#pragma once

#include "DeprecationUtils.h"

#include "TextBasedProtocol.h"

#include <string>

#include <exception>

/// @file

/// @namespace pcpp

/// @brief The main namespace for the PcapPlusPlus lib

namespace pcpp

{

  /// An enum for HTTP version

  enum HttpVersion

  {

    /// HTTP/0.9

    ZeroDotNine,

    /// HTTP/1.0

    OneDotZero,

    /// HTTP/1.1

    OneDotOne,

    /// Unknown HTTP version

    HttpVersionUnknown

  };

  // some popular HTTP fields

  /// Host field

#define PCPP_HTTP_HOST_FIELD "Host"

  /// Connection field

#define PCPP_HTTP_CONNECTION_FIELD "Connection"

  /// User-Agent field

#define PCPP_HTTP_USER_AGENT_FIELD "User-Agent"

  /// Referer field

#define PCPP_HTTP_REFERER_FIELD "Referer"

  /// Accept field

#define PCPP_HTTP_ACCEPT_FIELD "Accept"

  /// Accept-Encoding field

#define PCPP_HTTP_ACCEPT_ENCODING_FIELD "Accept-Encoding"

  /// Accept-Language field

#define PCPP_HTTP_ACCEPT_LANGUAGE_FIELD "Accept-Language"

  /// Cookie field

#define PCPP_HTTP_COOKIE_FIELD "Cookie"

  /// Content-Length field

#define PCPP_HTTP_CONTENT_LENGTH_FIELD "Content-Length"

  /// Content-Encoding field

#define PCPP_HTTP_CONTENT_ENCODING_FIELD "Content-Encoding"

  /// Content-Type field

#define PCPP_HTTP_CONTENT_TYPE_FIELD "Content-Type"

  /// Transfer-Encoding field

#define PCPP_HTTP_TRANSFER_ENCODING_FIELD "Transfer-Encoding"

  /// Server field

#define PCPP_HTTP_SERVER_FIELD "Server"

  // -------- classes to be defined later -----------------

  class HttpRequestFirstLine;

  class HttpResponseFirstLine;

  // -------- Class HttpMessage -----------------

  /// @class HttpMessage

  /// Represents a general HTTP message. It's an abstract class and cannot be instantiated. It's inherited by

  /// HttpRequestLayer and HttpResponseLayer

  class HttpMessage : public TextBasedProtocolMessage

  {

  public:

    ~HttpMessage() override = default;

    /// A static method that checks whether the port is considered as HTTP

    /// @param[in] port The port number to be checked

    /// @return True if the port matches those associated with the HTTP protocol

    static bool isHttpPort(uint16_t port)

    {

      return port == 80 || port == 8080;

    }

    // overridden methods

    HeaderField* addField(const std::string& fieldName, const std::string& fieldValue) override;

    HeaderField* addField(const HeaderField& newField) override;

    HeaderField* insertField(HeaderField* prevField, const std::string& fieldName,

                             const std::string& fieldValue) override;

    HeaderField* insertField(HeaderField* prevField, const HeaderField& newField) override;

    OsiModelLayer getOsiModelLayer() const override

    {

      return OsiModelApplicationLayer;

    }

  protected:

    HttpMessage(uint8_t* data, size_t dataLen, Layer* prevLayer, Packet* packet, ProtocolType protocol)

        : TextBasedProtocolMessage(data, dataLen, prevLayer, packet, protocol)

    {}

    HttpMessage() : TextBasedProtocolMessage()

    {}

    HttpMessage(const HttpMessage& other) : TextBasedProtocolMessage(other)

    {}

    HttpMessage& operator=(const HttpMessage& other)

    {

      TextBasedProtocolMessage::operator=(other);

      return *this;

    }

    // implementation of abstract methods

    char getHeaderFieldNameValueSeparator() const override

    {

      return ':';

    }

    bool spacesAllowedBetweenHeaderFieldNameAndValue() const override

    {

      return true;

    }

  };

  // -------- Class HttpRequestLayer -----------------

  /// @class HttpRequestLayer

  /// Represents an HTTP request header and inherits all basic functionality of HttpMessage and

  /// TextBasedProtocolMessage. The functionality that is added for this class is the HTTP first line concept. An HTTP

  /// request has the following first line: <i>GET /bla/blabla.asp HTTP/1.1</i> Since it's not an "ordinary" HTTP

