[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 1 | // Copyright 2013 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 "net/websockets/websocket_basic_stream.h" |
| 6 | |
| 7 | #include <algorithm> |
| 8 | #include <limits> |
| 9 | #include <string> |
| 10 | #include <vector> |
| 11 | |
| 12 | #include "base/basictypes.h" |
| 13 | #include "base/bind.h" |
| 14 | #include "base/logging.h" |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 15 | #include "base/safe_numerics.h" |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 16 | #include "net/base/io_buffer.h" |
| 17 | #include "net/base/net_errors.h" |
| 18 | #include "net/socket/client_socket_handle.h" |
| 19 | #include "net/websockets/websocket_errors.h" |
| 20 | #include "net/websockets/websocket_frame.h" |
| 21 | #include "net/websockets/websocket_frame_parser.h" |
| 22 | |
| 23 | namespace net { |
| 24 | |
| 25 | namespace { |
| 26 | |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 27 | // This uses type uint64 to match the definition of |
| 28 | // WebSocketFrameHeader::payload_length in websocket_frame.h. |
| 29 | const uint64 kMaxControlFramePayload = 125; |
| 30 | |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 31 | // The number of bytes to attempt to read at a time. |
| 32 | // TODO(ricea): See if there is a better number or algorithm to fulfill our |
| 33 | // requirements: |
| 34 | // 1. We would like to use minimal memory on low-bandwidth or idle connections |
| 35 | // 2. We would like to read as close to line speed as possible on |
| 36 | // high-bandwidth connections |
| 37 | // 3. We can't afford to cause jank on the IO thread by copying large buffers |
| 38 | // around |
| 39 | // 4. We would like to hit any sweet-spots that might exist in terms of network |
| 40 | // packet sizes / encryption block sizes / IPC alignment issues, etc. |
| 41 | const int kReadBufferSize = 32 * 1024; |
| 42 | |
[email protected] | 9576544a | 2013-10-11 08:36:33 | [diff] [blame] | 43 | typedef ScopedVector<WebSocketFrame>::const_iterator WebSocketFrameIterator; |
| 44 | |
| 45 | // Returns the total serialized size of |frames|. This function assumes that |
| 46 | // |frames| will be serialized with mask field. This function forces the |
| 47 | // masked bit of the frames on. |
| 48 | int CalculateSerializedSizeAndTurnOnMaskBit( |
| 49 | ScopedVector<WebSocketFrame>* frames) { |
| 50 | const int kMaximumTotalSize = std::numeric_limits<int>::max(); |
| 51 | |
| 52 | int total_size = 0; |
| 53 | for (WebSocketFrameIterator it = frames->begin(); |
| 54 | it != frames->end(); ++it) { |
| 55 | WebSocketFrame* frame = *it; |
| 56 | // Force the masked bit on. |
| 57 | frame->header.masked = true; |
| 58 | // We enforce flow control so the renderer should never be able to force us |
| 59 | // to cache anywhere near 2GB of frames. |
| 60 | int frame_size = frame->header.payload_length + |
| 61 | GetWebSocketFrameHeaderSize(frame->header); |
| 62 | CHECK_GE(kMaximumTotalSize - total_size, frame_size) |
| 63 | << "Aborting to prevent overflow"; |
| 64 | total_size += frame_size; |
| 65 | } |
| 66 | return total_size; |
| 67 | } |
| 68 | |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 69 | } // namespace |
| 70 | |
| 71 | WebSocketBasicStream::WebSocketBasicStream( |
| 72 | scoped_ptr<ClientSocketHandle> connection) |
| 73 | : read_buffer_(new IOBufferWithSize(kReadBufferSize)), |
| 74 | connection_(connection.Pass()), |
| 75 | generate_websocket_masking_key_(&GenerateWebSocketMaskingKey) { |
| 76 | DCHECK(connection_->is_initialized()); |
| 77 | } |
| 78 | |
| 79 | WebSocketBasicStream::~WebSocketBasicStream() { Close(); } |
