unsigned char AppengCrc32(unsigned char *FileName)

{

unsigned long CRC = 0xFFFFFFFF;

unsigned int  i;

unsigned char Res=0;

unsigned char Buff[513];

unsigned int  RealRead;

FILE          *Fp;

unsigned short FileSize;

Fp=fopen((const char *)FileName,"r+");

fread(&FileSize,1,2,Fp);

FileSize+=4;

fseek(Fp,0,SEEK_SET);

fwrite(&FileSize,2,1,Fp);

fseek(Fp,0,SEEK_SET);

if(Fp!=NULL)

{

for(;;)

{

RealRead=fread(Buff,1,512,Fp);

if(RealRead!=0)

{

for(i = 0;i < RealRead;i++)

CRC = CRC32[((CRC & 0xFF) ^ Buff[i])] ^ (CRC >> 8);

}

else

break;

}

}

CRC = ~CRC;

fseek(Fp,0,SEEK_END);

fwrite(&CRC,4,1,Fp);

fclose(Fp);

return 1;

}

unsigned char WinCheckCrc32(unsigned char *FileName)

{

typedef struct

{

signed int   FileSize;

signed int   AccFp   ;

unsigned long  CrcRead;

}TCrc32File;

unsigned long CRC = 0xFFFFFFFF;

signed int  i;

unsigned char Res=0;

unsigned char Buff[513];

signed int  RealRead;

TCrc32File  Crc32File;

FILE          *Fp;

Crc32File.AccFp=0;

Fp=fopen(FileName,"rb");

fseek(Fp,0,SEEK_END);

Crc32File.FileSize=ftell(Fp);

fseek(Fp,SEEK_SET,0);

if(Fp!=NULL)

{

for(;;)

{

RealRead=fread(Buff,1,512,Fp);

if(RealRead>0)

{

for(i = 0;i

{

Crc32File.AccFp++;

if(Crc32File.AccFp>Crc32File.FileSize-4) break;

CRC = CRC32[((CRC & 0xFF) ^ Buff[i])] ^ (CRC >> 8);

}

}

else

break;

}

}

CRC = ~CRC;

fclose(Fp);

Fp=fopen(FileName,"rb");

fseek(Fp,-4,SEEK_END);

fread(&Crc32File.CrcRead,4,1,Fp);

fclose(Fp);

return (Crc32File.CrcRead==CRC) ;

}