scripts/pnmtologo.c - third_party/linux - Git at Google


 /*
  *  Convert a logo in ASCII PNM format to C source suitable for inclusion in
  *  the Linux kernel
  *
  *  (C) Copyright 2001-2003 by Geert Uytterhoeven <geert@linux-m68k.org>
  *
  *  --------------------------------------------------------------------------
  *
  *  This file is subject to the terms and conditions of the GNU General Public
  *  License. See the file COPYING in the main directory of the Linux
  *  distribution for more details.
  */

 #include <ctype.h>
 #include <errno.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>


 static const char *programname;
 static const char *filename;
 static const char *logoname = "linux_logo";
 static const char *outputname;
 static FILE *out;


 #define LINUX_LOGO_MONO		1	/* monochrome black/white */
 #define LINUX_LOGO_VGA16	2	/* 16 colors VGA text palette */
 #define LINUX_LOGO_CLUT224	3	/* 224 colors */
 #define LINUX_LOGO_GRAY256	4	/* 256 levels grayscale */

 static const char *logo_types[LINUX_LOGO_GRAY256+1] = {
     [LINUX_LOGO_MONO] = "LINUX_LOGO_MONO",
     [LINUX_LOGO_VGA16] = "LINUX_LOGO_VGA16",
     [LINUX_LOGO_CLUT224] = "LINUX_LOGO_CLUT224",
     [LINUX_LOGO_GRAY256] = "LINUX_LOGO_GRAY256"
 };

 #define MAX_LINUX_LOGO_COLORS	224

 struct color {
     unsigned char red;
     unsigned char green;
     unsigned char blue;
 };

 static const struct color clut_vga16[16] = {
     { 0x00, 0x00, 0x00 },
     { 0x00, 0x00, 0xaa },
     { 0x00, 0xaa, 0x00 },
     { 0x00, 0xaa, 0xaa },
     { 0xaa, 0x00, 0x00 },
     { 0xaa, 0x00, 0xaa },
     { 0xaa, 0x55, 0x00 },
     { 0xaa, 0xaa, 0xaa },
     { 0x55, 0x55, 0x55 },
     { 0x55, 0x55, 0xff },
     { 0x55, 0xff, 0x55 },
     { 0x55, 0xff, 0xff },
     { 0xff, 0x55, 0x55 },
     { 0xff, 0x55, 0xff },
     { 0xff, 0xff, 0x55 },
     { 0xff, 0xff, 0xff },
 };


 static int logo_type = LINUX_LOGO_CLUT224;
 static unsigned int logo_width;
 static unsigned int logo_height;
 static struct color **logo_data;
 static struct color logo_clut[MAX_LINUX_LOGO_COLORS];
 static unsigned int logo_clutsize;

 static void die(const char *fmt, ...)
     __attribute__ ((noreturn)) __attribute ((format (printf, 1, 2)));
 static void usage(void) __attribute ((noreturn));


 static unsigned int get_number(FILE *fp)
 {
     int c, val;

     /* Skip leading whitespace */
     do {
 	c = fgetc(fp);
 	if (c == EOF)
 	    die("%s: end of file\n", filename);
 	if (c == '#') {
 	    /* Ignore comments 'till end of line */
 	    do {
 		c = fgetc(fp);
 		if (c == EOF)
 		    die("%s: end of file\n", filename);
 	    } while (c != '\n');
 	}
     } while (isspace(c));

     /* Parse decimal number */
     val = 0;
     while (isdigit(c)) {
 	val = 10*val+c-'0';
 	c = fgetc(fp);
 	if (c == EOF)
 	    die("%s: end of file\n", filename);
     }
     return val;
 }

 static unsigned int get_number255(FILE *fp, unsigned int maxval)
 {
     unsigned int val = get_number(fp);
     return (255*val+maxval/2)/maxval;
 }

 static void read_image(void)
 {
     FILE *fp;
     unsigned int i, j;
     int magic;
     unsigned int maxval;

     /* open image file */
     fp = fopen(filename, "r");
     if (!fp)
 	die("Cannot open file %s: %s\n", filename, strerror(errno));

