C語言實現位元組流與十六進位制字串的相互轉換
阿新 • • 發佈：2019-01-05
//位元組流轉換為十六進位制字串
void ByteToHexStr(const unsigned char* source, char* dest, int sourceLen)
{short i;
unsigned char highByte, lowByte;
for (i = 0; i < sourceLen; i++)
{
highByte = source[i] >> 4;
lowByte = source[i] & 0x0f ;
highByte += 0x30;
if (highByte > 0x39)
dest[i * 2] = highByte + 0x07;
else
dest[i * 2] = highByte;
lowByte += 0x30;
if (lowByte > 0x39)
dest[i * 2 + 1] = lowByte + 0x07;
else
dest[i * 2 + 1] = lowByte;
}
return ;
}
//位元組流轉換為十六進位制字串的另一種實現方式
void Hex2Str( const char *sSrc, char *sDest, int nSrcLen )
{
int i;
char szTmp[3];
for( i = 0; i < nSrcLen; i++ )
{
sprintf( szTmp, "%02X", (unsigned char) sSrc[i] );
memcpy( &sDest[i * 2], szTmp, 2 );
}
return ;
}
void HexStrToByte(const char* source, unsigned char* dest, int sourceLen)
{
short i;
unsigned char highByte, lowByte;
for (i = 0; i < sourceLen; i += 2)
{
highByte = toupper(source[i]);
lowByte = toupper(source[i + 1]);
if (highByte > 0x39)
highByte -= 0x37;
else
highByte -= 0x30;
if (lowByte > 0x39)
lowByte -= 0x37;
else
lowByte -= 0x30;
dest[i / 2] = (highByte << 4) | lowByte;
}
return ;
}