  /// field, it requires a special treatment and gets a class of it's own: HttpRequestFirstLine. Unlike most L2-4

  /// protocols, an HTTP request header can spread over more than 1 packet. PcapPlusPlus currently doesn't support a

  /// header that is spread over more than 1 packet so in such cases: 1) only the first packet will be parsed as

  /// HttpRequestLayer (the other packets won't be recognized as HttpRequestLayer) and 2) the HTTP header for the

  /// first packet won't be complete (as it continues in the following packets), this why PcapPlusPlus can indicate

  /// that HTTP request header is complete or not(doesn't end with "\r\n\r\n" or "\n\n") using

  /// HttpMessage#isHeaderComplete()

  class HttpRequestLayer : public HttpMessage

  {

    friend class HttpRequestFirstLine;

  public:

    /// HTTP request methods

    enum HttpMethod

    {

      /// GET

      HttpGET,

      /// HEAD

      HttpHEAD,

      /// POST

      HttpPOST,

      /// PUT

      HttpPUT,

      /// DELETE

      HttpDELETE,

      /// TRACE

      HttpTRACE,

      /// OPTIONS

      HttpOPTIONS,

      /// CONNECT

      HttpCONNECT,

      /// PATCH

      HttpPATCH,

      /// Unknown HTTP method

      HttpMethodUnknown

    };

    /// A constructor that creates the layer from an existing packet raw data

    /// @param[in] data A pointer to the raw data

    /// @param[in] dataLen Size of the data in bytes

    /// @param[in] prevLayer A pointer to the previous layer

    /// @param[in] packet A pointer to the Packet instance where layer will be stored in

    HttpRequestLayer(uint8_t* data, size_t dataLen, Layer* prevLayer, Packet* packet);

    /// A constructor that allocates a new HTTP request header with only the first line filled. Object will be

    /// created without further fields. The user can then add fields using addField() methods

    /// @param[in] method The HTTP method used in this HTTP request

    /// @param[in] uri The URI of the first line

    /// @param[in] version HTTP version to be used in this request

    HttpRequestLayer(HttpMethod method, const std::string& uri, HttpVersion version);

    ~HttpRequestLayer() override;

    /// A copy constructor for this layer. This copy constructor inherits base copy constructor

    /// HttpMessage#HttpMessage() and add the functionality of copying the first line as well

    /// @param[in] other The instance to copy from

    HttpRequestLayer(const HttpRequestLayer& other);

    /// An assignment operator overload for this layer. This method inherits base assignment operator

    /// HttpMessage#operator=() and add the functionality of copying the first line as well

    /// @param[in] other The instance to copy from

    /// @return A reference to the assignee

    HttpRequestLayer& operator=(const HttpRequestLayer& other);

    /// @return A pointer to the first line instance for this message

    HttpRequestFirstLine* getFirstLine() const

    {

      return m_FirstLine;

    }

    /// The URL is hostname+uri. So given the following URL, for example: "www.cnn.com/main.html", the hostname is

    /// "www.cnn.com" and the URI is "/.main.html". URI and hostname are split to 2 different places inside the HTTP

    /// request packet: URI is in the first line and hostname is in "HOST" field. This methods concatenates the

    /// hostname and URI to the full URL

    /// @return The URL of the HTTP request message

    std::string getUrl() const;

    // implement Layer's abstract methods

    std::string toString() const override;

  private:

    HttpRequestFirstLine* m_FirstLine;

  };

  // -------- Class HttpResponseStatusCode -----------------

  /// @struct HttpResponseStatusCode

  /// @brief The enum wrapper class of HTTP response status codes

  class HttpResponseStatusCode

  {

  public:

    /// @brief Define enum types and the corresponding int values

    enum Value : int

    {

      /// 100 Continue

      Http100Continue = 100,

      /// 101 Switching Protocols

      Http101SwitchingProtocols = 101,

      /// 102 Processing

      Http102Processing = 102,

      /// 103 Early Hints

      Http103EarlyHints = 103,

      /// 104-199 Unassigned

      /// 200 OK

      Http200OK = 200,

      /// 201 Created

      Http201Created = 201,

      /// 202 Accepted

      Http202Accepted = 202,

      /// 203 Non-Authoritative Information

      Http203NonAuthoritativeInformation = 203,

      /// 204 No Content

      Http204NoContent = 204,

      /// 205 Reset Content

      Http205ResetContent = 205,

      /// 206 Partial Content

      Http206PartialContent = 206,

      /// 207 Multi-Status

      Http207MultiStatus = 207,

      /// 208 Already Reported

      Http208AlreadyReported = 208,

      /// 209-225 Unassigned

      /// 226 IM Used

      Http226IMUsed = 226,

      /// 227-299 Unassigned

      /// 300 Multiple Choices

      Http300MultipleChoices = 300,

      /// 301 Moved Permanently

      Http301MovedPermanently = 301,

      /// 302 (various messages)

