C语言实现字节流与十六进制字符串的相互转换-蒲公英云

C语言实现字节流与十六进制字符串的相互转换

//字节流转换为十六进制字符串

//（例如：char数组中原先存储的{0x2e}，转换之后变成了char数组中存储的{0x32,0x65}）
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;

}
//十六进制字符串转换为字节流

//（例如：char数组中原先存储的{0x32,0x65}，转换之后变成了char数组中存储的{0x2e}）
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;