Index: net/http2/decoder/payload_decoders/data_payload_decoder.cc |
diff --git a/net/http2/decoder/payload_decoders/data_payload_decoder.cc b/net/http2/decoder/payload_decoders/data_payload_decoder.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..60b8a714f1996f31755c0c0db548e8aa1fe0c274 |
--- /dev/null |
+++ b/net/http2/decoder/payload_decoders/data_payload_decoder.cc |
@@ -0,0 +1,123 @@ |
+// Copyright 2016 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 "net/http2/decoder/payload_decoders/data_payload_decoder.h" |
+ |
+#include <stddef.h> |
+ |
+#include "base/logging.h" |
+#include "base/macros.h" |
+#include "net/http2/decoder/decode_buffer.h" |
+#include "net/http2/decoder/http2_frame_decoder_listener.h" |
+#include "net/http2/http2_constants.h" |
+#include "net/http2/http2_structures.h" |
+#include "net/http2/tools/http2_bug_tracker.h" |
+ |
+namespace net { |
+ |
+std::ostream& operator<<(std::ostream& out, |
+ DataPayloadDecoder::PayloadState v) { |
+ switch (v) { |
+ case DataPayloadDecoder::PayloadState::kReadPadLength: |
+ return out << "kReadPadLength"; |
+ case DataPayloadDecoder::PayloadState::kReadPayload: |
+ return out << "kReadPayload"; |
+ case DataPayloadDecoder::PayloadState::kSkipPadding: |
+ return out << "kSkipPadding"; |
+ } |
+ return out << static_cast<int>(v); |
+} |
+ |
+DecodeStatus DataPayloadDecoder::StartDecodingPayload(FrameDecoderState* state, |
+ DecodeBuffer* db) { |
+ const Http2FrameHeader& frame_header = state->frame_header(); |
+ const uint32_t total_length = frame_header.payload_length; |
+ |
+ DVLOG(2) << "DataPayloadDecoder::StartDecodingPayload: " << frame_header; |
+ DCHECK_EQ(Http2FrameType::DATA, frame_header.type); |
+ DCHECK_LE(db->Remaining(), total_length); |
+ DCHECK_EQ( |
+ 0, frame_header.flags & |
+ ~(Http2FrameFlag::FLAG_END_STREAM | Http2FrameFlag::FLAG_PADDED)); |
+ |
+ // Special case for the hoped for common case: unpadded and fits fully into |
+ // the decode buffer. TO BE SEEN if that is true. It certainly requires that |
+ // the transport buffers be large (e.g. >> 16KB typically). |
+ // TODO(jamessynge) Add counters. |
+ DVLOG(2) << "StartDecodingPayload total_length=" << total_length; |
+ if (!frame_header.IsPadded()) { |
+ DVLOG(2) << "StartDecodingPayload !IsPadded"; |
+ if (db->Remaining() == total_length) { |
+ DVLOG(2) << "StartDecodingPayload all present"; |
+ // Note that we don't cache the listener field so that the callee can |
+ // replace it if the frame is bad. |
+ // If this case is common enough, consider combining the 3 callbacks |
+ // into one. |
+ state->listener()->OnDataStart(frame_header); |
+ if (total_length > 0) { |
+ state->listener()->OnDataPayload(db->cursor(), total_length); |
+ db->AdvanceCursor(total_length); |
+ } |
+ state->listener()->OnDataEnd(); |
+ return DecodeStatus::kDecodeDone; |
+ } |
+ payload_state_ = PayloadState::kReadPayload; |
+ } else { |
+ payload_state_ = PayloadState::kReadPadLength; |
+ } |
+ state->InitializeRemainders(); |
+ state->listener()->OnDataStart(frame_header); |
+ return ResumeDecodingPayload(state, db); |
+} |
+ |
+DecodeStatus DataPayloadDecoder::ResumeDecodingPayload(FrameDecoderState* state, |
+ DecodeBuffer* db) { |
+ DVLOG(2) << "DataPayloadDecoder::ResumeDecodingPayload payload_state_=" |
+ << payload_state_; |
+ const Http2FrameHeader& frame_header = state->frame_header(); |
+ DCHECK_EQ(Http2FrameType::DATA, frame_header.type); |
+ DCHECK_LE(state->remaining_payload_and_padding(), |
+ frame_header.payload_length); |
+ DCHECK_LE(db->Remaining(), state->remaining_payload_and_padding()); |
+ DecodeStatus status; |
+ size_t avail; |
+ switch (payload_state_) { |
+ case PayloadState::kReadPadLength: |
+ // ReadPadLength handles the OnPadLength callback, and updating the |
+ // remaining_payload and remaining_padding fields. If the amount of |
+ // padding is too large to fit in the frame's payload, ReadPadLength |
+ // instead calls OnPaddingTooLong and returns kDecodeError. |
+ status = state->ReadPadLength(db, /*report_pad_length*/ true); |
+ if (status != DecodeStatus::kDecodeDone) { |
+ return status; |
+ } |
+ // FALLTHROUGH_INTENDED |
+ |
+ case PayloadState::kReadPayload: |
+ avail = state->AvailablePayload(db); |
+ if (avail > 0) { |
+ state->listener()->OnDataPayload(db->cursor(), avail); |
+ db->AdvanceCursor(avail); |
+ state->ConsumePayload(avail); |
+ } |
+ if (state->remaining_payload() > 0) { |
+ payload_state_ = PayloadState::kReadPayload; |
+ return DecodeStatus::kDecodeInProgress; |
+ } |
+ // FALLTHROUGH_INTENDED |
+ |
+ case PayloadState::kSkipPadding: |
+ // SkipPadding handles the OnPadding callback. |
+ if (state->SkipPadding(db)) { |
+ state->listener()->OnDataEnd(); |
+ return DecodeStatus::kDecodeDone; |
+ } |
+ payload_state_ = PayloadState::kSkipPadding; |
+ return DecodeStatus::kDecodeInProgress; |
+ } |
+ HTTP2_BUG << "PayloadState: " << payload_state_; |
+ return DecodeStatus::kDecodeError; |
+} |
+ |
+} // namespace net |