added get-blob-stream helper and corresponding test

blobstore/src/main/clojure/org/jclouds/blobstore.clj

@@ -237,6 +237,13 @@ Options can also be specified for extension modules
   ([container-name path #^BlobStore blobstore]
      (.getBlob blobstore container-name path)))
 
+(defn get-blob-stream
+  "Get an inputstream from the blob at a given path"
+  ([container-name path]
+     (get-blob-stream container-name path *blobstore*))
+  ([container-name path #^BlobStore blobstore]
+     (.getInput(.getPayload(.getBlob blobstore container-name path)))))
+
 (defn remove-blob
   "Remove blob from given path"
   ([container-name path]
@@ -311,7 +318,7 @@ container, name, string -> etag"
                                        & [retries]]
   (let [blob (get-blob container-name name blobstore)
         digest-stream (DigestOutputStream.
-                       target (MessageDigest/getInstance "MD5"))]
+                       target (.md5(.crypto (.utils (blobstore-context blobstore)))))]
     (.writeTo (.getPayload blob) digest-stream)
     (let [digest (.digest (.getMessageDigest digest-stream))
           metadata-digest (.getContentMD5 (.getPayload blob))]

blobstore/src/test/clojure/org/jclouds/blobstore_test.clj

@@ -20,7 +20,8 @@
   (:use [org.jclouds.blobstore] :reload-all)
   (:use [clojure.test])
   (:import [org.jclouds.blobstore BlobStoreContextFactory]
-           [java.io ByteArrayOutputStream]))
+           [java.io ByteArrayOutputStream]
+           [org.jclouds.util Utils]))
 
 (defn clean-stub-fixture
   "This should allow basic tests to easily be run with another service."
@@ -73,6 +74,12 @@
   (is (= 3 (count (list-container "container" :with-details true))))
   (is (= 1 (count (list-container "container" :in-directory "dir")))))
 
+(deftest get-blob-test
+  (is (create-container "blob"))
+  (is (upload-blob "blob" "blob1" "blob1"))
+  (is (upload-blob "blob" "blob2" "blob2"))
+  (is (= "blob2" (Utils/toStringAndClose (get-blob-stream "blob" "blob2")))))
+
 (deftest download-blob-test
   (let [name "test"
         container-name "test-container"