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| 1 // Copyright 2015 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 "mojo/edk/system/data_pipe.h" | |
| 6 | |
| 7 #include <stddef.h> | |
| 8 #include <stdint.h> | |
| 9 #include <string.h> | |
| 10 | |
| 11 #include <algorithm> | |
| 12 #include <limits> | |
| 13 | |
| 14 #include "mojo/edk/system/configuration.h" | |
| 15 #include "mojo/edk/system/options_validation.h" | |
| 16 #include "mojo/edk/system/raw_channel.h" | |
| 17 #include "mojo/edk/system/transport_data.h" | |
| 18 | |
| 19 namespace mojo { | |
| 20 namespace edk { | |
| 21 | |
| 22 namespace { | |
| 23 | |
| 24 const uint32_t kInvalidDataPipeHandleIndex = static_cast<uint32_t>(-1); | |
| 25 | |
| 26 struct MOJO_ALIGNAS(8) SerializedDataPipeHandleDispatcher { | |
| 27 MOJO_ALIGNAS(4) | |
| 28 uint32_t platform_handle_index; // (Or |kInvalidDataPipeHandleIndex|.) | |
| 29 | |
| 30 // These are from MojoCreateDataPipeOptions | |
| 31 MOJO_ALIGNAS(4) MojoCreateDataPipeOptionsFlags flags; | |
| 32 MOJO_ALIGNAS(4) uint32_t element_num_bytes; | |
| 33 MOJO_ALIGNAS(4) uint32_t capacity_num_bytes; | |
| 34 | |
| 35 MOJO_ALIGNAS(4) | |
| 36 uint32_t shared_memory_handle_index; // (Or |kInvalidDataPipeHandleIndex|.) | |
| 37 MOJO_ALIGNAS(4) uint32_t shared_memory_size; | |
| 38 }; | |
| 39 | |
| 40 } // namespace | |
| 41 | |
| 42 MojoCreateDataPipeOptions DataPipe::GetDefaultCreateOptions() { | |
| 43 MojoCreateDataPipeOptions result = { | |
| 44 static_cast<uint32_t>(sizeof(MojoCreateDataPipeOptions)), | |
| 45 MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE, | |
| 46 1u, | |
| 47 static_cast<uint32_t>( | |
| 48 GetConfiguration().default_data_pipe_capacity_bytes)}; | |
| 49 return result; | |
| 50 } | |
| 51 | |
| 52 MojoResult DataPipe::ValidateCreateOptions( | |
| 53 const MojoCreateDataPipeOptions* in_options, | |
| 54 MojoCreateDataPipeOptions* out_options) { | |
| 55 const MojoCreateDataPipeOptionsFlags kKnownFlags = | |
| 56 MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE; | |
| 57 | |
| 58 *out_options = GetDefaultCreateOptions(); | |
| 59 if (!in_options) | |
| 60 return MOJO_RESULT_OK; | |
| 61 | |
| 62 UserOptionsReader<MojoCreateDataPipeOptions> reader(in_options); | |
| 63 if (!reader.is_valid()) | |
| 64 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 65 | |
| 66 if (!OPTIONS_STRUCT_HAS_MEMBER(MojoCreateDataPipeOptions, flags, reader)) | |
| 67 return MOJO_RESULT_OK; | |
| 68 if ((reader.options().flags & ~kKnownFlags)) | |
| 69 return MOJO_RESULT_UNIMPLEMENTED; | |
| 70 out_options->flags = reader.options().flags; | |
| 71 | |
| 72 // Checks for fields beyond |flags|: | |
| 73 | |
| 74 if (!OPTIONS_STRUCT_HAS_MEMBER(MojoCreateDataPipeOptions, element_num_bytes, | |
| 75 reader)) | |
| 76 return MOJO_RESULT_OK; | |
| 77 if (reader.options().element_num_bytes == 0) | |
| 78 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 79 out_options->element_num_bytes = reader.options().element_num_bytes; | |
| 80 | |
| 81 if (!OPTIONS_STRUCT_HAS_MEMBER(MojoCreateDataPipeOptions, capacity_num_bytes, | |
| 82 reader) || | |
| 83 reader.options().capacity_num_bytes == 0) { | |
| 84 // Round the default capacity down to a multiple of the element size (but at | |
| 85 // least one element). | |
| 86 size_t default_data_pipe_capacity_bytes = | |
| 87 GetConfiguration().default_data_pipe_capacity_bytes; | |
| 88 out_options->capacity_num_bytes = | |
| 89 std::max(static_cast<uint32_t>(default_data_pipe_capacity_bytes - | |
| 90 (default_data_pipe_capacity_bytes % | |
| 91 out_options->element_num_bytes)), | |
| 92 out_options->element_num_bytes); | |
| 93 return MOJO_RESULT_OK; | |
| 94 } | |
| 95 if (reader.options().capacity_num_bytes % out_options->element_num_bytes != 0) | |
| 96 return MOJO_RESULT_INVALID_ARGUMENT; | |
| 97 if (reader.options().capacity_num_bytes > | |
| 98 GetConfiguration().max_data_pipe_capacity_bytes) | |
| 99 return MOJO_RESULT_RESOURCE_EXHAUSTED; | |
| 100 out_options->capacity_num_bytes = reader.options().capacity_num_bytes; | |
| 101 | |
| 102 return MOJO_RESULT_OK; | |
| 103 } | |
| 104 | |
| 105 void DataPipe::StartSerialize(bool have_channel_handle, | |
| 106 bool have_shared_memory, | |
| 107 size_t* max_size, | |
| 108 size_t* max_platform_handles) { | |
| 109 *max_size = sizeof(SerializedDataPipeHandleDispatcher); | |
| 110 *max_platform_handles = 0; | |
| 111 if (have_channel_handle) | |
| 112 (*max_platform_handles)++; | |
| 113 if (have_shared_memory) | |
| 114 (*max_platform_handles)++; | |
| 115 } | |
| 116 | |