      Http302 = 302,

      /// 303 See Other

      Http303SeeOther = 303,

      /// 304 Not Modified

      Http304NotModified = 304,

      /// 305 Use Proxy

      Http305UseProxy = 305,

      /// 306 Switch Proxy

      Http306SwitchProxy = 306,

      /// 307 Temporary Redirect

      Http307TemporaryRedirect = 307,

      /// 308 Permanent Redirect,

      Http308PermanentRedirect = 308,

      /// 309-399 Unassigned

      /// 400 Bad Request

      Http400BadRequest = 400,

      /// 401 Unauthorized

      Http401Unauthorized = 401,

      /// 402 Payment Required

      Http402PaymentRequired = 402,

      /// 403 Forbidden

      Http403Forbidden = 403,

      /// 404 Not Found

      Http404NotFound = 404,

      /// 405 Method Not Allowed

      Http405MethodNotAllowed = 405,

      /// 406 Not Acceptable

      Http406NotAcceptable = 406,

      /// 407 Proxy Authentication Required

      Http407ProxyAuthenticationRequired = 407,

      /// 408 Request Timeout

      Http408RequestTimeout = 408,

      /// 409 Conflict

      Http409Conflict = 409,

      /// 410 Gone

      Http410Gone = 410,

      /// 411 Length Required

      Http411LengthRequired = 411,

      /// 412 Precondition Failed

      Http412PreconditionFailed = 412,

      /// 413 RequestEntity Too Large

      Http413RequestEntityTooLarge = 413,

      /// 414 Request-URI Too Long

      Http414RequestURITooLong = 414,

      /// 415 Unsupported Media Type

      Http415UnsupportedMediaType = 415,

      /// 416 Requested Range Not Satisfiable

      Http416RequestedRangeNotSatisfiable = 416,

      /// 417 Expectation Failed

      Http417ExpectationFailed = 417,

      /// 418 I'm a teapot

      Http418ImATeapot = 418,

      /// 419 Authentication Timeout

      Http419AuthenticationTimeout = 419,

      /// 420 (various messages)

      Http420 = 420,

      /// 421 Misdirected Request

      Http421MisdirectedRequest = 421,

      /// 422 Unprocessable Entity

      Http422UnprocessableEntity = 422,

      /// 423 Locked

      Http423Locked = 423,

      /// 424 Failed Dependency

      Http424FailedDependency = 424,

      /// 425 Too Early

      Http425TooEarly = 425,

      /// 426 Upgrade Required

      Http426UpgradeRequired = 426,

      /// 427 Unassigned

      /// 428 Precondition Required

      Http428PreconditionRequired = 428,

      /// 429 Too Many Requests

      Http429TooManyRequests = 429,

      /// 430 Unassigned

      /// 431 Request Header Fields Too Large

      Http431RequestHeaderFieldsTooLarge = 431,

      /// 432-439 unassigned

      /// 440 Login Timeout

      Http440LoginTimeout = 440,

      /// 441-443 unassigned

      /// 444 No Response

      Http444NoResponse = 444,

      /// 445-448 unassigned

      /// 449 Retry With

      Http449RetryWith = 449,

      /// 450 Blocked by Windows Parental Controls

      Http450BlockedByWindowsParentalControls = 450,

      /// 451 (various messages)

      Http451 = 451,

      /// 452-493 unassigned

      /// 494 Request Header Too Large

      Http494RequestHeaderTooLarge = 494,

      /// 495 Cert Error

      Http495CertError = 495,

      /// 496 No Cert

      Http496NoCert = 496,

      /// 497 HTTP to HTTPS

      Http497HTTPtoHTTPS = 497,

      /// 498 Token expired/invalid

      Http498TokenExpiredInvalid = 498,

      /// 499 (various messages)