     /* check file type and read file header */
     magic = fgetc(fp);
     if (magic != 'P')
 	die("%s is not a PNM file\n", filename);
     magic = fgetc(fp);
     switch (magic) {
 	case '1':
 	case '2':
 	case '3':
 	    /* Plain PBM/PGM/PPM */
 	    break;

 	case '4':
 	case '5':
 	case '6':
 	    /* Binary PBM/PGM/PPM */
 	    die("%s: Binary PNM is not supported\n"
 		"Use pnmnoraw(1) to convert it to ASCII PNM\n", filename);

 	default:
 	    die("%s is not a PNM file\n", filename);
     }
     logo_width = get_number(fp);
     logo_height = get_number(fp);

     /* allocate image data */
     logo_data = (struct color **)malloc(logo_height*sizeof(struct color *));
     if (!logo_data)
 	die("%s\n", strerror(errno));
     for (i = 0; i < logo_height; i++) {
 	logo_data[i] = malloc(logo_width*sizeof(struct color));
 	if (!logo_data[i])
 	    die("%s\n", strerror(errno));
     }

     /* read image data */
     switch (magic) {
 	case '1':
 	    /* Plain PBM */
 	    for (i = 0; i < logo_height; i++)
 		for (j = 0; j < logo_width; j++)
 		    logo_data[i][j].red = logo_data[i][j].green =
 			logo_data[i][j].blue = 255*(1-get_number(fp));
 	    break;

 	case '2':
 	    /* Plain PGM */
 	    maxval = get_number(fp);
 	    for (i = 0; i < logo_height; i++)
 		for (j = 0; j < logo_width; j++)
 		    logo_data[i][j].red = logo_data[i][j].green =
 			logo_data[i][j].blue = get_number255(fp, maxval);
 	    break;

 	case '3':
 	    /* Plain PPM */
 	    maxval = get_number(fp);
 	    for (i = 0; i < logo_height; i++)
 		for (j = 0; j < logo_width; j++) {
 		    logo_data[i][j].red = get_number255(fp, maxval);
 		    logo_data[i][j].green = get_number255(fp, maxval);
 		    logo_data[i][j].blue = get_number255(fp, maxval);
 		}
 	    break;
     }

     /* close file */
     fclose(fp);
 }

 static inline int is_black(struct color c)
 {
     return c.red == 0 && c.green == 0 && c.blue == 0;
 }

 static inline int is_white(struct color c)
 {
     return c.red == 255 && c.green == 255 && c.blue == 255;
 }

 static inline int is_gray(struct color c)
 {
     return c.red == c.green && c.red == c.blue;
 }

 static inline int is_equal(struct color c1, struct color c2)
 {
     return c1.red == c2.red && c1.green == c2.green && c1.blue == c2.blue;
 }

 static void write_header(void)
 {
     /* open logo file */
     if (outputname) {
 	out = fopen(outputname, "w");
 	if (!out)
 	    die("Cannot create file %s: %s\n", outputname, strerror(errno));
     } else {
 	out = stdout;
     }

     fputs("/*\n", out);
     fputs(" *  DO NOT EDIT THIS FILE!\n", out);
     fputs(" *\n", out);
     fprintf(out, " *  It was automatically generated from %s\n", filename);
     fputs(" *\n", out);
     fprintf(out, " *  Linux logo %s\n", logoname);
     fputs(" */\n\n", out);
     fputs("#include <linux/linux_logo.h>\n\n", out);
     fprintf(out, "static unsigned char %s_data[] __initdata = {\n",
 	    logoname);
 }

 static void write_footer(void)
 {
     fputs("\n};\n\n", out);
     fprintf(out, "const struct linux_logo %s __initconst = {\n", logoname);
     fprintf(out, "\t.type\t\t= %s,\n", logo_types[logo_type]);
     fprintf(out, "\t.width\t\t= %d,\n", logo_width);
     fprintf(out, "\t.height\t\t= %d,\n", logo_height);
     if (logo_type == LINUX_LOGO_CLUT224) {
 	fprintf(out, "\t.clutsize\t= %d,\n", logo_clutsize);
 	fprintf(out, "\t.clut\t\t= %s_clut,\n", logoname);
     }
     fprintf(out, "\t.data\t\t= %s_data\n", logoname);
     fputs("};\n\n", out);