| 80 | |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 81 | int WebSocketBasicStream::ReadFrames(ScopedVector<WebSocketFrame>* frames, |
| 82 | const CompletionCallback& callback) { |
| 83 | DCHECK(frames->empty()); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 84 | // If there is data left over after parsing the HTTP headers, attempt to parse |
| 85 | // it as WebSocket frames. |
| 86 | if (http_read_buffer_) { |
| 87 | DCHECK_GE(http_read_buffer_->offset(), 0); |
| 88 | // We cannot simply copy the data into read_buffer_, as it might be too |
| 89 | // large. |
| 90 | scoped_refptr<GrowableIOBuffer> buffered_data; |
| 91 | buffered_data.swap(http_read_buffer_); |
| 92 | DCHECK(http_read_buffer_.get() == NULL); |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 93 | ScopedVector<WebSocketFrameChunk> frame_chunks; |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 94 | if (!parser_.Decode(buffered_data->StartOfBuffer(), |
| 95 | buffered_data->offset(), |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 96 | &frame_chunks)) |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 97 | return WebSocketErrorToNetError(parser_.websocket_error()); |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 98 | if (!frame_chunks.empty()) { |
| 99 | int result = ConvertChunksToFrames(&frame_chunks, frames); |
| 100 | if (result != ERR_IO_PENDING) |
| 101 | return result; |
| 102 | } |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 103 | } |
| 104 | |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 105 | // Run until socket stops giving us data or we get some frames. |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 106 | while (true) { |
| 107 | // base::Unretained(this) here is safe because net::Socket guarantees not to |
| 108 | // call any callbacks after Disconnect(), which we call from the |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 109 | // destructor. The caller of ReadFrames() is required to keep |frames| |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 110 | // valid. |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 111 | int result = connection_->socket()->Read( |
| 112 | read_buffer_.get(), |
| 113 | read_buffer_->size(), |
| 114 | base::Bind(&WebSocketBasicStream::OnReadComplete, |
| 115 | base::Unretained(this), |
| 116 | base::Unretained(frames), |
| 117 | callback)); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 118 | if (result == ERR_IO_PENDING) |
| 119 | return result; |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 120 | result = HandleReadResult(result, frames); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 121 | if (result != ERR_IO_PENDING) |
| 122 | return result; |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 123 | DCHECK(frames->empty()); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 124 | } |
| 125 | } |
| 126 | |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 127 | int WebSocketBasicStream::WriteFrames(ScopedVector<WebSocketFrame>* frames, |
| 128 | const CompletionCallback& callback) { |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 129 | // This function always concatenates all frames into a single buffer. |
| 130 | // TODO(ricea): Investigate whether it would be better in some cases to |
| 131 | // perform multiple writes with smaller buffers. |
| 132 | // |
| 133 | // First calculate the size of the buffer we need to allocate. |
[email protected] | 9576544a | 2013-10-11 08:36:33 | [diff] [blame] | 134 | int total_size = CalculateSerializedSizeAndTurnOnMaskBit(frames); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 135 | scoped_refptr<IOBufferWithSize> combined_buffer( |
