noise.c

source 为程序源代码文件目录 exe 为可执行文件目录 pics 为所有处理好的图片的目录 需要预先安装MinGW MinGW为Mini Gnu for Windows 里面包含gcc

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

struct bmphdr *hdr;
unsigned char *bitmap;

int main(int argc, char *argv[])
{
	int i, j, k, nr_pixels;
  FILE *fp, *fpnew;
	
	if (argc != 4) {
		printf("Usage: %s <file_from> <file_to> <nr_noise>\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);

  srand(k);
  k = atoi(argv[3]);
	for (i = 0; i < k; i++) {
		j = rand() * rand() % nr_pixels;
		bitmap[j] = 0xff;
	}
			
	fpnew = fopen(argv[2], "wb+");
	
	if (fpnew < 0) {
		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;
}