);
return 0;
}
static void
do_loadfont(int fd, char *inbuf, int unit, int fontsize) {
char buf[16384];
int i;
memset(buf,0,sizeof(buf));
if (unit < 1 || unit > 32) {
fprintf(stderr, "Bad character size %d\n", unit);
exit(1);
}
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 */
perror("PIO_FONTX ioctl error (trying PIO_FONT)");
}
#endif
if (ioctl(fd, PIO_FONT, buf)) {
perror("PIO_FONT ioctl error");
exit(1);
}
}
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;
u_short unicode;
maxct = tailsz; /* more than enough */
up = (struct unipair *) malloc(maxct * sizeof(struct unipair));
if (!up) {
fprintf(stderr, "Out of memory?\n");
exit(1);
}
for (glyph = 0; glyph < fontsize; glyph++) {
while (tailsz >= 2) {
unicode = (((u_short) 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) {
fprintf(stderr, "It seems this kernel is older than 1.1.92\n");
fprintf(stderr, "No Unicode mapping table loaded.\n");
} else
#endif
perror("PIO_UNIMAPCLR");
exit(1);
}
ud.entry_ct = ct;
ud.entries = up;
if(ioctl(fd, PIO_UNIMAP, &ud)) {
#if 0
if (errno == ENOMEM) {
/* change advice parameters */
}
#endif
perror("PIO_UNIMAP");
exit(1);
}
}
static void
loadnewfont(int fd) {
int unit;
char inbuf[32768]; /* primitive */
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)) {
perror("Error reading input font");
exit(1);
}
/* 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)) {
perror("Font too large");
exit(1);
}
/* test for psf first */
{
struct psf_header psfhdr;
int fontsize;
int hastable;
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) {
fprintf(stderr, "Unsupported psf file mode\n");
exit(1);
}
fontsize = ((psfhdr.mode & PSF_MODE512) ? 512 : 256);
#if !defined( PIO_FONTX ) || defined( __sparc__ )
if (fontsize != 256) {
fprintf(stderr, "Only fontsize 256 supported\n");
exit(1);
}
#endif
hastable = (psfhdr.mode & PSF_MODEHASTAB);
unit = psfhdr.charsize;
head0 = sizeof(struct psf_header);
head = head0 + fontsize*unit;
if (head > inputlth || (!hastable && head != inputlth)) {
fprintf(stderr, "Input file: bad length\n");
exit(1);
}
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) {
fprintf(stderr, "Bad input file size\n");
exit(1);
}
offset = 0;
unit = inputlth/256;
}
do_loadfont(fd, inbuf+offset, unit, 256);
}
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