| 136 | new IOBufferWithSize(total_size)); |
[email protected] | 9576544a | 2013-10-11 08:36:33 | [diff] [blame] | 137 | |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 138 | char* dest = combined_buffer->data(); |
| 139 | int remaining_size = total_size; |
[email protected] | 9576544a | 2013-10-11 08:36:33 | [diff] [blame] | 140 | for (WebSocketFrameIterator it = frames->begin(); |
| 141 | it != frames->end(); ++it) { |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 142 | WebSocketFrame* frame = *it; |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 143 | WebSocketMaskingKey mask = generate_websocket_masking_key_(); |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 144 | int result = |
| 145 | WriteWebSocketFrameHeader(frame->header, &mask, dest, remaining_size); |
| 146 | DCHECK_NE(ERR_INVALID_ARGUMENT, result) |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 147 | << "WriteWebSocketFrameHeader() says that " << remaining_size |
| 148 | << " is not enough to write the header in. This should not happen."; |
| 149 | CHECK_GE(result, 0) << "Potentially security-critical check failed"; |
| 150 | dest += result; |
| 151 | remaining_size -= result; |
| 152 | |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 153 | const char* const frame_data = frame->data->data(); |
| 154 | const int frame_size = frame->header.payload_length; |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 155 | CHECK_GE(remaining_size, frame_size); |
| 156 | std::copy(frame_data, frame_data + frame_size, dest); |
| 157 | MaskWebSocketFramePayload(mask, 0, dest, frame_size); |
| 158 | dest += frame_size; |
| 159 | remaining_size -= frame_size; |
| 160 | } |
| 161 | DCHECK_EQ(0, remaining_size) << "Buffer size calculation was wrong; " |
| 162 | << remaining_size << " bytes left over."; |
| 163 | scoped_refptr<DrainableIOBuffer> drainable_buffer( |
| 164 | new DrainableIOBuffer(combined_buffer, total_size)); |
| 165 | return WriteEverything(drainable_buffer, callback); |
| 166 | } |
| 167 | |
| 168 | void WebSocketBasicStream::Close() { connection_->socket()->Disconnect(); } |
| 169 | |
| 170 | std::string WebSocketBasicStream::GetSubProtocol() const { |
| 171 | return sub_protocol_; |
| 172 | } |
| 173 | |
| 174 | std::string WebSocketBasicStream::GetExtensions() const { return extensions_; } |
| 175 | |
| 176 | int WebSocketBasicStream::SendHandshakeRequest( |
| 177 | const GURL& url, |
| 178 | const HttpRequestHeaders& headers, |
| 179 | HttpResponseInfo* response_info, |
| 180 | const CompletionCallback& callback) { |
| 181 | // TODO(ricea): Implement handshake-related functionality. |
| 182 | NOTREACHED(); |
| 183 | return ERR_NOT_IMPLEMENTED; |
| 184 | } |
| 185 | |
| 186 | int WebSocketBasicStream::ReadHandshakeResponse( |
| 187 | const CompletionCallback& callback) { |
| 188 | NOTREACHED(); |
| 189 | return ERR_NOT_IMPLEMENTED; |
| 190 | } |
| 191 | |
| 192 | /*static*/ |
| 193 | scoped_ptr<WebSocketBasicStream> |
| 194 | WebSocketBasicStream::CreateWebSocketBasicStreamForTesting( |
| 195 | scoped_ptr<ClientSocketHandle> connection, |
| 196 | const scoped_refptr<GrowableIOBuffer>& http_read_buffer, |
| 197 | const std::string& sub_protocol, |
| 198 | const std::string& extensions, |
| 199 | WebSocketMaskingKeyGeneratorFunction key_generator_function) { |
| 200 | scoped_ptr<WebSocketBasicStream> stream( |
| 201 | new WebSocketBasicStream(connection.Pass())); |
| 202 | if (http_read_buffer) { |
| 203 | stream->http_read_buffer_ = http_read_buffer; |
| 204 | } |
| 205 | stream->sub_protocol_ = sub_protocol; |
| 206 | stream->extensions_ = extensions; |
| 207 | stream->generate_websocket_masking_key_ = key_generator_function; |