     /* close logo file */
     if (outputname)
 	fclose(out);
 }

 static int write_hex_cnt;

 static void write_hex(unsigned char byte)
 {
     if (write_hex_cnt % 12)
 	fprintf(out, ", 0x%02x", byte);
     else if (write_hex_cnt)
 	fprintf(out, ",\n\t0x%02x", byte);
     else
 	fprintf(out, "\t0x%02x", byte);
     write_hex_cnt++;
 }

 static void write_logo_mono(void)
 {
     unsigned int i, j;
     unsigned char val, bit;

     /* validate image */
     for (i = 0; i < logo_height; i++)
 	for (j = 0; j < logo_width; j++)
 	    if (!is_black(logo_data[i][j]) && !is_white(logo_data[i][j]))
 		die("Image must be monochrome\n");

     /* write file header */
     write_header();

     /* write logo data */
     for (i = 0; i < logo_height; i++) {
 	for (j = 0; j < logo_width;) {
 	    for (val = 0, bit = 0x80; bit && j < logo_width; j++, bit >>= 1)
 		if (logo_data[i][j].red)
 		    val |= bit;
 	    write_hex(val);
 	}
     }

     /* write logo structure and file footer */
     write_footer();
 }

 static void write_logo_vga16(void)
 {
     unsigned int i, j, k;
     unsigned char val;

     /* validate image */
     for (i = 0; i < logo_height; i++)
 	for (j = 0; j < logo_width; j++) {
 	    for (k = 0; k < 16; k++)
 		if (is_equal(logo_data[i][j], clut_vga16[k]))
 		    break;
 	    if (k == 16)
 		die("Image must use the 16 console colors only\n"
 		    "Use ppmquant(1) -map clut_vga16.ppm to reduce the number "
 		    "of colors\n");
 	}

     /* write file header */
     write_header();

     /* write logo data */
     for (i = 0; i < logo_height; i++)
 	for (j = 0; j < logo_width; j++) {
 	    for (k = 0; k < 16; k++)
 		if (is_equal(logo_data[i][j], clut_vga16[k]))
 		    break;
 	    val = k<<4;
 	    if (++j < logo_width) {
 		for (k = 0; k < 16; k++)
 		    if (is_equal(logo_data[i][j], clut_vga16[k]))
 			break;
 		val |= k;
 	    }
 	    write_hex(val);
 	}

     /* write logo structure and file footer */
     write_footer();
 }

 static void write_logo_clut224(void)
 {
     unsigned int i, j, k;

     /* validate image */
     for (i = 0; i < logo_height; i++)
 	for (j = 0; j < logo_width; j++) {
 	    for (k = 0; k < logo_clutsize; k++)
 		if (is_equal(logo_data[i][j], logo_clut[k]))
 		    break;
 	    if (k == logo_clutsize) {
 		if (logo_clutsize == MAX_LINUX_LOGO_COLORS)
 		    die("Image has more than %d colors\n"
 			"Use ppmquant(1) to reduce the number of colors\n",
 			MAX_LINUX_LOGO_COLORS);
 		logo_clut[logo_clutsize++] = logo_data[i][j];
 	    }
 	}

     /* write file header */
     write_header();

     /* write logo data */
     for (i = 0; i < logo_height; i++)
 	for (j = 0; j < logo_width; j++) {
 	    for (k = 0; k < logo_clutsize; k++)
 		if (is_equal(logo_data[i][j], logo_clut[k]))
 		    break;
 	    write_hex(k+32);
 	}
     fputs("\n};\n\n", out);

     /* write logo clut */
     fprintf(out, "static unsigned char %s_clut[] __initdata = {\n",
 	    logoname);
     write_hex_cnt = 0;
     for (i = 0; i < logo_clutsize; i++) {
 	write_hex(logo_clut[i].red);
 	write_hex(logo_clut[i].green);
 	write_hex(logo_clut[i].blue);
     }

     /* write logo structure and file footer */
     write_footer();
 }

 static void write_logo_gray256(void)
 {
     unsigned int i, j;

