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57 lines
1.1 KiB
Go
57 lines
1.1 KiB
Go
package tools
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import (
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"encoding/binary"
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"github.com/Dreamacro/clash/common/pool"
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)
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// XorShift128Plus - a pseudorandom number generator
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type XorShift128Plus struct {
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s [2]uint64
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}
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func (r *XorShift128Plus) Next() uint64 {
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x := r.s[0]
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y := r.s[1]
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r.s[0] = y
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x ^= x << 23
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x ^= y ^ (x >> 17) ^ (y >> 26)
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r.s[1] = x
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return x + y
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}
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func (r *XorShift128Plus) InitFromBin(bin []byte) {
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var full []byte
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if len(bin) < 16 {
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full := pool.Get(16)[:0]
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defer pool.Put(full)
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full = append(full, bin...)
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for len(full) < 16 {
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full = append(full, 0)
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}
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} else {
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full = bin
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}
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r.s[0] = binary.LittleEndian.Uint64(full[:8])
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r.s[1] = binary.LittleEndian.Uint64(full[8:16])
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}
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func (r *XorShift128Plus) InitFromBinAndLength(bin []byte, length int) {
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var full []byte
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if len(bin) < 16 {
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full := pool.Get(16)[:0]
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defer pool.Put(full)
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full = append(full, bin...)
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for len(full) < 16 {
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full = append(full, 0)
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}
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}
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full = bin
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binary.LittleEndian.PutUint16(full, uint16(length))
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r.s[0] = binary.LittleEndian.Uint64(full[:8])
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r.s[1] = binary.LittleEndian.Uint64(full[8:16])
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for i := 0; i < 4; i++ {
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r.Next()
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}
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}
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