dmichael@chromium.org | c0c370e | 2014-04-25 09:07:30 +0900 | [diff] [blame] | 1 | // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "ipc/message_filter_router.h" |
| 6 | |
avi | 42ebda4 | 2015-12-22 11:39:04 +0900 | [diff] [blame] | 7 | #include <stddef.h> |
tfarina | 1cbfa08 | 2015-09-05 03:47:57 +0900 | [diff] [blame] | 8 | #include <stdint.h> |
| 9 | |
avi | 42ebda4 | 2015-12-22 11:39:04 +0900 | [diff] [blame] | 10 | #include "base/macros.h" |
dmichael@chromium.org | c0c370e | 2014-04-25 09:07:30 +0900 | [diff] [blame] | 11 | #include "ipc/ipc_message_macros.h" |
| 12 | #include "ipc/ipc_message_utils.h" |
| 13 | #include "ipc/message_filter.h" |
| 14 | |
| 15 | namespace IPC { |
| 16 | |
| 17 | namespace { |
| 18 | |
| 19 | bool TryFiltersImpl(MessageFilterRouter::MessageFilters& filters, |
| 20 | const IPC::Message& message) { |
| 21 | for (size_t i = 0; i < filters.size(); ++i) { |
| 22 | if (filters[i]->OnMessageReceived(message)) { |
| 23 | return true; |
| 24 | } |
| 25 | } |
| 26 | return false; |
| 27 | } |
| 28 | |
| 29 | bool RemoveFilterImpl(MessageFilterRouter::MessageFilters& filters, |
| 30 | MessageFilter* filter) { |
| 31 | MessageFilterRouter::MessageFilters::iterator it = |
| 32 | std::remove(filters.begin(), filters.end(), filter); |
| 33 | if (it == filters.end()) |
| 34 | return false; |
| 35 | |
| 36 | filters.erase(it, filters.end()); |
| 37 | return true; |
| 38 | } |
| 39 | |
| 40 | bool ValidMessageClass(int message_class) { |
| 41 | return message_class >= 0 && message_class < LastIPCMsgStart; |
| 42 | } |
| 43 | |
| 44 | } // namespace |
| 45 | |
| 46 | MessageFilterRouter::MessageFilterRouter() {} |
| 47 | MessageFilterRouter::~MessageFilterRouter() {} |
| 48 | |
| 49 | void MessageFilterRouter::AddFilter(MessageFilter* filter) { |
| 50 | // Determine if the filter should be applied to all messages, or only |
| 51 | // messages of a certain class. |
tfarina | 1cbfa08 | 2015-09-05 03:47:57 +0900 | [diff] [blame] | 52 | std::vector<uint32_t> supported_message_classes; |
dmichael@chromium.org | c0c370e | 2014-04-25 09:07:30 +0900 | [diff] [blame] | 53 | if (filter->GetSupportedMessageClasses(&supported_message_classes)) { |
| 54 | DCHECK(!supported_message_classes.empty()); |
| 55 | for (size_t i = 0; i < supported_message_classes.size(); ++i) { |
| 56 | const int message_class = supported_message_classes[i]; |
| 57 | DCHECK(ValidMessageClass(message_class)); |
| 58 | // Safely ignore repeated subscriptions to a given message class for the |
| 59 | // current filter being added. |
| 60 | if (!message_class_filters_[message_class].empty() && |
| 61 | message_class_filters_[message_class].back() == filter) { |
| 62 | continue; |
| 63 | } |
| 64 | message_class_filters_[message_class].push_back(filter); |
| 65 | } |
| 66 | } else { |
| 67 | global_filters_.push_back(filter); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | void MessageFilterRouter::RemoveFilter(MessageFilter* filter) { |
| 72 | if (RemoveFilterImpl(global_filters_, filter)) |
| 73 | return; |
| 74 | |
| 75 | for (size_t i = 0; i < arraysize(message_class_filters_); ++i) |
| 76 | RemoveFilterImpl(message_class_filters_[i], filter); |
| 77 | } |
| 78 | |
| 79 | bool MessageFilterRouter::TryFilters(const Message& message) { |
| 80 | if (TryFiltersImpl(global_filters_, message)) |
| 81 | return true; |
| 82 | |
| 83 | const int message_class = IPC_MESSAGE_CLASS(message); |
| 84 | if (!ValidMessageClass(message_class)) |
| 85 | return false; |
| 86 | |
| 87 | return TryFiltersImpl(message_class_filters_[message_class], message); |
| 88 | } |
| 89 | |
| 90 | void MessageFilterRouter::Clear() { |
| 91 | global_filters_.clear(); |
| 92 | for (size_t i = 0; i < arraysize(message_class_filters_); ++i) |
| 93 | message_class_filters_[i].clear(); |
| 94 | } |
| 95 | |
| 96 | } // namespace IPC |