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// Copyright (c) 2010 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/blob/blob_storage_controller.h"
#include "base/logging.h"
#include "googleurl/src/gurl.h"
#include "net/base/upload_data.h"
#include "webkit/blob/blob_data.h"
namespace webkit_blob {
BlobStorageController::BlobStorageController() {
}
BlobStorageController::~BlobStorageController() {
}
void BlobStorageController::RegisterBlobUrl(
const GURL& url, const BlobData* blob_data) {
scoped_refptr<BlobData> target_blob_data(new BlobData());
target_blob_data->set_content_type(blob_data->content_type());
target_blob_data->set_content_disposition(blob_data->content_disposition());
// 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.
// All the Blob items in the passing blob data are resolved and expanded into
// a set of Data and File items.
for (std::vector<BlobData::Item>::const_iterator iter =
blob_data->items().begin();
iter != blob_data->items().end(); ++iter) {
switch (iter->type()) {
case BlobData::TYPE_DATA: {
// WebBlobData does not allow partial data.
DCHECK(!(iter->offset()) && iter->length() == iter->data().size());
target_blob_data->AppendData(iter->data());
break;
}
case BlobData::TYPE_FILE:
AppendFileItem(target_blob_data,
iter->file_path(),
iter->offset(),
iter->length(),
iter->expected_modification_time());
break;
case BlobData::TYPE_BLOB: {
BlobData* src_blob_data = GetBlobDataFromUrl(iter->blob_url());
DCHECK(src_blob_data);
if (src_blob_data)
AppendStorageItems(target_blob_data.get(),
src_blob_data,
iter->offset(),
iter->length());
break;
}
}
}
blob_map_[url.spec()] = target_blob_data;
}
void BlobStorageController::RegisterBlobUrlFrom(
const GURL& url, const GURL& src_url) {
BlobData* blob_data = GetBlobDataFromUrl(src_url);
DCHECK(blob_data);
if (!blob_data)
return;
blob_map_[url.spec()] = blob_data;
}
void BlobStorageController::UnregisterBlobUrl(const GURL& url) {
blob_map_.erase(url.spec());
}
BlobData* BlobStorageController::GetBlobDataFromUrl(const GURL& url) {
BlobMap::iterator found = blob_map_.find(url.spec());
return (found != blob_map_.end()) ? found->second : NULL;
}
void BlobStorageController::ResolveBlobReferencesInUploadData(
net::UploadData* upload_data) {
DCHECK(upload_data);
std::vector<net::UploadData::Element>* uploads = upload_data->elements();
std::vector<net::UploadData::Element>::iterator iter;
for (iter = uploads->begin(); iter != uploads->end();) {
if (iter->type() != net::UploadData::TYPE_BLOB) {
iter++;
continue;
}
// Find the referred blob data.
webkit_blob::BlobData* blob_data = GetBlobDataFromUrl(iter->blob_url());
DCHECK(blob_data);
if (!blob_data) {
// TODO(jianli): We should probably fail uploading the data
iter++;
continue;
}
// Remove this element.
iter = uploads->erase(iter);
// If there is no element in the referred blob data, continue the loop.
// Note that we should not increase iter since it already points to the one
// after the removed element.
if (blob_data->items().empty())
continue;
// Insert the elements in the referred blob data.
// Note that we traverse from the bottom so that the elements can be
// inserted in the original order.
for (size_t i = blob_data->items().size(); i > 0; --i) {
iter = uploads->insert(iter, net::UploadData::Element());
const webkit_blob::BlobData::Item& item = blob_data->items().at(i - 1);
switch (item.type()) {
case webkit_blob::BlobData::TYPE_DATA:
// TODO(jianli): Figure out how to avoid copying the data.
iter->SetToBytes(
&item.data().at(0) + static_cast<int>(item.offset()),
static_cast<int>(item.length()));
break;
case webkit_blob::BlobData::TYPE_FILE:
// TODO(michaeln): Ensure that any temp files survive till the
// net::URLRequest is done with the upload.
iter->SetToFilePathRange(
item.file_path(),
item.offset(),
item.length(),
item.expected_modification_time());
break;
default:
NOTREACHED();
break;
}
}
}
}
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::TYPE_DATA) {
target_blob_data->AppendData(iter->data(),
static_cast<uint32>(iter->offset() + offset),
static_cast<uint32>(new_length));
} else {
DCHECK(iter->type() == BlobData::TYPE_FILE);
AppendFileItem(target_blob_data,
iter->file_path(),
iter->offset() + offset,
new_length,
iter->expected_modification_time());
}
length -= new_length;
offset = 0;
}
}
void BlobStorageController::AppendFileItem(
BlobData* target_blob_data,
const 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<DeletableFileReference> deletable_file =
DeletableFileReference::Get(file_path);
if (deletable_file)
target_blob_data->AttachDeletableFileReference(deletable_file);
}
} // namespace webkit_blob
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