C的一小段程序转成java

Question

如题：
void CARD::asc_to_bcd(bcd_buf,ascii_buf,conv_len,type)
unsigned char *bcd_buf,*ascii_buf,type;
int      conv_len;
{
int  cnt;
char ch,ch1; if( conv_len&0x01 && type )
ch1 = 0;
else
ch1 = 0x55; for(cnt=0; cnt<conv_len; ascii_buf++,cnt++) 
    {
if(*ascii_buf>='a')
   ch=*ascii_buf-'a'+10;
else if(*ascii_buf>='A')
   ch=*ascii_buf-'A'+10;
else if(*ascii_buf>='0')
   ch=*ascii_buf-'0';
else
   ch=0; if(ch1==0x55)
   ch1=ch;
else 
        {
     *bcd_buf++ = (ch1<<4)|ch;
ch1=0x55;
}
} if(ch1!=0x55)
       *bcd_buf=ch1<<4; return;
}
转成java的代码