将char转成bit，文件读写

好久不写代码，一段将bmp写到mif的小程序花了我好几个小时。以后要多练习啊。

#include <string.h>
#include <stdio.h>
#include <math.h>


void main(){
    char str[3];
    char pos_str[5];

    FILE *fp_read;
    fp_read = fopen("pattern_mem.bmp","r");

    FILE *fp_write;
    fp_write = fopen("pattern_rom.mif","w");

    if(fp_write == NULL || fp_read == NULL)
    {
        printf("can't open files!");
        return ;
    }

    char bmp_head[54];
    //读出BMP头，抛弃不要
    fread(bmp_head,sizeof(char)*54,1,fp_read);
    //读出RGB信号，按顺序存入mif文件
    for(int i = 0 ; i< 28800; i++)
    {
        fread(str, 3, 1, fp_read);
        fprintf(fp_write,"%x:",i);

        //这里可能大小端有问题
        int result[24]={0};
        for(int j = 0 ; j < 8; j++)
            result[j] = (str[0] & (0x01 << j))?1:0;  
        for(int m = 0 ; m < 8; m ++)
            result[8+m] = (str[1] & (0x01 << m))?1:0;
        for(int n = 0; n < 8 ; n++)
            result[16+n] = (str[2] & (0x01 << n))?1:0;

        for(int k = 0; k<24; k++)
            fprintf(fp_write, "%d",result[k]);

        fprintf(fp_write,"\n");

    }
    fclose(fp_read);
    fclose(fp_write);

    return ;
}