LogDog: Fix archival Get/Tail implementations.

common/iotools/countingreader.go

Index: common/iotools/countingreader.go
diff --git a/common/iotools/countingreader.go b/common/iotools/countingreader.go
index ec807e45403a6304be2793fc27c0d7f3e6c70787..8c0f1b1396516eb48fb2a4a7e2e560d03f48bfbe 100644
--- a/common/iotools/countingreader.go
+++ b/common/iotools/countingreader.go
@@ -12,7 +12,7 @@ import (
 type CountingReader struct {
 	io.Reader // The underlying io.Reader.
 
-	count int64
+	Count int64

[dnj, 2016/10/19 23:18:59]

This is trivial enough that I don't mind combining it. No reason not to offer
direct access to this, and I use it below to clear the count periodically.

 }
 
 var _ io.Reader = (*CountingReader)(nil)
@@ -20,7 +20,7 @@ var _ io.Reader = (*CountingReader)(nil)
 // Read implements io.Reader.
 func (c *CountingReader) Read(buf []byte) (int, error) {
 	amount, err := c.Reader.Read(buf)
-	c.count += int64(amount)
+	c.Count += int64(amount)
 	return amount, err
 }
 
@@ -30,7 +30,7 @@ func (c *CountingReader) ReadByte() (byte, error) {
 	if br, ok := c.Reader.(io.ByteReader); ok {
 		b, err := br.ReadByte()
 		if err == nil {
-			c.count++
+			c.Count++
 		}
 		return b, err
 	}
@@ -38,13 +38,8 @@ func (c *CountingReader) ReadByte() (byte, error) {
 	data := []byte{0}
 	amount, err := c.Reader.Read(data)
 	if amount != 0 {
-		c.count += int64(amount)
+		c.Count += int64(amount)
 		return data[0], err
 	}
 	return 0, err
 }
-
-// Count returns the number of bytes that have been read.
-func (c *CountingReader) Count() int64 {
-	return c.count
-}