1 files changed, 94 insertions, 0 deletions
diff --git a/vendor/github.com/blevesearch/zapx/v12/memuvarint.go b/vendor/github.com/blevesearch/zapx/v12/memuvarint.go
new file mode 100644
index 0000000000..0c10c83a4e
--- /dev/null
+++ b/vendor/github.com/blevesearch/zapx/v12/memuvarint.go
@@ -0,0 +1,94 @@
+//  Copyright (c) 2020 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package zap
+
+import (
+	"fmt"
+)
+
+type memUvarintReader struct {
+	C int // index of next byte to read from S
+	S []byte
+}
+
+func newMemUvarintReader(s []byte) *memUvarintReader {
+	return &memUvarintReader{S: s}
+}
+
+// Len returns the number of unread bytes.
+func (r *memUvarintReader) Len() int {
+	n := len(r.S) - r.C
+	if n < 0 {
+		return 0
+	}
+	return n
+}
+
+// ReadUvarint reads an encoded uint64.  The original code this was
+// based on is at encoding/binary/ReadUvarint().
+func (r *memUvarintReader) ReadUvarint() (uint64, error) {
+	var x uint64
+	var s uint
+	var C = r.C
+	var S = r.S
+
+	for {
+		b := S[C]
+		C++
+
+		if b < 0x80 {
+			r.C = C
+
+			// why 63?  The original code had an 'i += 1' loop var and
+			// checked for i > 9 || i == 9 ...; but, we no longer
+			// check for the i var, but instead check here for s,
+			// which is incremented by 7.  So, 7*9 == 63.
+			//
+			// why the "extra" >= check?  The normal case is that s <
+			// 63, so we check this single >= guard first so that we
+			// hit the normal, nil-error return pathway sooner.
+			if s >= 63 && (s > 63 || s == 63 && b > 1) {
+				return 0, fmt.Errorf("memUvarintReader overflow")
+			}
+
+			return x | uint64(b)<<s, nil
+		}
+
+		x |= uint64(b&0x7f) << s
+		s += 7
+	}
+}
+
+// SkipUvarint skips ahead one encoded uint64.
+func (r *memUvarintReader) SkipUvarint() {
+	for {
+		b := r.S[r.C]
+		r.C++
+
+		if b < 0x80 {
+			return
+		}
+	}
+}
+
+// SkipBytes skips a count number of bytes.
+func (r *memUvarintReader) SkipBytes(count int) {
+	r.C = r.C + count
+}
+
+func (r *memUvarintReader) Reset(s []byte) {
+	r.C = 0
+	r.S = s
+}