      Http499 = 499,

      /// 500 Internal Server Error

      Http500InternalServerError = 500,

      /// 501 Not Implemented

      Http501NotImplemented = 501,

      /// 502 Bad Gateway

      Http502BadGateway = 502,

      /// 503 Service Unavailable

      Http503ServiceUnavailable = 503,

      /// 504 Gateway Timeout

      Http504GatewayTimeout = 504,

      /// 505 HTTP Version Not Supported

      Http505HTTPVersionNotSupported = 505,

      /// 506 Variant Also Negotiates

      Http506VariantAlsoNegotiates = 506,

      /// 507 Insufficient Storage

      Http507InsufficientStorage = 507,

      /// 508 Loop Detected

      Http508LoopDetected = 508,

      /// 509 Bandwidth Limit Exceeded

      Http509BandwidthLimitExceeded = 509,

      /// 510 Not Extended

      Http510NotExtended = 510,

      /// 511 Network Authentication Required

      Http511NetworkAuthenticationRequired = 511,

      /// 512-519 unassigned

      /// 520 Origin Error

      Http520OriginError = 520,

      /// 521 Web server is down

      Http521WebServerIsDown = 521,

      /// 522 Connection timed out

      Http522ConnectionTimedOut = 522,

      /// 523 Proxy Declined Request

      Http523ProxyDeclinedRequest = 523,

      /// 524 A timeout occurred

      Http524aTimeoutOccurred = 524,

      /// 525-597 unassigned

      /// 598 Network read timeout error

      Http598NetworkReadTimeoutError = 598,

      /// 599 Network connect timeout error

      Http599NetworkConnectTimeoutError = 599,

      // clang-format off

      /// Unknown status code

      HttpStatus1xxCodeUnknown = 900001, // 1xx: Informational - Request received, continuing process

      HttpStatus2xxCodeUnknown = 900002, // 2xx: Success - The action was successfully received, understood, and accepted

      HttpStatus3xxCodeUnknown = 900003, // 3xx: Redirection - Further action must be taken in order to complete the request

      HttpStatus4xxCodeUnknown = 900004, // 4xx: Client Error - The request contains bad syntax or cannot be fulfilled

      HttpStatus5xxCodeUnknown = 900005, // 5xx: Server Error - The server failed to fulfill an apparently valid request

      HttpStatusCodeUnknown = 999999,    // other arbitrary number

      // clang-format on

    };

    HttpResponseStatusCode() = default;

    // cppcheck-suppress noExplicitConstructor

    /// @brief Construct HttpResponseStatusCode from Value enum

    /// @param[in] statusCode the status code enum

    HttpResponseStatusCode(Value statusCode) : m_Value(statusCode)

    {}

    /// @brief Construct HttpResponseStatusCode from the code number and the customized message

    /// @param[in] statusCodeNumber the status code in number, e.g. 200, 404

    /// @param[in] statusMessage the status message, optional, leave empty to use a default message

    explicit HttpResponseStatusCode(const int& statusCodeNumber, const std::string& statusMessage = "");

    /// @brief Construct HttpResponseStatusCode from Value enum and the customized message

    /// @param[in] statusCode the status code enum

    /// @param[in] statusMessage the customized status message, optional

    explicit HttpResponseStatusCode(const Value& statusCode, const std::string& statusMessage);

    // Allow switch and comparisons.

    operator Value() const

    {

      return m_Value;

    }

    // Prevent usage: if(httpResponseStatusCode)

    explicit operator bool() const = delete;

    /// @brief get status code number as string

    std::string toString() const

    {

      return std::to_string(m_Value);

    }

    /// @brief get status code number as int

    int toInt() const

    {

      return static_cast<int>(m_Value);

    }

    /// @brief get status code message, e.g. "OK", "Not Found"

    std::string getMessage() const;

    /// @return If this HttpResponseStatusCode a valid code

    /// @note Any unknown or error code has an extreme large enum value

    bool isUnsupportedCode() const

    {

      return m_Value > 599;

    }

  private:

    Value m_Value = HttpStatusCodeUnknown;

    std::string m_CustomizedMessage;

  };

  // -------- Class HttpResponseLayer -----------------

  /// @class HttpResponseLayer

  /// Represents an HTTP response header and inherits all basic functionality of HttpMessage and

  /// TextBasedProtocolMessage. The functionality that is added for this class is the HTTP first line concept. An HTTP

  /// response has the following first line: <i>200 OK HTTP/1.1</i> Since it's not an "ordinary" HTTP field, it

  /// requires a special treatment and gets a class of it's own: HttpResponseFirstLine. Unlike most L2-4 protocols, an

