diff options
Diffstat (limited to 'vendor/github.com/cespare/xxhash/v2/xxhash.go')
| -rw-r--r-- | vendor/github.com/cespare/xxhash/v2/xxhash.go | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/vendor/github.com/cespare/xxhash/v2/xxhash.go b/vendor/github.com/cespare/xxhash/v2/xxhash.go index a9e0d45c9..78bddf1ce 100644 --- a/vendor/github.com/cespare/xxhash/v2/xxhash.go +++ b/vendor/github.com/cespare/xxhash/v2/xxhash.go @@ -19,10 +19,13 @@ const ( // Store the primes in an array as well. // // The consts are used when possible in Go code to avoid MOVs but we need a -// contiguous array of the assembly code. +// contiguous array for the assembly code. var primes = [...]uint64{prime1, prime2, prime3, prime4, prime5} // Digest implements hash.Hash64. +// +// Note that a zero-valued Digest is not ready to receive writes. +// Call Reset or create a Digest using New before calling other methods. type Digest struct { v1 uint64 v2 uint64 @@ -33,19 +36,31 @@ type Digest struct { n int // how much of mem is used } -// New creates a new Digest that computes the 64-bit xxHash algorithm. +// New creates a new Digest with a zero seed. func New() *Digest { + return NewWithSeed(0) +} + +// NewWithSeed creates a new Digest with the given seed. +func NewWithSeed(seed uint64) *Digest { var d Digest - d.Reset() + d.ResetWithSeed(seed) return &d } // Reset clears the Digest's state so that it can be reused. +// It uses a seed value of zero. func (d *Digest) Reset() { - d.v1 = primes[0] + prime2 - d.v2 = prime2 - d.v3 = 0 - d.v4 = -primes[0] + d.ResetWithSeed(0) +} + +// ResetWithSeed clears the Digest's state so that it can be reused. +// It uses the given seed to initialize the state. +func (d *Digest) ResetWithSeed(seed uint64) { + d.v1 = seed + prime1 + prime2 + d.v2 = seed + prime2 + d.v3 = seed + d.v4 = seed - prime1 d.total = 0 d.n = 0 } |