63 lines
1.1 KiB
Go
63 lines
1.1 KiB
Go
package rings
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import (
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"net/netip"
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"darvaza.org/core"
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)
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// DecodeAddress ... TODO
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//
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// revive:disable:function-result-limit
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func DecodeAddress(addr netip.Addr) (Ring, RegionID, ZoneID, uint) {
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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(a4[0], a4[1], a4[2], a4[3])
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}
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}
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return InvalidRing, 0, 0, 0
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}
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// revive:disable:function-result-limit
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func unsafeDecodeAddress(a, b, c, d byte) (Ring, RegionID, ZoneID, uint) {
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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 InvalidRing, 0, 0, 0
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case b&0xf0 != 0:
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k := RingThree
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r := RegionID(b >> 4)
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n2 := uint(b & 0x0f)
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n1 := uint(c)
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n0 := uint(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 b&0x0f != 0:
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r := RegionID(b)
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z := ZoneID(c >> 4)
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k := core.IIf(z == 0, RingTwo, RingOne)
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n1 := uint(c & 0x0f)
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n0 := uint(d)
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n := n0 + n1<<8
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return k, r, z, n
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default: // b == 0
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k := RingZero
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r := RegionID(c >> 4)
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z := ZoneID(c & 0xf)
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n := uint(d)
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return k, r, z, n
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}
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}
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