hdr.c

来自「source 为程序源代码文件目录 exe 为可执行文件目录 pics 为所」· C语言 代码 · 共 43 行

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

struct bmphdr *get_header(char filename[])
{
	FILE *fp;
	struct bmphdr *hdr;
  		
	fp = fopen(filename, "rb");
	if (!fp) {
		printf("File open error or such file does not exist!\n");
		return NULL;	
	}
	
	hdr = (struct bmphdr *)malloc(sizeof(struct bmphdr));
	fread(hdr->signature, 2, 1, fp);
	if (hdr->signature[0] != 'B' || hdr->signature[1] != 'M') {
		printf("Not a bmp file!\n");
		return NULL;
	}
	
	fread(&hdr->size, 4, 1, fp);
	fread(hdr->reserved, 4, 1, fp);
	fread(&hdr->offset, 4, 1, fp);
	fread(&hdr->hdr_size, 4, 1, fp);
	fread(&hdr->width, 4, 1, fp);
	fread(&hdr->height, 4, 1, fp);
	fread(&hdr->nr_planes, 2, 1, fp);
	fread(&hdr->bits_per_pixel, 2, 1, fp);
	fread(&hdr->compress_type, 4, 1, fp);
	fread(&hdr->data_size, 4, 1, fp);
	fread(&hdr->resol_hori, 4, 1, fp);
	fread(&hdr->resol_vert, 4, 1, fp);
	fread(&hdr->nr_colors, 4, 1, fp);
	fread(&hdr->important_color, 4, 1, fp);
  if (hdr->offset > 54)
		  fread(&hdr->info, 1024, 1, fp);
  
  fclose(fp);
	return hdr;	
}