| 208 | return stream.Pass(); |
| 209 | } |
| 210 | |
| 211 | int WebSocketBasicStream::WriteEverything( |
| 212 | const scoped_refptr<DrainableIOBuffer>& buffer, |
| 213 | const CompletionCallback& callback) { |
| 214 | while (buffer->BytesRemaining() > 0) { |
| 215 | // The use of base::Unretained() here is safe because on destruction we |
| 216 | // disconnect the socket, preventing any further callbacks. |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 217 | int result = connection_->socket()->Write( |
| 218 | buffer.get(), |
| 219 | buffer->BytesRemaining(), |
| 220 | base::Bind(&WebSocketBasicStream::OnWriteComplete, |
| 221 | base::Unretained(this), |
| 222 | buffer, |
| 223 | callback)); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 224 | if (result > 0) { |
| 225 | buffer->DidConsume(result); |
| 226 | } else { |
| 227 | return result; |
| 228 | } |
| 229 | } |
| 230 | return OK; |
| 231 | } |
| 232 | |
| 233 | void WebSocketBasicStream::OnWriteComplete( |
| 234 | const scoped_refptr<DrainableIOBuffer>& buffer, |
| 235 | const CompletionCallback& callback, |
| 236 | int result) { |
| 237 | if (result < 0) { |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 238 | DCHECK_NE(ERR_IO_PENDING, result); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 239 | callback.Run(result); |
| 240 | return; |
| 241 | } |
| 242 | |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 243 | DCHECK_NE(0, result); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 244 | buffer->DidConsume(result); |
| 245 | result = WriteEverything(buffer, callback); |
| 246 | if (result != ERR_IO_PENDING) |
| 247 | callback.Run(result); |
| 248 | } |
| 249 | |
| 250 | int WebSocketBasicStream::HandleReadResult( |
| 251 | int result, |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 252 | ScopedVector<WebSocketFrame>* frames) { |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 253 | DCHECK_NE(ERR_IO_PENDING, result); |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 254 | DCHECK(frames->empty()); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 255 | if (result < 0) |
| 256 | return result; |
| 257 | if (result == 0) |
| 258 | return ERR_CONNECTION_CLOSED; |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 259 | ScopedVector<WebSocketFrameChunk> frame_chunks; |
| 260 | if (!parser_.Decode(read_buffer_->data(), result, &frame_chunks)) |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 261 | return WebSocketErrorToNetError(parser_.websocket_error()); |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 262 | if (frame_chunks.empty()) |
| 263 | return ERR_IO_PENDING; |
| 264 | return ConvertChunksToFrames(&frame_chunks, frames); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 265 | } |
| 266 | |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 267 | int WebSocketBasicStream::ConvertChunksToFrames( |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 268 | ScopedVector<WebSocketFrameChunk>* frame_chunks, |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 269 | ScopedVector<WebSocketFrame>* frames) { |
| 270 | for (size_t i = 0; i < frame_chunks->size(); ++i) { |
| 271 | scoped_ptr<WebSocketFrame> frame; |
| 272 | int result = ConvertChunkToFrame( |
| 273 | scoped_ptr<WebSocketFrameChunk>((*frame_chunks)[i]), &frame); |
| 274 | (*frame_chunks)[i] = NULL; |
| 275 | if (result != OK) |
| 276 | return result; |
| 277 | if (frame) |
| 278 | frames->push_back(frame.release()); |
| 279 | } |
| 280 | // All the elements of |frame_chunks| are now NULL, so there is no point in |
| 281 | // calling delete on them all. |
| 282 | frame_chunks->weak_clear(); |
