diff options
| author | Mistivia <i@mistivia.com> | 2025-11-02 15:27:18 +0800 |
|---|---|---|
| committer | Mistivia <i@mistivia.com> | 2025-11-02 15:27:18 +0800 |
| commit | e9c24f4af7ed56760f6db7941827d09f6db9020b (patch) | |
| tree | 62128c43b883ce5e3148113350978755779bb5de /teleirc/matterbridge/vendor/google.golang.org/protobuf/internal/detrand | |
| parent | 58d5e7cfda4781d8a57ec52aefd02983835c301a (diff) | |
add matterbridge
Diffstat (limited to 'teleirc/matterbridge/vendor/google.golang.org/protobuf/internal/detrand')
| -rw-r--r-- | teleirc/matterbridge/vendor/google.golang.org/protobuf/internal/detrand/rand.go | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/teleirc/matterbridge/vendor/google.golang.org/protobuf/internal/detrand/rand.go b/teleirc/matterbridge/vendor/google.golang.org/protobuf/internal/detrand/rand.go new file mode 100644 index 0000000..49c8676 --- /dev/null +++ b/teleirc/matterbridge/vendor/google.golang.org/protobuf/internal/detrand/rand.go @@ -0,0 +1,69 @@ +// Copyright 2018 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package detrand provides deterministically random functionality. +// +// The pseudo-randomness of these functions is seeded by the program binary +// itself and guarantees that the output does not change within a program, +// while ensuring that the output is unstable across different builds. +package detrand + +import ( + "encoding/binary" + "hash/fnv" + "os" +) + +// Disable disables detrand such that all functions returns the zero value. +// This function is not concurrent-safe and must be called during program init. +func Disable() { + randSeed = 0 +} + +// Bool returns a deterministically random boolean. +func Bool() bool { + return randSeed%2 == 1 +} + +// Intn returns a deterministically random integer between 0 and n-1, inclusive. +func Intn(n int) int { + if n <= 0 { + panic("must be positive") + } + return int(randSeed % uint64(n)) +} + +// randSeed is a best-effort at an approximate hash of the Go binary. +var randSeed = binaryHash() + +func binaryHash() uint64 { + // Open the Go binary. + s, err := os.Executable() + if err != nil { + return 0 + } + f, err := os.Open(s) + if err != nil { + return 0 + } + defer f.Close() + + // Hash the size and several samples of the Go binary. + const numSamples = 8 + var buf [64]byte + h := fnv.New64() + fi, err := f.Stat() + if err != nil { + return 0 + } + binary.LittleEndian.PutUint64(buf[:8], uint64(fi.Size())) + h.Write(buf[:8]) + for i := int64(0); i < numSamples; i++ { + if _, err := f.ReadAt(buf[:], i*fi.Size()/numSamples); err != nil { + return 0 + } + h.Write(buf[:]) + } + return h.Sum64() +} |
