文件添加32位CRC校驗碼
#include <iostream>
#include <string>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
?
using namespace std;
#define PATH "D://VScode//CRC//calc_crc//CRCTESTFILE.txt"
//#define PATH "H://Edge_download//ZhiyunTrans_setup7.7.3K.exe"
#define KEY ?"W269"
unsigned char crc32_buf[8];
static unsigned int CRCTable[256]={
? ? 0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9, 0x130476DC, 0x17C56B6B, 0x1A864DB2, 0x1E475005,
? ? 0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6, 0x2B4BCB61, 0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD,
? ? 0x4C11DB70, 0x48D0C6C7, 0x4593E01E, 0x4152FDA9, 0x5F15ADAC, 0x5BD4B01B, 0x569796C2, 0x52568B75,
? ? 0x6A1936C8, 0x6ED82B7F, 0x639B0DA6, 0x675A1011, 0x791D4014, 0x7DDC5DA3, 0x709F7B7A, 0x745E66CD,
? ? 0x9823B6E0, 0x9CE2AB57, 0x91A18D8E, 0x95609039, 0x8B27C03C, 0x8FE6DD8B, 0x82A5FB52, 0x8664E6E5,
? ? 0xBE2B5B58, 0xBAEA46EF, 0xB7A96036, 0xB3687D81, 0xAD2F2D84, 0xA9EE3033, 0xA4AD16EA, 0xA06C0B5D,
? ? 0xD4326D90, 0xD0F37027, 0xDDB056FE, 0xD9714B49, 0xC7361B4C, 0xC3F706FB, 0xCEB42022, 0xCA753D95,
? ? 0xF23A8028, 0xF6FB9D9F, 0xFBB8BB46, 0xFF79A6F1, 0xE13EF6F4, 0xE5FFEB43, 0xE8BCCD9A, 0xEC7DD02D,
? ? 0x34867077, 0x30476DC0, 0x3D044B19, 0x39C556AE, 0x278206AB, 0x23431B1C, 0x2E003DC5, 0x2AC12072,
? ? 0x128E9DCF, 0x164F8078, 0x1B0CA6A1, 0x1FCDBB16, 0x018AEB13, 0x054BF6A4, 0x0808D07D, 0x0CC9CDCA,
? ? 0x7897AB07, 0x7C56B6B0, 0x71159069, 0x75D48DDE, 0x6B93DDDB, 0x6F52C06C, 0x6211E6B5, 0x66D0FB02,
? ? 0x5E9F46BF, 0x5A5E5B08, 0x571D7DD1, 0x53DC6066, 0x4D9B3063, 0x495A2DD4, 0x44190B0D, 0x40D816BA,
? ? 0xACA5C697, 0xA864DB20, 0xA527FDF9, 0xA1E6E04E, 0xBFA1B04B, 0xBB60ADFC, 0xB6238B25, 0xB2E29692,
? ? 0x8AAD2B2F, 0x8E6C3698, 0x832F1041, 0x87EE0DF6, 0x99A95DF3, 0x9D684044, 0x902B669D, 0x94EA7B2A,
? ? 0xE0B41DE7, 0xE4750050, 0xE9362689, 0xEDF73B3E, 0xF3B06B3B, 0xF771768C, 0xFA325055, 0xFEF34DE2,
? ? 0xC6BCF05F, 0xC27DEDE8, 0xCF3ECB31, 0xCBFFD686, 0xD5B88683, 0xD1799B34, 0xDC3ABDED, 0xD8FBA05A,
? ? 0x690CE0EE, 0x6DCDFD59, 0x608EDB80, 0x644FC637, 0x7A089632, 0x7EC98B85, 0x738AAD5C, 0x774BB0EB,
? ? 0x4F040D56, 0x4BC510E1, 0x46863638, 0x42472B8F, 0x5C007B8A, 0x58C1663D, 0x558240E4, 0x51435D53,