| 283 | if (frames->empty()) |
| 284 | return ERR_IO_PENDING; |
| 285 | return OK; |
| 286 | } |
| 287 | |
| 288 | int WebSocketBasicStream::ConvertChunkToFrame( |
| 289 | scoped_ptr<WebSocketFrameChunk> chunk, |
| 290 | scoped_ptr<WebSocketFrame>* frame) { |
| 291 | DCHECK(frame->get() == NULL); |
| 292 | bool is_first_chunk = false; |
| 293 | if (chunk->header) { |
| 294 | DCHECK(current_frame_header_ == NULL) |
| 295 | << "Received the header for a new frame without notification that " |
| 296 | << "the previous frame was complete (bug in WebSocketFrameParser?)"; |
| 297 | is_first_chunk = true; |
| 298 | current_frame_header_.swap(chunk->header); |
| 299 | } |
| 300 | const int chunk_size = chunk->data ? chunk->data->size() : 0; |
| 301 | DCHECK(current_frame_header_) << "Unexpected header-less chunk received " |
| 302 | << "(final_chunk = " << chunk->final_chunk |
| 303 | << ", data size = " << chunk_size |
| 304 | << ") (bug in WebSocketFrameParser?)"; |
| 305 | scoped_refptr<IOBufferWithSize> data_buffer; |
| 306 | data_buffer.swap(chunk->data); |
| 307 | const bool is_final_chunk = chunk->final_chunk; |
| 308 | const WebSocketFrameHeader::OpCode opcode = current_frame_header_->opcode; |
| 309 | if (WebSocketFrameHeader::IsKnownControlOpCode(opcode)) { |
| 310 | bool protocol_error = false; |
| 311 | if (!current_frame_header_->final) { |
| 312 | DVLOG(1) << "WebSocket protocol error. Control frame, opcode=" << opcode |
| 313 | << " received with FIN bit unset."; |
| 314 | protocol_error = true; |
| 315 | } |
| 316 | if (current_frame_header_->payload_length > kMaxControlFramePayload) { |
| 317 | DVLOG(1) << "WebSocket protocol error. Control frame, opcode=" << opcode |
| 318 | << ", payload_length=" << current_frame_header_->payload_length |
| 319 | << " exceeds maximum payload length for a control message."; |
| 320 | protocol_error = true; |
| 321 | } |
| 322 | if (protocol_error) { |
| 323 | current_frame_header_.reset(); |
| 324 | return ERR_WS_PROTOCOL_ERROR; |
| 325 | } |
| 326 | if (!is_final_chunk) { |
| 327 | DVLOG(2) << "Encountered a split control frame, opcode " << opcode; |
| 328 | if (incomplete_control_frame_body_) { |
| 329 | DVLOG(3) << "Appending to an existing split control frame."; |
| 330 | AddToIncompleteControlFrameBody(data_buffer); |
| 331 | } else { |
| 332 | DVLOG(3) << "Creating new storage for an incomplete control frame."; |
| 333 | incomplete_control_frame_body_ = new GrowableIOBuffer(); |
| 334 | // This method checks for oversize control frames above, so as long as |
| 335 | // the frame parser is working correctly, this won't overflow. If a bug |
| 336 | // does cause it to overflow, it will CHECK() in |
| 337 | // AddToIncompleteControlFrameBody() without writing outside the buffer. |
| 338 | incomplete_control_frame_body_->SetCapacity(kMaxControlFramePayload); |
| 339 | AddToIncompleteControlFrameBody(data_buffer); |
| 340 | } |
| 341 | return OK; |
| 342 | } |
| 343 | if (incomplete_control_frame_body_) { |
| 344 | DVLOG(2) << "Rejoining a split control frame, opcode " << opcode; |
| 345 | AddToIncompleteControlFrameBody(data_buffer); |
| 346 | const int body_size = incomplete_control_frame_body_->offset(); |
| 347 | DCHECK_EQ(body_size, |
| 348 | static_cast<int>(current_frame_header_->payload_length)); |
| 349 | scoped_refptr<IOBufferWithSize> body = new IOBufferWithSize(body_size); |
| 350 | memcpy(body->data(), |
| 351 | incomplete_control_frame_body_->StartOfBuffer(), |
| 352 | body_size); |
| 353 | incomplete_control_frame_body_ = NULL; // Frame now complete. |
| 354 | DCHECK(is_final_chunk); |
| 355 | *frame = CreateFrame(is_final_chunk, body); |
| 356 | return OK; |
