Chromium Blob hacking

webkit/browser/blob/blob_storage_controller.cc

Index: webkit/browser/blob/blob_storage_controller.cc
diff --git a/webkit/browser/blob/blob_storage_controller.cc b/webkit/browser/blob/blob_storage_controller.cc
deleted file mode 100644
index f5dd60ec99e0f953104fdec0656dfe8e9fc24115..0000000000000000000000000000000000000000
--- a/webkit/browser/blob/blob_storage_controller.cc
+++ /dev/null
@@ -1,257 +0,0 @@
-// 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.
-
-#include "webkit/browser/blob/blob_storage_controller.h"
-
-#include "base/logging.h"
-#include "url/gurl.h"
-#include "webkit/common/blob/blob_data.h"
-
-namespace webkit_blob {
-
-namespace {
-
-// We can't use GURL directly for these hash fragment manipulations
-// since it doesn't have specific knowlege of the BlobURL format. GURL
-// treats BlobURLs as if they were PathURLs which don't support hash
-// fragments.
-
-bool BlobUrlHasRef(const GURL& url) {
-  return url.spec().find('#') != std::string::npos;
-}
-
-GURL ClearBlobUrlRef(const GURL& url) {
-  size_t hash_pos = url.spec().find('#');
-  if (hash_pos == std::string::npos)
-    return url;
-  return GURL(url.spec().substr(0, hash_pos));
-}
-
-static const int64 kMaxMemoryUsage = 1024 * 1024 * 1024;  // 1G
-
-}  // namespace
-
-BlobStorageController::BlobStorageController()
-    : memory_usage_(0) {
-}
-
-BlobStorageController::~BlobStorageController() {
-}
-
-void BlobStorageController::StartBuildingBlob(const GURL& url) {
-  DCHECK(url.SchemeIs("blob"));
-  DCHECK(!BlobUrlHasRef(url));
-  BlobData* blob_data = new BlobData;
-  unfinalized_blob_map_[url.spec()] = blob_data;
-  IncrementBlobDataUsage(blob_data);
-}
-
-void BlobStorageController::AppendBlobDataItem(
-    const GURL& url, const BlobData::Item& item) {
-  DCHECK(url.SchemeIs("blob"));
-  DCHECK(!BlobUrlHasRef(url));
-  BlobMap::iterator found = unfinalized_blob_map_.find(url.spec());
-  if (found == unfinalized_blob_map_.end())
-    return;
-  BlobData* target_blob_data = found->second.get();
-  DCHECK(target_blob_data);
-
-  memory_usage_ -= target_blob_data->GetMemoryUsage();
-
-  // The blob data is stored in the "canonical" way. That is, it only contains a
-  // list of Data and File items.
-  // 1) The Data item is denoted by the raw data and the range.
-  // 2) The File item is denoted by the file path, the range and the expected
-  //    modification time.
-  // 3) The FileSystem File item is denoted by the FileSystem URL, the range
-  //    and the expected modification time.
-  // All the Blob items in the passing blob data are resolved and expanded into
-  // a set of Data and File items.
-
-  DCHECK(item.length() > 0);
-  switch (item.type()) {
-    case BlobData::Item::TYPE_BYTES:
-      DCHECK(!item.offset());
-      target_blob_data->AppendData(item.bytes(), item.length());
-      break;
-    case BlobData::Item::TYPE_FILE:
-      AppendFileItem(target_blob_data,
-                     item.path(),
-                     item.offset(),
-                     item.length(),
-                     item.expected_modification_time());
-      break;
-    case BlobData::Item::TYPE_FILE_FILESYSTEM:
-      AppendFileSystemFileItem(target_blob_data,
-                               item.url(),
-                               item.offset(),
-                               item.length(),
-                               item.expected_modification_time());
-      break;
-    case BlobData::Item::TYPE_BLOB: {
-      BlobData* src_blob_data = GetBlobDataFromUrl(item.url());
-      DCHECK(src_blob_data);
-      if (src_blob_data)
-        AppendStorageItems(target_blob_data,
-                           src_blob_data,
-                           item.offset(),
-                           item.length());
-      break;
-    }
-    default:
-      NOTREACHED();
-      break;
-  }
-
-  memory_usage_ += target_blob_data->GetMemoryUsage();
-
-  // If we're using too much memory, drop this blob.
-  // TODO(michaeln): Blob memory storage does not yet spill over to disk,
-  // until it does, we'll prevent memory usage over a max amount.