? ? 0x251D3B9E, 0x21DC2629, 0x2C9F00F0, 0x285E1D47, 0x36194D42, 0x32D850F5, 0x3F9B762C, 0x3B5A6B9B,
? ? 0x0315D626, 0x07D4CB91, 0x0A97ED48, 0x0E56F0FF, 0x1011A0FA, 0x14D0BD4D, 0x19939B94, 0x1D528623,
? ? 0xF12F560E, 0xF5EE4BB9, 0xF8AD6D60, 0xFC6C70D7, 0xE22B20D2, 0xE6EA3D65, 0xEBA91BBC, 0xEF68060B,
? ? 0xD727BBB6, 0xD3E6A601, 0xDEA580D8, 0xDA649D6F, 0xC423CD6A, 0xC0E2D0DD, 0xCDA1F604, 0xC960EBB3,
? ? 0xBD3E8D7E, 0xB9FF90C9, 0xB4BCB610, 0xB07DABA7, 0xAE3AFBA2, 0xAAFBE615, 0xA7B8C0CC, 0xA379DD7B,
? ? 0x9B3660C6, 0x9FF77D71, 0x92B45BA8, 0x9675461F, 0x8832161A, 0x8CF30BAD, 0x81B02D74, 0x857130C3,
? ? 0x5D8A9099, 0x594B8D2E, 0x5408ABF7, 0x50C9B640, 0x4E8EE645, 0x4A4FFBF2, 0x470CDD2B, 0x43CDC09C,
? ? 0x7B827D21, 0x7F436096, 0x7200464F, 0x76C15BF8, 0x68860BFD, 0x6C47164A, 0x61043093, 0x65C52D24,
? ? 0x119B4BE9, 0x155A565E, 0x18197087, 0x1CD86D30, 0x029F3D35, 0x065E2082, 0x0B1D065B, 0x0FDC1BEC,
? ? 0x3793A651, 0x3352BBE6, 0x3E119D3F, 0x3AD08088, 0x2497D08D, 0x2056CD3A, 0x2D15EBE3, 0x29D4F654,
? ? 0xC5A92679, 0xC1683BCE, 0xCC2B1D17, 0xC8EA00A0, 0xD6AD50A5, 0xD26C4D12, 0xDF2F6BCB, 0xDBEE767C,
? ? 0xE3A1CBC1, 0xE760D676, 0xEA23F0AF, 0xEEE2ED18, 0xF0A5BD1D, 0xF464A0AA, 0xF9278673, 0xFDE69BC4,
? ? 0x89B8FD09, 0x8D79E0BE, 0x803AC667, 0x84FBDBD0, 0x9ABC8BD5, 0x9E7D9662, 0x933EB0BB, 0x97FFAD0C,
? ? 0xAFB010B1, 0xAB710D06, 0xA6322BDF, 0xA2F33668, 0xBCB4666D, 0xB8757BDA, 0xB5365D03, 0xB1F740B4
};
// void getcrc_32table()//生成CRC32表
// {
// ? ? unsigned int crc_temp=0x00000000;
// ? ? unsigned int i,j;
// ? ? unsigned int crctemp;
// ? ? for(i=0;i<256;i++)
// ? ? {
// ? ? ? ? crc_temp=i;
// ? ? ? ? for(j=0;j<8;j++)
// ? ? ? ? {
// ? ? ? ? ? ? if(crc_temp&1)
// ? ? ? ? ? ? ? ? crc_temp=(crc_temp>>1)^0xedb88320;//crc32標準，Reflected
// ? ? ? ? ? ? else
// ? ? ? ? ? ? ? ? crc_temp>>=1;
// ? ? ? ? }
// ? ? ? ? CRCTable[i]=crc_temp;
// ? ? }
// }
unsigned int ?cal_crc32(unsigned char *data,unsigned int length)//生成32CRC校驗碼
{
? ? //getcrc_32table();
? ? unsigned int i;
? ? unsigned int crc32=0xffffffff;
? ? for(i=0;i<length;i++)
? ? {
? ? ? ? crc32=(crc32>>8)^CRCTable[(crc32^*(data+i))&0xff];
? ? }
? ? return crc32;
}
bool ?decode_crc32(unsigned char *data, unsigned int length)
{ ?
