Index: net/http2/decoder/payload_decoders/altsvc_payload_decoder.cc |
diff --git a/net/http2/decoder/payload_decoders/altsvc_payload_decoder.cc b/net/http2/decoder/payload_decoders/altsvc_payload_decoder.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..fe0e8c274aadc637b05aa923e646b28cc3462b24 |
--- /dev/null |
+++ b/net/http2/decoder/payload_decoders/altsvc_payload_decoder.cc |
@@ -0,0 +1,143 @@ |
+// 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/altsvc_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, |
+ AltSvcPayloadDecoder::PayloadState v) { |
+ switch (v) { |
+ case AltSvcPayloadDecoder::PayloadState::kStartDecodingStruct: |
+ return out << "kStartDecodingStruct"; |
+ case AltSvcPayloadDecoder::PayloadState::kMaybeDecodedStruct: |
+ return out << "kMaybeDecodedStruct"; |
+ case AltSvcPayloadDecoder::PayloadState::kDecodingStrings: |
+ return out << "kDecodingStrings"; |
+ case AltSvcPayloadDecoder::PayloadState::kResumeDecodingStruct: |
+ return out << "kResumeDecodingStruct"; |
+ } |
+ return out << static_cast<int>(v); |
+} |
+ |
+DecodeStatus AltSvcPayloadDecoder::StartDecodingPayload( |
+ FrameDecoderState* state, |
+ DecodeBuffer* db) { |
+ DVLOG(2) << "AltSvcPayloadDecoder::StartDecodingPayload: " |
+ << state->frame_header(); |
+ DCHECK_EQ(Http2FrameType::ALTSVC, state->frame_header().type); |
+ DCHECK_LE(db->Remaining(), state->frame_header().payload_length); |
+ DCHECK_EQ(0, state->frame_header().flags); |
+ |
+ state->InitializeRemainders(); |
+ payload_state_ = PayloadState::kStartDecodingStruct; |
+ |
+ return ResumeDecodingPayload(state, db); |
+} |
+ |
+DecodeStatus AltSvcPayloadDecoder::ResumeDecodingPayload( |
+ FrameDecoderState* state, |
+ DecodeBuffer* db) { |
+ const Http2FrameHeader& frame_header = state->frame_header(); |
+ DVLOG(2) << "AltSvcPayloadDecoder::ResumeDecodingPayload: " << frame_header; |
+ DCHECK_EQ(Http2FrameType::ALTSVC, frame_header.type); |
+ DCHECK_LE(state->remaining_payload(), frame_header.payload_length); |
+ DCHECK_LE(db->Remaining(), state->remaining_payload()); |
+ DCHECK_NE(PayloadState::kMaybeDecodedStruct, payload_state_); |
+ // |status| has to be initialized to some value to avoid compiler error in |
+ // case PayloadState::kMaybeDecodedStruct below, but value does not matter, |
+ // see DCHECK_NE above. |
+ DecodeStatus status = DecodeStatus::kDecodeError; |
+ while (true) { |
+ DVLOG(2) << "AltSvcPayloadDecoder::ResumeDecodingPayload payload_state_=" |
+ << payload_state_; |
+ switch (payload_state_) { |
+ case PayloadState::kStartDecodingStruct: |
+ status = state->StartDecodingStructureInPayload(&altsvc_fields_, db); |
+ // FALLTHROUGH_INTENDED |
+ |
+ case PayloadState::kMaybeDecodedStruct: |
+ if (status == DecodeStatus::kDecodeDone && |
+ altsvc_fields_.origin_length <= state->remaining_payload()) { |
+ size_t origin_length = altsvc_fields_.origin_length; |
+ size_t value_length = state->remaining_payload() - origin_length; |
+ state->listener()->OnAltSvcStart(frame_header, origin_length, |
+ value_length); |
+ } else if (status != DecodeStatus::kDecodeDone) { |
+ DCHECK(state->remaining_payload() > 0 || |
+ status == DecodeStatus::kDecodeError) |
+ << "\nremaining_payload: " << state->remaining_payload() |
+ << "\nstatus: " << status << "\nheader: " << frame_header; |
+ // Assume in progress. |
+ payload_state_ = PayloadState::kResumeDecodingStruct; |
+ return status; |
+ } else { |
+ // The origin's length is longer than the remaining payload. |
+ DCHECK_GT(altsvc_fields_.origin_length, state->remaining_payload()); |
+ return state->ReportFrameSizeError(); |
+ } |
+ // FALLTHROUGH_INTENDED |
+ |
+ case PayloadState::kDecodingStrings: |
+ return DecodeStrings(state, db); |
+ |
+ case PayloadState::kResumeDecodingStruct: |
+ status = state->ResumeDecodingStructureInPayload(&altsvc_fields_, db); |
+ payload_state_ = PayloadState::kMaybeDecodedStruct; |
+ continue; |
+ } |
+ HTTP2_BUG << "PayloadState: " << payload_state_; |
+ } |
+} |
+ |
+DecodeStatus AltSvcPayloadDecoder::DecodeStrings(FrameDecoderState* state, |
+ DecodeBuffer* db) { |
+ DVLOG(2) << "AltSvcPayloadDecoder::DecodeStrings remaining_payload=" |
+ << state->remaining_payload() |
+ << ", db->Remaining=" << db->Remaining(); |
+ // Note that we don't explicitly keep track of exactly how far through the |
+ // origin; instead we compute it from how much is left of the original |
+ // payload length and the decoded total length of the origin. |
+ size_t origin_length = altsvc_fields_.origin_length; |
+ size_t value_length = state->frame_header().payload_length - origin_length - |
+ Http2AltSvcFields::EncodedSize(); |
+ if (state->remaining_payload() > value_length) { |
+ size_t remaining_origin_length = state->remaining_payload() - value_length; |
+ size_t avail = db->MinLengthRemaining(remaining_origin_length); |
+ state->listener()->OnAltSvcOriginData(db->cursor(), avail); |
+ db->AdvanceCursor(avail); |
+ state->ConsumePayload(avail); |
+ if (remaining_origin_length > avail) { |
+ payload_state_ = PayloadState::kDecodingStrings; |
+ return DecodeStatus::kDecodeInProgress; |
+ } |
+ } |
+ // All that is left is the value string. |
+ DCHECK_LE(state->remaining_payload(), value_length); |
+ DCHECK_LE(db->Remaining(), state->remaining_payload()); |
+ if (db->HasData()) { |
+ size_t avail = db->Remaining(); |
+ state->listener()->OnAltSvcValueData(db->cursor(), avail); |
+ db->AdvanceCursor(avail); |
+ state->ConsumePayload(avail); |
+ } |
+ if (state->remaining_payload() == 0) { |
+ state->listener()->OnAltSvcEnd(); |
+ return DecodeStatus::kDecodeDone; |
+ } |
+ payload_state_ = PayloadState::kDecodingStrings; |
+ return DecodeStatus::kDecodeInProgress; |
+} |
+ |
+} // namespace net |