     /* validate image */
     for (i = 0; i < logo_height; i++)
 	for (j = 0; j < logo_width; j++)
 	    if (!is_gray(logo_data[i][j]))
 		die("Image must be grayscale\n");

     /* write file header */
     write_header();

     /* write logo data */
     for (i = 0; i < logo_height; i++)
 	for (j = 0; j < logo_width; j++)
 	    write_hex(logo_data[i][j].red);

     /* write logo structure and file footer */
     write_footer();
 }

 static void die(const char *fmt, ...)
 {
     va_list ap;

     va_start(ap, fmt);
     vfprintf(stderr, fmt, ap);
     va_end(ap);

     exit(1);
 }

 static void usage(void)
 {
     die("\n"
 	"Usage: %s [options] <filename>\n"
 	"\n"
 	"Valid options:\n"
 	"    -h          : display this usage information\n"
 	"    -n <name>   : specify logo name (default: linux_logo)\n"
 	"    -o <output> : output to file <output> instead of stdout\n"
 	"    -t <type>   : specify logo type, one of\n"
 	"                      mono    : monochrome black/white\n"
 	"                      vga16   : 16 colors VGA text palette\n"
 	"                      clut224 : 224 colors (default)\n"
 	"                      gray256 : 256 levels grayscale\n"
 	"\n", programname);
 }

 int main(int argc, char *argv[])
 {
     int opt;

     programname = argv[0];

     opterr = 0;
     while (1) {
 	opt = getopt(argc, argv, "hn:o:t:");
 	if (opt == -1)
 	    break;

 	switch (opt) {
 	    case 'h':
 		usage();
 		break;

 	    case 'n':
 		logoname = optarg;
 		break;

 	    case 'o':
 		outputname = optarg;
 		break;

 	    case 't':
 		if (!strcmp(optarg, "mono"))
 		    logo_type = LINUX_LOGO_MONO;
 		else if (!strcmp(optarg, "vga16"))
 		    logo_type = LINUX_LOGO_VGA16;
 		else if (!strcmp(optarg, "clut224"))
 		    logo_type = LINUX_LOGO_CLUT224;
 		else if (!strcmp(optarg, "gray256"))
 		    logo_type = LINUX_LOGO_GRAY256;
 		else
 		    usage();
 		break;

 	    default:
 		usage();
 		break;
 	}
     }
     if (optind != argc-1)
 	usage();

     filename = argv[optind];

     read_image();
     switch (logo_type) {
 	case LINUX_LOGO_MONO:
 	    write_logo_mono();
 	    break;

 	case LINUX_LOGO_VGA16:
 	    write_logo_vga16();
 	    break;

 	case LINUX_LOGO_CLUT224:
 	    write_logo_clut224();
 	    break;

 	case LINUX_LOGO_GRAY256:
 	    write_logo_gray256();
 	    break;
     }
     exit(0);
 }

	/*
	* Convert a logo in ASCII PNM format to C source suitable for inclusion in
	* the Linux kernel
	*
	* (C) Copyright 2001-2003 by Geert Uytterhoeven <geert@linux-m68k.org>
	*
	* --------------------------------------------------------------------------
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file COPYING in the main directory of the Linux
	* distribution for more details.
	*/

	#include <ctype.h>
	#include <errno.h>
	#include <stdarg.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>


	static const char *programname;
	static const char *filename;
	static const char *logoname = "linux_logo";
	static const char *outputname;
	static FILE *out;


	#define LINUX_LOGO_MONO 1 /* monochrome black/white */
	#define LINUX_LOGO_VGA16 2 /* 16 colors VGA text palette */
	#define LINUX_LOGO_CLUT224 3 /* 224 colors */
	#define LINUX_LOGO_GRAY256 4 /* 256 levels grayscale */

	static const char *logo_types[LINUX_LOGO_GRAY256+1] = {
	[LINUX_LOGO_MONO] = "LINUX_LOGO_MONO",
	[LINUX_LOGO_VGA16] = "LINUX_LOGO_VGA16",
	[LINUX_LOGO_CLUT224] = "LINUX_LOGO_CLUT224",
	[LINUX_LOGO_GRAY256] = "LINUX_LOGO_GRAY256"
	};

