Revert 138791 - Revert 138554 - Prevent zero-length items from being appended to a blob.

BUG=128266
TEST=as in the bug


Review URL: https://chromiumcodereview.appspot.com/10386183

TBR=ericu@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10444010

TBR=danakj@chromium.org
Review URL: https://chromiumcodereview.appspot.com/10442013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@138802 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 32 insertions, 1 deletions

diff --git a/webkit/blob/blob_data.cc b/webkit/blob/blob_data.cc
index 57d9bc2..33ee36b 100644
--- a/webkit/blob/blob_data.cc
+++ b/webkit/blob/blob_data.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -86,4 +86,35 @@ BlobData::BlobData(const WebBlobData& data) {
 
 BlobData::~BlobData() {}
 
+void BlobData::AppendData(const char* data, size_t length) {
+  DCHECK(length > 0);
+  items_.push_back(Item());
+  items_.back().SetToData(data, length);
+}
+
+void BlobData::AppendFile(const FilePath& file_path, uint64 offset,
+                          uint64 length,
+                          const base::Time& expected_modification_time) {
+  DCHECK(length > 0);
+  items_.push_back(Item());
+  items_.back().SetToFile(file_path, offset, length,
+                          expected_modification_time);
+}
+
+void BlobData::AppendBlob(const GURL& blob_url, uint64 offset, uint64 length) {
+  DCHECK(length > 0);
+  items_.push_back(Item());
+  items_.back().SetToBlob(blob_url, offset, length);
+}
+
+int64 BlobData::GetMemoryUsage() const {
+  int64 memory = 0;
+  for (std::vector<Item>::const_iterator iter = items_.begin();
+       iter != items_.end(); ++iter) {
+    if (iter->type == TYPE_DATA)
+      memory += iter->data.size();
+  }
+  return memory;
+}
+
 }  // namespace webkit_blob