mirror of
https://github.com/klzgrad/naiveproxy.git
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96 lines
2.8 KiB
C++
96 lines
2.8 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/http2/hpack/decoder/hpack_varint_decoder.h"
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#include "net/http2/platform/api/http2_string_utils.h"
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namespace net {
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DecodeStatus HpackVarintDecoder::Start(uint8_t prefix_value,
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uint8_t prefix_mask,
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DecodeBuffer* db) {
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DCHECK_LE(15, prefix_mask) << std::hex << prefix_mask;
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DCHECK_LE(prefix_mask, 127) << std::hex << prefix_mask;
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// Confirm that |prefix_mask| is a contiguous sequence of bits.
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DCHECK_EQ(0, (prefix_mask + 1) & prefix_mask) << std::hex << prefix_mask;
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// Ignore the bits that aren't a part of the prefix of the varint.
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value_ = prefix_value & prefix_mask;
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if (value_ < prefix_mask) {
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MarkDone();
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return DecodeStatus::kDecodeDone;
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}
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offset_ = 0;
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return Resume(db);
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}
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DecodeStatus HpackVarintDecoder::StartExtended(uint8_t prefix_mask,
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DecodeBuffer* db) {
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DCHECK_LE(15, prefix_mask) << std::hex << prefix_mask;
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DCHECK_LE(prefix_mask, 127) << std::hex << prefix_mask;
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// Confirm that |prefix_mask| is a contiguous sequence of bits.
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DCHECK_EQ(0, prefix_mask & (prefix_mask + 1)) << std::hex << prefix_mask;
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value_ = prefix_mask;
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offset_ = 0;
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return Resume(db);
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}
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DecodeStatus HpackVarintDecoder::Resume(DecodeBuffer* db) {
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CheckNotDone();
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do {
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if (db->Empty()) {
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return DecodeStatus::kDecodeInProgress;
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}
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uint8_t byte = db->DecodeUInt8();
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if (offset_ == MaxOffset() && byte != 0)
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break;
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value_ += (byte & 0x7f) << offset_;
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if ((byte & 0x80) == 0) {
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MarkDone();
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return DecodeStatus::kDecodeDone;
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}
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offset_ += 7;
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} while (offset_ <= MaxOffset());
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DLOG(WARNING) << "Variable length int encoding is too large or too long. "
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<< DebugString();
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MarkDone();
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return DecodeStatus::kDecodeError;
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}
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uint32_t HpackVarintDecoder::value() const {
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CheckDone();
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return value_;
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}
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void HpackVarintDecoder::set_value(uint32_t v) {
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MarkDone();
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value_ = v;
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}
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Http2String HpackVarintDecoder::DebugString() const {
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return Http2StrCat("HpackVarintDecoder(value=", value_, ", offset=", offset_,
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")");
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}
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DecodeStatus HpackVarintDecoder::StartForTest(uint8_t prefix_value,
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uint8_t prefix_mask,
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DecodeBuffer* db) {
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return Start(prefix_value, prefix_mask, db);
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}
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DecodeStatus HpackVarintDecoder::StartExtendedForTest(uint8_t prefix_mask,
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DecodeBuffer* db) {
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return StartExtended(prefix_mask, db);
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}
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DecodeStatus HpackVarintDecoder::ResumeForTest(DecodeBuffer* db) {
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return Resume(db);
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}
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} // namespace net
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