kc.c

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#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include "hdr.h"

struct bmphdr *hdr;
unsigned char *bitmap;
char buf[2048], crlf[2] = { 0x0d, 0x0a };

int main(int argc, char *argv[])
{
	int i, j, k, nr_pixels;
 	FILE *fp, *fpnew;
	
	if (argc != 3) {
		printf("Usage: %s <file_from> <file_to>\n", argv[0]);
		exit(1);
	}
	
	hdr = get_header(argv[1]);

	if (!hdr) exit(1);

	fp = fopen(argv[1], "rb");
	
	if (!fp) {
		printf("File open error!\n");
		exit(1);
	}

	fseek(fp, hdr->offset, SEEK_SET);
	nr_pixels = hdr->width * hdr->height;
	bitmap = malloc(nr_pixels);
	fread(bitmap, nr_pixels, 1, fp);
	fclose(fp);

	for (i = 0; i < nr_pixels; i++)
		if (bitmap[i] < 128)
			bitmap[i] = bitmap[i] * 2;
		else 
			bitmap[i] = 255;
		
	
	fpnew = fopen(argv[2], "wb+");
	
	if (!fpnew) {
		printf("File create error!\n");
		exit(1);
	}

	fwrite(hdr->signature, 2, 1, fpnew);
	fwrite(&hdr->size, 4, 1, fpnew);
	fwrite(hdr->reserved, 4, 1, fpnew);
	fwrite(&hdr->offset, 4, 1, fpnew);
	fwrite(&hdr->hdr_size, 4, 1, fpnew);
	fwrite(&hdr->width, 4, 1, fpnew);
	fwrite(&hdr->height, 4, 1, fpnew);
	fwrite(&hdr->nr_planes, 2, 1, fpnew);
	fwrite(&hdr->bits_per_pixel, 2, 1, fpnew);
	fwrite(&hdr->compress_type, 4, 1, fpnew);
	fwrite(&hdr->data_size, 4, 1, fpnew);
	fwrite(&hdr->resol_hori, 4, 1, fpnew);
	fwrite(&hdr->resol_vert, 4, 1, fpnew);
	fwrite(&hdr->nr_colors, 4, 1, fpnew);
	fwrite(&hdr->important_color, 4, 1, fpnew);
	if (hdr->offset > 54)
		fwrite(hdr->info, hdr->offset - 54, 1, fpnew);
	fwrite(bitmap, nr_pixels, 1, fpnew);
	
	fclose(fpnew);
	free(hdr);
	free(bitmap);

	return 0;
}