  /// HTTP response header can spread over more than 1 packet. PcapPlusPlus currently doesn't support a header that is

  /// spread over more than 1 packet so in such cases: 1) only the first packet will be parsed as HttpResponseLayer

  /// (the other packets won't be recognized as HttpResponseLayer) and 2) the HTTP header for the first packet won't

  /// be complete (as it continues in the following packets), this why PcapPlusPlus can indicate that HTTP response

  /// header is complete or not (doesn't end with "\r\n\r\n" or "\n\n") using HttpMessage#isHeaderComplete()

  class HttpResponseLayer : public HttpMessage

  {

    friend class HttpResponseFirstLine;

  public:

    // backward compatibility

    using HttpResponseStatusCode = pcpp::HttpResponseStatusCode;

    /// A constructor that creates the layer from an existing packet raw data

    /// @param[in] data A pointer to the raw data

    /// @param[in] dataLen Size of the data in bytes

    /// @param[in] prevLayer A pointer to the previous layer

    /// @param[in] packet A pointer to the Packet instance where layer will be stored in

    HttpResponseLayer(uint8_t* data, size_t dataLen, Layer* prevLayer, Packet* packet);

    /// A constructor that allocates a new HTTP response header with only the first line filled. Object will be

    /// created without further fields. The user can then add fields using addField() methods

    /// @param[in] version HTTP version to be used

    /// @param[in] statusCode Status code to be used

    /// @param[in] statusCodeString Most status codes have their default string, e.g 200 is usually "OK", 404 is

    /// usually "Not Found", etc. But the user can set a non-default status code string and it will be written in

    /// the header first line. Empty string ("") means using the default status code string

    /// @deprecated Use other constructors instead.

    PCPP_DEPRECATED("Use other constructors instead")

    explicit HttpResponseLayer(HttpVersion version, const HttpResponseStatusCode& statusCode,

                               const std::string& statusCodeString);

    /// A constructor that allocates a new HTTP response header with only the first line filled. Object will be

    /// created without further fields. The user can then add fields using addField() methods

    /// @param[in] version HTTP version to be used

    /// @param[in] statusCode Status code to be used

    explicit HttpResponseLayer(HttpVersion version, const HttpResponseStatusCode& statusCode);

    ~HttpResponseLayer() override;

    /// A copy constructor for this layer. This copy constructor inherits base copy constructor

    /// HttpMessage#HttpMessage() and adds the functionality of copying the first line as well

    /// @param[in] other The instance to copy from

    HttpResponseLayer(const HttpResponseLayer& other);

    /// An assignment operator overload for this layer. This method inherits base assignment operator

    /// HttpMessage#operator=() and adds the functionality of copying the first line as well

    /// @param[in] other The instance to copy from

    /// @return A reference to the assignee

    HttpResponseLayer& operator=(const HttpResponseLayer& other);

    /// @return A pointer to the first line instance for this message

    HttpResponseFirstLine* getFirstLine() const

    {

      return m_FirstLine;

    }

    /// The length of the body of many HTTP response messages is determined by a HTTP header field called

    /// "Content-Length". This method sets The content-length field value. The method supports several cases:

    ///   - If the "Content-Length" field exists - the method will only replace the existing value with the new

    ///   value

    ///   - If the "Content-Length" field doesn't exist - the method will create this field and put the value in it.

    /// Here are also 2 cases:

    ///   - If prevFieldName is specified - the new "Content-Length" field will be created after it

    ///   - If prevFieldName isn't specified or doesn't exist - the new "Content-Length" field will be created as

    ///   the last field before end-of-header field

    ///

    /// @param[in] contentLength The content length value to set

    /// @param[in] prevFieldName Optional field, if specified and "Content-Length" field doesn't exist, it will be

    /// created after it

    /// @return A pointer to the "Content-Length" field, or nullptr if creation failed for some reason

    HeaderField* setContentLength(int contentLength, const std::string& prevFieldName = "");

    /// The length of the body of many HTTP response messages is determined by a HTTP header field called

    /// "Content-Length". This method parses this field, extracts its value and return it. If this field doesn't

    /// exist the method will return 0

    /// @return HTTP response body length determined by "Content-Length" field

    int getContentLength() const;

    // implement Layer's abstract methods

    std::string toString() const override;

  private:

    HttpResponseFirstLine* m_FirstLine;

  };