| 357 | } |
| 358 | } |
| 359 | |
| 360 | // Apply basic sanity checks to the |payload_length| field from the frame |
| 361 | // header. A check for exact equality can only be used when the whole frame |
| 362 | // arrives in one chunk. |
| 363 | DCHECK_GE(current_frame_header_->payload_length, |
| 364 | base::checked_numeric_cast<uint64>(chunk_size)); |
| 365 | DCHECK(!is_first_chunk || !is_final_chunk || |
| 366 | current_frame_header_->payload_length == |
| 367 | base::checked_numeric_cast<uint64>(chunk_size)); |
| 368 | |
| 369 | // Convert the chunk to a complete frame. |
| 370 | *frame = CreateFrame(is_final_chunk, data_buffer); |
| 371 | return OK; |
| 372 | } |
| 373 | |
| 374 | scoped_ptr<WebSocketFrame> WebSocketBasicStream::CreateFrame( |
| 375 | bool is_final_chunk, |
| 376 | const scoped_refptr<IOBufferWithSize>& data) { |
| 377 | scoped_ptr<WebSocketFrame> result_frame; |
| 378 | const bool is_final_chunk_in_message = |
| 379 | is_final_chunk && current_frame_header_->final; |
| 380 | const int data_size = data ? data->size() : 0; |
| 381 | const WebSocketFrameHeader::OpCode opcode = current_frame_header_->opcode; |
[email protected] | e678d4fe | 2013-10-11 11:27:55 | [diff] [blame^] | 382 | // Empty frames convey no useful information unless they are the first frame |
| 383 | // (containing the type and flags) or have the "final" bit set. |
| 384 | if (is_final_chunk_in_message || data_size > 0 || |
| 385 | current_frame_header_->opcode != |
| 386 | WebSocketFrameHeader::kOpCodeContinuation) { |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 387 | result_frame.reset(new WebSocketFrame(opcode)); |
| 388 | result_frame->header.CopyFrom(*current_frame_header_); |
| 389 | result_frame->header.final = is_final_chunk_in_message; |
| 390 | result_frame->header.payload_length = data_size; |
| 391 | result_frame->data = data; |
| 392 | // Ensure that opcodes Text and Binary are only used for the first frame in |
| 393 | // the message. |
| 394 | if (WebSocketFrameHeader::IsKnownDataOpCode(opcode)) |
| 395 | current_frame_header_->opcode = WebSocketFrameHeader::kOpCodeContinuation; |
| 396 | } |
| 397 | // Make sure that a frame header is not applied to any chunks that do not |
| 398 | // belong to it. |
| 399 | if (is_final_chunk) |
| 400 | current_frame_header_.reset(); |
| 401 | return result_frame.Pass(); |
| 402 | } |
| 403 | |
| 404 | void WebSocketBasicStream::AddToIncompleteControlFrameBody( |
| 405 | const scoped_refptr<IOBufferWithSize>& data_buffer) { |
| 406 | if (!data_buffer) |
| 407 | return; |
| 408 | const int new_offset = |
| 409 | incomplete_control_frame_body_->offset() + data_buffer->size(); |
| 410 | CHECK_GE(incomplete_control_frame_body_->capacity(), new_offset) |
| 411 | << "Control frame body larger than frame header indicates; frame parser " |
| 412 | "bug?"; |
| 413 | memcpy(incomplete_control_frame_body_->data(), |
| 414 | data_buffer->data(), |
| 415 | data_buffer->size()); |
| 416 | incomplete_control_frame_body_->set_offset(new_offset); |
| 417 | } |
| 418 | |
| 419 | void WebSocketBasicStream::OnReadComplete(ScopedVector<WebSocketFrame>* frames, |
| 420 | const CompletionCallback& callback, |
| 421 | int result) { |
| 422 | result = HandleReadResult(result, frames); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 423 | if (result == ERR_IO_PENDING) |
[email protected] | 2f5d9f6 | 2013-09-26 12:14:28 | [diff] [blame] | 424 | result = ReadFrames(frames, callback); |
[email protected] | adb225d | 2013-08-30 13:14:43 | [diff] [blame] | 425 | if (result != ERR_IO_PENDING) |
| 426 | callback.Run(result); |
| 427 | } |
| 428 | |
| 429 | } // namespace net |