mirror of
https://github.com/klzgrad/naiveproxy.git
synced 2024-11-24 22:36:09 +03:00
96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
// 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/hpack/decoder/hpack_varint_decoder.h"
|
|
|
|
#include "net/http2/platform/api/http2_string_utils.h"
|
|
|
|
namespace net {
|
|
|
|
DecodeStatus HpackVarintDecoder::Start(uint8_t prefix_value,
|
|
uint8_t prefix_mask,
|
|
DecodeBuffer* db) {
|
|
DCHECK_LE(15, prefix_mask) << std::hex << prefix_mask;
|
|
DCHECK_LE(prefix_mask, 127) << std::hex << prefix_mask;
|
|
// Confirm that |prefix_mask| is a contiguous sequence of bits.
|
|
DCHECK_EQ(0, (prefix_mask + 1) & prefix_mask) << std::hex << prefix_mask;
|
|
|
|
// Ignore the bits that aren't a part of the prefix of the varint.
|
|
value_ = prefix_value & prefix_mask;
|
|
|
|
if (value_ < prefix_mask) {
|
|
MarkDone();
|
|
return DecodeStatus::kDecodeDone;
|
|
}
|
|
|
|
offset_ = 0;
|
|
return Resume(db);
|
|
}
|
|
|
|
DecodeStatus HpackVarintDecoder::StartExtended(uint8_t prefix_mask,
|
|
DecodeBuffer* db) {
|
|
DCHECK_LE(15, prefix_mask) << std::hex << prefix_mask;
|
|
DCHECK_LE(prefix_mask, 127) << std::hex << prefix_mask;
|
|
// Confirm that |prefix_mask| is a contiguous sequence of bits.
|
|
DCHECK_EQ(0, prefix_mask & (prefix_mask + 1)) << std::hex << prefix_mask;
|
|
|
|
value_ = prefix_mask;
|
|
offset_ = 0;
|
|
return Resume(db);
|
|
}
|
|
|
|
DecodeStatus HpackVarintDecoder::Resume(DecodeBuffer* db) {
|
|
CheckNotDone();
|
|
do {
|
|
if (db->Empty()) {
|
|
return DecodeStatus::kDecodeInProgress;
|
|
}
|
|
uint8_t byte = db->DecodeUInt8();
|
|
if (offset_ == MaxOffset() && byte != 0)
|
|
break;
|
|
value_ += (byte & 0x7f) << offset_;
|
|
if ((byte & 0x80) == 0) {
|
|
MarkDone();
|
|
return DecodeStatus::kDecodeDone;
|
|
}
|
|
offset_ += 7;
|
|
} while (offset_ <= MaxOffset());
|
|
DLOG(WARNING) << "Variable length int encoding is too large or too long. "
|
|
<< DebugString();
|
|
MarkDone();
|
|
return DecodeStatus::kDecodeError;
|
|
}
|
|
|
|
uint32_t HpackVarintDecoder::value() const {
|
|
CheckDone();
|
|
return value_;
|
|
}
|
|
|
|
void HpackVarintDecoder::set_value(uint32_t v) {
|
|
MarkDone();
|
|
value_ = v;
|
|
}
|
|
|
|
Http2String HpackVarintDecoder::DebugString() const {
|
|
return Http2StrCat("HpackVarintDecoder(value=", value_, ", offset=", offset_,
|
|
")");
|
|
}
|
|
|
|
DecodeStatus HpackVarintDecoder::StartForTest(uint8_t prefix_value,
|
|
uint8_t prefix_mask,
|
|
DecodeBuffer* db) {
|
|
return Start(prefix_value, prefix_mask, db);
|
|
}
|
|
|
|
DecodeStatus HpackVarintDecoder::StartExtendedForTest(uint8_t prefix_mask,
|
|
DecodeBuffer* db) {
|
|
return StartExtended(prefix_mask, db);
|
|
}
|
|
|
|
DecodeStatus HpackVarintDecoder::ResumeForTest(DecodeBuffer* db) {
|
|
return Resume(db);
|
|
}
|
|
|
|
} // namespace net
|