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204 lines
4.7 KiB
C
204 lines
4.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* loadfont.c - Eugene Crosser & Andries Brouwer
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*
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* Version 0.96bb
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*
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* Loads the console font, and possibly the corresponding screen map(s).
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* (Adapted for busybox by Matej Vela.)
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*/
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/kd.h>
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#include <endian.h>
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#include "busybox.h"
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enum{
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PSF_MAGIC1 = 0x36,
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PSF_MAGIC2 = 0x04,
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PSF_MODE512 = 0x01,
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PSF_MODEHASTAB = 0x02,
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PSF_MAXMODE = 0x03,
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PSF_SEPARATOR = 0xFFFF
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};
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struct psf_header {
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unsigned char magic1, magic2; /* Magic number */
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unsigned char mode; /* PSF font mode */
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unsigned char charsize; /* Character size */
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};
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#define PSF_MAGIC_OK(x) ((x).magic1 == PSF_MAGIC1 && (x).magic2 == PSF_MAGIC2)
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static void loadnewfont(int fd);
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int loadfont_main(int argc, char **argv)
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{
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int fd;
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if (argc != 1)
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bb_show_usage();
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fd = bb_xopen(CURRENT_VC, O_RDWR);
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loadnewfont(fd);
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return EXIT_SUCCESS;
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}
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static void do_loadfont(int fd, unsigned char *inbuf, int unit, int fontsize)
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{
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char buf[16384];
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int i;
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memset(buf, 0, sizeof(buf));
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if (unit < 1 || unit > 32)
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bb_error_msg_and_die("Bad character size %d", unit);
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for (i = 0; i < fontsize; i++)
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memcpy(buf + (32 * i), inbuf + (unit * i), unit);
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#if defined( PIO_FONTX ) && !defined( __sparc__ )
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{
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struct consolefontdesc cfd;
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cfd.charcount = fontsize;
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cfd.charheight = unit;
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cfd.chardata = buf;
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if (ioctl(fd, PIO_FONTX, &cfd) == 0)
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return; /* success */
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bb_perror_msg("PIO_FONTX ioctl error (trying PIO_FONT)");
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}
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#endif
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if (ioctl(fd, PIO_FONT, buf))
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bb_perror_msg_and_die("PIO_FONT ioctl error");
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}
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static void
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do_loadtable(int fd, unsigned char *inbuf, int tailsz, int fontsize)
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{
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struct unimapinit advice;
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struct unimapdesc ud;
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struct unipair *up;
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int ct = 0, maxct;
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int glyph;
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u_short unicode;
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maxct = tailsz; /* more than enough */
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up = (struct unipair *) xmalloc(maxct * sizeof(struct unipair));
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for (glyph = 0; glyph < fontsize; glyph++) {
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while (tailsz >= 2) {
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unicode = (((u_short) inbuf[1]) << 8) + inbuf[0];
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tailsz -= 2;
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inbuf += 2;
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if (unicode == PSF_SEPARATOR)
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break;
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up[ct].unicode = unicode;
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up[ct].fontpos = glyph;
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ct++;
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}
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}
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/* Note: after PIO_UNIMAPCLR and before PIO_UNIMAP
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this printf did not work on many kernels */
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advice.advised_hashsize = 0;
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advice.advised_hashstep = 0;
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advice.advised_hashlevel = 0;
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if (ioctl(fd, PIO_UNIMAPCLR, &advice)) {
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#ifdef ENOIOCTLCMD
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if (errno == ENOIOCTLCMD) {
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bb_error_msg("It seems this kernel is older than 1.1.92");
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bb_error_msg_and_die("No Unicode mapping table loaded.");
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} else
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#endif
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bb_perror_msg_and_die("PIO_UNIMAPCLR");
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}
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ud.entry_ct = ct;
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ud.entries = up;
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if (ioctl(fd, PIO_UNIMAP, &ud)) {
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bb_perror_msg_and_die("PIO_UNIMAP");
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}
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}
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static void loadnewfont(int fd)
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{
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int unit;
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unsigned char inbuf[32768]; /* primitive */
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unsigned int inputlth, offset;
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/*
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* We used to look at the length of the input file
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* with stat(); now that we accept compressed files,
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* just read the entire file.
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*/
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inputlth = fread(inbuf, 1, sizeof(inbuf), stdin);
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if (ferror(stdin))
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bb_perror_msg_and_die("Error reading input font");
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/* use malloc/realloc in case of giant files;
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maybe these do not occur: 16kB for the font,
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and 16kB for the map leaves 32 unicode values
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for each font position */
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if (!feof(stdin))
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bb_perror_msg_and_die("Font too large");
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/* test for psf first */
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{
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struct psf_header psfhdr;
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int fontsize;
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int hastable;
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unsigned int head0, head;
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if (inputlth < sizeof(struct psf_header))
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goto no_psf;
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psfhdr = *(struct psf_header *) &inbuf[0];
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if (!PSF_MAGIC_OK(psfhdr))
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goto no_psf;
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if (psfhdr.mode > PSF_MAXMODE)
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bb_error_msg_and_die("Unsupported psf file mode");
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fontsize = ((psfhdr.mode & PSF_MODE512) ? 512 : 256);
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#if !defined( PIO_FONTX ) || defined( __sparc__ )
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if (fontsize != 256)
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bb_error_msg_and_die("Only fontsize 256 supported");
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#endif
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hastable = (psfhdr.mode & PSF_MODEHASTAB);
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unit = psfhdr.charsize;
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head0 = sizeof(struct psf_header);
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head = head0 + fontsize * unit;
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if (head > inputlth || (!hastable && head != inputlth))
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bb_error_msg_and_die("Input file: bad length");
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do_loadfont(fd, inbuf + head0, unit, fontsize);
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if (hastable)
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do_loadtable(fd, inbuf + head, inputlth - head, fontsize);
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return;
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}
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no_psf:
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/* file with three code pages? */
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if (inputlth == 9780) {
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offset = 40;
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unit = 16;
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} else {
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/* bare font */
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if (inputlth & 0377)
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bb_error_msg_and_die("Bad input file size");
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offset = 0;
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unit = inputlth / 256;
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}
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do_loadfont(fd, inbuf + offset, unit, 256);
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}
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