text: /* 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.)
   *
   * Licensed under GPLv2, see file LICENSE in this source tree.
   */
  
  //usage:#define loadfont_trivial_usage
  //usage:       "< font"
  //usage:#define loadfont_full_usage "\n\n"
  //usage:       "Load a console font from stdin"
  /* //usage:     "\n	-C TTY	Affect TTY instead of /dev/tty" */
  //usage:
  //usage:#define loadfont_example_usage
  //usage:       "$ loadfont < /etc/i18n/fontname\n"
  //usage:
  //usage:#define setfont_trivial_usage
  //usage:       "FONT [-m MAPFILE] [-C TTY]"
  //usage:#define setfont_full_usage "\n\n"
  //usage:       "Load a console font\n"
  //usage:     "\n	-m MAPFILE	Load console screen map"
  //usage:     "\n	-C TTY		Affect TTY instead of /dev/tty"
  //usage:
  //usage:#define setfont_example_usage
  //usage:       "$ setfont -m koi8-r /etc/i18n/fontname\n"
  
  #include "libbb.h"
  #include <sys/kd.h>
  
  #ifndef KDFONTOP
  # define KDFONTOP 0x4B72
  struct console_font_op {
  	unsigned op;            /* KD_FONT_OP_* */
  	unsigned flags;         /* KD_FONT_FLAG_* */
  	unsigned width, height;
  	unsigned charcount;
  	unsigned char *data;    /* font data with height fixed to 32 */
  };
  # define KD_FONT_OP_SET          0  /* Set font */
  # define KD_FONT_OP_GET          1  /* Get font */
  # define KD_FONT_OP_SET_DEFAULT  2  /* Set font to default, data points to name / NULL */
  # define KD_FONT_OP_COPY         3  /* Copy from another console */
  # define KD_FONT_FLAG_OLD        0x80000000 /* Invoked via old interface */
  # define KD_FONT_FLAG_DONT_RECALC 1 /* Don't call adjust_height() */
                                     /* (Used internally for PIO_FONT support) */
  #endif /* KDFONTOP */
  
  
  enum {
  	PSF1_MAGIC0 = 0x36,
  	PSF1_MAGIC1 = 0x04,
  	PSF1_MODE512 = 0x01,
  	PSF1_MODEHASTAB = 0x02,
  	PSF1_MODEHASSEQ = 0x04,
  	PSF1_MAXMODE = 0x05,
  	PSF1_STARTSEQ = 0xfffe,
  	PSF1_SEPARATOR = 0xffff,
  };
  
  struct psf1_header {
  	unsigned char magic[2];         /* Magic number */
  	unsigned char mode;             /* PSF font mode */
  	unsigned char charsize;         /* Character size */
  };
  
  #define psf1h(x) ((struct psf1_header*)(x))
  
  #define PSF1_MAGIC_OK(x) ( \
       (x)->magic[0] == PSF1_MAGIC0 \
    && (x)->magic[1] == PSF1_MAGIC1 \
  )
  
  #if ENABLE_FEATURE_LOADFONT_PSF2
  enum {
  	PSF2_MAGIC0 = 0x72,
  	PSF2_MAGIC1 = 0xb5,
  	PSF2_MAGIC2 = 0x4a,
  	PSF2_MAGIC3 = 0x86,
  	PSF2_HAS_UNICODE_TABLE = 0x01,
  	PSF2_MAXVERSION = 0,
  	PSF2_STARTSEQ = 0xfe,
  	PSF2_SEPARATOR = 0xff
  };
  
  struct psf2_header {
  	unsigned char magic[4];
  	unsigned int version;
  	unsigned int headersize;    /* offset of bitmaps in file */
  	unsigned int flags;
  	unsigned int length;        /* number of glyphs */
  	unsigned int charsize;      /* number of bytes for each character */
  	unsigned int height;        /* max dimensions of glyphs */
  	unsigned int width;         /* charsize = height * ((width + 7) / 8) */
  };
  
  #define psf2h(x) ((struct psf2_header*)(x))
  
