| // Copyright (c) 2012 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 "ipc/ipc_message.h" |
| |
| #include <limits.h> |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include "base/atomic_sequence_num.h" |
| #include "base/logging.h" |
| #include "build/build_config.h" |
| #include "ipc/ipc_message_attachment.h" |
| #include "ipc/ipc_message_attachment_set.h" |
| |
| #if defined(OS_POSIX) |
| #include "base/file_descriptor_posix.h" |
| #include "ipc/ipc_platform_file_attachment_posix.h" |
| #endif |
| |
| namespace { |
| |
| base::StaticAtomicSequenceNumber g_ref_num; |
| |
| // Create a reference number for identifying IPC messages in traces. The return |
| // values has the reference number stored in the upper 24 bits, leaving the low |
| // 8 bits set to 0 for use as flags. |
| inline uint32_t GetRefNumUpper24() { |
| base::trace_event::TraceLog* trace_log = |
| base::trace_event::TraceLog::GetInstance(); |
| uint32_t pid = trace_log ? trace_log->process_id() : 0; |
| uint32_t count = g_ref_num.GetNext(); |
| // The 24 bit hash is composed of 14 bits of the count and 10 bits of the |
| // Process ID. With the current trace event buffer cap, the 14-bit count did |
| // not appear to wrap during a trace. Note that it is not a big deal if |
| // collisions occur, as this is only used for debugging and trace analysis. |
| return ((pid << 14) | (count & 0x3fff)) << 8; |
| } |
| |
| } // namespace |
| |
| namespace IPC { |
| |
| //------------------------------------------------------------------------------ |
| |
| Message::~Message() { |
| } |
| |
| Message::Message() : base::Pickle(sizeof(Header)) { |
| header()->routing = header()->type = 0; |
| header()->flags = GetRefNumUpper24(); |
| #if defined(OS_POSIX) |
| header()->num_fds = 0; |
| header()->pad = 0; |
| #endif |
| Init(); |
| } |
| |
| Message::Message(int32_t routing_id, uint32_t type, PriorityValue priority) |
| : base::Pickle(sizeof(Header)) { |
| header()->routing = routing_id; |
| header()->type = type; |
| DCHECK((priority & 0xffffff00) == 0); |
| header()->flags = priority | GetRefNumUpper24(); |
| #if defined(OS_POSIX) |
| header()->num_fds = 0; |
| header()->pad = 0; |
| #endif |
| Init(); |
| } |
| |
| Message::Message(const char* data, int data_len) |
| : base::Pickle(data, data_len) { |
| Init(); |
| } |
| |
| Message::Message(const Message& other) : base::Pickle(other) { |
| Init(); |
| attachment_set_ = other.attachment_set_; |
| } |
| |
| void Message::Init() { |
| dispatch_error_ = false; |
| #if BUILDFLAG(IPC_MESSAGE_LOG_ENABLED) |
| received_time_ = 0; |
| dont_log_ = false; |
| log_data_ = NULL; |
| #endif |
| } |
| |
| Message& Message::operator=(const Message& other) { |
| *static_cast<base::Pickle*>(this) = other; |
| attachment_set_ = other.attachment_set_; |
| return *this; |
| } |
| |
| void Message::SetHeaderValues(int32_t routing, uint32_t type, uint32_t flags) { |
| // This should only be called when the message is already empty. |
| DCHECK(payload_size() == 0); |
| |
| header()->routing = routing; |
| header()->type = type; |
| header()->flags = flags; |
| } |
| |
| void Message::EnsureMessageAttachmentSet() { |
| if (attachment_set_.get() == NULL) |
| attachment_set_ = new MessageAttachmentSet; |
| } |
| |
| #if BUILDFLAG(IPC_MESSAGE_LOG_ENABLED) |
| void Message::set_sent_time(int64_t time) { |
| DCHECK((header()->flags & HAS_SENT_TIME_BIT) == 0); |
| header()->flags |= HAS_SENT_TIME_BIT; |
| WriteInt64(time); |
| } |
| |
| int64_t Message::sent_time() const { |
| if ((header()->flags & HAS_SENT_TIME_BIT) == 0) |
| return 0; |
| |
| const char* data = end_of_payload(); |
| data -= sizeof(int64_t); |
| return *(reinterpret_cast<const int64_t*>(data)); |
| } |
| |
| void Message::set_received_time(int64_t time) const { |
| received_time_ = time; |
| } |
| #endif // BUILDFLAG(IPC_MESSAGE_LOG_ENABLED) |
| |
| Message::NextMessageInfo::NextMessageInfo() |
| : message_size(0), message_found(false), pickle_end(nullptr), |
| message_end(nullptr) {} |
| Message::NextMessageInfo::~NextMessageInfo() {} |
| |
| // static |
| void Message::FindNext(const char* range_start, |
| const char* range_end, |
| NextMessageInfo* info) { |
| DCHECK(info); |
| info->message_found = false; |
| info->message_size = 0; |
| |
| size_t pickle_size = 0; |
| if (!base::Pickle::PeekNext(sizeof(Header), |
| range_start, range_end, &pickle_size)) |
| return; |
| |
| bool have_entire_pickle = |
| static_cast<size_t>(range_end - range_start) >= pickle_size; |
| |
| info->message_size = pickle_size; |
| |
| if (!have_entire_pickle) |
| return; |
| |
| const char* pickle_end = range_start + pickle_size; |
| |
| info->message_end = pickle_end; |
| |
| info->pickle_end = pickle_end; |
| info->message_found = true; |
| } |
| |
| bool Message::WriteAttachment( |
| scoped_refptr<base::Pickle::Attachment> attachment) { |
| size_t index; |
| bool success = attachment_set()->AddAttachment( |
| make_scoped_refptr(static_cast<MessageAttachment*>(attachment.get())), |
| &index); |
| DCHECK(success); |
| |
| // NOTE: If you add more data to the pickle, make sure to update |
| // PickleSizer::AddAttachment. |
| |
| // Write the index of the descriptor so that we don't have to |
| // keep the current descriptor as extra decoding state when deserialising. |
| WriteInt(static_cast<int>(index)); |
| |
| return success; |
| } |
| |
| bool Message::ReadAttachment( |
| base::PickleIterator* iter, |
| scoped_refptr<base::Pickle::Attachment>* attachment) const { |
| int index; |
| if (!iter->ReadInt(&index)) |
| return false; |
| |
| MessageAttachmentSet* attachment_set = attachment_set_.get(); |
| if (!attachment_set) |
| return false; |
| |
| *attachment = attachment_set->GetAttachmentAt(index); |
| |
| return nullptr != attachment->get(); |
| } |
| |
| bool Message::HasAttachments() const { |
| return attachment_set_.get() && !attachment_set_->empty(); |
| } |
| |
| } // namespace IPC |