1 files changed, 39 insertions, 0 deletions

diff --git a/vendor/github.com/ulikunitz/xz/lzma/breader.go b/vendor/github.com/ulikunitz/xz/lzma/breader.go
new file mode 100644
index 0000000..5350d81
--- /dev/null
+++ b/vendor/github.com/ulikunitz/xz/lzma/breader.go
@@ -0,0 +1,39 @@
+// Copyright 2014-2017 Ulrich Kunitz. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package lzma
+
+import (
+        "errors"
+        "io"
+)
+
+// breader provides the ReadByte function for a Reader. It doesn't read
+// more data from the reader than absolutely necessary.
+type breader struct {
+        io.Reader
+        // helper slice to save allocations
+        p []byte
+}
+
+// ByteReader converts an io.Reader into an io.ByteReader.
+func ByteReader(r io.Reader) io.ByteReader {
+        br, ok := r.(io.ByteReader)
+        if !ok {
+                return &breader{r, make([]byte, 1)}
+        }
+        return br
+}
+
+// ReadByte read byte function.
+func (r *breader) ReadByte() (c byte, err error) {
+        n, err := r.Reader.Read(r.p)
+        if n < 1 {
+                if err == nil {
+                        err = errors.New("breader.ReadByte: no data")
+                }
+                return 0, err
+        }
+        return r.p[0], nil
+}