【基于C语言的CRC校验小工具】

背景：需要根据一个指定的CRC算法对二进制bin文件进行checksum计算，输出计算结果。
话不多说，上代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef unsigned char u8;
typedef unsigned long int u32;

unsigned long int api_calc_chksum(unsigned char* array,unsigned int len);
u32 GetBinSize(char *filename);
u8 read_bin(char *path, u8 *buf, u32 size);
void write_crc(u32 crc_chksum);

void print_help() {
    printf("Usage: CRC_tool.exe --input filename\n");
    printf("filename: .bin file name or absolute path of file.\n");
}

int main(int argc, char *argv[])
{
	if (argc < 2)
	{
        print_help();
        return 1;
    }
	else if (strcmp(argv[1], "--input") == 0)
	{
		unsigned long int crcSum;
		unsigned char security_id[4] = {0x4D,0x43,0x55,0x52};
		char *edid_data;
		unsigned int size=0;
		unsigned char* filename = argv[2];

		size=GetBinSize(filename);
		edid_data = (char *)malloc(size);

		//读取bin文件
		if(read_bin(filename, edid_data,size)==0)
		{
			printf("read bin completely!\n");
			crcSum = api_calc_chksum(security_id,4);
			crcSum += api_calc_chksum(edid_data, size);
			printf("CheckSum: %x ",crcSum);

			//写入checksum到txt文件
			write_crc(crcSum);
			return EXIT_SUCCESS;
		}
	}
	else
	{
		printf("Unknown option: %s\n", argv[1]);
		print_help();
	}
}

unsigned long int api_calc_chksum(unsigned char* array,unsigned int len)
{
	unsigned int i,j;
	unsigned long int temp,ret;
	unsigned char* ptr;

	ret = 0;
 	ptr = array;
	i = len>>2;
 	temp = 0;
	for(j=0;j<i;j++)
	{
 		temp = ptr[0];
 		temp = temp<<8 | ptr[1];
	 	temp = temp<<8 | ptr[2];
	 	temp = temp<<8 | ptr[3];

 		ret += temp;
		ptr += 4;
 	}

 	i = len & 0x03;
	temp = 0;
	switch(i)
 	{
 		case 0:
 			break;
 		case 1:
 			temp = ptr[0];
 			temp = temp<<24;
	 		break;
	 	case 2:
 			temp = ptr[0];
 			temp = temp<<8 | ptr[1];
		 	temp = temp<<16;
		 	break;
	 	case 3:
 			temp = ptr[0];
 			temp = temp<<8 | ptr[1];
			temp = temp<<8 | ptr[2];
	 		temp = temp<<8;
 			break;
		default:
			break;
	}
	ret += temp;
	return ret;
}

u32 GetBinSize(char *filename)
{
    u32  siz = 0;
    FILE  *fp = fopen(filename, "rb");
    if (fp)
    {
        fseek(fp, 0, SEEK_END);
        siz = ftell(fp);
        fclose(fp);
    }
    printf("filename=%s,size=%d \n",filename,siz);
    return siz;
}

u8 read_bin(char *path, u8 *buf, u32 size)
{
    FILE *infile;

    if((infile=fopen(path,"rb"))==NULL)
    {
        printf( "\nCan not open the path: %s \n", path);
        perror("Failed to open file");
		return 1;
    }
    fread(buf, sizeof(u8), size, infile);
    fclose(infile);
	return 0;
}

void write_crc(u32 crc_chksum)
{
	 // 打开一个文件用于写入
    FILE *file = fopen("checksum.txt", "w");
    if (file == NULL) {
        perror("无法打开文件");
    }

    // 将数据写入文件
    fprintf(file, "%lx\n", crc_chksum);

    // 关闭文件
    fclose(file);
}

可以通过minGW工具把这个.c文件转成.exe直接运行。
minGW下载：https://blog.youkuaiyun.com/weixin_64064486/article/details/123940266

安装好minGW-后，
gcc test_ok.c -o crc_tool.exe