diff --git a/build.pl b/build.pl
index 8bfef0b67..bb1fa205a 100755
--- a/build.pl
+++ b/build.pl
@@ -417,6 +417,7 @@ TARGET: lib/go/camli/jsonconfig
 TARGET: lib/go/camli/jsonsign
 TARGET: lib/go/camli/lru
 TARGET: lib/go/camli/magic
+TARGET: lib/go/camli/misc
 TARGET: lib/go/camli/misc/amazon/s3
 TARGET: lib/go/camli/misc/httprange
 TARGET: lib/go/camli/mysqlindexer
diff --git a/lib/go/camli/client/upload.go b/lib/go/camli/client/upload.go
index 04e643e15..caaf59e29 100644
--- a/lib/go/camli/client/upload.go
+++ b/lib/go/camli/client/upload.go
@@ -18,7 +18,6 @@ package client
 
 import (
 	"bytes"
-	"camli/blobref"
 	"crypto/sha1"
 	"encoding/base64"
 	"fmt"
@@ -29,6 +28,9 @@ import (
 	"log"
 	"os"
 	"strings"
+
+	"camli/blobref"
+	"camli/misc"
 )
 
 var _ = log.Printf
@@ -293,7 +295,7 @@ func (c *Client) Upload(h *UploadHandle) (*PutResult, os.Error) {
 	contentsSize := int64(0)
 	req.Body = ioutil.NopCloser(io.MultiReader(
 		strings.NewReader(multiPartHeader),
-		countingReader{h.Contents, &contentsSize},
+		misc.CountingReader{h.Contents, &contentsSize},
 		strings.NewReader(multiPartFooter)))
 
 	if h.Size >= 0 {
@@ -380,13 +382,3 @@ func (c *Client) Upload(h *UploadHandle) (*PutResult, os.Error) {
 	return nil, os.NewError("Server didn't receive blob.")
 }
 
-type countingReader struct {
-	r io.Reader
-	n *int64
-}
-
-func (cr countingReader) Read(p []byte) (n int, err os.Error) {
-	n, err = cr.r.Read(p)
-	*cr.n += int64(n)
-	return
-}
diff --git a/lib/go/camli/misc/countingreader.go b/lib/go/camli/misc/countingreader.go
new file mode 100644
index 000000000..6037f6a8f
--- /dev/null
+++ b/lib/go/camli/misc/countingreader.go
@@ -0,0 +1,35 @@
+/*
+Copyright 2011 Google 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 misc
+
+import (
+	"io"
+	"os"
+)
+
+// CountingReader wraps a Reader, incrementing N by the number of
+// bytes read. No locking is performed.
+type CountingReader struct {
+	Reader io.Reader
+	N      *int64
+}
+
+func (cr CountingReader) Read(p []byte) (n int, err os.Error) {
+	n, err = cr.Reader.Read(p)
+	*cr.N += int64(n)
+	return
+}