	#define MAX_LINUX_LOGO_COLORS 224

	struct color {
	unsigned char red;
	unsigned char green;
	unsigned char blue;
	};

	static const struct color clut_vga16[16] = {
	{ 0x00, 0x00, 0x00 },
	{ 0x00, 0x00, 0xaa },
	{ 0x00, 0xaa, 0x00 },
	{ 0x00, 0xaa, 0xaa },
	{ 0xaa, 0x00, 0x00 },
	{ 0xaa, 0x00, 0xaa },
	{ 0xaa, 0x55, 0x00 },
	{ 0xaa, 0xaa, 0xaa },
	{ 0x55, 0x55, 0x55 },
	{ 0x55, 0x55, 0xff },
	{ 0x55, 0xff, 0x55 },
	{ 0x55, 0xff, 0xff },
	{ 0xff, 0x55, 0x55 },
	{ 0xff, 0x55, 0xff },
	{ 0xff, 0xff, 0x55 },
	{ 0xff, 0xff, 0xff },
	};


	static int logo_type = LINUX_LOGO_CLUT224;
	static unsigned int logo_width;
	static unsigned int logo_height;
	static struct color **logo_data;
	static struct color logo_clut[MAX_LINUX_LOGO_COLORS];
	static unsigned int logo_clutsize;

	static void die(const char *fmt, ...)
	__attribute__ ((noreturn)) __attribute ((format (printf, 1, 2)));
	static void usage(void) __attribute ((noreturn));


	static unsigned int get_number(FILE *fp)
	{
	int c, val;

	/* Skip leading whitespace */
	do {
	c = fgetc(fp);
	if (c == EOF)
	die("%s: end of file\n", filename);
	if (c == '#') {
	/* Ignore comments 'till end of line */
	do {
	c = fgetc(fp);
	if (c == EOF)
	die("%s: end of file\n", filename);
	} while (c != '\n');
	}
	} while (isspace(c));

	/* Parse decimal number */
	val = 0;
	while (isdigit(c)) {
	val = 10*val+c-'0';
	c = fgetc(fp);
	if (c == EOF)
	die("%s: end of file\n", filename);
	}
	return val;
	}

	static unsigned int get_number255(FILE *fp, unsigned int maxval)
	{
	unsigned int val = get_number(fp);
	return (255*val+maxval/2)/maxval;
	}

	static void read_image(void)
	{
	FILE *fp;
	unsigned int i, j;
	int magic;
	unsigned int maxval;

	/* open image file */
	fp = fopen(filename, "r");
	if (!fp)
	die("Cannot open file %s: %s\n", filename, strerror(errno));

	/* check file type and read file header */
	magic = fgetc(fp);
	if (magic != 'P')
	die("%s is not a PNM file\n", filename);
	magic = fgetc(fp);
	switch (magic) {
	case '1':
	case '2':
	case '3':
	/* Plain PBM/PGM/PPM */
	break;

	case '4':
	case '5':
	case '6':
	/* Binary PBM/PGM/PPM */
	die("%s: Binary PNM is not supported\n"
	"Use pnmnoraw(1) to convert it to ASCII PNM\n", filename);

	default:
	die("%s is not a PNM file\n", filename);
	}
	logo_width = get_number(fp);
	logo_height = get_number(fp);

	/* allocate image data */
	logo_data = (struct color *)malloc(logo_heightsizeof(struct color *));
	if (!logo_data)
	die("%s\n", strerror(errno));
	for (i = 0; i < logo_height; i++) {
	logo_data[i] = malloc(logo_width*sizeof(struct color));
	if (!logo_data[i])
	die("%s\n", strerror(errno));
	}

	/* read image data */
	switch (magic) {
	case '1':
	/* Plain PBM */
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++)
	logo_data[i][j].red = logo_data[i][j].green =
	logo_data[i][j].blue = 255*(1-get_number(fp));
	break;

	case '2':
	/* Plain PGM */
	maxval = get_number(fp);
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++)
	logo_data[i][j].red = logo_data[i][j].green =
	logo_data[i][j].blue = get_number255(fp, maxval);
	break;

	case '3':
	/* Plain PPM */
	maxval = get_number(fp);
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++) {
	logo_data[i][j].red = get_number255(fp, maxval);
	logo_data[i][j].green = get_number255(fp, maxval);
	logo_data[i][j].blue = get_number255(fp, maxval);
	}
	break;
	}