| 117 void DataPipe::EndSerialize(const MojoCreateDataPipeOptions& options, | |
| 118 ScopedPlatformHandle channel_handle, | |
| 119 ScopedPlatformHandle shared_memory_handle, | |
| 120 size_t shared_memory_size, | |
| 121 void* destination, | |
| 122 size_t* actual_size, | |
| 123 PlatformHandleVector* platform_handles) { | |
| 124 SerializedDataPipeHandleDispatcher* serialization = | |
| 125 static_cast<SerializedDataPipeHandleDispatcher*>(destination); | |
| 126 if (channel_handle.is_valid()) { | |
| 127 DCHECK(platform_handles->size() < std::numeric_limits<uint32_t>::max()); | |
| 128 serialization->platform_handle_index = | |
| 129 static_cast<uint32_t>(platform_handles->size()); | |
| 130 platform_handles->push_back(channel_handle.release()); | |
| 131 } else { | |
| 132 serialization->platform_handle_index = kInvalidDataPipeHandleIndex; | |
| 133 } | |
| 134 | |
| 135 serialization->flags = options.flags; | |
| 136 serialization->element_num_bytes = options.element_num_bytes; | |
| 137 serialization->capacity_num_bytes = options.capacity_num_bytes; | |
| 138 | |
| 139 serialization->shared_memory_size = static_cast<uint32_t>(shared_memory_size); | |
| 140 if (serialization->shared_memory_size) { | |
| 141 DCHECK(platform_handles->size() < std::numeric_limits<uint32_t>::max()); | |
| 142 serialization->shared_memory_handle_index = | |
| 143 static_cast<uint32_t>(platform_handles->size()); | |
| 144 platform_handles->push_back(shared_memory_handle.release()); | |
| 145 } else { | |
| 146 serialization->shared_memory_handle_index = kInvalidDataPipeHandleIndex; | |
| 147 } | |
| 148 | |
| 149 *actual_size = sizeof(SerializedDataPipeHandleDispatcher); | |
| 150 } | |
| 151 | |
| 152 ScopedPlatformHandle DataPipe::Deserialize( | |
| 153 const void* source, | |
| 154 size_t size, | |
| 155 PlatformHandleVector* platform_handles, | |
| 156 MojoCreateDataPipeOptions* options, | |
| 157 ScopedPlatformHandle* shared_memory_handle, | |
| 158 size_t* shared_memory_size) { | |
| 159 if (size != sizeof(SerializedDataPipeHandleDispatcher)) { | |
| 160 LOG(ERROR) << "Invalid serialized data pipe dispatcher (bad size)"; | |
| 161 return ScopedPlatformHandle(); | |
| 162 } | |
| 163 | |
| 164 const SerializedDataPipeHandleDispatcher* serialization = | |
| 165 static_cast<const SerializedDataPipeHandleDispatcher*>(source); | |
| 166 size_t platform_handle_index = serialization->platform_handle_index; | |
| 167 | |
| 168 // Starts off invalid, which is what we want. | |
| 169 PlatformHandle platform_handle; | |
| 170 if (platform_handle_index != kInvalidDataPipeHandleIndex) { | |
| 171 if (!platform_handles || | |
| 172 platform_handle_index >= platform_handles->size()) { | |
| 173 LOG(ERROR) | |
| 174 << "Invalid serialized data pipe dispatcher (missing handles)"; | |
| 175 return ScopedPlatformHandle(); | |
| 176 } | |
| 177 | |
| 178 // We take ownership of the handle, so we have to invalidate the one in | |
| 179 // |platform_handles|. | |
| 180 std::swap(platform_handle, (*platform_handles)[platform_handle_index]); | |
| 181 } | |
| 182 | |
| 183 options->struct_size = sizeof(MojoCreateDataPipeOptions); | |
| 184 options->flags = serialization->flags; | |
| 185 options->element_num_bytes = serialization->element_num_bytes; | |
| 186 options->capacity_num_bytes = serialization->capacity_num_bytes; | |
| 187 | |
| 188 if (shared_memory_size) { | |
| 189 *shared_memory_size = serialization->shared_memory_size; | |
| 190 if (*shared_memory_size) { | |
| 191 DCHECK(serialization->shared_memory_handle_index != | |
| 192 kInvalidDataPipeHandleIndex); | |
| 193 if (!platform_handles || | |
| 194 serialization->shared_memory_handle_index >= | |
| 195 platform_handles->size()) { | |
| 196 LOG(ERROR) << "Invalid serialized data pipe dispatcher " | |
| 197 << "(missing handles)"; | |
| 198 return ScopedPlatformHandle(); | |
| 199 } | |
| 200 | |
| 201 PlatformHandle temp_shared_memory_handle; | |
| 202 std::swap(temp_shared_memory_handle, | |
| 203 (*platform_handles)[serialization->shared_memory_handle_index]); | |
| 204 *shared_memory_handle = | |
| 205 ScopedPlatformHandle(temp_shared_memory_handle); | |
| 206 } | |
| 207 } | |
| 208 | |
| 209 size -= sizeof(SerializedDataPipeHandleDispatcher); | |
| 210 | |
| 211 return ScopedPlatformHandle(platform_handle); | |
| 212 } | |
| 213 | |
| 214 } // namespace edk | |
| 215 } // namespace mojo | |
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Chromium Code Reviews
Issue 1923063003:
[mojo-edk] Delete data_pipe.h/cc (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master