  // -------- Class HttpRequestFirstLine -----------------

  /// @class HttpRequestFirstLine

  /// Represents an HTTP request header first line. The first line includes 3 parameters: HTTP method (e.g GET, POST,

  /// etc.), URI (e.g /main/index.html) and HTTP version (e.g HTTP/1.1). All these parameters are included in this

  /// class, and the user can retrieve or set them. This class cannot be instantiated by users, it's created inside

  /// HttpRequestLayer and user can get a pointer to an instance of it. All "get" methods of this class will retrieve

  /// the actual data of the HTTP request and the "set" methods will change the packet data. Since HTTP is a textual

  /// protocol, most fields aren't of fixed size and this also applies to the first line parameters. So most "set"

  /// methods of this class need in most cases to shorten or extend the data in HttpRequestLayer. These methods will

  /// return a false value if this action failed

  class HttpRequestFirstLine

  {

    friend class HttpRequestLayer;

  public:

    /// @return The HTTP method

    HttpRequestLayer::HttpMethod getMethod() const

    {

      return m_Method;

    }

    /// Set the HTTP method

    /// @param[in] newMethod The method to set

    /// @return False if newMethod is HttpRequestLayer#HttpMethodUnknown or if shortening/extending the

    /// HttpRequestLayer data failed. True otherwise

    bool setMethod(HttpRequestLayer::HttpMethod newMethod);

    /// @return A copied version of the URI (notice changing the return value won't change the actual data of the

    /// packet)

    std::string getUri() const;

    /// Set the URI

    /// @param[in] newUri The URI to set

    /// @return False if shortening/extending the HttpRequestLayer data failed. True otherwise

    bool setUri(std::string newUri);

    /// @return The HTTP version

    HttpVersion getVersion() const

    {

      return m_Version;

    }

    /// Set the HTTP version. This method doesn't return a value since all supported HTTP versions are of the same

    /// size (HTTP/0.9, HTTP/1.0, HTTP/1.1)

    /// @param[in] newVersion The HTTP version to set

    void setVersion(HttpVersion newVersion);

    /// A static method for parsing the HTTP method out of raw data

    /// @param[in] data The raw data

    /// @param[in] dataLen The raw data length

    /// @return The parsed HTTP method

    static HttpRequestLayer::HttpMethod parseMethod(const char* data, size_t dataLen);

    /// @return The size in bytes of the HTTP first line

    int getSize() const

    {

      return m_FirstLineEndOffset;

    }

    /// As explained in HttpRequestLayer, an HTTP header can spread over more than 1 packet, so when looking at a

    /// single packet the header can be partial. Same goes for the first line - it can spread over more than 1

    /// packet. This method returns an indication whether the first line is partial

    /// @return False if the first line is partial, true if it's complete

    bool isComplete() const

    {

      return m_IsComplete;

    }

    /// @class HttpRequestFirstLineException

    /// This exception can be thrown while constructing HttpRequestFirstLine (the constructor is private, so the

    /// construction happens only in HttpRequestLayer). This kind of exception will be thrown if trying to construct

    /// with HTTP method of HttpRequestLayer#HttpMethodUnknown or with undefined HTTP version ::HttpVersionUnknown

    class HttpRequestFirstLineException : public std::exception

    {

    public:

      ~HttpRequestFirstLineException() noexcept

      {}

      void setMessage(const std::string& message)

      {

        m_Message = message;

      }

      virtual const char* what() const noexcept

      {

        return m_Message.c_str();

      }

    private:

      std::string m_Message;

    };

  private:

    HttpRequestFirstLine(HttpRequestLayer* httpRequest);

    HttpRequestFirstLine(HttpRequestLayer* httpRequest, HttpRequestLayer::HttpMethod method, HttpVersion version,

                         const std::string& uri = "/");

    void parseVersion();

    HttpRequestLayer* m_HttpRequest;

    HttpRequestLayer::HttpMethod m_Method;

    HttpVersion m_Version;

    int m_VersionOffset;

    int m_UriOffset;

    int m_FirstLineEndOffset;

    bool m_IsComplete;

    HttpRequestFirstLineException m_Exception;

  };

  // -------- Class HttpResponseFirstLine -----------------

  /// @class HttpResponseFirstLine

  /// Represents an HTTP response header first line. The first line includes 2 parameters: status code (e.g 200 OK,

  /// 404 Not Found, etc.), and HTTP version (e.g HTTP/1.1). These 2 parameters are included in this class, and the