	/* close file */
	fclose(fp);
	}

	static inline int is_black(struct color c)
	{
	return c.red == 0 && c.green == 0 && c.blue == 0;
	}

	static inline int is_white(struct color c)
	{
	return c.red == 255 && c.green == 255 && c.blue == 255;
	}

	static inline int is_gray(struct color c)
	{
	return c.red == c.green && c.red == c.blue;
	}

	static inline int is_equal(struct color c1, struct color c2)
	{
	return c1.red == c2.red && c1.green == c2.green && c1.blue == c2.blue;
	}

	static void write_header(void)
	{
	/* open logo file */
	if (outputname) {
	out = fopen(outputname, "w");
	if (!out)
	die("Cannot create file %s: %s\n", outputname, strerror(errno));
	} else {
	out = stdout;
	}

	fputs("/*\n", out);
	fputs(" * DO NOT EDIT THIS FILE!\n", out);
	fputs(" *\n", out);
	fprintf(out, " * It was automatically generated from %s\n", filename);
	fputs(" *\n", out);
	fprintf(out, " * Linux logo %s\n", logoname);
	fputs(" */\n\n", out);
	fputs("#include <linux/linux_logo.h>\n\n", out);
	fprintf(out, "static unsigned char %s_data[] __initdata = {\n",
	logoname);
	}

	static void write_footer(void)
	{
	fputs("\n};\n\n", out);
	fprintf(out, "const struct linux_logo %s __initconst = {\n", logoname);
	fprintf(out, "\t.type\t\t= %s,\n", logo_types[logo_type]);
	fprintf(out, "\t.width\t\t= %d,\n", logo_width);
	fprintf(out, "\t.height\t\t= %d,\n", logo_height);
	if (logo_type == LINUX_LOGO_CLUT224) {
	fprintf(out, "\t.clutsize\t= %d,\n", logo_clutsize);
	fprintf(out, "\t.clut\t\t= %s_clut,\n", logoname);
	}
	fprintf(out, "\t.data\t\t= %s_data\n", logoname);
	fputs("};\n\n", out);

	/* close logo file */
	if (outputname)
	fclose(out);
	}

	static int write_hex_cnt;

	static void write_hex(unsigned char byte)
	{
	if (write_hex_cnt % 12)
	fprintf(out, ", 0x%02x", byte);
	else if (write_hex_cnt)
	fprintf(out, ",\n\t0x%02x", byte);
	else
	fprintf(out, "\t0x%02x", byte);
	write_hex_cnt++;
	}

	static void write_logo_mono(void)
	{
	unsigned int i, j;
	unsigned char val, bit;

	/* validate image */
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++)
	if (!is_black(logo_data[i][j]) && !is_white(logo_data[i][j]))
	die("Image must be monochrome\n");

	/* write file header */
	write_header();

	/* write logo data */
	for (i = 0; i < logo_height; i++) {
	for (j = 0; j < logo_width;) {
	for (val = 0, bit = 0x80; bit && j < logo_width; j++, bit >>= 1)
	if (logo_data[i][j].red)
	val \|= bit;
	write_hex(val);
	}
	}

	/* write logo structure and file footer */
	write_footer();
	}

	static void write_logo_vga16(void)
	{
	unsigned int i, j, k;
	unsigned char val;

	/* validate image */
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++) {
	for (k = 0; k < 16; k++)
	if (is_equal(logo_data[i][j], clut_vga16[k]))
	break;
	if (k == 16)
	die("Image must use the 16 console colors only\n"
	"Use ppmquant(1) -map clut_vga16.ppm to reduce the number "
	"of colors\n");
	}

	/* write file header */
	write_header();