? ? unsigned check = 0xffffffff;
? ? unsigned int i;
? ? for(i=0;i<length;i++)
? ? {
? ? ? ? check=(check >> 8)^CRCTable[(check^*(data+i))&0xFF];
? ? }
? ? return (check ? false : true); ?
}
void file_operate()
{
? ? unsigned int length;
? ? unsigned int result;
? ? unsigned char crc32_temp[8];
? ? FILE *fp=fopen(PATH,"ab+");
? ? int ret;
? ? if(fp==NULL)
? ? {
? ? ? ? printf("file can not open!\n\r");
? ? ? ? fclose(fp);
? ? ? ? return;
? ? }
? ? //fputs("\n",fp);
? ? //fprintf(fp,"%s",KEY);//添加密鑰
? ?
? ? fseek(fp,0,SEEK_END);
? ? length=ftell(fp);
? ? fseek(fp,0,SEEK_SET);
? ?
? ? printf("%d\n",length);
? ?
? ? unsigned int key_len=sizeof(KEY);
? ? char *data=(char *)malloc(length+key_len+4);
? ? fread(data,length,1,fp);
? ? fseek(fp,0,SEEK_SET);
? ? memcpy(data+length,&KEY,key_len);
? ? result=cal_crc32((unsigned char *)data,length+key_len);//計算文件校驗碼
? ? printf("crc32:0x%x\n",result);
? ?
? ? memcpy(data+length+key_len, (char *)&result, sizeof(result));
? ? sprintf((char *)crc32_buf,"%x",result);
? ? printf("crcbuf:%s\n",crc32_buf);
? ? //memcpy(data+length+4,&crc32_temp, sizeof(result));
? ? //fputs("\n",fp);
? ? printf("%s\n",&data);
? ? int test=decode_crc32((unsigned char *)data,length+key_len+4);
? ? if(test)
? ? ? ? printf("file is ok!\n");
? ? else
? ? ? ? printf("error crc!\n");
? ? fputs("\n",fp); ? ?
? ? ret=fprintf(fp,"%s",crc32_buf);//寫入文件末尾
? ?
? ? fclose(fp);
}
void file_check()
{
? ? int test;
? ? int length;
? ? FILE *fp=fopen(PATH,"ab+");
? ? if(fp==NULL)
? ? {
? ? ? ? printf("file can not open!\n\r");
? ? ? ? fclose(fp);
? ? ? ? return;
? ? }
? ? fseek(fp,0,SEEK_END);
? ? length=ftell(fp);
? ? fseek(fp,0,SEEK_SET);
? ? printf("%d\n",length);
? ?
? ? char *data=(char *)malloc(length);
? ? fread(data,length,1,fp);
? ? fseek(fp,-4,SEEK_END);
? ? fputs("\n",fp);
? ? fprintf(fp,"%s",crc32_buf);
? ? test=decode_crc32((unsigned char *)data,length);
? ? if(test)
? ? ? ? printf("file is ok!\n");
? ? else
? ? ? ? printf("error crc!\n");
? ? ? ? fclose(fp);
}
int main()
{
? ? file_operate();
? ? //file_check();
? ? // unsigned char a[16] = {0x56,0x56,0x03,0x33, 0x56,0x06,0x03,0x33, 0x56,0x06,0x03,0x33, 0x00,0x44,0x44,0x33};
? ? // unsigned char *str = (unsigned char*)malloc(16);
? ? // memcpy(str, a, 16);
? ? // unsigned int ret = cal_crc32(str, 12);
? ? // memcpy(str+12, (char *)&ret, 4);
? ? // printf("the answer %d\n", decode_crc32(str,16));
? ? return 0;
}
添加了文件密鑰作為文件內(nèi)容（但沒有寫入文件），一起計算CRC碼，
