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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.
#ifndef QUICHE_QUIC_CORE_QUIC_UTILS_H_
#define QUICHE_QUIC_CORE_QUIC_UTILS_H_
#include <cstddef>
#include <cstdint>
#include <string>
#include "net/third_party/quiche/src/quic/core/crypto/quic_random.h"
#include "net/third_party/quiche/src/quic/core/frames/quic_frame.h"
#include "net/third_party/quiche/src/quic/core/quic_error_codes.h"
#include "net/third_party/quiche/src/quic/core/quic_types.h"
#include "net/third_party/quiche/src/quic/core/quic_versions.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_export.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_iovec.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_socket_address.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_string_piece.h"
#include "net/third_party/quiche/src/quic/platform/api/quic_uint128.h"
namespace quic {
class QUIC_EXPORT_PRIVATE QuicUtils {
public:
QuicUtils() = delete;
// Returns the 64 bit FNV1a hash of the data. See
// http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-param
static uint64_t FNV1a_64_Hash(QuicStringPiece data);
// Returns the 128 bit FNV1a hash of the data. See
// http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-param
static QuicUint128 FNV1a_128_Hash(QuicStringPiece data);
// Returns the 128 bit FNV1a hash of the two sequences of data. See
// http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-param
static QuicUint128 FNV1a_128_Hash_Two(QuicStringPiece data1,
QuicStringPiece data2);
// Returns the 128 bit FNV1a hash of the three sequences of data. See
// http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-param
static QuicUint128 FNV1a_128_Hash_Three(QuicStringPiece data1,
QuicStringPiece data2,
QuicStringPiece data3);
// SerializeUint128 writes the first 96 bits of |v| in little-endian form
// to |out|.
static void SerializeUint128Short(QuicUint128 v, uint8_t* out);
// 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);
// Returns AddressChangeType as a string.
static std::string AddressChangeTypeToString(AddressChangeType type);
// Returns SentPacketState as a char*.
static const char* SentPacketStateToString(SentPacketState state);
// Returns QuicLongHeaderType as a char*.
static const char* QuicLongHeaderTypetoString(QuicLongHeaderType type);
// Returns AckResult as a char*.
static const char* AckResultToString(AckResult result);
// Determines and returns change type of address change from |old_address| to
// |new_address|.
static AddressChangeType DetermineAddressChangeType(
const QuicSocketAddress& old_address,
const QuicSocketAddress& new_address);
// Copies |buffer_length| bytes from iov starting at offset |iov_offset| into
// buffer. |iov| must be at least iov_offset+length total length and buffer
// must be at least |length| long.
static void CopyToBuffer(const struct iovec* iov,
int iov_count,
size_t iov_offset,
size_t buffer_length,
char* buffer);
// Creates an iovec pointing to the same data as |data|.
static struct iovec MakeIovec(QuicStringPiece data);
// Returns true if a packet is ackable. A packet is unackable if it can never
// be acked. Occurs when a packet is never sent, after it is acknowledged
// once, or if it's a crypto packet we never expect to receive an ack for.
static bool IsAckable(SentPacketState state);
// Returns true if frame with |type| is retransmittable. A retransmittable
// frame should be retransmitted if it is detected as lost.
static bool IsRetransmittableFrame(QuicFrameType type);
// Returns true if |frame| is a handshake frame in version |version|.
static bool IsHandshakeFrame(const QuicFrame& frame,
QuicTransportVersion transport_version);
// Returns packet state corresponding to |retransmission_type|.
static SentPacketState RetransmissionTypeToPacketState(
TransmissionType retransmission_type);
// Returns true if header with |first_byte| is considered as an IETF QUIC
// packet header.
static bool IsIetfPacketHeader(uint8_t first_byte);
// Returns true if header with |first_byte| is considered as an IETF QUIC
// short packet header.
static bool IsIetfPacketShortHeader(uint8_t first_byte);
// Returns ID to denote an invalid stream of |version|.
static QuicStreamId GetInvalidStreamId(QuicTransportVersion version);
// Returns crypto stream ID of |version|.
static QuicStreamId GetCryptoStreamId(QuicTransportVersion version);
// Returns whether |id| is the stream ID for the crypto stream. If |version|
// is a version where crypto data doesn't go over stream frames, this function
// will always return false.
static bool IsCryptoStreamId(QuicTransportVersion version, QuicStreamId id);
// Returns headers stream ID of |version|.
static QuicStreamId GetHeadersStreamId(QuicTransportVersion version);
// Returns true if |id| is considered as client initiated stream ID.
static bool IsClientInitiatedStreamId(QuicTransportVersion version,
QuicStreamId id);
// Returns true if |id| is considered as server initiated stream ID.
static bool IsServerInitiatedStreamId(QuicTransportVersion version,
QuicStreamId id);
// Returns true if |id| is considered as bidirectional stream ID. Only used in
// v99.
static bool IsBidirectionalStreamId(QuicStreamId id);
// Returns stream type. Either |perspective| or |peer_initiated| would be
// enough together with |id|. This method enforces that the three parameters
// are consistent. Only used in v99.
static StreamType GetStreamType(QuicStreamId id,
Perspective perspective,
bool peer_initiated);
// Returns the delta between consecutive stream IDs of the same type.
static QuicStreamId StreamIdDelta(QuicTransportVersion version);
// Returns the first initiated bidirectional stream ID of |perspective|.
static QuicStreamId GetFirstBidirectionalStreamId(
QuicTransportVersion version,
Perspective perspective);
// Returns the first initiated unidirectional stream ID of |perspective|.
static QuicStreamId GetFirstUnidirectionalStreamId(
QuicTransportVersion version,
Perspective perspective);
// Generates a random 64bit connection ID.
static QuicConnectionId CreateRandomConnectionId();
// Generates a random 64bit connection ID using the provided QuicRandom.
static QuicConnectionId CreateRandomConnectionId(QuicRandom* random);
// Generates a random connection ID of the given length.
static QuicConnectionId CreateRandomConnectionId(
uint8_t connection_id_length);
// Generates a random connection ID of the given length using the provided
// QuicRandom.
static QuicConnectionId CreateRandomConnectionId(uint8_t connection_id_length,
QuicRandom* random);
// Returns true if the QUIC version allows variable length connection IDs.
static bool VariableLengthConnectionIdAllowedForVersion(
QuicTransportVersion version);
// Returns true if the connection ID is valid for this QUIC version.
static bool IsConnectionIdValidForVersion(QuicConnectionId connection_id,
QuicTransportVersion version);
// Returns a connection ID suitable for QUIC use-cases that do not need the
// connection ID for multiplexing. If the version allows variable lengths,
// a connection of length zero is returned, otherwise 64bits set to zero.
static QuicConnectionId CreateZeroConnectionId(QuicTransportVersion version);
// Generates a 128bit stateless reset token based on a connection ID.
static QuicUint128 GenerateStatelessResetToken(
QuicConnectionId connection_id);
// Determines packet number space from |encryption_level|.
static PacketNumberSpace GetPacketNumberSpace(
EncryptionLevel encryption_level);
// Determines encryption level to send packets in |packet_number_space|.
static EncryptionLevel GetEncryptionLevel(
PacketNumberSpace packet_number_space);
// Get the maximum value for a V99/IETF QUIC stream count. If a count
// exceeds this value, it will result in a stream ID that exceeds the
// implementation limit on stream ID size.
static QuicStreamCount GetMaxStreamCount(bool unidirectional,
Perspective perspective);
};
} // namespace quic
#endif // QUICHE_QUIC_CORE_QUIC_UTILS_H_