Project import generated by Copybara.
PiperOrigin-RevId: 224614037
Change-Id: I14e53449d4aeccb328f86828c76b5f09dea0d4b8
diff --git a/http2/decoder/payload_decoders/altsvc_payload_decoder.cc b/http2/decoder/payload_decoders/altsvc_payload_decoder.cc
new file mode 100644
index 0000000..4e4d860
--- /dev/null
+++ b/http2/decoder/payload_decoders/altsvc_payload_decoder.cc
@@ -0,0 +1,148 @@
+// 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/third_party/quiche/src/http2/decoder/payload_decoders/altsvc_payload_decoder.h"
+
+#include <stddef.h>
+
+#include "base/logging.h"
+#include "base/macros.h"
+#include "net/third_party/quiche/src/http2/decoder/decode_buffer.h"
+#include "net/third_party/quiche/src/http2/decoder/http2_frame_decoder_listener.h"
+#include "net/third_party/quiche/src/http2/http2_constants.h"
+#include "net/third_party/quiche/src/http2/http2_structures.h"
+#include "net/third_party/quiche/src/http2/platform/api/http2_bug_tracker.h"
+#include "net/third_party/quiche/src/http2/platform/api/http2_macros.h"
+
+namespace http2 {
+
+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";
+ }
+ // Since the value doesn't come over the wire, only a programming bug should
+ // result in reaching this point.
+ int unknown = static_cast<int>(v);
+ HTTP2_BUG << "Invalid AltSvcPayloadDecoder::PayloadState: " << unknown;
+ return out << "AltSvcPayloadDecoder::PayloadState(" << unknown << ")";
+}
+
+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);
+ HTTP2_FALLTHROUGH;
+
+ 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();
+ }
+ HTTP2_FALLTHROUGH;
+
+ 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 http2
