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Diffstat (limited to 'vendor/golang.org/x/text/internal/catmsg/varint.go')
-rw-r--r--vendor/golang.org/x/text/internal/catmsg/varint.go62
1 files changed, 62 insertions, 0 deletions
diff --git a/vendor/golang.org/x/text/internal/catmsg/varint.go b/vendor/golang.org/x/text/internal/catmsg/varint.go
new file mode 100644
index 0000000..a2cee2c
--- /dev/null
+++ b/vendor/golang.org/x/text/internal/catmsg/varint.go
@@ -0,0 +1,62 @@
+// Copyright 2017 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 catmsg
+
+// This file implements varint encoding analogous to the one in encoding/binary.
+// We need a string version of this function, so we add that here and then add
+// the rest for consistency.
+
+import "errors"
+
+var (
+ errIllegalVarint = errors.New("catmsg: illegal varint")
+ errVarintTooLarge = errors.New("catmsg: varint too large for uint64")
+)
+
+const maxVarintBytes = 10 // maximum length of a varint
+
+// encodeUint encodes x as a variable-sized integer into buf and returns the
+// number of bytes written. buf must be at least maxVarintBytes long
+func encodeUint(buf []byte, x uint64) (n int) {
+ for ; x > 127; n++ {
+ buf[n] = 0x80 | uint8(x&0x7F)
+ x >>= 7
+ }
+ buf[n] = uint8(x)
+ n++
+ return n
+}
+
+func decodeUintString(s string) (x uint64, size int, err error) {
+ i := 0
+ for shift := uint(0); shift < 64; shift += 7 {
+ if i >= len(s) {
+ return 0, i, errIllegalVarint
+ }
+ b := uint64(s[i])
+ i++
+ x |= (b & 0x7F) << shift
+ if b&0x80 == 0 {
+ return x, i, nil
+ }
+ }
+ return 0, i, errVarintTooLarge
+}
+
+func decodeUint(b []byte) (x uint64, size int, err error) {
+ i := 0
+ for shift := uint(0); shift < 64; shift += 7 {
+ if i >= len(b) {
+ return 0, i, errIllegalVarint
+ }
+ c := uint64(b[i])
+ i++
+ x |= (c & 0x7F) << shift
+ if c&0x80 == 0 {
+ return x, i, nil
+ }
+ }
+ return 0, i, errVarintTooLarge
+}