1 files changed, 101 insertions, 0 deletions

diff --git a/vendor/github.com/minio/minio-go/v7/hook-reader.go b/vendor/github.com/minio/minio-go/v7/hook-reader.go
new file mode 100644
index 0000000..07bc7db
--- /dev/null
+++ b/vendor/github.com/minio/minio-go/v7/hook-reader.go
@@ -0,0 +1,101 @@
+/*
+ * MinIO Go Library for Amazon S3 Compatible Cloud Storage
+ * Copyright 2015-2017 MinIO, 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 minio
+
+import (
+        "fmt"
+        "io"
+        "sync"
+)
+
+// hookReader hooks additional reader in the source stream. It is
+// useful for making progress bars. Second reader is appropriately
+// notified about the exact number of bytes read from the primary
+// source on each Read operation.
+type hookReader struct {
+        mu     sync.RWMutex
+        source io.Reader
+        hook   io.Reader
+}
+
+// Seek implements io.Seeker. Seeks source first, and if necessary
+// seeks hook if Seek method is appropriately found.
+func (hr *hookReader) Seek(offset int64, whence int) (n int64, err error) {
+        hr.mu.Lock()
+        defer hr.mu.Unlock()
+
+        // Verify for source has embedded Seeker, use it.
+        sourceSeeker, ok := hr.source.(io.Seeker)
+        if ok {
+                n, err = sourceSeeker.Seek(offset, whence)
+                if err != nil {
+                        return 0, err
+                }
+        }
+
+        if hr.hook != nil {
+                // Verify if hook has embedded Seeker, use it.
+                hookSeeker, ok := hr.hook.(io.Seeker)
+                if ok {
+                        var m int64
+                        m, err = hookSeeker.Seek(offset, whence)
+                        if err != nil {
+                                return 0, err
+                        }
+                        if n != m {
+                                return 0, fmt.Errorf("hook seeker seeked %d bytes, expected source %d bytes", m, n)
+                        }
+                }
+        }
+
+        return n, nil
+}
+
+// Read implements io.Reader. Always reads from the source, the return
+// value 'n' number of bytes are reported through the hook. Returns
+// error for all non io.EOF conditions.
+func (hr *hookReader) Read(b []byte) (n int, err error) {
+        hr.mu.RLock()
+        defer hr.mu.RUnlock()
+
+        n, err = hr.source.Read(b)
+        if err != nil && err != io.EOF {
+                return n, err
+        }
+        if hr.hook != nil {
+                // Progress the hook with the total read bytes from the source.
+                if _, herr := hr.hook.Read(b[:n]); herr != nil {
+                        if herr != io.EOF {
+                                return n, herr
+                        }
+                }
+        }
+        return n, err
+}
+
+// newHook returns a io.ReadSeeker which implements hookReader that
+// reports the data read from the source to the hook.
+func newHook(source, hook io.Reader) io.Reader {
+        if hook == nil {
+                return &hookReader{source: source}
+        }
+        return &hookReader{
+                source: source,
+                hook:   hook,
+        }
+}