[BlobAsync] Disk support for blob storage

content/browser/blob_storage/blob_slice_unittest.cc

+// Copyright 2016 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.
+
+#include "storage/browser/blob/blob_slice.h"
+
+#include <memory>
+
+#include "storage/browser/blob/blob_data_item.h"
+#include "storage/browser/blob/internal_blob_data.h"
+#include "storage/browser/blob/shareable_blob_data_item.h"
+#include "storage/common/data_element.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace storage {
+namespace {
+
+void ExpectFirstSlice(const BlobSlice& slice,
+                      scoped_refptr<ShareableBlobDataItem> source_item,
+                      size_t first_item_slice_offset,
+                      size_t size) {
+  EXPECT_TRUE(slice.has_sliced_first_memory_item);
+  EXPECT_EQ(first_item_slice_offset, slice.first_item_slice_offset);
+
+  ASSERT_LE(1u, slice.dest_items.size());
+  const DataElement& dest_element = slice.dest_items[0]->item()->data_element();
+
+  EXPECT_EQ(DataElement::TYPE_BYTES_DESCRIPTION, dest_element.type());
+  EXPECT_EQ(static_cast<uint64_t>(size), dest_element.length());
+
+  EXPECT_EQ(*source_item, *slice.first_source_item);
+}
+
+void ExpectLastSlice(const BlobSlice& slice,
+                     scoped_refptr<ShareableBlobDataItem> source_item,
+                     size_t size) {
+  EXPECT_TRUE(slice.has_sliced_last_memory_item);
+
+  ASSERT_LE(2u, slice.dest_items.size());
+  const DataElement& dest_element =
+      slice.dest_items.back()->item()->data_element();
+
+  EXPECT_EQ(DataElement::TYPE_BYTES_DESCRIPTION, dest_element.type());
+  EXPECT_EQ(static_cast<uint64_t>(size), dest_element.length());
+
+  EXPECT_EQ(*source_item, *slice.last_source_item);
+}
+
+scoped_refptr<ShareableBlobDataItem> CreateDataItem(size_t size) {
+  std::unique_ptr<DataElement> element(new DataElement());
+  element->SetToAllocatedBytes(size);
+  for (size_t i = 0; i < size; i++) {
+    *(element->mutable_bytes() + i) = i;
+  }
+  return scoped_refptr<ShareableBlobDataItem>(
+      new ShareableBlobDataItem(new BlobDataItem(std::move(element))));
+};
+
+scoped_refptr<ShareableBlobDataItem> CreateFileItem(size_t offset,
+                                                    size_t size) {
+  std::unique_ptr<DataElement> element(new DataElement());
+  element->SetToFilePathRange(base::FilePath("kFakePath"), offset, size,
+                              base::Time::Max());
+  return scoped_refptr<ShareableBlobDataItem>(
+      new ShareableBlobDataItem(new BlobDataItem(std::move(element))));
+};
+
+TEST(BlobSlice, FullItem) {
+  const std::string kBlobUUID = "kId";
+  const size_t kSize = 5u;
+
+  InternalBlobData data;
+  scoped_refptr<ShareableBlobDataItem> item = CreateDataItem(kSize);
+  data.AppendSharedBlobItem(kBlobUUID, item);
+
+  BlobSlice slice(data, 0, 5);
+  EXPECT_EQ(0u, slice.copying_memory_size);
+  EXPECT_FALSE(slice.has_sliced_first_memory_item);
+  EXPECT_FALSE(slice.has_sliced_last_memory_item);
+  EXPECT_FALSE(slice.first_source_item);
+  EXPECT_FALSE(slice.last_source_item);
+  ASSERT_EQ(1u, slice.dest_items.size());
+  EXPECT_EQ(item, slice.dest_items[0]);
+}
+
+TEST(BlobSlice, SliceSingleItem) {
