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Diffstat (limited to 'lib/shell')

0 files changed, 0 insertions, 0 deletions

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#include <stdio.h>
#include <stdlib.h>

#if defined(__linux__)
#include <stdint.h>
#else
#ifdef __CYGWIN__
#include "elf.h"
#else
#include <inttypes.h>
#endif
#endif

typedef struct bitmap_s {		/* bitmap description */
	uint16_t width;
	uint16_t height;
	uint8_t	palette[256*3];
	uint8_t	*data;
} bitmap_t;

#define DEFAULT_CMAP_SIZE	16	/* size of default color map	*/

/*
 * Neutralize little endians.
 */
uint16_t le_short(uint16_t x)
{
    uint16_t val;
    uint8_t *p = (uint8_t *)(&x);

    val =  (*p++ & 0xff) << 0;
    val |= (*p & 0xff) << 8;

    return val;
}

void skip_bytes (FILE *fp, int n)
{
	while (n-- > 0)
		fgetc (fp);
}

int main (int argc, char *argv[])
{
	int	i, x;
	FILE	*fp;
	bitmap_t bmp;
	bitmap_t *b = &bmp;
	uint16_t data_offset, n_colors;

	if (argc < 2) {
		fprintf (stderr, "Usage: %s file\n", argv[0]);
		exit (EXIT_FAILURE);
	}

	if ((fp = fopen (argv[1], "rb")) == NULL) {
		perror (argv[1]);
		exit (EXIT_FAILURE);
	}

	if (fgetc (fp) != 'B' || fgetc (fp) != 'M') {
		fprintf (stderr, "%s is not a bitmap file.\n", argv[1]);
		exit (EXIT_FAILURE);
	}

	/*
	 * read width and height of the image, and the number of colors used;
	 * ignore the rest
	 */
	skip_bytes (fp, 8);
	fread (&data_offset, sizeof (uint16_t), 1, fp);
	skip_bytes (fp, 6);
	fread (&b->width,   sizeof (uint16_t), 1, fp);
	skip_bytes (fp, 2);
	fread (&b->height,  sizeof (uint16_t), 1, fp);
	skip_bytes (fp, 22);
	fread (&n_colors, sizeof (uint16_t), 1, fp);
	skip_bytes (fp, 6);

	/*
	 * Repair endianess.
	 */
	data_offset = le_short(data_offset);


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