Project import generated by Copybara.
PiperOrigin-RevId: 224614037
Change-Id: I14e53449d4aeccb328f86828c76b5f09dea0d4b8
diff --git a/http2/decoder/frame_decoder_state.cc b/http2/decoder/frame_decoder_state.cc
new file mode 100644
index 0000000..946a6ee
--- /dev/null
+++ b/http2/decoder/frame_decoder_state.cc
@@ -0,0 +1,81 @@
+// 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/frame_decoder_state.h"
+
+namespace http2 {
+
+DecodeStatus FrameDecoderState::ReadPadLength(DecodeBuffer* db,
+ bool report_pad_length) {
+ DVLOG(2) << "ReadPadLength db->Remaining=" << db->Remaining()
+ << "; payload_length=" << frame_header().payload_length;
+ DCHECK(IsPaddable());
+ DCHECK(frame_header().IsPadded());
+
+ // Pad Length is always at the start of the frame, so remaining_payload_
+ // should equal payload_length at this point.
+ const uint32_t total_payload = frame_header().payload_length;
+ DCHECK_EQ(total_payload, remaining_payload_);
+ DCHECK_EQ(0u, remaining_padding_);
+
+ if (db->HasData()) {
+ const uint32_t pad_length = db->DecodeUInt8();
+ const uint32_t total_padding = pad_length + 1;
+ if (total_padding <= total_payload) {
+ remaining_padding_ = pad_length;
+ remaining_payload_ = total_payload - total_padding;
+ if (report_pad_length) {
+ listener()->OnPadLength(pad_length);
+ }
+ return DecodeStatus::kDecodeDone;
+ }
+ const uint32_t missing_length = total_padding - total_payload;
+ // To allow for the possibility of recovery, record the number of
+ // remaining bytes of the frame's payload (invalid though it is)
+ // in remaining_payload_.
+ remaining_payload_ = total_payload - 1; // 1 for sizeof(Pad Length).
+ remaining_padding_ = 0;
+ listener()->OnPaddingTooLong(frame_header(), missing_length);
+ return DecodeStatus::kDecodeError;
+ }
+
+ if (total_payload == 0) {
+ remaining_payload_ = 0;
+ remaining_padding_ = 0;
+ listener()->OnPaddingTooLong(frame_header(), 1);
+ return DecodeStatus::kDecodeError;
+ }
+ // Need to wait for another buffer.
+ return DecodeStatus::kDecodeInProgress;
+}
+
+bool FrameDecoderState::SkipPadding(DecodeBuffer* db) {
+ DVLOG(2) << "SkipPadding remaining_padding_=" << remaining_padding_
+ << ", db->Remaining=" << db->Remaining()
+ << ", header: " << frame_header();
+ DCHECK_EQ(remaining_payload_, 0u);
+ DCHECK(IsPaddable()) << "header: " << frame_header();
+ DCHECK_GE(remaining_padding_, 0u);
+ DCHECK(remaining_padding_ == 0 || frame_header().IsPadded())
+ << "remaining_padding_=" << remaining_padding_
+ << ", header: " << frame_header();
+ const size_t avail = AvailablePadding(db);
+ if (avail > 0) {
+ listener()->OnPadding(db->cursor(), avail);
+ db->AdvanceCursor(avail);
+ remaining_padding_ -= avail;
+ }
+ return remaining_padding_ == 0;
+}
+
+DecodeStatus FrameDecoderState::ReportFrameSizeError() {
+ DVLOG(2) << "FrameDecoderState::ReportFrameSizeError: "
+ << " remaining_payload_=" << remaining_payload_
+ << "; remaining_padding_=" << remaining_padding_
+ << ", header: " << frame_header();
+ listener()->OnFrameSizeError(frame_header());
+ return DecodeStatus::kDecodeError;
+}
+
+} // namespace http2