  #define PSF2_MAGIC_OK(x) ( \
       (x)->magic[0] == PSF2_MAGIC0 \
    && (x)->magic[1] == PSF2_MAGIC1 \
    && (x)->magic[2] == PSF2_MAGIC2 \
    && (x)->magic[3] == PSF2_MAGIC3 \
  )
  #endif /* ENABLE_FEATURE_LOADFONT_PSF2 */
  
  
  static void do_loadfont(int fd, unsigned char *inbuf, int height, int width, int charsize, int fontsize)
  {
  	unsigned char *buf;
  	int charwidth = 32 * ((width+7)/8);
  	int i;
  
  	if (height < 1 || height > 32 || width < 1 || width > 32)
  		bb_error_msg_and_die("bad character size %dx%d", height, width);
  
  	buf = xzalloc(charwidth * ((fontsize < 128) ? 128 : fontsize));
  	for (i = 0; i < fontsize; i++)
  		memcpy(buf + (i*charwidth), inbuf + (i*charsize), charsize);
  
  	{ /* KDFONTOP */
  		struct console_font_op cfo;
  		cfo.op = KD_FONT_OP_SET;
  		cfo.flags = 0;
  		cfo.width = width;
  		cfo.height = height;
  		cfo.charcount = fontsize;
  		cfo.data = buf;
  		xioctl(fd, KDFONTOP, &cfo);
  	}
  
  	free(buf);
  }
  
  /*
   * Format of the Unicode information:
   *
   * For each font position <uc>*<seq>*<term>
   * where <uc> is a 2-byte little endian Unicode value (PSF1)
   * or an UTF-8 coded value (PSF2),
   * <seq> = <ss><uc><uc>*, <ss> = psf1 ? 0xFFFE : 0xFE,
   * <term> = psf1 ? 0xFFFF : 0xFF.
   * and * denotes zero or more occurrences of the preceding item.
   *
   * Semantics:
   * The leading <uc>* part gives Unicode symbols that are all
   * represented by this font position. The following sequences
   * are sequences of Unicode symbols - probably a symbol
   * together with combining accents - also represented by
   * this font position.
   *
   * Example:
   * At the font position for a capital A-ring glyph, we
   * may have:
   *   00C5,212B,FFFE,0041,030A,FFFF
   * Some font positions may be described by sequences only,
   * namely when there is no precomposed Unicode value for the glyph.
   */
  #if !ENABLE_FEATURE_LOADFONT_PSF2
  #define do_loadtable(fd, inbuf, tailsz, fontsize, psf2) \
  	do_loadtable(fd, inbuf, tailsz, fontsize)
  #endif
  static void do_loadtable(int fd, unsigned char *inbuf, int tailsz, int fontsize, int psf2)
  {
  #if !ENABLE_FEATURE_LOADFONT_PSF2
  /* gcc 4.3.1 code size: */
  # define psf2 0 /* +0 bytes */
  //	const int psf2 = 0; /* +8 bytes */
  //	enum { psf2 = 0 }; /* +13 bytes */
  #endif
  	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(*up));
  
  	for (glyph = 0; glyph < fontsize; glyph++) {
  		while (tailsz > 0) {
  			if (!psf2) { /* PSF1 */
  				unicode = (((uint16_t) inbuf[1]) << 8) + inbuf[0];
  				tailsz -= 2;
  				inbuf += 2;
  				if (unicode == PSF1_SEPARATOR)
  					break;
  			} else { /* PSF2 */
  #if ENABLE_FEATURE_LOADFONT_PSF2
  				--tailsz;
  				unicode = *inbuf++;
  				if (unicode == PSF2_SEPARATOR) {
  					break;
  				} else if (unicode == PSF2_STARTSEQ) {
  					bb_error_msg_and_die("unicode sequences not implemented");
  				} else if (unicode >= 0xC0) {
  					if (unicode >= 0xFC)
  						unicode &= 0x01, maxct = 5;
  					else if (unicode >= 0xF8)
  						unicode &= 0x03, maxct = 4;
  					else if (unicode >= 0xF0)
  						unicode &= 0x07, maxct = 3;
  					else if (unicode >= 0xE0)
  						unicode &= 0x0F, maxct = 2;
  					else
  						unicode &= 0x1F, maxct = 1;
  					do {
  						if (tailsz <= 0 || *inbuf < 0x80 || *inbuf > 0xBF)
  							bb_error_msg_and_die("illegal UTF-8 character");
  						--tailsz;
  						unicode = (unicode << 6) + (*inbuf++ & 0x3F);
  					} while (--maxct > 0);
  				} else if (unicode >= 0x80) {
  					bb_error_msg_and_die("illegal UTF-8 character");
  				}
  #else
  				return;
  #endif
  			}
  			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;
  	xioctl(fd, PIO_UNIMAPCLR, &advice);
  	ud.entry_ct = ct;
  	ud.entries = up;
  	xioctl(fd, PIO_UNIMAP, &ud);
  #undef psf2
  }
  
