diff options
Diffstat (limited to 'busybox/console-tools/loadfont.c')
| -rw-r--r-- | busybox/console-tools/loadfont.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/busybox/console-tools/loadfont.c b/busybox/console-tools/loadfont.c new file mode 100644 index 0000000..4580dc4 --- /dev/null +++ b/busybox/console-tools/loadfont.c @@ -0,0 +1,207 @@ +/* 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 <stdio.h> +#include <string.h> +#include <fcntl.h> +#include <memory.h> +#include <stdlib.h> +#include <unistd.h> +#include <sys/types.h> +#include <dirent.h> +#include <errno.h> +#include <sys/ioctl.h> +#include <sys/kd.h> +#include <endian.h> +#include "busybox.h" + +static const int PSF_MAGIC1 = 0x36; +static const int PSF_MAGIC2 = 0x04; + +static const int PSF_MODE512 = 0x01; +static const int PSF_MODEHASTAB = 0x02; +static const int PSF_MAXMODE = 0x03; +static const int 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); + +extern int loadfont_main(int argc, char **argv) +{ + int fd; + + if (argc != 1) + bb_show_usage(); + + fd = bb_xopen(CURRENT_VC, O_RDWR); + loadnewfont(fd); + + return EXIT_SUCCESS; +} + +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) + 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; + u_short unicode; + + maxct = tailsz; /* more than enough */ + up = (struct unipair *) xmalloc(maxct * sizeof(struct unipair)); + + 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) { + 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)) { +#if 0 + if (errno == ENOMEM) { + /* change advice parameters */ + } +#endif + bb_perror_msg_and_die("PIO_UNIMAP"); + } +} + +static void loadnewfont(int fd) +{ + int unit; + 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); +} |