  /// user can retrieve or set them. This class cannot be instantiated by users, it's created inside HttpResponseLayer

  /// and user can get a pointer to an instance of it. The "get" methods of this class will retrieve the actual data

  /// of the HTTP response and the "set" methods will change the packet data. Since HTTP is a textual protocol, most

  /// fields aren't of fixed size and this also applies to the first line parameters. So most "set" methods of this

  /// class need in most cases to shorten or extend the data in HttpResponseLayer. These methods will return a false

  /// value if this action failed

  class HttpResponseFirstLine

  {

    friend class HttpResponseLayer;

  public:

    /// @return The status code as HttpResponseStatusCode enum

    HttpResponseStatusCode getStatusCode() const

    {

      return m_StatusCode;

    }

    /// @return The status code number as integer (e.g 200, 404, etc.)

    int getStatusCodeAsInt() const;

    /// @return The status code message (e.g "OK", "Not Found", etc.)

    std::string getStatusCodeString() const;

    /// Set the status code

    /// @param[in] newStatusCode The new status code to set

    /// @param[in] statusCodeString An optional parameter: set a non-default status code message (e.g "Bla Bla"

    /// instead of "Not Found"). If this parameter isn't supplied or supplied as empty string (""), the default

    /// message for the status code will be set

    /// @return True if setting the status code was completed successfully, false otherwise

    /// @deprecated Use the other overload instead.

    PCPP_DEPRECATED("Use the other overload instead")

    bool setStatusCode(const HttpResponseStatusCode& newStatusCode, const std::string& statusCodeString);

    /// Set the status code

    /// @param[in] newStatusCode The new status code to set

    /// @return True if setting the status code was completed successfully, false otherwise

    bool setStatusCode(const HttpResponseStatusCode& newStatusCode);

    /// @return The HTTP version

    HttpVersion getVersion() const

    {

      return m_Version;

    }

    /// Set the HTTP version. This method doesn't return a value since all supported HTTP versions are of the same

    /// size (HTTP/0.9, HTTP/1.0, HTTP/1.1)

    /// @param[in] newVersion The HTTP version to set

    void setVersion(HttpVersion newVersion);

    /// A static method for parsing the HTTP status code out of raw data

    /// @param[in] data The raw data

    /// @param[in] dataLen The raw data length

    /// @return The parsed HTTP status code as enum

    static HttpResponseStatusCode parseStatusCode(const char* data, size_t dataLen);

    /// A static method for parsing the HTTP version out of raw first line data (e.g "HTTP/x.y")

    /// @param[in] data The raw data

    /// @param[in] dataLen The raw data length

    /// @return The parsed HTTP status code as enum

    static HttpVersion parseVersion(const char* data, size_t dataLen);

    /// @return The size in bytes of the HTTP first line

    int getSize() const

    {

      return m_FirstLineEndOffset;

    }

    /// As explained in HttpResponseLayer, an HTTP header can spread over more than 1 packet, so when looking at a

    /// single packet the header can be partial. Same goes for the first line - it can spread over more than 1

    /// packet. This method returns an indication whether the first line is partial

    /// @return False if the first line is partial, true if it's complete

    bool isComplete() const

    {

      return m_IsComplete;

    }

    /// @class HttpResponseFirstLineException

    /// This exception can be thrown while constructing HttpResponseFirstLine (the constructor is private, so the

    /// construction happens only in HttpResponseLayer). This kind of exception will be thrown if trying to

    /// construct with a HTTP status code that is not in HttpResponseStatusCode or with undefined HTTP version

    /// ::HttpVersionUnknown

    class HttpResponseFirstLineException : public std::exception

    {

    public:

      ~HttpResponseFirstLineException() noexcept

      {}

      void setMessage(const std::string& message)

      {

        m_Message = message;

      }

      virtual const char* what() const noexcept

      {

        return m_Message.c_str();

      }

    private:

      std::string m_Message;

    };

  private:

    HttpResponseFirstLine(HttpResponseLayer* httpResponse);

    HttpResponseFirstLine(HttpResponseLayer* httpResponse, HttpVersion version,

                          const HttpResponseStatusCode& statusCode);

    HttpResponseLayer* m_HttpResponse;

    HttpVersion m_Version;

    HttpResponseStatusCode m_StatusCode;

    int m_FirstLineEndOffset;

    bool m_IsComplete;

    HttpResponseFirstLineException m_Exception;

  };

}  // namespace pcpp