  static void do_load(int fd, unsigned char *buffer, size_t len)
  {
  	int height;
  	int width = 8;
  	int charsize;
  	int fontsize = 256;
  	int has_table = 0;
  	unsigned char *font = buffer;
  	unsigned char *table;
  
  	if (len >= sizeof(struct psf1_header) && PSF1_MAGIC_OK(psf1h(buffer))) {
  		if (psf1h(buffer)->mode > PSF1_MAXMODE)
  			bb_error_msg_and_die("unsupported psf file mode");
  		if (psf1h(buffer)->mode & PSF1_MODE512)
  			fontsize = 512;
  		if (psf1h(buffer)->mode & PSF1_MODEHASTAB)
  			has_table = 1;
  		height = charsize = psf1h(buffer)->charsize;
  		font += sizeof(struct psf1_header);
  	} else
  #if ENABLE_FEATURE_LOADFONT_PSF2
  	if (len >= sizeof(struct psf2_header) && PSF2_MAGIC_OK(psf2h(buffer))) {
  		if (psf2h(buffer)->version > PSF2_MAXVERSION)
  			bb_error_msg_and_die("unsupported psf file version");
  		fontsize = psf2h(buffer)->length;
  		if (psf2h(buffer)->flags & PSF2_HAS_UNICODE_TABLE)
  			has_table = 2;
  		charsize = psf2h(buffer)->charsize;
  		height = psf2h(buffer)->height;
  		width = psf2h(buffer)->width;
  		font += psf2h(buffer)->headersize;
  	} else
  #endif
  #if ENABLE_FEATURE_LOADFONT_RAW
  	if (len == 9780) {  /* file with three code pages? */
  		charsize = height = 16;
  		font += 40;
  	} else if ((len & 0377) == 0) {  /* bare font */
  		charsize = height = len / 256;
  	} else
  #endif
  	{
  		bb_error_msg_and_die("input file: bad length or unsupported font type");
  	}
  
  #if !defined(PIO_FONTX) || defined(__sparc__)
  	if (fontsize != 256)
  		bb_error_msg_and_die("only fontsize 256 supported");
  #endif
  
  	table = font + fontsize * charsize;
  	buffer += len;
  
  	if (table > buffer || (!has_table && table != buffer))
  		bb_error_msg_and_die("input file: bad length");
  
  	do_loadfont(fd, font, height, width, charsize, fontsize);
  
  	if (has_table)
  		do_loadtable(fd, table, buffer - table, fontsize, has_table - 1);
  }
  
  
  #if ENABLE_LOADFONT
  int loadfont_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  int loadfont_main(int argc UNUSED_PARAM, char **argv)
  {
  	size_t len;
  	unsigned char *buffer;
  
  	// no arguments allowed!
  	opt_complementary = "=0";
  	getopt32(argv, "");
  
  	/*
  	 * We used to look at the length of the input file
  	 * with stat(); now that we accept compressed files,
  	 * just read the entire file.
  	 */
  	len = 32*1024; // can't be larger
  	buffer = xmalloc_read(STDIN_FILENO, &len);
  	// xmalloc_open_zipped_read_close(filename, &len);
  	if (!buffer)
  		bb_perror_msg_and_die("error reading input font");
  	do_load(get_console_fd_or_die(), buffer, len);
  
  	return EXIT_SUCCESS;
  }
  #endif
  
  #if ENABLE_SETFONT
  
  /*
  kbd-1.12:
  
  setfont [-O font+umap.orig] [-o font.orig] [-om cmap.orig]
  [-ou umap.orig] [-N] [font.new ...] [-m cmap] [-u umap] [-C console]
  [-hNN] [-v] [-V]
  
  -h NN  Override font height
  -o file
         Save previous font in file
  -O file
         Save previous font and Unicode map in file
  -om file
         Store console map in file
  -ou file
         Save previous Unicode map in file
  -m file
         Load console map or Unicode console map from file
  -u file
         Load Unicode table describing the font from file
         Example:
         # cp866
         0x00-0x7f       idem
         #
         0x80    U+0410  # CYRILLIC CAPITAL LETTER A
         0x81    U+0411  # CYRILLIC CAPITAL LETTER BE
         0x82    U+0412  # CYRILLIC CAPITAL LETTER VE
  -C console
         Set the font for the indicated console
  -v     Verbose
  -V     Version
  */
  
