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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef IPC_IPC_MESSAGE_H_
#define IPC_IPC_MESSAGE_H_
#include <stddef.h>
#include <stdint.h>
#include "base/gtest_prod_util.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/scoped_refptr.h"
#include "base/pickle.h"
#include "build/build_config.h"
#include "ipc/ipc_message_support_export.h"
namespace mojo {
namespace internal {
struct UnmappedNativeStructSerializerImpl;
}
} // namespace mojo
namespace IPC {
class MessageAttachmentSet;
// A message is essentially now nothing more than a pickle with an
// attachment set.
class IPC_MESSAGE_SUPPORT_EXPORT Message : public base::Pickle {
public:
Message();
// Initializes a message from a const block of data. The data is not copied;
// instead the data is merely referenced by this message. Only const methods
// should be used on the message when initialized this way.
Message(const char* data, size_t data_len);
Message(const Message& other);
Message& operator=(const Message& other);
~Message() override;
// WriteAttachment appends |attachment| to the end of the set. It returns
// false iff the set is full.
bool WriteAttachment(
scoped_refptr<base::Pickle::Attachment> attachment) override;
// ReadAttachment parses an attachment given the parsing state |iter| and
// writes it to |*attachment|. It returns true on success.
bool ReadAttachment(
base::PickleIterator* iter,
scoped_refptr<base::Pickle::Attachment>* attachment) const override;
// Returns true if there are any attachment in this message.
bool HasAttachments() const override;
protected:
friend class Channel;
friend class MessageReplyDeserializer;
friend struct mojo::internal::UnmappedNativeStructSerializerImpl;
#pragma pack(push, 4)
struct Header : base::Pickle::Header {
int32_t pad_routing = 0;
uint32_t pad_type = 0;
uint32_t pad_flags = 0;
#if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
uint16_t num_fds = 0;
uint16_t pad = 0;
#endif
};
#pragma pack(pop)
Header* header() {
return headerT<Header>();
}
const Header* header() const {
return headerT<Header>();
}
// Ensure that a MessageAttachmentSet is allocated
void EnsureMessageAttachmentSet();
MessageAttachmentSet* attachment_set() {
EnsureMessageAttachmentSet();
return attachment_set_.get();
}
const MessageAttachmentSet* attachment_set() const {
return attachment_set_.get();
}
// The set of file descriptors associated with this message.
scoped_refptr<MessageAttachmentSet> attachment_set_;
FRIEND_TEST_ALL_PREFIXES(IPCMessageTest, FindNext);
FRIEND_TEST_ALL_PREFIXES(IPCMessageTest, FindNextOverflow);
};
} // namespace IPC
#endif // IPC_IPC_MESSAGE_H_
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