2V1-a: port the EterLib network layer and the Crypto++ packet cipher

NetStream/NetAddress/NetDevice/NetPacketHeaderMap and EterBase/cipher.cpp
are mechanical copies. The winsock shim maps Winsock onto BSD sockets and
keeps the Winsock semantics CNetworkStream relies on: select ignores nfds,
a socket whose connect failed is not writable (40250 times out instead),
EINPROGRESS reads as WSAEWOULDBLOCK, and SIGPIPE is ignored.

port.net covers loopback connect, send/recv, peer close, the refused
connect timeout and the client/server key agreement.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

extension/src/port/EterLib/NetAddress.cpp

@@ -0,0 +1,107 @@
+#include "StdAfx.h"
+#include "NetAddress.h"
+
+#ifndef VC_EXTRALEAN
+
+bool CNetworkAddress::GetHostName(char* szName, int size)
+{
+	if (gethostname(szName, size)==SOCKET_ERROR)
+		return false;
+	return true;
+}
+
+CNetworkAddress::CNetworkAddress()
+{
+	Clear();
+}
+
+CNetworkAddress::~CNetworkAddress()
+{
+}
+
+CNetworkAddress::operator const SOCKADDR_IN&() const
+{
+	return m_sockAddrIn;
+}
+
+void CNetworkAddress::Clear()
+{
+	memset(&m_sockAddrIn, 0, sizeof(m_sockAddrIn));
+	m_sockAddrIn.sin_family=AF_INET;
+}
+
+bool CNetworkAddress::IsIP(const char* c_szAddr)
+{
+	if (c_szAddr[0]<'0' || c_szAddr[0]>'9')
+		return false;
+	return true;
+}
+
+bool CNetworkAddress::Set(const char* c_szAddr, int port)
+{
+	if (IsIP(c_szAddr))
+	{
+		SetIP(c_szAddr);
+	}
+	else
+	{
+		if (!SetDNS(c_szAddr))
+			return false;
+	}
+
+	SetPort(port);
+	return true;
+}
+
+void CNetworkAddress::SetLocalIP()
+{
+	SetIP(INADDR_ANY);	
+}
+
+void CNetworkAddress::SetIP(DWORD ip)
+{
+	m_sockAddrIn.sin_addr.s_addr=htonl(ip);
+}
+
+void CNetworkAddress::SetIP(const char* c_szIP)
+{
+	m_sockAddrIn.sin_addr.s_addr=inet_addr(c_szIP);
+}
+
+bool CNetworkAddress::SetDNS(const char* c_szDNS)
+{
+	HOSTENT* pHostent=gethostbyname(c_szDNS);
+	if (!pHostent) return false;
+	memcpy(&m_sockAddrIn.sin_addr, pHostent->h_addr, sizeof(m_sockAddrIn.sin_addr));
+	return true;
+}
+
+void CNetworkAddress::SetPort(int port)
+{
+	m_sockAddrIn.sin_port = htons(port);
+}
+
+int CNetworkAddress::GetSize()
+{
+	return sizeof(m_sockAddrIn);
+}
+
+DWORD CNetworkAddress::GetIP()
+{
+	return ntohl(m_sockAddrIn.sin_addr.s_addr);
+}
+
+void CNetworkAddress::GetIP(char* szIP, int len)
+{
+	BYTE IPs[4];
+	*((DWORD*)IPs)=m_sockAddrIn.sin_addr.s_addr;
+
+	_snprintf(szIP, len, "%d.%d.%d.%d", IPs[0], IPs[1], IPs[2], IPs[3]);
+}
+			
+int CNetworkAddress::GetPort()
+{
+	return ntohs(m_sockAddrIn.sin_port);
+}
+
+#endif

extension/src/port/EterLib/NetDevice.cpp

@@ -0,0 +1,41 @@
+#include "StdAfx.h"
+#include "NetDevice.h"
+
+CNetworkDevice::CNetworkDevice()
+{
+	Initialize();
+}
+
+CNetworkDevice::~CNetworkDevice()
+{
+	Destroy();	
+}
+
+void CNetworkDevice::Initialize()
+{
+	m_isWSA=false;
+}
+
+void CNetworkDevice::Destroy()
+{
+	if (m_isWSA)
+	{
+		WSACleanup();
+		m_isWSA=false;
+	}
+}
+
+bool CNetworkDevice::Create()
+{
+	Destroy();
+
+	Initialize();
+
+	WSADATA wsaData;
+	if (WSAStartup(MAKEWORD(1, 1), &wsaData)!=0)
+		return false;
+
+	m_isWSA=true;
+	
+	return true;
+}

extension/src/port/EterLib/NetPacketHeaderMap.cpp

@@ -0,0 +1,26 @@
+#include "StdAfx.h"
+#include "NetPacketHeaderMap.h"
+
+void CNetworkPacketHeaderMap::Set(int header, TPacketType rPacketType)
+{
+	m_headerMap[header] = rPacketType;
+}
+bool CNetworkPacketHeaderMap::Get(int header, TPacketType * pPacketType)
+{
+	std::map<int, TPacketType>::iterator f=m_headerMap.find(header);
+	
+	if (m_headerMap.end()==f)
+		return false;
+	
+	*pPacketType = f->second;
+
+	return true;
+}
+
+CNetworkPacketHeaderMap::CNetworkPacketHeaderMap()
+{
+}
+
+CNetworkPacketHeaderMap::~CNetworkPacketHeaderMap()
+{
+}