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zeekay
765c3d0aa1
Module path, package names, and identifiers de-branded to native/proto/compress/ pool/tracing. Server wire-protocol strings preserved. Vendored codec surface used by hanzo-ds/go (proto + compress).
69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
package proto
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import (
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"encoding/binary"
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"math"
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)
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// Int256 is 256-bit signed integer.
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type Int256 struct {
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Low UInt128 // first 128 bits
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High UInt128 // last 128 bits
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}
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// Int256FromInt creates new Int256 from int.
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func Int256FromInt(v int) Int256 {
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var hi UInt128
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lo := UInt128{Low: uint64(v)}
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if v < 0 {
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hi = UInt128{
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Low: math.MaxUint64,
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High: math.MaxUint64,
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}
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lo.High = math.MaxUint64
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}
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return Int256{
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High: hi,
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Low: lo,
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}
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}
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// UInt256 is 256-bit unsigned integer.
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type UInt256 struct {
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Low UInt128 // first 128 bits
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High UInt128 // last 128 bits
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}
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// UInt256FromInt creates new UInt256 from int.
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func UInt256FromInt(v int) UInt256 {
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return UInt256(Int256FromInt(v))
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}
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// UInt256FromUInt64 creates new UInt256 from uint64.
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func UInt256FromUInt64(v uint64) UInt256 {
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return UInt256{Low: UInt128{Low: v}}
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}
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func binUInt256(b []byte) UInt256 {
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_ = b[:256/8] // bounds check hint to compiler; see golang.org/issue/14808
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// Calling manually because binUInt128 is not inlining.
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return UInt256{
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Low: UInt128{
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Low: binary.LittleEndian.Uint64(b[0 : 64/8]),
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High: binary.LittleEndian.Uint64(b[64/8 : 128/8]),
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},
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High: UInt128{
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Low: binary.LittleEndian.Uint64(b[128/8 : 192/8]),
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High: binary.LittleEndian.Uint64(b[192/8 : 256/8]),
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},
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}
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}
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func binPutUInt256(b []byte, v UInt256) {
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// Calling manually because binPutUInt128 is not inlining.
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binary.LittleEndian.PutUint64(b[192/8:256/8], v.High.High)
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binary.LittleEndian.PutUint64(b[128/8:192/8], v.High.Low)
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binary.LittleEndian.PutUint64(b[64/8:128/8], v.Low.High)
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binary.LittleEndian.PutUint64(b[0:64/8], v.Low.Low)
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}
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