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// Copyright (c) 2015 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_data_builder.h"
#include <stddef.h>
#include <stdint.h>
#include <utility>
#include "base/numerics/safe_conversions.h"
#include "base/numerics/safe_math.h"
#include "base/time/time.h"
#include "net/disk_cache/disk_cache.h"
#include "storage/browser/blob/shareable_file_reference.h"
namespace storage {
const char BlobDataBuilder::kAppendFutureFileTemporaryFileName[] =
"kFakeFilenameToBeChangedByPopulateFutureFile";
BlobDataBuilder::BlobDataBuilder(const std::string& uuid) : uuid_(uuid) {
}
BlobDataBuilder::~BlobDataBuilder() {
}
void BlobDataBuilder::AppendIPCDataElement(const DataElement& ipc_data) {
uint64_t length = ipc_data.length();
switch (ipc_data.type()) {
case DataElement::TYPE_BYTES:
DCHECK(!ipc_data.offset());
AppendData(ipc_data.bytes(),
base::checked_cast<size_t, uint64_t>(length));
break;
case DataElement::TYPE_FILE:
AppendFile(ipc_data.path(), ipc_data.offset(), length,
ipc_data.expected_modification_time());
break;
case DataElement::TYPE_FILE_FILESYSTEM:
AppendFileSystemFile(ipc_data.filesystem_url(), ipc_data.offset(), length,
ipc_data.expected_modification_time());
break;
case DataElement::TYPE_BLOB:
// This is a temporary item that will be deconstructed later in
// BlobStorageContext.
AppendBlob(ipc_data.blob_uuid(), ipc_data.offset(), ipc_data.length());
break;
case DataElement::TYPE_BYTES_DESCRIPTION:
case DataElement::TYPE_UNKNOWN:
case DataElement::TYPE_DISK_CACHE_ENTRY: // This type can't be sent by IPC.
NOTREACHED();
break;
}
}
void BlobDataBuilder::AppendData(const char* data, size_t length) {
if (!length)
return;
scoped_ptr<DataElement> element(new DataElement());
element->SetToBytes(data, length);
items_.push_back(new BlobDataItem(std::move(element)));
}
size_t BlobDataBuilder::AppendFutureData(size_t length) {
CHECK_NE(length, 0u);
scoped_ptr<DataElement> element(new DataElement());
element->SetToBytesDescription(length);
items_.push_back(new BlobDataItem(std::move(element)));
return items_.size() - 1;
}
bool BlobDataBuilder::PopulateFutureData(size_t index,
const char* data,
size_t offset,
size_t length) {
DCHECK_LT(index, items_.size());
DCHECK(data);
DataElement* element = items_.at(index)->data_element_ptr();
// We lazily allocate our data buffer by waiting until the first
// PopulateFutureData call.
// Why? The reason we have the AppendFutureData method is to create our Blob
// record when the Renderer tells us about the blob without actually
// allocating the memory yet, as we might not have the quota yet. So we don't
// want to allocate the memory until we're actually receiving the data (which
// the browser process only does when it has quota).
if (element->type() == DataElement::TYPE_BYTES_DESCRIPTION) {
element->SetToAllocatedBytes(element->length());
// The type of the element is now TYPE_BYTES.
}
if (element->type() != DataElement::TYPE_BYTES) {
DVLOG(1) << "Invalid item type.";
return false;
}
base::CheckedNumeric<size_t> checked_end = offset;
checked_end += length;
if (!checked_end.IsValid() || checked_end.ValueOrDie() > element->length()) {
DVLOG(1) << "Invalid offset or length.";
return false;
}
std::memcpy(element->mutable_bytes() + offset, data, length);
return true;
}
size_t BlobDataBuilder::AppendFutureFile(uint64_t offset, uint64_t length) {
CHECK_NE(length, 0ull);
scoped_ptr<DataElement> element(new DataElement());
element->SetToFilePathRange(base::FilePath::FromUTF8Unsafe(std::string(
kAppendFutureFileTemporaryFileName)),
offset, length, base::Time());
items_.push_back(new BlobDataItem(std::move(element)));
return items_.size() - 1;
}
bool BlobDataBuilder::PopulateFutureFile(
size_t index,
const scoped_refptr<ShareableFileReference>& file_reference,
const base::Time& expected_modification_time) {
DCHECK_LT(index, items_.size());
DataElement* old_element = items_.at(index)->data_element_ptr();
if (old_element->type() != DataElement::TYPE_FILE) {
DVLOG(1) << "Invalid item type.";
return false;
} else if (old_element->path().AsUTF8Unsafe() !=
std::string(kAppendFutureFileTemporaryFileName)) {
DVLOG(1) << "Item not created by AppendFutureFile";
return false;
}
uint64_t length = old_element->length();
uint64_t offset = old_element->offset();
scoped_ptr<DataElement> element(new DataElement());
element->SetToFilePathRange(file_reference->path(), offset, length,
expected_modification_time);
items_[index] = new BlobDataItem(std::move(element), file_reference);
return true;
}
void BlobDataBuilder::AppendFile(const base::FilePath& file_path,
uint64_t offset,
uint64_t length,
const base::Time& expected_modification_time) {
scoped_ptr<DataElement> element(new DataElement());
element->SetToFilePathRange(file_path, offset, length,
expected_modification_time);
items_.push_back(new BlobDataItem(std::move(element),
ShareableFileReference::Get(file_path)));
}
void BlobDataBuilder::AppendBlob(const std::string& uuid,
uint64_t offset,
uint64_t length) {
DCHECK_GT(length, 0ul);
scoped_ptr<DataElement> element(new DataElement());
element->SetToBlobRange(uuid, offset, length);
items_.push_back(new BlobDataItem(std::move(element)));
}
void BlobDataBuilder::AppendBlob(const std::string& uuid) {
scoped_ptr<DataElement> element(new DataElement());
element->SetToBlob(uuid);
items_.push_back(new BlobDataItem(std::move(element)));
}
void BlobDataBuilder::AppendFileSystemFile(
const GURL& url,
uint64_t offset,
uint64_t length,
const base::Time& expected_modification_time) {
DCHECK_GT(length, 0ul);
scoped_ptr<DataElement> element(new DataElement());
element->SetToFileSystemUrlRange(url, offset, length,
expected_modification_time);
items_.push_back(new BlobDataItem(std::move(element)));
}
void BlobDataBuilder::AppendDiskCacheEntry(
const scoped_refptr<DataHandle>& data_handle,
disk_cache::Entry* disk_cache_entry,
int disk_cache_stream_index) {
scoped_ptr<DataElement> element(new DataElement());
element->SetToDiskCacheEntryRange(
0U, disk_cache_entry->GetDataSize(disk_cache_stream_index));
items_.push_back(new BlobDataItem(std::move(element), data_handle,
disk_cache_entry, disk_cache_stream_index));
}
void BlobDataBuilder::Clear() {
items_.clear();
content_disposition_.clear();
content_type_.clear();
uuid_.clear();
}
void PrintTo(const BlobDataBuilder& x, std::ostream* os) {
DCHECK(os);
*os << "<BlobDataBuilder>{uuid: " << x.uuid()
<< ", content_type: " << x.content_type_
<< ", content_disposition: " << x.content_disposition_ << ", items: [";
for (const auto& item : x.items_) {
PrintTo(*item, os);
*os << ", ";
}
*os << "]}";
}
} // namespace storage
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