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75 lines
1.3 KiB
75 lines
1.3 KiB
5 months ago
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package rings
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import (
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"net/netip"
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)
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// DecodeAddress extracts ring address fields from a given 10.0.0.0/8
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// address.
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//
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// revive:disable:function-result-limit
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func DecodeAddress[T ~uint | NodeID](addr netip.Addr) (RingID, RegionID, ZoneID, T) {
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// revive:enable:function-result-limit
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if addr.IsValid() {
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if addr.Is4In6() {
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addr = addr.Unmap()
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}
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if addr.Is4() {
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a4 := addr.As4()
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return unsafeDecodeAddress[T](a4[0], a4[1], a4[2], a4[3])
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}
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}
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return UnspecifiedRingID, 0, 0, 0
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}
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// revive:disable:function-result-limit
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func unsafeDecodeAddress[T ~uint | NodeID](a, b, c, d byte) (RingID, RegionID, ZoneID, T) {
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// revive:enable:function-result-limit
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switch {
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case a != 10:
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return UnspecifiedRingID, 0, 0, 0
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case b == 0x00:
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// 10.00.RZ.dd
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k := RingZeroID
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r := RegionID(c >> 4)
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z := ZoneID(c & 0xf)
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n := T(d)
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return k, r, z, n
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case b&0xf0 != 0:
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// 10.Rb.cc.dd
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k := RingThreeID
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r := RegionID(b >> 4)
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n2 := T(b & 0x0f)
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n1 := T(c)
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n0 := T(d)
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n := n0 + n1<<8 + n2<<16
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return k, r, 0, n
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case c&0xf0 != 0:
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// 10.0R.Zc.dd
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k := RingOneID
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r := RegionID(b)
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z := ZoneID(c >> 4)
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n1 := T(c & 0x0f)
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n0 := T(d)
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n := n0 + n1<<8
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return k, r, z, n
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default:
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// 10.0R.0c.dd
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k := RingTwoID
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r := RegionID(b)
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n1 := T(c & 0x0f)
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n0 := T(d)
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n := n0 + n1<<8
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return k, r, 0, n
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}
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}
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