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/*
 *  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 */