[VOL-4290] Voltha go library updates for gRPC migration
Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/github.com/cespare/xxhash/v2/xxhash_unsafe.go b/vendor/github.com/cespare/xxhash/v2/xxhash_unsafe.go
new file mode 100644
index 0000000..53bf76e
--- /dev/null
+++ b/vendor/github.com/cespare/xxhash/v2/xxhash_unsafe.go
@@ -0,0 +1,46 @@
+// +build !appengine
+
+// This file encapsulates usage of unsafe.
+// xxhash_safe.go contains the safe implementations.
+
+package xxhash
+
+import (
+ "reflect"
+ "unsafe"
+)
+
+// Notes:
+//
+// See https://groups.google.com/d/msg/golang-nuts/dcjzJy-bSpw/tcZYBzQqAQAJ
+// for some discussion about these unsafe conversions.
+//
+// In the future it's possible that compiler optimizations will make these
+// unsafe operations unnecessary: https://golang.org/issue/2205.
+//
+// Both of these wrapper functions still incur function call overhead since they
+// will not be inlined. We could write Go/asm copies of Sum64 and Digest.Write
+// for strings to squeeze out a bit more speed. Mid-stack inlining should
+// eventually fix this.
+
+// Sum64String computes the 64-bit xxHash digest of s.
+// It may be faster than Sum64([]byte(s)) by avoiding a copy.
+func Sum64String(s string) uint64 {
+ var b []byte
+ bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
+ bh.Data = (*reflect.StringHeader)(unsafe.Pointer(&s)).Data
+ bh.Len = len(s)
+ bh.Cap = len(s)
+ return Sum64(b)
+}
+
+// WriteString adds more data to d. It always returns len(s), nil.
+// It may be faster than Write([]byte(s)) by avoiding a copy.
+func (d *Digest) WriteString(s string) (n int, err error) {
+ var b []byte
+ bh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
+ bh.Data = (*reflect.StringHeader)(unsafe.Pointer(&s)).Data
+ bh.Len = len(s)
+ bh.Cap = len(s)
+ return d.Write(b)
+}