	/* write logo data */
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++) {
	for (k = 0; k < 16; k++)
	if (is_equal(logo_data[i][j], clut_vga16[k]))
	break;
	val = k<<4;
	if (++j < logo_width) {
	for (k = 0; k < 16; k++)
	if (is_equal(logo_data[i][j], clut_vga16[k]))
	break;
	val \|= k;
	}
	write_hex(val);
	}

	/* write logo structure and file footer */
	write_footer();
	}

	static void write_logo_clut224(void)
	{
	unsigned int i, j, k;

	/* validate image */
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++) {
	for (k = 0; k < logo_clutsize; k++)
	if (is_equal(logo_data[i][j], logo_clut[k]))
	break;
	if (k == logo_clutsize) {
	if (logo_clutsize == MAX_LINUX_LOGO_COLORS)
	die("Image has more than %d colors\n"
	"Use ppmquant(1) to reduce the number of colors\n",
	MAX_LINUX_LOGO_COLORS);
	logo_clut[logo_clutsize++] = logo_data[i][j];
	}
	}

	/* write file header */
	write_header();

	/* write logo data */
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++) {
	for (k = 0; k < logo_clutsize; k++)
	if (is_equal(logo_data[i][j], logo_clut[k]))
	break;
	write_hex(k+32);
	}
	fputs("\n};\n\n", out);

	/* write logo clut */
	fprintf(out, "static unsigned char %s_clut[] __initdata = {\n",
	logoname);
	write_hex_cnt = 0;
	for (i = 0; i < logo_clutsize; i++) {
	write_hex(logo_clut[i].red);
	write_hex(logo_clut[i].green);
	write_hex(logo_clut[i].blue);
	}

	/* write logo structure and file footer */
	write_footer();
	}

	static void write_logo_gray256(void)
	{
	unsigned int i, j;

	/* validate image */
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++)
	if (!is_gray(logo_data[i][j]))
	die("Image must be grayscale\n");

	/* write file header */
	write_header();

	/* write logo data */
	for (i = 0; i < logo_height; i++)
	for (j = 0; j < logo_width; j++)
	write_hex(logo_data[i][j].red);

	/* write logo structure and file footer */
	write_footer();
	}

	static void die(const char *fmt, ...)
	{
	va_list ap;

	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);

	exit(1);
	}

	static void usage(void)
	{
	die("\n"
	"Usage: %s [options] <filename>\n"
	"\n"
	"Valid options:\n"
	" -h : display this usage information\n"
	" -n <name> : specify logo name (default: linux_logo)\n"
	" -o <output> : output to file <output> instead of stdout\n"
	" -t <type> : specify logo type, one of\n"
	" mono : monochrome black/white\n"
	" vga16 : 16 colors VGA text palette\n"
	" clut224 : 224 colors (default)\n"
	" gray256 : 256 levels grayscale\n"
	"\n", programname);
	}

	int main(int argc, char *argv[])
	{
	int opt;

	programname = argv[0];

	opterr = 0;
	while (1) {
	opt = getopt(argc, argv, "hn:o:t:");
	if (opt == -1)
	break;

	switch (opt) {
	case 'h':
	usage();
	break;

	case 'n':
	logoname = optarg;
	break;

	case 'o':
	outputname = optarg;
	break;

	case 't':
	if (!strcmp(optarg, "mono"))
	logo_type = LINUX_LOGO_MONO;
	else if (!strcmp(optarg, "vga16"))
	logo_type = LINUX_LOGO_VGA16;
	else if (!strcmp(optarg, "clut224"))
	logo_type = LINUX_LOGO_CLUT224;
	else if (!strcmp(optarg, "gray256"))
	logo_type = LINUX_LOGO_GRAY256;
	else
	usage();
	break;

	default:
	usage();
	break;
	}
	}
	if (optind != argc-1)
	usage();

	filename = argv[optind];

	read_image();
	switch (logo_type) {
	case LINUX_LOGO_MONO:
	write_logo_mono();
	break;

	case LINUX_LOGO_VGA16:
	write_logo_vga16();
	break;

	case LINUX_LOGO_CLUT224:
	write_logo_clut224();
	break;

	case LINUX_LOGO_GRAY256:
	write_logo_gray256();
	break;
	}
	exit(0);
	}