UTF8 to UTF16

為咗記得自己寫個D乜~~
打番 SIN
呢一個係個C版的utf8 to utf16 function
超級簡單
因為我在網上完全找唔到~~所以自己寫了一個

int utf8toutf16(char * input){
unsigned char data[16];
*data = input;
int size = sizeof(data);
int i = 0;
unsigned int value;
printf("%x , %d \n",data,size);

if((data[0] & 0xF8) == 0xF0){
//case 1 :4 bytes
value=((((((((unsigned int)data[0]&0x7)<<3)|((unsigned int)data[1]&0x3F))<<6)|((unsigned int)data[2])&0x3f))<<6)|((unsigned int)data[3]&0x3f);
}else if((data[0] & 0xF0) == 0xE0){
//case 2 :3 bytes
value=(((((unsigned int)data[0]&0xF)<<4)|((unsigned int)data[1]&0x3f))<<6)|((unsigned int)data[2]&0x3f);
}else if((data[0] & 0xE0) == 0xC0){
//case 3 :2 bytes
value=(((unsigned int)data[0]&0x1F)<<5)|((unsigned int)data[1]&0x3f);
}else{
//case 4 :1 bytes
value=(unsigned int)data[0];
}
printf("%x , %d\n",value,sizeof(value));
return value;
}