common_param_traits.h

// Copyright (c) 2011 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.

// This file is used to define IPC::ParamTraits<> specializations for a number
// of types so that they can be serialized over IPC.  IPC::ParamTraits<>
// specializations for basic types (like int and std::string) and types in the
// 'base' project can be found in ipc/ipc_message_utils.h.  This file contains
// specializations for types that are used by the content code, and which need
// manual serialization code.  This is usually because they're not structs with
// public members..

#ifndef CONTENT_COMMON_COMMON_PARAM_TRAITS_H_
#define CONTENT_COMMON_COMMON_PARAM_TRAITS_H_
#pragma once

#include "base/memory/ref_counted.h"
#include "base/platform_file.h"
#include "content/common/content_export.h"
#include "content/common/dom_storage_common.h"
#include "googleurl/src/gurl.h"
#include "ipc/ipc_message_utils.h"
#include "net/base/ip_endpoint.h"
#include "net/url_request/url_request_status.h"
#include "ui/gfx/native_widget_types.h"
#include "ui/gfx/surface/transport_dib.h"
#include "webkit/glue/resource_type.h"

class SkBitmap;

namespace gfx {
class Point;
class Rect;
class Size;
}  // namespace gfx

namespace net {
class HttpResponseHeaders;
class HostPortPair;
class UploadData;
}

namespace ui {
class Range;
}

namespace IPC {

template <>
struct CONTENT_EXPORT ParamTraits<GURL> {
  typedef GURL param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* p);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct ParamTraits<ResourceType::Type> {
  typedef ResourceType::Type param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* p);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct CONTENT_EXPORT ParamTraits<net::URLRequestStatus> {
  typedef net::URLRequestStatus param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* r);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct CONTENT_EXPORT ParamTraits<scoped_refptr<net::UploadData> > {
  typedef scoped_refptr<net::UploadData> param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* r);
  static void Log(const param_type& p, std::string* l);
};

template<>
struct CONTENT_EXPORT ParamTraits<net::HostPortPair> {
  typedef net::HostPortPair param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* r);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct ParamTraits<scoped_refptr<net::HttpResponseHeaders> > {
  typedef scoped_refptr<net::HttpResponseHeaders> param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* r);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct ParamTraits<net::IPEndPoint> {
  typedef net::IPEndPoint param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* p);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct ParamTraits<base::PlatformFileInfo> {
  typedef base::PlatformFileInfo param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* r);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct CONTENT_EXPORT ParamTraits<gfx::Point> {
  typedef gfx::Point param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* r);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct CONTENT_EXPORT ParamTraits<gfx::Size> {
  typedef gfx::Size param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* r);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct CONTENT_EXPORT ParamTraits<gfx::Rect> {
  typedef gfx::Rect param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* r);
  static void Log(const param_type& p, std::string* l);
};

template <>
struct ParamTraits<gfx::NativeWindow> {
  typedef gfx::NativeWindow param_type;
  static void Write(Message* m, const param_type& p) {
#if defined(OS_WIN)
    // HWNDs are always 32 bits on Windows, even on 64 bit systems.
    m->WriteUInt32(reinterpret_cast<uint32>(p));
#else
    m->WriteData(reinterpret_cast<const char*>(&p), sizeof(p));
#endif
  }
  static bool Read(const Message* m, void** iter, param_type* r) {
#if defined(OS_WIN)
    return m->ReadUInt32(iter, reinterpret_cast<uint32*>(r));
#else
    const char *data;
    int data_size = 0;
    bool result = m->ReadData(iter, &data, &data_size);
    if (result && data_size == sizeof(gfx::NativeWindow)) {
      memcpy(r, data, sizeof(gfx::NativeWindow));
    } else {
      result = false;
      NOTREACHED();
    }
    return result;
#endif
  }
  static void Log(const param_type& p, std::string* l) {
    l->append("<gfx::NativeWindow>");
  }
};

template <>
struct CONTENT_EXPORT ParamTraits<ui::Range> {
  typedef ui::Range param_type;
  static void Write(Message* m, const param_type& p);
  static bool Read(const Message* m, void** iter, param_type* r);
  static void Log(const param_type& p, std::string* l);
};

#if defined(OS_WIN)
template<>
struct ParamTraits<TransportDIB::Id> {
  typedef TransportDIB::Id param_type;
  static void Write(Message* m, const param_type& p) {
    WriteParam(m, p.handle);
    WriteParam(m, p.sequence_num);
  }
  static bool Read(const Message* m, void** iter, param_type* r) {
    return (ReadParam(m, iter, &r->handle) &&
            ReadParam(m, iter, &r->sequence_num));
  }
  static void Log(const param_type& p, std::string* l) {
    l->append("TransportDIB(");
    LogParam(p.handle, l);
    l->append(", ");
    LogParam(p.sequence_num, l);
    l->append(")");
  }
};
#endif

#if defined(USE_X11)
template<>
struct ParamTraits<TransportDIB::Id> {
  typedef TransportDIB::Id param_type;
  static void Write(Message* m, const param_type& p) {
    WriteParam(m, p.shmkey);
  }
  static bool Read(const Message* m, void** iter, param_type* r) {
    return ReadParam(m, iter, &r->shmkey);
  }
  static void Log(const param_type& p, std::string* l) {
    l->append("TransportDIB(");
    LogParam(p.shmkey, l);
    l->append(")");
  }
};
#endif

template <>
struct CONTENT_EXPORT ParamTraits<SkBitmap> {
  typedef SkBitmap param_type;
  static void Write(Message* m, const param_type& p);

  // Note: This function expects parameter |r| to be of type &SkBitmap since
  // r->SetConfig() and r->SetPixels() are called.
  static bool Read(const Message* m, void** iter, param_type* r);

  static void Log(const param_type& p, std::string* l);
};

template <>
struct SimilarTypeTraits<base::PlatformFileError> {
  typedef int Type;
};

template <>
struct SimilarTypeTraits<DOMStorageType> {
  typedef int Type;
};

}  // namespace IPC

#endif  // CONTENT_COMMON_COMMON_PARAM_TRAITS_H_