🚀 go-pugleaf

Buenas !!

ALguien me puede decir como se convierte este codigo
de C a Java ?

Un saludo 

javier@sinix.net

#define FCSINIT 0xFFFF
#define FCSGOOD 0xF0B8
#define FCSSIZE 2       /* 16 bit FCS */
#define BUFSIZE 18      /* No particular reason this has to be 18--it's
			 * just that way for test */

/* 16 bit FCS lookup table per RFC1331 */

unsigned short fcstab[256] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, 
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, 
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, 
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, 
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, 
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};

/* Arbitrary-sized input buffer (arbitrary data). Last two
characters of the array are used for FCS and are not initialized to any
specific value */

unsigned char inbuf[BUFSIZE] = {0xff, 0x03, 0xc0, 0x21, 0x01, 0xc9,
0x00, 0x0c,
			       0x01, 0x04, 0x05, 0xdc, 0x08, 0x02, 0x07,
			       0x02};


main()
{
    int i;
    unsigned short fcsval = FCSINIT;

    printf("\n");
    
    for(i=0; i< BUFSIZE - FCSSIZE; i++)
	fcsval = (fcsval >>8) ^ fcstab[(fcsval ^ inbuf[i]) & 0xff];
    printf("FCS value %x\n", fcsval);
    fcsval = ~fcsval;
    inbuf[i++] = fcsval & 0xff;         /* Least significant byte of FCS
*/
    inbuf[i] = (fcsval >> 8) & 0xff;    /* MSB of FCS */

    printf("'Transmitted' packet:");
    for(i=0; i<BUFSIZE; i++)
	printf("%x ", inbuf[i]);
    printf("\n");

    printf("---Meanwhile, on the other 'side' of the link---\n\n");

    fcsval = FCSINIT;

    for(i=0; i<BUFSIZE; i++)
	fcsval = (fcsval >>8) ^ fcstab[(fcsval ^ inbuf[i]) & 0xff];

    printf("'Received' FCS result %x. ");

    if(fcsval == FCSGOOD)
	printf("FCS Good\n");
    else
	printf("FCS Bad\n");
	
    printf("\n");
}