+  const std::string kBlobUUID = "kId";
+  const size_t kSize = 5u;
+
+  InternalBlobData data;
+  scoped_refptr<ShareableBlobDataItem> item = CreateDataItem(kSize);
+  data.AppendSharedBlobItem(kBlobUUID, item);
+
+  BlobSlice slice(data, 1, 3);
+  EXPECT_EQ(3u, slice.copying_memory_size);
+  EXPECT_FALSE(slice.has_sliced_last_memory_item);
+  ExpectFirstSlice(slice, item, 1, 3);
+  ASSERT_EQ(1u, slice.dest_items.size());
+}
+
+TEST(BlobSlice, SliceSingleLastItem) {
+  const std::string kBlobUUID = "kId";
+  const size_t kSize1 = 5u;
+  const size_t kSize2 = 10u;
+
+  InternalBlobData data;
+  scoped_refptr<ShareableBlobDataItem> item1 = CreateDataItem(kSize1);
+  scoped_refptr<ShareableBlobDataItem> item2 = CreateDataItem(kSize2);
+  data.AppendSharedBlobItem(kBlobUUID, item1);
+  data.AppendSharedBlobItem(kBlobUUID, item2);
+
+  BlobSlice slice(data, 6, 2);
+  EXPECT_EQ(2u, slice.copying_memory_size);
+  ExpectFirstSlice(slice, item2, 1, 2);
+  ASSERT_EQ(1u, slice.dest_items.size());
+}
+
+TEST(BlobSlice, SliceAcrossTwoItems) {
+  const std::string kBlobUUID = "kId";
+  const size_t kSize1 = 5u;
+  const size_t kSize2 = 10u;
+
+  InternalBlobData data;
+  scoped_refptr<ShareableBlobDataItem> item1 = CreateDataItem(kSize1);
+  scoped_refptr<ShareableBlobDataItem> item2 = CreateDataItem(kSize2);
+  data.AppendSharedBlobItem(kBlobUUID, item1);
+  data.AppendSharedBlobItem(kBlobUUID, item2);
+
+  BlobSlice slice(data, 4, 10);
+  EXPECT_EQ(10u, slice.copying_memory_size);
+  ExpectFirstSlice(slice, item1, 4, 1);
+  ExpectLastSlice(slice, item2, 9);
+  ASSERT_EQ(2u, slice.dest_items.size());
+}
+
+TEST(BlobSlice, SliceFileAndLastItem) {
+  const std::string kBlobUUID = "kId";
+  const size_t kSize1 = 5u;
+  const size_t kSize2 = 10u;
+
+  InternalBlobData data;
+  scoped_refptr<ShareableBlobDataItem> item1 = CreateFileItem(0u, kSize1);
+  scoped_refptr<ShareableBlobDataItem> item2 = CreateDataItem(kSize2);
+  data.AppendSharedBlobItem(kBlobUUID, item1);
+  data.AppendSharedBlobItem(kBlobUUID, item2);
+
+  BlobSlice slice(data, 4, 2);
+  EXPECT_EQ(1u, slice.copying_memory_size);
+  EXPECT_FALSE(slice.has_sliced_first_memory_item);
+  ExpectLastSlice(slice, item2, 1);
+  ASSERT_EQ(2u, slice.dest_items.size());
+
+  EXPECT_EQ(*CreateFileItem(4u, 1u)->item(), *slice.dest_items[0]->item());
+}
+
+TEST(BlobSlice, SliceAcrossLargeItem) {
+  const std::string kBlobUUID = "kId";
+  const size_t kSize1 = 5u;
+  const size_t kSize2 = 10u;
+  const size_t kSize3 = 10u;
+
+  InternalBlobData data;
+  scoped_refptr<ShareableBlobDataItem> item1 = CreateDataItem(kSize1);
+  scoped_refptr<ShareableBlobDataItem> item2 = CreateFileItem(0u, kSize2);
+  scoped_refptr<ShareableBlobDataItem> item3 = CreateDataItem(kSize3);
+  data.AppendSharedBlobItem(kBlobUUID, item1);
+  data.AppendSharedBlobItem(kBlobUUID, item2);
+  data.AppendSharedBlobItem(kBlobUUID, item3);
+
+  BlobSlice slice(data, 2, 20);
+  EXPECT_EQ(3u + 7u, slice.copying_memory_size);
+  ExpectFirstSlice(slice, item1, 2, 3);
+  ExpectLastSlice(slice, item3, 7);
+  ASSERT_EQ(3u, slice.dest_items.size());
+
+  EXPECT_EQ(*item2, *slice.dest_items[1]);
+}
+
+}  // namespace
+}  // namespace storage