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// Copyright 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.
#ifndef STORAGE_COMMON_BLOB_STORAGE_BLOB_ITEM_BYTES_REQUEST_H_
#define STORAGE_COMMON_BLOB_STORAGE_BLOB_ITEM_BYTES_REQUEST_H_
#include <stdint.h>
#include <ostream>
#include "base/basictypes.h"
#include "storage/common/blob_storage/blob_storage_constants.h"
#include "storage/common/storage_common_export.h"
namespace storage {
// This class is serialized over IPC to request bytes from a blob item.
struct STORAGE_COMMON_EXPORT BlobItemBytesRequest {
// Not using std::numeric_limits<T>::max() because of non-C++11 builds.
static const size_t kInvalidIndex = SIZE_MAX;
static const uint64_t kInvalidSize = UINT64_MAX;
static BlobItemBytesRequest CreateIPCRequest(size_t request_number,
size_t renderer_item_index,
size_t renderer_item_offset,
size_t size);
static BlobItemBytesRequest CreateSharedMemoryRequest(
size_t request_number,
size_t renderer_item_index,
size_t renderer_item_offset,
size_t size,
size_t handle_index,
uint64_t handle_offset);
static BlobItemBytesRequest CreateFileRequest(size_t request_number,
size_t renderer_item_index,
uint64_t renderer_item_offset,
uint64_t size,
size_t handle_index,
uint64_t handle_offset);
BlobItemBytesRequest();
BlobItemBytesRequest(size_t request_number,
IPCBlobItemRequestStrategy transport_strategy,
size_t renderer_item_index,
uint64_t renderer_item_offset,
uint64_t size,
size_t handle_index,
uint64_t handle_offset);
~BlobItemBytesRequest();
// The request number uniquely identifies the memory request. We can't use
// the renderer item index or browser item index as there can be multiple
// requests for both (as segmentation boundaries can exist in both).
size_t request_number;
IPCBlobItemRequestStrategy transport_strategy;
size_t renderer_item_index;
uint64_t renderer_item_offset;
uint64_t size;
size_t handle_index;
uint64_t handle_offset;
};
STORAGE_COMMON_EXPORT void PrintTo(const BlobItemBytesRequest& request,
std::ostream* os);
STORAGE_COMMON_EXPORT bool operator==(const BlobItemBytesRequest& a,
const BlobItemBytesRequest& b);
STORAGE_COMMON_EXPORT bool operator!=(const BlobItemBytesRequest& a,
const BlobItemBytesRequest& b);
} // namespace storage
#endif // STORAGE_COMMON_BLOB_STORAGE_BLOB_ITEM_BYTES_REQUEST_H_
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