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82 lines
3.0 KiB
C++
82 lines
3.0 KiB
C++
// Copyright 2016 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "net/third_party/http2/decoder/frame_decoder_state.h"
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namespace http2 {
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DecodeStatus FrameDecoderState::ReadPadLength(DecodeBuffer* db,
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bool report_pad_length) {
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DVLOG(2) << "ReadPadLength db->Remaining=" << db->Remaining()
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<< "; payload_length=" << frame_header().payload_length;
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DCHECK(IsPaddable());
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DCHECK(frame_header().IsPadded());
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// Pad Length is always at the start of the frame, so remaining_payload_
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// should equal payload_length at this point.
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const uint32_t total_payload = frame_header().payload_length;
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DCHECK_EQ(total_payload, remaining_payload_);
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DCHECK_EQ(0u, remaining_padding_);
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if (db->HasData()) {
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const uint32_t pad_length = db->DecodeUInt8();
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const uint32_t total_padding = pad_length + 1;
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if (total_padding <= total_payload) {
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remaining_padding_ = pad_length;
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remaining_payload_ = total_payload - total_padding;
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if (report_pad_length) {
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listener()->OnPadLength(pad_length);
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}
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return DecodeStatus::kDecodeDone;
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}
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const uint32_t missing_length = total_padding - total_payload;
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// To allow for the possibility of recovery, record the number of
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// remaining bytes of the frame's payload (invalid though it is)
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// in remaining_payload_.
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remaining_payload_ = total_payload - 1; // 1 for sizeof(Pad Length).
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remaining_padding_ = 0;
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listener()->OnPaddingTooLong(frame_header(), missing_length);
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return DecodeStatus::kDecodeError;
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}
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if (total_payload == 0) {
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remaining_payload_ = 0;
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remaining_padding_ = 0;
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listener()->OnPaddingTooLong(frame_header(), 1);
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return DecodeStatus::kDecodeError;
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}
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// Need to wait for another buffer.
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return DecodeStatus::kDecodeInProgress;
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}
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bool FrameDecoderState::SkipPadding(DecodeBuffer* db) {
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DVLOG(2) << "SkipPadding remaining_padding_=" << remaining_padding_
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<< ", db->Remaining=" << db->Remaining()
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<< ", header: " << frame_header();
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DCHECK_EQ(remaining_payload_, 0u);
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DCHECK(IsPaddable()) << "header: " << frame_header();
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DCHECK_GE(remaining_padding_, 0u);
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DCHECK(remaining_padding_ == 0 || frame_header().IsPadded())
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<< "remaining_padding_=" << remaining_padding_
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<< ", header: " << frame_header();
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const size_t avail = AvailablePadding(db);
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if (avail > 0) {
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listener()->OnPadding(db->cursor(), avail);
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db->AdvanceCursor(avail);
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remaining_padding_ -= avail;
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}
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return remaining_padding_ == 0;
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}
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DecodeStatus FrameDecoderState::ReportFrameSizeError() {
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DVLOG(2) << "FrameDecoderState::ReportFrameSizeError: "
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<< " remaining_payload_=" << remaining_payload_
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<< "; remaining_padding_=" << remaining_padding_
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<< ", header: " << frame_header();
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listener()->OnFrameSizeError(frame_header());
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return DecodeStatus::kDecodeError;
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}
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} // namespace http2
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