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#include <u.h>
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#include <libc.h>
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#include <ip.h>
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/*
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 *  well known IP addresses
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 */
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uchar IPv4bcast[IPaddrlen] = {
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	0, 0, 0, 0,
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	0, 0, 0, 0,
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	0, 0, 0xff, 0xff,
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	0xff, 0xff, 0xff, 0xff
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};
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uchar IPv4allsys[IPaddrlen] = {
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	0, 0, 0, 0,
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	0, 0, 0, 0,
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	0, 0, 0xff, 0xff,
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	0xe0, 0, 0, 0x01
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};
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uchar IPv4allrouter[IPaddrlen] = {
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	0, 0, 0, 0,
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	0, 0, 0, 0,
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	0, 0, 0xff, 0xff,
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	0xe0, 0, 0, 0x02
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};
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uchar IPallbits[IPaddrlen] = {
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	0xff, 0xff, 0xff, 0xff,
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	0xff, 0xff, 0xff, 0xff,
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	0xff, 0xff, 0xff, 0xff,
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	0xff, 0xff, 0xff, 0xff
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};
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uchar IPnoaddr[IPaddrlen];
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/*
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 *  prefix of all v4 addresses
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 */
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uchar v4prefix[IPaddrlen] = {
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	0, 0, 0, 0,
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	0, 0, 0, 0,
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	0, 0, 0xff, 0xff,
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	0, 0, 0, 0
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};
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int
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isv4(uchar *ip)
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{
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	return memcmp(ip, v4prefix, IPv4off) == 0;
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}
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/*
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 *  the following routines are unrolled with no memset's to speed
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 *  up the usual case
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 */
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void
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v4tov6(uchar *v6, uchar *v4)
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{
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	v6[0] = 0;
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	v6[1] = 0;
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	v6[2] = 0;
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	v6[3] = 0;
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	v6[4] = 0;
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	v6[5] = 0;
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	v6[6] = 0;
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	v6[7] = 0;
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	v6[8] = 0;
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	v6[9] = 0;
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	v6[10] = 0xff;
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	v6[11] = 0xff;
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	v6[12] = v4[0];
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	v6[13] = v4[1];
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	v6[14] = v4[2];
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	v6[15] = v4[3];
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}
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int
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v6tov4(uchar *v4, uchar *v6)
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{
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	if(v6[0] == 0
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	&& v6[1] == 0
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	&& v6[2] == 0
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	&& v6[3] == 0
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	&& v6[4] == 0
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	&& v6[5] == 0
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	&& v6[6] == 0
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	&& v6[7] == 0
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	&& v6[8] == 0
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	&& v6[9] == 0
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	&& v6[10] == 0xff
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	&& v6[11] == 0xff)
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	{
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		v4[0] = v6[12];
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		v4[1] = v6[13];
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		v4[2] = v6[14];
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		v4[3] = v6[15];
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		return 0;
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	} else {
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		memset(v4, 0, 4);
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		if(memcmp(v6, IPnoaddr, IPaddrlen) == 0)
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			return 0;
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		return -1;
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	}
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}