  #if ENABLE_FEATURE_SETFONT_TEXTUAL_MAP
  static int ctoi(char *s)
  {
  	if (s[0] == '\'' && s[1] != '\0' && s[2] == '\'' && s[3] == '\0')
  		return s[1];
  	// U+ means 0x
  	if (s[0] == 'U' && s[1] == '+') {
  		s[0] = '0';
  		s[1] = 'x';
  	}
  	if (!isdigit(s[0]))
  		return -1;
  	return xstrtoul(s, 0);
  }
  #endif
  
  int setfont_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  int setfont_main(int argc UNUSED_PARAM, char **argv)
  {
  	size_t len;
  	unsigned opts;
  	int fd;
  	unsigned char *buffer;
  	char *mapfilename;
  	const char *tty_name = CURRENT_TTY;
  
  	opt_complementary = "=1";
  	opts = getopt32(argv, "m:C:", &mapfilename, &tty_name);
  	argv += optind;
  
  	fd = xopen_nonblocking(tty_name);
  
  	if (sizeof(CONFIG_DEFAULT_SETFONT_DIR) > 1) { // if not ""
  		if (*argv[0] != '/') {
  			// goto default fonts location. don't die if doesn't exist
  			chdir(CONFIG_DEFAULT_SETFONT_DIR "/consolefonts");
  		}
  	}
  	// load font
  	len = 32*1024; // can't be larger
  	buffer = xmalloc_open_zipped_read_close(*argv, &len);
  	if (!buffer)
  		bb_simple_perror_msg_and_die(*argv);
  	do_load(fd, buffer, len);
  
  	// load the screen map, if any
  	if (opts & 1) { // -m
  		unsigned mode = PIO_SCRNMAP;
  		void *map;
  
  		if (sizeof(CONFIG_DEFAULT_SETFONT_DIR) > 1) { // if not ""
  			if (mapfilename[0] != '/') {
  				// goto default keymaps location
  				chdir(CONFIG_DEFAULT_SETFONT_DIR "/consoletrans");
  			}
  		}
  		// fetch keymap
  		map = xmalloc_open_zipped_read_close(mapfilename, &len);
  		if (!map)
  			bb_simple_perror_msg_and_die(mapfilename);
  		// file size is 256 or 512 bytes? -> assume binary map
  		if (len == E_TABSZ || len == 2*E_TABSZ) {
  			if (len == 2*E_TABSZ)
  				mode = PIO_UNISCRNMAP;
  		}
  #if ENABLE_FEATURE_SETFONT_TEXTUAL_MAP
  		// assume textual Unicode console maps:
  		// 0x00 U+0000  #  NULL (NUL)
  		// 0x01 U+0001  #  START OF HEADING (SOH)
  		// 0x02 U+0002  #  START OF TEXT (STX)
  		// 0x03 U+0003  #  END OF TEXT (ETX)
  		else {
  			int i;
  			char *token[2];
  			parser_t *parser;
  
  			if (ENABLE_FEATURE_CLEAN_UP)
  				free(map);
  			map = xmalloc(E_TABSZ * sizeof(unsigned short));
  
  #define unicodes ((unsigned short *)map)
  			// fill vanilla map
  			for (i = 0; i < E_TABSZ; i++)
  				unicodes[i] = 0xf000 + i;
  
  			parser = config_open(mapfilename);
  			while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL | PARSE_MIN_DIE)) {
  				// parse code/value pair
  				int a = ctoi(token[0]);
  				int b = ctoi(token[1]);
  				if (a < 0 || a >= E_TABSZ
  				 || b < 0 || b > 65535
  				) {
  					bb_error_msg_and_die("map format");
  				}
  				// patch map
  				unicodes[a] = b;
  				// unicode character is met?
  				if (b > 255)
  					mode = PIO_UNISCRNMAP;
  			}
  			if (ENABLE_FEATURE_CLEAN_UP)
  				config_close(parser);
  
  			if (mode != PIO_UNISCRNMAP) {
  #define asciis ((unsigned char *)map)
  				for (i = 0; i < E_TABSZ; i++)
  					asciis[i] = unicodes[i];
  #undef asciis
  			}
  #undef unicodes
  		}
  #endif // ENABLE_FEATURE_SETFONT_TEXTUAL_MAP
  
  		// do set screen map
  		xioctl(fd, mode, map);
  
  		if (ENABLE_FEATURE_CLEAN_UP)
  			free(map);
  	}
  
  	return EXIT_SUCCESS;
  }
  #endif
  