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// Copyright (c) 2012 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.
// Some helpers for quic.
#include "net/base/int128.h"
#include "net/base/net_export.h"
#include "net/quic/quic_protocol.h"
namespace net {
class NET_EXPORT_PRIVATE QuicUtils {
enum Priority {
// Returns the 64 bit FNV1a hash of the data. See
static uint64 FNV1a_64_Hash(const char* data, int len);
// returns the 128 bit FNV1a hash of the data. See
static uint128 FNV1a_128_Hash(const char* data, int len);
// FindMutualTag sets |out_result| to the first tag in the priority list that
// is also in the other list and returns true. If there is no intersection it
// returns false.
// Which list has priority is determined by |priority|.
// If |out_index| is non-NULL and a match is found then the index of that
// match in |their_tags| is written to |out_index|.
static bool FindMutualTag(const QuicTagVector& our_tags,
const QuicTag* their_tags,
size_t num_their_tags,
Priority priority,
QuicTag* out_result,
size_t* out_index);
// SerializeUint128 writes |v| in little-endian form to |out|.
static void SerializeUint128(uint128 v, uint8* out);
// SerializeUint128 writes the first 96 bits of |v| in little-endian form
// to |out|.
static void SerializeUint128Short(uint128 v, uint8* out);
// Returns the name of the QuicRstStreamErrorCode as a char*
static const char* StreamErrorToString(QuicRstStreamErrorCode error);
// Returns the name of the QuicErrorCode as a char*
static const char* ErrorToString(QuicErrorCode error);
// Returns the level of encryption as a char*
static const char* EncryptionLevelToString(EncryptionLevel level);
// Returns TransmissionType as a char*
static const char* TransmissionTypeToString(TransmissionType type);
// TagToString is a utility function for pretty-printing handshake messages
// that converts a tag to a string. It will try to maintain the human friendly
// name if possible (i.e. kABCD -> "ABCD"), or will just treat it as a number
// if not.
static std::string TagToString(QuicTag tag);
// Given a binary buffer, return a hex+ASCII dump in the style of
// tcpdump's -X and -XX options:
// "0x0000: 0090 69bd 5400 000d 610f 0189 0800 4500 ..i.T...a.....E.\n"
// "0x0010: 001c fb98 4000 4001 7e18 d8ef 2301 455d ....@.@.~...#.E]\n"
// "0x0020: 7fe2 0800 6bcb 0bc6 806e ....k....n\n"
static std::string StringToHexASCIIDump(base::StringPiece in_buffer);
static char* AsChars(unsigned char* data) {
return reinterpret_cast<char*>(data);
static QuicPriority LowestPriority();
static QuicPriority HighestPriority();
// Utility function that returns an IOVector object wrapped around |str|.
inline IOVector MakeIOVector(base::StringPiece str) {
IOVector iov;
iov.Append(const_cast<char*>(, str.size());
return iov;
} // namespace net