-  if (memory_usage_ > kMaxMemoryUsage)
-    RemoveBlob(url);
-}
-
-void BlobStorageController::FinishBuildingBlob(
-    const GURL& url, const std::string& content_type) {
-  DCHECK(url.SchemeIs("blob"));
-  DCHECK(!BlobUrlHasRef(url));
-  BlobMap::iterator found = unfinalized_blob_map_.find(url.spec());
-  if (found == unfinalized_blob_map_.end())
-    return;
-  found->second->set_content_type(content_type);
-  blob_map_[url.spec()] = found->second;
-  unfinalized_blob_map_.erase(found);
-}
-
-void BlobStorageController::AddFinishedBlob(const GURL& url,
-                                            const BlobData* data) {
-  StartBuildingBlob(url);
-  for (std::vector<BlobData::Item>::const_iterator iter =
-           data->items().begin();
-       iter != data->items().end(); ++iter) {
-    AppendBlobDataItem(url, *iter);
-  }
-  FinishBuildingBlob(url, data->content_type());
-}
-
-void BlobStorageController::CloneBlob(
-    const GURL& url, const GURL& src_url) {
-  DCHECK(url.SchemeIs("blob"));
-  DCHECK(!BlobUrlHasRef(url));
-
-  BlobData* blob_data = GetBlobDataFromUrl(src_url);
-  DCHECK(blob_data);
-  if (!blob_data)
-    return;
-
-  blob_map_[url.spec()] = blob_data;
-  IncrementBlobDataUsage(blob_data);
-}
-
-void BlobStorageController::RemoveBlob(const GURL& url) {
-  DCHECK(url.SchemeIs("blob"));
-  DCHECK(!BlobUrlHasRef(url));
-
-  if (!RemoveFromMapHelper(&unfinalized_blob_map_, url))
-    RemoveFromMapHelper(&blob_map_, url);
-}
-
-bool BlobStorageController::RemoveFromMapHelper(
-    BlobMap* map, const GURL& url) {
-  BlobMap::iterator found = map->find(url.spec());
-  if (found == map->end())
-    return false;
-  if (DecrementBlobDataUsage(found->second.get()))
-    memory_usage_ -= found->second->GetMemoryUsage();
-  map->erase(found);
-  return true;
-}
-
-
-BlobData* BlobStorageController::GetBlobDataFromUrl(const GURL& url) {
-  BlobMap::iterator found = blob_map_.find(
-      BlobUrlHasRef(url) ? ClearBlobUrlRef(url).spec() : url.spec());
-  return (found != blob_map_.end()) ? found->second.get() : NULL;
-}
-
-void BlobStorageController::AppendStorageItems(
-    BlobData* target_blob_data, BlobData* src_blob_data,
-    uint64 offset, uint64 length) {
-  DCHECK(target_blob_data && src_blob_data &&
-         length != static_cast<uint64>(-1));
-
-  std::vector<BlobData::Item>::const_iterator iter =
-      src_blob_data->items().begin();
-  if (offset) {
-    for (; iter != src_blob_data->items().end(); ++iter) {
-      if (offset >= iter->length())
-        offset -= iter->length();
-      else
-        break;
-    }
-  }
-
-  for (; iter != src_blob_data->items().end() && length > 0; ++iter) {
-    uint64 current_length = iter->length() - offset;
-    uint64 new_length = current_length > length ? length : current_length;
-    if (iter->type() == BlobData::Item::TYPE_BYTES) {
-      target_blob_data->AppendData(
-          iter->bytes() + static_cast<size_t>(iter->offset() + offset),
-          static_cast<uint32>(new_length));
-    } else if (iter->type() == BlobData::Item::TYPE_FILE) {
-      AppendFileItem(target_blob_data,
-                     iter->path(),
-                     iter->offset() + offset,
-                     new_length,
-                     iter->expected_modification_time());
-    } else {
-      DCHECK(iter->type() == BlobData::Item::TYPE_FILE_FILESYSTEM);
-      AppendFileSystemFileItem(target_blob_data,
-                               iter->url(),
-                               iter->offset() + offset,
-                               new_length,
-                               iter->expected_modification_time());
-    }
-    length -= new_length;
-    offset = 0;
-  }
-}
-
-void BlobStorageController::AppendFileItem(
-    BlobData* target_blob_data,
-    const base::FilePath& file_path, uint64 offset, uint64 length,
-    const base::Time& expected_modification_time) {
-  target_blob_data->AppendFile(file_path, offset, length,
-                               expected_modification_time);
-
-  // It may be a temporary file that should be deleted when no longer needed.
-  scoped_refptr<ShareableFileReference> shareable_file =
-      ShareableFileReference::Get(file_path);
-  if (shareable_file.get())
-    target_blob_data->AttachShareableFileReference(shareable_file.get());
-}
-
-void BlobStorageController::AppendFileSystemFileItem(
-    BlobData* target_blob_data,
-    const GURL& url, uint64 offset, uint64 length,
-    const base::Time& expected_modification_time) {
-  target_blob_data->AppendFileSystemFile(url, offset, length,
-                                         expected_modification_time);
-}
-
-void BlobStorageController::IncrementBlobDataUsage(BlobData* blob_data) {
-  blob_data_usage_count_[blob_data] += 1;
-}
-
-bool BlobStorageController::DecrementBlobDataUsage(BlobData* blob_data) {
-  BlobDataUsageMap::iterator found = blob_data_usage_count_.find(blob_data);
-  DCHECK(found != blob_data_usage_count_.end());
-  if (--(found->second))
-    return false;  // Still in use
-  blob_data_usage_count_.erase(found);
-  return true;
-}
-
-}  // namespace webkit_blob