diff options
Diffstat (limited to 'console-tools/loadfont.c')
| -rw-r--r-- | console-tools/loadfont.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/console-tools/loadfont.c b/console-tools/loadfont.c new file mode 100644 index 0000000..a10fa8a --- /dev/null +++ b/console-tools/loadfont.c @@ -0,0 +1,234 @@ +/* + * 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); +} |